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Bakelite Injection Mould

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...

Description

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:

1. Two sections of temperature-controlled barrel: the first 90-95 ° C, the latter 75-85 ° C;
2. Three-stage temperature-controlled barrel: the first 90-100 ° C, the middle 80-90 ° C, the latter 70-80 ° C;
3. The fluidity of the material required for the compounding process can be adjusted by appropriately increasing or decreasing the temperature of the front barrel.



baklite injection


Third, the relationship between back pressure:

The injected bakelite powder is basically granular. In addition to the temperature required to melt it, the back pressure must be adjusted to complete and perfect the pre-plasticization of the material, so that the fluidity during the injection process is good, and the addition amount is uniform and stable.

The adjustment of the back pressure can generally control the proper flow of the nozzle when the feeding is loosened, and the feeding is stable during the injection process, depending on the machine, about 3-5 kg/cm2.



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.


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about us


  • Odin Mould(atplas) is a professional manufacture of gas-assisted injection mold, daily-use plastics mould, SMC/BMC mould, thin-wall injection mold, injection molding OEM,we have cultivated an excellent team and established a comprehensive system to meet different Different needs of customers.


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You can send any of kind above drawing or samples data to us ask quote

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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.

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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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