JPS61209137A - Manufacture of electrically conductive plastic corrugated board sheet - Google Patents

Abstract

PURPOSE:To efficiently obtain an electrically conductive plastic corrugated board sheet in line by a method wherein molten resin is extruded and simultaneously co-extruded heat bonding plastic film/electrically conductive film are delivered onto an inner core so as to laminate to the inner core formed by extruding molten resin on an endless belt. CONSTITUTION:Firstly, molten resin 12 is extruded from a T-die 11 on an endless belt 13 with a large number of recessed holes thereon and sucked from below the belt so as to form the inner core 14 of a corrugated board sheet. Secondly, molten resin 16 is extruded from a T-die 15 and simultaneously a film 17 consisting in co-extruding heat bonding plastic film/electrically conductive film is delivered onto the inner core. Thirdly, the resultant resin and film assembly is fixed by pressure with a roll 18. Finally, a plastic film is pasted onto the other side of the inner core 14 in order to obtain the titled electrically conductive plastic corrugated board sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing conductive plastic corrugated sheets.

[Conventional technology]

It has already been devised that a storage box is formed from a cardboard sheet with aluminum foil pasted on the inner wall of the container, and that the printed circuit board is protected and packed in the storage box (Utility Model No. 54-221).
(See Publication No. 50).

[Problem that the invention seeks to solve]

To create a storage box as described above, aluminum foil is pasted on one side of a corrugated cardboard sheet, and then the aluminum foil/corrugated cardboard laminate is punched into a predetermined blank shape and assembled.

That is, in order to obtain the material for the storage box as described above, two steps are required: a step of manufacturing a corrugated board sheet and a step of attaching aluminum foil to the obtained corrugated board sheet.

Therefore, the problem to be solved by the present invention is to provide a method for manufacturing a conductive corrugated board sheet that can be easily manufactured in-line for use in making a conductive case.

[Means for solving problems]

As a result of research to solve the above-mentioned problems, the present inventor has discovered the first
The molten resin is extruded from the T-die onto an endless belt with many holes in a concave shape, and is sucked from the bottom of the belt to form the center core of the corrugated pole sheet.
According to the method of extruding a molten resin from a T-die, simultaneously feeding out a coextruded film of a heat-adhesive plastic film/conductive film, and laminating the coextruded film through the melt-extruded resin layer, it can be efficiently done in-line. It was discovered that a conductive plastic corrugated board sheet can be obtained during the manufacturing process of a corrugated board sheet, and the present invention was completed based on this knowledge.

That is, the method for producing a conductive plastic corrugated sheet of the present invention involves extruding molten resin from a first T-die onto an endless belt with many concave holes, and sucking it from the bottom of the belt to form the core of the corrugated sheet. Then, the molten resin is extruded from a second T-die onto the formed core, and at the same time, a coextruded film of heat-adhesive plastic film/conductive film is fed out, and the above-mentioned It includes the step of laminating coextruded films.

In the present invention, the coextruded film may be formed by either the inflation method or the T-die method.

Next, in the present invention, as the heat-adhesive plastic or film, it is preferable to use the same material as the base material of the plastic corrugated sheet from the viewpoint of adhesive strength after heat-bonding.
Plastics having a higher density than the base material of the plastic corrugated sheet are particularly preferred since adequate heat resistance is required during the thermal bonding process.

〔Example〕

FIG. 1 shows the manufacturing process of the present invention.

A molten resin such as polyethylene (12) is extruded from the 10th T die (111) onto an endless belt 0 with many holes in a concave shape, and is sucked from the bottom of the belt to form a corrugated sheet core A4, and then a core α4 of the corrugated cardboard sheet is formed. Second T-die ae on top
At the same time as extruding a molten resin such as polyethylene, for example, a coextruded film of heat-adhesive plastic film/conductive film made by co-extruding high-density polyethylene, carbon plastic, or kneaded low-density polyethylene is fed out. A conductive sheet with a conductive film laminated on one side is pressed with a roll to form a scratch. Furthermore, by laminating a plastic film on the other surface of the core 0, a conductive plastic corrugated sheet as shown in FIG. 2(a) can be obtained. In addition, in the figure (4)
is a core, (5) is a conductive film, (6) is a thermoadhesive plastic film, (7) is a coextruded film, (8)
(9) indicates a melt-extruded resin layer, and (9) indicates a plastic film.

When laminating conductive films on both sides of a corrugated pole sheet, the conductive film is laminated on one side of the corrugated board sheet, and the conductive film is laminated on the other side in the same manner as shown in Figure 2 (2). b) A conductive plastic corrugated sheet as shown can be obtained.

〔Effect of the invention〕

As detailed above, according to the present invention, a conductive plastic corrugated board sheet can be easily obtained in-line during the manufacturing process of a plastic corrugated board sheet.

By using the conductive plastic corrugated sheet obtained by the present invention, it is possible to produce a conductive case for housing ICs and products incorporating ICs, which is inexpensive, lightweight, and has excellent content protection properties. .

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the manufacturing process of the present invention, Figure 2 (al,
(BL is a cross-sectional view showing an example of a conductive plastic corrugated sheet obtained by the manufacturing method of the present invention. (4) ...... Core

Claims (1)

[Claims] Molten resin is extruded from the first T-die onto an endless belt with many holes in a concave shape, sucked from the bottom of the belt to form a core of the corrugated cardboard sheet, and then a second T-die is placed over the formed core. A conductive plastic characterized by comprising the step of simultaneously extruding a molten resin, simultaneously drawing out a coextruded film of a thermoadhesive plastic film/conductive film, and laminating the coextruded film via the melt-extruded resin layer. Method of manufacturing corrugated sheets.