teknologi plastik

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.MACHINEOIL LEAKS AND GREASE DRIPSExplanation: It is common for most molders to allow small oil leaks to become big ones before they consider...

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.MACHINELOW BARREL TEMPERATUREExplanation: When barrel temperatures are too...

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.MACHINEMOLDED-IN STRESSESExplanation: Although stress cannot be eliminated, excessive stress can be molded into the parts by using...

Non-fill can be defined as an incomplete molded part caused by insufficient material injected into the mold. Non-fill can be an extension of a flow line or knit line condition.MACHINEINSUFFICIENT MATERIAL IN HOPPERExplanation: The most common cause of non-fill is insufficient material being injected...

Bubbles can be defined as a voided area trapped within a molded plastic part.It differs from a blister in that there is no surface protrusion with a bubble.Bubbles are usually caused by trapped gases or air pockets, but can also be caused by differential shrinking.MACHINE LOW INJECTION PRESSURE OR HOLD...