Polyacetal (POM) POM called "Race of
steel", is a crystalline plastic, main properties are as follows:
1 POM is white plastic and shiny.
2 has good mechanical properties, hardness,
high stiffness, good impact resistance and has excellent abrasion resistance
and self-lubricating properties.
3 good resistance to organic solvents,
stable performance.
4 after forming size is relatively stable,
less affected by humidity. POM molding process to understand
1 POM small (smaller absorption rate
<0.5%) moisture, generally does not dry before molding or short dry.
2 molding temperature range is narrow, poor
thermal stability above 250 ℃ decomposition of formaldehyde monomer (melt darken) it alone to
raise the temperature to improve liquidity and no harmful effect. Normal beer
plastic feeding tube should adopt a lower temperature and a shorter residence
time and increase the injection pressure can improve mobility and the quality
of the product surface melt (melt flow rate of shear sensitive) temperature
parameters: Before feeding tube 190-210 ℃, the feeding tube
180-205 ℃, after feeding tube 150-175 ℃ pressure parameters:
the injection pressure is about 100Mpa, back pressure 0.5Mpa.
3 mold temperature control at 80-100 ℃ is
appropriate (usually run hot oil)
4. POM cooling shrinkage large (2 to 2.5%)
prone beer plastic "shrink", it must be used to extend the holding
time to feeding.
more information www.chinamoldmaker.org www.plastic-injectionmoulding.com
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