JP3208514B2 - Induction heating roller device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating roller device.

[0002]

2. Description of the Related Art An electromagnetic induction heating mechanism provided with an induction coil is installed inside a rotating hollow roller to cause the peripheral wall of the roller to generate Joule heat by an induced current. An induction heating roller device which is provided with a jacket chamber in which a medium is sealed, and is configured to equalize the surface temperature of the roller by vaporizing and condensing the heating medium,
It is already well known.

Using such an induction heating roller device, a thermoplastic sheet material such as plastic or rubber is continuously hot-rolled, and an irregular pattern is formed on the surface of the sheet material. There is. In this case, marking is performed on the surface of the roller, such as satin finish, engraving, or the like, and a sheet material is attached thereto, thereby transferring these patterns to the sheet material.

More specifically, when the continuously fed sheet material comes into contact with the surface of the heat-generating roller, it is softened by the heat. Further, when the sheet is pressed against the roller by a pressing roller or the like, the softened portion of the sheet material bites into the uneven portion on the roller surface. As a result, the pattern on the surface of the roller is transferred. After the transfer is completed, the sheet is separated from the roller and wound up.

However, when the sheet is separated from the rollers in such a patterning process, the sheet is still in a softened state. Therefore, immediately after the sheet is separated, the transferred pattern on the sheet surface loses its shape or deforms. May occur. In order to avoid this, conventionally, the sheet is cooled and hardened by blowing cold air on the sheet immediately before the sheet is separated or by spraying mist-like cold water on the surface of the roller to separate the sheet.

However, according to such a cooling means, it is extremely difficult to uniformly cool the sheet in the width direction, so that the cooling effect along the sheet width direction becomes uneven, and the pattern is partially deformed. In some cases, the mold is lost or the mold is lost.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a method of transferring a pattern on a roller surface by bringing a sheet into contact with a roller which is rotating due to induced heat. The purpose is to uniformly cool the roller surface area located further forward along its width direction.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a plurality of first and second jacket chambers extending along the axial direction of the peripheral wall of a roller and arranged along the circumferential direction of the roller are provided on the peripheral wall of the roller. The first and second rollers are provided on the outer peripheral side and the inner peripheral side of the roller.
The jacket chambers are individually connected and gas-liquid 2
An extension jacket chamber communicating with the end of the first jacket chamber on the outer peripheral side of the roller, and the lower side of the roller from the time when the sheet is transferred by the roller until the sheet is separated from the roller. A cooling mechanism for cooling the extension jacket chamber is provided in the rotation area.

[0009]

With respect to the first and second jacket chambers in the upper rotation region of the roller, the liquid-phase heat medium inside the first and second jacket chambers is moved into the second jacket chamber on the inner peripheral side of the roller by its gravity. Runs down and stays. Then, the heat medium in the liquid phase inside the second jacket chamber is heated by Joule heat generated on the inner peripheral side of the roller, and this is vaporized,
Evaporates to a gas phase. The heat medium in the gas phase flows into the first jacket chamber, where it condenses to generate latent heat. This latent heat uniformly heats the outer peripheral wall of the roller in the axial direction. The heat causes the sheet to heat and soften, where the pattern on the roller surface is transferred to the sheet.

[0010] With respect to the first and second jacket chambers in the lower rotation area of the roller after passing the transfer rotation area of the roller, the liquid heat medium inside the first and second jacket chambers is moved to the outer peripheral side of the roller by the gravity. It flows down and stays inside a certain first jacket chamber. In this case, the Joule heat generated on the inner peripheral side of the roller does not contribute to vaporization and evaporation because the second jacket chamber on the inner peripheral side of the roller has no liquid phase heat medium. Therefore, the outer peripheral wall of the roller is not heated by the latent heat of the heat medium, and the temperature rise is suppressed.

In the lower rotation region of the roller, the heat remaining in the outer peripheral wall of the roller heats the liquid phase heat medium in the first jacket chamber, and evaporates and evaporates.
However, when a temperature difference is generated between the first jacket chamber and the extension jacket chamber which is communicated with the first jacket chamber by the cooling mechanism, the vapor phase generated in the first jacket chamber is reduced. The heating medium flows into the extension jacket chamber, where it is cooled and condensed. In this way, the heat of the outer peripheral wall of the roller is transported as latent heat to the extended jacket chamber, whereby the outer peripheral wall of the roller uniformly cools down in its width direction.

In the lower rotation area of the roller, the outer peripheral wall of the roller is cooled, so that the sheet thermally transferred by the roller is cooled and slightly hardened, and is subsequently separated from the roller. Even in such a case, the transferred pattern loses its shape and no deformation occurs. Also, even if a little mold loss occurs, since the temperature of the outer peripheral wall of the roller is uniform,
The degree of curing of the sheet is also constant, and constant deformation occurs in the width direction of the roller, thereby preventing the occurrence of pattern deformation unevenness.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a roller, 2 is an end plate for closing both ends of the roller 1, 3 is a drive shaft integrated with the end plate 2, and is rotatably supported by a machine base 4 via a bearing 5. The roller 1 is rotated by a required drive source, and the roller 1 is rotated by the rotation. 6
Is an electromagnetic induction heating mechanism provided with an induction coil 7, and when this is excited by an AC power supply, the roller 1 generates induction heat. 8 is a lead wire of the induction coil 7, 9 is a support rod for supporting the electromagnetic induction heating mechanism 6, and this is a drive shaft 3
And is supported by the drive shaft 3 via a bearing 10. These configurations are not particularly different from the conventional induction heating roller device of this type.

According to the present invention, a plurality of first jacket chambers 1 extending independently along the axial direction and arranged along the circumferential direction of the roller 1 are provided on the peripheral wall of the roller 1.
1 is provided. Similarly, on the peripheral wall of the roller 1, there are a plurality of rollers that are located on the inner peripheral side of the roller 1 from the jacket chamber 11, each of which extends independently along the axial direction and is arranged along the circumferential direction of the roller 1. A second jacket chamber 12 is provided.

The jacket room 11 and the jacket room 1
2 are individually communicated with each other by a communication hole 13 extending in the radial direction of the roller 1, and a gas-liquid two-phase heat medium 14 is sealed in the jacket chamber. Heat medium 14 is connected to communication hole 13
Flows between the jacket chambers 11 and 12 through the airbag. An extended jacket chamber 15 is provided on the end face of the roller 1 so as to communicate with the end of each jacket chamber 11. The extension jacket chamber 15 is formed of, for example, a cylindrical body having one end opened, and is configured by fixing an opening end surface thereof to an end surface of the roller 1 by welding or the like. Cooling fins 16 are provided on the outer periphery of the extension jacket chamber 15.

The end face of the roller 1 has an extension jacket chamber 1
A cooling chamber 17 is provided so as to surround the cooling chamber 5, and a liquid refrigerant 18 is stored in the cooling chamber 17. The refrigerant 18 is stored in the cooling chamber 17 in the lower rotation area of the roller 1 due to its gravity, and is extended through the cooling fin 16 to the extension jacket chamber 1.
5 is cooled. The area where the coolant 18 is stored is the lower cooling area of the roller 1.

The sheet 19 is conveyed to the peripheral wall of the roller 1 along the circumferential direction thereof while the roller 1 rotates and the circumference of the roller 1 is brought into contact. The conveyed sheet 19 is pressed against the surface of the roller 1 by the pressing roller 20. At the beginning of the conveyance, the upper rotation area of the roller 1 is attached. In the upper rotation region, since the outer peripheral wall of the roller 1 generates heat by vaporization and evaporation of the heat medium 14, the sheet 19
Is heated by the heat and softened, and the pattern engraved on the surface of the roller 1 is transferred to the sheet 19.

Subsequently, the transferred sheet 19 reaches a cooling area which is a lower rotation area of the roller 1. Here, the cooling fins 16 of the extension jacket chamber 15 are immersed in the coolant 18, and the heat medium 14 flows from the jacket chamber 12 into the jacket chamber 11 by gravity, so that the heat medium 14 is vaporized and evaporated. The outer peripheral wall of the roller 1 is cooled. Therefore, the sheet 1 is cooled and hardened. After passing through the cooling area of the roller 1, the cooled sheet 19 is separated from the roller 1 and taken up by a required roller.

[0019]

As described above, according to the present invention, when a pattern or the like is transferred to a sheet by using a roller that generates heat, a cooling region is formed in a part along the circumferential wall of the roller. Such an effect that the transferred pattern is deformed or loses its shape can be reliably avoided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a part of FIG.

FIG. 3 is a cross-sectional view of the roller of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roller 3 Drive shaft 6 Electromagnetic induction heating mechanism 7 Induction coil 11 1st jacket room 12 2nd jacket room 13 Communication hole 14 Heat medium 15 Extension jacket room 17 Cooling room 18 Refrigerant 19 Sheet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A Hei 1-79297 (JP, U) JP-A 60-44393 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H05B 6/14 B29C 59/04 D02J 13/00 D21G 1/02 F16C 13/00

Claims (1)

(57) [Claims] A roller that is rotatably driven; and an electromagnetic induction heating mechanism that is provided inside the roller and causes the roller to generate heat, wherein a thermoplastic sheet is in contact with a peripheral surface of the roller, In an induction heating roller device for transferring a pattern or the like engraved on the peripheral surface of a roller to the sheet, the peripheral wall of the roller extends along the axial direction thereof,
A plurality of first and second jacket chambers arranged along a circumferential direction of the roller are provided on an outer peripheral side and an inner peripheral side of the roller, and the first and second jacket chambers are individually communicated. And a gas-liquid two-phase heat medium is enclosed inside,
Further, an extension jacket chamber communicating with an end of the first jacket chamber on the outer peripheral side of the roller is provided, and a lower rotation area of the roller from the time when the sheet is transferred by the roller until the sheet is separated from the roller. And a cooling mechanism for cooling the extension jacket chamber.