A hot runner system with an eight-hole needle valve

By using a meandering structure adapted to the flow path and independent heating components in a multi-cavity hot runner system, the temperature gradient problem is solved, achieving uniform heating and stable flow of molten plastic, thereby improving product quality and production efficiency.

CN224426319UActive Publication Date: 2026-06-30NAIERYOU (DONGGUAN) MOLD PARTS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NAIERYOU (DONGGUAN) MOLD PARTS CO LTD
Filing Date
2025-07-24
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

The existence of temperature gradients in multi-cavity hot runner systems leads to differences in the flowability of molten plastic, affecting the dimensional accuracy and quality of the products. Furthermore, traditional heating methods are difficult to achieve precise heating, which cannot meet the molding requirements of high-quality multi-cavity products.

Method used

The first and second heating elements are respectively arranged on the upper and lower surfaces of the hot runner plate to form a meandering structure that adapts to the direction of the flow channel, heating and covering key parts. The main hot nozzle and the branch hot nozzle are targeted for heating through independent hot nozzle heating components to ensure heating uniformity.

Benefits of technology

It reduces local temperature deviations, improves the flow stability of molten plastic, enhances the molding quality and production continuity of products, and reduces mold maintenance costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses a hot runner system with an eight-hole needle valve, relating to the field of hot runner technology. It includes a hot runner plate, a main hot nozzle, eight branch hot nozzles, a first heating element, a second heating element, and a hot nozzle heating assembly. The hot runner plate internally forms a main flow channel, a primary branch flow channel, a secondary branch flow channel, and a tertiary branch flow channel connected sequentially. The main hot nozzle is connected to the main flow channel, and the eight branch hot nozzles are respectively connected to the tertiary branch flow channels. The first heating element is disposed on the upper and lower surfaces of the hot runner plate, and its shape is adapted to the orientation of the primary branch flow channel and at least some of the secondary branch flow channels, for heating the primary branch flow channel and associated secondary branch flow channels. The second heating element is disposed on the upper and lower surfaces of the hot runner plate, and its shape is adapted to the orientation of the tertiary branch flow channel and at least some of the secondary branch flow channels. This helps maintain stable flowability of molten plastic during transport.
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