A plastic mold with a secondary ejection structure

By designing a plastic mold with a secondary ejection structure, efficient integrated molding and demolding of the screw post's internal thread were achieved, solving the problems of demolding and thread processing in traditional molds, and improving production efficiency and quality stability.

CN122165596APending Publication Date: 2026-06-09SICHUAN FEIERDA PLASTIC TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN FEIERDA PLASTIC TECH CO LTD
Filing Date
2026-05-09
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing injection molds, when processing plastic products with deep cylindrical shells, internal snap-fit, easy sticking, and poor rigidity, have high demolding resistance, which easily leads to defects such as tearing, whitening, cracking, jamming, and deformation. At the same time, the internal threads of the screw pillars cannot be integrally injection molded, requiring manual tapping, resulting in low production efficiency and unstable quality.

Method used

Design a plastic mold with a secondary ejection structure, including a fixed mold plate, a moving mold plate, an outer sleeve, a core column, and an ejection assembly. The rotation of the core column realizes the integrated molding of the internal thread of the screw column, and the temperature of the outer sleeve is dynamically adjusted by a temperature regulating element to control the static friction force. The threaded tube and the drive assembly work together to ensure smooth demolding.

Benefits of technology

It achieves efficient integrated molding of the internal thread of the screw post, reduces the risk of demolding torsion deformation, improves production efficiency and yield, and reduces reliance on manual operation and quality issues.

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Abstract

This invention relates to the field of injection mold technology, and in particular to a plastic mold with a secondary ejection structure, comprising a fixed mold plate, a movable mold plate, an outer sleeve, and a core pillar. The movable mold plate can move closer to or further away from the fixed mold plate along a first direction to close or open the mold. It should be noted that the first direction is the left-right direction as shown in the figure, and there are multiple outer sleeves. This invention features an outer sleeve, and the outer circumferential surface of the injection-molded core is in contact with the inner circumferential surface of the outer sleeve. Therefore, during the process of the core pillar rotating and moving out from the inner circumferential surface of the core pillar, the adhesive force (i.e., the static friction between the two) between the inner circumferential surface of the outer sleeve and the outer circumferential surface of the core pillar can generate a reverse resisting torque on the core pillar, thereby reducing the net torque value experienced by the core pillar. This reduces the risk of torsional deformation, stress whitening, or even breakage of the core pillar, thus improving the yield of injection-molded parts.
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