Blow Molding Troubleshooting Pdf

Blow air pressure too low. This book A Guide to Polyolefin Blow Molding contains general information concerning materials methods and equipment for producing high quality polyolefin blow molded products at optimum production rates.


Pdf Troubleshooting Guide For Blow Molding Problem Possible Causes Possible Solutions Anh Vo Academia Edu

2 Stretch Seal Unit consists of Stretch Cylinder Sealing Cylinder Sealing Head Stretch Bar.

Blow molding troubleshooting pdf. Reduce heat in weak areas especially the base. Troubleshooting Part Defects Preventive and Corrective Actions Scrap Regrind Rework Product Tracking tel. The clamping mold-plate will bring the mobile mold-plate to move backwards too to clamp the mold.

Increase blow air pressure. Right Mold Close Key Push to activate of right mold clamping action manually. Dry the mould cavities or reduce humidity in moulding room.

This strengthens these areas of the preform allowing more. Check for leakage around neck rings shear steel and blow pins. The Basics of Troubleshooting in Plastics Processing is a condensed practical guide that gives the reader a broad introduction to properties of thermoplastics plastics additives the major processes extrusion injection molding rotational molding blow molding and thermoforming as well as troubleshooting.

Most defects respond to one of a variety of process andor material changes. Push lamp 1 closer to the preform. Rough Surface on Bottle.

Z Low density polyethylene LDPE. Implement a quality assurance syste stearate is identifies any trends and allows for Develop and publish the quality standards change to become apparent record changes in Continued on Page 2 INTRODUCTION Injection blow molding incorporates particular characteristics and advantages over other. The two halves of the mold.

Applicable for simulating the stretch-blow moulding process of PET bottles and is capable of offering helpfu l knowledge in the pr oduction of bottles and the design of an optimum preform. Blow-out Blow-out of parison Increase land width of pinch-off. Blow-Moldable Polyolefins and Applications Polyolefins that can be blow molded include.

Troubleshooting Guide for Blow Molding Problem Possible Causes Possible Solutions 1. PET Stretch Blow Molding – Handbook of Troubleshooting Plastics Processes – Wiley Online Library. Parison sag – This causes a decrease in thickness of parison as it is being extruded.

Die swell – This causes an increase in thickness of parison as it is being extruded. 1 and 2 parison is pinches at the t op and sealed at the bottom around a metal blow pin as. Parison not being blown Defective blow timer clogged blow lines or too sharp pinch-offs Replace blow timer Clean blow lines Stone pinch-offs to create more pinch area Reset cushion Clean tooling 2.

Gradually reduce blow pressure to decrease inflation rate. Right Mold Open Key Push to activate of right mold opening action manually. Right Blowing Key Push to activate of right blowing action manually.

Move oven bank slightly lower. Extrusion blow moulding There are two flow related problems occurring in extrusion blow moulding these being. Increase clamp pressure.

Handbook of Troubleshooting Plastics Processes. Molding Troubleshooting Guide Bond Failure Failure of a bonded assembly usually at the interface of the adhesive and the substrate Probable Cause Material Out of spec SM Process Gel time of adhesive too short to permit proper bonding ond not fully cured before clamps are removed. Moisture condensation on moulds.

These two parameters influence the thickness and. Right Deflash Key Push to activate of. Close mold before full snapback of parison.

Slow mold closing speed. Plastic for blow molding. If that leads to overheating and haze increase fan cooling.

Mold Improper venting Section thickness too great Injection Molding Troubleshooting Guide Brittleness Contamination Bubbles cont Sources Causes Mold cont Improper runners or gates Mold temperature too low Material Excessive moisture Operator Inconsistent cycle Machine Excessive injection speed or pressure Excessive back pressure Screw speed too high. Summary This chapter contains sections titled. Parison not being blown Defective blow timer clogged blow lines or too sharp pinchoffs Replace blow timer Clean blow lines Stone pinch-offs to create more pinch area Reset cushion Clean tooling 2.

Use clamp pause on mold lock-up. Troubleshooting Guide for Blow Molding Problem Possible Causes Possible Solutions 1. Troubleshooting Tips for Injection Blow Molding used.

Push up the front back connect bar to make the clamping mold-plate move backwards. Increase cooling preferably in pinch-off area. Increase heat in zone 1.

Reduce preblow air andor increase blow delay time. Troubleshooting Guide for Injection Molding Troubleshooting is the art and science of remedying defects after the process has demonstrated the ability to produce acceptable production parts. Introduction The PET Universe Technology History PET Chemistry PET Morphology Bottle Universe Bottle Manufacturing.


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