CA2067137C - Coil body for the inductive heating of rollers - Google Patents
Coil body for the inductive heating of rollersInfo
- Publication number
- CA2067137C CA2067137C CA002067137A CA2067137A CA2067137C CA 2067137 C CA2067137 C CA 2067137C CA 002067137 A CA002067137 A CA 002067137A CA 2067137 A CA2067137 A CA 2067137A CA 2067137 C CA2067137 C CA 2067137C
- Authority
- CA
- Canada
- Prior art keywords
- front surface
- coil
- roller
- cooling chamber
- cooling
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 20
- 230000001939 inductive effect Effects 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 239000002826 coolant Substances 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000004020 conductor Substances 0.000 claims description 14
- 239000012809 cooling fluid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 230000006698 induction Effects 0.000 description 4
- 230000005855 radiation Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
- H05B6/14—Tools, e.g. nozzles, rollers, calenders
- H05B6/145—Heated rollers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/36—Coil arrangements
- H05B6/42—Cooling of coils
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
An inductive coil for heating a rotating roller is embedded in a plastic carrier. To cool the plastic carrier in the region of the coil, a cooling element in the form of a flat cooling chamber through which a fluid cooling medium can flow is provided on the front surface of the plastic carrier facing the roller periphery.
Description
COIL BODY FOR THE INDUCTIVE HEATING OF ROLLERS
The invention relates to a coil body for the inductive heating of the surface of a rotating roller made of an electrically conductive material.
A coil body used for inductively heating a roller is shown in EP-OS 59 421. The inductive heating of rollers serves to increase the temperature of the roller surface, allowing the pressure treatment of a web material to be carried out at a higher temperature. The roller can be used, for example, in order to be able to calender a paper web at a higher temperature. For this purpose, a whole number of coil bodies of the type in question are arranged side by side, close to one another, along the roller surface. This can raise the temperature level of the roller as a whole. The bodies can be controlled separately, in order to adjust a certain temperature profile. This can be done because the paper web requires a temperature increase at a certain location, or in order to increase the roller diameter and therefore the linear pressure at the point in question by a local temperature increase.
The coil bodies are shown only schematically in EP-OS 49 421. In practice, they consist of a plastic block, the front side of which is geometrically adapted to the periphery of the roller, i.e. is partially cylindrical. Directly below the partially cylindrical front surface, the coil is embedded in the plastic block. The coil consists of a stranded conductor with many individual wires, the coil having an approximately rectangular cross-section. The stranded conductor is wound into a spiral, with the coil's narrow edge nearest the roll surface. The spiral extends in a partially cylindrical region in the plastic block.
It stands opposite the roller surface at a slight distance, without making contact.
The coil is charged at a medium frequency, for example, in the range of 15 to 18 kHz. Because of this relatively high frequency, the coil wire should be structured as a stranded conductor with individual varnish-insulated wires. The coil is connected to an oscillating circuit with a voltage of about 800 volts.
With coils of this type, temperatures at the surface of the rollers, which consist mostly of steel, run in the range of about 160C. However, recent efforts tend in the direction of increasing the temperature at the surface of the roller to about 250C.
In order to generate such temperatures, an increase in the output of the induction coil is required. The coil wires embedded in the plastic body undergo a great temperature increase due to inductive effects, on the one hand, and by reflection from the relatively hot roller surface, on the other hand. It has been shown that the conventional coil bodies of the type described above are not able to withstand the output increases desired, and that the front surface of the plastic body bursts off after a certain operating period. In many cases, such a coil body could no longer be used after six hours.
The invention is based on the need for making a coil body as described above suitable for higher working temperatures.
.~ccordina to the invention there is provided an apparatus for heating a roller comprising:
a body having a concave front surface conforming to the radially outer periphery of the roller;
an electrical coil embedded in the body adjacent the front surface, whereby said electrical coil heats said roller inductively when the front surface is adjacent to said roller;
a flat concave chamber in the body between said electrical coil and said front surface, said chamber 0 contacting substantially all of the front surface, said chamber being defined by a ridge of uniform height extending around its periphery, and being further defined by a thin cover attached to said ridge, said front surface being on said cover; and means for conveying a cooling fluid into said chamber whereby the cooling fluid cools said front surface as said electrical coil heats said roller.
The invention also provides a coil body for inductively heating the surface of a rotating roller made of electrically conductive material, the roller and body being used for the pressure and temperature treatment of webs of paper and similar materials comprising:
a plastic carrier with a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber behind the front surface, the cooling chamber conducting heat from the front surface, the 2a -~ ~
: ~, ~-~ 23473-159 coolina chamber contacting substantially all of said front surface and havina connections for conveying a fluid coolina medium into and out of said cooling chamber.
The invention further provides an inductive heating apparatus for an electrically conductive roller comprising:
a body constructed of a non-electrically conductive substance;
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said 0 apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructive of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and passage means for conveying a cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling 0 chamber.
2b ~ 23473-159 The partially cylindrical, concave front surface of the plastic carrier is adapted to the radial periphery of the roller, and is intended for application directly in front of the roller periphery. The cooling chamber has the effect that the front surface of the plastic carrier can be kept at temperature low enough so that no destruction takes place and the higher temperatures at the roller surface are withstood over extended periods of time. Tests have shown problem-free operation over 42 hours. The fluid cooling medium not only conducts heat away from the region of the front surface of the plastic carrier, but simultaneously holds the radiation proceeding from the roller surface away from this front surface. The heat output to be conducted away is about 100 watts with a commercial coil body of normal size, which can be easily accomplished by a fluid cooling medium, even without large throughput.
Cooling is known in connection with induction coils.
DE-C2-34 38 375 shows the use of cooling water flowing through an inductive conductor, where the inductive conductor is used for heating a roller surface. However, in this invention, what is used for cooling is a conductor loop made from a solid copper pipe. The present invention, however, involves a greater output concentration, which makes higher frequencies and greater winding numbers necessary and in which a direct flow through the individual conductor can no longer be achieved.
In US Patent No. 4,005,302 a "galette" is described.
The gallete is a rotating heated small drum for stretching yarns, which is inductively heated from the inside. Radially outside the coil which surrounds the bearing journal is a cylindrical cooling chamber through which a cooling medium can flow; this chamber is formed inside the drum.
An important further feature of the invention lies in structuring the limitation surface of the cooling element which faces the roller so as to make it highly heat-reflective. Because of this, the heat flow radiated by the roller is only partially absorbed by the cooling element. The reflection increase of the cooling element can not take place by metallization or application of metallic mirror elements, because these are subject to the induction effect and would also be heated. Rather, it is necessary to bring about the greatest possible reflection capacity, i.e. the highest possible ratio of the amount of incident radiation to reflected radiation, by increasing the degree of whiteness and the polish of the surface.
In the drawings, an embodiment of the invention is shown schematically:
Figure 1 shows a side view of a coil body arranged at a roller surface, in partial cross-section;
Figure 2 shows a view according to Figure 1 from the left along the line II-II in Figure 1;
Figure 3 shows a partial cross-section along the line III-III in Figure 2.
The coil body, designated as 100 in Figure 1, comprises a plastic carrier 1 in the form of a cuboid block with a partially cylindrical front surface 2, which is adapted to fit the outside periphery 3 of a rotating roller 4, i.e. , is coaxially formed with the roller. The rotating roller 4 is represented as a hollow roller made of steel, through which a cross-head (not shown) passes lengthwise. The roller is supported on the inside on the non-rotating cross-head, by means of hydraulic support devices (not shown).
Directly below the front surface 2 an induction coil 5, of which only the outlines are shown in Figure 1, is provided.
The axis of the coil stands perpendicular to the roller surface, and runs in spiral form in a partially cylindrical region 6. The coil is coaxial to the front surface 2, i.e. to the roller periphery 3. The coil wire is formed by a stranded conductor 8 with very many individual wires 9 which are insulated from one another by varnish. The cross-section of the coil wire 7 is rectangular, where the length of the rectangle consists of a multiple of the width. As is evident from Figure 3, the coil wire stands on edge, i.e. with the longer rectangle sides perpendicular to the roller periphery 3.
The "basic outline" of the coil 5 is evident from Figure
The invention relates to a coil body for the inductive heating of the surface of a rotating roller made of an electrically conductive material.
A coil body used for inductively heating a roller is shown in EP-OS 59 421. The inductive heating of rollers serves to increase the temperature of the roller surface, allowing the pressure treatment of a web material to be carried out at a higher temperature. The roller can be used, for example, in order to be able to calender a paper web at a higher temperature. For this purpose, a whole number of coil bodies of the type in question are arranged side by side, close to one another, along the roller surface. This can raise the temperature level of the roller as a whole. The bodies can be controlled separately, in order to adjust a certain temperature profile. This can be done because the paper web requires a temperature increase at a certain location, or in order to increase the roller diameter and therefore the linear pressure at the point in question by a local temperature increase.
The coil bodies are shown only schematically in EP-OS 49 421. In practice, they consist of a plastic block, the front side of which is geometrically adapted to the periphery of the roller, i.e. is partially cylindrical. Directly below the partially cylindrical front surface, the coil is embedded in the plastic block. The coil consists of a stranded conductor with many individual wires, the coil having an approximately rectangular cross-section. The stranded conductor is wound into a spiral, with the coil's narrow edge nearest the roll surface. The spiral extends in a partially cylindrical region in the plastic block.
It stands opposite the roller surface at a slight distance, without making contact.
The coil is charged at a medium frequency, for example, in the range of 15 to 18 kHz. Because of this relatively high frequency, the coil wire should be structured as a stranded conductor with individual varnish-insulated wires. The coil is connected to an oscillating circuit with a voltage of about 800 volts.
With coils of this type, temperatures at the surface of the rollers, which consist mostly of steel, run in the range of about 160C. However, recent efforts tend in the direction of increasing the temperature at the surface of the roller to about 250C.
In order to generate such temperatures, an increase in the output of the induction coil is required. The coil wires embedded in the plastic body undergo a great temperature increase due to inductive effects, on the one hand, and by reflection from the relatively hot roller surface, on the other hand. It has been shown that the conventional coil bodies of the type described above are not able to withstand the output increases desired, and that the front surface of the plastic body bursts off after a certain operating period. In many cases, such a coil body could no longer be used after six hours.
The invention is based on the need for making a coil body as described above suitable for higher working temperatures.
.~ccordina to the invention there is provided an apparatus for heating a roller comprising:
a body having a concave front surface conforming to the radially outer periphery of the roller;
an electrical coil embedded in the body adjacent the front surface, whereby said electrical coil heats said roller inductively when the front surface is adjacent to said roller;
a flat concave chamber in the body between said electrical coil and said front surface, said chamber 0 contacting substantially all of the front surface, said chamber being defined by a ridge of uniform height extending around its periphery, and being further defined by a thin cover attached to said ridge, said front surface being on said cover; and means for conveying a cooling fluid into said chamber whereby the cooling fluid cools said front surface as said electrical coil heats said roller.
The invention also provides a coil body for inductively heating the surface of a rotating roller made of electrically conductive material, the roller and body being used for the pressure and temperature treatment of webs of paper and similar materials comprising:
a plastic carrier with a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber behind the front surface, the cooling chamber conducting heat from the front surface, the 2a -~ ~
: ~, ~-~ 23473-159 coolina chamber contacting substantially all of said front surface and havina connections for conveying a fluid coolina medium into and out of said cooling chamber.
The invention further provides an inductive heating apparatus for an electrically conductive roller comprising:
a body constructed of a non-electrically conductive substance;
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said 0 apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructive of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and passage means for conveying a cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling 0 chamber.
2b ~ 23473-159 The partially cylindrical, concave front surface of the plastic carrier is adapted to the radial periphery of the roller, and is intended for application directly in front of the roller periphery. The cooling chamber has the effect that the front surface of the plastic carrier can be kept at temperature low enough so that no destruction takes place and the higher temperatures at the roller surface are withstood over extended periods of time. Tests have shown problem-free operation over 42 hours. The fluid cooling medium not only conducts heat away from the region of the front surface of the plastic carrier, but simultaneously holds the radiation proceeding from the roller surface away from this front surface. The heat output to be conducted away is about 100 watts with a commercial coil body of normal size, which can be easily accomplished by a fluid cooling medium, even without large throughput.
Cooling is known in connection with induction coils.
DE-C2-34 38 375 shows the use of cooling water flowing through an inductive conductor, where the inductive conductor is used for heating a roller surface. However, in this invention, what is used for cooling is a conductor loop made from a solid copper pipe. The present invention, however, involves a greater output concentration, which makes higher frequencies and greater winding numbers necessary and in which a direct flow through the individual conductor can no longer be achieved.
In US Patent No. 4,005,302 a "galette" is described.
The gallete is a rotating heated small drum for stretching yarns, which is inductively heated from the inside. Radially outside the coil which surrounds the bearing journal is a cylindrical cooling chamber through which a cooling medium can flow; this chamber is formed inside the drum.
An important further feature of the invention lies in structuring the limitation surface of the cooling element which faces the roller so as to make it highly heat-reflective. Because of this, the heat flow radiated by the roller is only partially absorbed by the cooling element. The reflection increase of the cooling element can not take place by metallization or application of metallic mirror elements, because these are subject to the induction effect and would also be heated. Rather, it is necessary to bring about the greatest possible reflection capacity, i.e. the highest possible ratio of the amount of incident radiation to reflected radiation, by increasing the degree of whiteness and the polish of the surface.
In the drawings, an embodiment of the invention is shown schematically:
Figure 1 shows a side view of a coil body arranged at a roller surface, in partial cross-section;
Figure 2 shows a view according to Figure 1 from the left along the line II-II in Figure 1;
Figure 3 shows a partial cross-section along the line III-III in Figure 2.
The coil body, designated as 100 in Figure 1, comprises a plastic carrier 1 in the form of a cuboid block with a partially cylindrical front surface 2, which is adapted to fit the outside periphery 3 of a rotating roller 4, i.e. , is coaxially formed with the roller. The rotating roller 4 is represented as a hollow roller made of steel, through which a cross-head (not shown) passes lengthwise. The roller is supported on the inside on the non-rotating cross-head, by means of hydraulic support devices (not shown).
Directly below the front surface 2 an induction coil 5, of which only the outlines are shown in Figure 1, is provided.
The axis of the coil stands perpendicular to the roller surface, and runs in spiral form in a partially cylindrical region 6. The coil is coaxial to the front surface 2, i.e. to the roller periphery 3. The coil wire is formed by a stranded conductor 8 with very many individual wires 9 which are insulated from one another by varnish. The cross-section of the coil wire 7 is rectangular, where the length of the rectangle consists of a multiple of the width. As is evident from Figure 3, the coil wire stands on edge, i.e. with the longer rectangle sides perpendicular to the roller periphery 3.
The "basic outline" of the coil 5 is evident from Figure
2 and indicated with the progression of the center line 10 of the coil wire 7. The coil wire 7 runs, with its center line 10, from the incoming line 11 along a rectangular (adapted to the cross-section of the plastic carrier 1) spiral-shaped path from the incoming line 11 to the return line 12 and thus forms a spiral-shaped coil with six windings in the embodiment shown.
The coil 5 is cast into the material of the plastic carrier 1. The front surface 2 of the plastic carrier 1 stands opposite the roller periphery 3 at a slight distance. The region of the plastic carrier 1 which is located in the vicinity of the front surface 2 experiences a significant temperature stress, which results in destruction there, also due to the different materials of the coil 5 and the plastic carrier 1, if particularly great output is demanded.
For this reason, a flat cooling element, designated as a whole as 20, which completely covers the front surface 2, is provided in front of the front surface 2, which element is structured as a cooling chamber 13, through which cooling water 14 flows. The cooling chamber 13 is delimited by a ridge 15 which borders the front surface 2 in closed manner, on which ridge a cover 16 in the form of a thin plastic blade, for example with a thickness of 1 mm, is applied, so that the cooling chamber 13 is closed off, except for the inlet 17 and the outlet 18. Since the circumferential ridge 15 has a uniform height of 3 mm, for example, all the way around, the cover 16 automatically takes a shape adapted to the roller periphery 3, and stands opposite the roller periphery 3 with the least possible distance in operation.
The height of the chamber 13 should be as low as possible, so that the coil 5 can be moved as close as possible to the roller periphery 3 in spite of the presence of the cooling element 20, which helps to further the degree of effectiveness of the inductive heating by the coil 5.
The surface of the blade-shaped cover 16 of the cooling chamber 13 which faces the roller periphery 3 is white and polished, in order to reflect the greatest possible proportion of the heat radiated by the roller periphery 3.
The coil 5 is cast into the material of the plastic carrier 1. The front surface 2 of the plastic carrier 1 stands opposite the roller periphery 3 at a slight distance. The region of the plastic carrier 1 which is located in the vicinity of the front surface 2 experiences a significant temperature stress, which results in destruction there, also due to the different materials of the coil 5 and the plastic carrier 1, if particularly great output is demanded.
For this reason, a flat cooling element, designated as a whole as 20, which completely covers the front surface 2, is provided in front of the front surface 2, which element is structured as a cooling chamber 13, through which cooling water 14 flows. The cooling chamber 13 is delimited by a ridge 15 which borders the front surface 2 in closed manner, on which ridge a cover 16 in the form of a thin plastic blade, for example with a thickness of 1 mm, is applied, so that the cooling chamber 13 is closed off, except for the inlet 17 and the outlet 18. Since the circumferential ridge 15 has a uniform height of 3 mm, for example, all the way around, the cover 16 automatically takes a shape adapted to the roller periphery 3, and stands opposite the roller periphery 3 with the least possible distance in operation.
The height of the chamber 13 should be as low as possible, so that the coil 5 can be moved as close as possible to the roller periphery 3 in spite of the presence of the cooling element 20, which helps to further the degree of effectiveness of the inductive heating by the coil 5.
The surface of the blade-shaped cover 16 of the cooling chamber 13 which faces the roller periphery 3 is white and polished, in order to reflect the greatest possible proportion of the heat radiated by the roller periphery 3.
Claims (18)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An apparatus for heating a roller comprising:
a body having a concave front surface conforming to the radially outer periphery of the roller;
an electrical coil embedded in the body adjacent the front surface, whereby said electrical coil heats said roller inductively when the front surface is adjacent to said roller;
a flat concave chamber in the body between said electrical coil and said front surface, said chamber contacting substantially all of the front surface, said chamber being defined by a ridge of uniform height extending around its periphery, and being further defined by a thin cover attached to said ridge, said front surface being on said cover; and means for conveying a cooling fluid into said chamber whereby the cooling fluid cools said front surface as said electrical coil heats said roller.
a body having a concave front surface conforming to the radially outer periphery of the roller;
an electrical coil embedded in the body adjacent the front surface, whereby said electrical coil heats said roller inductively when the front surface is adjacent to said roller;
a flat concave chamber in the body between said electrical coil and said front surface, said chamber contacting substantially all of the front surface, said chamber being defined by a ridge of uniform height extending around its periphery, and being further defined by a thin cover attached to said ridge, said front surface being on said cover; and means for conveying a cooling fluid into said chamber whereby the cooling fluid cools said front surface as said electrical coil heats said roller.
2. The apparatus of claim 1, wherein:
the means of said cooling fluid is water.
the means of said cooling fluid is water.
3. The apparatus of claim 1, wherein:
the front surface is polished so as to be highly reflective.
the front surface is polished so as to be highly reflective.
4. The apparatus of claim 1, wherein:
the body is constructed of a non-electrically conductive material.
the body is constructed of a non-electrically conductive material.
5. The apparatus of any one of claims 1 to 4 wherein:
the exterior of the chamber is constructed of a non-electrically conductive material.
the exterior of the chamber is constructed of a non-electrically conductive material.
6. A coil body for inductively heating the surface of a rotating roller made of electrically conductive material, the roller and body being used for the pressure and temperature treatment of webs of paper and similar materials comprising:
a plastic carrier with a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber behind the front surface, the cooling chamber conducting heat from the front surface, the cooling chamber contacting substantially all of said front surface and having connections for conveying a fluid cooling medium into and out of said cooling chamber.
a plastic carrier with a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber behind the front surface, the cooling chamber conducting heat from the front surface, the cooling chamber contacting substantially all of said front surface and having connections for conveying a fluid cooling medium into and out of said cooling chamber.
7. The coil body of claim 6, wherein:
the cooling chamber is bordered by a ridge of uniform height, and is covered by a thin-walled, partially cylindrical plastic cover, the cover being sealed to the ridge, and wherein the front surface is on said cover.
the cooling chamber is bordered by a ridge of uniform height, and is covered by a thin-walled, partially cylindrical plastic cover, the cover being sealed to the ridge, and wherein the front surface is on said cover.
8. The coil body of claim 7, wherein:
the front surface is highly heat-reflective.
the front surface is highly heat-reflective.
9. The coil body of claim 6, 7 or 8, wherein:
the front surface is white and highly polished.
the front surface is white and highly polished.
10. An inductive heating apparatus for an electrically conductive roller comprising:
a body constructed of a non-electrically conductive substance:
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructive of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and passage means for conveying a cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling chamber.
a body constructed of a non-electrically conductive substance:
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructive of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and passage means for conveying a cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling chamber.
11. The inductive heating apparatus of claim 10, wherein:
said surface is highly polished on its outer periphery.
said surface is highly polished on its outer periphery.
12. The inductive heating apparatus of claim 10 or 11 wherein:
said coil is a spiral coil; and the cooling chamber is interposed between the surface and the coil.
said coil is a spiral coil; and the cooling chamber is interposed between the surface and the coil.
13. A coil body for inductively heating the surface of a rotating roller made of electrically conductive material, the roller and body being used for the pressure and temperature treatment of webs of paper and similar materials, said coil body comprising:
a plastic carrier comprising a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber in front of the front surface, said flat cooling chamber covering substantially the front surface, the cooling chamber conducting heat from the front surface, the cooling chamber having connections for conveying a fluid cooling medium into and out of said cooling chamber, said flat cooling chamber being surrounded by a ridge of uniform height which is closed except for the connections for conveying said fluid cooling medium, said cooling chamber being covered by a thin-walled plastic cover sealed to the ridge and coaxial with the front surface.
a plastic carrier comprising a partially cylindrical concave front surface;
a coil embedded in the plastic carrier behind the front surface;
a flat cooling chamber in front of the front surface, said flat cooling chamber covering substantially the front surface, the cooling chamber conducting heat from the front surface, the cooling chamber having connections for conveying a fluid cooling medium into and out of said cooling chamber, said flat cooling chamber being surrounded by a ridge of uniform height which is closed except for the connections for conveying said fluid cooling medium, said cooling chamber being covered by a thin-walled plastic cover sealed to the ridge and coaxial with the front surface.
14. The coil body of claim 13, wherein:
a surface of said thin walled plastic cover adjacent the roller is highly heat-reflective.
a surface of said thin walled plastic cover adjacent the roller is highly heat-reflective.
15. The coil body of claim 14, wherein:
the surface of said thin walled plastic cover adjacent the roller is white and highly polished.
the surface of said thin walled plastic cover adjacent the roller is white and highly polished.
16. An inductive heating apparatus for an electrically conductive roller comprising:
a body constructed of a non-electrically conductive substance;
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructed of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and a passage for conveying cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling chamber.
a body constructed of a non-electrically conductive substance;
an electrical coil embedded in said body, said electrical coil acting to inductively heat said roller when said apparatus is adjacent said roller;
a concave cylindrical surface attached to said body, said surface being constructed of a non-electrically conductive substance;
a ridge sealed to said body and to said surface, said body, ridge and surface defining therebetween a cooling chamber; and a passage for conveying cooling fluid into and out of said cooling chamber, wherein said surface is cooled by the conveyance of cooling fluid into and out of said cooling chamber.
17. The inductive heating apparatus of claim 16, wherein:
said surface is highly reflective on its outer periphery.
said surface is highly reflective on its outer periphery.
18. The inductive heating apparatus of claim 16, wherein:
said coil is a spiral coil; and the cooling chamber is interposed between the surface and the coil.
said coil is a spiral coil; and the cooling chamber is interposed between the surface and the coil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3934208.5 | 1989-10-13 | ||
| DE3934208A DE3934208C2 (en) | 1989-10-13 | 1989-10-13 | Coil formers for the inductive heating of rolls |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2067137A1 CA2067137A1 (en) | 1991-04-14 |
| CA2067137C true CA2067137C (en) | 1997-05-20 |
Family
ID=6391403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002067137A Expired - Fee Related CA2067137C (en) | 1989-10-13 | 1990-07-24 | Coil body for the inductive heating of rollers |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US5283409A (en) |
| EP (1) | EP0495780B1 (en) |
| JP (1) | JPH077702B2 (en) |
| CA (1) | CA2067137C (en) |
| DE (2) | DE3934208C2 (en) |
| FI (1) | FI100447B (en) |
| RU (1) | RU2069453C1 (en) |
| WO (1) | WO1991006194A1 (en) |
Families Citing this family (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641422A (en) | 1991-04-05 | 1997-06-24 | The Boeing Company | Thermoplastic welding of organic resin composites using a fixed coil induction heater |
| US5723849A (en) | 1991-04-05 | 1998-03-03 | The Boeing Company | Reinforced susceptor for induction or resistance welding of thermoplastic composites |
| US5624594A (en) | 1991-04-05 | 1997-04-29 | The Boeing Company | Fixed coil induction heater for thermoplastic welding |
| US5728309A (en) | 1991-04-05 | 1998-03-17 | The Boeing Company | Method for achieving thermal uniformity in induction processing of organic matrix composites or metals |
| US5645744A (en) | 1991-04-05 | 1997-07-08 | The Boeing Company | Retort for achieving thermal uniformity in induction processing of organic matrix composites or metals |
| US5808281A (en) | 1991-04-05 | 1998-09-15 | The Boeing Company | Multilayer susceptors for achieving thermal uniformity in induction processing of organic matrix composites or metals |
| US5793024A (en) | 1991-04-05 | 1998-08-11 | The Boeing Company | Bonding using induction heating |
| US7126096B1 (en) | 1991-04-05 | 2006-10-24 | Th Boeing Company | Resistance welding of thermoplastics in aerospace structure |
| US5500511A (en) * | 1991-10-18 | 1996-03-19 | The Boeing Company | Tailored susceptors for induction welding of thermoplastic |
| US5444220A (en) * | 1991-10-18 | 1995-08-22 | The Boeing Company | Asymmetric induction work coil for thermoplastic welding |
| US5508496A (en) * | 1991-10-18 | 1996-04-16 | The Boeing Company | Selvaged susceptor for thermoplastic welding by induction heating |
| FR2693073A1 (en) * | 1992-06-24 | 1993-12-31 | Celes | Device for protecting and cooling the poles of an electromagnetic inductor. |
| NZ265252A (en) * | 1993-04-13 | 1996-09-25 | Ciba Geigy Ag | Aminooxy cycloalkylene amines and medicaments |
| US5710412A (en) * | 1994-09-28 | 1998-01-20 | The Boeing Company | Fluid tooling for thermoplastic welding |
| US5660669A (en) * | 1994-12-09 | 1997-08-26 | The Boeing Company | Thermoplastic welding |
| US5486684A (en) * | 1995-01-03 | 1996-01-23 | The Boeing Company | Multipass induction heating for thermoplastic welding |
| US5573613A (en) * | 1995-01-03 | 1996-11-12 | Lunden; C. David | Induction thermometry |
| US5717191A (en) * | 1995-06-06 | 1998-02-10 | The Boeing Company | Structural susceptor for thermoplastic welding |
| US6602810B1 (en) | 1995-06-06 | 2003-08-05 | The Boeing Company | Method for alleviating residual tensile strain in thermoplastic welds |
| US5705795A (en) * | 1995-06-06 | 1998-01-06 | The Boeing Company | Gap filling for thermoplastic welds |
| US5556565A (en) * | 1995-06-07 | 1996-09-17 | The Boeing Company | Method for composite welding using a hybrid metal webbed composite beam |
| US5829716A (en) * | 1995-06-07 | 1998-11-03 | The Boeing Company | Welded aerospace structure using a hybrid metal webbed composite beam |
| US5756973A (en) * | 1995-06-07 | 1998-05-26 | The Boeing Company | Barbed susceptor for improviing pulloff strength in welded thermoplastic composite structures |
| US5568235A (en) * | 1995-06-22 | 1996-10-22 | Xerox Corporation | Induction heated intermediate transfer member |
| US5760379A (en) * | 1995-10-26 | 1998-06-02 | The Boeing Company | Monitoring the bond line temperature in thermoplastic welds |
| US5916469A (en) * | 1996-06-06 | 1999-06-29 | The Boeing Company | Susceptor integration into reinforced thermoplastic composites |
| US5869814A (en) * | 1996-07-29 | 1999-02-09 | The Boeing Company | Post-weld annealing of thermoplastic welds |
| US5902935A (en) * | 1996-09-03 | 1999-05-11 | Georgeson; Gary E. | Nondestructive evaluation of composite bonds, especially thermoplastic induction welds |
| US6284089B1 (en) | 1997-12-23 | 2001-09-04 | The Boeing Company | Thermoplastic seam welds |
| DE19921546B4 (en) * | 1999-05-11 | 2004-03-25 | Friedrich Von Rohrscheidt | Folienlaminator |
| US8770732B2 (en) | 2010-12-08 | 2014-07-08 | Xerox Corporation | Inductive heater for a solid ink reservoir |
| CN102802291B (en) * | 2012-08-09 | 2014-06-04 | 杭州卓达节能设备有限公司 | Built-in electromagnetic heating roll |
| JP6111696B2 (en) * | 2013-01-30 | 2017-04-12 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| DE102013008068A1 (en) * | 2013-05-10 | 2014-11-13 | Oerlikon Textile Gmbh & Co. Kg | Method and device for determining a surface temperature of an inductively heated roll shell |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2277223A (en) * | 1941-04-26 | 1942-03-24 | Induction Heating Corp | Electric induction furnace |
| US2351300A (en) * | 1942-05-25 | 1944-06-13 | Budd Induction Heating Inc | Induction heating apparatus |
| US3674247A (en) * | 1970-03-27 | 1972-07-04 | Park Ohio Industries Inc | Apparatus and method of inductively heating and quench hardening an elongated workpiece |
| CH573992A5 (en) * | 1973-11-02 | 1976-03-31 | Rieter Ag Maschf | |
| SU748918A1 (en) * | 1977-12-26 | 1980-07-15 | Московский Ордена Ленина Энергетический Институт | Induction heating apparatus |
| US4251705A (en) * | 1979-05-14 | 1981-02-17 | Park-Ohio Industries, Inc. | Inductor for hardening gear teeth |
| FR2457619A2 (en) * | 1979-05-23 | 1980-12-19 | Siderurgie Fse Inst Rech | SLIDING FIELD INDUCTION HEATING OVEN |
| US4384514A (en) * | 1981-03-03 | 1983-05-24 | Consolidated-Bathurst Inc. | Nip control method and apparatus |
| DE3438375A1 (en) * | 1984-10-19 | 1986-04-24 | Küsters, Eduard, 4150 Krefeld | Device for the inductive heating of rollers |
| US4621177A (en) * | 1985-03-27 | 1986-11-04 | Beloit Corporation | Inductor configuration for eddy current heating in the papermaking process |
| FR2630612B1 (en) * | 1988-04-26 | 1996-05-24 | Siderurgie Fse Inst Rech | DEVICE FOR PROTECTING INDUCER POLES AND INDUCER PROVIDED WITH SUCH DEVICE |
| US5101086A (en) * | 1990-10-25 | 1992-03-31 | Hydro-Quebec | Electromagnetic inductor with ferrite core for heating electrically conducting material |
-
1989
- 1989-10-13 DE DE3934208A patent/DE3934208C2/en not_active Expired - Fee Related
-
1990
- 1990-07-24 RU SU905011774A patent/RU2069453C1/en active
- 1990-07-24 WO PCT/DE1990/000561 patent/WO1991006194A1/en active IP Right Grant
- 1990-07-24 CA CA002067137A patent/CA2067137C/en not_active Expired - Fee Related
- 1990-07-24 JP JP2510252A patent/JPH077702B2/en not_active Expired - Fee Related
- 1990-07-24 EP EP90910553A patent/EP0495780B1/en not_active Expired - Lifetime
- 1990-07-24 DE DE9090910553T patent/DE59001980D1/en not_active Expired - Fee Related
-
1992
- 1992-04-10 FI FI921591A patent/FI100447B/en active
- 1992-04-13 US US07/847,084 patent/US5283409A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59001980D1 (en) | 1993-08-19 |
| JPH077702B2 (en) | 1995-01-30 |
| US5283409A (en) | 1994-02-01 |
| RU2069453C1 (en) | 1996-11-20 |
| WO1991006194A1 (en) | 1991-05-02 |
| CA2067137A1 (en) | 1991-04-14 |
| DE3934208A1 (en) | 1991-04-25 |
| FI921591A (en) | 1992-04-10 |
| DE3934208C2 (en) | 1994-02-17 |
| FI100447B (en) | 1997-11-28 |
| EP0495780A1 (en) | 1992-07-29 |
| EP0495780B1 (en) | 1993-07-14 |
| JPH05500433A (en) | 1993-01-28 |
| FI921591A0 (en) | 1992-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |