JP4780922B2 - Heat treatment furnace and coating sheet manufacturing method - Google Patents

Description

  The present invention relates to a heat treatment furnace for performing heat treatment on a coated sheet.

Conventionally, as a heat treatment furnace for performing heat treatment on a coating layer of a thermosetting paint formed on the surface of a sheet-like base material, slit-like shapes in a base material carry-in portion and a base material carry-out portion into a heating chamber There is one configured to adjust the slit interval of the opening so as to increase or decrease the gap between the opening and the base material according to the product (for example, refer to Patent Document 1). This is for the purpose of suppressing the blowing of heated air from the base material carry-in part and the base material carry-out part due to a temperature difference between the inside and outside of the heating chamber.
JP 2004-27414 A

However, in consideration of the shake of the conveyed substrate, a minimum gap is required between the opening and the substrate, and heated air in the heating chamber is blown out from such a gap. Then, there is a problem that not only the equipment to be controlled near room temperature (room temperature) outside the heating chamber is heated, but also the equipment and the like are soiled by the volatile substances from the base material and the paint contained in the heated air.
The present invention has been made in view of the above circumstances, and provides a heat treatment furnace capable of effectively suppressing the blowing of heated air in the heating chamber from the substrate carry-in portion and the substrate carry-out portion.

As means for solving the above-described problem, the present invention provides a heat treatment furnace for heat treatment of the sheet substrate carried into the heating chamber to the conveyor while being coated layer formed on the surface of the substrate, wherein the heating chamber A base material carrying-in part for carrying in the base material and a base material carrying-out part for carrying out the base material from the heating chamber, wherein a suction device is provided in which a suction duct is arranged at a site outside the heating chamber , and the base material However, the base included in the heated air is transferred to the suction duct disposed on the lower surface side of the base material so as to pass through the base material carry-in part and the base material carry-out part with both surfaces thereof as substantially upper and lower surfaces. Provided is a heat treatment furnace provided with a trap for capturing volatile components from the material and the coating layer .
In addition, the present invention is characterized in that a heat treatment is performed on the coating layer formed on the surface of the base material using the heat treatment furnace described above while transporting the sheet-like base material carried into the heating chamber. A method for producing a coated sheet is provided.

  According to the present invention, since it is possible to effectively suppress the blowing out of the heated air from the substrate carry-in portion and the substrate carry-out portion, even if there is equipment to be controlled at room temperature outside the heating chamber, a separate heat guard is provided. It is possible to simplify the equipment configuration by eliminating the need for heat countermeasures such as provision. Moreover, since the contamination of the equipment or the like due to the volatile substances contained in the heated air can be suppressed, the yield can be improved by preventing the occurrence of product defects due to the volatile substances adhering to the substrate.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic side view of a coating machine 1 in this embodiment. As shown in this figure, the coating machine 1 is, for example, a cellulose-based resin, an olefin-based resin, or a norbornene-based roll wound around an unwinder 2. The sheet-like base material 3 made of a material such as a resin is unwound using a plurality of transport rolls 4 and the like, and the base material 3 is wound on the surface of the winder 3 after being continuously transported. 5 to rewind. In addition, the arrow F in each figure including FIG. 1 shows the conveyance direction (direction substantially orthogonal to the substrate width direction) of the substrate 3.

  The coating process on the base material 3 includes an application process in which a desired coating liquid such as a paint (hereinafter simply referred to as a paint) is applied to the surface of the base material 3 by the applicator roll 6 and the like. This is a drying process in which the applied paint is dried by the drying device 8 and a heating process in which the paint is thermally cured by a curing furnace (heat treatment furnace) 10 after the paint is dried. Here, the coating material applied to the substrate 3 is, for example, a thermosetting coating material such as acrylic, epoxy, or silane. The substrate 3 that has been subjected to the coating treatment is appropriately wound and wound around a winder 5 to be commercialized.

A metering roll 7 that can be moved close to and away from the applicator roll 6 is provided at a site adjacent to the applicator roll 6, and the applicator roll 6 cooperates with the applicator roll 6 and the metering roll 7. 6 is transferred to the substrate surface (lower surface), that is, a coating layer having a predetermined thickness is formed on the substrate surface.
The base material 3 to which the coating material has been applied is changed so that the transport path is folded upward, so that the surface of the base material on which the coating layer is formed is turned upside down. It is conveyed into the drying device 8. Hot air is appropriately supplied into the drying device 8, and the coating layer of the substrate 3 is dried by the hot air.

  After the coating layer is dried, the base material 3 is carried into the heating chamber 11 of the curing furnace 10 and is subjected to a heat treatment at a predetermined high temperature while passing through the heating chamber 11. . The internal space of the heating chamber 11 is partitioned into an upper part 12 and a lower part 13 (see FIG. 2), and the base material 3 is carried into the heating chamber 11 from the left side of the upper part 12 in the drawing. After passing through the upper part 12, the base material 3 passes through the lower part 13 and is then carried out of the heating chamber 11 from the right side of the lower part 13 in the figure.

  In the heating chamber 11, an upper stage guide roll (guide roll) 14 and a lower stage guide roll (guide roll) 15 that extend in the width direction of the base material 3 for each of the parts 12 and 13 are arranged in a substantially horizontal direction. A plurality of the guide rolls 14 and 15 are wound around each of the guide rolls 14 and 15, and the base material 3 meanders so as to reciprocate along the substantially vertical direction in each of the parts 12 and 13. It is transported while drawing the transport trajectory. This is to ensure a heat treatment time for the coating layer without lengthening the curing furnace 10.

  As shown in FIG. 2, the atmosphere temperature of the upper part 12 and the lower part 13 in the heating chamber 11 of the curing furnace 10 is maintained at (about 100 to 150 ° C.). Here, the air in the heating chamber 11 is sequentially ventilated by intake and exhaust ducts (not shown) for each part, maintaining the atmospheric temperature corresponding to each region, and removing volatile substances from the substrate 3 and the paint. Has been made to produce good heated air. In the following description, the upstream side in the substrate conveyance direction may be simply referred to as the upstream side, and the downstream side in the substrate conveyance direction may be simply referred to as the downstream side.

  The upper guide roller 14 and the lower guide roller 15 provided for each part 12, 13 are arranged in a staggered manner on the upper side and the lower side, for example, eight or nine for each part. . By appropriately winding the base material 3 around each of the guide rolls 14 and 15, the transport path of the base material 3 can be set to a desired one.

  Thus, by setting the conveyance path of the base material 3 for each part, the passage time of the base material 3, that is, the heat treatment time can be adjusted, and it becomes possible to perform the optimal heat treatment for the base material 3 and the paint. ing.

  A base material carry-in portion 17 into the heating chamber 11 is provided on the left side wall in the figure of the curing furnace 10. This base material carrying-in part 17 has a slit-like opening 17a that is long in the base material width direction, and allows the base material 3 to be carried in from the opening 17a. The base material carry-in part 17 is provided at a position substantially the same height as the upper stage guide roll 14 in the upper part 12, and the base material 3 carried into the heating chamber 11 from the base material carry-in part 17 is an upper stage guide. Each of the guide rolls 14, so as to draw a predetermined transport trajectory after being first wound around a first upper guide roll 14A (first guide roll) provided in the immediate vicinity of the substrate carry-in portion 17 of the roll 14, 15 are sequentially wound.

  On the other hand, a base material carry-out portion 18 from the inside of the heating chamber 11 is provided on the right side wall in the figure of the curing furnace 10. Similarly to the base material carry-in portion 17, the base material carry-out portion 18 also has a slit-like opening 18a that is long in the base material width direction, and the base material 3 can be carried out from the opening 18a. The base material carry-out portion 18 is provided at a position that is substantially the same height as the lower-stage guide roll 15 in the lower part 13, and is wound around the final lower-stage guide roll 15Z provided in the immediate vicinity of the base material carry-out portion 18. Later, the substrate 3 is carried out of the heating chamber 11.

  The base material 3 carried into the heating chamber 11 from the base material carry-in part 17 is wound so as to be pressed against the first upper guide roll 14A from below, and then the second upper stage adjacent thereto. After being wound around the side guide roll 14 </ b> B so as to be pressed from above, it moves downward and is wound around the lower stage guide roll 15. Thereafter, the base material 3 is alternately wound around the upper guide roll 14 and the lower guide roll 15, thereby drawing a meandering conveyance path so as to reciprocate along the substantially vertical direction as described above. Be transported.

  Here, in the present embodiment, the base material 3 is carried into the heating chamber 11 from the base material carry-in portion 17 with the surface on which the coating layer is formed facing up, that is, the surface on which the coating layer is formed. Therefore, the base material 3 wound so as to be pressed from below onto the first upper guide roller 14A has an application layer on the base material contact surface (outer peripheral surface) of the first upper guide roll 14A. It can be said that it is wound so as to be in contact.

  Further, as shown in FIG. 3, the first upper guide roll 14A is a concave base material contact formed so as to be gradually depressed toward the radially inner side as it is located on the center side with respect to both sides thereof. It is a so-called corn cave roll having a surface. That is, the first upper guide roll 14A exhibits a steering effect of conveying the base material 3 while stretching the base material 3 in its own axis C direction. In addition, in this embodiment, each of the other guide rolls 14 and 15 except the first upper guide roll 14A extends in the same cross section along the axis to form a straight base material contact surface. It is said.

  By the way, as shown in FIG. 2, the base material carry-in portion 17 and the base material carry-out portion 18 are each provided with a suction device 20 in which a pair of suction ducts 21 are arranged on the outside of the heating chamber 11. Hereinafter, the suction device 20 provided in the base material carry-in part 17 will be described as a representative with reference to FIG. 2. Each suction duct 21 has the base material 3 passing through the base material carry-in part 17 in the vicinity of the upper and lower surfaces thereof. It is arranged as if sandwiched from. Such a suction duct 21 is provided so as to extend over the entire length of the slit-shaped opening 17a in the base material carrying-in portion 17, and is likely to blow out from the inside of the heating chamber 11 to the outside due to a temperature difference between the inside and outside of the heating chamber 11. The heated air can be sucked.

  Here, inside the suction duct 21 disposed on the lower surface side of the base material 3, a trap 22 capable of trapping volatile components from the base material 3 and the coating layer contained in the heated air is provided. The trap 22 is made of, for example, a metal punching mesh plate (perforated plate). By passing the sucked heated air, the volatile substances from the base material 3 and the paint contained in the air are attached, that is, captured. To do. In addition, since the suction device 20 provided in the base material carrying-out part 18 also has the same configuration, the description thereof is omitted.

  As described above, the curing furnace 10 in the above embodiment performs the heat treatment on the coating layer formed on the surface of the base material 3 while conveying the sheet-like base material 3 carried into the heating chamber 11. A suction device 20 is provided in which a suction duct 21 is arranged in the vicinity of the base material carry-in portion 17 and the base material carry-out portion 18 into the heating chamber 11.

  According to this configuration, the heated air in the heating chamber 11 that is about to blow out from the openings 17a and 18a of the substrate carry-in portion 17 and the substrate carry-out portion 18 is sucked through the suction duct 21 arranged in the vicinity thereof. By being directly sucked by 20, the blowing of the heated air from the base material carry-in part 17 and the base material carry-out part 18 can be effectively suppressed.

  Thereby, even if there is equipment to be controlled at room temperature outside the heating chamber, there is an effect that it is possible to simplify the equipment configuration without requiring a heat countermeasure such as providing a separate heat guard. In addition, since contamination of the equipment or the like due to the volatile substance contained in the heated air can be suppressed, there is an effect that the yield can be improved by preventing the occurrence of product defects due to the volatile substance adhering to the substrate 3.

  At this time, the suction duct 21 is configured to be provided as a pair so as to sandwich the base material 3 that passes through the base material carry-in part 17 or the base material carry-out part 18 from both sides thereof. Even if the openings 17a and 18a of the base material carry-in portion 17 and the base material carry-out portion 18 are formed in a slit shape that is long in the base material width direction so as to pass through, heated air that is about to blow out from the openings 17a and 18a Can be sucked evenly in the substrate width direction.

  Furthermore, the base material 3 is conveyed so that both surfaces thereof are substantially upper and lower surfaces and passes through the base material carry-in part 17 and the base material carry-out part 18, and the suction duct 21 disposed on the lower surface side of the base material 3 If the trap 22 for capturing the volatile components from the base material 3 and the coating layer contained in the heated air is provided, cleaning can be facilitated as compared with the case where the trap is provided in the exhaust path of the suction device 20. In addition, since the trap 22 is provided only in the suction duct 21 disposed on the lower surface side of the base material 3, it is possible to prevent the volatile component accumulated in the trap 22 from adhering to the base material 3 due to dropping or the like. Here, it goes without saying that it is preferable to adopt a piping configuration in which the heated air sucked by the suction duct 21 arranged on the upper surface side of the base material 3 is also passed through the trap 22.

In addition, this invention is not restricted to the said Example, For example, the cure furnace 10 may have a two-story structure or a three-story structure or more.
Moreover, the curing furnace of the structure conveyed so that the base material 3 may follow the width direction, for example to an up-down direction may be sufficient, and in such a case, the suction provided so that the base material 3 may be pinched | interposed from both surfaces A trap may be provided for each duct.
Furthermore, the structure by which each intake duct 21 is distribute | arranged to the site | part inside the heating chamber 11 of the base material carrying-in part 17 and the base material carrying-out part 18 may be sufficient.
And although it demonstrated as a curing furnace in the said Example, it is not limited to this, Of course, it can be set as various heat processing furnaces, The structure in the said Example is an example, The summary of invention is shown. It goes without saying that various changes can be made without departing from the scope.

It is a schematic side view of the coating machine in the Example of this invention. It is a side view which shows the curing furnace of the said coating machine. It is a front view of a 1st upper stage side guide roll.

Explanation of symbols

3 Base material 10 Cure furnace (heat treatment furnace)
DESCRIPTION OF SYMBOLS 11 Heating chamber 17 Base material carrying-in part 18 Base material carrying-out part 20 Suction device 21 Suction duct 22 Trap

Claims (2)

In a heat treatment furnace for carrying out a heat treatment to the coating layer formed on the surface of the base material while conveying the sheet-like base material carried into the heating chamber,
A base material carry-in portion for carrying the base material into the heating chamber and a base material carry-out portion for carrying out the base material from the heating chamber, wherein a suction device is provided in which a suction duct is arranged at a site outside the heating chamber. ,
The base material is transported so that both surfaces thereof are substantially upper and lower surfaces and pass through the base material carry-in portion and the base material carry-out portion, and is included in the heated air in the suction duct arranged on the lower surface side of the base material A heat treatment furnace characterized in that a trap for capturing volatile components from the substrate and the coating layer is provided . 2. A coated sheet, wherein a heat treatment is applied to the coating layer formed on the surface of the substrate while conveying the sheet-like substrate carried into the heating chamber using the heat treatment furnace according to claim 1. Manufacturing method.

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