FI69287C - FOERPACKNING FOER UPPLAGRING AV LIVSMEDEL - Google Patents

Description

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(51) Kv.ik // int.ci. * B 65 D 81/2 ^, 65Λ0, 30/08 FINLAND —FINLAND (2.1) Patent application - Patentansökning 802028 (22) Application date - Ansökningsdag 25.06.80 (F ») ( 23) Starting date - Glltighetsdag 25.06.80 (41) Made public - Blivit offentlig 26.12.8l

National Board of Patents and Registration Date of publication and publication Publication— 3O.O9.85

Patent and registration authorities Ansökan utlagd och utl.skriften publicerad (32) (33) (31) Privilege requested — Begird priority (71) Tsentralnaya Experimentalno-lssledovatelskaya Konstruktorsko-Tekhnologicheskaya Laboratoria Khimizatsii US, 5) (72) Sergei Leonidovich Kalachev, Moscow,

Anatoly Mikhailovich Nikitaev, Moscow, USSR (SU) (7 * 0 Oy Kolster Ab (5 **) Food packaging -Förpackning för upplagring av livsmedel

The present invention relates to the food industry as well as to agriculture, in particular to packaging used for food storage.

The package according to the invention can be used as a container for the storage and handling of agricultural products, fruits, vegetables, grains, fodder, etc.

It is a well-known fact that issues related to the handling and efficient storage of food and agricultural products in general have become truly vital all over the world. In practice, this means that inadequate storage of various agricultural products results in a global waste rate of 10-30% of the quantity produced.

According to statistics, 20% of all food produced in the world is spoiled, either in part or in full, by incomplete 69287 packaging or storage tanks.

There is therefore a need to develop packaging that allows food to be handled and transported, as well as stored efficiently, while preserving its nutritional value and original taste.

One good method for efficient storage of fresh food is the use of specially designed closed refrigerated containers. The tank then contains an 'adjustable' gaseous substance characterized by a low nitrogen and carbon dioxide content.

However, the manufacture of such tanks requires quite a bit of capital and also complex equipment to control the gaseous material, not to mention the expensive and complex use of the tanks.

In addition, various packages are known which are used for the storage and handling of foodstuffs, specifically for the preservation of feed. Such containers have several layers of paper and an additional layer of polymer. Such packages are already widely used all over the world and are called kraft paper bags. More than 500 million such sacks are manufactured annually in Finland alone.

However, in this type of packaging, fresh food cannot be stored and handled long enough and efficiently enough because multilayer packaging comprising a polymer layer makes the kraft paper bag air impermeable, potentially eventually causing complete food spoilage.

The present invention therefore seeks to eliminate the above drawbacks.

The main object of the invention is to develop food packaging in which foodstuffs and fresh agricultural products can be handled and stored efficiently for long periods of time so as to maintain their high nutritional value. This is again achieved by developing a so-called self-regulating gas substance.

It is therefore an object of the invention to provide packages designed for the storage of foodstuffs in which fresh agricultural products and foodstuffs are preserved as good I! 69287 also in long-term storage, while the nutritional value of the products then remains unchanged.

This is again achieved by developing a food package with several layers of material, one of which is a polymer layer. The package is characterized in that there is at least one gas control film between the actual material layers of the package, the polymer layer being perforated at this gas control film.

However, the gas control film is protected on at least one side by an air-permeable layer.

Thanks to the gas control membrane, the in a food package in which the film is placed between the polymer layer and the actual material layers of the package, the gaseous material can be adjusted so that the package is ideally suited for handling agricultural products and food in general and also for long-term storage.

The invention will now be described in more detail by means of structural examples with reference to the accompanying drawing, in which Figure 1 is a perspective view of a multilayer package with gas control films; they are arranged as required by the invention, Figure 2 is a cross-section of the of the package in its original folded form, Fig. 3 shows the package of Fig. 1 with the gas control film provided with an air-permeable liner, and Fig. 4 is a section of a filled food package; the gas control membrane is now protected on both sides by air-permeable layers.

The package according to the invention (Fig. 1) has several layers of paper or fabric 1 and a polymer film 2. Between the layers there is at least one gas control film 3. It can be e.g. silicone rubber placed as a thin layer on a textile base, e.g. woven from capron yarn. the canvas. Alternatively, other gas control films can be used, e.g. polyvinyl-trimethylsilane-based films.

The gas control film 3 can be placed anywhere in the package (Fig. 2). In the case of the film 3, holes (perforation) are preferably made in the polymer film 2. Likewise, the outer layer 1 of the package can be perforated from this area.

4 69287

The packaging is used for food storage as follows:

The food to be stored is first placed in a polymer film bag 2 (Figure 1), after which the package is sealed either by tying or heat sealing. The actual inner part of the package, which is filled with the fresh food product in question, e.g. grains, then forms a suitable gas with a low oxygen content (2-10%) and a high carbon dioxide content (1-5%) as well as a high nitrogen content (87-97%). , because foods absorb oxygen and generate carbon dioxide, and in addition, because the gas control membrane 3 'selects' these suitable gases just right. This makes it possible to effectively prevent any biochemical processes that might otherwise contaminate the foodstuff in question.

When a fine product, e.g. various grass seeds, is placed in the package, the gas control membrane 3 may be damaged. In addition, po. the active range of the membrane may be reduced when it contacts the gas control membranes of adjacent packages or otherwise becomes clogged due to a fine-grained product.

In order to prevent the harmful effects of such phenomena, it is necessary to protect the film 3 (Fig. 3) on at least one side with a suitable air-permeable lining 4, e.g. a polymer net.

The gas control film 3 can also be protected on both sides by air-permeable layers 5 and 6 (Fig. 4), whereby an air gap is formed between the film 3 and the air-permeable walls 5 and 6, which further improves the storage conditions of the product in question.

Experiments with packages constructed according to the invention have shown that the percentage of waste associated with food storage has now decreased 4-5 times, the deterioration characteristic of food has decreased to one tenth, the drying of food has been completely eliminated, the nutritional value and taste of products have remained unchanged. In addition, the work involved in storing products has decreased quite significantly.

The invention can be utilized economically and efficiently precisely when the package is used for the storage of cereal and oilseeds, since the seeds and grains cannot dry out in them, but retain their vital energy, which in turn

II

5 69287 increases the yield by 10 to 20%.

In another practical experiment, the invention saved 400 rubles by storing a ton of garlic in such a package.

In the multilayer packages now presented for the storage and handling of fresh agricultural products -ts. new kraft paper bags and packages made in accordance with the invention - may have different structures, e.g. open or flap structures. The volume of the packages may also vary, e.g.

1 - 1000 kg.