JP4703966B2 - Method of carrying base material into heat treatment furnace and heat treatment furnace - Google Patents

Description

  The present invention relates to a method for carrying a substrate into a heat treatment furnace and a heat treatment furnace.

Conventionally, when a sheet-like base material is carried into a heating chamber of a heat treatment furnace and heat treatment is applied to a thermosetting paint coating layer formed on the surface of the base material, Is often wound around a plurality of guide rolls, and the substrate is conveyed so as to draw a meandering conveyance locus (see, for example, Patent Document 1). This is for ensuring the heat treatment time of the substrate without lengthening the heat treatment furnace.
JP-A-8-267567 (FIG. 1)

However, in the configuration as described above, in order to suppress the generation of wrinkles of the base material due to the atmospheric temperature gap at the time of carrying the base material into the heat treatment furnace, the base material is quickly wound around the guide roll and transported by stretching it. In spite of this, wrinkles may occur on the substrate.
The present invention has been made in view of the above circumstances, and a method for carrying a substrate into a heat treatment furnace capable of suppressing generation of wrinkles of the substrate due to an atmospheric temperature gap inside and outside the heat treatment furnace and a temperature gap between the substrate and the guide roll, A heat treatment furnace is provided.

  As a means for solving the above problems, the inventors of the present invention have examined the cause of the occurrence of the wrinkles, and the surface opposite to the surface on which the coating layer of the base material is formed on the guide roll heated in the heating chamber is It has been found that one of the major factors is that the base material adsorbs to the guide roll and makes it difficult to slip upon contact. On the other hand, it was also found that when the dried coating layer was in contact with the guide roll, the base material was relatively slippery with respect to the guide roll.

That is, the present invention is a method in which a sheet-like base material is carried into a heating chamber of a heat treatment furnace and conveyed so as to be wound around at least one guide roll provided in the heating chamber. In the substrate carrying-in method to the heat treatment furnace when performing the heat treatment on the coating layer formed on the surface of the substrate, the first guide roll provided near the substrate carrying-in portion in the heating chamber, the substrate, The coating layer is initially wound so as to come into contact with the first guide roll, and the first guide roll is a corn cave roll .

  According to this configuration, the base material carried into the heating chamber is quickly wound around the first guide roll in the immediate vicinity of the base material carrying-in part, thereby generating wrinkles of the base material due to the atmospheric temperature gap inside and outside the heat treatment furnace. In addition, the substrate is wound around the guide roll so that the coating layer that is relatively slippery is brought into contact with the substrate, so that the substrate is well adapted to the substrate contact surface of the guide roll and the substrate and the guide Generation | occurrence | production of the wrinkle of the base material by the temperature gap with a roll is suppressed. In addition, since the temperature of a base material rises enough by contacting a 1st guide roll, at the time of subsequent contact with a guide roll, adsorption | suction of the base material by the temperature gap is suppressed.

  At this time, if the first guide roll is configured to be a cone-cave roll having a concave base material contact surface, the steering effect that the concave base material contact surface stretches the base material without wrinkles is excellent. It is possible to make it.

  Here, the heat treatment furnace having the above configuration is configured to convey the sheet-like base material carried into the heating chamber so as to be wound around at least one guide roll provided in the heating chamber. A first guide roll that is provided in the heating chamber in the vicinity of the substrate carrying-in portion and is wound first, and has a concave shape. It can be said that it is a corn cave roll having a substrate contact surface.

  And if it is the structure which winds the said base material against the said 1st guide roll from below, each guide roll including a 1st guide roll is a comparatively long member, and both ends are supported. Even if it is a thing, since the self-weight bending of such a 1st guide roll is suppressed by winding so that a base material may be pressed from the downward direction, the steering effect of this 1st guide roll is favorable. Can be demonstrated.

  According to the present invention, it is possible to suppress the generation of wrinkles of the base material due to the atmospheric temperature gap inside and outside the heat treatment furnace and the temperature gap between the base material and the guide roll, thereby reducing the occurrence of product defects and improving the yield. it can.

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 method of transporting to the curing furnace 10 in the embodiment described above is to carry the sheet-like base material 3 into the heating chamber 11 of the curing furnace 10 and provide the base material 3 in the heating chamber 11. This is a method for applying heat treatment to the coating layer formed on the surface of the base material 3 while being wound around each of the guide rolls 14 and 15, and bringing the base material into the heating chamber 11. The base material 3 is first wound around a first upper guide roll 14A provided in the immediate vicinity of the portion 17, and the coating layer is brought into contact with the first upper guide roll 14A.

  According to this configuration, the base material 3 carried into the heating chamber 11 is quickly wound around the first upper guide roll 14 </ b> A immediately adjacent to the base material carry-in part 17, so that the ambient temperature inside and outside the curing furnace 10 is increased. Generation of wrinkles of the base material 3 due to the gap is suppressed, and the base material 3 is wound around the first upper guide roll 14 </ b> A so that a relatively slippery coating layer is brought into contact with the base material 3. Is well adapted to the base material contact surface of the first upper guide roll 14A, and the occurrence of wrinkles of the base material 3 due to the temperature gap between the base material 3 and the guide roll is suppressed. In addition, since the temperature of the base material 3 rises sufficiently by coming into contact with the first upper guide roll 14 </ b> A, adsorption of the base material 3 due to the temperature gap is suppressed during subsequent contact with the guide rolls 14 and 15. Is done.

  That is, generation of wrinkles of the base material 3 due to the atmospheric temperature gap inside and outside the curing furnace 10 and the temperature gap between the base material 3 and the first upper guide roll 14A can be suppressed, thereby reducing product defects and improving yield. There is an effect that can be made.

  At this time, since the first upper guide roll 14A is configured as a cone cave roll having a concave base material contact surface, the steering effect that the concave base material contact surface extends the base material 3 without wrinkles. Can be exhibited satisfactorily.

  Here, the curing furnace 10 having the above configuration conveys the sheet-like base material 3 carried into the heating chamber 11 so as to be wound around the guide rolls 14 and 15 provided in the heating chamber 11. However, it heat-treats the coating layer formed on the surface of the base material 3 and is provided in the heating chamber 11 in the vicinity of the base material carry-in portion 17 and the base material 3 is first wound. It can be said that one upper guide roll 14A is a cone-cave roll having a concave base material contact surface.

  And if it is the structure which winds so that the base material 3 may be pressed against the 1st upper stage side guide roll 14A from the downward direction, each guide roll 14 and 15 containing 14A of 1st upper stage side guide rolls will be comparatively long. Even if it is a member of this type and supported at both ends, such a self-weight deflection of the first upper guide roll 14A is suppressed by being wound so that the base material 3 is pressed from below. The steering effect of the first upper guide roll 14A can be satisfactorily exhibited.

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. Further, for example, a partition wall may be provided for each part, and the temperature condition may be set to control the heat treatment condition, and the number of parts may be three or more.
Further, if the first upper guide roll 14A is not supported at both ends but is supported over its entire length or at the center, the base material 3 may be wound so as to be pressed from above. .
Furthermore, it is of course better if the guide rolls 14 and 15 after the first upper guide roll 14A are also corn cave rolls, but straight rolls are relatively inexpensive compared to corn cave rolls. Therefore, the facility cost can be reduced by using only the first upper guide roll 14A as the corn cave roll.
Here, the base material carry-in part 17 is provided at a position that is substantially the same height as the lower stage guide roll 15, and the base material 3 is first placed on the first lower stage guide roll 15 provided in the immediate vicinity of the base material carry-in part 17. If it is the structure wound around, the 1st lower stage side guide roll 15 will be made into a cone cave roll.
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)
11 Heating chamber 14 Upper guide roll (guide roll)
14A First upper guide roll (first guide roll)
15 Lower guide roll (guide roll)
17 Substrate carry-in part

Claims (3)

A sheet-like base material is carried into a heating chamber of a heat treatment furnace, and the base material is formed on the surface of the base material while being conveyed so as to be wound around at least one guide roll provided in the heating chamber. In the method of carrying the substrate into the heat treatment furnace when performing heat treatment on the coated layer,
While winding the base material first so that the coating layer is in contact with the first guide roll, the first guide roll provided in the heating chamber in the immediate vicinity of the base material carry-in part,
The method for carrying a substrate into a heat treatment furnace, wherein the first guide roll is a corn cave roll.   The method of carrying a substrate into a heat treatment furnace according to claim 1, wherein the substrate is wound by pressing the substrate onto the first guide roll from below. Heat-treating the coating layer formed on the surface of the substrate while conveying the sheet-like substrate carried into the heating chamber so as to be wound around at least one guide roll provided in the heating chamber In the heat treatment furnace for applying
A first guide roll that is provided in the heating chamber in the immediate vicinity of the substrate carrying-in portion and is wound first is a cone cave roll, and the substrate is the first guide roll. A heat treatment furnace wound so as to contact the coating layer .

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