DE1786574A1 - COMPRESSIBLE CONTAINER MADE OF A MULTI-LAYER MATERIAL - Google Patents

Description

Compressible container made from a multilayer material. The invention refers to a collapsible container with a largely gas impermeable Wall with a tubular container body, the at least one impermeable Has barrier layer, at least on its surface facing the inside of the container is covered with at least one layer of plastic and one with the container body at one of its ends connected head piece for the removal of the filling material, as well as to a method of making the same.

Collapsible containers of the type described above can be used Used for packaging filling goods that contain, for example, volatile lead to to avoid that these volatile constituents through the container wall escape. Such a volatilization, which is quite detrimental to the quality of the product would in fact be possible if a standard plastic container with no special Barrier would be used.

Furthermore, the container of the type considered here should also mean that Penetration of gases, such as atmospheric oxygen or the like. Avoided through the container wall be to the filling material 35-9071P-excretion-NöE from a disadvantageous To protect change under the influence of such gases. With the plastic containers mentioned Without a barrier layer, it is known that such a penetration of the container wall occurs, whereby the contents also show an undesirable change, such as oxidation, can suffer.

The container mentioned at the beginning with a barrier layer made of impermeable Foil material in the container wall, however, provides an effective protection of the Filling goods against the undesirable effects of the passage of gases or volatile Substances through this wall; However, this protection is only for the containers guaranteed in the area of the tubular container body. That is, while these containers while maintaining the desired advantage of the plastic containers (in contrast e.g. to metal or paper containers) the contents also prevent the passage of Gases or the like. protect by the wall of the actual container body, have they nevertheless have the disadvantage that they are usually only made of plastic existing head piece are provided so that the said gases or volatile substances nevertheless, albeit to a limited extent, through part of the container wall, namely can pass through the head piece wall. Consequently, the said protects The container is not yet filled with sufficient quantities.

The object of the present invention is therefore in particular to provide a to design containers of the type described, which are as easy to manufacture as possible, that it practically prevents any gas or volatile penetration of the contents Protects substances through the container wall.

For this purpose, the container according to the invention is designed in such a way that that the head piece also has at least one impermeable barrier layer, at least on their inner surface facing towards the inside of the container of one Plastic layer is covered.

Thanks to these features, the container according to the invention becomes anything Passage of gases or the like. Through whatever part of the container wall practically completely prevented. Furthermore, the inventive training of the container prevents the barrier layer of the head piece, which for example can consist of a metal foil material with which the product comes into contact, since the inner surface of this head piece barrier layer according to the invention is covered with a plastic layer is occupied. Direct contact between the product and, in particular, metallic contact Barrier layer is undesirable because many of the substances that form the filling material with the metal react to the barrier layer and thus spoil to a greater or lesser extent.

The inventive method for making the one described above Container, in which at least one at least one on its inside with a Tubular container body having a plastic layer bonded barrier layer is formed and provided at one end with a head piece, consists in particular in that the headed end of the tubular body is in a Kopfstckgießrorm is introduced and in the mold thermoplastic material as well as a barrier layer forming part are introduced, at least at its facing the container interior Area covered with the thermoplastic material or connected will.

The tight connection between the head and the tubular body requires that at least the inner layer of the pipe body can be welded to the head piece material. For example can polyethylene for the ft. can be used for the head piece and for the interior light a copolymer of ethylene and an ethylene iron unsaturated monocarboxylic acid such as acrylic or alkacrylic acid with one based on the weight of the copolymer Carboxylic acid content of 0.5 to 20% and a melt index of 1 to 50. Preferred is a mixed polymer with approx. 3% acrylic acid and a melt index of approx. 8. Such inner layers can be welded well with polyethylene and with themselves, Adhere well to metallic barrier layers without glue and are chemically sufficient inert.

In the following, the invention will be described in greater detail on the basis of exemplary embodiments described, from which further embodiments of the invention can be found. Reference is made to the attached drawings; They show: Fig. 1 a Side view of a collapsible container according to the invention, wherein for Explanation of the laminated body structure parts of the body walls are broken away; Fig. 2 shows a section through the head piece of the container (detail view; greatly enlarged Scale); Fig. 3 is a plan view of the container shown in Fig. 1, of which a section for explanation the connection between the layer arrangement has broken away in the head piece and the pipe body; Fig. 4 shows a three-dimensional representation a laminated body disk for use in the head piece according to FIGS. 2 and 5 and 6 cuts through the mold showing the two process steps to form of the head piece.

Referring now to Figure 1, a container constructed in accordance with the present invention is general denoted by the reference character C and comprises a collapsible tubular Body 10, which at one end by heat sealing or other technical Verrahren at 11 is complete. The tubular body carries on its opposite End of a plastic headpiece 12 with neck part 13 and chest section 14, which is the latter is fused to the tubular body.

The tubular body 10 according to the selected embodiment comprises three layers rolled together or otherwise connected are, albeit special applications, a reduction in the number of layers to two while other use cases may require four or to use more layers in the laminated body. In the embodiment shown comprises the compressible body an outer layer 15, the possible by a thermoplastic material, such as polyolefin is supposed to be formed, albeit paper can be used in certain cases. In this case, of course the rolling or the layer formation and the pipe forming process in a later to descriptive way appropriately modified. However, it is preferable the outer protective medium is a polyolefin, for example polyethylene.

It should be noted, however, that the outer layer 15 has the same composition as the inner layer 17 may have, which is on the opposite <e surface of the Interlayer 16 is rolled on.

The intermediate layer 16, which is the protective cover against oxygen absorption from the atmosphere and the passage of ethereal bls outward through the tubular body forms therethrough, is preferably a metal foil with one for the required Protective shell properties of sufficient thickness and is in the interest of flexibility and the manufacturing cost of the container is kept relatively thin. Aluminum foils have proven to be suitable, and the intermediate layer 16 can be printed or have decorative marks applied to their surface. The outer layer 15 is then transparent to keep the characters visible. Layer 15 protects thus these characters, and by the recording or printing on the intermediate layer is a treatment of the outer layer to create a receptivity for ink or color saved.

The inner layer 17 consists quite generally of a mixed polymer of an olefin, in particular of ethylene, with any structure and has a carboxylic acid content from 0.5 to 20 wt. Based on the weight of the copolymer. The melt index of the interpolymer is between 1 and 50.

The acid is expediently an ethylenically unsaturated monocarboxylic acid, such as acrylic acid or alkacrylic acid, of which the former is preferred in many cases will.

Particularly advantageous results are achieved when the inner layer 17 of the laminated body part 10 is a thermoplastic synthetic resin which is a copolymer is made from ethylene and acrylic acid with a random structure (random type) according to the known high-pressure process for the production of polyethylene with low Density has been obtained. This special interpolymer has a co-polymerized one Acrylic acid content in the order of 3 + 0.5 parts by weight, based on the weight of the mixed polymer, and a melt index of 8 + 1. Inner layers made of ethylene-acrylic acid copolymers show no visible signs of delamination from the (rolled) metallic Barrier layer 16 when exposed to commercially available fluoride-containing dentifrices.

A tubular container C according to FIG. 1 with an outer layer 15 made of polyethylene or the same copolymer as the inner layer 17 results in a high degree of hard bonding with the thermoplastic material in the mold 5 and 6 of the cast head piece 12.

The head piece 12 can be injection molded in a single operation be poured and fused to the tubular body 10, in particular for a Overlap between the lower end of the head piece and the upper end of the pipe body is taken care of. However, similar results can also be achieved by die casting or by punching out a body of thermoplastic material with metallic Interlayer of the required diameter and the corresponding thickness, which then is brought into the desired shape of the head with a punch and die, which is expedient at the same time the shoulder-overlap connection is shaped. Even the pipe body can be fitted with a prefabricated head piece with a barrier layer are welded, which is preferably a recess for receiving the abutting edge of the tubular body.

FIG. 2 shows the structure of the head piece 14 according to FIG. 1.

This head piece is designated by 212 in FIGS. 2 to 6.

A protective shield component 230 is now embedded in the chest part 214, which extends from the lower end of the neck part 213 (Fig. 3) to a point slightly Distance from the marginal edge part 224 of the laminated body 210 extends. The protective shield component 230 is preferably formed by a metallic foil, for example aluminum, and can in the thermoplastic material of the chest portion 214 during the molding process are embedded, albeit a laminated body disk in accordance with the tubular body 229 is preferred which has a metallic foil intermediate layer 230 and thermoplastic Has cover layers 231 and 232.

As FIG. 4 shows, the laminated body disk 229th at 233 can also be used be provided with a center opening for a purpose now clarified, it may have a short upwardly projecting collar portion 234 from which a rim portion 235 extends outwardly and downwardly. The pane component 229 is prefabricated, and prior to joining and laminating the intermediate metallic layer 230 and the thermoplastic outer layers 231 and 232 can form the protective shield forming intermediate metallic layer 230 as shown at 230a along the circumference spaced lines to accommodate the excess Materials be crimped or folded or otherwise deformed in this area. Of course, when applying the flanges or folds 250a, the foil disk 230 slotted at suitable points provided at a distance from one another on the circumference will. The above-described head piece is preferably used in FIGS 6 shaped manner shown and attached to the tubular body.

The annular disk component 229 or just its film part 230 is placed on the shoulder of a mandrel 260 of an injection molding machine, wherein the disc component all around the neck portion 260b of the mandrel. The tubular body 210 is then placed on the mandrel with the end 222 of the tubular body up to Stop against an inwardly curved surface 261 of the inner surface of a hollow Mold 262 protrudes. The curved surface 261 of the mold forms and bends the end 222 of the tubular body 210, as shown, inward.

Above all, care must be taken to ensure that the edge of the Disk edge part 255 held at a distance from the edge edge 224 of the tubular body is when laminate 210 and disc 229 are seated on mandrel 216. this results in a casting path for the heated thermoplastic material during the injection process, thereby ensuring that there is a tight fusion between the header material and the upper end of the inner thermoplastic layer 217 of the tubular body, what in the finished tube is a sharp composite compound designated by 218 results, which is the distance between opposite marginal edges of the laminated body 210 and 229 bridged. When the parts are arranged in the manner shown in FIG are, the heated thermoplastic material is in the between the mandrel 260 and the mold 262 is formed Cavity introduced what was used in the case of the applied Pressure causes the disc member 229 to be lifted off the shoulder of the mandrel is, so that during the formation of the head piece 212 and its fusion with the thermoplastic layers 215 and 217 of the tubular body of the shear member substantially in the middle of the layer thickness of the thormoplastic forming the chest part 214 Material is held. This procedure not only results in a great deal against breakage resistant connection 223 between the head material and the thermoplastic Layer 217 of the tubular body, but also one containing a protective shield Chest part 214, which completes the composite tube 210 as it is penetrating of the product to the outside and counteracts oxygen absorption. The outer Edge 224 of the tubular body 210 bent over at the end 1 according to this example neatly embedded in the cast headboard, which provides additional benefits for the Behavior or the life of the finished container can bring.

The header 212 can be formed and formed by equivalent methods be sealingly attached to the tubular body 210, for example by die casting, at the same time by attaching it to the pipe body or by having the head piece in a special Formed operation and then with a heat seal or heat seal the tubular body is united. At present, however, the connection shown in FIG preferred. The fusible link has a great resistance to breakage or Severing by either axial, radial or torsional forces on, and in this It should be noted that the synthetic resin copolymer that makes up the inner layer 217 of the tubular body 20 forms well with a wide area of polyolefins and also has a high resistance to delamination and has buckling stress.

As made clear by the above description, at a collapsible container according to the invention avoided the problems that could not be solved with the known tubes.

The invention also includes those embodiments in which the thermoplastic material used for casting or molding the headboard is the same Composition as the material used for the inner layer of the pipe body and the same material can be used for layers 231 and 232 of the laminated disk insert 229 can be provided when a head part 212 according to FIG. 2 is used.

Claims (5)

Claims 1. Compressible container with largely gas-impermeable Wall with a tubular container body, the at least one impermeable Has barrier layer, at least on its surface facing the inside of the container is covered with at least one layer of plastic and one with the container body at one of its ends connected head piece for the removal of the filling material, d a it is indicated that the head piece (12 or 212) is also has at least one impermeable barrier layer (230) at least at its after the inside of the container facing inner surface covered by a plastic layer is. 2. Container according to claim 1, characterized in that the tubular body indicative edge of the barrier layer (230) of the head piece (12 or 212) in a small Distance from the adjacent edge of the barrier layer (16 or 216) of the tubular body (10 or 210) arranged and the head piece with the tubular body by means of each contained plastic is welded. 3. Container according to at least one of claims 1 and 2, in which the Head piece has a centrally arranged and outwardly extending neck or neck. Has bung, characterized in that the barrier layer of the head piece is an annular part (229) embedded in thermoplastic material. 4. A method for manufacturing the container according to one of the Expectations 1-3, in which at least one at least one on its inside with a plastic layer connected barrier layer having tubular container body formed and on one end is provided with a head piece, characterized in that the with End of the tubular body provided with a head piece is inserted into a head piece casting mold and in the mold thermoplastic material and a barrier layer Part are introduced, at least on its facing the container interior Area is covered with the thermoplastic material or connected. 5. The method according to claim 4, characterized in that the tubular body is pushed onto a molded body, which at one end has an inner surface of the Head piece defining convex end surface has; that then on the convex mold body end surface a ring-shaped part of film material forming the barrier layer is placed on top, which is dimensioned such that its edge pointing to the tubular body in one small radial distance from the adjacent end face of the tubular body is located; on what the end portion of the molded body having the convex surface into an outer surface of the Koy -stückes defining casting mold introduced and thus created Mold space of the plastic forming the head piece. introduced in the molten state will.