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Problem & Solution

Practical answers to common plastic material challenges

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11636 questions
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
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Q
PVA hardness too high
A
High hardness is caused by crystallization and filler; adjusting cooling and filler are the key
Material Analysis PVAhigh hardnesscrystallinityfiller amountplasticizer
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Q
PVA surface tiger-skin pattern
A
Tiger-skin pattern is caused by unstable injection front; multi-stage injection and high mold temperature are the key
Injection Molding PVAtiger-skin patterninjection speedmulti-stage injectionmold temperature control
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Q
Low PVA elongation at break
A
Low elongation at break is caused by low molecular weight and orientation; selecting high MW and reducing orientation are the key
Material Analysis PVAelongation at breakmolecular weightorientation controlcrosslinking degree
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Q
Large PVA compression set
A
Large compression set is caused by insufficient crosslinking; increasing crosslinking degree is the key
Molding Process PVAcompression setcrosslinking degreeelastic recoveryreinforcing filler
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Q
PVA surface frosting precipitation
A
Frosting is caused by low molecular migration and precipitation; selecting a high molecular weight grade is fundamental
Production & Quality PVAfrostinglow molecular migrationhigh molecular weightlubricant precipitation
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Q
PVA surface stress whitening
A
Stress whitening is caused by orientation and internal stress; reducing orientation and annealing are the key
Molding Process PVAstress whiteningorientation stressannealing treatmentstress concentration
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Q
Fast PVA thermal aging
A
Thermal aging is caused by thermal oxidation; improving the antioxidant system is the key
Material Analysis PVAthermal agingthermal oxidationantioxidanthigh molecular weight
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Q
Insufficient PVA mixing
A
Insufficient mixing is caused by improper screw design; increasing the mixing section is the key
Processing Machinery PVAinsufficient mixingscrew mixing sectionkneading blockside feeding
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Q
Poor PVA fatigue resistance
A
Poor fatigue resistance is caused by insufficient recovery and fast crack propagation; increasing crosslinking is the key
Molds & Tooling PVAfatigue resistancecrosslinking degreemolecular weightstress concentration
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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
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