How to check the ejection device of injection molding machine?
The pouring system of the multi-cavity mold consists of the main channel, the shunt channel, the gate and the cold material hole.
1. The mainstream way
To undertake a section of flow passage from injection molding machine nozzle to diverging channel.It and injection machine nozzle in the same axis line material in the main channel does not change the flow direction, the cross section of the main channel is usually conical or cylindrical.
2. Tap the
It is a channel between the main channel and the gate and is generally opened on the parting surface.In a multi - cavity in a middle shunt is essential, and in a single - cavity mold, generally used in multi - gate feed.The design of the diverging channel should minimize the pressure loss of the melt in the flow channel, avoid the melt temperature dropping too fast and reduce the volume of the flow channel as much as possible.
3. The gate
It refers to the narrow part of the cavity that leads the plastic into the cavity immediately following the end of the runner.The section size of other gate other than the main runner gate is much smaller than the section size of the runner and the length is very short.
4. Cold material point
Used to remove the front end of the feed flow.During the injection cycle, because of the contact between the nozzle and the low-temperature mold, a small section of low-temperature material is stored in the front of the nozzle.Began to injection, cold freely material flow in the front, if cold material into the cavity will cause of cold shut, welded seam on the plastic, or even a cold material blocking gate to feed.The cold material hole is usually located at the end of the main channel, and sometimes the end of the shunt channel is also equipped with the cold material hole.