Single-screw structure for mixing of plastic extruder

By employing a single-screw structure with a mixing section and a positioning ring in the plastic extruder, the problems of uneven color and poor plasticization caused by uneven mixing of color masterbatch are solved, and the full mixing and uniformity of the melt are achieved.

CN120886453AInactive Publication Date: 2025-11-04SUZHOU BESTAR BLOW MOLDING MASCH CO LTD
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Patent Information

Application Number
CN202511142763.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-15
Publication Date
2025-11-04
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

Existing plastic extruders have problems with uneven color and poor plasticization when producing colored products. This is mainly due to insufficient mixing of the masterbatch in the extruder, which results in uneven color on the product surface or residual masterbatch particles that have not dissolved.

Method used

A single-screw structure for mixing in a plastic extruder is adopted. A mixing section is set at the rear of the screw body. The mixing section consists of mixing teeth arranged in a spiral shape. Mixing external teeth are fixed at the tail of the screw. A positioning ring is installed at the tail of the barrel. Mixing internal teeth are set in the inner hole of the positioning ring. The mixing external teeth and internal teeth are axially offset to achieve full mixing of the molten plastic at the positioning ring.

Benefits of technology

It achieves thorough mixing and dispersion of color masterbatch and raw materials, solving the problems of uneven color and poor plasticization, and ensuring uniform color on the product surface.

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Abstract

The invention discloses a single-screw structure for mixing of a plastic extruder, and relates to the technical field of extruders. The screw rod comprises a screw rod body, a positioning ring and a machine barrel, a mixing section is arranged at the rear section of the screw body and is of a spiral structure formed by arranging a plurality of mixing teeth, a plurality of groups of mixing outer teeth are integrally fixed at the tail part of the screw body, a positioning ring is mounted at the tail part of the machine barrel, a plurality of groups of mixing inner teeth are arranged in an inner hole of the positioning ring, and the mixing inner teeth and the mixing outer teeth are arranged in a staggered manner in the axial direction. The outer wall of the screw body is in clearance fit with an inner hole of the positioning ring. According to the single-screw structure for mixing of the plastic extruder, plastic melt glue enters the positioning ring after being uniformly stirred by the mixing teeth through the mixing section, and the melt glue is fully mixed at the positioning ring through relative movement of the mixing outer teeth and the mixing inner teeth, so that color masterbatch in the melt glue and raw materials are fully mixed and scattered.
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