发明名称 |
Open loop pressure control for injection molding |
摘要 |
An injection molding system is disclosed having a self-regulating valve for balancing melt flow. The self-regulating valve includes a control rod configured to balance the melt flow rate through a hot runner system. The self-regulating valve reacts to an injection or melt pressure within the hot runner system and a pre-set force provided by an external force device. The self-regulating valve is an open-loop system as it requires neither a measurement of pressure by a sensor nor feedback from a processor in order to regulate the melt flow. The self-regulating valve mechanically reacts to changes in melt pressure on control surfaces thereof by "bobbing" upwards/downwards to decrease/increase the melt flow accordingly. The self-regulating valve compensates for conditions that affect melt pressure, such as an increase/decrease in melt viscosity, changes in melt temperature, and/or mold cavity size without the use of a processing device.
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申请公布号 |
EP1867457(A2) |
申请公布日期 |
2007.12.19 |
申请号 |
EP20070011774 |
申请日期 |
2007.06.15 |
申请人 |
MOLD-MASTERS (2007) LIMITED |
发明人 |
DEWAR, NEIL;KUDCHADKAR, VIJAY;KLOBUCAR, PETER |
分类号 |
B29C45/28;B29C45/30 |
主分类号 |
B29C45/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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