Problem & Solution

Practical answers to common plastic material challenges

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Q

Uneven thickness of BOPP film

A

BOPP thickness uniformity is jointly determined by cast sheet quality and stretching consistency; online thickness measurement closed loop is the standard configuration of modern production lines.; after confirming effectiveness, solidify the parameters and practices into the work instruction to ...

Extrusion & Post PP; BOPP; uneven thickness; die head; stretching; thickness measurement

Q

Delamination of PP products overmolded with TPE/TPU

A

For PP overmolding delamination, grasp the three points of 'grade matching + interface temperature + differential shrinkage': the soft and hard rubbers must be bondable, the substrate must be preheated, and the mold must be designed for differential shrinkage—all three are indispensable.

Extrusion & Post PP; TPE; TPU; overmolding; delamination; differential shrinkage

Q

Thickness deviation of PP film (machine direction/transverse direction)

A

PP film thickness must be 'treated by direction': for MD check the stability of extrusion and haul-off, for TD check the symmetry of the die lip and temperature field; adjusting randomly without distinguishing directions often presses down one lump only for another to pop up.

Extrusion & Post PP; film; thickness deviation; MD; TD; die lip

Q

Melt fracture (sharkskin) in PP extrusion

A

The main line for PP extrusion surface roughness is 'reduce exit shear': use the four-piece set of raising temperature, reducing speed, polishing, and adding PPA in order; when pursuing output, especially find the critical balance point between speed and surface quality.

Extrusion & Post PP; extrusion; melt fracture; sharkskin; die temperature; PPA

Q

PP Sheet Die Lip Buildup

A

PP die lip buildup is an accumulation process of 'stagnation degradation': cleaning treats the symptom, while temperature-speed matching treats the root; the interval pattern of periodic streaks from buildup can back-calculate the buildup shedding cycle.

Extrusion & Post PP;extrusion;die lip buildup;mold deposit;stagnation;streak

Q

PP-R Pipe Extrusion Rough Surface

A

For rough surface, check temperature and raw material first.

Extrusion & Post PP-R;pipe;rough surface;temperature;raw material

Q

PP Film MD Thickness Deviation

A

For MD thickness variation, first stabilize extrusion output and haul-off.

Extrusion & Post PP;film;thickness deviation;MD;extrusion fluctuation

Q

PP Cast Film Gel Particle (Fisheye)

A

CPP gel particles must be distinguished into 'unplasticized' and 'contamination/crosslinking' types: the former relies on plasticization and screens, the latter on cleaning and dead-spot control; transparent film demands extremely high melt uniformity—plasticization and filtration must both be in...

Extrusion & Post PP;cast film;gel particle;fisheye;screen;plasticization

Q

PP Flat Filament Drawing Breakage

A

For PP flat filament breakage, first check the film's 'innate quality' (gel particles, impurities, thickness), then adjust drawing temperature and ratio; drawing amplifies film defects—if the film fails, it breaks no matter how you adjust afterward.

Extrusion & Post PP;flat filament;drawing;filament breakage;gel particle;draw ratio

Q

PP Pipe Extrusion Inner Wall Ripples

A

For inner wall ripples, check die head distribution and pressure stability.

Extrusion & Post PP-R;pipe;inner wall ripple;die head;sizing

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