CN203622894U

CN203622894U - Totally encapsulated type co-extrusion die head capable of removing weld marks

Info

Publication number: CN203622894U
Application number: CN201320652949.0U
Authority: CN
Inventors: 查安平; 王秀平; 王菁; 蒋标; 王鑫
Original assignee: TONGLING GREAT EXTRUSION TECHNOLOGY CO LTD
Current assignee: TONGLING GREAT EXTRUSION TECHNOLOGY CO LTD
Priority date: 2013-10-22
Filing date: 2013-10-22
Publication date: 2014-06-04
Anticipated expiration: 2023-10-22

Abstract

The utility model relates to a totally encapsulated type co-extrusion die head capable of removing weld marks. The co-extrusion die head comprises a compression plate and a co-extrusion pre-forming plate, wherein a co-extrusion feeding hole, a co-extrusion main flow channel, a primary co-extrusion branch flow channel, a secondary co-extrusion branch flow channel and an encapsulated flow channel are arranged on the compression plate; an annular transitional pressure-stabilizing flow channel and a parallel fusion region are arranged on the co-extrusion pre-forming plate; the section width of the encapsulated flow channel is gradually reduced in a material flow direction; the compression plate is provided with an annular pressure-equalizing groove at the joint between the encapsulated flow channel and the transitional pressure-stabilizing flow channel, and the depth of the pressure-equalizing groove is greater than that section width of the tail end of the encapsulated flow channel. The material flow pressure in the fusion region is uniform, the weld marks of a co-extrusion layer can be removed, the co-extrusion layer is uniform in thickness, and the appearance quality of a sectional material can be improved.

Description

Can eliminate the complete coated co-extrusion die head of weld mark

Technical field

The utility model relates to a kind of for extruding the co-extrusion die head of full coating plastic section bar, specifically a kind of complete coated co-extrusion die head of eliminating weld mark.

Background technology

In full coating plastic co-extrusion section bar is produced, co-extrusion material is divided into four strands by co-extrusion sprue through I and II co-extrusion runner conventionally, converges that to enter ring-type voltage stabilizing runner logical through coated runner, then major ingredient in healing parallel zone and die cavity is compound.The pressure of co-extrusion material in co-extruding flow channel, along with the variation of manufacturing condition, and expect that stream is subject to impacts such as " waller effects " after I and II co-extrusion runner in healing place, it is evenly synchronous that the pressure of co-extrusion material is difficult to reach, and bring following impact will to entirely coated section bar:

1, due to co-extrusion material pressure inequality, can cause local coextruded layer pressure little, major ingredient pressure is large, and the coated major ingredient of not coming of co-extrusion material, produces " showing money or valuables one carries unintentionally " phenomenon.

2, due to co-extrusion material pressure inequality, cause that a part of region co-extrusion material material is many or material is few, will make Surface of profile occur continuous or desultory bright line, concealed wire phenomenon.

3, due to co-extrusion pressure inequality, can cause different co-extrusion areal pressure differences, coextruded layer thickness there will be inhomogeneous each other, affects the apparent mass of section bar, causes the hydraulic performance decline of product.Particularly two stock material flowing pressure inequalities of the integration region of two coated runners as shown in Figure 1, easily form weld mark 93 between the basic unit 91 of composite pipe and coextruded layer 92.

Summary of the invention

The purpose of this utility model is for the deficiencies in the prior art part, and a kind of complete coated co-extrusion die head of eliminating weld mark is provided, and the material flowing pressure that enters integration region is more even, can avoid producing weld mark, improves section material appearance quality.

For achieving the above object, the utility model has adopted following technical scheme: comprise compressive plate and co-extrusion preformed board, compressive plate is provided with co-extrusion charging aperture, co-extrusion sprue, one-level co-extrusion runner, secondary co-extrusion runner and coated runner; In co-extrusion preformed board, have ring-type transition voltage stabilizing runner and lead to the healing parallel zone of mold cavity surface; The cross-sectional width of coated runner reduces gradually along material flow path direction; Compressive plate is provided with the balancing slit of ring-type at coated runner and transition voltage stabilizing runner joining place, the groove depth of balancing slit is greater than the cross-sectional width of coated flow field end.Co-extrusion material first flows into balancing slit through secondary co-extrusion runner, coated runner, enter again transition voltage stabilizing runner, because the groove depth of balancing slit is greater than the cross-sectional width that is coated flow field end, co-extrusion material from the secondary co-extrusion runner of pressure inequality spreads and merges in balancing slit, thereby makes the co-extrusion material pressure in balancing slit obtain uniformity.

Further, the cross-sectional width of transition voltage stabilizing runner reduces gradually along material flow path direction.Transition voltage stabilizing runner, to the further supercharging of co-extrusion material, makes product coextruded layer even thickness, can improve product appearance quality.

As shown from the above technical solution, the utility model by arranging balancing slit and pressurisable transition voltage stabilizing runner in compressive plate and preformed board, the material flowing pressure that makes to enter integration region is even, not only can eliminate the weld mark phenomenon that coextruded layer occurs, and coextruded layer even thickness, can improve section material appearance quality.

brief description of the drawings

Fig. 1 is the structural representation that existing composite pipe cross section exists weld mark.

Fig. 2 is the utility model structural representation;

Fig. 3 is along A-A line cutaway view in Fig. 2;

Fig. 4 is along B-B line cutaway view in Fig. 3.

detailed description of the invention

As shown in Figure 2, coated co-extrusion die head is made up of parts such as machine neck 6, spreader supporting plate 5, core supporting plate 4, compressive plate 3, co-extrusion preformed board 2, mouth template 1 and cores 7 entirely, and core 7 is arranged in the middle of core supporting plate 4.

As shown in Figure 3 and Figure 4, compressive plate 4 is provided with co-extrusion charging aperture 34, co-extrusion sprue 35, one-level co-extrusion runner 36, secondary co-extrusion runner 37 and coated runner 32, one-level co-extrusion runner 36, secondary co-extrusion runner 37 are separately positioned on entering charge level and going out charge level of compressive plate 3, one-level co-extrusion runner 36 ends communicate with secondary co-extruding flow channel 37 by tap hole 31, and the cross-sectional width of coated runner 32 reduces gradually along material flow path direction.

The healing parallel zone 22 that has ring-type transition voltage stabilizing runner 21 in co-extrusion preformed board 2 and lead to die cavity 8 surfaces, the cross-sectional width of transition voltage stabilizing runner 21 reduces gradually along material flow path direction.

Compressive plate 3 is provided with the balancing slit 33 of ring-type at coated runner 32 and transition voltage stabilizing runner 21 joining places, the groove depth of balancing slit 33 is greater than the cross-sectional width of coated runner 32 ends, make the pressure in balancing slit 33 be less than the pressure that is coated runner 32 ends, when material is flowed through cross section while gradually entering balancing slit 33 after narrow coated runner 32 superchargings, material stream reduces in balancing slit 33 internal pressures, can spread, merge along balancing slit 33, until pressure uniformity.

After base-material plastifies by extrusion main unit, the machine neck 6 that is entered co-extrusion die head by the direction of arrow of Fig. 2 is tentatively shunted, then enter current stabilization and compressional zone---supporting plate 4, compressive plate 3, while arriving co-extrusion preformed board 2 discharging opening, material extrusion fuses at healing parallel zone 22 together, finally by crossing the straight moulding of mouth template 1, just obtain extruded parisons.After co-extrusion material plastifies by co-extrusion machine, enter co-extrusion sprue 35 from the co-extrusion charging aperture 34 of compressive plate 3, enter balancing slit 33 through one-level co-extrusion runner 36, tap hole 31, secondary co-extrusion runner 37 and coated runner 32 successively again, transition voltage stabilizing runner 21 in co-extrusion preformed board 2 and healing parallel zone 22 again, with the matrix composition in die cavity 8.

Claims

1. can eliminate the complete coated co-extrusion die head of weld mark, comprise compressive plate (3) and co-extrusion preformed board (2), compressive plate (3) is provided with co-extrusion charging aperture (34), co-extrusion sprue (35), one-level co-extrusion runner (36), secondary co-extrusion runner (37) and coated runner (32); The healing parallel zone (22) that has ring-type transition voltage stabilizing runner (21) in co-extrusion preformed board (2) and lead to die cavity (8) surface; It is characterized in that: the cross-sectional width of coated runner (32) reduces gradually along material flow path direction; Compressive plate (3) is provided with the balancing slit (33) of ring-type at coated runner (32) and transition voltage stabilizing runner (21) joining place, the groove depth of balancing slit (33) is greater than the cross-sectional width of coated runner (32) end.

2. the complete coated co-extrusion die head of eliminating weld mark according to claim 1, is characterized in that: the cross-sectional width of transition voltage stabilizing runner (21) reduces gradually along material flow path direction.