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Troubleshooting Guide – Linear Polyethylene Problem Possible Cause Suggested Remedy 7. Bubbles on parting Line During the first stage of cooling, there will be a rush of air into the part to fill the resultant partial vacuum. If there is inadequate venting, air will enter molten resin at the parting line and become trapped as the part wall solidifies • • • • Vent the mold to atmosphere pressure. Bubble Parting line Poor mold parting line • • Remate the parting line and adjust mold clamp pressure evenly. Relocate the vent to middle of mold. Use glass wool in vent. Use Teflon rather than metal as the material of construction for the vent tube. Clean the mold flange to prevent gapping and apply new mold release on flange. 20PDF Image | Troubleshooting your rotomolding operation
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