BMC Parts Flame Retardant, Beautiful, Durable

Characteristics and Applications of BMC Parts

The BMC Parts has good physical, electrical and mechanical properties, therefore, it is widely used, such as the production of gearbox components, intake pipe, gas valve cover, bumper and other mechanical parts, in the requirements of seismic, flame-retardant, beautiful, durable aviation, construction, furniture and other aspects are also widely used; In its traditional electrical field, Its use is also more and more extensive.

1) Feeding System

Whether screw or plunger type, must be attached to a squeeze-type feeding device to force the material into the material cylinder, the feeding device is mostly plunger-type plus-press feed.

2 Injection system

Because the injection of plunger injection molding machine is accurate and constant, so that glass fiber less damage to disperse in the melt, so the plunger type injection molding machine use more, but the exhaust is inconvenient.

3 Heating System

In the BMC Parts injection molding, the control of barrel temperature is very important, must have a control system control temperature, to ensure that the feeding section to the nozzle temperature is the best. At present, the use of constant temperature water or constant temperature oil heating. Electric heating can also be used.

4) Clamping Device

The use of mechanical, hydraulic and full hydraulic type of several clamping devices.

5) Mould

BMC Parts injection molding is somewhat different from the usual thermoplastic and thermosetting injection molding, which is mainly due to the low shrinkage of the BMC Parts and therefore should be changed in the design of the cavity size.

1. Barrel Temperature and die temperature

During the injection molding process, the BMC Parts is required to keep the flow state of low viscosity for a long time under the barrel temperature, and the general barrel temperature should be able to meet the BMC Parts's low limit value. The barrel temperature is generally divided into two or three-stage control, near the lower end of the hopper, near the nozzle end temperature is higher. General difference 20-60c, mold temperature is generally controlled in 135~185c;

2 Injection pressure

Because the BMC Parts's fluidity is poor, curing is fast, the mold structure is complex, so the injection pressure should choose higher pressure, general is 80~16ompao

3 Injection Speed

The increase of injection speed can improve the surface quality of plastic parts and shorten the curing time, but it is not conducive to exhaust and increase the orientation of fiberglass. -therefore, the lower injection speed should be adopted under the precondition of guaranteeing the surface quality of plastic parts, usually 1. $number 5m/min.

4 screw speed and back pressure

If the screw-type injection molding machine, in the injection BMC Parts, screw on the glass fiber damage, in order to minimize the damage of glass fiber, screw speed should be selected low value, generally 20~5or/min. According to the BMC Parts viscosity, the use of low back pressure is advisable, generally 1. $number. 0MPa.

5) Molding Cycle

Because of the size and complexity of the plastic parts, the process time is different, the general injection time for 2~20s, insulation time for 10-20s/mm (thickness).