문제 및 해결책

일반적인 플라스틱 재료 문제에 대한 실질적인 답변

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Q

LLDPE bubble spiral instability

A

LLDPE spiral instability is a direct consequence of extensional softness; dual-lip air ring plus low air speed is the standard countermeasure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;spiral instability;bubble;dual-lip air ring;air speed

Q

LLDPE blown film sharkskin

A

LLDPE sharkskin is harder to cure than LDPE; raising die temperature, changing melt index and adding PPA often need to be combined; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;sharkskin;melt fracture;die temperature;PPA

Q

LLDPE blown film transverse tear

A

LLDPE transverse tear is opened up by the blow-up ratio; the 2-4 times range plus dual-lip air ring setting is the standard combination; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;transverse tear;blow-up ratio;dual-lip air ring

Q

LLDPE blown film machine-direction strength

A

LLDPE machine-direction strength is pulled by the draw ratio; the 1.5-3 times orientation range plus temperature protection is needed to realize the performance advantage; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;machine-direction strength;draw ratio;orientation;temperature

Q

LLDPE film gel particles

A

LLDPE gel management prioritizes filtration; narrow-MWD grades require higher filtration precision; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;gel;gel particle;filtration;recycled material

Q

LLDPE high melt fracture sensitivity

A

LLDPE is a material prone to melt fracture; enlarging die gap, raising temperature and PPA together are needed for a complete cure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post LLDPE;melt fracture;sharkskin;high sensitivity;PPA

Q

LLDPE narrow molecular weight distribution

A

LLDPE's narrow MWD is a trade-off between performance and processability; optical and downgauging advantages must be realized through process refinement; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Analysis LLDPE;narrow MWD;optical properties;downgauging;impact

Q

LLDPE shear rigidity

A

LLDPE's shear rigidity is the core constraint of equipment selection; old equipment with insufficient power is inevitably limited when processing LLDPE; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery LLDPE;shear rigidity;short-chain branch;viscosity;power

Q

LLDPE shrinkage rate 1.5-3%

A

LLDPE's low shrinkage is its dimensional advantage; the 1.5-3% range is subdivided by density, giving a basis for mold shrinkage allowance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling LLDPE;shrinkage rate;1.5-3%;density;dimensional stability

Q

LLDPE injection molded bucket

A

Select low-temperature buckets by impact resistance; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future

Injection Molding LLDPEinjection molded bucketlow temperatureimpact resistance

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카테고리

전체 주제 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