CA2430316C - Oven for drawing fibres at elevated temperature - Google Patents
Oven for drawing fibres at elevated temperature Download PDFInfo
- Publication number
- CA2430316C CA2430316C CA002430316A CA2430316A CA2430316C CA 2430316 C CA2430316 C CA 2430316C CA 002430316 A CA002430316 A CA 002430316A CA 2430316 A CA2430316 A CA 2430316A CA 2430316 C CA2430316 C CA 2430316C
- Authority
- CA
- Canada
- Prior art keywords
- oven
- fibre
- guide rolls
- temperature
- fibres
- 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 - Fee Related
Links
- 239000000835 fiber Substances 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 30
- 239000004698 Polyethylene Substances 0.000 claims abstract description 15
- -1 polyethylene Polymers 0.000 claims abstract description 15
- 229920000573 polyethylene Polymers 0.000 claims abstract description 15
- 238000003280 down draw process Methods 0.000 claims abstract description 3
- 239000002243 precursor Substances 0.000 claims description 13
- 239000002904 solvent Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J1/00—Modifying the structure or properties resulting from a particular structure; Modifying, retaining, or restoring the physical form or cross-sectional shape, e.g. by use of dies or squeeze rollers
- D02J1/22—Stretching or tensioning, shrinking or relaxing, e.g. by use of overfeed and underfeed apparatus, or preventing stretch
- D02J1/222—Stretching in a gaseous atmosphere or in a fluid bed
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02J—FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES OR THE LIKE
- D02J13/00—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass
- D02J13/001—Heating or cooling the yarn, thread, cord, rope, or the like, not specific to any one of the processes provided for in this subclass in a tube or vessel
Abstract
The invention relates to an oven for drawing fibres at elevated temperature, which oven is on two sides opposite one another provided with guide rolls dictating a zigzag up-and-down drawing trajectory for the fibre in the oven.
In the oven according to the invention the drawing trajectory is at least 20 metres long and the rolls are driven. The invention also relates to a process for drawing fibres using the oven according to the invention, in particular to a process for producing highly oriented polyethylene fibres.
In the oven according to the invention the drawing trajectory is at least 20 metres long and the rolls are driven. The invention also relates to a process for drawing fibres using the oven according to the invention, in particular to a process for producing highly oriented polyethylene fibres.
Description
OVEN FOR DRAWING FIBRES AT ELEVATED TEMPERATURE
The invention relates to an oven for drawing fibres at elevated temperature, which oven is on two sides opposite one another provided with guide rolls dictating a zigzag up-and-down trajectory for the fibre in the oven.
The invention also relates to a process for drawing fibres using the oven according to the invention, in particular to a process for producing highly oriented polyethylene fibres.
An oven as described above is known from the journal CHEMIEFASERN TEXTILINDUSTRIE, vol. 35, no. 1 January 1985, Frankfurt/Main, Deutschland, page 33-34;
"Dyneema-Polyethylenfaser fur technische Einsatzgebiete".
This schematically describes that a polyethylene gel fibre is drawn in an oven having two guide rolls on two sides opposite one another, which pass the gel fibre zigzag up-and-down through the oven. The aim of the zigzag passage through the oven is to obtain a long drawing trajectory within a restricted space. Another example of such an oven is described in Example 4 of European Patent Publication No. 205,960. This describes a "multi-pass" oven with 3 traverses and a total drawing trajectory of 12 metres. At the beginning and the end of the drawing trajectory are drawing devices which draw the fibre to a particular draw ratio, determined by the ratio of the speeds of the drawing devices at the end and the beginning. Drawing devices are capable of imposing a velocity and a stress on the fibre because there is sufficient friction resistance between the fibre and the device as a result of several wraps.
The drawback of the known oven is that this one is very unattractive for use on a commercially attractive industrial scale. It is not possible to give a fibre a high draw ratio and obtain a highly oriented fibre in a single step with an acceptable production capacity. In EP-A-205,960 several drawing steps are to this end carried out successively at an increasing drawing stress and drawing temperature and a decreasing drawing rate. This is difficult to implement technically and economically unattractive on an industrial scale. The forces that the fibres exert on the rolls during the drawing at high temperatures cause wear of the bearings and unobserved drifting of the friction of the bearings. Problems of friction of bearings lead to unobserved changes in drawing conditions, to the tearing of yarn and loss of production capacity. The known ovens are also particularly unsuitable for producing fibres having a very low creep rate with an acceptable capacity. Another drawback is that, in production on an industrial scale, the guide rolls have dimensions such that the mass inertia of the guide rolls makes it necessary to start up the drawing process slowly, with a resultant loss of fibres and capacity.
The aim of the invention is to provide a drawing oven that does not possess said drawbacks, or possesses them to a lesser extent.
This aim is achieved according to the invention because the drawing trajectory is at least 20 metres long and the guide rolls are driven.
An aspect of the invention relates to oven for drawing fibres at elevated temperature, which oven is, on two sides opposite one another, provided with guide rolls dictating a zigzag up-and-down drawing trajectory for the fibre in the oven, wherein the drawing trajectory is at least 20 metres long and the guide rolls are driven, the drawing oven further comprising a control system for -2a-separately setting and controlling the peripheral velocity of each guide roll, and the driven guide rolls are provided with devices for determining the power uptake of the driving mechanism so that the speed at which each of the guide rolls is driven is chosen so as to prevent slip between the fibre and the guide roll.
Another aspect of the invention relates to process for producing a highly oriented polyethylene fibre, wherein a lowly oriented polyethylene precursor fibre is drawn in a single step at a temperature of between 135 and 160 C and a draw ratio of at least 2.5 to form a highly oriented polyethylene fibre having a tensile modulus of at least 1000 g/den and a strength of at least 30 g/den, and the precursor fibre is drawn in an oven as aforesaid.
It has been found that with the oven according to the invention it is possible to impose a high draw ratio in a single drawing step with a high production capacity. It is possible to produce fibres with a very low creep rate.
The drawing process is stable, less titre spread occurs a.rnd there is no loss as a result of drift in the friction of bearings. The drawing process can be started up quickly, with minimum loss in the form off-spec material.
The guide rolls are prefexably driven by electromotors. Prefe.rabl.y use is then made of a control systerrt with which the peripheral velocity of each of the guide rolls can be set and controlled separately.
The speed at which each of the guide rolls is driven is chosen so that no slip occurs between the fibre and the guide ro].l, in a preferred enmlaodiment of the invention the drawing oven is provided with devices for measuring the power uptake of the dziving rnechanism of the guide rolls. The advantage of this is that, on the basis of the power consumption, any drift in the friction of the bearings can be observed in due time, before the yarn unexpectedly tears. PreferabJ,y the speed of each of the guide rolls is chosen so that the power uptake of the guide rolls in the drawing process is as low as possible. This power uptake can be determined for each roll separately by compara,ng the power uptake during drawing with the power uptake at the same oven settings withou-t the presence of fibres. The advantage of this is that slip between the fibre and the guide rolls is prevented and that the drawing process is more stable.
Preferably the guide rolls are cylindricalr with a length of at least 20 cm. The advantage of this is that several fibres can be drawn next to one another. The length is preferably at least 50 cm, more preferably even more than 1 metre. It has been found that when a large number of fibres are simultaneously drawn on such long guide rolls the problem arises that the guide rolls bend under the drawing stress, eausing the fibres to move from their posi.tion. With bearZngs on one side, the fibres then ruzl off the roll. With bea.ri.ngs on two sides, the fibres run to the middle of the roll. preferabl.y the bending of the roll during drawing is less than 0.1%.
`Aending of the roll' is here understood to be the maximum deviation of the roll's body axis under the influence of the yarn stress relative to the normal, unstressed condition divided by the roll length (times 100%), Preferably the radius of the guide rolls is at least 2 cm and more preferably at least 5 cm. The bendi.ng of the roll will consequently be less, and the homogeneity of the drawing will be better, especially in the case of thick filaments or multifzlament yarns.
Preferably the length of the drawing trajectory in the oven according to the inven'tiQn is at least 50 rn. More preferably the length of the drawing trajectory is at least 75 m, more preferably at least 100 metres and most preferably more than 125 m. One of the advantages is that a higher draw ratio can be imposed in a single step with an acceptable capacity.
The number of driven guide rolls is then chosen to keep the oven dimensions within acceptable limits and to prevent the risk of the fibres sagging between the guide rolls. Preferably the distance between the guide rolls is more than 2 m, preferably mdre than 5 m, but less than approximately 20 metres, more preferably less than 15 metres and even more preferably less than 10 metres.
The heating in the oven is preferabl.y effected by heated gas. Preferably the oven is provided with devices for realising a flow of heated gas.
Preferably the direction of the flow of gas is at an angle, preferably virtually perpendi.cular, to the main transport direction of the fibres between the guide rolls. The advantage of this is that the distribution .35 of temperature in the oven is better defined and that substances released from the fibre are discharged. In another embodiment the oven is provided with devices for heating or cooling the gas stream to create a temperature gradient in a direction perpendicular to the transport direction, as a result of which the fibre will in particular have a higher or lower temperature at the end of the trajectory than at the beginning. These devices are for example heat exchangers or devices for blowing in gas.
In yet another embodiment the oven has two or more devices for creating a flow of gas in a direction substantially perpendicular to the transport direction of the fibre, it then being possible to set the temperature of the gas flow separately in each of the devices. These devices are preferably next to one another in the transport direction of the fibres. A temperature gradient can thus be created in the transport direction of the fibres. These devices consist of for example a gas heating and a blow-in device.
In a particular embodiment of the oven according to the invention the oven is provided with a gas purification installation for purifying the gas stream.
This embodiment is particularly advantageous for drawing fibres that still contain volatile components which are released during drawing at elevated temperature. That makes the oven suitable as a drying oven.
Preferably the oven then contains devices, on the side opposite that on which the gas flow is created, for leading the gas stream to the gas purification installation.
The invention also relates to a process for drawing fibres in which use is made of an oven according to the invention described above and the fzbres obtainable therewith. The invention also relates to a process for drying and simultaneously drawing a fibre contain.i.ng solvent in which use is made of an oven according to the invention. Preferably the solvent removed from the fibre is recoverQd in the gas purification installation. In the latter process, preferably a temperature gradient has been created in the oven in the direction perpendicular to the transport direction of the fibre, the temperature being higher at the end of the drawing trajectory than at the beginning.
In particular, the invention relates to a process for producing a highly ora.ented polyethylene fibre characterised in that a lowly oriented polyethylene precursor fibre is drawn in a single step at a temperature of between 135 and 160 C, at a draw ratio of at least 2.5, to form a highly oriented polyethylene fibre having a modulus of elasticity of at least 1000 g/den and a strength of at least 30 g/den.
The advantage of said process over the process described in EP-A--205, 96Q is that the process is less laboxious and economically more attracta,ve, especially when used on a large industrial scale. The draw ratio is preferably at least 3, more preferably at least 3.5, even more preferably at least 4 and most preferably at least 4.5.
`Lowly oriented' is here understood to be having a tensile modulus of less than 500 g/den and a tensile strength of less than 20 g/den. Preferably the lowly oriented precursor ~ibre in the process according to the invention has a tensile moduZus of between 150 and 500 g/den and a tensile strength of between 5 g/den and 20 g/den. A temperature gradient can be applied in drawing the precursor fibre. In practice, the drawing temperature will preferably be virt-ually the same in al.l parts of the oven because then a more stable process wa.1l be obtained, that is, there will be ].es=s risk of the yaxn tearing.
Preferably the polyethylene precursor fibre is drawn in the oven aecordizig to the invention as described above. One of the advantages of this is that it is then possible to produce highly oriented polyolefine fibres in a single drawing step on an industrial scale with a good productivity starting from a lowly oriented precursor fibre. Good creep properties can be obtained. `Good creep properties' are understood to be a pl.ateau creep rate (at 710C and 270 MPa) of less than approximately 0.4 %/h, preferably less than 0,2 %/h, and most preferably even less than 0.1%/h.
Other preferred embodiments and advantages have been described above in the description of the drawing oven.
The tensile strength (strenqth) and the tensile modulus (modulus) have been defined and are determined as described in ASTM D885M, using a clamping length of the fibre of 500 mm, a orosshead speed of 50 %/min. and Inst.ron 2714 clamps. The fibre is first twined at 31 rpzn. The modulus is inferred from the measured stress--strain curve as the gradient between 0.3 and 1% elongation. The modulus and strength are ca].culated by dividing the measured tensile forces by the titre, determined by weighing 10 metres of fibre.
zn a particularly preferred embodiment of the process the.precursor fibre is produced by drying and simultaneously drawing a polyethylene gel fibre containing solvent. In this process the temperature of the fibre i,s in a1l parts of the fibrers trajectory through the oven preferably rnore than 10 C lowex than the melting temperature of the fibre to be formed. This pre.scnts the advantage that there is less risk of the yarn tearing and more effective chain orientation takes place. 'Melting temperature~ is understood to be the peak melting teznperature m.easured in a DSC at a heating rate of 10 C/min in an unconstrained sample.
The invention relates to an oven for drawing fibres at elevated temperature, which oven is on two sides opposite one another provided with guide rolls dictating a zigzag up-and-down trajectory for the fibre in the oven.
The invention also relates to a process for drawing fibres using the oven according to the invention, in particular to a process for producing highly oriented polyethylene fibres.
An oven as described above is known from the journal CHEMIEFASERN TEXTILINDUSTRIE, vol. 35, no. 1 January 1985, Frankfurt/Main, Deutschland, page 33-34;
"Dyneema-Polyethylenfaser fur technische Einsatzgebiete".
This schematically describes that a polyethylene gel fibre is drawn in an oven having two guide rolls on two sides opposite one another, which pass the gel fibre zigzag up-and-down through the oven. The aim of the zigzag passage through the oven is to obtain a long drawing trajectory within a restricted space. Another example of such an oven is described in Example 4 of European Patent Publication No. 205,960. This describes a "multi-pass" oven with 3 traverses and a total drawing trajectory of 12 metres. At the beginning and the end of the drawing trajectory are drawing devices which draw the fibre to a particular draw ratio, determined by the ratio of the speeds of the drawing devices at the end and the beginning. Drawing devices are capable of imposing a velocity and a stress on the fibre because there is sufficient friction resistance between the fibre and the device as a result of several wraps.
The drawback of the known oven is that this one is very unattractive for use on a commercially attractive industrial scale. It is not possible to give a fibre a high draw ratio and obtain a highly oriented fibre in a single step with an acceptable production capacity. In EP-A-205,960 several drawing steps are to this end carried out successively at an increasing drawing stress and drawing temperature and a decreasing drawing rate. This is difficult to implement technically and economically unattractive on an industrial scale. The forces that the fibres exert on the rolls during the drawing at high temperatures cause wear of the bearings and unobserved drifting of the friction of the bearings. Problems of friction of bearings lead to unobserved changes in drawing conditions, to the tearing of yarn and loss of production capacity. The known ovens are also particularly unsuitable for producing fibres having a very low creep rate with an acceptable capacity. Another drawback is that, in production on an industrial scale, the guide rolls have dimensions such that the mass inertia of the guide rolls makes it necessary to start up the drawing process slowly, with a resultant loss of fibres and capacity.
The aim of the invention is to provide a drawing oven that does not possess said drawbacks, or possesses them to a lesser extent.
This aim is achieved according to the invention because the drawing trajectory is at least 20 metres long and the guide rolls are driven.
An aspect of the invention relates to oven for drawing fibres at elevated temperature, which oven is, on two sides opposite one another, provided with guide rolls dictating a zigzag up-and-down drawing trajectory for the fibre in the oven, wherein the drawing trajectory is at least 20 metres long and the guide rolls are driven, the drawing oven further comprising a control system for -2a-separately setting and controlling the peripheral velocity of each guide roll, and the driven guide rolls are provided with devices for determining the power uptake of the driving mechanism so that the speed at which each of the guide rolls is driven is chosen so as to prevent slip between the fibre and the guide roll.
Another aspect of the invention relates to process for producing a highly oriented polyethylene fibre, wherein a lowly oriented polyethylene precursor fibre is drawn in a single step at a temperature of between 135 and 160 C and a draw ratio of at least 2.5 to form a highly oriented polyethylene fibre having a tensile modulus of at least 1000 g/den and a strength of at least 30 g/den, and the precursor fibre is drawn in an oven as aforesaid.
It has been found that with the oven according to the invention it is possible to impose a high draw ratio in a single drawing step with a high production capacity. It is possible to produce fibres with a very low creep rate.
The drawing process is stable, less titre spread occurs a.rnd there is no loss as a result of drift in the friction of bearings. The drawing process can be started up quickly, with minimum loss in the form off-spec material.
The guide rolls are prefexably driven by electromotors. Prefe.rabl.y use is then made of a control systerrt with which the peripheral velocity of each of the guide rolls can be set and controlled separately.
The speed at which each of the guide rolls is driven is chosen so that no slip occurs between the fibre and the guide ro].l, in a preferred enmlaodiment of the invention the drawing oven is provided with devices for measuring the power uptake of the dziving rnechanism of the guide rolls. The advantage of this is that, on the basis of the power consumption, any drift in the friction of the bearings can be observed in due time, before the yarn unexpectedly tears. PreferabJ,y the speed of each of the guide rolls is chosen so that the power uptake of the guide rolls in the drawing process is as low as possible. This power uptake can be determined for each roll separately by compara,ng the power uptake during drawing with the power uptake at the same oven settings withou-t the presence of fibres. The advantage of this is that slip between the fibre and the guide rolls is prevented and that the drawing process is more stable.
Preferably the guide rolls are cylindricalr with a length of at least 20 cm. The advantage of this is that several fibres can be drawn next to one another. The length is preferably at least 50 cm, more preferably even more than 1 metre. It has been found that when a large number of fibres are simultaneously drawn on such long guide rolls the problem arises that the guide rolls bend under the drawing stress, eausing the fibres to move from their posi.tion. With bearZngs on one side, the fibres then ruzl off the roll. With bea.ri.ngs on two sides, the fibres run to the middle of the roll. preferabl.y the bending of the roll during drawing is less than 0.1%.
`Aending of the roll' is here understood to be the maximum deviation of the roll's body axis under the influence of the yarn stress relative to the normal, unstressed condition divided by the roll length (times 100%), Preferably the radius of the guide rolls is at least 2 cm and more preferably at least 5 cm. The bendi.ng of the roll will consequently be less, and the homogeneity of the drawing will be better, especially in the case of thick filaments or multifzlament yarns.
Preferably the length of the drawing trajectory in the oven according to the inven'tiQn is at least 50 rn. More preferably the length of the drawing trajectory is at least 75 m, more preferably at least 100 metres and most preferably more than 125 m. One of the advantages is that a higher draw ratio can be imposed in a single step with an acceptable capacity.
The number of driven guide rolls is then chosen to keep the oven dimensions within acceptable limits and to prevent the risk of the fibres sagging between the guide rolls. Preferably the distance between the guide rolls is more than 2 m, preferably mdre than 5 m, but less than approximately 20 metres, more preferably less than 15 metres and even more preferably less than 10 metres.
The heating in the oven is preferabl.y effected by heated gas. Preferably the oven is provided with devices for realising a flow of heated gas.
Preferably the direction of the flow of gas is at an angle, preferably virtually perpendi.cular, to the main transport direction of the fibres between the guide rolls. The advantage of this is that the distribution .35 of temperature in the oven is better defined and that substances released from the fibre are discharged. In another embodiment the oven is provided with devices for heating or cooling the gas stream to create a temperature gradient in a direction perpendicular to the transport direction, as a result of which the fibre will in particular have a higher or lower temperature at the end of the trajectory than at the beginning. These devices are for example heat exchangers or devices for blowing in gas.
In yet another embodiment the oven has two or more devices for creating a flow of gas in a direction substantially perpendicular to the transport direction of the fibre, it then being possible to set the temperature of the gas flow separately in each of the devices. These devices are preferably next to one another in the transport direction of the fibres. A temperature gradient can thus be created in the transport direction of the fibres. These devices consist of for example a gas heating and a blow-in device.
In a particular embodiment of the oven according to the invention the oven is provided with a gas purification installation for purifying the gas stream.
This embodiment is particularly advantageous for drawing fibres that still contain volatile components which are released during drawing at elevated temperature. That makes the oven suitable as a drying oven.
Preferably the oven then contains devices, on the side opposite that on which the gas flow is created, for leading the gas stream to the gas purification installation.
The invention also relates to a process for drawing fibres in which use is made of an oven according to the invention described above and the fzbres obtainable therewith. The invention also relates to a process for drying and simultaneously drawing a fibre contain.i.ng solvent in which use is made of an oven according to the invention. Preferably the solvent removed from the fibre is recoverQd in the gas purification installation. In the latter process, preferably a temperature gradient has been created in the oven in the direction perpendicular to the transport direction of the fibre, the temperature being higher at the end of the drawing trajectory than at the beginning.
In particular, the invention relates to a process for producing a highly ora.ented polyethylene fibre characterised in that a lowly oriented polyethylene precursor fibre is drawn in a single step at a temperature of between 135 and 160 C, at a draw ratio of at least 2.5, to form a highly oriented polyethylene fibre having a modulus of elasticity of at least 1000 g/den and a strength of at least 30 g/den.
The advantage of said process over the process described in EP-A--205, 96Q is that the process is less laboxious and economically more attracta,ve, especially when used on a large industrial scale. The draw ratio is preferably at least 3, more preferably at least 3.5, even more preferably at least 4 and most preferably at least 4.5.
`Lowly oriented' is here understood to be having a tensile modulus of less than 500 g/den and a tensile strength of less than 20 g/den. Preferably the lowly oriented precursor ~ibre in the process according to the invention has a tensile moduZus of between 150 and 500 g/den and a tensile strength of between 5 g/den and 20 g/den. A temperature gradient can be applied in drawing the precursor fibre. In practice, the drawing temperature will preferably be virt-ually the same in al.l parts of the oven because then a more stable process wa.1l be obtained, that is, there will be ].es=s risk of the yaxn tearing.
Preferably the polyethylene precursor fibre is drawn in the oven aecordizig to the invention as described above. One of the advantages of this is that it is then possible to produce highly oriented polyolefine fibres in a single drawing step on an industrial scale with a good productivity starting from a lowly oriented precursor fibre. Good creep properties can be obtained. `Good creep properties' are understood to be a pl.ateau creep rate (at 710C and 270 MPa) of less than approximately 0.4 %/h, preferably less than 0,2 %/h, and most preferably even less than 0.1%/h.
Other preferred embodiments and advantages have been described above in the description of the drawing oven.
The tensile strength (strenqth) and the tensile modulus (modulus) have been defined and are determined as described in ASTM D885M, using a clamping length of the fibre of 500 mm, a orosshead speed of 50 %/min. and Inst.ron 2714 clamps. The fibre is first twined at 31 rpzn. The modulus is inferred from the measured stress--strain curve as the gradient between 0.3 and 1% elongation. The modulus and strength are ca].culated by dividing the measured tensile forces by the titre, determined by weighing 10 metres of fibre.
zn a particularly preferred embodiment of the process the.precursor fibre is produced by drying and simultaneously drawing a polyethylene gel fibre containing solvent. In this process the temperature of the fibre i,s in a1l parts of the fibrers trajectory through the oven preferably rnore than 10 C lowex than the melting temperature of the fibre to be formed. This pre.scnts the advantage that there is less risk of the yarn tearing and more effective chain orientation takes place. 'Melting temperature~ is understood to be the peak melting teznperature m.easured in a DSC at a heating rate of 10 C/min in an unconstrained sample.
Claims (16)
1. Oven for drawing fibres at elevated temperature, which oven is, on two sides opposite one another, provided with guide rolls dictating a zigzag up-and-down drawing trajectory for the fibre in the oven, wherein the drawing trajectory is at least 20 metres long and the guide rolls are driven, the drawing oven further comprising a control system for separately setting and controlling the peripheral velocity of each guide roll, and the driven guide rolls are provided with devices for determining the power uptake of the driving mechanism so that the speed at which each of the guide rolls is driven is chosen so as to prevent slip between the fibre and the guide roll.
2. Oven according to Claim 1, wherein the guide rolls are cylindrical and have a length of at least 20 cm, several fibres being able to be passed over the guide rolls simultaneously next to one another.
3. Oven according to Claim 2, wherein the bending of the roll during the drawing is less than 0.1%.
4. Oven according to any one of Claims 1-3, wherein the drawing trajectory is at least 50 m and the oven contains at least 4 guide rolls.
5. Oven according to any one of Claims 1-4, wherein it is provided with devices for creating a gas flow in a direction substantially perpendicular to the transport direction of the fibres between the guide rolls.
6. Oven according to any one of Claims 1-5, wherein it is provided with devices for heating or cooling the gas stream to create a temperature gradient in a direction perpendicular to the transport direction.
7. Oven according to any one of Claims 1-6, wherein the oven is provided with a gas purification installation.
8. Process for drawing fibres in which use is made of an oven according to any one of Claims 1 up to and including 7.
9. Process for drying and simultaneously drawing a fibre containing solvent, wherein use is made of an oven according to Claim 7, the solvent removed from the fibre being recovered in the gas purification installation.
10. Process according to Claim 9, wherein use is made of an oven according to Claims 6 and 7, a temperature gradient having been created in the oven in the direction perpendicular to the transport direction of the fibre, with the temperature being higher at the end than at the beginning of the drawing trajectory.
11. Process for producing a highly oriented polyethylene fibre, wherein a lowly oriented polyethylene precursor fibre is drawn in a single step at a temperature of between 135 and 160°C and a draw ratio of at least 2.5 to form a highly oriented polyethylene fibre having a tensile modulus of at least 1000 g/den and a strength of at least 30 g/den, and the precursor fibre is drawn in an oven according to any one of Claims 1 up to and including 7.
12. Process according to Claim 11, wherein the precursor fibre has a tensile modulus of between 150 and 500 g/den and a tensile strength of between g/den and 20 g/den.
13. Process according to any one of Claims 11-12, wherein the drawing temperature is virtually the same in all parts of the oven.
14. Process according to any one of Claims 11-13, wherein the precursor fibre has been made by drying and simultaneously drawing according to Claim 9 or Claim 10 a polyethylene gel fibre containing solvent.
15. Process according to Claim 14, wherein the temperature of the fibre is in all parts of the fibre's trajectory through the oven more than 10°C lower than the melting temperature of the lowly oriented precursor fibre to be formed.
16. Process according to Claim 15 wherein the temperature of the gas is in all parts of the oven more than 10°C lower than the melting temperature of the fibre to be formed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1016356 | 2000-10-09 | ||
| NL1016356A NL1016356C2 (en) | 2000-10-09 | 2000-10-09 | Furnace for providing fiber at an elevated temperature. |
| PCT/NL2001/000712 WO2002034980A1 (en) | 2000-10-09 | 2001-09-27 | Oven for drawing fibres at elevated temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2430316A1 CA2430316A1 (en) | 2002-05-02 |
| CA2430316C true CA2430316C (en) | 2009-11-24 |
Family
ID=19772211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002430316A Expired - Fee Related CA2430316C (en) | 2000-10-09 | 2001-09-27 | Oven for drawing fibres at elevated temperature |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US7501082B2 (en) |
| EP (1) | EP1332249B1 (en) |
| JP (1) | JP4808364B2 (en) |
| CN (1) | CN100379914C (en) |
| AT (1) | ATE449204T1 (en) |
| AU (1) | AU2002212823A1 (en) |
| CA (1) | CA2430316C (en) |
| DE (1) | DE60140560D1 (en) |
| NL (1) | NL1016356C2 (en) |
| WO (1) | WO2002034980A1 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100556503B1 (en) * | 2002-11-26 | 2006-03-03 | 엘지전자 주식회사 | Control Method of Drying Time for Dryer |
| US7596882B2 (en) * | 2004-05-13 | 2009-10-06 | Lg Chem, Ltd. | Treater oven for manufacturing prepreg |
| US6969553B1 (en) * | 2004-09-03 | 2005-11-29 | Honeywell International Inc. | Drawn gel-spun polyethylene yarns and process for drawing |
| ATE437982T1 (en) | 2004-09-03 | 2009-08-15 | Honeywell Int Inc | DRAWN GEL FIBER POLYETHYLENE YARN AND DRAWING PROCESS |
| US7147807B2 (en) * | 2005-01-03 | 2006-12-12 | Honeywell International Inc. | Solution spinning of UHMW poly (alpha-olefin) with recovery and recycling of volatile spinning solvent |
| US7370395B2 (en) * | 2005-12-20 | 2008-05-13 | Honeywell International Inc. | Heating apparatus and process for drawing polyolefin fibers |
| US7674409B1 (en) | 2006-09-25 | 2010-03-09 | Honeywell International Inc. | Process for making uniform high strength yarns and fibrous sheets |
| DE102010049325A1 (en) * | 2010-10-22 | 2012-04-26 | Oerlikon Textile Gmbh & Co. Kg | Device for the production of rope-shaped products |
| CN103305999B (en) * | 2013-07-15 | 2016-02-03 | 中国科学院长春应用化学研究所 | Polyimide fiber hot gas spring stove and polyimide fiber hot gas spring method |
| JP7154808B2 (en) * | 2018-04-20 | 2022-10-18 | 株式会社ダイセル | Spinning device and spinning method |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL177759B (en) * | 1979-06-27 | 1985-06-17 | Stamicarbon | METHOD OF MANUFACTURING A POLYTHYTHREAD, AND POLYTHYTHREAD THEREFORE OBTAINED |
| JPS5913261Y2 (en) * | 1980-04-01 | 1984-04-19 | 東邦ベスロン株式会社 | indirect drive roller |
| AU549453B2 (en) * | 1981-04-30 | 1986-01-30 | Allied Corporation | High tenacity, high modulus, cyrstalline thermoplastic fibres |
| US4455273A (en) * | 1982-09-30 | 1984-06-19 | Allied Corporation | Producing modified high performance polyolefin fiber |
| JPS59106523A (en) * | 1982-12-07 | 1984-06-20 | Toray Ind Inc | Yarn-guiding method in preoxidation furnace and apparatus therefor |
| DE3315247A1 (en) * | 1983-04-27 | 1984-10-31 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach | SPIDER |
| EP0205960B1 (en) * | 1985-06-17 | 1990-10-24 | AlliedSignal Inc. | Very low creep, ultra high moduls, low shrink, high tenacity polyolefin fiber having good strength retention at high temperatures and method to produce such fiber |
| JPH01246437A (en) * | 1988-03-25 | 1989-10-02 | Mitsui Petrochem Ind Ltd | Apparatus for dry drawing of filament or such |
| JPH05230732A (en) * | 1992-02-17 | 1993-09-07 | Mitsui Petrochem Ind Ltd | Multistage drawing method and drawing device for high molecular weight polyolefin |
| US5262110A (en) * | 1992-07-31 | 1993-11-16 | Eastman Kodak Company | Apparatus and method for spinning filaments |
| CN1223311A (en) * | 1998-01-14 | 1999-07-21 | 里特机械公司 | Spin draw texturizing or draw texturising machine |
-
2000
- 2000-10-09 NL NL1016356A patent/NL1016356C2/en not_active IP Right Cessation
-
2001
- 2001-09-27 US US10/398,565 patent/US7501082B2/en not_active Expired - Fee Related
- 2001-09-27 CN CNB018202616A patent/CN100379914C/en not_active Expired - Fee Related
- 2001-09-27 AU AU2002212823A patent/AU2002212823A1/en not_active Abandoned
- 2001-09-27 WO PCT/NL2001/000712 patent/WO2002034980A1/en active Application Filing
- 2001-09-27 DE DE60140560T patent/DE60140560D1/en not_active Expired - Lifetime
- 2001-09-27 AT AT01981164T patent/ATE449204T1/en not_active IP Right Cessation
- 2001-09-27 EP EP01981164A patent/EP1332249B1/en not_active Expired - Lifetime
- 2001-09-27 CA CA002430316A patent/CA2430316C/en not_active Expired - Fee Related
- 2001-09-27 JP JP2002537944A patent/JP4808364B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002212823A1 (en) | 2002-05-06 |
| JP4808364B2 (en) | 2011-11-02 |
| DE60140560D1 (en) | 2009-12-31 |
| ATE449204T1 (en) | 2009-12-15 |
| CN1479815A (en) | 2004-03-03 |
| EP1332249A1 (en) | 2003-08-06 |
| CA2430316A1 (en) | 2002-05-02 |
| NL1016356C2 (en) | 2002-04-10 |
| JP2004512436A (en) | 2004-04-22 |
| US7501082B2 (en) | 2009-03-10 |
| CN100379914C (en) | 2008-04-09 |
| WO2002034980A1 (en) | 2002-05-02 |
| EP1332249B1 (en) | 2009-11-18 |
| US20040040176A1 (en) | 2004-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2430316C (en) | Oven for drawing fibres at elevated temperature | |
| RU2423563C2 (en) | Device to heat and method to draw polyolefine fibres | |
| JP2838113B2 (en) | Monofilament with high strength and high tensile uniformity and method and apparatus for spinning and drawing it | |
| US5558825A (en) | Method and apparatus for producing polyester fiber | |
| SU731907A3 (en) | Method of treating non-woven material | |
| ATE315673T1 (en) | SOFT ELASTIC YARNS AND METHOD FOR THE PRODUCTION THEREOF | |
| US3380131A (en) | Method and apparatus deflecting and drawing tow | |
| EP0034880B1 (en) | Process for forming a continuous filament yarn from a melt spinnable polyethylene terephthalat and novel polyester yarns produced by the process | |
| US2624934A (en) | Method of and apparatus for heat treatment of filamentary material | |
| US4501046A (en) | Method and apparatus for producing synthetic multifilament yarn | |
| US7585445B2 (en) | Method for producing high tenacity polypropylene fibers | |
| JPH1112874A (en) | Acrylic fiber yarn, and method and apparatus for steam-drawing of the same, and carbon fiber | |
| CA2280872A1 (en) | Drawing device and method for producing drawn synthetic filaments | |
| KR20050061480A (en) | Method for producing highly stable polypropylene fibres | |
| JPS58163743A (en) | Spun fiber yarn produced by interlacing | |
| KR950001648B1 (en) | Process and device for making synthetic threads or fibers from polymers, especially polyamide, polyester or polypropylene | |
| NO171283B (en) | SYTRAAD, SAAVEL AS A PROCEDURE FOR THE PRODUCTION OF SUCH TRADE | |
| US3654055A (en) | Tow band | |
| KR960002922B1 (en) | Short and long fiber composite yarn and the process and the apparatus for producing the same | |
| RU2082840C1 (en) | Filament treatment method | |
| KR100200039B1 (en) | The polyester fiber manufacture method | |
| KR950000726B1 (en) | Process for preparing a polyester fiber | |
| DK170348B1 (en) | Method of rewinding spinning ribbons | |
| RU2020194C1 (en) | Method for production of polyamide ultimate fiber with fine denier | |
| CZ136593A3 (en) | Method of stretching heated yarn, polyester fibers obtained thereby and their use |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20200928 |