Sunday, October 18, 2009
Blush
Blush can be defined as a clouded discoloration normally found at gate locations, but they can be found anywhere on the part surface. These visually defective areas have very weak physical properties due to loose molecular structure.MACHINE EXCESSIVE INJECTION FILL SPEED Explanation: The speed and pressure...
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Labels:
blush,
ilp,
ilp jitra,
plastic,
plastic injection molds,
plastics,
plastik,
teknologi plastik,
trouble shooting
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Sunday, October 18, 2009
Contamination
Contamination can be defined as an imperfection in a molded part caused by the presence of a foreign object or material that is not part of the original molding compound.MACHINE OIL LEAKS AND GREASE DRIPS Explanation: It is common for most molders to allow small oil leaks to become big ones before they consider...
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Labels:
contamination,
ilp,
ilp jitra,
plastic,
plastic injection molds,
plastics,
plastik,
teknologi plastik,
trouble shooting
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Sunday, October 18, 2009
Jetting
Jetting can be defined as a ``snake-like'' pattern on the surface of a molded part, usually emanating from the gate area. It is indicative of an undesirable turbulence and splitting of the flow front.MACHINE EXCESSIVE INJECTION SPEED Explanation: Excessive injection speed (fill rate) will cause the molten...
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Labels:
ilp,
ilp jitra,
jetting,
plastic,
plastic injection molds,
plastics,
plastik,
teknologi plastik,
trouble shooting
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Sunday, October 18, 2009
Knit lines
Knit lines can be defined as the inability of two or more flow fronts to ``knit'' together, or "weld", during the molding process. This normally occurs around holes or obstructions and causes locally weak areas in the molded part.MACHINE LOW BARREL TEMPERATURE Explanation: When barrel temperatures are too...
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Labels:
ilp,
ilp jitra,
knit lines,
plastic,
plastic injection molds,
plastics,
plastik,
teknologi plastik,
trouble shooting
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Sunday, October 18, 2009
Sink Mark
A Sink Mark can be defined as a depression, resembling a dimple or groove, caused by excessive localized shrinking of the material after the part has cooled.MACHINE BARREL TEMPERATURE TOO HIGH Explanation: If the barrel temperature is too high, the resin absorbs an excessive amount of heat and this increases...
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Labels:
ilp,
ilp jitra,
plastic,
plastic injection molds,
plastics,
plastik,
sink mark,
teknologi plastik,
trouble shooting
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Sunday, October 18, 2009
Cracking and/or Crazing
Cracking and/or Crazing can be defined as a fracture or surface breakage in the material of a molded part, usually found in weld line areas, but also on the surface in general.MACHINE MOLDED-IN STRESSES Explanation: Although stress cannot be eliminated, excessive stress can be molded into the parts by using...
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Labels:
cracking,
crazing,
ilp,
ilp jitra,
plastic,
plastic injection molds,
plastics,
plastik,
teknologi plastik,
trouble shooting
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