DE7025123U - SHRINK PACKAGING, IN PARTICULAR FOR CRUSHBREAD. - Google Patents

Description

Patent Attorneys Dipl.-Inc. F. Weickmann,

Dipl.-Ing. H. Weickmann, Dipl.-Phys. Dr. K. Fincke Dipl.-Ing. F. A. Weickmann, Dipl.-Chem. B. Huber

8 MUNICH 27, DEN

MDHLSTR \ SSE 22, CALL NUMBER 483921/22

C XIV /

Kraft GmbH, Lindenberg i. Agllgäu

Shrink packaging, especially for crispbread.

The present innovation relates to a packaging unit, in particular for crispbread, with a shrink tube cover, which is multilayered by folding in individual areas.

Shrink packaging is widely used today, the essence of such shrink packaging is that the packaging material in the Production is stretched and later shrinks under the action of heat. The shrink film with the . contained Y / are is heated in a tunnel oven, so that the foil almost melts. This is followed by cooling to normal temperature, which causes the film contracts and is firmly attached to the goods.

However, such shrink packaging can only be produced

when the air in the "packing space" escapes can .. For this reason it was "not previously possible to use shrink packaging for such goods, which are later to be stored in the absence of air. When the shrink film over the goods is impermeable to air was sealed, so the air in the pack "expanded", with the Shrinkage necessary heating in the tunnel furnace in such a way that during the subsequent shrinkage under Normal temperature the pack does not hold up tightly enough the goods.

The present innovation has now set itself the task of a packaging unit with a shrink sleeve to create also for those cases in which the goods after the shrink wrapping under Should store air exclusion. To solve this problem, according to the present hiring, a packaging unit of the type mentioned provided that at least one of these areas Opening is provided in an inner layer, which is used during the heating for shrinking leakage of air from the shrink sleeve and is closed by the shrinkage of the overlying layers. Because of this automatic sealing of the air hole can result in a further sealing of the with a shrink sleeve e enclosed packaging unit is omitted * like it "Up until now it was always necessary when using shrink tubing packaging for goods to be stored under airtight conditions. *

The refinement according to the invention comes with a packaging unit with an airtight shrink tubing, the end faces of which are polygonal or round cuboid

Sections overlapping the stack of packaged goods are folded in one after the other from two first opposite sides and then from two perpendicular second sides over the end faces of the stack of packaged goods portions an opening is arranged at least so that it is completely covered by the starting chosen from _t two second side edge portions.

In a further development of the innovation, the shrink tubing cover should consist of a welded along a surface line, formed a sheet of polyene and after folding in the abutment sections from the first sides through sections lying parallel to the end faces Weld seams to be closed

Due to the shrinking of the film after it has been heated in the tunnel oven, those from the two sides are laid down Sections taut over the air outlet holes the air could escape from the inside of the packaging unit when heated in the tunnel oven, so that the Air outlet openings are closed. A particularly good closure of the air outlet openings can be achieved if the heating of the shrink film in the tunnel furnace is chosen to be so great that the openings for air penetration Covering areas of the shrink film to those containing the passage openings melt the lower areas. In order to avoid the too much heating of the shrink film to damage packaging goods or to run the risk, that the shrink film sticks to the goods themselves, is provided in the development of the! that at least those packaged goods surfaces "over which the openings of the shrink sleeve are to lie

come inside the very sump with a Layer on the packaging material are preferably covered from paper or cardboard. With such an arrangement there is, for example, the possibility of overheating the end faces in the tunnel furnace. Luxta'tr-to blow, so that the film material on the end faces so far The multilayer areas become superficial glue together.

To the goods to be packed after the shrink wrapping to be able to control from the outside and to enable buyers to It is still possible to be able to convince yourself of the condition and appearance of the goods provided that at least one surface of the stack of packaged goods by a single-layer surface area of the Shell is visible.

Based on the in the figures of the drawing, schematically illustrated embodiment, the innovation is explained in more detail below with further features will. It shows:

Figure T one inserted into a shrink tube sleeve

Stack of packaged goods, · FIG. 2 the arrangement according to FIG. 1 after wrapping

and welding the very sump sleeve at the ends and
FIG. 5 shows the finished packaging unit after shrinking.

In Figure 1 you can see a cuboid packaged goods stapsl 1, for example made up of stacked Consists of crispbread slices. This stack of packaged goods is surrounded by a shrink tube 20 protruding beyond the end faces 2, which advantageously from a sheet of foil wrapped around the stack

is formed, which is welded along a weld 21 to form this piece of hose. To manufacture of the finished shrink packaging Y <". ^ de ~. the about the first side edges 3 of the Stiinfläeher 2 protruding Areas 5 knocked in in the direction of arrows 8, including lateral displacement devices with a movable one arranged along a conveyor belt Can serve stamp. In each of these sections 5 air passage openings 7 are introduced or are generated when hammering in by means of mandrels arranged on the aforementioned punches the areas 6 partially turned inward from the sides 4 of the end faces 2 lying perpendicular to the sides 3, so that the marginal edges lie on top of one another and to form a closed one, only through the openings 7 interrupted shell can be welded along a weld seam 22.

After the heat-shrink tubing sleeve 20 has been heated and shrunk, it originally loosely wraps itself around the stack of packaged goods was arranged, taut, the shrink tubing sleeve in the 10 designated triangular areas has three layers, the lowermost layer containing the air outlet openings 7. The openings 7 serving for the exit of the heated air when the arrangement is heated in the tunnel furnace automatically closed again when shrinking.

As already mentioned, when shrinking, there can be a particularly strong sticking or melting together This multilayer areas can be achieved by having the end faces during transport through the The tunnel furnace is particularly heated. In order to avoid sticking to a stack of packaged goods or a To prevent damage due to excessive heating of this stack, the end faces 2 can through

Packaging material to be covered, preferably done by a non-illustrated Ta it.-Linked oils that Yorteiltiafterweise may be printed with information and Werbeangabert ₅ By ■ heat exposure raises the film as far back as de ports 7 up to a pinprick size; Pull the opening together. The multilayered Berej o> - ~; . cover these openings like a valve. In the case of the stack of packaged goods preferably consisting of stacked crispbread slices with a printed banderole, the lateral surfaces 11 remain visible through a single-layer area of the cover, so that the customer can immediately look at the goods from the outside and inspect them.

- Protection claims -

Claims (6)

Protection claims 1. Packaging, ': o.gseinheit, especially for crispbread with a. ^ .. Trumpf hose cover, which by folding in individual areas is multilayered, characterized in that at least in one of these areas (10) an opening (7) is provided in an inner layer (5) which is used for shrinking during the Heating causes air to escape from the shrink sleeve and is closed by the shrinkage of the overlying layers. 2. Packaging unit according to claim 1, with an airtight Shrink tubing, the end faces of which of a cuboid, polygonal or round stack of packaged goods first opposing sides and then from zv / ei perpendicular to the second Pages out over the end faces of the stack of packaged goods are struck, characterized in that at least in one of the first sides (3) from inwardly folded lower sections (5) at least one opening (7) is arranged so that it is of the sections (6) which are knocked in from the two second side edges (4) are completely covered. 3. Packaging unit according to claim 1 or 2, characterized in that that the shrink tubing cover (20) is made from a wrapped around the stack of packaged goods, film web welded along a sheet line (21) is formed. 4. Packaging unit according to one of claims 1 to 3 ₍ characterized in that the shrink tube sleeve is welded to the end faces (2). 5. Packaging unit according to one of claims 1 to 4 »characterized in that at least those packaging goods surfaces (2) over which the openings (7) of the shrink tube cover (20) are to lie kcinnien within the shrink tube cover with a layer of packaging iterial, f "b are covered _o 6. Packaging unit according to claim 5 »''. Characterized in that that the packaging material is paper or cardboard. 7β packaging unit according to one of claims 1 to 6, characterized in that at least one surface (11) of the stack of packaged goods (1) is covered by a single-layer The surface area of the casing (20) is visible.