Helix core rod type screw mixing refining head

Abstract

The present invention discloses a screw mixing head of screwed mandril type. The shape of a matrix of the screw mixing head is the shape of a round table or a cone, and a screwed slot is arranged at the lateral surface of the round-table-shaped or cone-shaped matrix; or the shape of the matrix of the screw mixing head is column-shaped, and the screwed slot is arranged at the lateral surface of the column-shaped matrix. The depth of the screwed slot gradually shoals from being deep. The mixing head is mainly applied to the screw of an injection moulding machine or an extruding machine and has the characteristics of good effect of mixing, not accumulating material, low cutting, little increase of temperature, strong ability of self cleaning and wide application range, and can be used for processing the stable plastics such as PP, PE, ABS etc and is also fit for the plastics which can be easily analyzed and easily change color, such as PET, PVC, PC, PA etc.

Description

technical field [0001] The invention relates to a mixing element of a screw in a plastic processing machine, in particular to a screw mandrel type screw mixing head. Background technique [0002] The screw is one of the core components of the injection molding machine, which has the functions of conveying, melting, metering and injection. Injection molding machine screw generally adopts three sections: feeding section, compression section and metering section; there are also two sections: feeding section and compression section (no metering section). With the improvement of people's requirements for product quality, the requirements for the melting and plasticizing ability of the screw are also increasing, so the screw is required to have a better mixing function, so that the temperature of the melt is uniform and the color of the product is evenly distributed. A mixing section is designed on the metering section of the screw to realize this function. [0003] At present, ...

AI Technical Summary

Problems solved by technology

Although these two kinds of mixing heads are simple in structure, easy to process, low in cost and good in mixing effect, they have been favored by many domestic plastic machinery manufacturers, but these two kinds of mixing heads have shortcomings, which make them not suitable for materials. Good: The disadvantage of the pin type mixing head is that it is easy to accumulate materials and has poor self-cleaning ability. In the case of frequent color changes, a lot of materials need to be wasted. For materials that are easy to change color such as PET and PVC, due to long-term The accumulation of material will cause the injection molded products to easily change color, yellow and black; although the barrier type mixing head has good self-cleaning performance, the disadvantage is that the melt will pass through the gap of the barrier, which will generate high shear, which is not suitable for heat-sensitive materials such as PET, PVC, etc.

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