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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

Mold Sticking of PE Injection Molded Products (Soft Material)

A

Soft PE demolding = the four-piece set of 'draft angle + polishing + ejection area + cooling': the softer the material, the more 'gentle' demolding must be; any concentrated force will leave permanent deformation.

Extrusion & Post PE；LDPE；mold sticking；draft angle；ejection

Q

Rapid Screen Pack Blockage in PE Extrusion

A

If the PE screen pack blocks quickly, first distinguish 'impurities' from 'gel': impurities rely on material source management, gel relies on shutdown and dead-spot management; the screen pack is a consumable and, more importantly, a diagnostic window.

Extrusion & Post PE；extrusion；screen pack；blockage；gel；impurity

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

Flash at the Thread of PE Bottle Necks

A

Neck flash = a signal of 'mold fit wear': regularly replacing the cutting edge and wear parts is more economical than post-trimming; the neck precision of sealing parts directly determines whether the cap can lock.

Molds & Tooling PE；'2079851475616104457；bottle neck；flash；mold wear；sealing

Q

Wall Thickness Deviation of PE Hollow Containers

A

Blow-molded container wall thickness = 'parison programming + sag control': the wall thickness program is the lifeline curve of '2079851475616104457; only combined with sag control can material be distributed where it should be thick.

Blow Molding PE；'2079851475616104457；wall thickness deviation；parison programming；stacking

Q

Die Pressure Fluctuation in PE Extrusion

A

Trace PE die pressure fluctuation in the order of 'material → screw → screen → temperature': pressure is a comprehensive indicator of extrusion system health; if fluctuation persists, don't expect stable products — stabilize the pressure first.

Extrusion & Post PE；extrusion；pressure fluctuation；feeding；screen pack；melt pump

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All Topics 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