CA1108722A - Process for the uniform dyeing of textile material webs with the aid of a uniform pre-drying - Google Patents
Process for the uniform dyeing of textile material webs with the aid of a uniform pre-dryingInfo
- Publication number
- CA1108722A CA1108722A CA292,758A CA292758A CA1108722A CA 1108722 A CA1108722 A CA 1108722A CA 292758 A CA292758 A CA 292758A CA 1108722 A CA1108722 A CA 1108722A
- Authority
- CA
- Canada
- Prior art keywords
- drying
- measuring
- textile material
- drying tunnel
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C2700/00—Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
- D06C2700/09—Various apparatus for drying textiles
Abstract
PROCESS FOR THE UNIFORM DYEING OF TEXTILE MATERIAL WEBS WITH
THE AID OF A UNIFORM PRE-DRYING
Abstract of the disclosure:
Process for the uniform pre-drying of damp textile material webs, subsequent to a continuous wet treatment operation, with the aid of a measure-ment of the moisture content remaining on the textile material, wherein, in the course of the material run, immediately behind an infrared pre-drying tunnel for the continuously fed material, several measuring positions are arranged transversely to the transport direction of the material, and measurements of the residual moisture are made by means of a contactless method, the measuring pulses determined in this manner are transmitted to the control elements of the preceding pre-dryer and there the heating power of several separately controllable heating fields, distributed across the width of the drying tunnel, is controlled in agreement with the measured values of the moisture.
THE AID OF A UNIFORM PRE-DRYING
Abstract of the disclosure:
Process for the uniform pre-drying of damp textile material webs, subsequent to a continuous wet treatment operation, with the aid of a measure-ment of the moisture content remaining on the textile material, wherein, in the course of the material run, immediately behind an infrared pre-drying tunnel for the continuously fed material, several measuring positions are arranged transversely to the transport direction of the material, and measurements of the residual moisture are made by means of a contactless method, the measuring pulses determined in this manner are transmitted to the control elements of the preceding pre-dryer and there the heating power of several separately controllable heating fields, distributed across the width of the drying tunnel, is controlled in agreement with the measured values of the moisture.
Description
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Ihe con-t:inuous dye:ing processes developed after the introduction of synthetic fibe-rs, in whicll processes an intermediate drying of the textile material impregnated with the dyes is necessary before the fixation, have led to the development of pre-drying units, with the help of which the damp textile ma-terial is to be dricd, as far as possible without contact, suffic-iently so that in the subsequent final drying of the material no further migration effects of the dyes can occur. The pre-drying unit used most widely in practice for this purpose is the infrared pre-drying tunnel.
The monitoring of a pre-drying in the infrared tunnel has, however, hitherto always given rise to great difficulties. These arise particularly from the fact that it is not yet possible to check the uniformity of the drying ~.cross the fabric web. As a result of the non-uniformity, ho~ever, the material again suffers, and it can happen that synthetic material undergoes partial setting, changes in the fibres and the like as a res-ult of local over-heating. This all leads to a non-uniform dyeing result. The wicking action of a variably damp material also cannot be ignored, for with a material made of 100% polyester fibers a migration is still possible even below 5% of residual moisture.
The mode of operation with the pre-drying tunnel still causes, even today, great difficulties in textile work and the faults of dyeings produced in this manner, caused by unsatisfactory drying results, can only be partially removed or improved by expensive repair processes and re-dyeing processes.
It has thus not been possible hitherto to measure accurate .
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moisture values across -the whole w:idtll of the material. The pre-drying can also not be controlled across the whole width. Ilowever, for reasons of levelness, the material while still damp must not come into contact with sliding contacts. In addition, the measurement of the residual moisture at a single position is not adequate for -the purpose of a controlled pre-drying.
On the other hand, the appearance of material which has once been unevenly dried in the pre-drying tunnel can, however, no longer be corrected by the subsequent drying and fixation process. Color deviations or markings in the dyed material remain always more o:r less visible. When too damp or too dry material is fed to the final dryer or to the thermosol equipment either the desired drying effect is not achieved, or on the other hand the depth of color obtained is not sufficient on account of different fixation conditions, or in both cases unnecessary power is consumed.
For all these reasons there was an urgent need to be able to determine accurately the residual moisture of pre-dried or intermediately dried material webs, in order to obtain a check in this way on the process taking place on the textile material.
It would be advantageous to have, a process for the uniform pre-drying of damp textile material webs, subsequent to a continuous wet treatment operation in the dyeing or finishing of fiber materials, with the aid of a measurement of the moisture content remaining on the textile material, with which process the difficulties which were discussed above and which are known in the state of the art in this field of work, can be removed.
The present invention provides a process in the dyeing or finishing of a textile material web for the uniform pre-drying of a moist web subsequent to a continuous wet treatment operation by measuring the moisture content remaining in the textile material, wherein several measuring positions are
Ihe con-t:inuous dye:ing processes developed after the introduction of synthetic fibe-rs, in whicll processes an intermediate drying of the textile material impregnated with the dyes is necessary before the fixation, have led to the development of pre-drying units, with the help of which the damp textile ma-terial is to be dricd, as far as possible without contact, suffic-iently so that in the subsequent final drying of the material no further migration effects of the dyes can occur. The pre-drying unit used most widely in practice for this purpose is the infrared pre-drying tunnel.
The monitoring of a pre-drying in the infrared tunnel has, however, hitherto always given rise to great difficulties. These arise particularly from the fact that it is not yet possible to check the uniformity of the drying ~.cross the fabric web. As a result of the non-uniformity, ho~ever, the material again suffers, and it can happen that synthetic material undergoes partial setting, changes in the fibres and the like as a res-ult of local over-heating. This all leads to a non-uniform dyeing result. The wicking action of a variably damp material also cannot be ignored, for with a material made of 100% polyester fibers a migration is still possible even below 5% of residual moisture.
The mode of operation with the pre-drying tunnel still causes, even today, great difficulties in textile work and the faults of dyeings produced in this manner, caused by unsatisfactory drying results, can only be partially removed or improved by expensive repair processes and re-dyeing processes.
It has thus not been possible hitherto to measure accurate .
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moisture values across -the whole w:idtll of the material. The pre-drying can also not be controlled across the whole width. Ilowever, for reasons of levelness, the material while still damp must not come into contact with sliding contacts. In addition, the measurement of the residual moisture at a single position is not adequate for -the purpose of a controlled pre-drying.
On the other hand, the appearance of material which has once been unevenly dried in the pre-drying tunnel can, however, no longer be corrected by the subsequent drying and fixation process. Color deviations or markings in the dyed material remain always more o:r less visible. When too damp or too dry material is fed to the final dryer or to the thermosol equipment either the desired drying effect is not achieved, or on the other hand the depth of color obtained is not sufficient on account of different fixation conditions, or in both cases unnecessary power is consumed.
For all these reasons there was an urgent need to be able to determine accurately the residual moisture of pre-dried or intermediately dried material webs, in order to obtain a check in this way on the process taking place on the textile material.
It would be advantageous to have, a process for the uniform pre-drying of damp textile material webs, subsequent to a continuous wet treatment operation in the dyeing or finishing of fiber materials, with the aid of a measurement of the moisture content remaining on the textile material, with which process the difficulties which were discussed above and which are known in the state of the art in this field of work, can be removed.
The present invention provides a process in the dyeing or finishing of a textile material web for the uniform pre-drying of a moist web subsequent to a continuous wet treatment operation by measuring the moisture content remaining in the textile material, wherein several measuring positions are
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arranged trilnsversely to the t.ranspor-t d:irectioll o:f the material immediatcly behind an infrared pre-dryillg tullnel -for the contilluously :fed material, and durillg the passage o:f the material, ~leasu:rements of the residual moisture content are made at these positions on the textile material by means of a contactless method, the measuring signals thus determined are transmitted with : low inertia, to control elements of the preceding pre-dryer where the heating power of each of several separately controllable heating fields, distributed across the width of said pre-drying tunne:L is controlled in accordance with the measured values so as -to maintain the moisture content at each measurement position at a constant and predetermined :Level.
The present invention also provides a process in the dyeing or finishing of a textile material web for the uniform pre-drying, prior to the complete drying, of a moist web subsequent to a continuous wet treatment operation, said process comprising the steps of continuously measuring, monitoring, and automatically controlling the moisture content remaining in the textile material, said measuring being carried out during the passage of the material through a unit immediately after exit from an infrared pre-drying tunnel for the continuously fed web by means of a contactless method based on microwave absorption, wherein at several measuring positions arranged transversely to the transport direction of the material, existing different values of the residual moisture content at these positions on the textile material at that moment, are continuously determined by means of frequency-modulated micro-waves so as to monitor the same) the measuring values thus determined are transmitted with low impedance to the control elements of the preceding pre-dryer where, while the web is travelling at a constant speed, the heating power of each of several separately controllable heating fields which are distributed across the width of said pre-drying tunnel, is
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arranged trilnsversely to the t.ranspor-t d:irectioll o:f the material immediatcly behind an infrared pre-dryillg tullnel -for the contilluously :fed material, and durillg the passage o:f the material, ~leasu:rements of the residual moisture content are made at these positions on the textile material by means of a contactless method, the measuring signals thus determined are transmitted with : low inertia, to control elements of the preceding pre-dryer where the heating power of each of several separately controllable heating fields, distributed across the width of said pre-drying tunne:L is controlled in accordance with the measured values so as -to maintain the moisture content at each measurement position at a constant and predetermined :Level.
The present invention also provides a process in the dyeing or finishing of a textile material web for the uniform pre-drying, prior to the complete drying, of a moist web subsequent to a continuous wet treatment operation, said process comprising the steps of continuously measuring, monitoring, and automatically controlling the moisture content remaining in the textile material, said measuring being carried out during the passage of the material through a unit immediately after exit from an infrared pre-drying tunnel for the continuously fed web by means of a contactless method based on microwave absorption, wherein at several measuring positions arranged transversely to the transport direction of the material, existing different values of the residual moisture content at these positions on the textile material at that moment, are continuously determined by means of frequency-modulated micro-waves so as to monitor the same) the measuring values thus determined are transmitted with low impedance to the control elements of the preceding pre-dryer where, while the web is travelling at a constant speed, the heating power of each of several separately controllable heating fields which are distributed across the width of said pre-drying tunnel, is
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individually controlled, sai~ controlling being in response to the measured value of the moisture content obtained at the corresponding measuring points.
According to the present invention, the moisture value, determined by the measuring position, is the basis for -the control of the heating power of the pre-dryer. In order to ensure a useful control of the drying operation~
the infrared pre-drying tunnel is sub-divided into at least two, but more advantageously into three or, still better, :Eour fields which in turn are opposite at least two to four measuring positions across the width of the material web, after the pre-dryer. The most certain way is to provide at least 10as many measuring positions, across the width of the material, as there are control possibilities at the drying tunnel.
~ In the claimed process, it is appropriate if the desired residual ; moisture of the fabric (moisture-desired value) is pre-.
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set by being programmed into L limiting value circui-t and in this way a ref-erence system for the residual moisture is provided. According to this novel tecimique, ~rom the f;rst moment of starting up the drying process, the heating power of the pre-drying tunnel increases across the whole width until the residual moisture (moisture-actual value) produced by it and then measured corresponds to this limiting value. During the course of the drying operation, the amount of moisture present at any moment is measured continuously across the width of the material web and, likewise con-tinuously and even almost without delay, it is adjusted to the set limiting value of the moisture, in sucll a manner that the same value of the residual moisture results across the whole width of the material.
According to the process, the control of the heating power of several heating fields is effected automatically across the width of the material, by means of electronic control. With a pre-dryer with its many measuring positions, it will hardly be possible any more to effect manual control when there are at least four controllable heating fields; where there are less than four controllable heating fields, however, the pre-drying cannot be set individually and accurately enough. In addition, the delay at the pre-dryer must be kept as small as possible. With the setting of a desired temperature and ventilation limit, a further reference system is provided by the process claimed, by which the heating power of the pre-drying tunnel is accordingly set. The heating power is increased or decreased according to the speed of the material.
The drying unit employed according to the invention is constructed in such a way that it contains controllable and non-controllable heating fields.
~eyer~ the heating fields wh~ch can be switched on and off, and can be controlled, do not extend across the whole ~idth of the material. They are ~ 4 ~
arranged in sllcll a manner tllat several he.ating fields Oe this type, across the width of tlle material, ccm separately heat a-t the edges and in the center.
Thus, by these means, a fabric is pre-clried in such a way that the same residual moisture is exhibited everywhere, according to whether the left hand or the right hand edge dries more strongly, or the dye on this side migrates more strongly. In general the practice is to leave the base load of the infra-red pre-drying tunnel uncontTolled and to regulate the control load with the aid of the moisture measurement on the textile material The principle of the present invention consists in the immediate, that is to say inertia-less or undelayed, transmission of measured values of the moisture to the control of the heating power of the pre-drying tunnel.
In this process the heating fields themselves, as well as, with appropriate circuitry, each radiator are controlled individually, so that an impeccable matching of the heating power to the fabric surface or to the fabric structure is effected. As mentioned already, the transmission of the measured values is effected without inertia. This means that, f~r example, faulty portions due to differing dye application, can no longer occur.
~n the process according to the invention for the control of the pre-drying, it is possible to distribute not only heating fields across the 2Q area of the width of the material. On the contrary, individual radiator rods with shortened lengths can also be used, arranged across the width of the material. These can be switched on or off individually or in particular series. However, it has been found to be particularly advantageous in this connection that it is not necessary to actually switch the heating sources on and off if the particular power of the radiator is adjusted by control of the current ~supply. Ilowever, to prevent the efects of the temperature radiat-ion from acting "stepwise", lt is advantageous, particularly with lower material ~ 5 ~
speeds, to prodllce a convectional distribution by means of a circulation device. By this means it is now also possible to control the air flow conditions within -the tunnel since the power of the circulation device is also controllecl by the moisture measurement. A further control possibility is the amount of the fresh air swcked in.
According to the claimed mode of operation, the contactless moisture measurement of the textile material and the control of the controllable heating fields with low inertia can be effected with the aid of a measuring method based on microwave absorption or microwave reflectlon, or on the basis of infrared absorption or infrared reflection. In this connection use may advantageously be made according to the invention of the subject of German Utility Model. (HOE 76/F 296G). This concerns a device for the simul-; taneous determination of the moisture content at the si~des and in the center of textile webs, with which device the amount of liquor applied to sheet-like structures can be measured, even in the range of high moisture and which consists of microwave transmitters ~horn tTansmitters) distributed across the width of the material web and connected to a microwave oscillator, and approp-riately arranged microwave receivers. The measuring principle of the equipment which operates by microwave absorption and which has the purpose of determining the influence on the microwave power which passes from the transmitters through the material web to the receivers~ is used to control the pre-dryer. The measuring equipment can be provided with as many horn transmitters and receivers as there are control possibilities existing on the pre-dryer. The measuTement of the residual moisture is effected across the width of the material web immediately behind the pre-drying tunnel. The indication of the measuxed value is~effected without delay and gives a control pulse in the mV range, which is employed for the setting of the heating power of the pre-~ 6 t~'7~;~
dryer. T}le accuracy o~ the measurement lies betwecn O.S and 3%. By modulation of the microwave :frequcncy of the osc:illator (Eor example 2.~ to 3.7 cm wave-length), a time-conswning adjustment of the equipment is dispensed with, and the posit:ion of the material web as well as the fluttering of the latter during the measurement no longer have any effect.
Compared with a measuring method which has already been introduced in practice, and which operates with the aid of a reflected microwave beam and which possesses only a single measur:ing position which traverses to and fro in a zig-zag manner across the material, the device described here has the advantage that it possesses at least three horn transmitters across the width of the material web with appropriately located receivers. With a traversing guidance of the measuring head there is not only a great tendency for faults in the equipment, but the corrections are, in addition, much too time-consuming.
Moreover, in this traversing measurement, the running of the material adversely affects the measured results.
~ Compared with the hitherto customary methods for controlling the : residual moisture content, a whole series of advantages which characterize the new technique can be achieved with the aid of the process according to the invention:
As already mentioned above, the new mode of operation results in a much lower loss of material due to uneven d-rying, in contrast to the hitherto empirical settings for the desired residual moisture and for a uniform moisture across the width of the material.
A changeover can be made, during the material run, without particular difficulty, to the pre-drying of a different textile grade, thus also permitting the use of smaller yardages. The organization in a works is therefore much more flexible. A much more even dyeing is obtained across the width of the material ~ 7 .~ ~
7 2~
web.
The residual moistwre can be se-t with impeccable reproducibility across the textile web. 'I'his is possible at any time even if the same grades of material are run at intervals Oe weeks or even months. The moisture measurement without inertia permits, ot' course, the immediate setting of the material speed, for example to a different material grade.
According to the invention, a uniform pre-drying to the desired residual moisture value can be effected even with textile webs which have received a variable wettability across the width as a result of the pre-treatment.
Different fixation conditions for non-uniform material surfaces are dispensed with.
It is also possible without difficulty, according to the new process, to influence the heating power of gas burners3 installed in the pre-drying tunnel, for example, by throttling the gas supply by a means using the results of the moisture measurements.
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individually controlled, sai~ controlling being in response to the measured value of the moisture content obtained at the corresponding measuring points.
According to the present invention, the moisture value, determined by the measuring position, is the basis for -the control of the heating power of the pre-dryer. In order to ensure a useful control of the drying operation~
the infrared pre-drying tunnel is sub-divided into at least two, but more advantageously into three or, still better, :Eour fields which in turn are opposite at least two to four measuring positions across the width of the material web, after the pre-dryer. The most certain way is to provide at least 10as many measuring positions, across the width of the material, as there are control possibilities at the drying tunnel.
~ In the claimed process, it is appropriate if the desired residual ; moisture of the fabric (moisture-desired value) is pre-.
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., .~
. ''~:
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set by being programmed into L limiting value circui-t and in this way a ref-erence system for the residual moisture is provided. According to this novel tecimique, ~rom the f;rst moment of starting up the drying process, the heating power of the pre-drying tunnel increases across the whole width until the residual moisture (moisture-actual value) produced by it and then measured corresponds to this limiting value. During the course of the drying operation, the amount of moisture present at any moment is measured continuously across the width of the material web and, likewise con-tinuously and even almost without delay, it is adjusted to the set limiting value of the moisture, in sucll a manner that the same value of the residual moisture results across the whole width of the material.
According to the process, the control of the heating power of several heating fields is effected automatically across the width of the material, by means of electronic control. With a pre-dryer with its many measuring positions, it will hardly be possible any more to effect manual control when there are at least four controllable heating fields; where there are less than four controllable heating fields, however, the pre-drying cannot be set individually and accurately enough. In addition, the delay at the pre-dryer must be kept as small as possible. With the setting of a desired temperature and ventilation limit, a further reference system is provided by the process claimed, by which the heating power of the pre-drying tunnel is accordingly set. The heating power is increased or decreased according to the speed of the material.
The drying unit employed according to the invention is constructed in such a way that it contains controllable and non-controllable heating fields.
~eyer~ the heating fields wh~ch can be switched on and off, and can be controlled, do not extend across the whole ~idth of the material. They are ~ 4 ~
arranged in sllcll a manner tllat several he.ating fields Oe this type, across the width of tlle material, ccm separately heat a-t the edges and in the center.
Thus, by these means, a fabric is pre-clried in such a way that the same residual moisture is exhibited everywhere, according to whether the left hand or the right hand edge dries more strongly, or the dye on this side migrates more strongly. In general the practice is to leave the base load of the infra-red pre-drying tunnel uncontTolled and to regulate the control load with the aid of the moisture measurement on the textile material The principle of the present invention consists in the immediate, that is to say inertia-less or undelayed, transmission of measured values of the moisture to the control of the heating power of the pre-drying tunnel.
In this process the heating fields themselves, as well as, with appropriate circuitry, each radiator are controlled individually, so that an impeccable matching of the heating power to the fabric surface or to the fabric structure is effected. As mentioned already, the transmission of the measured values is effected without inertia. This means that, f~r example, faulty portions due to differing dye application, can no longer occur.
~n the process according to the invention for the control of the pre-drying, it is possible to distribute not only heating fields across the 2Q area of the width of the material. On the contrary, individual radiator rods with shortened lengths can also be used, arranged across the width of the material. These can be switched on or off individually or in particular series. However, it has been found to be particularly advantageous in this connection that it is not necessary to actually switch the heating sources on and off if the particular power of the radiator is adjusted by control of the current ~supply. Ilowever, to prevent the efects of the temperature radiat-ion from acting "stepwise", lt is advantageous, particularly with lower material ~ 5 ~
speeds, to prodllce a convectional distribution by means of a circulation device. By this means it is now also possible to control the air flow conditions within -the tunnel since the power of the circulation device is also controllecl by the moisture measurement. A further control possibility is the amount of the fresh air swcked in.
According to the claimed mode of operation, the contactless moisture measurement of the textile material and the control of the controllable heating fields with low inertia can be effected with the aid of a measuring method based on microwave absorption or microwave reflectlon, or on the basis of infrared absorption or infrared reflection. In this connection use may advantageously be made according to the invention of the subject of German Utility Model. (HOE 76/F 296G). This concerns a device for the simul-; taneous determination of the moisture content at the si~des and in the center of textile webs, with which device the amount of liquor applied to sheet-like structures can be measured, even in the range of high moisture and which consists of microwave transmitters ~horn tTansmitters) distributed across the width of the material web and connected to a microwave oscillator, and approp-riately arranged microwave receivers. The measuring principle of the equipment which operates by microwave absorption and which has the purpose of determining the influence on the microwave power which passes from the transmitters through the material web to the receivers~ is used to control the pre-dryer. The measuring equipment can be provided with as many horn transmitters and receivers as there are control possibilities existing on the pre-dryer. The measuTement of the residual moisture is effected across the width of the material web immediately behind the pre-drying tunnel. The indication of the measuxed value is~effected without delay and gives a control pulse in the mV range, which is employed for the setting of the heating power of the pre-~ 6 t~'7~;~
dryer. T}le accuracy o~ the measurement lies betwecn O.S and 3%. By modulation of the microwave :frequcncy of the osc:illator (Eor example 2.~ to 3.7 cm wave-length), a time-conswning adjustment of the equipment is dispensed with, and the posit:ion of the material web as well as the fluttering of the latter during the measurement no longer have any effect.
Compared with a measuring method which has already been introduced in practice, and which operates with the aid of a reflected microwave beam and which possesses only a single measur:ing position which traverses to and fro in a zig-zag manner across the material, the device described here has the advantage that it possesses at least three horn transmitters across the width of the material web with appropriately located receivers. With a traversing guidance of the measuring head there is not only a great tendency for faults in the equipment, but the corrections are, in addition, much too time-consuming.
Moreover, in this traversing measurement, the running of the material adversely affects the measured results.
~ Compared with the hitherto customary methods for controlling the : residual moisture content, a whole series of advantages which characterize the new technique can be achieved with the aid of the process according to the invention:
As already mentioned above, the new mode of operation results in a much lower loss of material due to uneven d-rying, in contrast to the hitherto empirical settings for the desired residual moisture and for a uniform moisture across the width of the material.
A changeover can be made, during the material run, without particular difficulty, to the pre-drying of a different textile grade, thus also permitting the use of smaller yardages. The organization in a works is therefore much more flexible. A much more even dyeing is obtained across the width of the material ~ 7 .~ ~
7 2~
web.
The residual moistwre can be se-t with impeccable reproducibility across the textile web. 'I'his is possible at any time even if the same grades of material are run at intervals Oe weeks or even months. The moisture measurement without inertia permits, ot' course, the immediate setting of the material speed, for example to a different material grade.
According to the invention, a uniform pre-drying to the desired residual moisture value can be effected even with textile webs which have received a variable wettability across the width as a result of the pre-treatment.
Different fixation conditions for non-uniform material surfaces are dispensed with.
It is also possible without difficulty, according to the new process, to influence the heating power of gas burners3 installed in the pre-drying tunnel, for example, by throttling the gas supply by a means using the results of the moisture measurements.
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Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process in the dyeing or finishing of a textile material web for the uniform pre-drying of a moist web subsequent to a continuous wet treatment operation by measuring the moisture content remaining in the textile material, wherein several measuring positions are arranged transversely to the transport direction of the material immediately behind an infrared pre-drying tunnel for the continuously fed material, and during the passage of the material, measure-ments of the residual moisture content are made at these positions on the textile material by means of a contactless method, the measuring signals thus determined are transmitted with low inertia, to control elements of the preceding pre-dryer where the heating power of each of several separately controllable heating fields, distributed across the width of said pre-drying tunnel is controlled in accordance with the measured values so as to maintain the moisture content at each measurement position at a constant and pre-determined level.
2. A process in the dyeing or finishing of a textile material web for the uniform pre-drying, prior to the complete drying, of a moist web subsequent to a continuous wet treatment operation, said process comprising the steps of continuously measuring, monitoring, and automatically controlling the moisture content remaining in the textile material, said measuring being carried out during the passage of the material through a unit immediately after exit from an infrared pre-drying tunnel for the continuously fed web by means of a contactless method based on microwave absorption, wherein at several measuring positions arranged transversely to the transport direction of the material, existing different values of the residual moisture content at these positions on the textile material at that moment, are continuously determined by means of frequency-modulated micro-waves so as to monitor the same, the measuring values thus determined are transmitted with low impedance to the control elements of the preceding pre-dryer where, while the web is travelling at a constant speed, the heating power of each of several separately controllable heating fields which are distributed across the width of said pre-drying tunnel, is individually controlled, said controlling being in response to the measured value of the moisture content obtained at the corresponding measuring points.
3. A process as claimed in claim 1, wherein at least four measuring positions are provided across the width of the material behind the infrared pre-drying tunnel.
4. A process as claimed in any one of claims 1 to 3 wherein as many measuring positions are distributed across the width of the material as there are controllable heating fields in the infrared pre-drying tunnel.
5. A process as claimed in any one of claims 1 to 3, wherein the desired residual moisture content is programmed into a limiting value circuit and, in this way, a reference system is provided for the residual moisture.
6. A process as claimed in any one of claims 1 to 3, wherein the infrared pre-drying tunnel contains controllable and non-controllable heating fields.
7. A process as claimed in any one of claims 1 to 3, wherein the base load of the infrared pre-drying tunnel remains constant and the control load is regulated with the aid of the moisture measurement on the textile material.
8. A process as claimed in any one of claims 1 to 3, wherein the moisture measurement of the textile material and the control of the controllable heating fields are effected by means of a measuring method based on microwave absorption or microwave reflection.
9. A process as claimed in any one of claims 1 to 3, wherein the moisture measurement of the textile material and the control of the controllable heating fields are effected by means of a measuring method based on infrared absorption or infrared reflection.
``
``
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2655972A DE2655972C3 (en) | 1976-12-10 | 1976-12-10 | Process for uniform pre-drying of textile webs |
| DEP2655972.8 | 1976-12-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1108722A true CA1108722A (en) | 1981-09-08 |
Family
ID=5995173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA292,758A Expired CA1108722A (en) | 1976-12-10 | 1977-12-09 | Process for the uniform dyeing of textile material webs with the aid of a uniform pre-drying |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US4202112A (en) |
| JP (1) | JPS5374185A (en) |
| AT (1) | AT371847B (en) |
| BE (1) | BE861768A (en) |
| CA (1) | CA1108722A (en) |
| CH (1) | CH618064B (en) |
| DE (1) | DE2655972C3 (en) |
| ES (1) | ES464731A1 (en) |
| FR (1) | FR2373762A1 (en) |
| GB (1) | GB1592464A (en) |
| IT (1) | IT1088419B (en) |
| MX (1) | MX147767A (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2470651A1 (en) * | 1979-11-28 | 1981-06-12 | Merrien Pierre | METHOD AND DEVICE FOR AUTOMATING A HOT AIR DRYING CYCLE OF SAND MOLDS |
| US4586268A (en) * | 1982-02-19 | 1986-05-06 | Vepa Aktiengesellschaft | Heat treatment tunnel |
| JPS58158479A (en) * | 1982-03-17 | 1983-09-20 | 株式会社山東鉄工所 | Method of continuously drying cloth |
| SE455479B (en) * | 1982-03-17 | 1988-07-18 | Svecia Silkscreen Maskiner Ab | DRYING FOR A PRINT ON A MATERIAL |
| US4494316A (en) * | 1983-03-14 | 1985-01-22 | Impact Systems, Inc. | Apparatus for drying a moving web |
| JPS6079916A (en) * | 1983-10-11 | 1985-05-07 | Mitsubishi Monsanto Chem Co | Heating method of thermoplastic resin film |
| DE3343430A1 (en) * | 1983-12-01 | 1985-06-13 | Then Maschinen- und Apparatebau GmbH, 7170 Schwäbisch Hall | Process and apparatus for drying textile material |
| US4514913A (en) * | 1984-02-07 | 1985-05-07 | Impact Systems, Inc. | Apparatus for drying a moving web having movable dryer modules |
| TR22993A (en) * | 1984-04-02 | 1989-01-05 | Sinter Ltd | PROCEDURE AND FACILITY FOR DRYING A SERIES OF IMPRESSED WITH HARDENED ARTIFICIAL RECINE |
| JPS61258050A (en) * | 1985-05-09 | 1986-11-15 | ユニチカ株式会社 | Drying method on machine |
| FI80099C (en) * | 1986-10-31 | 1990-04-10 | Imatran Voima Oy | FOERFARANDE OCH ANORDNING FOER TORKNING AV ROERLIGT BANMATERIAL. |
| US5228108A (en) * | 1990-10-03 | 1993-07-13 | Advance Process Supply Company | Resin curing apparatus and method utilizing infrared lamp and blower control means |
| US5249255A (en) * | 1990-10-03 | 1993-09-28 | Wisconsin Automated Machinery Corporation | Resin curing apparatus and method utilizing infrared lamp and blower control means |
| US5337393A (en) * | 1990-11-30 | 1994-08-09 | Glasstech, Inc. | Method for heating a flat glass sheet |
| US5239613A (en) * | 1991-10-09 | 1993-08-24 | American Screen Printing Equipment Company | Method and apparatus for controlling product curing heater |
| NL9201545A (en) * | 1992-09-04 | 1994-04-05 | Oce Nederland Bv | Radiation fixing device. |
| US5377428A (en) * | 1993-09-14 | 1995-01-03 | James River Corporation Of Virginia | Temperature sensing dryer profile control |
| DE69501945T2 (en) * | 1994-05-18 | 1998-09-17 | Commw Scient Ind Res Org | TISSUE CONDITIONING |
| US5659657A (en) * | 1995-05-24 | 1997-08-19 | Brokaw, Inc. | Pivotally mounted radiant heating apparatus with adjustable heaters |
| DE19844927A1 (en) * | 1998-09-30 | 2000-04-06 | Voith Sulzer Papiertech Patent | Measuring system |
| FI112102B (en) | 1999-03-04 | 2003-10-31 | Metso Paper Inc | A method for adjusting machine direction web humidity with a coating machine |
| FI110706B (en) * | 1999-03-04 | 2003-03-14 | Metso Paper Inc | A method for adjusting machine direction web humidity with a coating machine and calender |
| DE10035080C2 (en) * | 1999-08-27 | 2003-06-26 | Gerstendoerfer Hart Barbara | Device and method for the thermal treatment of substrate material |
| US6169848B1 (en) * | 2000-01-06 | 2001-01-02 | Impact Systems, Inc. | Cross-direction dryer for a machine producing sheet material moving in a machine direction having both gas powered and electric heating portions |
| US6452135B1 (en) * | 2001-05-01 | 2002-09-17 | Johnson, Iii Joe P. | Heating unit with selectively energized heating modules |
| FI114452B (en) * | 2001-08-10 | 2004-10-29 | Raute Oyj | Procedure and plant for the production of uniformly moist veneers |
| US6753512B1 (en) * | 2002-01-02 | 2004-06-22 | Simtek, Inc. | Model-based control system for thermally treating webs |
| EP3327395A1 (en) | 2016-11-29 | 2018-05-30 | Valmet Technologies Oy | Radiation device for treating a fiber web and/or eliminating bubbles of a coating of a fiber web and method of treating a fiber web and/or eliminating bubbles of a coating of a fiber web by radiation |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB588573A (en) * | 1944-12-05 | 1947-05-28 | British Cotton Ind Res Assoc | Improved means for the automatic regulation of the action of machines for the continuous processing of materials |
| FR985071A (en) * | 1949-02-18 | 1951-07-13 | Radioelectriques Lab | Device for automatic regulation of certain devices according to the degree of humidity of the material treated therein |
| US3040807A (en) * | 1959-11-04 | 1962-06-26 | Industrial Nucleonics Corp | Moisture balance correction system |
| US3214845A (en) * | 1961-05-24 | 1965-11-02 | Industrial Nucleonics Corp | Moisture measuring and selective dryer control system |
| US3358378A (en) * | 1965-04-19 | 1967-12-19 | Thilmany Pulp & Paper Company | Method and apparatus for measurement of moisture |
| US3731520A (en) * | 1967-10-05 | 1973-05-08 | Industrial Nucleonics Corp | Dryer performance indicator |
| US3848342A (en) * | 1970-04-08 | 1974-11-19 | Eastman Kodak Co | Control system |
| JPS4847914U (en) * | 1971-09-30 | 1973-06-23 | ||
| US3793741A (en) * | 1972-01-07 | 1974-02-26 | Smitherm Industries | Drying apparatus with moisture profile control |
-
1976
- 1976-12-10 DE DE2655972A patent/DE2655972C3/en not_active Expired
-
1977
- 1977-12-03 ES ES464731A patent/ES464731A1/en not_active Expired
- 1977-12-07 IT IT30517/77A patent/IT1088419B/en active
- 1977-12-07 CH CH1501477A patent/CH618064B/en unknown
- 1977-12-08 US US05/858,897 patent/US4202112A/en not_active Expired - Lifetime
- 1977-12-08 GB GB51151/77A patent/GB1592464A/en not_active Expired
- 1977-12-08 JP JP14666377A patent/JPS5374185A/en active Granted
- 1977-12-09 CA CA292,758A patent/CA1108722A/en not_active Expired
- 1977-12-09 MX MX171667A patent/MX147767A/en unknown
- 1977-12-09 AT AT0880077A patent/AT371847B/en not_active IP Right Cessation
- 1977-12-12 FR FR7737352A patent/FR2373762A1/en active Granted
- 1977-12-12 BE BE183381A patent/BE861768A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| GB1592464A (en) | 1981-07-08 |
| DE2655972B2 (en) | 1979-07-26 |
| IT1088419B (en) | 1985-06-10 |
| ATA880077A (en) | 1982-12-15 |
| BE861768A (en) | 1978-06-12 |
| US4202112A (en) | 1980-05-13 |
| MX147767A (en) | 1983-01-11 |
| AT371847B (en) | 1983-08-10 |
| CH618064B (en) | |
| FR2373762B1 (en) | 1982-11-12 |
| DE2655972A1 (en) | 1978-06-22 |
| DE2655972C3 (en) | 1980-03-06 |
| CH618064GA3 (en) | 1980-07-15 |
| JPS5374185A (en) | 1978-07-01 |
| FR2373762A1 (en) | 1978-07-07 |
| ES464731A1 (en) | 1978-09-01 |
| JPS6211108B2 (en) | 1987-03-10 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |