JPS60225739A - Manufacture of buffer laminate material - Google Patents

Abstract

PURPOSE:To obtain a buffer laminate material using paper without holes by forming a convex on a thermoplastic synthetic resin sheet at a part corresponding to a molding concave provided on a mold. CONSTITUTION:A laminate body 4 is transferred to a heating tunnel 15 being held at bulged sections leaving a gap (a) therebetween. The laminate body 4 proceeding into the heating tunnel 15 is heated with an infrared heater 15a to melt a foam polystylene sheet 2 and an ethylenevinyl acetate copolymer film 3 while a breathing gap (b) is formed between the melted layer and a paper sheet 1. Then, the laminate body 4 undergoes a vacuum forming with a vacuum forming mold 17. The vacuum forming is performed by evacuation through clearances (a) and (b) formed in the laminate body 4. With the vacuum forming, a convex 2a is formed on the foam polystylene sheet 2 at a part corresponding to molding concave 18 provided on the mold 17 to manufacture a buffer laminate material 5 which is the end product.

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a cushioning laminate.

BACKGROUND OF THE INVENTION It is conventionally known to produce cushioning materials in which paper and resin sheet vacuum-formed products are bonded together. For example,
Publication No. 8-47335 discloses a method in which an air-impermeable sheet made of thermoplastic resin and a paper having holes on the surface of which a synthetic resin film is laminated are placed one on top of the other with the air-impermeable sheet positioned on the mold side. A method is disclosed in which a container with a lid or a cushioning material is manufactured by heating the non-porous sheet to a temperature higher than the heat deformation temperature of the non-porous sheet, and then vacuum forming only the non-porous sheet along a mold. However, when manufacturing boxes using this vacuum-formed laminated cushioning material, the rough side or outer surface layer is printed, etc., and the holes present in this paper give a strange feeling to consumers, which is not desirable in this invention. In view of the above points, the object of the present invention is to provide a manufacturing method for obtaining a cushioning laminate using paper without pores, the purpose of which is to provide a manufacturing method for obtaining a cushioning laminate using paper without holes, the purpose of which is to provide a method for producing a cushioning laminate using paper having no pores, the purpose of which is to provide a method for producing a cushioning laminate using a paper having no pores. A fat sheet is bonded to the thermoplastic composite 11 having a softening point higher than that of the resin, and a rigid sheet such as paper or metal sheet is bonded to the other side. After forming a protruding laminate and holding this laminate at the protruding parts so that a gap remains between the protruding parts, the laminate is heated to separate the thermoplastic synthetic resin film and the thermoplastic synthetic resin. At the same time as melting the sheet,
A ventilation gap is created between the molten layer and the rigid sheet, and then the laminate is evacuated on a vacuum forming mold through the above-mentioned air gap, and placed on the mold. This can be achieved by a manufacturing method in which vacuum forming is performed so that convex parts can be formed on the thermoplastic synthetic resin sheet in the portion facing the four molding parts, and the cushioning laminate obtained by this manufacturing method is A rigid sheet layer such as a metal sheet and one layer of thermoplastic synthetic resin sheet are integrally adhered, and the surface of the synthetic resin sheet layer has convex portions formed in a desired shape in an attractive manner. Not only can the cushioning function of the manufactured packaging box be significantly improved by the presence of the inner part, but the box as a whole can sufficiently maintain the required strength.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In Figures 1 and 4, the molding materials are paper or an iron sheet with a wall thickness of 8 to 50 mm, a rigid sheet 1-1 such as aluminum sheet 1, a thermoplastic synthetic resin sheet 1-2, and a thermoplastic sheet 1-2. In this embodiment, the plastic synthetic resin film 3 has a rigid sheath 1 having a thickness of, for example, 500 μm and a width of 500 μm.
mm art paper, with offset printing applied to at least one side. On the other hand, the thermoplastic synthetic resin sheet 2 has a width of 2.0 mm and a width of 500 m.
m, and a winding density of 0.02 to 0.2 k' is used, and this sheet is heated to 140 to 180'C.
molded in. Further, as the thermoplastic synthetic resin film 3, low density polyethylene having a melting point of 117 to 119'C;
Or a modified dinylacetate copolymer resin with a melting point of 60 to 115°C, which is obtained by grafting unsaturated carposi acid such as acrylic acid or maleic anhydride to ethylene diacetate copolymer 1 or ethylene diacetate copolymer with unsaturated carposi acid such as acrylic acid or maleic anhydride. It is preferable to use each film 1, and in this example, a thermoplastic synthetic resin film 3.
The wall thickness is 30 mm, the width is 460 to 480 mm.
``Vinegar-Hinyl Copolymer (VA for E)'' film.

First, an ethylene/dynyl acetate copolymer film 3 having a glass point of 82'c is extruded from an extruder 11 at 200''c while maintaining the wall thickness at 30mm[1], and this film 3 is passed through a supply roll. At the same time, a foamed polystyrene sheet 2 with a black density of 0.035 k,' is fed out from the supply roll 13, and the paper sheet (rigid sheet) l fed out from the supply roll 12 is advanced along the opposite surface of the printing side. The three materials are pressed 0-0 to ethylene/acetic acid, which will be the intermediate layer, so that the paper sheet 1 and foamed polyester resin sheet 2, which will be the outer layer, protrude from the left and right sides of the nil copolymer film 3 by about 20 to 40 mm.
514 to join and form a laminated layer 4 as shown in FIG. Next, this laminate 4 is transferred toward the heating tunnel 15 while being held at the protruding portions so that a gap a remains between the protruding portions. A normal classical chain (not shown) is used for this transfer. The laminate 4 that has entered the heating tunnel 15 is heated by the infrared rays 15a overnight, melting the foamed polyester resin sheet 2 and the Oude resin/dinyl acetate copolymer film 3, and simultaneously melting the molten layer and the paper sheet. A ventilation gap is formed between the This ventilation gap is formed as shown in FIG. 3 and is caused by the difference in the thermal expansion coefficients of the molten layer and the paper sheet 1. In the figure, 16 indicates the classic chain of the classic chain.

Next, the laminate 4 is vacuum formed using a vacuum forming mold 17. This vacuum forming 1: is carried out by drawing a vacuum through the gaps a and b formed in the laminate 4, and is applied to the foamed polystyrene sheet 12 in the portion facing the molding recess 18 provided on the mold 17. By vacuum forming to form the convex portions 2a, a cushioning laminate 5, which is a final product, is manufactured as shown in FIG. Note that the mold 17 can be a normal vacuum molding mold consisting of a presser mold 17a and a female mold 17b, and 19 is its suction pipe, which is connected to the vacuum body (not shown). There is. Note that the thermoplastic synthetic resin sheet is made of non-foaming polysilicone.
A sheet of thermoplastic resin with a high melting point such as paper, polyvinyl chloride, polycarbonate, etc. may be used.Furthermore, in order to hold FIlib between the ventilation between the paper sheet 1 and the melted layer, the female mold 17b After contacting the laminate 4, the presser maple mold 17a is brought into contact with the laminate 4 (mold clamping) with a delay of about 0.2 seconds.

The cushioning laminate material 5 manufactured as described above is trimmed and wrinkled as necessary. However,
If transparent thermoplastic synthetic resin sheets and thermoplastic synthetic resin films, such as polyvinyl chloride, are used for the sheet, characters printed on the inner surface of the paper sheet can be easily read, making it easier to read the characters printed on the inner surface of the paper sheet, making it easier to read the characters printed on the inner surface of the paper sheet. Therefore, there is no need to separately insert a manual for the stored object.

The present invention is as described above, in which the produced laminate has a thermoplastic synthetic resin sheet layer with convex portions, and the packaging box made of the laminate has high mechanical strength and can be accommodated. Items can be adequately protected. According to this manufacturing method, the ventilation gap required for vacuum forming is formed between the rigid sheet layer and the thermoplastic synthetic resin layer when the laminate is heated, so for example, it is necessary for vacuuming on the paper sheet side. Vacuum forming can be carried out without having to provide ventilation holes in advance, and in the vacuum forming step, the thermoplastic synthetic #l resin film that becomes the intermediate layer is formed in the portions corresponding to the convex portions of the thermoplastic synthetic resin sheet (the first (indicated by symbol C in Figure 4) is peeled off by the depressurizing action of vacuuming, so the convex part is formed in a state that fits comfortably into the molding recess of the mold, and the cushioning performance is improved. Needless to say, the paper sheet can maintain its flat state, has a good appearance, and has the effect of producing a cushioning laminate material with excellent commercial value.

[Brief explanation of the drawing]

Fig. 1 is a process diagram for explaining the manufacturing method of the present invention, Fig. 2 is a front sectional view of the laminate before heating, Fig. 3 is a side sectional view of the laminate after heating, and Fig. 4 is the main It is a front sectional view of the laminated material manufactured by the invention manufacturing method. In the figure, 1 is a rigid sheet, 2 is a thermoplastic synthetic resin layer sheet, 2a is a convex portion, 3 is a thermoplastic synthetic resin film, 4 is a laminate, 15a is an infrared ray heater, 17 is a mold for vacuum forming,
18 is the four molding parts, a is the gap, and b is the ventilation gap. Patent applicant Yuka Bachiichi ■ Agent Co., Ltd.
Patent Attorney Sada Kikukawa: 4: ■Yu゛±! ! F+n(
I-2;', :J! -1°Mi Figure 1 Figure 2

Claims (1)

[Claims] A laminate is formed on one side of a thermoplastic synthetic resin film in which both sheets 1 having a softening point higher than that of the resin from which the film is made protrudes from both left and right sides of the film, and this laminate is After holding the protruding parts so that a gap remains between the protruding parts, the laminate is heated to melt the thermoplastic synthetic resin film and the thermoplastic synthetic resin sheet, and at the same time, the melted layer and the rigidity A ventilation gap is created between the sheets, and then the laminate is evacuated through the ventilation gap on a vacuum forming mold,
A method for manufacturing a cushioning laminate, which comprises performing vacuum forming so that a convex portion can be formed on a portion of the thermoplastic synthetic resin sheet facing a molding recess provided on the mold.