Causes The Metal Injection Screw To Slip_Screw,Barrel,Spare Parts

Causes The Metal Injection Screw To Slip

Author：SGT Source：SGT Date： 2019-11-13

Summary：

There are many reasons for the alloy screw to slip, such as the wear of the alloy screw and barrel is likely to cause the alloy screw to slip. The compression ratio design of the injection molding alloy screw, if the feeding section is too short, that is, the compression ratio is too small, the delivery amount is reduced and the alloy screw is slipped.

When the check valve (check valve) is not working properly, it may cause the alloy screw to slip. In addition, the alloy screw slip may be caused by the resin feed hopper. Uniform feeding of the hopper is often overlooked in injection molding. A square hopper equipped with a fast compression section (ie, abruptly tightened at the bottom) is suitable for processing uniform raw materials, but it is not suitable for processing recycled materials with a wide particle size distribution. This will affect the uniformity of the feed, which means that the alloy screw cannot deliver the melt evenly under the same pressure and will also cause slippage!

Influence of process parameters The low temperature in the rear section of the barrel is usually the cause of the slippage of the injection alloy screw. The barrel of the injection molding machine is divided into three sections. At the back of the feeding section, the material forms a thin layer of molten polymer during the heating and compression process. The molten film layer is attached to the barrel. Without this thin layer, the pellets are difficult to transport forward. The material in the feed section must be heated to a critical temperature to produce a critical molten film layer.

The material in the feed section must be heated to a critical temperature to produce a critical molten film layer. However, it is often the case that the residence time of the material in the barrel is too short to allow the polymer to reach this temperature. This can happen due to the small size of the equipment and the correspondingly small barrel and alloy screw. Too short a residence time may cause the polymer to melt or mix insufficiently, which may cause the alloy screw to slip or stop.

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