ES2313759T3 - PROCEDURE FOR MANUFACTURING A PLASTIC SHEET WITH AN ANTI-ADHERENT COATING. - Google Patents

Abstract

Pressed regions (3) of the sheet (1) are left clear of the anti-adherent silicone coating.

Description

Procedure to manufacture a plastic sheet with a nonstick coating.

The invention relates to a method for manufacture a plastic sheet with a non-stick coating, in particular silicone, and to a process for manufacturing a wrapping with marginal closure strips stamped from one plastic sheet portion.

Wrappers of this type are already known and the corresponding plastic sheets, but they all have as disadvantage that stamped closure strips can only be manufactured with a lot of difficulty and with special procedures, in most of cases an expensive needle procedure.

For example, US 5333493 gives know a similar packaging sheet that has partial areas covered with a non-stick coating.

The document US-A-5033250 discloses the use of repetitive brands to control a packaging machine in what Regarding the expansion behavior of the envelope to be processed, at speed, etc.

The invention aims to propose a procedure to manufacture a plastic sheet and a process for manufacturing wrappers from said sheet of plastic, in which the strips not covered by the lining non-stick be positioned with such accuracy that it makes possible a arrangement on two opposite edges of a portion respectively, and in which the manufactured wrapper can be closed securely and That is also durable.

This objective is achieved according to the invention. leaving partial areas non-stick coating of the portions of the sheet on which printing is provided, distance marks are provided that are defined to control the coating with non-stick agent on the sheet, joining mutually at least two partial zones of the sheet portion devoid of non-stick coating, providing areas devoid of non-stick coating in one direction essentially transverse to the transport direction of the sheet not yet divided into portions, and the union of the partial areas in the form of a so-called corrugated one in which numerous individual prints in the form of line.

Thus, in the area devoid of non-stick coating can be placed a closure strip stamped and can be easily made continuously foil portions for wrappers. It is also possible a control very precise of the surfaces of the coated sheet non-stick and devoid of it.

This ensures an improved closure and Safer packaging.

It also ensures the maintenance of the union mutual of the partial zones.

It is also advantageous that the union of the Partial zones are performed as an additional seal.

Thus, in the case of sheets susceptible to sealed you can make a secure connection of the partial areas each.

The invention is illustrated in the drawings by An example of realization. In the drawings:

Figure 1 shows a continuous sheet for make a wrapper and

Figure 2 shows a wrapper produced with A portion of foil.

Figure 1 shows a continuous sheet 1 that It has a non-stick silicone coating in areas Partial 2. Other partial zones 3, which are among the partial zones 2, are devoid of such treatment with silicone. On continuous sheet 1, marks of reference 4 for control and positioning during application of the silicone treatment in the first partial zones 2 of the continuous sheet 1.

To form a wrapper 10, the sheet continues 1 is cut along lines 5. The resulting portions 6 they are used to wrap an object 11 to be packed and the layers overlapping portions 6 corrugate each other in the zones devoid of non-stick coating 3.

This corrugated 12 is constituted by individual line-shaped prints that grip the two layers joining them together.

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References cited in the description

The list of references cited by the applicant is only for the utility of the reader, not forming part of the European patent documents. Even when the references have been carefully collected, cannot errors or omissions excluded and the EPO rejects all responsibility In this regard.

Patent documents cited in the description

US 5333493 A [0003]

US 5033250 A [0004]

Claims (2)

1. Procedure for manufacturing a sheet of plastic (1) and procedure for manufacturing a wrapper (10) a from a portion (6) of this plastic sheet (1) with a non-stick coating (2), in particular silicone, with strips stamped marginal closure (12), in which partial areas (3) of the portions (6) of the sheet (1) in which the stamped (12) are devoid of lining non-stick, markings (4) being provided at defined distances to control the coating with nonstick agent in the sheet (1), joining at least two partial zones (3) of the portion (6) of the sheet (1) devoid of coating non-stick, said areas (3) being devoid of non-stick coating in one direction essentially transverse to the transport direction of the sheet (1) even without divide into portions (6), and the union of the zones being carried out partial (3) in the form of a so-called corrugated (12) in which numerous individual prints in the form of line. 2. Method for manufacturing a wrapper (10) according to claim 1, characterized in that the joining of the partial zones (3) is carried out as an additional seal.