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Q

Flow Marks and Ripples on the Surface of PE Injection Molded Products

A

PE flow marks and ripples = a 'front management' problem: stabilize speed, maintain temperature, and enlarge the gate — the three axes; what it reflects is filling stability, which cannot be covered up by surface treatment.

Injection Molding PE；flow mark；ripple；front；speed profile；mold temperature

Q

Low-Temperature Brittle Cracking of PE Products

A

PE low-temperature brittle cracking = double insurance of 'grade + structure': HDPE in particular requires vigilance against low-temperature notch sensitivity; passing at room temperature does not mean passing at low temperature — verification must simulate the real use temperature.

Material Analysis PE；HDPE；low temperature；brittle cracking；notch sensitivity；grade

Q

Warpage of HDPE '2079851475616104452 (Orientation Type)

A

HDPE orientation-type warpage must be solved through gate and orientation analysis, rather than forcibly suppressing it with cooling; once the warpage direction of a highly crystalline material is fixed, it is time to go back and review the gate design.

Injection Molding HDPE；warpage；orientation；gate；crystallization

Q

Uneven and Fluctuating Melt Temperature in PE '2079851475616104452

A

PE melt quality = 'uniformity + temperature control': back pressure and screw mixing determine uniformity, and shear heat determines the actual temperature; the set temperature does not equal the melt temperature — actual measurement is the truth.

Injection Molding PE；melt temperature；back pressure；mixing；shear heat

Q

Yellowing and Black Specks in PE Injection Molded Products

A

PE yellowing and black specks = 'excessive heat history + dead spot carbonization': lower temperature and shorten time to prevent yellowing, purge the machine and check material to prevent black specks; for intermittent black specks, focus on checking equipment dead spots instead of repeatedly fi...

Injection Molding PE；yellowing；black speck；thermal degradation；carbonization；dead spot

Q

Internal Bubbles in PE Injection Molded Products

A

PE bubbles are divided into 'vacuum bubbles' and 'gas-containing bubbles': vacuum bubbles rely on shrinkage compensation, gas-containing bubbles rely on venting and volatile control; the fundamental way to prevent bubbles in thick-wall PE parts is still structural material reduction plus adequate...

Injection Molding PE；bubble；vacuum bubble；holding pressure；regrind；venting

Q

Large and Unstable Dimensional Shrinkage in PE '2079851475616104452

A

PE dimensions = 'high shrinkage + aging': correct the mold based on actual measurement by wall thickness, unify the measurement time point, and use holding pressure to compensate shrinkage; HDPE 'shrinks more' than LDPE, so the shrinkage difference must be factored in when selecting the material.

Injection Molding PE；HDPE；shrinkage rate；dimensions；holding pressure；aging

Q

Ejection Whitening and Mold Sticking in PE '2079851475616104452

A

PE ejection whitening and mold sticking = 'large clamping force + concentrated ejection + insufficient cooling': first extend cooling, then distribute ejection, and finally reduce holding pressure; for soft PE, especially guard against 'stretching deformation upon ejection'.

Extrusion & Post PE；ejection whitening；mold sticking；clamping force；ejection；cooling

Q

Delamination of PE Film Lamination

A

For PE lamination delamination, first check 'slip agent migration' — this is the most hidden and most commonly overlooked culprit; corona, cleaning, adhesive mixing, and curing are interlinked, and loss of control in any link will cause delamination.

Material Drying PE；film；lamination；delamination；slip agent；corona

Q

Static Electricity and Poor Print Adhesion of PE Film

A

Static electricity of PE film relies on 'elimination + grounding + humidification', and print adhesion relies on 'dyne value + aging time'; corona treatment decays over time, and printing as soon as possible after treatment is an iron rule of the industry.

Material Drying PE；film；static electricity；corona；dyne value；print adhesion

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전체 주제 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382