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Although millions of objects are blow molded each year, blow molding is not a simple processing technique. Possible defects are many and various. This booklet can also be injection blow molded, without injection blow and extrusion blow molding equipment. sticking problems or resin degradation.BLOW MOLDING DEFECTS. Axial thickness variations in parison. Surface defects: Mottle, Extrusion Die Lines. Pinch-off scars, trimming. This booklet reviews some problems that may occur during blow molding operations. Possible defects are many and varied, such as Rocker Bottoms and oval BLOW MOULDING TROUBLESHOOTING GUIDE. Download Printable Version pdf. Problem, Possible causes, Possible solution. Bottle Blow-outs for Blow Molding Problem Possible Causes Possible Solutions 1. Parison not being Defective blow timer, clogged Replace blow timer blown blow lines, Download Citation | Blow Molding - Problems and Solutions | A description of equipment and processing for Industrial Blow Request Full-text Paper PDF. 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, Page 1 of 3. Troubleshooting Guide for Blow Molding. Problem. Possible Causes. Possible Solutions. 1. Parison not being blown. Defective blow timer, clogged.