CN210792017U - A composite double-layer tube extruder die core - Google Patents

Abstract

The utility model discloses a compound double-deck pipe extruder mold core, the mold core includes inner mold core and outer mold core, inner mold core cup joints in the outer mold core, outer mold core outer wall is equipped with first runner, inner mold core outer wall is equipped with the second runner, outer mold core is equipped with and is used for the feed port of inner mold core feeding, outer inner mold core outer wall all is equipped with the runner structure of same shape, the runner structure includes a plurality of sprue and right a plurality of sprue reposition of redundant personnel again, the sprue is the even arc of roughly distributing, a sprue exit end communicates mutually. The utility model discloses it is even that the messenger is in the poor plastics of mobility under the molten condition such as EPDM ECO NBR material flow in the flow channel to the ejection of compact is abundant even, thereby makes inside and outside two-layer pipe wall distribution thickness of plastic double-layer pipe formed part even, has promoted product quality.

Description

A composite double-layer tube extruder die core

technical field

The utility model relates to the field of extruder die cores, in particular to a composite double-layer tube extruder die core

Background technique

In the production process of tubular plastic products, the plastic extrusion process is an important process in the production process, which will directly affect the molding quality of the product. The plastic extrusion process is to extrude the plastic pellets in a softened state by heating. Since the fluidity of the plastic pellets is different in the molten state, the different fluidity of different plastic pellets in the molten state will affect the die of the extruder head. It is particularly important to design the corresponding runner structure for the core. For plastics with poor fluidity (EPDM/ECO/NBR, etc.) when the plastic material is heated and in a molten state, the runner structure of the core is unreasonably designed, and the plastic is in the runner. If the flow is not uniform, there will be uneven distribution of the inner and outer walls of the composite double-layer tubular plastic molding, which will seriously affect the product quality.

Utility model content

The purpose of this utility model is to provide a composite double-layer tube extruder die core to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the utility model provides the following technical solutions:

A composite double-layer tube extruder die core, the die core includes an inner die core and an outer die core, the inner die core is sleeved in the outer die core, and the outer wall of the outer die core is provided with a first Gate, the outer wall of the inner mold core is provided with a second gate, the outer mold core is provided with a feeding hole for feeding the inner film core, and the outer walls of the outer inner mold core are provided with the same shape of flow A channel structure, the flow channel structure includes a plurality of main channels and a plurality of branch channels for redistributing the main channels, and the outlet ends of the branch channels are communicated with each other.

Preferably, the flow channel structure includes two main flow channels, the main flow channels are approximately evenly distributed arcs, the two main flow channels are divided into two branch flow channels, and the main flow channels and the branch flow channels are on the outer wall. are distributed symmetrically.

Preferably, the branch channel includes an end section of the branch channel, and the section of the end section gradually increases along the flow direction, so as to distribute the plastic with poor fluidity evenly in the molten state.

Preferably, the first gate and the second gate, which are perpendicular to the flow direction, are provided with diverting protrusions in the axial direction.

Preferably, the protrusions are triangular in cross-section so as to divert the flow of the plastic feed which is poor in flow in the molten state.

Preferably, the inner mold core and the outer mold core are tubular shapes with gradually decreasing cross-sections.

Preferably, the axis of the first gate is co-linear with the axis of the feed hole, and the axis of the feed hole is coplanar and parallel to the axis of the second gate.

Preferably, the outlet of the branch flow channel is located at the front end of the inner mold core and the outer mold core, so as to reduce the travel of plastic with poor fluidity in the molten state in the flow channel, so that the material output is abundant and uniform.

Compared with the prior art, the beneficial effects of the present utility model are:

The utility model is suitable for the plastic materials with poor fluidity in the molten state, such as EPDM/ECO/NBR materials, and the structure design of the flow channels on the outer walls of the inner and outer cores is reasonable, which can make the plastics with poor fluidity in the molten state, such as EPDM/ECO/NBR, reasonably designed. The NBR material flows evenly in the flow channel, and the discharge is abundant and even, so that the thickness of the inner and outer walls of the plastic double-layer pipe forming part is evenly distributed, and the product quality is improved.

Description of drawings

Fig. 1 is the plan view of the utility model;

FIG. 2 is an expanded view of the flow channel structure of the present invention.

In the figure: 1 outer core, 10 first gate, (11; 21) shunt protrusion, (12; 22) main runner, (13; 23) runner, 14 feed hole, 2 inner core, 20 second gate.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to FIG. 1 to FIG. 2, the present invention provides a technical solution: a composite double-layer tube extruder die core, the die core includes an outer die core 1 and an inner die core 2, the outer die core 1 The inner mold core 2 and the inner mold core 2 are in a tubular shape with a gradually decreasing cross-section; the inner mold core 2 is sleeved in the outer mold core 1, and the outer wall of the outer mold core 1 is provided with a first gate 10. 2. The outer wall is provided with a second gate 20, the outer mold core 1 is provided with a feed hole 14 for feeding the inner film core, and the axis of the first gate 10 is the same as the axis of the feed hole 14. Line, the axis of the feed hole 14 and the axis of the second gate 20 are coplanar and parallel. Both the first gate 10 and the second gate 20, which are perpendicular to the flow direction, are provided with triangular distribution protrusions (11; 21) in the axial direction, so as to uniformly distribute the plastic feedstock with poor fluidity in the molten state. The outer walls of the outer mold core 1 and the inner mold core 2 are provided with runner structures of the same shape, and the runner structures include two main flow channels (12; 22), and the two main flow channels (12; 22) are opened in the respective the gate, the two main flow channels (12; 22) are divided into two branch flow channels (13; 23) respectively, and the main flow channels (12; 22) and the branch flow channels (13; 23) are on the outer wall. symmetrical distribution. The main flow channel (12; 22) is an arc shape with approximately uniform distribution, the branch flow channel (13; 23) includes an upper section, a middle section and an end section, the upper section is communicated with the main flow channel, the section of the middle section is the narrowest, and the section of the upper section is the narrowest. It is larger than the middle section, and the section of the end section is the largest and the section of the end section gradually becomes larger along the flow direction. one part. In the same way, the outlet ends of all the branch runners on the outer wall of the inner core 2 communicate with each other, that is, the section of the outlet end of each branch runner is a quarter of the cross section, so that the plastic with poor fluidity in the molten state can be evenly divided. At the same time, the outlets of the branch runners (13; 23) of the outer core 1 and the inner core 2 are located at the front ends of the outer core 1 and the inner core 2, respectively, so as to reduce the flow of the plastic with poor fluidity in the molten state in the runner, so that the The output is rich and even.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a compound double-deck pipe extruder mold core, the mold core includes interior mold core and outer mold core, interior mold core cup joints in the outer mold core, outer mold core outer wall is equipped with first runner, interior mold core outer wall is equipped with the second runner, outer mold core is equipped with and is used for the feed port of interior mold core feeding, its characterized in that: the outer walls of the inner mold core and the outer mold core are provided with runner structures with the same shape, each runner structure comprises a plurality of main runners and a plurality of branch runners for redistributing the main runners, and outlet ends of the branch runners are mutually communicated.

2. The composite twin tube extruder mandrel of claim 1, wherein: the runner structure includes two sprue, the sprue is the arc that approximately distributes evenly, two sprue reposition of redundant personnel become two branch runners respectively, the sprue with branch runner all is the symmetric distribution on the outer wall.

3. The composite twin tube extruder mandrel of claim 1, wherein: the branch flow channel comprises a branch flow channel tail section, and the section of the tail section is gradually enlarged along the flow direction.

4. The composite twin tube extruder mandrel of claim 1, wherein: and the axial directions of the first pouring gate and the second pouring gate which are vertical to the flow direction are both provided with a flow dividing protrusion.

5. The composite twin tube extruder mandrel of claim 4, wherein: the cross section of the bulge is triangular.

6. The composite twin tube extruder mandrel of claim 1, wherein: the inner mold core and the outer mold core are in a pipe shape with the gradually reduced section.

7. The composite twin tube extruder mandrel of claim 1, wherein: the axis of the first gate is collinear with the feedhole axis, which is coplanar and parallel to the second gate axis.

8. The composite twin tube extruder mandrel of claim 1, wherein: and the outlets of the branch flow passages are positioned at the front ends of the inner mold core and the outer mold core.

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