Water needle applied for water shaping production

Abstract

The invention discloses a water needle applicable to water-assisted molding production, which comprises a needle sleeve, a core rod internally arranged in the needle sleeve, springs, a spacing ring and sealing elements. A water inlet and a water outlet are opened on the needle sleeve, a through hole which supports the middle of the spacing ring is an air inlet, and a slender through hole opened inside the core rod forms a gas passage. The water needle is connected into one end of a die cavity, the core rod and the end portion of the needle sleeve are engaged to seal a passage of water to the die cavity, the core rod opens a water entry or a drainage passage under the driving of the springs and the water intake pressure or gas intake pressure, and the engagement of the end portion and the reasonable size arrangement of the small air hole of the core rod prevent plastic melt inside the die cavity from entering the water needle. The invention realizes the zero leakage of the water and gas through the direct sealing of the needle sleeve and die and the direct sealing of the core rod and the needle sleeve. The invention is capable of fulfilling all the water supply and drainage of water intake, gas intake and water draining which are required in the water-assisted molding technique, and has the advantages of compact and simple structure and easy standardization. The invention used in the water-assisted molding production is a crucial arrangement of water-assisted molding technique.

Description

technical field [0001] The invention relates to a plastic hollow injection molding production system, in particular to a water needle used in water-assisted molding production. Background technique [0002] In the field of injection molding industry, water-assisted injection molding technology is a new technology developed in recent years, which belongs to fluid-assisted injection molding technology as well as gas-assisted injection molding technology. Compared with the more mature gas-assisted injection molding technology after more than ten years of development, water-assisted molding technology is still in its infancy, but water medium has the advantages of incompressibility, high thermal conductivity, and high specific heat capacity compared with gas, which makes water-assisted molding Compared with gas-assisted molding, molding has the advantages of shorter cooling time and molding cycle, higher product quality (smooth inner surface, uniform thickness, etc.), lower prod...

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Problems solved by technology

In the world, there is no patent or related research report on a compact water needle that integrates water intake, air intake and drainage.

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