JPS6194757A - Manufacture of laminated sheet - 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 (Industrial Application Field) The present invention relates to a method for manufacturing a polyolefin laminated sheet whose surface is integrally laminated with aluminum foil that can be used as various building materials or mirror materials.

(Prior Art) Polyolefin sheets having aluminum foil on one or both sides are already known as laminated sheets used for various building materials and the like. This sheet is widely used because it has the following advantages: it is lightweight and rigid, easy to cut and form, does not rust, and can be used as a flame-retardant material if aluminum foil is provided on both sides. It looks like this.

Conventionally, methods for producing such laminated sheets include, for example, Japanese Patent Publication No. 50-23705 and Japanese Patent Publication No. 56-101.
As shown in Japanese Patent No. 84, a method has been adopted in which polyolefin is melt-extruded and then pressure-bonded to aluminum foil, and studies are being conducted to modify polyolefin in order to improve adhesiveness.

However, when using this method, it is necessary to modify the polyolefin, which originally has poor adhesive properties, and the manufacturing equipment is large-scale, making it difficult to manufacture easily.

(Problems to be Solved by the Invention) In view of the above circumstances, the present invention proposes that once a polyolefin film and an aluminum foil are bonded together, a laminated sheet of this product can be manufactured more efficiently and simply. He discovered a scale that can be manufactured and completed the present invention.

(Means for Solving the Problems) The present invention has been made to achieve the above object, and its gist is to bond an aluminum foil and a polyolefin film in advance to form a laminated film,
The first invention is a method for manufacturing a laminated sheet, which is characterized by stacking a polyolefin sheet on the polyolefin film side of the laminated film and heat-pressing it to integrate it. .

A second invention provides a method for producing a laminated sheet, characterized in that the laminated film is fed to a polishing roll in extrusion molding of a polyolefin sheet so that the polyolefins are in contact with each other, and the laminated film is laminated and integrated while being taken off. .

Hereinafter, the present invention will be explained according to the steps shown in the drawings.

Figure 1 shows the process of the first invention of the present invention. First, an aluminum foil (1) such as Al and a polyolefin film (2) are prepared, and the two are bonded together as shown in Figure (B). , a laminated film (3).The aluminum foil (1) used at this time has a thickness of about 5 to 300μ, but one with a high surface gloss is preferable.The polyolefin film (2) is made of polyethylene. Film, polypropylene film, etc. with a thickness of 10 to 200μ
A certain degree is used. The adhesion at this time is preferably performed by sandwiching the rolled aluminum foil (1) and the rolled polyolefin film (2) between a pair of rollers, and the adhesive to be interposed between them is as follows:
Incyanate, melamine or epoxy adhesives are used.

The laminated sheet (3) obtained as described above can be easily obtained using an existing laminating device, and because of its structure, it can be rolled up and stored, making it extremely easy to handle.

Next, cut the above laminated sheet (31) into a predetermined size,
This and a separately prepared polyolefin film (4) are stacked and hot pressed to form a laminated body.

At this time, in the laminated sheet (3), the polyolefin film (2)' side is the polyolefin sheet (4).
so that it is in contact with In addition, polyolefin sheet (4
), polyethylene, polypropylene, or the like having a thickness of about 0.5 to 5 mm is used. The hot pressing conditions for the laminated sheet (3) and the polyolefin sheet (4) are set to the softening temperature of the polyolefin sheet used, and the temperature is approximately 110 to 130°C.

Although the laminated sheet of the present invention can be obtained as described above, it can be produced simply and efficiently using existing equipment. When hot pressing in this way, the surface smoothness of the laminated sheet must be carefully maintained. However, in order to perform the process more efficiently, it is preferable to stack the presses in several stages and use a so-called multi-stage press method.

FIG. 2 shows the steps of the second invention of the present invention. The example shown in FIG. 1 and the example shown in FIG. 2 are different in the process shown in FIG. That is, as shown in FIG.
). Next, the laminated film (3) and the polyolefin sheet (4) are laminated. In this example, when extruding the polyolefin sheet (4), the polishing roll (5) 3) Supply. As a result, a laminated sheet in which the aluminum foil (1) is laminated can be easily obtained when producing the polyolefin sheet (4).

Note that it is also effective to perform heat pressing to polish the surface after laminating and integrating with a polishing roll.

In the examples shown in Figures 1 and 2 above, the laminated film (3) is laminated on one side of the polyolefin sheet (4), but the laminated film (3) is laminated on both sides as shown in Figure 3. It may be laminated.

(Examples) Example 1 A 100 μm thick aluminum foil and a 50 μm thick low density polyethylene film were laminated using an incyanate adhesive and aged at about 40° C. for 2 days to complete adhesion.

Next, a high-density polyethylene sheet with a thickness of 3++IIE was prepared, and this was brought into contact with the polyethylene film surface of the laminated film obtained above, and both were sandwiched between mirror plates. First, the pressure was applied to 5kg/crIL2 to bleed the air, and then the temperature and pressure were gradually increased to a final pressure of 80kg/cIr.
L! Pressing was carried out at a temperature of 127°C.

The thus obtained laminated sheet was of good quality, with strong adhesion and excellent surface smoothness.

Example 2 The same laminated film used in Example 1 was used and fed to the polishing roll of an extruder.

High-density polyethylene was extruded from the extruder so that the polyethylene film surfaces of the laminated film were in contact with each other.

The roll temperature of this polishing roll was set at about 175° C., and the obtained laminated sheet was of good quality and was strongly laminated.

Furthermore, when the laminated sheet obtained above was subjected to the same hot pressing as in Example 1, a product with even better surface smoothness was obtained.

(Effects of the Invention) Since the present invention has the configuration as described in detail above, it has the advantage that a laminated sheet having aluminum foil on at least one side can be easily manufactured using existing equipment.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing an embodiment of the first invention of the present invention;
FIG. 2 is a process diagram showing one embodiment of the second invention, and FIG. 3 is a side view of a laminated sheet obtained by another embodiment. (1)...Aluminum foil (2)...Polyolefin sheet (3)...
・Laminated film

Claims (1)

[Scope of Claims] 1. A laminate sheet characterized in that an aluminum foil and a polyolefin film are bonded in advance to form a laminate film, and a polyolefin sheet is stacked on the polyolefin film side of the laminate film and heat-pressed and integrated. Production method. 2. Aluminum foil and polyolefin film are bonded in advance to form a laminated film, and this laminated film is fed to a polishing roll in extrusion molding of a polyolefin sheet so that the polyolefins are in contact with each other, and the laminated film is integrated while being taken off. A method for manufacturing a laminated sheet. 3. The method for producing a laminated sheet according to claim 2, which comprises heating and pressing after laminating and integrating the sheets.