DE1088411B - Process for the production of single- or double-walled containers made of plasticized thermoplastic material filled with liquid or paste - Google Patents

Description

Process for the production of liquid or paste-filled, single or double-walled containers made of plasticized thermoplastic material The invention relates to the production of liquid or paste-filled, single or double-walled containers made of plasticized thermoplastic material.

With such containers it is shown, especially when the filling material Contains water, alcohol or the like, the disadvantage that this through the container walls evaporate through. If the filling is a paste-like substance, it can Evaporation through the walls of the container go so far that in the container of the previously pasty substance only remains a solid residue.

In addition, experience has shown that when packing aqueous Colors or dyes in containers made of thermoplastic materials, the plasticizers contain, the paint penetrates into the walls of the container and against parts of the Plasticizer exchanges, so that the plasticizer partly from the thermoplastic The material is washed out and the container becomes colored and harder.

If thermoplastic materials with a high content of plasticizers, such as polyvinyl chloride, for packaging cosmetic, pharmaceutical materials or food is used in liquid, semi-liquid or pasty form, the plasticizer must be non-toxic and consist, for example, of dioctyl phthalate. But even if the plasticizer is non-toxic and completely harmless, it is It is important that the plasticizer does not get out of the container wall through the contents is washed out and passes into this, so that the container remains pliable and the character of the product, e.g. B. the taste of food is not affected will.

The invention strikes through its simplicity, economy and effectiveness excels in our method of manufacturing packaging containers of the specified type, due to the evaporation of liquids contained in the product through the container wall and the plasticizer passes over from the container wall is avoided or at least greatly reduced in the filling material.

In the case of packaging containers of all kinds, it is already in itself known to take measures and precautions to reduce the vapor permeability of the Avoid containers and thus the risk of evaporation of the container contents or should decrease. For this purpose, cardboard is provided for cardboard containers to soak with paraffin oil. However, this measure can be used for containers made of plasticized thermoplastic material does not perform because of this, if it is also a certain Has permeability to vapors or gases, but not such absorbency possesses that impregnation with t) l would be possible.

In addition, the impregnation would usually be done by immersion in hot 01 is not conducive to plastic containers and causes distortion To give reason.

According to another known proposal, cardboard containers should be used outside, mainly on the edges of the flaps, with paraffin wax, which solidifies to a solid coating, can be coated.

Such a coating would be used for the plastic containers in question, which, by the way, have no closing flaps, but are closed by edge welding are, on the one hand, deprive the containers of the necessary flexibility and on the other hand no protection against an exchange of the plasticizer contained in the plastic Share the contents of the container.

Another well-known proposal provides for the containers, including such Made of thermoplastic material, double-walled and in the space between a liquid which prevents or reduces the vapor permeability on the walls bring in.

However, such a method is not suitable for inexpensive mass production and, moreover, there is no protection against the replacement of the plasticizer here either Inner wall given with parts of the container contents.

Finally, it is known for single- or double-walled containers the inside and / or the room between those forming the double wall To provide foils with a layer of varnish. But painting is cumbersome. the Layers of lacquer must be dried before the product is introduced, which is time-consuming and makes it more expensive, especially if it is a mass production acts. In addition, it can happen with lacquers that, especially if they are pressed together frequently The container flakes off paint particles for the purpose of emptying.

Compared to the known, the inventive method for Manufacture of single or double-walled containers filled with liquid or paste made of plasticized thermoplastic material essentially that before the introduction of the product onto the inner surface and in the case of double-walled containers, As is known per se, there is also a liquid and a liquid remaining between its walls oily substance is applied or introduced in a thin layer.

It has surprisingly been found that the thin oily layer when the product is introduced, it is not displaced by this, but on the inner wall remains adhering, and that they both an evaporation of the filling material through the container wall through as well as an overflow of plasticizer from the container wall into the container contents as well as penetration of particles of the latter into the wall in a satisfactory manner prevented. In addition, the oily layer makes it easier for the product to slide lengthways the inner wall when it is introduced into the container.

Highly purified paraffin oil is particularly suitable for the oil pull proved suitable. It is essential that the oil coating is kept so thin that that it does not mix with the contents, and that its quantity is so small that he cannot go into an exchange with the plasticizer himself.

While purified liquid paraffin is due to its odor and Tastelessness is particularly suitable for the oil coating, of course, can other oily substances are used, their selection according to the type of packaging Content takes place.

The containers can be made from an extrusion-molded tube or made from sheets or strips of plasticized thermoplastic material will.

The method according to the invention, which, as mentioned, both can be used advantageously in the manufacture of single-walled and double-walled containers, is particularly suitable for the mass production of single-walled containers, which are due to the simplicity of applying the oily inner coating is much cheaper can be produced than that according to the known method with protection against vapor permeability provided container.

Some exemplary implementations of the method are described in accordance with FIG Invention and containers made according to this with reference to the drawings explained in more detail.

Fig. 1 shows an extruded seamless Polyvinyl chloride hose 1 with a thin oil coating on its inner surface 2 has.

According to FIG. 2, a second tube is in an outer tube slightly smaller diameter inserted. 1 is the inner tube, la is the outer Hose, 2 der.Olüberzug on the inner surface of the double hose and 2a between oil layer provided on both walls.

Figure 3 shows two sheets and lb of polyvinyl chloride from which the containers are to be manufactured. These tracks are previously on the surfaces, Which come to lie inside, provided with a Ülüberzug 2 or 2 b. The railways will as known per se, formed by edge welding to form containers.

According to FIG. 4, double-walled containers made of four layers are to be thermoplastic Materials 1, 1 b and 1 c, id are made. Between lanes 1 and 1 c is an oily layer 2c and between webs 1b and 1 (1 an oily layer 2 (1 appropriate. In addition, on the inside of the webs 1 and 1 b, as in Fig. 3, oil coatings 2 and 2 b provided. The four lanes become double-walled Container manufactured by edge welding as known.

Fig. 5 shows part of a thermoplastic hose 4, the can be of considerable length and contain a small amount of an oily substance 3 has been introduced. The hose is inserted into a pair of pressure rollers 5 and 6, under compression of the hose this in the direction of the drawn Move the arrow while continuously displacing the oily substance backwards, this in the emerging from the pressure rollers part 7 on the inside Leave a thin film of oil. In Fig. 6 is a finished filled single-walled Container shown in perspective with a portion broken away around the wall and show the contents of the container.

The container is made from a tube made of polyvinyl chloride been. The tube pieces forming the container are welded at the ends. 1 is the container, 2 is the inner oil coating, 3 a is the container contents and 4a, 4 b are the terminations made by welding.

Fig. 7 shows a section through part of a container which differs from that of FIG. 6 in that it is double-walled. Between the two walls 1 and pa is an oil layer 2 and also the inside of the hose is provided with an Ö1 coating 2 «. The contents of the container are marked with 3e and one of the Terminations produced by welding are denoted by 4a.

Fig. 8 shows a known device for producing filled Container made from a tube made of plasticized thermoplastic material. Of the Hose 1 provided on the inside with the oil coating 2 is filled with liquid or paste 3 filled. The tube filled in this way comes between two workpieces 8 and 8 a, which sit on pressed parts 9 and 10, respectively. The tools are attached to a high frequency generator 11 connected, namely the tool 8 ″ through the line 12 and the tool 8 through line 13. In line 12 there is a switch 14. Upon entry of the filled hose between the tools, the switch 14 is open. After this the tools 8 and 8a, which form electrodes, exert pressure on the hose have so that the walls touch each other, the switch 14 is closed and the Electrodes are used to weld the touching walls of the hose required heat.

The application of the oil coating on the inside and the introduction the filling material can be done in one operation if necessary. This way of working is especially appropriate when the container is made from a hose which has a length suitable for a number of individual containers. Of the The process is as follows: In one of the ends of the thermoplastic tube a lot of oily substance is introduced. This end is then attached to a fixture connected, from which the filling material by its own gravity or under Pressure is introduced into the hose. The hose is at such an angle held up to the horizontal that the product entering the hose the oily substance continuously pushes in front of it, with it on the inner surface the hose leaves a coating of oil during filling. The excess on Oil comes out of the other end of the hose.

For the formation of the oil coating, it is advisable to add a little to the oil heat, but not so much that the heat causes distortion of the thermoplastic Can enter the container.

In those cases where powdery or granular substances are present in the Contents are contained, prevents the oil coating that the contents on the walls remains sticking during the pressing process and so does the welding and sealing of the walls prevented by heat. When the pressure is exerted, the oil coating causes powdery or granular particles are displaced from the pressing point.

PATENT CLAIM: 1. Method of making with liquid or paste-filled, single or double-walled containers made of plasticized thermoplastic Material with the use of a liquid barrier layer to reduce vapor permeability of the container, characterized in that prior to the introduction of the filling material on the inner surface and in the case of double-walled containers. as known per se, also between the walls of which are a thin layer of a liquid and liquid oily substance is applied or introduced.

Claims (1)

2. The method according to claim 1, characterized in that for generating the oil layer in a larger one intended for the production of smaller packs Container, a lot of an oily substance in the filling space and double-walled Containers, as is known, is also introduced into the space between the walls and the walls of the container are pressed against each other so that with displacement of the excess oil to the outside on the walls that come into contact with the oil Oil layer remains. 3. The method according to claim 2, using a single or double-walled Hose for the production of a number of packs, characterized in, that a lot of the oily substance in one end of the interior and between the outer and inner wall of the hose inserted and the hose with this end is passed forward between a pair of pressure rollers, which the oily substance leaving a thin layer of oil on the hose walls backwards and the excess oil finally pushes out of the other end of the hose. 4. The method according to claim 1 for the production of single-walled containers from two superimposed film webs made of thermoplastic material, thereby characterized that two strips of these webs on each side with an oily Covered, laid with the oil-drawn sides on top of each other and then to form of containers are edge-welded in a known manner. 5. The method according to claims 1 and 4 for the production of double-walled Containers, characterized in that between four strips of thermoplastic Material oily layers are provided and these are then placed on top of one another and edge-welded will. 6. The method according to claim 1 using a simple hose for producing the packs, characterized in that after a Amount of the oily substance in one end of the hose in its filling space on the same The end of the product to be packaged is introduced under pressure, the filled Well the oil, leaving a thin layer of oil on the hose wall pushes. 7. A method for producing containers according to any one of the claims 1 to 7, characterized in that the oily substance is heated, but not with such a temperature is introduced into the container that thereby a distortion the container wall could be brought about. Publications considered: German Patent No. 595 610; French Patent No. 982,324; U.S. Patents No. 2,404,422, 2 412 031, 2 530 400.