JPS62144926A - Manufacture of covering material - Google Patents

Abstract

PURPOSE:To enhance workability and mass productivity by heating up a continuous band-type material forming the adhesive layer on one side of thermoplastic resin sheet, vacuum forming the same while said adhesive layer is being melted and softened and contact bonding the thermoplastic resin sheet molded product for molding an independent air chamber. CONSTITUTION:A continuous belt-type material 1 comprises a adhesive layer 3 formed up by coating and drying a fluid adhesive or by melting and laminating low-melting thermoplastic film on one side of the thermoplastic resin sheet 2. After taking out the continuous belt-type material 1 in such a way that the side of thermoplastic resin sheet 2 is positioned on the top and passing the same through the heating oven 5 to melt and soften the adhesive layer 3 and the thermoplastic resin sheet 2, the continuous belt-type material is sent to the lower face of vacuum forming mold 6 and vacuum formed into the specified shape by operating the mold 6. Then, while an adhesive layer 3 is still in the condition of being melted and softened, the thermoplastic resin sheet molded product 12 for forming the independent air chamber with a number of concaves is integrally adhered to manufacture the covering material having an independent air chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing a lid material having a large number of independent air chambers, having heat insulation properties, and having appropriate rigidity.

(Prior Art) Conventionally, a polyvinyl chloride vacuum-formed product lid, which allows the contents to be seen through, has been used as a lid material for a fish top of a foamed polystyrene molded product. However, these lids have the disadvantage of poor thermal insulation properties.

Therefore, in order to improve the drawbacks of the lid material, it was proposed that two transparent resin sheets be vacuum-formed and integrated with adhesive to create a device with an independent air chamber.
It was proposed as a device related to 2331M.

When manufacturing such a lid material, a thermoplastic resin molded product is vacuum formed into a sheet for forming an independent air chamber having a large number of four parts, and a flat thermoplastic resin sheet is bonded to this molded product for forming an independent air chamber. At this time, an adhesive is applied to the flat part of the molded product for forming the independent air chamber, and the molded product is integrated with the molded product using the adhesive.

If a lid material is made of a composite material having many independent air chambers made by gluing thermoplastic resin sheets together, and then cut into a predetermined shape to form a lid having many independent air chambers, it will have excellent heat insulation properties and a moderate amount of heat. It has rigidity and is effective as a container lid for keeping the contents warm or cold, and is lightweight and easy to handle, and is particularly effective in combination with a container body made of expanded polystyrene.

(Problems to be Solved by the Invention) As in the conventional method, an adhesive is applied to the flat part of a molded product for forming an independent air chamber having a large number of recesses, and flat thermoplastic resin sheets are stacked and bonded. There were problems in that the work required to do this was time-consuming, lacked workability, and was poor in mass production.

(Means for Solving the Problems) The present invention provides a means by which a lid material having a large number of independent air chambers can be manufactured extremely efficiently and continuously. A continuous strip formed by forming an adhesive layer on one side of the sheet is heated to melt the adhesive layer and the thermoplastic resin sheet, and while the continuous strip is in a softened state, it is inserted into a vacuum forming mold. The continuous strip is vacuum formed with the thermoplastic resin sheet side facing toward the surface, and then, while the adhesive layer of the continuous strip is in a softened state, a large number of four-part independent This is a method for manufacturing a lid material, characterized in that a molded product of a thermal OJ plastic resin sheet for forming an air chamber is adhered.

(Example) Embodiments of the method of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a continuous strip used in the method of the present invention as a raised part, and the continuous strip 1 has a thermoplastic resin sheet 2 coated with polyvinyl acetate, ethylene/vinyl acetate copolymer emulsion, etc. on one side. The contact layer 3 is formed by applying and drying a liquid adhesive, or by melt-laminating a low melting point thermoplastic resin film.

In this case, the resin for the thermoplastic resin sheet 2 includes high melting point thermoplastic resins such as polyethylene terephthalate, polyamide, polyvinyl chloride, polystyrene, polypropylene, and polycarbonate.
The thickness of the adhesive is 100 microns to 2ffiI11, and the adhesive is 1i! As the low melting point thermoplastic resin for 3, for example, low density polyethylene, ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, Surlyn (registered trademark) is used, and this adhesive layer 3 has a thickness of 10 microns. ~100
It is a thin layer of microns.

Next, referring to FIG. 1, when the continuous strip 1 is wound around the winding shaft 4 and pulled out, the thermoplastic resin sheet 2 side is positioned on the upper side. After the adhesive layer 3 and the thermoplastic resin sheet 2 are melted and softened, they are sent to the lower surface of the vacuum molding die 6, and the vacuum forming die 6 is operated to vacuum form them into a predetermined shape. do.

In this case, the vacuum forming mold 6 has vacuum suction holes 8, 8, . Part 10, 10 and
There is a flat lower surface portion 11 for forming a flat recess on the top surface of the lid.

Next, while the adhesive 113 is in a molten and softened state, the molded thermoplastic resin sheet 12 for forming an independent air chamber having a large number of recesses is brought into pressure contact with the molten and softened adhesive layer 3 to be bonded and integrated. A lid material having a chamber is manufactured.

The thermoplastic resin sheet molded product 12 for forming an independent air chamber has, for example, nine rectangular recesses 1211 formed inside the edge portion 12a, as shown in FIG.
A flat part 12G between b.

12C is formed.

In this way, the pre-formed thermoplastic resin sheet molded product 12 for forming an independent air chamber is removably fitted into the parts 11!114 attached to the elevating member 13, as shown in FIG.

The fitting 14 is attached to the edge portion 12 as shown in FIG.
A four-peripheral convex portion 14a that abuts on the upper surface, and a rectangular concave portion 1
Inserting 2b, 12b... 8+! 6 Recessed portion 14b, 1
4b... and the partition part 14C21/IC... which makes the flat part 12C112G come into contact with the upper surface, and makes the edge part 12a come into contact with the upper surface of the four circumferential convex part 14a, and makes the four part 14
b.

The rectangular recesses 12b, 12b are fitted into the partition walls 14C, 14C..., and the flat parts 12C012c are placed on the upper surfaces of the partition walls 14C, 14C...
are brought into contact with each other to fit the molded thermoplastic resin sheet 12 for forming an independent air chamber onto the drawing board 14.

It is molded by the mold surface 9 of the vacuum molding mold 6.

The elevating member 13 is raised toward the exposed adhesive layer 3 of the continuous strip 1, and the four-circumferential convex portion 14 is placed in the concave portion 10°10.
a, and press the edge part 12a to the adhesive layer 3 on the bottom of the recessed part 10.10, and also press the flat part 12C, 12C.
... is pressed onto the adhesive layer 3 formed by the flat lower surface portion 11, and the thermoplastic resin sheet molded product 12 for forming an independent air chamber is bonded and integrated with the continuous strip 1 by the adhesive layer 3 in a melted and softened state. Many independent air ff15.15...
(see Figure 4).

In this way, the continuous strip 1 is heated to melt and soften the adhesive layer 3 and then vacuum formed, and while the continuous strip 1 is in close contact with the mold surface 9, the resin sheet molded product 12 for forming an independent air chamber is adhered. The continuous band 1 and the resin sheet molded product 12 for forming independent air chambers are combined to form a band-shaped lid material 16 having a large number of independent air chambers 15 and 15, and this band-shaped lid Material 16 is subjected to the next punching process (not shown)
The material is fed to a container and cut according to a punching method (the lid 17 shown in FIG. 4 is formed).

The lid 17 has excellent heat insulation properties due to the large number of independent air chambers 15.15, and has appropriate rigidity.

In addition, in the case where the inside of the container body (not shown) is made into a swallow that can be seen through, a continuous strip made of a thermoplastic transparent resin sheet with a transparent adhesive layer formed on one side is heated to melt the transparent adhesive layer. The thermoplastic transparent resin sheet is molded in a softened state with the thermoplastic transparent resin sheet facing the mold surface of a vacuum mold, and then, while the transparent adhesive layer is in a softened state, a large number of A thermoplastic transparent resin sheet molded product for forming an independent air chamber having a concave portion is adhered to form a lid material.

By handling and cutting such a transparent lid material to form a lid, it is possible to see through the quality and preservation state of the contents inside the container body without removing the lid.

(Effects of the Invention) The present invention heats a continuous band-shaped body formed by forming an adhesive layer on one side of a thermoplastic resin sheet, vacuum-forms the adhesive layer while it is in a melted and softened state, and forms a large number of recesses. Since the thermoplastic resin sheet molded product for forming independent air chambers is crimped, continuous labor can be performed, and mass production is excellent.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram for explaining the present invention in detail, Fig. 2 is a partial sectional view of a continuous strip according to the present invention, and Fig. 3 is a molded resin sheet for forming an independent air chamber having a large number of four parts. FIG. 4 is a partially cutaway perspective view of a lid obtained by punching and cutting the band-shaped lid material according to the present invention. 1... Continuous band-shaped body, 2... Thermoplastic resin sheet, 3
...Adhesive layer, 5. Heating furnace, 6. Vacuum forming mold, 12. Thermoplastic resin sheet molded product for forming independent air chambers, 13. Lifting member, 14.・Drawing board, 15・
... Air chamber, 16... Band-shaped lid material, 17... Lid.

Claims (1)

[Claims] A continuous strip formed by forming an adhesive layer on one side of a thermoplastic resin sheet is heated to melt the adhesive layer and the thermoplastic resin sheet, and while the continuous strip is in a softened state, a mold for vacuum forming is formed. Vacuum forming is performed with the thermoplastic resin sheet side of the continuous strip facing the mold surface of the mold, and then, while the adhesive layer of the continuous strip is in a softened state, a large number of recesses are formed from below the vacuum forming mold. 1. A method for producing a lid material, characterized in that a molded thermoplastic resin sheet for forming an independent air chamber having the following properties is adhered.