DK143262B - FILM OF ALUMINUM OR AN ALUMINUM ALLOY FOR PACKAGING PREPARATION AND PROCEDURE FOR ITS PREPARATION - Google Patents

Description

os) DENMARK

| p (12) PUBLICATION MANUAL OR U3262B

DIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Application No. 3734/76 (51) Int.Cf.3 B 65 D 65/42 (22) Submission date 19 * au £ · 1976 B 44 0 3/22 (24) Race day 19 · Aug · 1976 (41) ) Aim, available Feb. 26. 1977 (44) Presented 3 Aug. 1981 (86) International application no. - (86) International filing day - (85) Continuation day - (62) Master application no. -

(30) Priority Aug 25 1975 * 2557746, DE

(71) Applicant SWITZERLAND ALUMINUM AG, 5965 Chippis, CH.

(72) Inventor Walter Geler, DE.

(74) Associate Engineer Glerelng & Steninger.

(54) Aluminum foil or an aluminum alloy for packaging purposes and methods for its manufacture.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum foil or an aluminum alloy seal for the coating of fatty filling material, in particular to melted cheese packaging film, with a lacquer film coated surface. sections from their rollers placed in a packaging machine * These foil sections often bend out of plan in the supply ducts and cause disruptions to operation. Manufacturers of Packaging Machines J - · Attempt to Address These Difficulties By equipping the machines with means for deforming or holding down the film pieces. However, the technical possibilities for such improvement have been found to be limited. In view of these facts, the invention aims to provide a film of the kind mentioned in the first paragraph, avoiding the known disadvantages and a method by means of which such a foil can be produced rationally without a roll-up of packaging, in particular of cheese *

According to the invention, this task is solved by means of a foil which is coated on both sides with a guide, and at least the lacquer facing the filling material is provided with through-going ribs which form between them. The ribs make the foil stiffer and thus enable high processing speeds in the wrapping * Ribs in the longitudinal direction of the foil web cause a directionally stable drain of the foil from the roll. A groove in the transverse direction of the foil web prevents the so-called "gutter formation" at narrow roll widths. According to the invention, the grooves and ribs can be formed in a further lacquer layer which is applied to an adjacent lacquer laminate layer. A further stiffening of the foil can be obtained.

The invention further encompasses a method of making the present film. The method according to the invention is characterized in that an aluminum foil on at least one of its main surfaces is provided with a lacquer layer, to which a further covering layer is applied during simultaneous forming of grooves and ribs in this layer. The forming of the grooves - and thus of the ribs - can in principle is done by some kind of embossing, but according to the invention, the substantially simpler measure is preferred that the grooves and ribs are formed by varnish application in different amounts at the grooves and ribs respectively. This can be realized according to the invention in a simple way by passing the foil over a rotating roller provided on its circumference and applying a varnish layer on the foil side facing away from the roll in such a way that the varnish temporarily presses the foil into the roll grooves. Thus, a greater amount of varnish is collected in the pressed places than in the other places, and when the foil again straightens after leaving the roll, these larger varieties of varnish form the ribs.

The width and depth of the grooves and ribs can be adapted to the requirements dependent on the packaging material.

The invention is further explained in the following with reference to the drawing, in which FIG. 1 shows a partially wrapped wrapping film, partially cut away from its roll, FIG. 2, on a larger scale, a longitudinal section along the line II-II in FIG. 1, FIG. 3 is a side view of a manufacturing device; and FIG. 4 is a larger scale of FIG. 3 within the field IV.

One according to FIG. 1 on a roll of wrapped packaging film for melted cheese has on its aluminum foil body 2 partly a protective lacquer layer 3 and on the opposite foil surface which comes into contact with the non-viscous material for clarity, a basic lacquer layer 4. This is coated with a forming Rows 5 between through ribs 6 applied to cover layer 7 ·

To produce the film 2, it is passed over a pressure roller 9 provided with a caulking sheath 8, which is in engagement with a color roller 10, the surface of which is provided with a liquid lacquer layer 11 by means of a non-applied coating device.

The film 2 running in the Z direction is pressed under the influence of the color roll 10 and its lacquer layer 11 into the grooves 12 of the rubber jacket 8, which causes a larger number of lacquer particles to be received from the color roll 10 on the film 2 with lacquer 11 than at the other foil regions, whereby the longitudinal ribs 6 are formed.

By means of the rifles 12, as shown in FIG. 4 may be arranged axially parallel or circularly in the chewing gum sheath 8, the film 2 is slightly deformed in the pressure region 13, which is not shown in the drawing, however.