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문제 및 해결책

일반적인 플라스틱 재료 문제에 대한 실질적인 답변

2239 질문
Q
PVA screw slipping
A
Screw slipping is caused by premature melting; lowering the feed section temperature is the key
Extrusion & Post PVAscrew slippingfeed section temperaturepremature meltingflight deepening
Q
Large PVA dimensional change with temperature
A
Dimensional temperature sensitivity is caused by a large thermal expansion coefficient; adding filler and annealing are the key
Extrusion & Post PVAdimensional temperature sensitivitythermal expansion coefficientrigid fillerannealing treatment
Q
PVA vacuum vent section material overflow
A
Overflow is caused by low melt viscosity; temperature reduction and baffle are the key
Extrusion & Post PVAvacuum vent overflowmelt viscositytemperature reductionvent baffle
Q
Dense PVA surface pockmarks
A
Pockmarks are caused by raw material impurities and mold damage; pure raw material and mold maintenance are the key
Extrusion & Post PVAsurface pockmarkimpurity particlesmold repairraw material purity
Q
PVA extruded pipe ovality exceeds standard
A
Ovality is caused by uneven cooling and clamping; annular cooling and uniform haul-off are the key
Extrusion & Post PVA pipeovalityannular coolingvacuum sizinguniform haul-off
Q
Large current fluctuation of PVA extruder
A
Current fluctuation is caused by unstable feeding, poor temperature control and unsuitable screw; system optimization is the key
Extrusion & Post PVA extrusioncurrent fluctuationtemperature control precisionscrew designfeeding stability
Q
PVA extruded film has gel particles
A
Gel particles are caused by insufficient melting; raising temperature and mixing are the key
Extrusion & Post PVA filmgel particlemelting temperaturemixing sectionhigh molecular weight component
Q
PVA extruded film has transverse corrugations
A
Transverse corrugations are caused by haul-off vibration and roller eccentricity; equipment overhaul and stable control are the key
Extrusion & Post PVA filmtransverse corrugationhaul-off vibrationcooling roller eccentricitypressure stabilizing device
Q
Frequent screen clogging in PVA extrusion
A
Screen clogging is caused by impurities and improper configuration; raw material control and stepped screens are the key
Extrusion & Post PVA extrusionscreen clogginggel particlestepped screenautomatic screen change
Q
PVA extruded film wrinkling during winding
A
Film wrinkling is caused by tension fluctuation and uneven thickness; automatic tension control and homogenization are the key
Extrusion & Post PVA filmwinding wrinkletension controlthickness uniformityguide roller parallelism
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