DD140274A5 - METHOD AND DEVICE FOR ATTACHING A PIPE HOSE - Google Patents

Abstract

The invention relates to a method and a device for Attaching a complex, i. from two or more components composite protective cover for pipes, in particular sewerage " pipes and water pipes. While it is the object of the invention To provide pipes with a high envelope of use " The task consists in the wrapping in one single operation, carrying out the entire surface of the Tube can be intimately contacted with the envelope and also a second coating layer can be applied. As a solution is now provided that by appropriate means according to the method it is possible that of two or more arranged side by side Extruding a ribbon or strip of synthetic resin is extruded that the extruded strips fed simultaneously to a winding head be and helically in by means of a single winding head two or more concentric layers are wound around the pipe.

Description

Method and device for attaching a pipe casing

Field of application of the invention

The invention relates to a method and a device for attaching a complex, ie. Protective cover made of two or more components for pipes, in particular sewage pipes and water pipe ·

Characteristic of the known technical solutions

The known sheaths of this type consist of several parts Beatand, each for protection against chemical, electrical or mechanical influences. In many cases, the wrappings have hitherto been formed by a mixture in which the components of the mixture * suffer a loss of quality. This is especially true for polyethylene-based blends of medium or higher density; Such protective sheaths must be particularly protected against accelerating the aging process, which is based on the action of light, in particular ultraviolet light · It is therefore to the polyethylene coal dust which degrades some of the properties of the synthetic resin, in particular its adhesion and resistance.

Object of the invention:

The object of the invention is the provision of a method and of a device for applying a protective wrapper.

- 2 - Berlin, dU3.1979 AP ¥ 16L / 2O9 472

on pipes, which makes it possible to produce an envelope with higher utility value properties «

Explanation of the essence of the invention

The invention is based on the object, while maintaining the advantageous properties of the sheath forming substances, in particular the adhesion, to perform the sheath in a single operation, the entire surface of the pipe to be protected can be intimately contacted with the sheath, and also a second layer of the coating can be applied *

For this purpose, according to the invention, a method of extrusion of the envelope-forming substances is used, where ~ by means of a spinneret or an extruder head different substances of different qualities and colors are applied without a mixing of the various substances takes place, so that the qualities of these Substances are preserved «

So far, pipes to be laid in the ground with polyethylene or other materials in several layers, so that a protective cover of the required thickness is formed. Often, a primer is applied to the pipes, either by extrusion, electrostatic or otherwise, and on the Primarily the actual protective cover applied "So far, the protective cover itself must be protected against rapid aging, in particular by ultraviolet light" For this purpose, so far the Polyäthylenhars carbon zugemisoht - as already mentioned "This coal dust reduces some of the favorable properties of the polyethylene resin, eg "B _e, the resin is brittle, the various

- 3 - Berlin, d.U.3.1979 JU? P 16L / 209 472

Xsgen of casing do not bond well with each other ixi the resin adheres less well on a primer · However, polyethylene resin otherwise has the best properties ..f. .. ·? .the purpose of the sheathing of tubes · Ss should be as far as possible freshly formed resin ·

Sm on the pipes, a protective sheath of newly formed, unver-; ·; apply ischtem polyethylene resin, wherein the enclosure (sgen UV rays should be protected, at this _"purpose; ösäß the invention, a strip of polyethylene resin against certain width .. tir extruded from an extruder head and helically around the hole to be protected.

iskelt, namely directly on the primer · The extru-Msrte polyethylene tape is wound in several layers, ί ->>> that one obtains the desired thickness of the envelope. The '' last coat is added to coal dust as a sunscreen. The last layer can have the same or a different thickness. ,

C: iJ3ää0. of the invention, the tube is thus freshly extrusion ^»4; s wrapped polyethylene helically in several layers. li? the uppermost layer is given a light protection in the form of 1-11% deaf or the like.

An apparatus for carrying out the method is characterized by the fact that at least two extruders are provided for each one plastic strip or strip and each extruder is each provided with a guide or conveying track a Wickel- yxipt for simultaneously wrapping a tube with the extradierten ribbons is provided. ·

- 4 - "Berlin, d.14.3.1979 'AP F 161/209 472

exemplary

The invention will be explained in more detail below with reference to an exemplary embodiment.

Fig. 1: the wrapping device with two extruder heads «Fig. 2: part of the finished product _?

3 shows a variant of the wrapping device with two extruder heads »

The device according to FIG. 1 has two extruder heads 1 1 ^e , of which the extruded strips or strips are fed along a guide or conveying track 2 to a winding head 3, a layer structure having a lower layer 6 and an upper layer 6 , which rest on one another in area 7.

Figure 2 shows a schematic longitudinal section through a pipe 11 with the wrapping, which, however, is only drawn in part _β to the tube 11, a first layer or primer 10 is applied around which two layers 5 colorless material are wound strip-like, on Which . Finally, a layer 6 of blackened material is wound around. The windings are made so that the freshly extruded synthetic resin strips lie flush against each other laterally.

In FIG. 3, two extruder heads 1s 1 'are shown again. The extruded strips pass via guiding or conveying paths 2 (which are shown only schematically) to a winding head 4. The tube 11 is provided with a primer 10 which two layers 9; S are wound concentrically.

Claims (2)

Berlin, d.i4.3.1979 AP P 16L / 2O9 472 Claim for invention 1 # Method for applying a multilayer protective cover made of synthetic resin on pipes, characterized in that from two or more juxtaposed extruders each a strip or strip of synthetic resin is extruded, that the extruded strips are fed simultaneously to a winding head (3 »4) and by means of a single winding head (3 »4) helically in two or more concentric layers (5ϊ S; 8; 9) are wrapped around the tube (11). 2 · Apparatus for carrying out the method according to item 1, characterized in that at least two extruders are provided for each plastic strip or strip and each extruder by means of a respective guide or conveying track (2) with a winding head (3 »4) for simultaneous Wrapping a tube (11) is provided with the extruded ribbons · '-' For this purpose / f page drawing