There are thick and
thin wall injection products. For thick wall products,
the injection speed must be slow, while for thin
wall products, the injection speed must be fast.
Also, the injection pressure must be low for thin
wall products since it would warp the thin wall
products if the internal pressure gets too high.
Yet, some products require high pressure and low
speed injection controlling, which is opposite
to the thin wall products. To satisfy this condition,
using the two set double cylinder injection system
which controls high, normal, and low speed injection
can solve the problem.
For two set double cylinder injection system:
- When using high speed injection, the injection
speed increases to above 200mm/sec. With this
high speed and low pressure injection, it can
reduce internal force and prevent warping for
thin wall products or slow flows material.
- When using normal speed and pressure injection,
injection performance is good for general production.
- When using low speed and high pressure injection,
it is better for thick wall products, especially
for high holding pressure and long holding time
products. Thick wall products must use larger
barrel to inject in order to avoid injection
pressure gets too low and causes product shrinkage.
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