WO1995014571A1

WO1995014571A1 - Laminar material for the fabrication of packages and containers for alcoholic beverages

Info

Publication number: WO1995014571A1
Application number: PCT/ES1994/000124
Authority: WO
Inventors: José María MARTI CORBELLA; Juan Botella Atienza
Original assignee: Marti Corbella Jose Maria; Juan Botella Atienza
Priority date: 1993-11-24
Filing date: 1994-11-23
Publication date: 1995-06-01
Also published as: AU8145394A; ES2100786A1; ES2100786B1

Abstract

The laminar material comprises a plurality of juxtaposed layers (2, 3, 4, 6) of various materials. It is characterized in that it comprises a support material layer (3) which is covered on one face, said face being in contact with the corresponding alcoholic beverages (8) after the container (7) has been formed, with a layer of synthetic resin (2) of unsaturated and modified polymerized ionomers which form a barrier to volatile products, and on the other face, forming the external part of the container (7), with a layer of material (4) susceptible of being printed (5). The synthetic resin (2) of ionomers is metallized by application of a high vacuum technique, by high pressure injection of aluminium microparticules. This process provides for the fabrication of various packages and containers appropriate to be in contact with alcoholic beverages.

Description

L 'INAR MATERIAL FOR THE MANUFACTURE OF CONTAINERS AND CONTAINERS FOR ALCOHOLIC BEVERAGES.

The present invention relates to a sheet material for the manufacture of containers and containers for alcoholic beverages.

Said material allows the elaboration of closed containers and containers, generally formed from flat faces, forming figures such as tetrahedra, parallelepipeds, hexagons, prisms, prismoids, etc.

BACKGROUND OF THE INVENTION

In the field of the food industry, one of the activities that has presented a revolution in its principles, has been the food products packaging industry. The multiple manipulations of food and food products have led to the emergence of new formats, systems, elements and materials for the packaging and packaging of food products.

An important quantity of food products are presented in liquid, semi-liquid or fluid forms, in general, which increases the demand of the sector of containers and containers for liquid or similar products.

Initially, the glass, crystal, et. , in the form of bottles and the like. Said containers present known drawbacks due on the one hand to the fragility of the glass itself that could cause unwanted ruptures, on the other hand the possibility of alteration of the organoleptic characteristics of the product due to external influences such as solar radiation , extreme temperature differences, etc. , and finally the additional cost of handling and manufacturing the packaging, which had an impact About the cost of the final product.

As a result of these inconveniences, the manufacturing industry of liquid food products was determined by the use of glass and / or glass substitutes, such as cardboard, plastic materials, etc. for the constitution of the containers.

Among the plastic materials commonly used in the preparation of food packaging materials, the following may be mentioned, among others: - low density polyethylene (LDPE)

- high density polyethylene (HDPE)

- polypropylene (PP)

- rigid vinyl polychloride (PVC)

- polystyrene (PS) - styrene-acrylonitrile copolymers (SAN)

- polyethylene terephthalate (PETP)

- polyamides (PA)

Another evolution was presented with the design, size and dimensions of the package, proceeding to the development of containers in tetrahedral forms, widely used today to contain products such as milk, dairy products, water, juices and fruit extracts, etc. .

Among the abundant literature on the use and application of new materials and new containers that can remain in contact with food and food products, the following bibliographical references are worth mentioning:

- L.I. Nass, Encyclopedia of P.V.C. , (1,977)

- L.J Casarett, Toxicol. : Basic Sci. Poisons. , (1,975).

- BIT Project CEA 459 A 50506, P.V.C. for Food Contact Application. A Code of P.V.C. for safety in use. , Japan, (1,973)

- C. Jirkal et al. , Plastiques Modernes et Elas-totemmer. , 21, (1,969) - ANSI / ASTM D-2124-70, Additives in PVC Analysis. , (1,970)

- Legislation of the CC.EE .; Council Directives 76/893 / EEC of November 23, 82/711 / EEC of October 18; Commission Directives 80/590 / EEC of June 9, 90/128 / EEC of February 23, which establish: Materials and packaging intended to come into contact with food, conditions and tests, positive lists

10 of monomers and starting substances, maximum allowable migrations, etc.

- Royal Decree 211/92 of March 6, 1992 and Royal Decree 1769/93 of October 8, 1993 amending it, approving the list of

15 substances allowed for the manufacture of materials and plastic objects intended to come into contact with food and certain test conditions are regulated.

- ES-A-2016156, Shiin-Etsu Chemical Co., Ltd.,

20 Vinyl chloride resin compositions for food containers and food packaging materials.

- ES-A-8605189, Bioplast, S.A., Procedure for coating plastic containers with a pro¬

25 copolymerization of the vinylidene chloride with other mormers.

- EP-A-0293252, International Paper Co., New 2-protective polycarbonate flavorings / /, - blunt for cardboard packaging, and a procedure ¬

30 to obtain such laminates.

- EP-A-0353496. Tetra Laval Holding & Finance, S .A. , A flexible packaging material in the form of a weft or sheet.

EP-A-0230114, American Nat. CAN Co. Baxter

35 Intern. Inc. (A. Delaware Corporation), Pe1 icu- the multilayer polymers, containers and containers made with them.

According to said bibliography, the elements that contact with food comprise a base element, usually corrugated material of the cardboard type or the like, coated, on its face of contact with the food, of a film, sheet or coating material Suitable for being in contact with food.

Said contact material may be, among others, vinyl polychloride (PVC), suitable for packaging products such as milk and liquid dairy derivatives, juices and liquid fruit extracts, and other food liquids.

The adoption of these coatings, applied to alcoholic beverages in general, has shown certain drawbacks, given the physical-chemical characteristics of the liquid product.

It is well known that alcoholic beverages have a greater attack on polymeric materials, than the attacks produced by other food liquids, forcing realizations that present or a greater thickness in their coating film or realizations. that entail a high degree of barrier of the volatiles present in said alcoholic beverages. Alcoholic beverages in general also present a greater attack on the coating layer, increasing the migration of the material, reaching values higher than the limits allowed for said migrations. In addition, the attack of said alcoholic beverages on the lining can pass through the layer of the same, being able to present an attack on the outer material and even by adsorption with the material, normally corrugated or with the presence of air volumes, flowing towards outside, with loss of the content of product

Another drawback that can esentarse p ^r is the possible alteration of organolép¬ character- istics of the product, due to the migration of the coating layer and optionally the outer layer.

DESCRIPTION OF THE INVENTION

To solve, among others, the drawbacks described above, the sheet material for the manufacture of containers and containers for alcoholic beverages has been devised.

The sheet material comprises a plurality of juxtaposed layers of different materials. It is characterized in that it comprises at least one pa of material ie support, suitable for forming containers, whose support material is coated on one of its faces, face that once formed the container will be in contact with the corresponding alcoholic beverages, by a layer of a synthetic resin of unsaturated and modified polymerized ionomers "<ue have a high barrier to volatile products, and on the face, face that once formed the container will form the outside of the container, by a layer of material capable of being printed. such sheet material pres ^t ed caracte¬ teristics of a suitable manipulation for coi <rm containers at the same time as the package thus obtained has a barrier effect do eleva¬ migration products enva¬ SADOS, preserving the characteristics organoleptic of them.

The synthetic resin of polymerized unsaturated and modified ionóip -os for terrestrial applications, which has high barrier properties to volatile products, is metallized by the use of high vacuum technique, by injection at high pressure aluminum microparticles

Said metallic gives the layer greater protection against migrations and / or attacks of the product contained inside the shaped container. The bonding between the different juxtaposed layers is carried out by means of adhesives and conventional methods such as catalytic glues, two-component adhesives based on water or solvent and / or adhesive resins, although it is capable of applying other bonding techniques between sheet materials.

This allows to obtain a laminate with a homogeneous cohesion and characteristics suitable for subsequent manipulation.

Another embodiment of the sheet material is characterized in that the synthetic resin layer of polymerized unsaturated ionomers is presented in the form of a pellet and is extruded onto the layer of support material forming a previous layer suitable for joining with the material liable to be printed Said embodiment allows the high barrier resin to be manipulated and integrated into the support material regardless of its presentation in sheet or pellet.

Advantageously, the layer of support material is an aluminum sheet of thickness between 6 and 30 microns and preferably a thickness of 20 microns. This material is commonly used in this activity and has characteristics of handling and sufficient structure to form containers.

Another preferred embodiment is characterized in that the synthetic resin layer of polymerized unsaturated and modified ionomers for heat sealing applications has a thickness between 25 and 80 microns or a weight between 15 and 150 g per m ^z .

The different possibilities of thickness or weights are defined by technical and economic limitations. current mics, and the determined values have been proven adequate for all possible current applications.

As for the metallized aluminum of the synthetic resin layer, it has a thickness between 0.5 and 2 microns, which can be considered adequate to obtain the desired results.

Another embodiment of the sheet material is characterized in that the support material capable of being printed has a thickness between 12 and 100 microns. This allows to present a structure and stability to the differentiated container, according to the own needs for each type of container.

Interlayer bonding materials such as catalytic glues, solvent-based two-component adhesives or adhesive resins, according to another preferred embodiment, are added in amounts between 0.5 and 10 g per m ² , depending on the characteristics of the materials used for the layer and the characteristics of the joining materials.

According to the embodiment comprising the extrusion between the synthetic resin layer and the support material layer, the amount of material for extrusion is between 5 to 30 g per m ² , which makes it possible to obtain a layer of material suitable for joining with an external material that can be printed common in the production of packaging.

Another embodiment of the sheet material object of the invention is characterized in that the material capable of being printed is selected from among the synthetic resins of saturated polymerized esters or any other suitable material for printing.

These materials have been determined as suitable for, combined with the aforementioned, to present characteristics of stability, structure, presence and conservation, optimal for the packaging of liquids that have a high alcohol content.

Preferably and according to another embodiment of the sheet material, the union between the aluminum foil and the synthetic resins of saturated polymerized esters is carried out by extrusion.

This allows for another embodiment of the mate rial ^¬ sheet suitable for forming containers for alcoholic liquids.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of how much has been exposed, some drawings are attached in which, schematically and only by way of non-limiting example, a practical case of realizing the sheet material for the manufacture of containers and containers for alcoholic beverages is described, according to the object of the invention.

Figure 1 is a sectioned perspective view of the sheet material formed by the respective layers.

Figure 2 is a container formed from the sheet material of Figure 1

DESCRIPTION OF A PREFERRED EMBODIMENT

A concrete embodiment of the sheet material 1 for the manufacture of containers and containers for alcoholic beverages, comprising the following juxtaposed layers, can be seen in Figure 1:

Layer 2 of synthetic resins of unsaturated and modified polymerized ionomers that have a high barrier to volatile products. The thickness of said layer is 50 microns. - Aluminum sheet 3 of a thickness of 20 ml- ages .

- Layer 4 of synthetic resins of saturated polymerized esters, with a thickness of 25 microns. Said material allows printing 5 by conventional techniques, of commercial information about the product, its content, etc.

Between the different layers, is the adhesive 6 that determines the conformation and characteristics of stability and structure of the material. Said material has ideal characteristics for forming containers 7 ^and RSAS div forms. The conformation of said packages 7 from c laminar material 1, so that the layer 2 of synthetic resins of unsaturated poly-ionized ionomers establish contact with the liquid 8, obtaining a closed volume by means of a layer of high volatile barrier. The closure of the containers is done by conventional heat sealing techniques, or any other technique that guarantees proper closing conditions for the liquid to be contained. Table I lists, for indicative purposes, the technical characteristics determined by tests and tests, of the sheet material for two different embodiments, A and B. These embodiments differ in the thickness of the layers that make up the sheet material, said thicknesses being the following:

Material A Material B

Layer 2 50 microns 25 microns

Plate 3 20 microns 17 microns Layer 4 25 microns 12 microns TABLE I

Technical data Units Mater. To Mater. B

Nominal Weight g / m * 135 60

Yield m kg 7.4 16.6

Lax force adhesion g / cm 59.1 59, 1

Lin force welding Nw / 15 mm 15 15 longit. 175'C, 0.5 sec.

Lin force welding Nw / 15 mm 14 14 transv. 175 * C, 0.5 sec.

Lax retention solvents mg / πf 20 20

Peability steam g / m ² <0.25 <0.5 24 h / 38'C /? 0 l HR

Peccεability oxygen cc / πf <0.25 <0.5

Peπeability carbon dioxide cc / m ² <1.0 <1.5 24 h / 1 atι / 25'C / 75 í HR

Puncture resistance Nw / mm 10 9

Loss of flavor content% <5 <5 diluted in 30 days

Coefficient of friction 0.2 / 0.8 0, 2/0, 8

A specific embodiment of the invention has been described herein, by way of example, although the sheet material for the manufacture of containers and containers for alcoholic beverages object of the invention is susceptible to numerous modifications and variations , accessible to the person skilled in the art, which should be considered as falling within the scope of the inventive concept and the appended claims.

Claims

11R EIVINDICATIONS

1. Sheet material (1) for the manufacture of containers (7) and containers for alcoholic beverages, comprising a plurality of layers (2,3,4,6) juxtaposed with different materials, characterized by the fact that it comprises less a layer of support material (3), suitable for forming packages (7), whose support material (3) is coated on one of its faces, face that once formed the container (7) will be in contact with the corresponding alcoholic beverages (8), by a layer of a synthetic resin (2) of polymerized unsaturated and modified ionomers that have a high barrier to volatile products, and on the other side, face that once formed the container (7) will form the exterior of the container (7), for a layer of material (4) capable of being printed (5).

2. Material (1) according to the preceding claim, characterized in that the resin (2) synthesized from polymerized unsaturated and modified ionomers for heat-sealing applications, presenting high barrier properties to volatile products , it is metallized by using high vacuum technique, by high pressure injection of aluminum microparticles. 3. Material (1) according to the preceding claims, characterized in that the joint between the different juxtaposed layers (2,

3,4) it is carried out by adding catalytic glues, adhesive resins, two component adhesives in an aqueous base or in a solvent base (6).

4. Material (1) according to the preceding claims, characterized in that the synthetic resin layer (2) of unsaturated polymerized ionomers is in the form of a pellet and is extruded onto the support material layer ( 3) forming a previous layer It is suitable for joining with the material (4) that can be printed (5).

5. Material (1) according to the preceding claims, characterized in that the support material layer is an aluminum sheet (3) of thickness between 6 and 30 microns and preferably a thickness of 20 microns

6. Material (1) according to the preceding claims, characterized in that the synthetic resin layer (2) of polymerized unsaturated and modified ionomers for heat sealing applications has a thickness between 25 and 80 microns and / or a weight between 15 and 150 g per m ² .

7. Material (1) according to claim 6, characterized in that the aluminum metallization of the synthetic resin layer (2) has a thickness comprised between 0.5 and 2 microns.

8. Material (1) according to the preceding claims, characterized in that the material (4) capable of being printed (5) has a thickness between 12 and 100 microns.

9. Material (1) according to the preceding claims, characterized in that the catalytic glues, solvent-based two component adhesives or adhesive resins are added in amounts between 0.5 and 10 g per m ² .

10. Material (1) according to the preceding claims, characterized in that the amount of adhesive used in the extrusion of the synthetic resin layer (2) with the layer of support material (3) is between 5 to 30 g per m ² .

11. Material (1) according to the preceding claims, characterized in that the material (4) capable of being printed (5) is selected from among the synthetic resins of polymerized esters 13

saturated or cardboard.

12. Material (1) according to any one of the preceding claims, characterized in that the union between the aluminum foil and the synthetic resins of saturated polymerized esters is carried out by extrusion.