Bakelite is a kind of thermosetting plastic, its basic composition is phenolic resin. The molding progress including: put the raw material into injection molding machine barrel, heating the barrel and at the same time machine screw rotating, make the raw material plasticized into molten state, then under the push force of the screw, the raw material inject into the mould cavity. Bakelite will have cross-linking reaction, finally solidification. After the product molded, we open the mould and ejector the product.
Bakelite injection molding is basically the same as injection molding of other raw materials. The bakelite powder is melt-plasticized by screw to make it into a molten state and has fluidity. Then, the bakelite melt is injected into the mold cavity by the propulsion system, and cooled by cooling. After that, it becomes the final product. The general process points are as follows:
1. The temperature control of the barrel generally adopts multi-stage temperature control mode.
A, two sections of temperature control: the front section 90-95 ° C, the latter section 75-85 ° C;
B, three sections of temperature control: the front section 90-100 ° C, the middle section 80-90 ° C, the latter section 70-80 ° C;
C. If it is injection molding of complex workpieces, adjust the plasticizing temperature according to the specific conditions and injection cycle;
2, back pressure control
The
injection pressure of bakelite is generally between 3-5 kb/cm2, and it
can be produced according to different products and product structures
by selecting appropriate pressure. The bakelite is converted into a
fluid state by plasticization, and the fluid is injected into the cavity
by using a suitable back pressure. Since the fluidity of the bakelite
melt is good, there is no special requirement for the injection back
pressure, and a uniform and stable injection is maintained. The pressure
is enough.
3, injection speed
The
injection speed of bakelite is mainly at medium speed. Due to good
fluidity, Bakelite injection does not require a particularly high
injection pressure, and can be pressed at a pressure of about 60 kg. Use
medium-speed injection, the flow rate of 10-25 grams per second can be,
if the injection speed is too fast, it will cause friction and heat
generation of the bakelite melt and nozzles, runners, gates, cavities,
etc., causing melting If the temperature of the material is too high,
decomposition and bubble generation will occur; if the temperature is
too slow, the production efficiency will be affected, and the melt will
remain in the barrel for too long and cause unnecessary loss.
4, mold temperature control
Bakelite has a faster forming speed. When the mold temperature drops below 70 °C, it begins to form. It is usually molded at a mold temperature of 40 ° C. The period of molding is related to the wall thickness of the product, with a period of 14 seconds per mm thickness. Set up, the general product curing cycle can be between 50-80 seconds.
Odin Mold Company can provide all kinds of Bakelite ranging from home appliance, lamp holder, socket switch, car machinery to kitchen ware. We can offer one-stop service system for our customers: product design, mould design, molding, surface treatment and high quality after sale service.
Product design, mould design and mould processing are the
key to produce high quality Bakelite. However, to produce the Bakelite,
it must be equipped with advanced technology.
Welcome to buy the high quality electronics parts bakelite plastic handle injection mold made in China with our professional manufacturers in China. We are equipped with a productive factory at your service which also satisfies your customized requirement.
