JPS6024948A - Manufacture of cushioning laminated material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a cushioning laminate material used as a backing material for manufacturing packaging boxes and the like having a cushioning function.

Small electrical equipment such as small tape recorders and radios, toys, game watches, etc. are usually packaged individually with cushioning material in paper packaging boxes with printing on the surface for sale. .

A buffer tray is used to protect the items contained in the box from impact, and these trays are generally made of foamed polystyrene paper molded products or foamed polystyrene bead molded products. . In addition, as another packaging method, the product may be wrapped with a polyethylene air cap sheet and housed in a paper packaging box.

However, boxing work using trays involves first placing items on the tray and packing the trays into boxes, which is time-consuming and inefficient, especially when the boxing work is automated and mechanized. This cannot be avoided because ξ requires one process to insert the tray and causes a big problem in terms of work efficiency.

The present invention has been made in view of the above points, and its purpose is to develop a novel material used as a material for manufacturing packaging boxes so that the packaging box itself can exhibit a buffering function. It is an object of the present invention to provide a manufacturing method for obtaining a cushioning laminate. A laminate is formed by bonding a resin sheet and a paper sheet with many suction holes pre-drilled on the other side, and the non-foaming thermoplastic resin sheet and the thermoplastic resin film in this laminate are melted. After that, the laminate is evacuated in a vacuum molding mold through suction holes provided on the paper sheet side, and the non-foaming heat is removed from the part facing the molding recess formed on the mold. This is achieved by a manufacturing method of vacuum forming so that convex portions can be formed on a plastic resin sheet, and the cushioning laminate obtained by this manufacturing method consists of a paper layer and a non-foaming thermoplastic resin. Convex portions are formed on the surface of the sheet layer in a desired shape, and packaging boxes manufactured using this laminated material can not only significantly improve the cushioning function due to the presence of the convex portions, but also improve the overall performance of the box. The required strength can be sufficiently maintained.

The non-expandable thermoplastic resin sheets used in this manufacturing method include polycarbonate, polyvinyl chloride sheets, polyethylene terephthalate, polyamides, impact-resistant polystyrene sheets, biaxially oriented polystyrene sheets, polypropylene, high-density polyethylene, and other hard materials. Any non-foaming thermoplastic resin sheet can be used. However,
If the paper sheet is printed, and considering that the printing is readable, non-foaming thermoplastic resin sheets include polyvinyl chloride, polycarbonate, polyethylene terephthalate, polyamide, polypropylene, biaxially oriented polystyrene, etc. It is preferable to use a transparent sheet.

In addition, these non-foaming thermoplastic resin sheets are subjected to surface treatment (
For example, corona discharge treatment) may be performed, or an anchor coating agent may be applied in advance.

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

As shown in Figures 1 and 2, the molding materials used in this manufacturing method are a paper sheet l and a non-foaming thermoplastic resin sheet (in this example, a hard polyvinyl chloride sheet with a wall thickness of 500 microns). used) 2 and a thermoplastic resin film 3 having a melting point of 60 to 130°C, the paper sheet 1 is, for example, art paper with a wall thickness of 500 microns and a width of 500 microns, and at least one side thereof has a required offset. It is printed. A large number of suction holes 1a with a hole diameter of 0.4 mm are provided on the paper sheet 1 at intervals of 10 m in each direction, while a non-foamable thermoplastic resin sheet 2 made of a hard polyvinyl chloride sheet is It is molded at 150 to 210°C, and the surface is coated with an anchor coating agent to improve adhesion. Moreover, as the thermoplastic resin film 3,
Low density polyethylene with a melting point of 117 to 119°C, or a melting point of 60 to 115°C (D: r-fI/7/vinyl acetate copolymer, or ethylene/vinyl acetate copolymer with acrylic acid, maleic anhydride, etc.) Various films of modified vinyl acetate copolymer resin grafted with unsaturated carboxylic acid can be used, and in the following production example, thermoplastic resin film 3
An ethylene-vinyl acetate copolymer film (gvA film) having a wall thickness of 30 microns was used.

First, a thermoplastic resin film 3 with a melting point of 82°C is heated to 200°C through a die 11 of an extruder while maintaining a wall thickness of 30 microns.
At the same time, the film 3 is extruded by a non-foaming heat having a melting point of 212°C and a softening point of 83°C. The plastic resin sheet 2 is fed out from a supply roll 13, and the three materials are formed into a laminate 4 with a thermoplastic resin film 3 as an intermediate layer by a press roll 14. Next, this laminate 4 is introduced into the heating tunnel 15, and the non-foaming thermoplastic sheet 2 side is heated with an infrared heater, -15.
After heating to melt the non-foaming thermoplastic resin sheet 2 and thermoplastic resin film 3, the laminate 4 is passed through the suction holes 1a formed in the paper sheet l into the mold 16. In order to form a convex part 2a on the non-foamable thermoplastic resin sheet 2 at the part facing the four molding parts 17 formed on the mold 16 by applying a vacuum (-700 to -10 m) on the mold 16. Vacuum forming is performed to produce the final product, the cushioning laminate material 5. Note that the mold 16 can be a normal mold consisting of a presser mold 16a and a female mold 16b, and 18 is a suction pipe, which is connected to a vacuum pump (not shown).
connected to the side.

The cushioning laminated material 5 manufactured in the above manner is trimmed and hinged into a form necessary for manufacturing a foldable packaging box, as shown in FIG. 3, for example. In the figure, reference numeral 6 denotes a hinge portion, and the hinge portion 6 may be formed at the same time by a protruding portion provided on the mold 16 during vacuum forming. In addition, if a transparent non-foaming thermoplastic resin sheet and thermoplastic resin 4° film are used, the characters etc. printed on the inner surface of the paper sheet can be easily read, unlike conventional packaging boxes. There is no need to insert a separate instruction manual.

The present invention is as described above, and since the produced laminate has convex portions formed on the non-foaming thermoplastic resin sheet layer,
Together with the sheet layer, the packaging box manufactured from this laminated material has excellent cushioning properties, has high mechanical strength, and can sufficiently protect the stored items. According to the method, in the vacuum forming step, the portions of the thermoplastic resin film that becomes the intermediate layer (indicated by reference numeral a in FIG. 2) corresponding to the convex portions of the non-foaming thermoplastic resin sheet are compressed by the depressurizing action of vacuuming. Since it is peeled off from the paper sheet layer, the convex part is molded to fit easily into the molding surface (concave part) of the mold, which not only improves the cushioning performance but also looks good. Therefore, a cushioning laminate material with excellent commercial value can be manufactured.

[Brief explanation of the drawing]

FIG. 1 illustrates the manufacturing method of the present invention. FIG. 2 is a front sectional view of a laminated material manufactured by the manufacturing method of the present invention, and FIG. 3 is a developed view showing an example of trimming the same laminated chestnut. In the figure, ■ is a paper sheet, 1a is a suction hole, 2 is a non-foaming thermoplastic resin sheet, 2a is a convex part, 3 is a thermoplastic resin film, 4 is a laminate, 16 is a mold, 17 is a molding This is a recess for use. Patent Applicant: Yuka Bade Tsun-ae Shashiki Co., Ltd.

Claims (1)

[Claims] A non-foaming thermoplastic resin sheet having a softening point higher than the melting point of the resin of the film is bonded to one side of the thermoplastic resin film, and a paper sheet in which numerous suction holes are pre-drilled is bonded to the other side. After melting the non-foamable thermoplastic resin sheet and the thermoplastic resin film in this laminate, the laminate is passed through a suction hole provided on the paper sheet side to form a vacuum forming mold. A cushioning property characterized by vacuum forming in a mold so that a convex part can be formed on a non-foaming thermoplastic resin sheet in the part facing the four molding parts formed on the mold. Method of manufacturing laminated materials.