Shanghai Daoqin Plastics Co., Ltd.

what is 喷射Jetting)?

喷射, also 叫喷射痕, 喷射流涎, is in products gate 处出现 65纫状 流线, more in mold is gate 时出现. plastics melt high speed nozzle, runner and gate and other narrow rear, 突然进入开放, versus for relatively wide rear, melt material material flow direction 如蛇一样 bending front 进, and mold surface rear speed cooling.

due to this separation material can and rear 续进入 type resin very good melt combined, in products upper formed obvious 喷流纹. in conditions lower, resin in stage/phase versus for relatively low temperature degree from nozzle in injection shot. type surface front, resin degree non large, therefore generate type flow. lower temperature degree relatively high melt 不断 进入 type 腔, most material material by pressure to mold in relatively deep 位置处, therefore lower upper 述 喷 flow marks. 如图

nozzle fault/failure analysis and troubleshooting methods

1） process conditions as 不当

its generate causes and product methods lower:

A nozzle local temperature degree high. 应适当 reduce nozzle temperature degree.
B熔 material temperature degree high. 应适当 reduce material temperature degree or shrink short cycle, and in nozzle inner 设置滤 material 网.
C material inner pressure high. 应适当 reduce injection pressure and decrease/reduce pressure time, shrink short injection time,
D nozzle large. use small nozzle, or use elastic 簧针阀式 nozzle and degree nozzle.
2） raw materials wet combined use requirements

molding raw materials water separation content high, 也会引起 nozzle 流涎. for 此, drying raw materials or use material drying device.

3） hot runner mold design combined 理

in hot runner mold in, is anti nozzle 流涎, 应设置 can 释放集流腔 in residual stress plant/unit.