CN2616364Y

CN2616364Y - Plastic-extrusion section material full-cladding coextrusion mould

Info

Publication number: CN2616364Y
Application number: CNU032515545U
Authority: CN
Inventors: 胡火根; 查安平; 傅啸; 伍新安; 何豪佳; 张金银; 邓江艳
Original assignee: SANJIA MOULDS CO Ltd TONGLING
Current assignee: Sanjia Science and Technology Co., Ltd., Tongling
Priority date: 2003-04-30
Filing date: 2003-04-30
Publication date: 2004-05-19
Anticipated expiration: 2013-04-30

Abstract

The utility model relates to a plastic-extrusion section material full-cladding co-extrusion mould. A co-extrusion flow channel in the mould head is composed of a main flow channel and a plurality of branching flow channels at different levels, wherein the main flow channel and every branching flow channel at different levels are respectively arranged on different layers. The tail ends of the main flow channel and every branching flow channel at different levels are provided with guiding flow channels communicated with the branching flow channels at next levels. Because the direction of every branching flow channel at different levels is changed by the guiding flow channel and then the flow is divided, the pressure in two branching flow channels at the same level is uniform and stable. Thus, the thickness of the co-extrusion layer is uniform. Moreover, every branching flow channel at different levels is reasonably distributed on every layer. Thus, overlarge pressure on the same layer is avoided, and material leakage between mould plates can be well prevented.

Description

A kind of extruded plastic profile coats co-extruding mould entirely

Technical field

The utility model relates to and a kind ofly is used to produce the extruded plastic profile that evenly coats coextruded layer around the section bar and coats co-extruding mould entirely, and specifically a kind of die head has the co-extruding mould of multistage co-extruding flow channel.

Background technology

The extruded plastic profile co-extruding mould is to be used for producing the extruded plastic profile with composite bed, is divided into local co-extrusion and complete two kinds of the co-extrusions that coat.The at present domestic co-extruding mould that has only the local co-extrusion of production does not still have the full report that coats co-extruding mould of exploitation.And the full coating co-extruding mould of external exploitation, die head is provided with base-material runner and co-extruding flow channel, co-extruding flow channel is made up of sprue and some grades of runners, sprue is not held to both sides and is divided into two first order runners, each does not hold first order runner and is divided into two second level runners again, every grade of runner is divided into the next stage runner successively backward, and last level runner communicates by the compound runner of co-extrusion gap with base-material runner rear end.Because sprue and runner at different levels are positioned on the same aspect, sprue and runner at different levels are shunted on same aspect, cause with the melt pressure inequality in two runners of one-level, the pressure of a runner is big and the pressure of another runner is little, cause the uneven thickness of coextruded layer easily, can cause material to overflow again between template.Thereby this mould only is applicable to and extrudes the simple full pipe class section bar that coats.

Summary of the invention

To be solved in the utility model is that extruded plastic profile coats the problem of the interior co-extruding flow channel of co-extruding mould die head with the melt pressure inequality in two runners of one-level entirely.

Solution of the present utility model is: sprue in the die head and runner at different levels are located at respectively on the different aspects, and sprue and runner at different levels are not held the pilot flow that communicates with the next stage runner.

In order to make material diversion more even, sprue and runner at different levels are positioned on the aspect that is parallel to each other, and pilot flow is vertical with next stage runner place aspect.

The utility model is owing to shunt after the sprue of co-extruding flow channel and runner at different levels change direction by pilot flow in the die head, make with the pressure in two runners of one-level uniform and stable, thereby make that the thickness of coextruded layer is even; Again because sprue and runner at different levels are located on the different aspects respectively, make runners at different levels on each aspect, rationally to distribute, both can avoid excessive at same aspect pressure, can effectively utilize the locus rationally to arrange the fixedly trip bolt of co-extrusion template again, make the interplate connection of co-extrusion tight, can prevent flash between template preferably.

Description of drawings

Fig. 1 is the utility model die head schematic diagram.

Fig. 2 is along A-A line rotation profile among Fig. 1.

Fig. 3 is along B-B line cutaway view among Fig. 2.

Fig. 4 is along the rotation profile of A-A line embodiment two among Fig. 1.

Fig. 5 is along the rotation profile of A-A line embodiment three among Fig. 1.

The specific embodiment

By Fig. 1, Fig. 2 and shown in Figure 3, the utility model extruded plastic profile coats the die head of co-extruding mould entirely by base-material feed template [13], compressive plate [12], second preformed board [11], first preformed board [10] and profiled sheeting [9] are formed, compressive plate, second preformed board, the centre of first preformed board and profiled sheeting has the moulding die cavity, compressive plate, die cavity on second preformed board and first preformed board and the gap of inserting between [7] constitute base-material runner [14], the die cavity of profiled sheeting and insert between [7] and to constitute the base-material compound runner [6] of material extrusion together, co-extruding flow channel is by sprue [5], first order runner [3], second level runner [1] and third level runner [2] are formed, and eight third level runners [2] are distributed in around the die cavity and by the co-extrusion gap [15] that is opened on the profiled sheeting [9] and communicate with compound runner [6].Sprue [5] and two first order runners [3] and eight third level runners [2] are opened on profiled sheeting [9], four second level runners [1] are opened on second preformed board [11], sprue, first order runner, second level runner and third level shunting are in respectively on the aspect that is parallel to each other, sprue [5] is not held by pilot flow [4] and is communicated with first order runner [3], [3] two of first order runners are not held and are communicated with second level runner [1] by pilot flow [4], four second level runners [1] are terminal to communicate with third level runner [2] by pilot flow [4], and each pilot flow [4] is vertical with the aspect at runner place, two ends.During work, base-material injects die cavity by base-material runner [14], the co-extrusion material is injected by co-extruding flow channel, behind sprue and pilot flow thereof, be divided into two and enter first order runner and pilot flow thereof, be divided into again four enter second level runner and pilot flow thereof after, be divided into eight and enter third level runner, clamp-on compound runner all around along the co-extrusion gap from die cavity again, with the base-material composite molding.Because sprue and runner at different levels are located on the different aspects respectively, make that the space between second level runner [1] and the third level runner [2] is bigger, two trip bolts [8] can be installed, and it is tightr that each plate is connected, and can prevent flash between template preferably.Each runner changes at an angle of 90 after the direction by pilot flow and flows in the next stage runner, makes with the pressure in two runners of one-level uniform and stablely, to compound runner uniform feeding, thereby makes that the thickness of coextruded layer is even.

In embodiment two, sprue of the present utility model [5] also can be opened on first preformed board [10], and its structure as shown in Figure 4.

In embodiment three, sprue of the present utility model [5] also can be opened on compressive plate [12], its structure as shown in Figure 4, first order runner [3] is opened on second preformed board [11], has the pilot flow [4] that communicates with second level runner [1] on second preformed board.

Runner is three grades in the foregoing description.The utility model runner can be a two-stage; And being used for the profile shapes of extrusion profile section complexity, its runner also can be level Four or Pyatyi or more multistage.

Claims

1, a kind of extruded plastic profile coats co-extruding mould entirely, and die head is provided with base-material runner [14] and co-extruding flow channel, and base-material runner rear end is compound runner [6]; Co-extruding flow channel is made up of sprue [5] and some grades of runners, sprue [5] is not held to both sides and is divided into two first order runners [3], every grade of runner is not held and is divided into the next stage runner successively backward, and last level runner communicates by co-extrusion gap [15] compound runner [6] with base-material runner [14] rear end; It is characterized in that sprue and runner at different levels lay respectively on the different aspects, sprue and runner at different levels are not held the pilot flow [4] that communicates with the next stage runner.

2, co-extruding mould according to claim 1 is characterized in that sprue and runner at different levels are positioned on the aspect that is parallel to each other.

3, co-extruding mould according to claim 1 and 2 is characterized in that runner has two to level Four.

4, co-extruding mould according to claim 3 is characterized in that pilot flow is vertical with next stage runner place aspect.