Water-assisted injection molding and gas-assisted molding common nozzle

Abstract

A water-assisted injection molding and gas assisted molding common nozzle. A fifth leak proof ring (29) and a fourth copper sleeve (25) of the nozzle are fastened tightly; a third copper sleeve (14) and a fifth copper sleeve (29) are connected by pins; a third copper sleeve (14) and a first copper sleeve (26) are in meshed connection; a fourth leak proof ring (24) is installed in a step hole at the rear end of a nozzle body (8); the fourth leak proof ring (24) is pressed tightly by the fifth copper sleeve (29), the first copper sleeve (26) and the third copper sleeve (14); the nozzle body (8) and the second copper sleeve (21) are in threaded connection; and a front end of a second stage core rod (19) in the nozzle body (8) and the nozzle (8) are in clearance cooperation. The nozzle is applicable to injection molding, water-assisted or gas-assisted molding, and has good seal performance and adjustable pressure.

Description

technical field [0001] The invention relates to water-assisted forming and gas-assisted forming of a plastic forming mold, which is a common nozzle for water-assisted forming and gas-assisted forming. Background technique [0002] In the mold manufacturing industry, the principles of gas-assisted molding and water-assisted molding are the same, both to ensure high-quality products, to ensure that the outer surface of the product has no defects such as shrinkage and pores, to ensure that the outer and inner surfaces of the product are smooth, and at the same time A hollow product with extremely high strength can be obtained to achieve the purpose of saving raw materials. Gas-assisted molding principle: Gas-assisted injection molding is to inject high-pressure nitrogen directly into the mold cavity through the gas-assisted main controller (segmented pressure control system) to plasticize the inner layer of the plastic, so that the plastic part expands to form a vacuum, but sti...

AI Technical Summary

Problems solved by technology

7. Since the gas-assisted and water-assisted molding technology has just started in China, there will be many problems in the actual mold manufacturing, such as insufficient air pressure or water pressure in the molding process of the product, resulting in shrinkage and porosity defects in the product. Mold water leakage, air leakage and other problems

Another problem that arises is that it is difficult for gas or high-pressure water to pierce the thick part of the product to replenish pressure.

At the same time, the gap between the air needle and the mold is too large, the molten material is easy to enter the air needle gap, and the seal between the outer periphery of the air needle and the mold is not good, resulting in product sink marks and blown cracks

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