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Q

Sink Marks of PE Injection Molded Products (Thick-Wall Type)

A

For PE thick-wall sink marks, 'structural material reduction first': solid thick blocks are a breeding ground for sink marks, and material reduction is more effective than piling on holding pressure; large thick blocks should be avoided at the design stage of thick-wall PE parts.

Injection Molding PE；sink mark；thick wall；material reduction；gate freeze-off

Q

Warpage of PE Injection Molded Products (Ejection-Induced)

A

PE ejection deformation = 'insufficient cooling + uneven ejection': ejecting only after thorough cooling and balanced ejection are the principles; deformation caused by ejection is often misjudged as warpage from uneven cooling — pay attention to the distinction.

Injection Molding PE；ejection deformation；cooling；ejector pin；warpage

Q

Deformation of PE Injection Molded Products After Packaging

A

PE 'packing hot parts = secondary deformation': packing only after thorough cooling is the bottom line, and load distribution by the liner is the guarantee; PE creeps greatly, so the temperature and pressure in the logistics stage must both be taken into consideration.

Injection Molding PE；deformation；packaging；creep；stacking

Q

Poor Surface Gloss of PE Injection Molded Products

A

PE gloss is greatly limited by the material itself: mold temperature and holding pressure determine the degree of surface replication, mold polishing determines the gloss ceiling, and the grade determines the gloss limit; therefore, to make high-gloss PE parts, first select the right grade, then ...

Injection Molding PE；gloss；replication；polishing；grade

Q

Metering Fluctuation of PE Injection Molded Products

A

For PE metering fluctuation, first check the two mechanical links of feeding and the check ring: cushion fluctuation is the most intuitive alarm and should be continuously monitored; metering stability is the prerequisite for all quality in PE '2079851475616104452 — if metering cannot be stabiliz...

Injection Molding PE；metering fluctuation；check ring；cushion；feeding

Q

Strength Decrease of PE Injection Molded Products

A

PE 'strength decrease with normal appearance' = a material history problem: regrind, heat history, and weld line position are the three major suspects; strength must be guaranteed by process data and sampling inspection, not by appearance alone.

Injection Molding PE；strength；regrind；degradation；weld line

Q

Color Fading/Color Difference of PE Injection Molded Products

A

For PE color difference, check 'dispersion + metering stability'; for fading, check 'heat resistance + light fastness': stabilize the variables of regrind proportion, melt temperature, and feeding metering, and more than half of the color difference sources are eliminated; outdoor parts must also...

Injection Molding PE；color difference；color masterbatch；heat resistance；light fastness；dispersion

Q

Short Shot of PE Injection Molded Products (Venting Type)

A

For repeated short shots at a fixed position in PE, check venting first rather than pressure: using the short shot method to locate the last filling point and opening vents at the correct position is the fundamental cure; pressure is not a panacea — if trapped air is not removed, the higher the p...

Injection Molding PE；short shot；venting；short shot method；last filling point

Q

Stress Whitening of PE Injection Molded Products

A

PE stress whitening is a clear alarm that 'the local area has yielded': distributing the forces concentrated at ejection, assembly, and structure can prevent it, with no need for concealment; it is also a free indicator for locating structural and assembly weak points — making good use of it can ...

Injection Molding PE；stress whitening；yielding；ejection；assembly

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

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