Air Vent to Solve Plastic Product Defects

Abstract

The product from plastic has occurred many defects and caused more difficulties to the worker in the injection moulding manufacturing sectors. There are some of few samples of defected plastic product such as shot short, burn mark, flashing, warping, bubbles and et cetera. Air vent is the marking line was designed on the mould. This air vent line has constructed in the centre of the ejector rod. Air vent also invented at the block in the mould or suitable places. This airflow line will occur during, while or after setting up a new mould installation processes. The position and size of the airflow line will determine the analysis of flow rate for raw material. Other factors also counted such as working experience and trial and error concepts. If the injection time is lesser than the from recommended timing (S² > S¹), will cause the gases to emit from melting material will be trapped into the mould. This scenario will occur defects to the products. According to the journal papers, four (4) cases were practically addressed about plastic products defects. All study has presented and addresses cases, many benefits were obtained in terms of time and number of defected products. But this process only can be controlled if the mould maintenance and mould lifespan where repaired. Hence the cost of operation and the number of defected products is significantly decreased as well as increased the number of products.