Water-aid injection molding water needle

Abstract

The invention discloses a water-aid injection molding water needle, which comprises a die. The die is provided with a mounting hole, and a water needle is arranged in the mounting hole; the water needle comprises a water needle sleeve and a water needle core rod in the water needle sleeve; and a water inlet flow passage and a gas inlet flow passage are formed in the die, a water supply device is connected to the outside of the water inlet flow passage, and a gas supply device is connected to the outside of the gas inlet flow passage. The water-aid injection molding water needle is characterized in that a clearance is formed between the water needle sleeve and the water needle core rod and communicated with the gas inlet flow passage and a die cavity of the die, the middle part of the water needle sleeve is provided with a trough which is communicated with the water inlet flow passage, the tail part of the water needle sleeve is provided with a water inlet distributor, one end of the water inlet distributor is communicated with the trough, and the other end of the water inlet distributor is communicated with the die cavity of the die. The water needle system integrates water inlet, gas inlet and drainage; and the water needle has the advantages of simple structure, convenient manufacturing and machining operations, small volume and stable performance, can be applied to various dies, and can prevent water medium and plastic melt from overflowing, effectively drain water in a water passage and achieve the purpose of reasonably reclaiming water resources.

Description

technical field [0001] The invention relates to an injection molding production system for water-assisted processing of plastic products, in particular to a water needle for water-assisted injection molding. Background technique [0002] Water-assisted plastic injection molding technology is developed from gas-assisted injection molding technology in recent years. It is one of the latest injection molding technologies. The gas-assisted plastic injection molding technology uses nitrogen as the working medium to inject into the plastic melt Forming a cavity, the disadvantages of gas-assisted plastic injection molding technology are: first, due to the low heat transfer and heat capacity of the gas, the cooling effect is still not ideal; second, the production of parts with large geometric dimensions or inner cavities is still There are various defects and relatively large residual wall thickness; the third is that the control accuracy and repeatability are not good; the fourth ...

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Problems solved by technology

However, when gravity and evaporation are used to drain water, it is not easy to recycle water, which is not conducive to environmental protection and wastes water resources.

For example, patent application No. 20071014344342.42 discloses a water needle used in water-assisted molding production. Through direct sealing between the needle sleeve and the mold, the core rod and the needle sleeve, zero leakage of gas and water can be achieved, and the water needle can complete All the water supply and drainage functions of water intake, air intake and drainage required by water-assisted molding technology, but it has the following defects: First, the structure of the water needle core rod and the water needle sleeve is complicated, such as in the water needle core rod. It is made with stepped holes, which is troublesome to process and high in process cost; secondly, the core rod of the water needle relies on the spring to transmit the force, so that the mouth of the core rod of the water needle and the sleeve of the water needle is opened, so as to realize water intake and drainage, while the spring’s The performance is unstable and easy to fail; third, the water inlet channel and the drainage channel are two different channels, the structure is complicated, and the processing is troublesome; fourth, the entire water injection device is bulky and cannot be used for small molds, and the scope of application limited

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