The application process of injecting bakelite powder can be controlled according to its performance characteristics, improve the finished product rate, reduce the working load of the injection machine, reduce the wear on the screw barrel, shorten the molding cycle, and improve the appearance of the workpiece‘s help. Reasonable use of injection bakelite can extend the service life of general nitriding steel screws to 8-12 months and improve damage to the mold.
First, the concept:
The material must be sufficiently
melt-plasticized in the barrel by the screw under appropriate
temperature conditions to give it a good melt state and fluidity, so
that it has the best injection molding process. Injectable bakelite
powder has good thermal stability of the barrel. It can be kept in the
barrel for more than 10 minutes at 120 °C, and it has the best melt flow
state at 85-100 °C. The barrel retention time can reach 20 minutes.
Second, it is recommended to set the conditions of the barrel temperature:
Third, the relationship between back pressure:
Fourth, pressure and injection (shot) speed:
Since the material has sufficient melt flowability, the cavity can be filled without requiring a high injection pressure, and the load on the machine tool can be greatly reduced and reduced, and the injection molding requirement can be generally satisfied at about 60 kg. Rapid rubbing of shots and nozzles, runners, gates, molds can create excessive temperatures and exacerbate wear on the screw barrel. Especially for the injection machine controlled by single proportional valve, the high pressure and high speed damage to the screw mold is more serious, so the injection speed should not be too fast. Too slow will affect efficiency and is not desirable. Generally, depending on the size of the part and the gate form, it is controlled at 10-25 grams per second. It is better not to inject the hard foam and gas against the workpiece.
You can send any of kind above drawing or samples data to us ask quote
Our company can customized plastic parts for customer,possesses advanced Injection Molding Machines，such as 1250T, 780T, 450T, 360T, 250T, 160T, etc in injection molding.
It also comes with one gas-assisted injection equipment, which can produce roof handle products such as hollow.
For mold spare parts, such as springs, thimbles, hot runner accessories, etc., our company will provide customer maintenance and use free of charge.
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