JPS58162346A - Manufacture of film for uneven pattern packing - 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 The present invention relates to a laminated film in which a plastic film is extra-coated with a polyolefin, and more particularly to a method for producing a laminated film in which an embossed pattern is formed on the base material side of the laminated film.

BACKGROUND ART Generally, a laminated film having a sealing material layer laminated on the inner surface to provide thermal adhesive properties is used as a packaging film for foods and the like. Embossing can be applied to such a laminated film by mechanically embossing the film surface after lamination, or by heating and softening the film and applying a pattern on the film surface using an engraved roll. According to this method, it is easy to perform rainbow boss processing on the surface of the sealing material layer, which has a low softening temperature, but it is difficult to uniformly embossing the surface of the base material. Also, since lamination and embossing are two processes, profitability is also poor.

The object of the present invention is to uniformly emboss the surface of the base material of the laminated film and make the surface of the sealing material layer smooth so that it does not interfere with thermal adhesion. It was devised so that it could be made in one step at the same time.

An uneven engraved pattern is provided on the surface of a press roll that is in close contact with the cooling roll of a device for extrusion coating polyolefin on ordinary plastic film, or a sheet with an uneven pattern is wiped on the press roll with a belt.

The press roll is usually made of a soft material such as rubber, and its surface is treated to emboss various designs, or it is pasted onto a 'sea refle' or scroll with an embossed design. In addition, a roll corresponding to the press roll is installed, and a sheet with an embossed design is placed between the two rolls in the form of a belt. In such a press, the surface of the cooling roll that comes into close contact with the roll is usually smooth and has a matte finish or the like.

During extrusion coating of polyolefin and polyolefin in this method, a substrate heated with molten polyolefin film is brought into contact with a press roll having 9 embossed patterns, and the molten polyolefin film becomes smooth. It comes into contact with the ring roll, and an embossed laminated film is produced in which a pattern is embossed on the base material surface and the polyolefin surface, which is the sealing material layer, is smooth. Plastic films such as polypropylene, nylon, polyester, and vinylon can be used as the base material.

As the sealant for coating, polyethylene, ethylene vinyl acetate copolymer, ionomer, polypropylene, etc. can be used. Type of base material, thickness, type of coating polymer, 2, 5, thickness ζ -
It is necessary to appropriately select the timing speed, etc. Particularly important is the selection of the thickness XO of the base material and coating polymer.

As a result of repeated research, it has been found that 1, which provides a pattern effectively and stably, is particularly preferably when the thickness of the base film is 40μ or less and the thickness of the coating polymer is 1θμ or more.

Example 1.

In Fig. 1, molten low-density polyethylene is extruded from the extruder (1) of the extrusion coating device, is extruded from the upper lip of the nylon film fed from the delivery side, and is then extruded from the upper lip of the nylon film (see Fig. 1).
1), and the laminated film is sent to the winding side and wound up. For example, this laminated film is made of nylon 16μ
, the coating polyethylene layer is of 80μ construction.

During this lamination, the nylon film is softened by the heat of the molten low-density polyethylene, and the press roll surface scratches and engraved designs are embossed on the nylon film surface.

Example 2 In FIG. 2, melted low-density polyester is extruded from the extruder (1) of the extrusion coating equipment onto a nylon film fed from the delivery side, and is then extruded onto the cooling roll (1). The laminated film is then sent to the winding side and wound up.

At the time of this 81 layer, the nylon film was softened by the heat of the molten low-density polyethylene, and an uneven pattern was formed on the surface between the booth wheel and the guide wheel (4). An uneven pattern is pressed onto the oilon film surface by the sheet.

[Brief explanation of the drawing]

FIG. 1 is a schematic view of a coating section showing Example 1 of the present invention, and FIG. 2 is a schematic view of a coating section showing Example 2, in which a sheet is applied in the form of a belt to a press roll and Gaitronil. (S is extruder, (fable) is cooling roll, (1) ζ-/res roll, (4) is guide roll drawing i!) (inside "ii1..: No change) Fang 1
Teeth 20- ゛Procedural amendment (method) Mr. Commissioner of the Patent Office 1, Indication of case 1982 Patent application No. 0.45447
No. 2, Title of the invention: Method for manufacturing uneven pattern packaging film 3, Person making the amendment Relation to the case Patent applicant Address (residence) 1-7-23-4 Kinjo, Kita-ku, Nagoya Date of amendment order: 1982 June 11, 5, subject to amendment
Drawing surface 6, content of amendment Engraving of drawing (no change in content) 283
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Claims (1)

[Claims] By extruding the polyolefin tree layer and coating it on the film base material, at the same time, when passing the cooling roll and the press roll in contact with each other, the press roll 9 is coated with a desired three-dimensional shape on the surface. A manufacturing method characterized by cooling the film and molding the film surface of the base material at the same time.