DK145288B - WASHING CONTAINER WITH INTERNAL PLASTIC AND STABLE COAT AND PROCEDURE FOR MANUFACTURING THE CONTAINER - Google Patents

Description

® (12) PUBLICATION NOW 145288B

(19) DENMARK

DIRECTORATE OF THE PATENT AND TRADEMARKET SYSTEM

(21) Application No. 4j525 / 77 (51) 1nt.CI.3 B 29 D 23/03 (22) Filing date 50 Sep. 1977 ® 65 D 1/02 (24) Race day 30. s ep. 1977 (41) Aim. available Apr 22 1978 (44) Posted Oct 25 1982 (86) International Application No. - (86) International Filing Day (85) Continuation Day _ (62) Stock Application No. _

(30) Priority 21. October 1976, 2647607, DE

(71) APPLYING SIMPLY COMMAKDITGESELLSCKS TO THE SHARE, Duese eldorf-Holth.au- een, DE.

(72) Inventor Alexander _Cioc, DE: Werner Kuenzel, DE: Klaus Meyer, DE.

(74) Clerk Eirmaet Chas. HucLe.

(54> Liquid container with Inner plate lining and stable jacket and a progressive «way of manufacturing the container.

The present invention relates to a packaging container for liquids and of the kind specified in the preamble of claim 1.

When containers of this kind are to be given an arbitrary shape, the sole DQ is designed as for example. If it is known from milk-filled bags, the wall thickness must be such that the container also exhibits in a filled state a C \ 1 specific outer shape, as well as mechanical stability. In this connection, the weight of the container material used and thus the plastic consumption is, among other things. depending on the weight of the product and the size of the container, the requirements that can be expected to be placed on the container on the road to consumption.

Qj ginger and of the user habits in handling. For the most part, containers are therefore used, the wall thickness of which is many times greater than would be necessary when it came to fluid density. Therefore, to reduce material consumption, attempts have already been made to produce mold-stable containers of compound materials.

In the manufacture of known packaging containers of the type mentioned in the introduction, the thermoplastic plastic is usually introduced into the molding tool in a plastic or approximately liquid state by heating. After the molding, a certain amount of time must be waited until - by usually extra cooling of the molding tools - the container is hardened so much that the molding tool can be opened and the finished container can be ejected. The performance of such a plant, e.g. a plastic blowing machine, depends crucially on how fast the cooling can take place. Therefore, it is used to cool the forming tools depending on the liquid carbon dioxide conditions or liquid nitrogen purchased. It is obvious that the stronger the required wall thickness of the container during manufacture must be cooled during manufacture. Thus, conventional mold-stable plastic containers require not only a significant consumption of valuable plastic material, but also a costly manufacturing process, especially with regard to molding the cooling of the tools in the manufacture of the containers.

It is an object of the present invention to provide a mold-stable packaging container and a method for its manufacture, whereby the cost of plastic material for use with the liquid-tight hollow body must be reduced so much that the plastic hollow body must now essentially only fulfill the actual purposes - namely, a liquid-tight packaging.

This object is fulfilled by the fact that the container mentioned according to the invention according to the invention is characterized by the characterizing part of claim 1.

Thus, the container of the present invention consists of one of individual segments, in particular of two half shells and the packaging mechanically stabilizing sheath and a liquid-tight but not self-supporting inner hollow body which forms a lining for the sheath and which, for liquid density, has just sufficient wall thickness and holding the segments of the sheath together by a tightly sealed material connection with their inner surfaces. In each shaping of the sheath or of the segments, a form-fitting connection is provided between the sheath and the inner cavity body. Thereby the segments can e.g. are mutually linked.

Thus, by means of the invention, firstly, the requirements for fluid density and stability are achieved, in principle, by means of one of two different joined layers of the wall, which are connected so that their materials end up close together and, where appropriate, also form-fitting ; The plastic liner provides fluid tightness, the shape stability jacket. However, since the sheath itself is made up of segmented segments, without the inner material-bonding and - binding plastic lining on its inner surface, like this - at least as a whole - would not be self-supporting.

Firstly, the connection with the materials close together leads to the packaging container, which in a certain way consists of two shells and consists of two wall layers which are not individually separate. bearing, and which in the joining of the present invention forms a simple mold-stable and bag-tight container.

It is commonly used for such containers, e.g. Bottles, used plastics can be used here with such a small thickness that in practice it now only has to carry out its actual task, namely sealing. Eg. in a container designed as the bottle according to the present invention, the plastic consumption can be reduced to less than one quarter compared to the case of the existing plastic-walled walls of the same shape stability. Mold stability is achieved here by means of a sheath which may consist of - usually preformed - inexpensive materials, such as e.g. cellulose, cardboard, cardboard, foamed plastics, glass fibers, or blend products thereof or in relation to the plastics of the inner cavity correspondingly cheap materials. Thus, by means of the present invention, a liquid-tight, stable packaging container with the least amount of precious plastic material, such as polyethylene or polyvinyl, is provided. The outer shape of the packaging container and its shape stability are provided by means of the generally prefabricated segments.

145288 4

The present invention also relates to a method of manufacturing the initially stable mold container, and it is hereby intended to reduce the cost of manufacture over the prior art.

This object is met by the fact that the method as set out in the preamble of claim 5 is peculiar to that of the characterizing part of claim 5.

By the method of the present invention, it is obtained that the container can be ejected out of the mold almost immediately after the inner cavity is formed in the casing sections adjacent to each other, because the mold stability is no longer determined by the heated plastic, must be cooled to achieve the desired strength, but by the already fixed body of the font embedded. In particular, the hitherto generally unconditioned cooling of the molding tools is no longer necessary. This not only increases the production of the machine, but also reduces the energy consumption. A crucial advantage of the method is that the tightly fitting connection between the materials and, where appropriate, the molding connection, between the molding and for a certain time thereafter, the plastic of the inner hollow body and the jacket is formed by itself without any extra work during the cooling of the plastic and hardening. Thus, the energy content of the plastic heated to be previously dispensed by cooling the mold is thus utilized by the present invention to produce the compound whereby the materials end up close together. Therefore, according to the present invention, it is sufficient when the materials for the preparation of the inner cavity and of the sheath are also selected so as to form between the inner walls of the sheath, and the segments, respectively, and the plastic material when formed prior to heating the inner cavity body. a sufficiently solid connection for the purposes of the container in question, in that the materials close together.

In the container of the present invention, or in the method of manufacturing the container, respectively, material accumulations or reductions may be provided at any of the segments so that the internal walls of the segments can be formed so as to obtain an optimum wall thickness for the segments. material embodied therein. In addition, e.g. reinforcement ribs are provided which cannot be seen from the outside of the container on the inner wall of the segments.

Also, the plastic inner cavity body may exhibit reinforced areas, e.g. a reinforced closure opening which (for example, by a bottle) may have a screw thread. The closing nozzle can protrude through a hole fitted into the casing, e.g. at the boundary between the adjacent segments. The manufacture of such reinforced plastic areas in the container presents no difficulties, since the machine can be programmed to deliver the plastic in a similar manner.

Further details are explained on the basis of the schematic drawing of exemplary embodiments. In the drawing, FIG. 1 to 3 are views from the outside and different sections through the packaging container and FIG. 4-6 different stages of manufacture.

A packaging container is shown in FIG. 1 is a longitudinal sectional view of FIG. 2 in cross section and in FIG. 3 from the outside. The container consists of a stiffening sheath 3 formed of individual segments 1 and 2 and a liquid-tight inner cavity body 4 which forms a lining for the sheath. Segments 1 and 2 abut each other in the separating plane 5 and the entire container, which in the illustrated example is shown as a bottle, is held together by the fixed connection between the surface of the inner cavity 4 and the side surface of the sheath 3.

In the embodiment shown in FIG. 1 and 3, the inner cavity body 4 has a reinforced closure opening 6 provided with a screw thread 7. Furthermore, at the bottom of the bottle shown in FIG. 1, reinforced portions 8 are formed on segments 1 and 2.

FIG. 4 and 5 also show schematic forming tools for making a container according to the present invention, the tools of FIG. 4 are shown separately and in FIG. 5 total. In FIG.

6 also schematically shows a cross section of the same forming tools in connection with a blow molding machine.

145288 6

FIG. 4 shows how the segments 1 and 2 of the sheath 3 of a container according to the present invention are loosely inserted into the mold parts or especially the halves. In the case of blow molding of the inner cavity body, during the closure of the mold parts, one coming from an extruder 11 via an inlet nozzle 12 is introduced, by heating at least plastic plastic hose 13 between the mold parts (Fig. 6). After the closure of the mold parts 10 (Fig. 5), the present part of the plastic hose 13 is inflated with compressed air so that it abuts on all sides against the segments 1 and 2 and the inner wall of the jacket 3, respectively.

In the previous method of blow molding of plastic containers, there is a cooling phase after blowing, which lasts until the molded container is hardened so that it can be ejected from the molding tools without being deformed. However, in the method of the present invention, the newly blown hollow body 4 has a sheath 3 which already has sufficient stability and has been joined with the thin-walled and therefore not self-supporting inner hollow body. Thus, the molding tools can be opened immediately after the inner cavity body 4 is formed therein and the container of the present invention can be molded out. The cooling of the plastic formed therein, which begins in the mold, and after the ejection continues, forms a connection where the materials close together and form an intimate molding connection between the inner cavity body 4 and the casing 3 of the segments 1 and 2 on such a This means that the container, which consists of the thin-walled, liquid-tight hollow body and the initially individual segments, becomes an effective shape-stable construction.

In addition to extrusion blowing, the inner cavity body of the present invention can also be produced by dipping blow spraying, spraying, etc. The segments forming the sheath can also be formed by known methods, e.g. pressing, spraying, deep drawing or casting. In many cases, it is advantageous when the segments of the sheath even before they are placed in the molding tools for the manufacture of the container - ie before they are connected to the inner cavity body - are provided with the decorations desired in each case.

Compared to known liquid containers of the kind mentioned above

Claims (2)

The following significant advantages are obtained: Without sacrificing mechanical stability, containers of the present invention can be made of a substantially smaller amount of plastic than previously used. Form stability is produced by other substances. In the choice of material for the stiffening jacket, the container according to the present invention can be made substantially more environmentally friendly than previously exclusively made of plastic containers. Also the waste disposal, e.g. in the household, becomes easier as this new container, when its mantle e.g. consists of cardboard or cardboard, which can be pressed together after emptying. In manufacturing, there are crucial advantages in that the molding tools do not need to be cooled separately. By gradually cooling in the ambient air, the purchase also improves the intimate material connection that is made between the sheath and its plastic lining. As cooling decreases, the performance of the forming machine can be increased. An important advantage is also that in the jacket, or in its segments, from the outside, visible stabilizing elements such as stiffening ribs can be incorporated. A further advantage lies in the fact that the weight of a container according to the present invention can easily be reduced less than that of a single layer of plastic made of known kind. Claims. 1. Packaging containers for liquids, such as detergents, dyes or chemicals with a liquid-tight plastic hollow body such as e.g. polyethylene or polyvinyl chloride, characterized in that an inner hollow body (4) having a wall thickness just sufficient to render it liquid-tight is connected form-fitting to the inner surface of a sheath (3), which consists of such material and has such dimensions that the eight itself ensures the stability of the container and further comprises at least two components.