Dispensing – Collapsible wall-type container – Nonmetallic
Patent
1991-11-25
1994-03-08
Kashnikow, Andres
Dispensing
Collapsible wall-type container
Nonmetallic
264259, 264263, 264279, B29D 2320, B29C 4318, B65D 3510, B65D 3512
Patent
active
052920348
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a method for the production of a tube made of a pipe element having at least one plastic layer and a multi-layer tube head molded by pressing of heated plastic blanks, with a tube neck opening out centrally in a dispensing opening, and with an outside thread to screw on a closure cap.
2. The Prior Art
Such a method and such a tube are known from EP-A-59281. The tube is produced in that two plastic blanks are issued above one another from two nozzle openings arranged above one another, and jointly brought to a press mold. The press mold consists of a mandrel, the free end of which reproduces the inside shape of the tube head, onto which a pre-finished pipe element is placed, and a die which reproduces the outside shape of the tube head. By applying pressure, the blanks are pressed to produce a layered tube head, which is simultaneously bonded to the pipe element. It is true that two layers can be obtained in this way, but they do not have a uniform arrangement, since even with slight variations in the viscosity or the temperature of the blanks, different flow velocities occur, which result in different distribution of the two blanks in the press mold. Therefore only tubes with two layers in the tube head can be produced. However, there is also a need to produce a tube with three layers, for example, one of which is supposed to be a barrier layer. Plastics with a barrier effect are usually difficult to combine with other plastics, and/or are not allowed to come into contact with the contents of the tube, so that additional covering layers are required as covering and/or insulating layers.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method of the type stated initially, which allows the production of multi-layer tube heads, particularly including more than two layers, with a defined structure of the individual layers, in simple manner.
It is also an object of the invention to provide a tube of the type stated initially, the tube head of which demonstrates layers with a desired reproducible shape, where each tube head can also consist of more than two layers and of different material in each case, including a barrier material. These objects are achieved by the method according to the invention; and by the tube according to the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following, the invention will be described on the basis of an embodiment of a tube, with reference to a drawing which shows a cross-section through half a tube head with the adjacent pipe element.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The tube has a pipe element 1, which consists of two plastic layers connected with one another, for example of a polyethylene, in the embodiment. The pipe element 1 can consist of two hoses extruded into one another, for example. It can also be produced from a film material which is welded together along the longitudinal edges. The pipe element can also have a different structure, for example only one layer or more than two layers, one of which can also be a barrier layer of plastic, or, for example, also of aluminum.
The tube head 2 has three layers in the embodiment, and has an inside layer 3 directed towards the inside of the tube, the outside surface of which limits the interior 4 of the tube, an outside layer 5, the surface of which determines the outside shape of the tube head 2, as well as a middle layer 6 arranged between them. All three layers together form a conical base part 7 of the tube head 2 and a cylindrical neck part 8, and the cover 8' in which a centrally arranged dispensing opening 9 is contained. The dispensing opening 9 can also correspond to the inside diameter of the neck part 8 (not shown).
In the embodiment, the middle layer 6 is retracted slightly relative to the inside layer 3 and somewhat more relative to the outside layer 5 in the cover 8', so that in this area, the inside layer 3 is directly connected with the outside layer 5, and the middle layer 6 is
REFERENCES:
patent: 3465917 (1969-09-01), Saeki
patent: 4132331 (1979-01-01), Magerle
patent: 4338278 (1982-07-01), Schultz
patent: 4548338 (1985-10-01), Sander
patent: 4568001 (1986-02-01), Sander
patent: 4784920 (1988-11-01), Machida
Patent Abstracts of Japan, vol. 4, No. 88, Document No. 55-46949, Apr. 1980.
AISA Automation Industrielle SA
Kashnikow Andres
Pomrening Anthoula
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