Injection molding screw rod suitable for novel POM

Abstract

A screw body is divided into four stages, the four stages are sequentially a non-return section, a feeding section, a heating section and an extrusion section from head to tail, the screw pitch of the feeding section is wide, materials are rapidly pushed to the next stage from the feeding section after entering from a feeding port of an injection molding machine, the screw pitch of the non-return section is short, and the heating section is connected with the extrusion section. The heating section is not provided with a thread structure and is only provided with protrusions used for stirring the materials, the materials are heated by a machine barrel heating mechanism after entering the heating section, the extrusion section is a short-thread-pitch section, the movement speed of the hot-melt materials is reduced after the hot-melt materials enter the extrusion section, and the extrusion speed is reduced after the hot-melt materials enter the extrusion section. Therefore, the materials can be accumulated and pressurized in the heating section, and an environment more suitable for material processing is generated.

Description

Technical Field

[0001] The utility model relates to the technical field of screws, and particularly relates to an injection screw applicable to a new type of POM. Background Art

[0002] POM, whose full name is polyoxymethylene, is a chemical product widely used in the field of engineering plastics. POM is suitable for injection molding under the conditions of "medium pressure, medium speed, low material temperature, and relatively high mold temperature". When forming precision products, the mold temperature needs to be controlled. When injecting POM materials, the holding pressure should be relatively large to reduce the pressure drop. The screw speed cannot be too high, and the residue should be small. Therefore, the requirements for injection screws are relatively high. Content of the Utility Model

[0003] Aiming at the deficiencies existing in the prior art, the purpose of the utility model is to provide an injection screw applicable to a new type of POM, and solve the current pain points in this field.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] An injection screw applicable to a new type of POM, the rod body is divided into four stages, and the four stages are in sequence from beginning to end as the check section, the feeding section, the heating section, and the extrusion section. Among them, the pitch of the feeding section is wider than that of the check section and the extrusion section, and the heating section has no thread structure.

[0006] A protrusion for stirring the material is arranged on the heating section.

[0007] To sum up, the beneficial effects of the utility model compared with the prior art are as follows: The screw is divided into four stages. After the material enters from the feeding port, it is quickly fed through the feeding section, extruded and pressurized in the heating section, and continuously stirred at the same time, providing more suitable conditions for the injection molding of POM materials. Description of the Drawings

[0008] By referring to the drawings and reading the following detailed description, the above and other purposes, features, and advantages of the exemplary embodiments of the utility model will become easy to understand. In the drawings, several embodiments of the utility model are shown in an exemplary rather than restrictive manner, where:

[0009] Figure 1 It is a schematic structural diagram of an injection screw applicable to a new type of POM.

[0010] Explanation of the reference numerals: 1. Check section; 2. Feeding section; 3. Heating section; 4. Extrusion section. Detailed Embodiment

[0011] The following further details the utility model in conjunction with the drawings.

[0012] An injection screw applicable to a new type of POM, the rod body is divided into four stages, and the four stages are, in order from beginning to end, the non-return section 1, the feeding section 2, the heating section 3, and the extrusion section 4. The pitch of the feeding section 2 is relatively wide, and after the material enters from the feeding port of the injection molding machine, it is quickly pushed to the next stage by the feeding section 2. The pitch of the non-return section 1 is relatively short, which can prevent the material from flowing back. The heating section 3 has no thread structure and only has protrusions for stirring the material. After the material enters this section, it is heated by the barrel heating mechanism and is pushed by the material sent by the feeding section 2. The extrusion section 4 is a short pitch section. After the melted material enters the extrusion section 4, its moving speed slows down, so that the material can accumulate pressure in the heating section 3, creating a more suitable environment for material processing.

[0013] The above description is only an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An injection molding screw applicable to a new type of POM, characterized in that: The rod body is divided into four stages, which are, in sequence from beginning to end, the reverse stop section (1), the feeding section (2), the heating section (3), and the extrusion section (4). Among them, the pitch of the feeding section (2) is wider than that of the reverse stop section (1) and the extrusion section (4), and the heating section (3) has no threaded structure.

2. The injection screw applicable to the new POM according to claim 1, wherein: Protrusions for stirring the material are provided on the heating section (3).

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