JPS6021065B2 - Continuous manufacturing method for composite sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuously producing composite sheets for use in sheet-forming materials and the like.

Conventionally, aluminum is vacuum-deposited on polystyrene sheets,
It is known to manufacture lunch boxes, plates, etc. by thermoforming using a polystyrene-polyethylene laminate sheet with a polystyrene sheet or film pressure-adhered to the coated surface.

(Special Publication No. 51-17995). However, the aluminum vapor-deposited polystyrene sheet used for this purpose is extremely uneconomical because the sheet is manufactured separately using an extruder and then directly coated with aluminum powder to form an aluminum film on the surface of the sheet. It is unproductive. The present inventors conducted research with the aim of developing a method that is highly productive and economically advantageous, and found that by extrusion bonding a plastic film coated with aluminum to a polystyrene sheet, substantially We have discovered a method for forming an aluminum vapor-deposited film on a polystyrene sheet.

One of the present inventions is an unstretched polystyrene sheet with a thickness of 100 to 1,000 mm, which is continuously extruded from an extruder and is still in a high temperature state, and a 20 mm thick unstretched polystyrene sheet with an aluminum coating film.
A continuous manufacturing method for a composite sheet, which comprises extrusion bonding a transparent non-stretched plastic thin film of ~50 peaks through an adhesive layer such that the aluminum vapor-deposited film is in contact with the surface of the polystyrene sheet. .

Another aspect of the present invention is to apply a surface treatment to impart polarity to an unstretched polystyrene sheet with a thickness of 100 to 1,000 mm, which is continuously extruded from an extruder, and then to heat the above-mentioned polystyrene sheet. , characterized in that a transparent poorly stretched plastic thin film having a thickness of 20 to 50 r having aluminum vapor deposition strength and the above sheet are extrusion bonded via an adhesive layer so that the aluminum vapor deposited film is in contact with the surface of the sheet. This is a continuous manufacturing method for composite sheets.

According to the present invention, the productivity and economy are extremely superior compared to conventional batch systems. The main feature of the present invention is that by laminating a plastic film having an aluminum vapor-deposited film and a sheet without processing the sheet itself, an unstretched plastic thin film 2 as shown in FIG. The object of the present invention is to obtain a composite sheet 1 consisting of an aluminum vapor-deposited film 3, an adhesive layer 4, and an unstretched polystyrene sheet 5.

As the plastic film used in the present invention, various types of films can be used depending on the purpose, such as olefin-based, polyester-based, and polystyrene-based films. In the present invention, it is important to immediately press and bond the polystyrene sheet continuously extruded from the extruder and still in a high temperature state to the plastic film having the aluminum vapor-deposited film through the adhesive layer.

A continuous method for laminating such sheets and films is, for example, simultaneous two-layer extrusion of polystyrene and hot-melt type adhesive resins, such as EVA-based and EEA-based resins, using a two-layer coextrusion die shown in FIG. death,
The aluminum-deposited surface of the aluminum-deposited film is pressed and thermally bonded to the adhesive resin surface, or a hot-melt adhesive resin is applied in advance to the aluminum-deposited surface of the aluminum-deposited film as shown in Fig. 3. Ok,
There is a method of press-bonding this during extrusion sheeting of polystyrene sheets, and a method of extruding and sheeting polystyrene using extrusion equipment equipped with dry-type anchor processing equipment as shown in Figure 4, and at the same time applying a solvent-based adhesive to the aluminum vapor-deposited film. Examples include drying and in-line lamination, and any method can be used to obtain a desired composite sheet. It is necessary that the adhesion between the deposited aluminum and the film be sufficiently strong.

For this purpose, a suitable anchor treatment is performed before vapor deposition, if necessary. In the present invention, as shown in FIG. 5, before the polystyrene sheet and the film having the aluminum vapor-deposited film are bonded together by pressure through the adhesive layer, the polystyrene sheet is subjected to a surface treatment in advance to impart polarity. A step of applying and then preheating the sheet is incorporated.

As such a polarizing means, for example, the sheet is surface-treated with a corona treatment machine to give a wet tension of about 40 to 4 W/2. The present invention will be further explained in detail with reference to Examples below.

Example 1 High impact polystyrene (trade name, Jinka Styrol HI manufactured by Denki Kagaku Kogyo ■) was diced at a temperature of 200 oo
The sheet was melt extruded into a sheet with a thickness of 0.38 cm, which was introduced into a chill roll, where the sheet was cooled to a temperature of 6,000 °C. The surface of the sheet is treated to a skin level, the surface of the sheet is further heated, and the sheet is sent to a thermocompression roll.

At a roll temperature of 100 qo using a thermocompression roll, the above sheet was thermocompression bonded to an aluminum vapor deposited polypropylene film whose aluminum vapor deposition surface had been treated with an adhesive consisting of ethylene vinyl acetate copolymer. A tape-shaped test piece with a medium diameter was cut out from the obtained composite sheet, and the polystyrene layer and polypropylene layer of the test piece were separated by peeling at 180°, and a peeling rate of 20°/m was applied using a tensile tester.
When the peeling force was measured at in., it showed a strength of 500 ta or more. Example 2 Polystyrene color compound die temperature 200q
A sheet having a thickness of 0.38 mm was formed by melt extrusion at 0.

This sheet is immediately pressure-bonded to an aluminum-deposited polypropylene film whose aluminum-deposited surface has been coated with a hot-melt adhesive in advance at a roll surface temperature of 100°C and a pressure of lk9/arc to obtain a practically sufficient adhesive force. A laminate was obtained having: The results of the 180mm peel test described in Example 1 showed a peel strength of 300 to 800mm, although it was slightly lower than that of the corona-treated polystyrene sheet.

[Brief explanation of the drawing]

FIG. 1 shows a composite sheet obtained by the continuous manufacturing method of the present invention, and FIGS. 2, 3, 4, and 5 show a part of the process schematic diagram of the present invention. 1: Composite sheet, 2: Unstretched plastic thin film, 3: Aluminum vapor deposited film, 4: Adhesive layer, 5: Unstretched polystyrene sheet, 6, 6': Extruder, 7: Die, 8: Chill roll/9 : Pressure heat roll, 10: Adhesive coating tank, 11: Drying oven, 12: Polarizing section, 13: Preheating section. Figure 1 *2 Figure 3 Meatfish Figure 4 Leopard Figure 5

Claims (1)

[Scope of Claims] 1. An unstretched polystyrene sheet with a thickness of 100 to 1,000 μm that is continuously extruded from an extruder and is still in a high temperature state, and a transparent non-stretched polystyrene sheet with a thickness of 20 to 50 μm that has an aluminum vapor-deposited film. 1. A method for continuously manufacturing a composite sheet, which comprises press-bonding a stretched plastic thin film through an adhesive layer so that the aluminum vapor-deposited film is in contact with the surface of the polystyrene sheet. 2 Thickness 100 to 1,0 when continuously extruded from an extruder
A 00 μm unstretched polystyrene sheet is subjected to a surface treatment for imparting polarity, and then the polystyrene sheet is preheated, and a transparent unstretched plastic thin film having a thickness of 20 to 50 μm having an aluminum vapor deposited film is attached to the sheet. A method for continuously producing a composite sheet, characterized in that the aluminum vapor-deposited film is pressed and bonded via an adhesive layer so that the aluminum vapor-deposited film is in contact with the surface of the sheet.