Problem & Solution

Practical answers to common plastic material challenges

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Q

HDPE Stress Cracking

A

HDPE stress cracking is selected and verified according to ESCR; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Processing Machinery HDPEESCRstress crackingmedium

Q

HDPE Burnt

A

HDPE burnt is treated as trapped gas venting; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Processing Machinery HDPEburnttrapped gasventing

Q

HDPE Sink Mark

A

HDPE sink marks rely on holding pressure and wall thickness design; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Processing Machinery HDPEsink markholding pressurewall thickness

Q

HDPE Shrinkage Out of Tolerance

A

HDPE dimensional management is based on measured shrinkage; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Molds & Tooling HDPEshrinkagedimensionSPC

Q

HDPE Mold Flow Analysis Application

A

Mold flow analysis is insurance for complex HDPE parts; upfront investment greatly reduces the number of mold repairs; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling HDPE;mold flow analysis;warpage;gate;mold trial

Q

HDPE First Article Verification

A

HDPE first article verification must account for time; only inspection after 24-hour stabilization gives data representing true dimensions; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling HDPE;first article verification;24 hours;shrinkage;dimension

Q

HDPE Demolding Deformation

A

Demolding deformation relies on cooling and balanced ejection; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Molds & Tooling HDPEdemoldingdeformationejection

Q

HDPE Flow Mark and Jetting

A

HDPE flow marks and jetting are two extremes of speed; medium speed plus gate optimization is the balanced solution; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Injection Molding HDPE;flow mark;jetting;injection speed;gate

Q

HDPE Bubble Vacuum Void

A

HDPE vacuum voids are hidden defects; no sink marks does not mean no problem, and strength sampling inspection is the safety net; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Drying HDPE;vacuum void;holding pressure;thick wall;hidden

Q

HDPE Stress Cracking ESCR

A

ESCR is the core indicator for HDPE applications; grade selection determines crack resistance life more than process adjustment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Material Analysis HDPE;ESCR;stress cracking;detergent;grade

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