teknologi plastik

Flow lines can be defined as linear grooving, or circular ripples, on the surface of a molded part that indicate the direction of material flow within the cavity of the mold.MACHINE INADEQUATE INJECTION PRESSUREExplanation: If too little injection pressure is used, the molten plastic will tend to cool...

Excessive shrinkage can be defined as an extreme decrease in the  dimensions of a molded part after it has cooled to room temperature.MACHINE BARREL TEMPERATURE TOO HIGH Explanation: If the barrel temperature is too high, the resin absorbs an excessive amount of heat and this increases the size of the voided...