JPH06115038A - Production of laminated material - Google Patents

Abstract

PURPOSE:To perform a process from the coating of laminating members with an adhesive to the completion of a laminated material within a short time without deforming a surface material or the like by heat in the production of the laminated material used in a door panel such as a fireproof door, a partitioning material, a wall material, the top plate of a desk or a blackboard. CONSTITUTION:In the production of a laminated material by the lamination of a plurality of laminating members, a humidity curable hot-melt adhesive is used in the mutual bonding of laminating members and applied to the surface of at least one laminating member (#12) and the other laminating member is superposed on the coated laminating member to form a laminated material (#14) and this laminated material is preheated (#15) to be subjected to hot press (#16) at temp. higher than the m.p. of the hot melt adhesive but lower than the thermal deformation temp. of the laminated material and this pressed laminated material is subjected to cold press (#17).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing various laminated materials such as door panels such as fireproof doors, partitioning materials, wall materials, desk top plates, and blackboards with an adhesive.

[0002]

2. Description of the Related Art Conventionally, a solvent volatilization type or a chemical reaction type adhesive has been used in order to manufacture a laminated material by adhering a plurality of laminated members, and in particular, an epoxy two-component adhesive is used. Many are used.

The epoxy-based two-component adhesive requires a mixing / stirring process for mixing the main agent and the curing agent, and the curing time or curing period is long. Therefore, for example, in a conventional door panel manufacturing line, it takes ten or more hours at room temperature for the adhesive applied between the laminated members to harden, so the door panels after applying the adhesive are stacked in a number of stages. Is 0.5 kg /
It was supposed to be left for 1 to 2 days in a state of being pressed so as to be applied with a pressure of a square centimeter.

[0004]

Therefore, it takes a lot of days and space to apply the adhesive to the laminated member and complete the laminated member, and it is difficult to automate the manufacturing line of the laminated member. It was a bottleneck for improving productivity.

Therefore, it is conceivable to use a moisture-curable hot-melt adhesive as the adhesive. However, when a hot-melt type adhesive is used, the influence of heat on the laminated member (adhered material or surface material) poses a problem.

That is, generally, when a hot melt type adhesive is used, the melting point (melting point) is 12
Use hot press at 180-180 ℃
Cold press 60 ℃ by setting the temperature above ℃
This is done according to the temperature setting. Therefore, such a high temperature may deform the adherend or the surface material.

For example, in the above-mentioned door panel manufacturing, a frame, a honeycomb or the like is sandwiched and adhered between two door plates made of steel plates, but a vinyl chloride sheet for makeup is used as a surface material on the outer surface of the door plate. Often attached as. In that case, 1 hot press
If done at about 80 ° C, the vinyl chloride sheet will melt and deform,
Alternatively, there is a problem that the wrinkles attached to the vinyl chloride sheet are lost and the product is not a product.

In view of the above-mentioned problems, the present invention can perform a process from application of an adhesive to a laminated member to completion as a laminated material in a short time, and a laminated material in which a surface material is not deformed by heat. It is intended to provide a method for manufacturing a material.

[0009]

A method of manufacturing a laminated material according to the invention of claim 1 is a method of manufacturing a laminated material by laminating a plurality of laminated members in order to solve the above-mentioned problems. A moisture-curable hot-melt adhesive is used to bond the laminated members to each other, the hot-melt adhesive is applied to the at least one laminated member, and then another laminated member is laminated to form a laminated body, and the laminated body is laminated. Preheat the body,
The pre-heated laminate is hot-pressed at a temperature higher than the melting point of the hot melt adhesive and lower than the temperature at which thermal deformation of the laminate member occurs, and the hot-pressed laminate Cold press against.

In the method for producing a laminated material according to the second aspect of the present invention, the melting point of the hot melt adhesive is in the range of 50 to 60 ° C, and the temperature of the hot press is in the range of 70 to 80 ° C. Is set.

[0011]

The laminated members are adhered to each other by solidifying and hardening the moisture-curable hot-melt adhesive. The melting point of the hot melt adhesive is, for example, 50 to
The temperature is set as low as 60 ° C., and hot pressing is performed in the range of 70-80 ° C., for example. Since the preheating is performed, the hot pressing in the range of 70 to 80 ° C. causes the adhesive to reach the melting point or higher and penetrate into the laminated member and solidify by cold pressing.

[0012]

FIG. 5 is a view showing an example of a door panel W manufactured by the method of the present invention. 5A is a partially sectional front view of the door panel W, and FIG. 5B is an enlarged sectional side view of the door panel W.

The door panel W is composed of two rectangular door plates w1 and w1 made of steel plates, a frame w2 made of steel and sandwiched between the door plates w1 and a honeycomb w3. A vinyl chloride sheet CS having a grain is laminated as a surface material on the outer surface of the door plate w1. There are various external dimensions of the door plate w1 and the thickness dimension of the frame w2, and the door plate w1 may be divided into a plurality of parts depending on the specifications of the door panel W such as a case with a mail box. is there.

The door panel W is a moisture-curable hot-melt adhesive AH applied to the inner surface of each door plate w1.
(Hereinafter, referred to as "adhesive AH") and is integrated. The adhesive AH is heated to a melting point (melting point) or higher after application and then cooled to obtain the same initial adhesive strength as a normal hot-melt adhesive, and after a certain period of time, a moisture-curing crosslinking reaction. A strong adhesive force can be obtained.

An example of such an adhesive AH is described in JP-A-63-120785. The adhesive AH used in this example has a melting point of 10 ° C. or higher than the maximum temperature in summer. It is set to have a high temperature. For example, if the room temperature (or the ambient temperature in the factory) is 40 ° C in summer, the melting point is in the range of 50 to 60 ° C (for example, 55 ° C).
It is set to be about 60 degrees at about 70 ° C.
By heating for about a second, it penetrates sufficiently and is solidified by cooling to obtain an adhesive force. That is, the adhesive AH of this example
Has a lower melting point than this type of commonly used adhesive and can be handled at lower temperatures than usual.

FIG. 1 is a plan view showing the structure of a manufacturing line 1 according to the method of the present invention, FIGS. 2 and 3 are side views of a part of the manufacturing line 1, and FIG. 4 is a flow chart showing the manufacturing process by the manufacturing line 1. is there.

The production line 1 is a coating device 1 for the adhesive AH.
1, humidifying device 12, assembly table 13, preheating device 14, hot press device 15, cold press device 16, post-cooling device 17, and a conveyor 21 (conveyors 21a to 21c), a conveyor 22, and a conveyor that connect them. 23 (conveyors 23a and 23b) and the like.

The conveyors 21 and 23 are drive roller conveyors, and the conveyor 22 is an inclined free roller conveyor. The conveyor 21 is provided with photoelectric sensors SE1 and SE2 for detecting the door plate w1.

The process line including the coating device 11 and the humidifying device 12 may be referred to as a coating and humidifying line, and the process lines after the assembly table 13 may be referred to as a heating and cooling line. Coating device 1
No. 1 of the door plate w1 that is carrying the adhesive AH melt-fed from one of the two systems of the melt-pumping devices 31a and 31b through the hose 32 from a number of nozzles arranged downward. The material is discharged onto the upper surface (back surface) and applied to the entire surface.

The melt pumping devices 31a and 31b each include a tank for charging the adhesive AH, a heat source for melting the adhesive AH in the tank, and a pump for pumping the melted adhesive AH. Every time the operating tank of either one of the two systems of melt pumping equipment 31a, 31b becomes empty, the connection of the hose 32 is switched to the other by a valve to continue the operation and The existing tank will be replaced in the meantime.

The humidifying device 12 has a humidifying housing 51 that surrounds the periphery and the upper surface of the door plate w1 above the conveyor 21 to form a humidifying chamber 50. Both sides of the humidifying housing 51 (both sides of the conveyor 21). Mist-like water (for example, warm water of about 80 ° C.) is jetted from the humidifying chamber 50.
The inside is filled with mist, and the adhesive AH applied to the door plate w1 stopped inside the humidifying chamber 50 is humidified. As a result, the moisture curing reaction of the adhesive AH is carried out within 1 to 2 days and the practical strength is reached.

That is, when the humidification is not carried out, the moisture hardening is carried out only by the humidity contained in the outside air, but since the honeycomb w3 portion contains a large amount of the outside air, it is 1 even in the natural state. Although moisture curing is performed in about 2 days, since the frame w2 portion is in close contact with the door plate w1, there is almost no moisture, and in a natural state it takes about one week for moisture curing to be performed. Therefore, by applying moisture by the humidifying device 12, moisture curing is promoted and a strong adhesive force can be obtained in a short period of time.

The humidifying housing 51 has a drainage passage (not shown) for preventing water droplets from falling on the upper surface of the door plate w1 when the inner wall surface of the humidifying housing 51 is condensed due to low outside air temperature. Is provided.

The assembly table 13 has the largest door panel W.
(Laminate Wa) can be placed on the assembly table 1
2 is sequentially conveyed from the conveyor 22 on the 3
This is for assembling the laminated body Wa by the operator overlapping the one door plate w1 and the separately prepared frame w2 and honeycomb w3 as shown in FIG. 5B.

The preheating device 14 blows warm air of about 80 ° C. from above onto the laminated body Wa, and raises the temperature of the laminated body Wa to 40 to 40 before hot pressing the laminated body Wa.
This is for eliminating the variation in temperature when the temperature is raised to about 70 ° C. in advance and hot pressing is performed.

That is, since the vinyl chloride sheet CS having a grain is laminated on the outer surface of the door plate w1, the set temperature in the hot press device 15 should be raised to about 78 ° C. or higher in order to prevent its melting. I can't. However, with this temperature setting, when the preheating is not performed, the temperature distribution of the entire laminated body Wa is about 50 to 80 ° C., and the adhesive AH may not melt in the low temperature portion. In order to prevent this, if preheating is performed to keep the entire temperature of the laminated body Wa at about 40 to 70 ° C., the laminated body Wa becomes about 70 to 80 ° C. at the set temperature in the hot press device 15 described above, The low part of the adhesive AH disappears, and the adhesive AH is completely melted.

The hot press device 15 and the cold press device 16 are composed of a common frame 61 which is integrally formed, a conveyer 62, a hot press main body 63, a cold press main body 64, and the like. An enclosure plate (not shown) for enclosing the cold air sent from the post-cooling device 17 to the press space 65, which will be described later, so as not to escape.

In the hot press machine 15, the temperature of the hot press body 63 is set to about 78 ° C. as described above, and the laminate W is hot-pressed.
When a becomes about 70 to 80 ° C., the adhesive AH melts.

In the cold press device 16, the temperature of the cold press body 64 is set to about 15 to 30 ° C. By performing cold pressing, the laminated body W
The part of the adhesive coated with the adhesive AH is solidified by being cooled to about 30 ° C. However, inside the frame w2, the honeycomb w3, etc., the temperature is higher than that due to insufficient cooling, and there is a possibility that the adhesive AH may be remelted by the returning heat after passing through the cold press device 16. . Therefore, in order to prevent this, post-cooling is performed by the post-cooling device 17 described later.

The conveyer 62 has a resin sheet attached to the surface of the chain for traveling, and is conveyed with the laminated body Wa placed on the resin sheet, and with the traveling stopped. The hot press main body 63 and the cold press main body 64 descend and the respective presses are performed.

It should be noted that the cold press body 64 is lower than room temperature in the summer and remains the laminated body Wa as it is.
Therefore, in order to prevent dew condensation, the cold air used in the post-cooling device 17 in the subsequent process is sent to the press space 65 to cool the stacked body Wa.

The post-cooling device 17 applies cold air of about 10 to 20 ° C. to the surface of the laminated body Wa in order to prevent the adhesive AH from being remelted by the returning heat of the laminated body Wa as described above. Cooling. The post-cooling process by the post-cooling device 17 is necessary in the summer, but the room temperature is, for example, 5 in the winter.
It is not necessary when the temperature falls below about ℃.

The post-cooling device 17 is provided with a cold air duct 83 for collecting the cold air applied to the laminated body Wa and sending it to the press space 65 of the cold press device 16 described above. Next, the manufacturing process of the door panel W will be described together with the operation of the conveyors 21, 22, and 23 with reference to the flowchart of FIG.

At the loading position of the most upstream conveyor 21a, door plates w1 are loaded and loaded one by one with the back side facing upward by a transport device (not shown) or the like (step # 11).

The loaded door plate w1 is conveyed by the conveyor 21a, and the adhesive AH is applied by the coating device 11 during the conveyance (step # 12). At this time, the conveyor 21a is controlled to run or stop according to the detection timing of the door plate w1 by the sensor SE1, so that the adhesive AH is sufficiently applied to the vicinity of the upper and lower edges of the door plate w1 and the overall It is controlled so that it is evenly applied.

The door plate w1 which has finished the coating process is put on standby or conveyed on the conveyor 21b, and the surface coated with the adhesive AH is humidified by the humidifying device 12 (step #
13). At this time, the spraying of the humidifying device 12 is started at the detection timing of the door plate w1 by the sensor SE2.

The door plate w1 which has been subjected to the humidifying step is stopped at an appropriate position after being conveyed by the conveyor 21c, and is lifted by a lift device with a free roller conveyor which is installed at the same position as the conveyor 21c, so that the door plate w1 is conveyed by its own weight. 22 and is stopped by the stopper at the end of the conveyor 22 on the unloading side.

Next, on the assembly table 13, the conveyor 2
An operator assembles the stacked body Wa by stacking the two stacked bodies Wa supplied from No. 2 and the separately-supplied frame w2 and the honeycomb w3 (step # 14). The assembled laminated body Wa is placed on the conveyor 23a by the worker, and is carried into the preheating device 14 by the conveyor 23a.

The laminated body Wa is preheated to about 40 to 70 ° C. by warm air in the preheating device 14 (step # 15), and then in the hot press device 15.
Hot pressed at a temperature of 0 to 80 ° C (Step #
16), the adhesive AH is solidified by cold pressing at about 30 ° C. in the cold pressing device 16 (step # 17).

Then, in the post-cooling device 17, the laminated body Wa is cooled by cold air (step # 18) and is carried out as the door panel W onto the conveyor 23b. The door panel W on the conveyor 23b is carried out to another conveyor, for example, by a hoist (not shown), or carried out on a free roller conveyor (not shown), and parts such as a handle are attached or painting is performed as necessary. Will be completed.

Although not shown, the conveyor 22 and the heating / cooling line are provided in two systems branching from the conveyor 21c, and the door plate w1 which has finished the coating process and the humidifying process is a lift installed in the conveyor 21c. The device distributes the heating / cooling line to any one of these two systems to complete the door panel W.

Further, the door panel W having a shape in which the central portion is recessed
In order to efficiently perform hot pressing, a jig made of a metal plate having good thermal conductivity is fitted in the recessed portion, and the jig is removed and recovered after being carried onto the conveyor 23c. . A conveyor for the recovery is provided between the heating and cooling lines of the two systems (on the extension line of the conveyor 21c).

Therefore, assuming that the carry-in cycle of the door plate w1 onto the conveyor 21a, that is, the operation cycle of the coating and humidifying line is 15 seconds / piece and the operation cycle of each heating / cooling line is 60 seconds / piece, heating of two systems is performed. The completed door panel W can be obtained from the cooling line in a cycle of 30 seconds / piece.

As described above, according to the production line 1 of the present embodiment, the steps of applying the adhesive AH to the door plate w1, the humidifying step, the laminating step, the heating step, and the cooling step are consistently continuous and short. This is done in time, and the productivity is greatly improved. It is also possible to automate the stacking process (assembly process), whereby the whole process is automated.

Since the steps from the insertion of the door plate w1 to the completion of the door panel W are completed in a short time and it is not necessary to stack the door panels W for many days to cure the adhesive AH as in the conventional case, the production cycle and The delivery time can be greatly shortened, and the space and labor can be greatly saved.

Furthermore, since the adhesive AH is automatically applied without using an epoxy-based adhesive, it is possible to prevent contamination by the adhesive, simplify the handling, reduce the work time, and save the labor. The working environment will be improved and safety and health will be improved.

According to the above-mentioned embodiment, the melting point of the adhesive AH is set lower than that of the conventional one so that the melting point of the adhesive AH is in the range of 50 to 60 ° C.
The vinyl chloride sheet CS, which is a surface material, is not thermally deformed because it is sufficiently penetrated and solidified by cooling in an appropriate time in the range of 0 ° C to obtain an adhesive force, and the handling such as temperature control is easy. Is.

According to the above-described embodiment, since the preliminary heating process by the preliminary heating device 14 is provided in the preceding stage of the hot pressing process, the temperature variation in the laminated body Wa when the hot pressing is performed is reduced, and the laminated body Wa is laminated. Even if the set temperature of the hot press is lowered to prevent the deformation of the vinyl chloride sheet CS on the outer surface of the body Wa, the adhesive AH is completely melted and sufficiently penetrates into the adherend, and the door panel has excellent strength and durability. W can be manufactured.

According to the above-mentioned embodiment, since the cooling process by the post-cooling device 17 is provided after the cold pressing process, there is no possibility that the adhesive AH is remelted by the returning heat inside the laminated body Wa.

In the above embodiment, the preheating device 1
Although heating with warm air was performed in No. 4, heating with infrared rays or the like is also possible. Structure of production line 1
The configuration, structure, method, shape, temperature, contents of the flowchart, and the like of the apparatus in each process of the production line 1 can be variously changed other than those described above.

The present invention can be applied to the manufacture of various laminated materials such as a door panel having a structure or shape different from that of the above door panel W, a partition material, a wall material, a desk top plate, a blackboard and the like.

[0052]

According to the present invention, the process from application of the adhesive to the laminated member to completion of the laminated member can be carried out in a short time, and the surface member is not deformed by heat. A method can be provided.

According to the second aspect of the present invention, even when the laminated member is, for example, a vinyl chloride sheet laminated as a surface material, the laminated material can be manufactured without thermally deforming the vinyl chloride sheet.

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a production line according to a method of the present invention.

FIG. 2 is a side view of a part of the production line.

FIG. 3 is a side view of a part of the production line.

FIG. 4 is a flowchart showing a manufacturing process by a manufacturing line according to the method of the present invention.

FIG. 5 is a diagram showing an example of a door panel manufactured by the method of the present invention.

[Explanation of symbols]

 1 Production line W Door panel (laminated material) Wa Laminated body w1 Door plate (laminated member) w2 Frame (laminated member) w3 Honeycomb (laminated member) CS Vinyl chloride sheet (laminated member) AH Adhesive (hot melt adhesive)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoshiaki Ohno 3-9-2 Nihonbashi, Chuo-ku, Tokyo Inside Jatec Co., Ltd.

Claims (2)

[Claims] 1. A method for producing a laminated material by laminating a plurality of laminated members, wherein a moisture-curable hot melt adhesive is used for joining the laminated members to each other, and the hot melt adhesive is After applying to at least one laminated member, another laminated member is overlaid to form a laminated body, and the laminated body is preheated, and the preheated laminated body is coated with a hot melt adhesive. A method for producing a laminated material, characterized in that hot pressing is performed at a temperature higher than a melting point and lower than a temperature at which thermal deformation of the laminated member occurs, and cold pressing is performed on the hot pressed laminated body. . 2. The method for producing a laminated material according to claim 1, wherein a melting point of the hot melt type adhesive is in a range of 50 to 60 ° C., and a temperature of the hot press is in a range of 70 to 80 ° C.