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Manifold system having flow control

A technology of injection molding and injection nozzle, applied in the field of improved injection molding hot runner system, which can solve the problems of low control precision of melt flow and so on

Inactive Publication Date: 2008-07-30
辛汶蒂夫成型方案股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pressure spikes detected by the sensor can cause undesired responses in the control system and result in less precise control of the melt flow than desired

Method used

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  • Manifold system having flow control
  • Manifold system having flow control
  • Manifold system having flow control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] Figures 1-2 show an embodiment of the injection molding system of the present invention. Injection molding system 1 is a multi-gate single-cavity system in which molten material 3 is injected into cavity 5 from gates 7 and 9 . Molten material 3 is injected into manifold 15 from injection molding machine 11 through elongated inlet 13 . The manifold 15 distributes the melt through channels 17 and 19 . While a hot runner system is shown in which a plastic melt may be injected, the invention is also applicable to other types of injection systems where the invention may be used to control the delivery of a material, such as a metal or composite, to a flow in one chamber.

[0042] The melt is distributed through channels 17 and 19 into holes 18 and 20 of nozzles 21 and 23, respectively. Melt is injected from nozzles 21 and 23 into mold cavity 5 (where the part is formed), which mold cavity is formed by mold plates 25 and 27 . Although a multi-gate single-cavity system is ...

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PUM

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Abstract

An injection molding apparatus and method are provided in which the rate of material flow during an injection cycle is controlled. According to one preferred embodiment, an injection molding apparatus is provided that includes a manifold (231), at least one injection nozzle (215) coupled to the manifold, an actuator, and a valve pin (200) adapted to reciprocate through the manifold and the injection nozzle. The valve pin (200) has a first end coupled to the actuator, a second end that closes the gate (211) in a forward position, and a control surface (205) intermediate said first and second ends for adjusting the rate of material flow during an injection cycle. Retracting the valve pin tends to decrease the rate of material flow during the injection cycle and displacing the valve pin toward the gate (211) tends to increase the rate of material flow during the injection cycle.

Description

[0001] This application is a divisional application of the patent application whose application number is 00815957.2 and the application date is September 21, 2000. technical field [0002] The present invention relates to the injection molding of pressurized material, such as molten plastic in a hot runner system, through a manifold. More specifically, the present invention relates to an improved injection molding hot runner system in which the flow rate of the molten stream through the gate during injection molding is controlled. Background technique [0003] US Patent No. 5,556,582 discloses a multi-gate single-cavity system in which the flow rate of the melt stream through each gate is independently controlled according to specific target process conditions using a control system. This system enables the selective positioning of a part's weld line (the part of the part where melt from one gate contacts melt from another gate). The system also enables the shape of the we...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76B29C45/30B29C45/27B29C45/28B29C45/77
CPCB29C2945/76006B29C45/766B29C2045/306B29C2945/76765B29C45/2701B29C2945/76849B29C45/2725B29C2945/7621B29C45/82B29C2945/76591B29C45/77B29C2945/76581B29C2945/76545B29C2945/76307B29C2045/2772B29C2945/76735B29C45/76B29C2945/76013B29C2945/76943B29C2045/2872B29C2045/2886B29C45/7686B29C45/2806B29C2045/2722B29C45/768B29C2945/76785B29C2945/76277B29C2945/76595B29C2945/76083B29C45/02B29C2045/304B29C2945/76498B29C2045/2882B29C45/30B29C2045/2687
Inventor D·卡兹梅尔M·D·莫斯M·多伊尔H·范吉尔
Owner 辛汶蒂夫成型方案股份有限公司