Laminated packaging material to create heat-treatable packing container

FIELD: packing means, particularly containers.

SUBSTANCE: laminated material 30 comprises rigid bendable substrate 31 made of paper or cardboard, external water-tight coverings 32, 33 and aluminum gas-barrier foil 34 located between substrate 31 and one external covering 32. Laminated material comprises at least one additional layer 35 used as gas-barrier between substrate 31 and aluminum foil 34. Additional layer 35 is connected to substrate 31 through intermediate or adhesive layer 36. External coverings 32, 33 and intermediate or adhesive layer 36 are made of polypropylene. Packing container and product packing method with the use of the container are also disclosed.

EFFECT: possibility to prevent or compensate container gas losses through aluminum foil cracks or similar tightness failure caused by stresses, especially by ones appearing during container production of described packing material.

12 cl, 3 dwg

 

The present invention relates to the packaging laminirovannom material for thermoablative packaging container containing the main (base) layer, the outer waterproof coating and aluminum foil between the base layer and one outer coating, which serves as a barrier to gases.

The packaging material of the type described is known, for example, from international publication WO 97/02140. Known packaging material has a rigid, but bendable base layer of paper or paperboard and outer waterproof coating from moisture and heat resistant plastic material on both sides of the Central layer. To make known the packaging material gazoballonnyj properties, in particular with respect to gaseous oxygen, the packaging material further comprises aluminum foil, which serves as a barrier to gases and which is located between the paper or paperboard layer and one outer plastic coating.

Known packaging laminated material is made thermoablative packing containers with a filling machines of this type, which from a cloth or blanks of packaging material to form a filled and sealed ready packaging in accordance with the so-called process of forming the s/filling/sealing, well-known in the packaging field.

For example, from a flat folded tubular blanks from the known packaging material made of the packaging container capable of withstanding the heat treatment, by which the first workpiece packaging transforms into an open tubular container, which is sealed at one end by bending and TermoSanitari continuous bend the end panels of the package with the formation of essentially flat closed bottom. Shipping box with bottom, fill in the appropriate information, for example a food product through the open end, which is then sealed additional bending and TermoSanitari respective end panels of the package with the formation of essentially flat closed top. Then filled and sealed, usually parallelepipedic packing container is ready for heat treatment to impart Packed content or food product with extended shelf life in closed packaging container.

Heat treatment, prolong shelf life, it is expedient to carry out and under such conditions as described in international publication WO 98/16431, which is incorporated into this description by reference. In this case, the packaging container is placed in an autoclave and load the live in it with the first gaseous environment, flowing in contact with the outer walls of the packaging container, for example, hot steam, to a temperature usually in the range of 70-130°C. after a predetermined exposure time at the selected temperature of the gaseous medium is stopped. The packing container is cooled second circulating gaseous medium, for example cold air, and finally recirculating liquid medium, for example cold water. The cooled heat-treated packaging container is then removed from the autoclave for storage, transportation and/or other actions.

Although the packaging container of known packaging laminated material usually withstands harsh heat treatment in the autoclave, however, it often happens that aluminum foil included in the material as hashbarger, when converting a packing material in the packing container is exposed to such high stresses that it forms cracks in areas of the packaging material, which are exposed to such stresses. Cracking-susceptible strains aluminum foil leads to the fact that the packaging container, respectively loses its tightness against gas, which therefore can penetrate into the packaging container and in contact with the Packed product the drive. The problem of unwanted penetration of gases through cracks caused in the aluminum foil becomes especially serious when the packaged product is particularly sensitive to gases, such as gaseous oxygen, which can very quickly ruin the product and make it unusable.

Therefore, the present invention is to eliminate the above disadvantage of the known packaging laminate material.

Another objective of the present invention to provide a packaging laminated material of the type described, which can easily convert flexion and TermoSanitari in thermoablative packaging container without the risk that the packing container will lose the desired tightness against gases, in particular gaseous oxygen, even if sensitive to stresses aluminum foil is subjected to cracking and similar damage during bending of the packaging material.

Another objective of the present invention is to create thermoablative packaging container obtained from a laminated packaging material for perishable and sensitive to gaseous oxygen food.

These and other objectives and advantages will be pros who rely according to the present invention using a laminated packaging material according to item 1 of the claims and of the packaging container, made of this packaging material according to item 8 claims. Preferred embodiments of the packaging material according to the invention have the characteristics set forth in dependent clauses 2-7.

Thus, the present invention relates to the packaging laminirovannom material for thermoablative packaging container containing a base layer, outer waterproof coating and aluminum foil, which serves as a barrier to gases and is located between the base layer and one outer coating, and packing material to improve the gas-tightness includes an additional layer serving as a barrier to gases, between the base layer and aluminum foil.

The present invention also relates to thermoablative packing container for perishable and sensitive to gaseous oxygen product obtained by bending and welding of the packaging material according to the invention.

Below the present invention is described in more detail with reference to the accompanying drawings. In the drawings:

Figure 1 - schematic view of the overall structure of the known laminated packaging material for thermoablative packaging container;

Figure 2 - schematic view of the overall structure of the packaging material for thermo is obrabatyvaemogo container according to the first variant implementation of the invention, and

Figure 3 - schematic view of the overall structure of the packaging material for thermoablative container according to another preferred variant implementation of the invention.

Detailed description of embodiments and the accompanying drawings

Figure 1 shows the General structure of the known packaging material 10. The packaging material 10 includes a rigid, but bendable base layer 11 of paper or paperboard and outer waterproof coating 12 and 13 on both sides of the base layer 11. The packaging material 10 also has an aluminum foil 14, which serves as a barrier to gases and located between the base layer 11 and one outer water resistant coating 12.

Of the known packaging material 10 is made thermoablative packaging container in a known manner by folding and heat sealing sheet, or in the form of cloth, the packaging material 10. For example, from a flat folded tubular blanks thermoablative packing container is manufactured by first forming an open tubular carton, one end of which is sealed by bending and welding a continuous bending of the end panels of the package with the formation of essentially flat closed bottom. Packing box with a closed bottom is filled with testwuide content for example, the food product through the open end, and then her form essentially flat closed top additional bending and TermoSanitari respective continuous, fold the end panels of the package. Filled and closed so the packing container, usually with parallelepipedal form, then ready for heat treatment in an autoclave to give a Packed content or nutritional product of the so-called long term storage in a closed packaging container.

The problem inherent in the known packaging material 10, is that, as already discussed above, the aluminum foil 14, which is included in the packing material may crack due to their sensitivity to the effects of stress, especially in those areas where the impact of stress on aluminum foil is especially great in the conversion process of the packaging material in the packaging container, and the resulting container loses its gas impermeability. Mentioned cracks and similar leakage aluminium foil packaging material in some cases can be so extensive and severe that the packaging container is completely unusable, especially if the packaging container purpose is for storage of perishable and the oxygen-sensitive products, which will rapidly deteriorate and lose its quality when in contact with gaseous oxygen.

The problem with the above known packaging material 10, is solved in a simple way and involves the use of simple tools in the packaging material according to the invention, having the structure schematically shown in figure 2.

The packing material 20, as shown in figure 2, similarly contains rigid, but bendable base layer 21 made of paper or paperboard and outer waterproof coating 22 and 23. Between the base layer 21 and one outer water resistant coating 22 of packing material 20 contains aluminum foil 24, which serves as a barrier to gases.

The packaging material 20 according to the invention differs from the packaging material 10 according to the known technical solution in figure 1, in particular, the fact that it contains, between the aluminum foil 24 and the base layer 21, the additional layer 25 serving as a barrier to gases, in order to compensate for or counteract the influence of possible cracks that may occur in the aluminum foil 24 in the formation of the material 20 of the packaging container.

Preferred materials for additional or auxiliary gatbering layer 25 in the packing material 20 according to the invention can be selected from the group, mainly in the with a polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET films), copolymers of cyclic olefins (CES), polyamide (PA), amorphous polyamide (APA), liquid crystal polymers (ICP), copolymers of ethylene and vinyl alcohol (SAWS) and polyvinyl alcohol (PVA), which can be deposited on a thin substrate, such as paper.

Outer waterproof coating 23 may be made of plastic selected from the group, mainly comprising polyethylene (PE), polypropylene (PP) and complex polyester (PES), or a mixture thereof. Examples suitable for use polyethylene plastics can be high-density polyethylene (HDPE) or linear low density polyethylene (LLDPE), an example suitable for use polypropylene plastic may be oriented polypropylene (OPP), and an example suitable for use closepreview plastic may be amorphous complex polyester (APAF).

Preferably moisture-proof coating 23 consists of physical or mechanical mixture of polypropylene (PP) and polyethylene (PE), which in addition to the excellent moisture resistance also has sufficient moisture and heat resistance to withstand the harsh combination of moisture and heat that occur during normal heat treatment in an autoclave to ensure a long shelf life. In addition, externally the floor 23 of the physical or mechanical mixture of polypropylene (PP) and polyethylene (PE) has excellent properties for printing and at the same time provides a mechanically strong and water-resistant seams when the sealing in the molding process of the packaging material 20 thermoablative of the packaging container.

The thickness and the number of external waterproof coating 23 can vary within wide limits, but is usually 25-45 g/m2.

Accordingly, water resistant outer coating 22 may consist of a plastic selected from the group, mainly comprising polyethylene (PE), polypropylene (PP), complex polyester (PES) and their copolymers. An example suitable for use polyethylene plastic may be a high density polyethylene (HDPE) or linear low density polyethylene (LLDPE), and an example suitable for use closepreview plastic may be amorphous complex polyester (APAF).

Preferably moisture-proof coating 22 of copolymers of propylene and ethylene has sufficient moisture and heat resistance to withstand the combined impact of moisture and heat that occur during normal heat treatment in an autoclave to ensure a long shelf life. In addition, the coating of a copolymer of propylene and ethylene provides a mechanically strong and water-resistant seams in the process of formation of the packaging material 20 of the packaging container.

The thickness and the number of the outer cover 23 of the plastic may vary within wide limits, but the usual is 25-35 g/m 2.

Although the packaging container obtained by bending and welding of the packaging material 10 according to the known technical solution in figure 1, often loses its desirable gas-tight properties, in particular, gaseous oxygen, due to the occurrence of cracks, which may be formed in the aluminum foil 14 during formation of the material 10 of the packaging container, the risk of occurrence of the above-mentioned cracks effectively counteracts layer 25 used as an additional gatbering layer between the base layer 21 and the aluminum foil 24 in the packing material 20 according to the invention. The number or the thickness of the layer 25 in this embodiment is typically 10-30 g/m2.

Figure 3 schematically shows the packing material 30 according to a preferred variant implementation of the present invention. The packing material 30 includes a rigid, but bendable base layer 31 made of paper or paperboard and outer waterproof coating 32 and 33. Between the base layer 31 and one of the two exterior waterproof coatings 32 packing material 30 contains aluminum foil 34 that serves as a barrier to gases.

The packing material 30 according to this preferred variant differs from the packaging material 10 according to known technical is to the solution in figure 1, as the packaging material 20 in figure 2, mainly the fact that between the aluminum foil 34 and the base layer 31 is an extra layer 35 serving as a barrier to gases, to compensate for or counteract the cracks that may occur in the aluminum foil 34 during the formation of the packaging material 30 of the packaging container.

Preferred materials for additional or auxiliary gatbering layer 35 in the packing material 30 can be selected from the group, mainly comprising polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET films), copolymers of cyclic olefins (CES), polyamide (PA), amorphous polyamide (APA), liquid crystal polymers (ICP), copolymers of ethylene and vinyl alcohol (SAWS) and polyvinyl alcohol (PVA), which may not necessarily be applied to a thin substrate, such as paper.

Outer waterproof coating 33 may be made of plastic selected from the group, mainly comprising polyethylene (PE), polypropylene (PP) and complex polyester (PES), or a mixture thereof. Examples suitable for use polyethylene plastics can be high-density polyethylene (HDPE) or linear low density polyethylene (LLDPE), an example suitable for use polypropylene plastic may be oriented polyp is cut (OPP), as an example suitable for use closepreview plastic may be amorphous complex polyester (APAF).

Preferably moisture-proof coating 33 consists of physical or mechanical mixture of polypropylene (PP) and polyethylene (PE), which in addition to the excellent moisture resistance also has sufficient moisture and thermostatically to withstand the combined impact of moisture and heat that occur during normal heat treatment in an autoclave to ensure a long shelf life. In addition, the outer coating 33 of physical or mechanical mixture of polypropylene (PP) and polyethylene (PE) has excellent properties for printing and at the same time provides a mechanically strong and water-resistant seams when sealing in the process of formation of the packing material 33 thermoablative of the packaging container.

The thickness or quantity of external waterproof coating 33 may vary within wide limits, but is usually 25-45 g/m2.

Accordingly, water resistant outer coating 32 may consist of a plastic selected from the group, mainly comprising polyethylene (PE), polypropylene (PP), complex polyester (PES) and their copolymers. Examples suitable for use polyethylene plastic may be polyethylene of high PL is in the surrounding area (HDPE) or linear low density polyethylene (LLDPE), as an example suitable for use closepreview plastic may be amorphous complex polyester (APAF).

Preferably moisture-proof coating 32 from copolymers of propylene and ethylene has sufficient moisture and heat resistance to withstand the combined impact of moisture and heat that occur during normal heat treatment in an autoclave to ensure a long shelf life. In addition, the coating of a copolymer of propylene and ethylene provides a mechanically strong and water-resistant seams in the molding process of the packaging material 30 of the packaging container.

The thickness and the number of the outer cover 32 of the plastic may vary within wide limits, but is usually 25-35 g/m2.

As schematically shown in figure 3, the layer 35 is used as an additional gatbering layer, is connected with the base layer 31 at least one intermediate connection or adhesive layer 36. Appropriate choice of material in the intermediate coupling or adhesive layer 36, among others, will be achieved the advantage in comparison with the packaging material 20 in figure 2 that the number or the thickness of the layer 35 is used as an additional hashbarger, can be reduced without deterioration of the impermeability of the packaging material 30. When the apostrophes mentioned material layer 36 may be polypropylene (PP) or other olefinic polymer, with which the thickness of the additional gatbering layer 35 can be choose as little as 5-20 g/m2with ageing essentially of the same order as that of the packaging material 20 in figure 2, in which there is provided the use of an intermediate layer made of polypropylene or other olefinic polymer.

The packing material 30 according to a preferred variant implementation of the present invention, is shown in figure 3, is thus more economical, but as effective as the packing material 20 for thermoablative packaging container designed primarily for perishable and sensitive to the effects of oxygen products, such as food.

From the above description it is clear that the present invention by a simple modification of the known packaging material ensures the receipt of packaging material, which when bending and welding can be formed in thermoablative packaging container with sufficient gas impermeability, especially in relation to gaseous oxygen to provide reliable storage of perishable and sensitive to the effects of oxygen products, such as food.

Naturally, the present invention is not limited in its the volume presented and discussed as examples of variants of its implementation, but may include various changes and modifications without departing from the scope of the invention defined by the attached claims.

1. The packaging laminated material (30) for autoclavable packaging container comprising a rigid, but bendable base layer (31) made of paper or cardboard, exterior waterproof coating (32; 33), aluminum foil (34)that serves as a barrier to gases and located between the base layer (31) and one outer moisture-proof coating (32), and at least one additional layer (35)serving as a barrier to gases between the base layer (31) and aluminum foil (34), with the specified at least one additional layer (35) is attached to the underlying layer (31) by means of an intermediate or adhesive layer (36), characterized in that the said outer waterproof coating (32; 33) and the intermediate adhesive layer (36) is made of polypropylene (PP).

2. The packaging material according to claim 1, characterized in that the at least one additional gazoballonnyj layer (35) is made of a material selected from the group consisting of polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET films), copolymers of cyclic olefins (CES), polyamide (PA), amorphous polyamide (APA), liquid crystal polymers (ICP), copolymers of ethyl is on vinyl alcohol (EMU) and polyvinyl alcohol (PVA).

3. The packaging material according to claim 1, characterized in that the thickness of the specified at least one additional layer (35), which serves as a barrier to gases, is 5-20 g/m2.

4. The packaging material according to any one of claims 1 to 3, characterized in that the outer moisture-proof coating (33) has a thickness of 25-45 g/m2.

5. The packaging material according to any one of claims 1 to 3, characterized in that the outer moisture-proof coating (32) has a thickness of 25-35 g/m2.

6. The packaging container obtained by bending and TermoSanitari packaging laminated material (30) according to any preceding item.

7. The method of packaging of the product, providing the receiving container by flexing and TermoSanitari packaging laminated material that includes a rigid, but bendable base layer of paper or cardboard, exterior waterproof coating, aluminum foil serves as a barrier to gases and located between the base layer and one outer moisture-proof coating, and at least one additional layer that acts as a barrier to gases between the base layer and aluminum foil, with the specified at least one additional layer attached to the base by means of an intermediate layer or an adhesive layer, and the above outer lagonera azeemia cover and intermediate or the adhesive layer is made of polypropylene, filling the product and closing the container and the subsequent handling of the container in the autoclave to give a Packed content for long term storage in a closed packaging container.

8. The method according to claim 7, in which additional gazoballonnyj layer (35) is made of a material selected from the group consisting of polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET films), copolymers of cyclic olefins (CES), polyamide (PA), amorphous polyamide (APA), liquid crystal polymers (ICP), copolymers of ethylene and vinyl alcohol (EMU) and polyvinyl alcohol (PVA).

9. The method according to claim 7 or 8, in which the outer layer (33) on the side of the base layer (31), converted from a layer of aluminum foil (34), preferably made of oriented polypropylene.

10. The method according to claim 7 or 8, in which the outer layer (33) on the side of the base layer (31)carrying a layer of aluminum foil (34), preferably made of oriented polypropylene.

11. The method according to claim 7 or 8, in which the outer moisture-proof coating (33) has a thickness of 25-45 g/m2.

12. The method according to claim 7 or 8, in which the outer moisture-proof coating (32) has a thickness of 25-35 g/m2.



 

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