JPS59215823A - Manufacture of adhesive polyolefin sheet - Google Patents

Abstract

PURPOSE:To manufacture an adhesive polyolefin sheet by a method wherein a resin which does not adhere to the adhesive polyolefin and does not stick to a cooling roll is extruded as the outermost layer of a multi-layer sheet together with other layers and the outermost layer only is peeled off. CONSTITUTION:A core layer 1, an adhesive polyolefin layer 2 and a resin layer 3 which does not adhere to the adhesive polyolefin layer 2 are melted, kneaded and extruded by extruders 4, 4' and 4'' and made solid by a die 5 to form a multi-layer simultaneously extruded sheet 7 and the sheet 7 is cooled and solidized by a cooling roll 6. After the sheet 7 passes a drawing roll 8, the said resin layer 3 is peeled off from the adhesive polyolefin layer 2 to obtain a required polyolefin sheet 9. The core layer 1 and the adhesive polyolefin adhesive layer 2 may be composed of the same composition, i.e. the core layer 1 may be the adhesive polyolefin layer itself. Said sheet is applied to a metal-polyolefin-metal structural body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polyolefin sheet suitable for use in a gold layer-polyolefin sheet-metal sandwich structure.

The fully flexural polyolefin sheet/metal sandwich structure can be manufactured by applying surface treatment such as corona discharge to both sides of the polyolefin sheet and then bonding it to metal such as aluminum using an epoxy resin diluent. A method is used in which adhesive polyolefin films having excellent adhesion to metals are interposed on both sides of a polyolefin sheet and the film is heat-sealed by pressing with a press or the like.

In the method of hot pressing a polyolefin sheet with adhesive polyolefin films interposed on both sides, the work efficiency will be reduced unless the polyolefin sheet and adhesive polyolefin film are integrated in advance. Co-extrusion of the polyolefin sheet and adhesive polyolefin film may be considered as a way to integrate the polyolefin sheet and the adhesive polyolefin film, but it may be difficult to control the temperature of the take-up roll sufficiently or to increase the production Δ. High-speed extrusion has the disadvantage that the surface area of the cooling roll increases and the adhesive polyolefin film adheres to the roll.

The present invention was developed as a result of research aimed at improving these drawbacks, and as a result, during extrusion molding of an adhesive polyolefin alone or a multilayer sheet having an adhesive polyolefin as the outer layer, the outermost layer of the adhesive polyolefin is
After coextruding the sheet and a resin layer that is not attached to the bone, the sheet is passed through a cooling roll and then the resin layer is peeled off.

That is, 1) the present invention involves co-extruding a multilayer sheet having the outermost resin layer that does not adhere to the adhesive polyolefin and does not adhere to the cooling roll, cools it, and then peeling off the outermost resin layer.

The objective is to obtain a sheet consisting of an adhesive polyolefin alone or an adhesive polyolefin sheet having a three-layer structure in which the adhesive polyolefin is used as an outer layer.

Embodiments of the present invention will be described using the drawings.

FIG. 1 is a cross-sectional view of a five-pack sheet 7 consisting of a core material 1g 1 , an adhesive polyolefin layer 2, and a resin layer 3 not in contact with the adhesive polyolefin layer 2 after being coextruded and passing through a cooling roll. .

FIG. 2 is an explanatory diagram of the implementation status of the present invention.

Extrusion J'14, 4', 4' melt-kneaded and extruded core 1i; 3'E! x, iJ contact polyolefin layer 2
and a resin layer 3 that does not adhere to the adhesive polyolefin layer 2.

It is integrated in a die 5, formed into a coextruded five-layer sheet 7, and cooled and solidified in a cooling roll 6. After passing through the take-up roll 8, the resin layer 3 is peeled off from the adhesive polyolefin layer 2 to obtain the desired adhesive polyolefin sheet 9 having the adhesive polyolefin layer 2 as the outermost layer.

FIG. 3 is a sectional view of the adhesive polyolefin sheet 9 after the adhesive polyolefin waste 2 and the non-adhesive resin layer 3 have been peeled off.

Incidentally, in FIGS. 1 and 3, the core material layer 1 and the adhesive polyolefin layer 2 may be made of the same composition, that is, the core material layer may be the adhesive polyolefin material itself.

Examples The compositions shown in Table 1 were coextruded by the method explained in FIG. 2, and the surface temperature of the cooling roll and the adhesion of the resin to the roll were observed.

As is clear from Table 1, if a resin layer is not stacked on the surface and coextruded, the resin will adhere to the cooling roll at 80°C, whereas in the present invention, the surface temperature of the cooling roll is 12,000°C. However, if the resin layer is not made of a material different from that of the adhesive polyolefin, it will not be possible to release it after cooling, and the desired adhesive polyolefin sheet will not be obtained.

As mentioned above, according to the present invention, even if the temperature of the cooling roll increases by 1" during extrusion molding at high speed, the grease-resistant resin will not adhere to the cooling roll, so that the polyolefin can be efficiently contacted with the cooling roll. It is possible to produce sheets, and its industrial value is enormous.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a coextruded five-layer sheet before resin layer peeling produced according to the present invention, Fig. 2 is an explanatory diagram showing the implementation status of the present invention △, and Fig. 3 is an adhesive produced from the present invention 1. 1 is a cross-sectional view of a polyolefin sheet. 1 is a core material layer, and 2 is an adhesive polyolefin layer. 3 is a resin layer, 4.4', 4' is an extruder. 5 is gooey, 6 is cooling roll. 9 is Osteoplasty Polyolefin Sea I/Patent Applicant

Claims (1)

[Claims] During extrusion molding of an adhesive polyolefin alone or a multilayer sheet having adhesive polyolefin as an outer layer, a resin layer that does not adhere to the bone-bonding polyolefin is coextruded and layered on the surface of the sheet, and after cooling, the resin layer is peeled off and removed. A method for producing a polyolefin sheet characterized by: