The plastic injection
temperature is usually high. Injecting with air
will burn the plastic since the oxygen in the
air is flammable, which would be more obvious
for transparent plastic parts. Therefore, injection
molding machine uses nitrogen since it is not
flammable.
Accumulator assist injection molding machine
must be installed with a set of gas assist injection
equipment, including:
- Nitrogen producing machine or nitrogen bottles
(grade nitrogen purity to 99%).
- High-pressure nitrogen compressor and for
a little quantity production can use pressurized
cylinder mode.
- High-pressure gas cylinders (for bigger quantity
production use).
- Gas assisted controller (it have single loop
circuit and multi loop circuit two type).
Accumulator assist injection molding machine
is specialized in avoiding sink mark, warping,
flow line mark, reduce product weight (up to 50%
depending on product condition), product cost,
molding cycling time (up to 30% depending on product
condition), increasing production efficiency,
and internal force.
Gas-assisted injection molding flow chart:
The above diagram explains that the nitrogen can
be injected when either the injection complete
or incomplete. The machine uses gas assist injection
controller unit to control nitrogen pressure and
time to achieve the pressure holding performance,
then open the mold to take out the product after
gas went out.
Accumulator assist injection molding machine
has been used to make television frame, car handle,
steering wheel, and home products like chair,
table, handle, clothe hanger..., etc. |