DE1786574B2 - Compressible container made from a multilayer material and process for its manufacture Separated from: 1486175 - Google Patents

Description

60

The invention relates to a compressible container with largely gas impermeable ger wall with a tubular container body, which has at least one impermeable barrier layer, at least on their surface facing the inside of the container with at least one layer of plastic is occupied and a head piece connected to the container body at one of its ends for the Removal of the filling material, as well as a method for the production of the same.

Compressible containers of those described above Art (DT-PS 858 772) are used to package filling goods that are volatile, for example Contains oils to prevent these volatile constituents from escaping through the container wall Such a volatilization, which is quite detrimental to the quality of the product, would in fact be possible, if a commercially available plastic container was used without a special barrier view.

Further through the container is considered here The ingress of gases such as atmospheric oxygen or the like through the container wall can also be avoided, in order to protect the contents from a disadvantageous change under the influence of such gases. With the mentioned Plastic containers without blocking view is known to be possible that such a penetration the container wall occurs, whereby the filling material also undergoes an undesirable change, such as oxidation, can suffer.

The container mentioned at the beginning with a barrier layer made of impermeable film material in the container wall, on the other hand, provides an effective Protection of the product against the undesirable effects of the penetration of gases or volatile substances through this wall; However, this protection is only in the area of the tubular with the Be holders Container body guaranteed. That is, while maintaining this container while maintaining the desired Advantages of plastic containers (in contrast to metal or paper containers, for example) the contents also od against the passage of gases. Like, through the wall of the actual container body ^ protect, they still have the disadvantage that they usually only consist of plastic Head piece are provided so that the gases or volatile substances mentioned are still, albeit to a limited extent, through part of the container wall, namely through the head piece wall can. As a result, said container does not yet protect the contents to a sufficient extent.

The object of the invention is therefore in particular a container of the described type that can be manufactured as easily as possible A-? to be designed in such a way that it practically prevents any gas penetration of the contents or substances flow through the container wall contactor ..

To this :, / neck is the container according to the invention designed such that the head piece also has at least one impermeable barrier layer which is covered by a plastic layer at least on its inner surface facing towards the inside of the container is.

The provision of an impermeable barrier layer in the head piece is also already known (CH-PS 245 861). However, this is used in conjunction with a tube that is not made of a continuous smooth tube there is tubular jacket, but rather whose jacket is drawn in in the area of the head piece This makes the production difficult, since when using flat films for the production of the jacket in the Foldings must be provided in the area of the head piece, which means there is a risk of these foils tearing at the kinks and also lead to an unsightly appearance of the tube.

According to a preferred development, the for

The edge of the barrier layer of the head piece pointing towards the tubular body at a short distance from it arranged adjacent edge of the barrier layer of the tubular body and the head piece with the tubular body welded by means of the plastic contained in each case It is already known that on egg.ien multilayer Coat of tubes with the outer layer consists of plastic to weld on a head piece made of plastic that is not provided with a barrier layer (DT-Gbm 1 781 765). Because of the different material thicknesses, there is no perfect one Connection ensured.

Thanks to these features, the Behälu.1 according to the invention prevents any passage of gases or the like. practically completely prevented by whatever part of the container wall. Furthermore, by the invention Design of the container prevents the barrier layer of the head piece, which for example can consist of a metal foil material, comes into contact with the filling material, since the inner surface this header barrier layer with a plastic layer is occupied. There is direct contact between the filling material and, in particular, the metallic barrier layer undesirable, as many of the substances forming the filling material react with the metal of the barrier layer and thus in could spoil to a greater or lesser extent.

The method for producing the container described above is based on one Method (PT-PS 858 772) in which the end to be provided with the head piece of at least one, at least one tubular container body having a barrier layer connected to the inside with a plastic layer introduced into a two-part head piece mold and thermoplastic material injected onto it will. According to the invention, a barrier layer is then applied prior to injection into the head piece mold The forming part is introduced in such a way that it faces at least the inside of the container when spraying Area is covered with the thermoplastic material or connected.

Exemplary embodiments according to the invention are described with reference to the drawing. It shows

F 1 g. 1 is a side view of a compressible Container according to the invention, wherein parts of the body walls to explain the layered body structure have broken away

F i g. 2 shows a section through the head piece of the container (Detailed representation; greatly enlarged scale),

F i g. 3 shows a plan view of the in FIG. I shown container, of which a piece to explain the The connection between the layer arrangement in the head piece and the pipe body has broken away,

F i g. 4 shows a three-dimensional representation of a laminated body disk for use in the head piece according to FIG. 2 and

F i g. 5 and 6 sections through the mold showing the two process steps for forming the head piece demonstrate.

In Fig. 1 is a container designed according to the invention generally designated by the reference character (! 'and includes a collapsible tubular Body 10, which is closed off at one end by heat sealing or some other technical process at It is. The tubular body carries a plastic head piece 12 at its opposite end with neck part 13 and chest part 14, which latter is fused with the tubular body.

The tubular body 10 according to the selected embodiment comprises three layers which are connected to one another are rolled or otherwise connected. In the embodiment shown, the compressible Body an outer layer 15, possibly made of a thermoplastic material such as polyolefin should be formed, even if paper can also be used in certain cases. The outer Layer 15 can have the same composition as the inner layer 17 on the opposite Surface of the intermediate layer 16 is rolled on.

The intermediate layer 16, which is the protective cover against oxygen absorption from the atmosphere and the Forming the passage of essential oil outward through the tubular body is preferably a metal foil.

The head piece 12 can be injection molded in a single operation and with the Tubular body 10 are fused, in particular for an overlap between the lower end of the header 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 mi. Metallic liner of the required Diameter and the corresponding thickness, which is then cut into the desired with punch and die Head shape is brought, expediently at the same time the shoulder-overlap connection is shaped. The tubular body can also be prefabricated with a barrier layer Head piece are welded, which preferably has a recess for receiving the abutting edge of the tubular body owns.

I i g. 2 shows the structure of the head piece 14 according to FIG. 1. This head piece is shown in FIGS. 2 to 6 with 212 designated.

A Schulzschild component is now in the chest part 214 230 embedded, extending from the lower end of the neck part 213 (Fig. 3) to a point at a slight distance from the peripheral edge portion 224 of the laminated body 210 extends. The protective shield component 230 is preferably formed by a metallic foil, for example Aluminum, and can be used in the thermoplastic material of the chest portion 214 during the casting process be embedded, albeit a laminated body washer in accordance with the tubular body 229 is preferred which has a metallic foil intermediate layer 230 and thermoplastic cover layers 231 and 232.

Like 1 1 g. 4 shows, composite washer 229 at 233 may have a center opening for a purpose of FIG is now clarified, be provided, it can have a short upwardly projecting collar part 234, from which a rim portion 235 extends outwardly and downwardly. The pane component 229 is prefabricated, and before the assembly and the laminated body formation from the metallic intermediate layer 230 and the thermoplastic outer layers 231 and 232 can be the metallic intermediate layer forming the protective shield 230, as shown at 230a, along lines provided around the perimeter for recording of the excess material in this area flanged or folded or otherwise deformed will. Of course, when applying the flanges or folds 230a, the foil disk 230 can be attached to suitable ones be slotted on the circumference at a distance from each other. The above The head piece is preferably used in the form shown in FIGS. 5

6 and 6 are shaped and attached to the tubular body. The annular disc member 229 or only its film part 230 is placed on the shoulder of a dome 260 of an injection molding device, with the disc component surrounds the neck portion 2606 of the dome all around. The tubular body 210 is then on placed the mandrel, the end 222 of the tubular body up to the stop on an inwardly bent Surface 261 of the inner surface of a hollow mold 262 protrudes. The curved surface 261 of the mold forms and bends inwardly end 222 of tubular body 210 as shown.

It must be ensured that the edge of the disc edge part 235 from the Edge edge 224 of the tubular body is kept at a distance when the laminated body 210 and the washer 229 on sit on the mandrel 216. This provides a casting path for the heated thermoplastic material during the Injection process, thereby ensuring that there is a solid fusion between the headpiece material and the upper end of the inner thermoplastic layer 217 of the tubular body, which is obtained in the completed tube results in a strong laminate connection, designated 218, which defines the distance between opposite marginal edges of the laminates 210 and 229 bridged. If the parts in the in F i g. 5 are arranged, the heated thermoplastic material is in the between The cavity formed in the mandrel 260 and the mold 262 is introduced, which at the applied pressure leads to the fact that the disc component 229 is lifted from the shoulder ter of the dome, so that during the Formation of the head piece 212 and its fusion with the thermoplastic layers 215 and 217 of the tubular body, the disk component is essentially in the middle of the layer thickness of the breast part 214 forming thermoplastic material is held.

This method not only results in a very resistant to breakage connection 223 between the Head material and the thermoplastic layer 217 of the tubular body, but also a protective shield containing chest part 214, which completes the composite tube 210, since it is penetrating of the product to the outside and counteracts oxygen absorption. The outer edge 224 of the after In this example tubular body 210, which is slightly bent at the end, is neatly embedded in the cast head part, which can bring additional advantages for the behavior or the service life of the finished container.

The head piece 212 can be formed by equivalent methods and fastened to the tubular body 210 in a sealing manner are, for example by die casting, simultaneously with the attachment to the pipe body or thereby, that the head piece is shaped in a special operation and then by a heat seal or Heat seal is united with the tubular body. At present, however, the one shown in FIG. 2 is preferred. The fusible link exhibits great resistance to breakage or separation by either axial, radial or torsional forces, and in this context it should be noted that the Resin composite polymer that forms the inner layer 217 of the pipe body 20 blends well with another area of polyofines and also has a high resistance to delamination and buckling having.

For this purpose 3 sheets of drawings

Claims (5)

Patent claims: 1. Collapsible container with largely gas-impermeable wall with a tubular container body, the at least one impermeable Has blocking view, at least on its surface facing the inside of the container with at least one layer of plastic is covered and one with the container body on one of its Head piece connected to the ends for the removal of the filling material, characterized in that, that the head piece (12 or 212) also has at least one impermeable barrier layer (230), at least on their inner surface facing the inside of the container from a plastic layer is covered. 2. Container according to claim 1, characterized in that the / to tubular body indicative Edge of the barrier layer (230) of the head piece (12 or 212) at a short distance from it adjacent edge of the barrier layer (16 b / w. 216) of the tubular body (10 or 210) and the Head piece is welded to the tubular body by means of the plastic contained in each case. * 5 3. Container according to at least one of claims 1 and 2, in which the head piece is a centrally arranged and has an outwardly extending shark or bung base, characterized in that that the barrier layer of the head piece is an annular ring-shaped embedded in thermoplastic material Part (229) is. 4. Method / ur production of the container according to one of claims 1 to 3, in which the with the Head piece to be provided end of the at least one, at least on the inside with a plastic layer connected barrier layer having tubular container body into a two-part Head piece mold is introduced and thermoplastic material is injected thereon, characterized in that that a barrier forming part prior to injection into the header mold is introduced in such a way that it is at least facing the inside of the container during spraying Area is covered with the thermoplastic material or connected. 5. The method of claim 4, wherein the tubular body on an inner surface of the head piece forming shaped body and both together in a forming the outer surface of the head piece Casting mold is inserted, characterized in that the forming the barrier layer ring-shaped part is placed in the head piece mold that its pointing towards the tubular body Edge at a large radial distance from the end of the tubular body to be provided with the head piece is located.