DE2143953A1 - Packaging for photosensitive liquid - Google Patents

Description

WERNER COHAUSZ * OHA ^. WlLHELM FtORACK. WpL-I ^ RUDOLF KNAUF Dipl.-Ing. Poul Arne Thymark September 1, 1971 LemchesveJ 6 DK-2900 Hellerup / Denmark

Packaging for light-sensitive liquids

The invention relates to a packaging for photosensitive Liquids, especially milk, consisting of a thermoplastic material produced by extrusion Bag.

Various liquids, such as milk, change in certain constituents and / or in their color in an undesirable manner under the action of light after a shorter or longer period of time. It is known that such changes are caused by Storage of the liquid in containers that are opaque or only slightly translucent can be reduced. For example, you have bottles in suitable color and wall thickness are used. Thus, good results have been obtained in keeping milk under exposure of daylight In glass bottles with a strong brown color and a wall thickness of about 3 mm. In addition to the aligning light protection, it was also possible to observe the contents of the bottle from outside. This possibility is for of importance to the consumer because he wants to find out about the contents of the bottle.

20 · »12 '/ 1043

2U3953

For some time it has been switched to bag-shaped ones Containers for storing milk to be used, which are made of thermoplastic plastic films with a wall thickness of passed about 0.1 mm. Such packaging does bring about a cost saving on the production side, however, the very thin-walled packaging does not provide sufficient protection from light. One might think of that now To give the packaging sufficient protection from light by means of a corresponding dark coloration of the film. That would give the consumer but taken the option of the contents of the packaging to be observed from the outside.

The invention is based on the object of creating a package for light-sensitive liquids that includes Retaining the advantages of thin-walled; Bags made by extrusion of plastic films are, on the one hand, sufficient enables effective light protection, and on the other hand, the content is viewed from the outside by the consumer Vierden can.

This task is according to the invention when the The type mentioned at the outset is achieved in that the first bag or bags are in a second one, likewise by extrusion ™ made of a thermoplastic plastic bag are used, and that the inner and the outer Bags in color and wall thickness are coordinated so that both bags together provide sufficient light protection for the liquid enclosed in the inner bag, with the light transmission of the inner bag sufficient to view the liquid from the outside;

The outer bag preferably has a higher tear strength than the inner bag and carrying handles.

- 3 - 209812/1043

2U3953

The particular advantage of the invention is that the light-sensitive liquid is both sufficiently protected against the effects of light and the consumer has the possibility of observing the liquid content of the packaging from the outside during consumption. This effect is based on the fact that the daylight is subjected to a double filtering process before it reaches the liquid in the inner bag (s). This is because the light rays first have to pass the brownish-colored wall of the outer bag, some, but not all, ultra-fine rays being absorbed. The remaining rays are then absorbed, except for a harmless part, by the colored edge of the inner bag; in practice, the distribution ratio of the light-absorbing properties of the inner bag and the outer bag is usually chosen so that the inner bag is as clear as possible ₃ to allow the consumer to see the contents of the inner bag

st

to facilitate. ^T inline possible clear transparent inner packaging is also from the point of significance that the inner bag during use frequently in a stiff, can-like, opaque, only open-topped container is kept.

The invention is described in greater detail below with reference to a drawing explained. Show in detail

1 shows a filled package in a side view

FIg. 2 the packaging according to FIG. 1 in section along the line A-A;

Fig. 3 shows the packaging of FIG. 1 in section according to the Line B-B.

209812/1043 - - ή -

BATH ORIGINAL

2U3953

The packaging consists of an inner bag 1 and an outer bag 2. The two bags I ₄ 2 are produced by extrusion of a thermoplastic material. The shape of the bags 1, 2 is tubular. The two bags 1, 2 are closed at the top and bottom by zip seams 3 »*** 5» 6. On the outer bag 2, which is Zerreissfestig- as the inner bag I ₁ 1st connected that in the region of the upper Sehweissnaht 6, a carrying handle 7 ness higher.

The liquid 8 enclosed in the packaging, e.g. milk, is through the inner bag 1 and through the outer bag 2 protected against light. For this, both the inner bag 1 and the outer bag 2 are colored. The inner bag 1 and the outer bag 2 are coordinated in terms of color and wall thickness so that they are both effective together men light protection result, the light permeability of the inner bag 1 is selected so that after removal of the Outer bag 2 the liquid 8 can be observed from the outside through the colored wall of the inner bag 1.

Patent claims:

209812/1043

Claims (2)

Dipl.-Ing. Poul irne Thymark September 1, 1971 Lemchesvej β DK-2900 Kellerup / Denmark Pat ent claims Packaging for light-sensitive liquids, in particular Milk, consisting of a bag made by extrusion of a thermoplastic, thereby characterized in that the first bag (s) (1) in a second, also by extrusion of a thermoplastic Plastic-made bags (2) are used, and that the inner bag (s) (1) or the outer bag (2) in color and wall thickness so on top of each other are coordinated that both bags 1, 2 together provide sufficient light protection for the inner bag (1) provide enclosed liquid (8), the light permeability of the inner bag (1) being sufficient, to view the liquid (8) from the outside. 2. Packaging according to claim 1, characterized in that the outer bag (2) has a higher tensile strength than the inner bag (1) and carrying handles (7). 25 276
K / KÖ 209812/1043 Blank page