Micro-foaming injection-molded screw

An injection molding and micro-foaming technology, applied in the field of injection molding screw, can solve problems such as insufficient mixing and homogenization ability, and achieve the effects of increasing mixing and homogenizing ability, stable pressure and speed, and avoiding the countercurrent flow of the melt to block the air passage.

CN102205609BActive Publication Date: 2013-07-17BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-07-17

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Abstract

The invention discloses a micro-foaming injection-molded screw, which mainly comprises a rear screw, a rear positioning ring, a rear non-return ring, a rear mixing section, a front mixing section, a front screw, a front positioning ring, a front non-return ring, and a screw head; the rear mixing section and the front mixing section has skewed slot barriers; a left and a right ends of the mixing sections are provided alternately with four charging troughs and discharging troughs; ribs between the charging and discharging skewed slots have a length less than the diameter of the mixing sections;the rear mixing section adopts a positive skewed slot with the same rotation direction as the screw, and the front mixing section adopts a reverse skewed slot. The screw has greatly improved mixing homogenization effect, and allows supercritical gas to distribute rapidly and uniformly in polymer melt so as to form a stable polymer melt / supercritical gas homogeneous system; meanwhile, a non-return ring is used at the air-inlet position, which can effectively prevent the obstruction of the air-inlet channel due to melt reflux; the novel micro-foamed injection-molded screw is widely applicableto various micro-foaming injection machines.
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Description

technical field

[0001] The invention relates to an injection molding screw, in particular to a screw suitable for microfoaming injection molding. Background technique

[0002] Micro-foaming injection molding technology is a new green injection molding technology developed in the 1980s. By introducing a supercritical gas foaming agent into the melt, the fatigue life of the microcellular foamed plastic obtained can be extended by 5 times, and the fracture toughness It can be increased by nearly 4 times, and the impact strength can be increased by 6 to 7 times. This new type of processing technology has greatly improved the performance of the product, and is a very promising green plastic molding processing technology.

[0003] During the molding process, the main function of the screw is to melt and plasticize the solid raw material and transport the melt forward stably. In micro-foaming injection molding, the melt is filled with a supercritical gas foaming agent. The superc...

Examples

Embodiment Construction

[0017] like figure 1 As shown, a micro-foaming injection molding screw mainly consists of a rear screw 1, a rear positioning ring 2, a rear check ring 3, a rear mixing section 4, a front mixing section 5, a front screw 6, a front positioning ring 7, The front check ring 8 and the screw head 9 are composed; the tail of the rear screw 1 has a keyway, which is installed on the injection machine through the keyway and the key; the head of the rear screw 1 has a threaded hole, and the tail of the rear mixing section 4 has a rear The stepped shaft 11, the end of the rear stepped shaft 11 has a rear stepped shaft thread 12, the rear positioning ring 2 and the rear check ring 3 are sequentially set on the rear stepped shaft 11 of the rear mixing section 4, and the rear mixing section 4 passes through The rear stepped shaft 11 is connected to the rear screw 1; the head of the rear mixing section 4 has a front stepped shaft 14, the end of the front stepped shaft 14 has a front stepped s...