CN2336949Y

CN2336949Y - Plastic three-layer co-extruding machines heads for tubes

Info

Publication number: CN2336949Y
Application number: CN98208800U
Authority: CN
Inventors: 王守信
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-04-18
Filing date: 1998-04-18
Publication date: 1999-09-08
Anticipated expiration: 2008-04-18

Abstract

The utility model relates to a processing forming device for a compound pipe with three layers of plastics. The utility model is composed of connectors in an inner, a middle and an outer layers of an extruding machine, a machine head body, a shunting cone, finish molds in an inner, a middle and an outer layers, a core rod and a plurality of flow passages in a machine head. The utility model is characterized in that the machine head is provided with three separately independent flow passages and three extruding machines to feed separately and independently; the feed angles of the flow passages are arranged reasonably to compensate the defects of the prior art sufficiently. Various three layers of compound pipes composed by A, B and C materials can be produced, and the thickness of the three layers can be adjusted independently for increasing production efficiency and improving the physical property of pipe materials and the appearance quality of the pipe materials.

Description

The three-layer co-extruded pipe die of plastics

The utility model relates to the machine-shaping device of three-layer plastic multiple tube.

In the prior art, the head that is used for the three-layer plastic compound pipe molding mainly is the connector that is connected with two extruders by respectively, and body, interior minute flow cone, external shunt ring cone, external shunt sleeve and intermediate distributary tube and mouthful mould, mandrel are formed.Simultaneously the molten plastic of two kinds of different formulations is sent into by two extruders and to be extruded three layers of pipe in the three-layer co-extruding machine head, handle back formation tubing through operations such as external diameter typing and coolings again.The patent No. of inventor's design has been announced three-layer co-extruded plastic core foaming pipe die for the ZL95230128.8 patented technology, and this is typical case of the prior art.Be characterized in adopting two extruders, wherein on the center line that is arranged in unit, molten plastic is clamp-oned the inside and outside layer of head, and another is vertical with center line, and the molten plastic of extruding is clamp-oned middle foaming layer (or packed layer) by the aperture of shunting in the support ribs.Mainly there are five problems in this head: (1) can only produce the three-layer composite pipe of A, B, two kinds of materials of A, is restricted with regard to the range of application that makes pipe die.(2) according to domestic and international foamed core pipe standards, with the most frequently used Φ 110UPVC foamed core pipe is example, tube wall gross thickness 3.2mm, inside and outside layer respectively is 0.5mm, the intermediate layer is 2.2mm, as seen production efficiency depends primarily on the intermediate layer, and head intermediate layer runner will be by the aperture on the shunting support ribs, and sectional area can not be excessive, and this just certainly will make pressure increase, form the larynx footpath, restricted the raising of production efficiency.(3) the ectonexine melt must flow through the shunting support, and the ectonexine that is segmented in through shunting the stent support rib stays the spue line that is difficult to eliminate, and influences product quality and outward appearance.(4) two extruders becomes 90 ° of layouts, intermediate layer extruder inlet melt flows direction and pipe forming direction differ 90 ° of angles, the interlayer melted fluid is difficult for arriving a mouthful mould simultaneously on 360 ° of directions of circumference, easily the mouth mould is squeezed partially when particularly just having driven, and makes tube wall thickness inhomogeneous.(5) ectonexine thickness can not be regulated separately.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, a kind of three independent runners that have are provided, with three extruder co-extrusions, can really produce various by A, B, three kinds of materials of C are formed and the threeply degree all can be regulated separately the three-layer co-extruded pipe die of plastics.

Technical solution of the present utility model is, the three-layer co-extruded pipe die of plastics by in the extruder, ectonexine connected body, handpiece body, branch flow cone, mouth mould and intermediate layer mouth mould, internal layer mouth mould, outer mouthful mould, plug and many runners in head constitute, special is, above-mentioned runner has three, that is: the three-layer co-extruded pipe die head of plastics inlet by connected body, the intermediate layer runner that divides flow cone, shunting support, intermediate layer mouth mould and internal layer mouth mould to constitute; The outer runner that constitutes by connected body, handpiece body, outer mouthful mould and intermediate layer mouth mould of the first side entrance of slave; From the head opposite side with outer runner inlet symmetry inlet by the hole in connected body, handpiece body, intermediate layer mouth mould, the shunting stent support rib, the internal layer runner of internal layer mouth mould and plug formation; Intermediate layer runner, outer runner and internal layer runner connect by the same extruder separately of connected body separately; Outside in the laminar flow road, connected body and handpiece body have constituted the outer runner straightway that is used to carry outer material, handpiece body, outer mouthful mould and intermediate layer mouth mould have constituted outer runner helical annular section, and the center line of outer runner straightway becomes the α angle with the head axial line; In the internal layer runner, connected body, hole in handpiece body, the shunting stent support rib, and the intermediate layer mouth mould that is passed and internal layer mouth mould have constituted the internal layer runner straightway that is used to carry the internal layer material, internal layer mouth mould and plug have constituted internal layer runner helical annular section, and the center line of internal layer runner straightway also becomes the α angle with the head axial line; The value at aforesaid two α angles equates with the helical angle of inside and outside laminar flow road helical annular section; A shunting support is set in the runner of intermediate layer; On the head axial line, the centre of shunting support is equipped with pull bar, and the one end is close to divide flow cone, and is fixed on the shunting support, and the other end is located with locking nut.

Design philosophy of the present utility model is, the three-layer co-extruded pipe die of plastics is designed to have three independently runners, enable with three extruder co-extrusions, can really produce the various three-layer composite pipes of forming by A, B, three kinds of materials of C, and the threeply degree can be regulated all separately by extruder separately.Head adopts the big specification extruder in the middle of being arranged in directly melt to be clamp-oned the intermediate layer runner, and the former head of sectional area ratio increases several times, thoroughly eliminates the larynx footpath, and extrusion capacity will obviously increase under extruder specification the same terms.This head ectonexine feed adopts two extruders, and the angle of their feeding section center line and head axis and the helical angle of the inside and outside laminar flow of head road helical annular section are consistent, can make mobile fusion materials flow arrive a mouthful mould smoothly, and the assurance tube wall thickness is even.In addition, ectonexine fusion materials flow directly arrives a mouthful mould by inside and outside laminar flow road helical annular section, has thoroughly eliminated the ectonexine spue line, can improve the physical property and the presentation quality of tubing.

Accompanying drawing 1 is the structural representation of the three-layer co-extruded pipe die of plastics

Accompanying drawing 2 is shunting supporting structure schematic diagram

Be embodiment of the present utility model below, in conjunction with the accompanying drawings the utility model is described further: as shown in Figure 1, this head is promptly connecting an extruder by intermediate layer extruder connected body (1), internal layer extruder connected body (12) and outer extruder connected body (10) separately by three independent separately feed of extruder.The intermediate layer runner (15) of this head is made of intermediate layer extruder connected body (1), branch flow cone (2), shunting support (11), intermediate layer mouth mould (6) and internal layer mouth mould (3).Outer runner (14) is made of outer extruder connected body (10), handpiece body (5) and outer mouthful mould (7) and intermediate layer mouth mould (6).Internal layer runner (13) is by the hole (21) in internal layer extruder connected body (12), handpiece body (5) and intermediate layer mouth mould (6) and the shunting stent support rib (20), and internal layer mouth mould (3) and plug (8) constitute.Mouth die clearance (22) is made of a plug (8) and a mouthful mould (9).Pull bar (4) is installed on the head axial line (16), and the one end is fixed on the shunting support (11), and the other end is equipped with locking nut (17).The center line of the internal layer runner straightway that internal layer extruder connected body (12) is connected is represented with label (18), the center line of the outer runner straightway that outer extruder connected body (10) is connected is represented with label (19), (18) become inclined angle alpha with the axial line (16) of the three-layer co-extruded pipe die of plastics respectively with (19), its value equates with the helical angle of inside and outside laminar flow road (13), (14) helical annular section.

By accompanying drawing 2 as seen, be provided with shunting stent support rib (20) on shunting support (11), a ribs is provided with hole (21) therein, and visible center line (18) coaxial inner conductor (16) becomes inclined angle alpha among the figure.

The melting charge stream of extruding from intermediate layer feed extruder enters head by connected body (1), flows down at the branch of a minute flow cone (2) and enters intermediate layer runner (15) ringwise.The fusion materials flow that outer feed extruder is extruded enters outer runner (14) through connected body (10), extrudes ringwise behind outer runner.The fusion materials flow that internal layer feed extruder is extruded enters internal layer runner (13) through connected body (12), through also extruding ringwise behind the internal layer runner.Three layers of melt flow stream that formed by inside and outside and intermediate layer runner are in that to enter porch, annular die gap (22) compound, extrude the formation pipe through behind further compression combined in the process of inlet port die clearance, through supercooling, sizing and tubulation subsidiary engine have just formed three layers of composite plastic pipe again.

The utility model compared with prior art has following features: this head utilizes three independently streams Road and the charging angle of reasonably arranging three independent runners have fully remedied the deficiencies in the prior art, both The various three-layer composite pipes that formed by A, B, three kinds of materials of C can be produced, threeply degree energy can be made again Regulate separately, thoroughly eliminate simultaneously the larynx warp, improved production efficiency, avoided original technology to produce The lip-deep spue line of inside and outside layer improved physical property and the presentation quality of tubing.

Claims

1. the three-layer co-extruded pipe die of plastics, mainly be by in the extruder, inside and outside layer connected body (1), (12), (10), handpiece body (5), divide flow cone (2), in, inside and outside layer mouthful mould (6), (3), (7), mouthful mould (9), plug (8) and many runners in head constituted, it is characterized in that:

A) above-mentioned runner has three, that is: the intermediate layer runner (15) by connected body (1), branch flow cone (2), shunting support (11), intermediate layer mouth mould (6) and internal layer mouth mould (3) formation that enters the mouth at the three-layer co-extruded pipe die head of plastics; The outer runner (14) by connected body (10), handpiece body (5), outer mouthful mould (7) and intermediate layer mouth mould (6) formation of the first side entrance of slave; From the internal layer runner (13) by hole (21) in connected body (12), handpiece body (5), intermediate layer mouth mould (6), shunting stent support rib (20), internal layer mouth mould (3) and plug (8) formation of head opposite side with outer runner inlet symmetry inlet;

B) intermediate layer runner (15), outer runner (14) and internal layer runner (13) are by the same extruder connection separately in separately connected body (1), (10), (12);

C) outside in laminar flow road (14), connected body (10) and handpiece body (5) have constituted the outer runner straightway that is used to carry outer material, handpiece body (5), outer mouthful mould (7) and intermediate layer mouth mould (6) constitute outer runner helical annular section, and the center line of outer runner straightway (19) becomes the α angle with head axial line (16); In internal layer runner (13), hole (21) in connected body (12), handpiece body (5) the shunting stent support rib and the intermediate layer mouth mould (6) that is passed and internal layer mouth mould (3) have constituted the internal layer runner straightway that is used to carry the internal layer material, internal layer mouth mould (3) and plug (8) have constituted internal layer runner helical annular section, and the center line (18) of internal layer runner straightway also becomes the α angle with head axial line (16); The value at aforesaid two α angles equates with the helical angle of inside and outside laminar flow road helical annular section;

D) a shunting support is set in intermediate layer runner (15);

E) on head axial line (16), the centre of shunting support (11) is equipped with pull bar (4), and the one end is close to divide flow cone (2), and is fixed on the shunting support, and the other end is used locking nut (17) location.