SU1570929A1 - Extrusion head for manufacturing laminated tubes from polymeric materials - Google Patents

Abstract

The invention relates to equipment for the production of laminated pipes and hollow composite plastic products. The purpose of the invention is to improve the quality of products during the extrusion of three-layer pipes by introducing another polymer into the middle layer of the pipe wall and improving the welding of the layers. The extrusion head includes a housing in which a carrier with a cylindrical section is located. In the cylindrical section holes are made for the passage of the melt. The mandrels are mounted to form a forming slit and channels for supplying various melt streams. In the holder, there is a feed channel for supplying the internal melt flow and a spherical recess with a sharp annular edge. An adjusting screw is installed at the input of the supply channel. At the outlet of the feed channel is installed tip with the formation of a conical annular hole. When the head is operating, the internal, middle and external melt streams pass through the corresponding channels. In the forming gap, the overlapping of flows occurs on each other, their welding and the formation of a three-layer pipe. A tighter material is used for the middle layer of the pipe than for the outer and inner layers. This makes it possible to improve the quality of pipes and use them in the production of self-supporting structures. 2 Il.

Description

The invention relates to the processing of polymeric materials, in particular, equipment for the production of laminated pipes and hollow composite products made of plastics.

The aim of the invention is to improve the quality of products during the extrusion of three-layer pipes by introducing another polymer into the middle layer of the pipe wall and improving the welding of the layers.

FIG. 1 shows an extrusion head, a longitudinal section; in fig. 2 is a section A-A in FIG. one.

The extrusion head contains a detachable housing 1, in which the

Dorodholder 2 with a cylindrical section 3 with openings 4 in it for the passage of the external melt flow and adjustment screws 5. In the Dornholder 2 there is a supply channel 6 located along the central axis for supplying the inner melt with an adjusting screw 7 at the inlet and a spherical recess 8 with an acute annular edge 9 to separate the melt stream.

At the outlet of the feed channel 6, a nozzle 10 is installed, consisting of a confuser 11 and a cone 12 connected by rigidly threaded rods 13 and mounted

ate 1

about

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with the possibility of forming a conic holder 2 enters channel 22 and further

an annular opening 14 for distributing through the openings of the additional grate 24

the melt flow in the radial direction. in the conical part of the forming sleeve 16

On the cone 12, the tip 10 is fastened and superimposed as an outer layer

flax mandrel 15. On case 1 there are 5 pipes installed on two already merged layers. Adjusting sleeve 16. Dorn 15 mounting of the polymer melt flow rate for

The bath with the possibility of centering the outer layer of the pipe is carried out with the help of screws 17 and in it is made by blocking the openings 4 into the duct channel 18 for the cooling medium, which is connected with the adjusting screws 5.

with pipe 19. Between the mandrel 15 When the inner middle layer is layered

and the sleeve 16 is formed by the forming gap 201 ° and the external flows of the melt on each

In case 1 a mandrel mounted 21 a friend welds them,

with the formation of channels 22 for medium-next with a joint flow of two

second melt stream and channel 23 for extrinsic-combined melts in the form of a ring flow. The channels 22 and 23 of the common composite stream with three concentrates with the forming gap 20. For the central 15, downstream layers form

mandrel 21 in a cylindrical part of a three-layer tubular product,

the socket of the forming slit 20 is installed. As the first and third layer, the optional grating 24 on the way externally uses a softer poline of the melt in the channel 23. polymer-type gauge, and the middle layer

(core) can be molded from more

Channel 22 is equipped with a lattice 2520 of a rigid polymer of the type of polystyrene and smog holes 26 and adjusting wine-sheet materials. Each layer is not curled 27 with semi-cylindrical work from each other and its thickness and

areas located in the open-radial irregularity, as well as

so x 26 lattices 25 (fig. 2). speed and pressure can be adjusted

The body 1 of the head is connected to the extrude-25 by means of adjusting screws 5, 7 and 27.

By means of flanges (not shown) by means of flanges, the proposed invention is most preferred by 28 and 29. Channels 30 and 31 of wall tubular products are used to feed the melt from extrusion in the production of self-supporting thick-bodied cars.

The extrusion head works in barely experimental studies in a conductive manner.

Polymer melts injected by extrusion from two extruders and forming heads are passed into channels 30 and 31. Ras-Ki. Received by coextrusion

the melt of the first material for the inner three-layer composite pipes (inside the outer layers of the pipe in the channel 30; the first and outer third layers

separated by a sharp annular edge 9 were made of low pressure internal and external polyethylene. Grades 277-73 GOST 16338-85,

The internal melt flow was pressed-35 and the second middle layer (core) of

further through a spherical groove of polystyrene grade GOST 20282-

8, in which a retaining zone is formed, 74) with an outer diameter of 50 mm, the thick polymer enters the feed channel 6, but 4 mm.

and then through tip 10, as a result of the second middle layer of the passage through the conical ring, use polymeric waste, and version 14 distributes the internal flow, 4 and also dispose of resinous and other materials radially, pipe layer. Adjusting the flow rate The inner and outer layers of the injection — the internal melt flow — were polymerized with an extruder of the ATL-45-P type with a screw — made by changing the tube with a diameter of 45 mm and a length of 1125 mm, the flow section of the feed channel 6 control-45 and the middle layer filed with an extruder with a lithing screw 7.worm with a diameter of 40 mm and a length of 640 mm. The melt of the second material for the medium — Experimental studies of the extruded layer of the pipe enters through the channel of the 313d head for the manufacture of a slispendicular to the channel 22, then, the flexible pipes made of polymeric materials of the no-direction in the channel 22, flow has been shown to ensure The increase in wa passes through the opening 26 of the grid 2550 of quality and mechanical strength of the combi and then layered on the melt of polymerized three-layer pipes, as well as on the inner layer of the pipe, forming a medium that improves the uniformity of the distribution its layer. thickness of layers and welding of various. Adjustment of the melt flow rate of polymeric layers of polymer melt flows between the middle layer for the middle layer is done with itself. Due to this combination, the hardness of the change in the flow area of the hole 55 and soft polymers in a three-layer tube 26 by means of the adjusting screws 27 of the pipe. Chips and cracks are eliminated through the external flow of the melt through the hole of the pipe surface. Such pipes, when they were four cylindrical sections 3, under test, withstood an internal pressure of up to 3.0 MPa, so that they could replace completely metal pipes.

Claims (1)

Invention Formula An extrusion head for the manufacture of laminated pipes made of polymeric materials, comprising a housing, an arch holder with a cylindrical section in which holes for the melt passage are made, mandrels mounted in the housing to form a forming slot and channels for supplying various melt streams, and a grating ten lattice versus, in order to improve the quality of products during extrusion of three-layer pipes by introducing another polymer into the middle layer of the pipe wall and improving the welding of layers, the feed channel for the internal melt and spherical a recess with a sharp annular edge for dividing the melt flow, with the holder holding the adjustment screw placed at the inlet of the feed channel and the tip mounted at the outlet end e feed channel with the ability with holes and adjustment screws- 15 for the formation of a conical ring bore, made with semi-cylindrical tees to distribute the melt flow by working sections located in the radial direction from. lattice versus, in order to improve the quality of products during extrusion of three-layer pipes by introducing another polymer into the middle layer of the pipe wall and improving the welding of layers, the feed channel for the internal melt and spherical a recess with a sharp annular edge for dividing the melt flow, with the holder holding the adjustment screw placed at the inlet of the feed channel and the tip mounted at the outlet end e feed channel with the ability nineteen thirty shig.1 g 25 21 FIG. 2