JPH0477237A - Manufacture of laminate - Google Patents

Abstract

PURPOSE:To reduce the heating time at the lamination of synthetic resin sheet to a body to be laminated and contrive to accelerate the cycling speed of the entire process by a method wherein the preheating process of the synthetic resin sheet is added to the conventional method for laminating the synthetic resin sheet to the body to be laminated. CONSTITUTION:Both the upper and lower surfaces of synthetic resin sheet 13 taken up in roll re preheated up to the desired temperature such as 100 - 200 deg.C at a preheating zone 2 by the heating source 23 in a preheating oven 20. After that, the preheated synthetic resin sheet 31 is transferred to a press zone or a continuous former 1. By releasing a vacuum chamber 11, which is not on the side belonging to a body to be laminated, to the atmosphere after the synthetic resin sheet 31 is heated up to the desired temperature, the softened synthetic resin sheet 31 is pushed out by the atmosphere toward the side belonging to the body 15 to be laminated so as to cover and laminate the surface of the body 15 to be laminated. After that, both the vacuum chambers 11 and 12 are pated from the sheet through the actuation of actuators so as to take the body to be laminated, onto which the synthetic resin sheet 31 is laminated, out of the vacuum chambers in order to transfer the body 4 to downstream side and set a new body 15 to be laminated in the vacuum chamber 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to the use of synthetic resin sheets having beautiful printed patterns, etc., or synthetic resin sheets for performing special industrial functions, to objects having undulations on the surface. The present invention also relates to a manufacturing method for manufacturing a laminate that can be laminated well on the surface of an object to be laminated such as a container, has a high commercial value, and is suitable for industrial use.

[Conventional technology]

Conventionally, synthetic resin sheets have often been laminated on objects to be laminated for the purpose of decorating the surfaces of furniture, audio equipment, etc. or imparting functions, and many methods have been proposed. Among them, Unexamined Japanese Patent Publication No. 1983-
An overlay method such as that shown in No. 132,675 is recommended. In this method, first, a synthetic resin sheet and a laminated body are placed facing each other in a vacuum container, and the vacuum chamber in the vacuum container is divided into two by the synthetic resin sheet. Both vacuum chambers are each equipped with a vacuum suction valve and an atmosphere release valve. Then, both vacuum chambers are evacuated by the re-vacuum suction valve, and the synthetic resin sheet is heated and softened by the radiant heat source inside the vacuum container. Thereafter, the vacuum chamber that is not on the side of the laminated body is opened to the atmosphere.

Then, the softened synthetic resin sheet is pushed by the atmosphere and coated on the object to be laminated to be laminated.

[Invention or problem to be solved]

However, in the conventional technology, the only heating means for heating and softening the synthetic resin sheet is a radiant heat source disposed facing the synthetic resin sheet.
Since only one side of the synthetic resin sheet is heated,
There is no problem if the synthetic resin sheet is thin, but if the synthetic resin sheet is thick, it must be heated sufficiently from the sheet surface on the heat source side to the sheet surface opposite to the heat source to the temperature required for processing. Not only is it time consuming, but
Furthermore, it is virtually impossible to heat the film at a uniform temperature in the thickness direction. This poses a problem in that the heating surface may overheat before it is sufficiently heated to the extent that it is not heated.

Furthermore, in recent years, synthetic resin foam has been required to be laminated onto objects to be laminated, but because the thermal conductivity of synthetic resin foam is low, it is difficult to use the conventional method described above in a satisfactory manner. I couldn't do it.

The present invention solves the problems of the above-mentioned conventional techniques, and provides a laminating method that allows even thick synthetic resin sheets, foamable synthetic resin sheets, etc. to be laminated on objects to be laminated in a fully satisfactory manner. is intended to provide.

[Means to solve the problem]

In order to achieve the above object, the present invention arranges a synthetic resin sheet and a laminated body facing each other in a vacuum container,
The vacuum chamber in the vacuum container is airtightly divided into two by the synthetic resin sheet placed above, and a radiant heat source is placed on the side of the vacuum chamber that is not on the side of the objects to be laminated, facing oppositely to the objects to be laminated through the synthetic resin sheet. After the synthetic resin sheet is heated and softened, the vacuum system is released only in the vacuum chamber that is not on the side of the object to be laminated, and the synthetic resin sheet is coated on the object to be laminated. The purpose of the present invention is to develop and provide a method of preheating the material outside the vacuum container and then sending it into the vacuum container.

Alternatively, the vacuum container can be split into two parts, and the second
It is also possible to sandwich a synthetic resin sheet between the divided vacuum containers so that the vacuum chamber is divided into two by the synthetic resin sheet.

Preheating may be performed using a heating furnace with a radiant heat source such as a far-infrared heater, or may be performed using a heating furnace such as a so-called hot plate press in which the plywood resin sheet is sandwiched from the upper and lower surfaces between preheated hot plates. It can also be done by means.

[For production]

In the present invention, since the synthetic resin sheet can be preheated in advance and the temperature of the synthetic resin sheet can be raised uniformly to a predetermined temperature in a short time, in the step of coating the object to be laminated, It becomes possible to shorten the time required for the synthetic resin sheet to be sufficiently heated and softened.

Furthermore, by preheating the synthetic resin sheet in advance, it becomes easy to heat the entire sheet to a desired temperature while preventing overheating on the heating surface side, even in the case of thick or foamable synthetic resin sheets.

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 1 shows a first embodiment of the present invention, and in the figure, a continuous molding machine 1 has a vacuum container 11 and 12 divided into two, and each vacuum container has a A non-vacuum suction valve and an atmosphere release valve are provided. The vacuum containers 11 and the workpieces 2 are configured to move toward and away from each other by hydraulic actuators P and P' fixed to a machine frame (not shown).

Further, in the figure, an appropriate radiant heat source 13 and a heat reflecting plate 13' are attached to the upper vacuum vessel 11. Further, in the lower vacuum container 12, a stacked body I5 is disposed while being supported by an appropriate vertical movement means (not shown).

In the present invention, a preheating zone 2 is formed upstream of the continuous molding machine 1. The preheating zone 2 has a heating furnace 20 having an upper heating chamber 21 and a lower heating chamber 22, and the re-extraction chambers 21 and 22 are equipped with an infrared heater, such as an infrastein heater or a lamp-type heater using a quartz tube. A heating source 23 is provided.

In this embodiment, the upper heating chamber 21 and the lower heating chamber 22 are shown as being fixed to the machine frame, or are fixed to the machine frame like the vacuum vessels 11 and 12 described above. They may be configured to be able to move toward and away from each other by means such as a hydraulic actuator.

Further upstream of the preheating zone 2, a winding roll 3 of the synthetic resin material to be coated is located, and the synthetic resin sheet 31 wound into a roll is rewound a certain amount at a time to pass through the preheating zone. 2 and continuous molding machine 1.

In the present invention, the synthetic resin sheet 31 wound into a roll is first heated in the preheating zone 2 by the heating source 23 in the preheating furnace 20 so that both its upper and lower surfaces are heated to a desired temperature, for example, 100°C. Preheated to ~200°C.

The preheated synthetic resin sheet 31 then moves to the continuous molding machine 1, which is a press zone. The vacuum containers 11 and 21 are moved toward each other by the operation of an actuator and sandwich the synthetic resin sheet 31 therebetween. As a result, the continuous molding machine 1 has a vacuum chamber divided into two by the synthetic resin sheet 31. As mentioned above, both page spaces are each equipped with a vacuum suction valve and an atmosphere release valve. Then, by the both page empty suction valve, both page empty space 11.12
is degassed. In addition, preheated synthetic resin sheet 3
1 is further heated and softened by a radiant heat source 13.13° in the vacuum container.

After the synthetic resin sheet 31 is heated to a desired temperature,
The vacuum chamber that is not on the side of the laminated body, that is, the vacuum chamber 11, is opened to the atmosphere. Then, the softened synthetic resin sheet 31 is pushed out by the atmosphere toward the object to be laminated 15, and is coated and laminated on the surface of the object to be laminated 15.

Thereafter, the two-page empty spaces 11 and 12 are separated by the operation of the actuator, and the laminated body 4 on which the synthetic resin sheets 31 are laminated is taken out from the vacuum chamber by an appropriate means and transferred to the downstream side, and is also placed in the vacuum chamber. A new stacked body 15 is set.

Thereafter, the above-mentioned operation is repeated by an appropriate control means, and a laminate is continuously formed.

Next, a second embodiment of the present invention will be described based on FIG. Note that the same members as those in the first embodiment are given the same numbers and have the same functions, so their description will not be repeated here.

In this embodiment, a preheating device 20' provided in a preheating zone 2 on the upstream side of the continuous forming machine 1 is different from that of the first embodiment. This preheating device 2
0' is a hot plate press machine that uses upper and lower flat heating plates 21' and 22' such as a casting heater or a cartridge heater as a heat source;
22' is configured so that it can be moved in the approaching and separating directions by appropriate actuators PI, PI'.

The synthetic resin sheet 31 wound into a roll is rewound a certain amount at a time, and when it reaches the preheating zone 2, it is heated to 100°C to 200°C by a heating means such as a casting heater or a cartridge heater of the preheating device 20. The upper heating plate 21'' and the lower heating plate 22' heated up to 10°C move toward each other by actuator P1. Heat.

The preheated synthetic resin sheet 31 then moves to the press zone, where it is applied to the laminated body 15 as in the first embodiment.
Laminated against.

Note that in the above embodiments, a roll-shaped synthetic resin sheet was used for continuous molding and coating, but the present invention is not limited thereto; for example, an infrastein heater, etc. It is also possible to mold synthetic resin sheets by feeding cut synthetic resin sheets one by one using a heating furnace that uses a far-infrared heater.

Further, the hot plate press shown in the second embodiment and using upper and lower heating plates using electric heaters such as casting heaters may be used together with the single-shot sheet forming machine.

〔Effect of the invention〕

As described above, the method for manufacturing a laminate according to the present invention adds a step of preheating the synthetic resin sheet to the conventional method of laminating the synthetic resin sheet on the object to be laminated, thereby producing a synthetic resin sheet in a vacuum container. It is possible to soften the material by heating and shorten the heating time when laminating it on the object to be laminated, thereby increasing the cycle of the overall process.

Furthermore, in conventional methods, thick synthetic resin sheets or foamed synthetic resin sheets require a considerable amount of time to be sufficiently heated to the non-heated side, or the heated side may overheat. However, the present invention was able to solve the above problems by preheating the unheated layer.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a first embodiment of the present invention in which a heating furnace is used in the preheating zone. FIG. 2 is a schematic side view of a second embodiment of the present invention using a hot plate press heating machine having a hot plate heated by a casting heater or the like in the preheating zone. 13... Heat source, 21, 22... Upper and lower heating chambers Applicant: Sekisui Plastics Co., Ltd. Agent, Patent Attorney: Yusuke Hiraki, Patent Attorney: Sadatsugu Ishii 1... Continuous molding machine, 2...・Preheating zone, 3...
・Synthetic resin roll, 4... Synthetic resin sheet or laminated body, 11.12... Vacuum container, Fig. 1

Claims (1)

[Claims] The synthetic resin sheet and the object to be laminated are placed facing each other in a vacuum container, and the vacuum chamber in the vacuum container is airtightly divided into two parts by the arranged synthetic resin sheet, so that the side of the vacuum chamber that is not the side of the object to be laminated is In this method, a radiant heat source is placed facing the object to be laminated via a synthetic resin sheet, and after the synthetic resin sheet is heated and softened, the vacuum system is released only in the vacuum chamber that is not on the side of the object to be laminated. A method for manufacturing a laminate, which comprises preheating the synthetic resin sheet outside a vacuum container in advance, in the method of covering the laminate with a synthetic resin sheet.