Problem & Solution

Practical answers to common plastic material challenges

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Q

HDPE pipe plasticization temperature too high

A

Out-of-control plasticization temperature damages both appearance and mechanical properties; investigate along three paths of temperature setting, mold core cooling, and screw condition, with the measured melt temperature as the criterion.; after confirming effectiveness, fix the parameters and p...

Molds & Tooling HDPE; pipe; plasticization temperature; degradation; mold core; screw

Q

HDPE bottle mouth thread flash

A

Bottle mouth flash = a signal of mold fit wear.

Molds & Tooling HDPE; '2079851475616104457; bottle mouth; flash; mold wear

Q

HDPE pipe wall thickness unevenness

A

Wall thickness unevenness should be divided into two categories: uneven discharge and cooling pull-off; tightening mold bolts plus uniform cooling, combined with online thickness measurement, can stabilize the wall thickness distribution.; after confirming effectiveness, fix the parameters and pr...

Molds & Tooling HDPE; pipe; wall thickness; unevenness; mold; thickness measurement

Q

Incomplete crosslinking of EVA foaming

A

Crosslinking sufficiency determines the dimensional stability and performance of foamed products; the three elements of temperature, time, and accelerator work in synergy.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling EVA; foaming; crosslinking; vulcanization; accelerator; shrinkage

Q

EVA foaming mold temperature unevenness

A

Mold temperature uniformity is the hardware foundation of foaming consistency; regular heat distribution testing should be included in maintenance.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling EVA; foaming; mold temperature; heating channel; temperature control; testing

Q

EVA Foaming Surface Defects

A

Surface quality relies on the matching of mold condition and foaming parameters; the broken hole problem requires controlling the foaming rate.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling EVA; foaming; surface; pits; broken holes; release agent

Q

EVA Foaming Shrinkage Deformation

A

Foam shrinkage is related to the degree of crosslinking and cooling history; sufficient crosslinking plus slow cooling and setting is the standard countermeasure.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling EVA; foaming; shrinkage; crosslinking; cooling; setting

Q

EVA Foaming Uneven Expansion Ratio

A

Foaming ratio uniformity is determined by mold temperature consistency and crosslinking sufficiency; temperature control accuracy and additive batch management are the two handles.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling EVA; foaming; expansion ratio; mold temperature; crosslinking; foaming agent

Q

COC Surface Quality

A

Mold and process are the key to COC surface quality; inspection ensures consistency; standards ensure delivery.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling COC; surface quality; gloss; mold; process; standard

Q

COC Dimensional Accuracy

A

The low water absorption of COC dimensional accuracy is the foundation; equal emphasis on process and mold; monitoring ensures consistency.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling COC; dimensional accuracy; low water absorption; process; mold; SPC

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