Hot nozzle assembly and hot runner system

Abstract

The invention discloses a hot nozzle assembly and a hot runner system. The hot nozzle assembly comprises a hot nozzle body and a nozzle tip arranged at the end part of the hot nozzle body, wherein a runner body is formed inside the hot nozzle body and the nozzle tip in a penetrating mode, a pressing part is arranged outside the nozzle tip in a sleeved mode, an inner cavity is formed in the inner side of the pressing part, a heat insulation sealing cap is arranged in the inner cavity, a through channel is formed inside the heat insulation sealing cap, and the nozzle tip is inserted into the through channel; a discharge port is formed in the end part of the nozzle tip, and a material injection channel is arranged in the pressing part; the runner body,and the discharge port communicate with the material injection channel, the inner wall of the pressing part and the outer wall of the nozzle tip are both tightly attached to the heat insulation sealing cap. The hot nozzle assembly avoids excessive internal material residue of an interior part, so that the cooling speed is increased, and the wire drawing phenomenon is avoided; and in addition, due to the reasonable internal structure, excess materials are prevented from entering between the nozzle tip and the pressing part, so that the residual material can be prevented from remaining in the interior and gradually becomes yellow, theproblem that the yellowing excess materials enter a product is avoided, and the product quality is improved.

Description

technical field [0001] The invention relates to a hot nozzle assembly, in particular to a hot runner system with the hot nozzle assembly. Background technique [0002] At present, the injection molds commonly used in the injection molding industry are hot runner injection molds. Compared with ordinary molds, the plastic products injected through the hot runner system are of higher quality, and the hot runner system has the advantages of saving raw materials, improving production efficiency, and high degree of automation. [0003] The hot nozzle assembly is an indispensable part of the hot runner system. After the hot nozzle assembly is discharged, the external material is cooled, and a part of the material remaining in the hot nozzle assembly has a high temperature. There are several problems with the residual material: [0004] 1. The internal material is in a liquid state due to its high temperature, while the externally injected material cools faster and becomes solid. Wh...

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Problems solved by technology

[0004] 1. The internal material is in a liquid state due to its high temperature, while the externally injected material cools faster and becomes solid. When the gate is separated from the mold, it will form a wire drawing, which will compromise the product quality;

[0005] 2. When assembling the tip of the nozzle and the pressing part, due to the needs of assembly and the reason of production cost control, there will be a certain gap left on the mating surface of the two assemblies. The two are gap fit and remain in the hot nozzle assembly If the material enters the gap, it will turn yellow after a long time. In the next injection molding, the yellow material will enter the mold, which also reduces the quality of the product.

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