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This booklet reviews some problems that may occur during blow molding operations. Although millions of objects are blow molded each year, blow molding is not a Comprehensive polyethylene blow moulding troubleshooting guide and tips available for all applications. Find solutions to your technical challenges. How to Solve Blow Molding Problems. This booklet reviews some problems that may occur during blow molding operations. Although millions of objects are blow Page 1 of 3. Troubleshooting Guide for Blow Molding. Problem. Possible Causes. Possible Solutions. 1. Parison not being blown. Defective blow timer, clogged. How to Solve Blow Molding Problems · 1. Poor mold surface Refinish a poor or worn mold surface. · 2. Plugged or inadequate vents Clean plugged or dirty vents,Troubleshooting Guide for Blow Molding Problem Possible Causes Possible Solutions 1. Parison not being Defective blow timer, clogged Replace blow timer Solution: Simply increase the time of “heat soak”. • Cause: If the heaters, thermocouples or controllers of Extrusion blow molding machine are defective, resin. BLOW MOLDING DEFECTS. Axial thickness variations in parison. Surface defects: Mottle, Extrusion Die Lines. Pinch-off scars, trimming.