Problem & Solution

Practical answers to common plastic material challenges

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Q

HDPE Film Bubble Instability

A

Film bubble stability relies on melt strength and uniform airflow; 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

Extrusion & Post HDPEfilm bubblemelt strengthair ring

Q

HDPE Die Buildup

A

Die buildup is controlled by cleaning and PPA; 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

Extrusion & Post HDPEdie buildupprecipitationPPA

Q

HDPE Processing Aid PPA

A

PPA is the key additive for HDPE to achieve both high speed and high quality; dosage strategy and onset time management are application essentials; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE;PPA;fluoroelastomer;wall slip;dosage

Q

HDPE Melt Fracture

A

Melt fracture is treated by reducing speed, increasing temperature, and adding PPA; 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...

Extrusion & Post HDPEmelt fracturesharkskinPPA

Q

HDPE Melt Fracture Sharkskin

A

Sharkskin is a shear critical phenomenon in HDPE extrusion; reducing speed, increasing mold temperature, and adding PPA work together; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE;melt fracture;sharkskin;shear rate;PPA

Q

HDPE Anisotropy

A

Anisotropy is controlled by flow symmetry and mold flow prediction; 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 HDPEanisotropyshrinkagemold flow

Q

HDPE Shrinkage 1.5-4%

A

HDPE's high shrinkage is its crystallization nature; mold shrinkage allowance plus wall thickness uniformity plus holding pressure compensation are the three key measures for dimensional control; after confirming effectiveness, solidify the parameters and practices into the work instruction to pr...

Molding Process HDPE;shrinkage;1.5-4%;crystallization;holding pressure

Q

HDPE Double-wall Corrugated Pipe

A

Corrugated pipe interlayer welding relies on parameters and monitoring; 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

Extrusion & Post HDPEcorrugated pipeweldingdelamination

Q

HDPE Glass Fiber Reinforced Part

A

Warpage of reinforced HDPE is controlled by design and mold flow; 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 HDPEglass fiberwarpagemold flow

Q

HDPE Molecular Weight Selection

A

HDPE grades are matched to process and strength by melt index; 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 HDPEmolecular weightmelt indexmaterial selection

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