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Q

PVC Extrusion Pipe Temperature

A

PVC pipe extrusion is the art of zoned temperature control; each zone has its duty, local overheating immediately shows; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post PVC; extrusion; pipe; zoned temperature; die head

Q

PVC Mold Temperature 30-50℃

A

PVC mold temperature set by rigid/soft grading; 30-50℃ baseline with sufficient cooling, both surface and cycle considered; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molds & Tooling PVC; mold temperature; 30-50℃; surface; cooling

Q

PVC Shear Heat Exceeding Standard

A

PVC temperature measurement must measure actual melt value, shear heat is the invisible killer; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar prob...

Processing Machinery PVC shear heat screw speed actual measurement

Q

PVC Residence Time Management

A

Residence time is PVC's second red line besides temperature; 40-75% shot ratio plus replacement procedure, neither can be omitted; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Processing Machinery PVC; residence time; shot weight; replacement; degradation

Q

PVC De-HCl Degradation Mechanism

A

PVC degradation is an autocatalytic chain reaction; once started it is irreversible and spreads with acceleration, prevention is the only effective strategy; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Molding Process PVC; de-HCl; autocatalysis; chain degradation; heat stabilizer

Q

PVC Processing Window 160-195℃

A

PVC temperature discipline is the strictest among general-purpose plastics; 200℃ is an untouchable red line, the narrow window determines dual high requirements for equipment and management; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recu...

Processing Machinery PVC; processing window; 160-195℃; 200℃; temperature control

Q

PVC Drying 75-90℃

A

PVC drying requirement is lower than nylon but cannot be omitted; 75-90℃×1.5-2.5h is the general specification, moisture-affected material must be re-dried; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Material Drying PVC; drying; 75-90℃; silver streak; bubble

Q

PVC Injection Product Stress Cracking

A

PVC cracking = 'stress + media': internal stress is the internal cause, media is the external cause; high-stress parts must reduce stress from both process and structure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Injection Molding PVC; stress cracking; media; internal stress

Q

PVC Soft Product Plasticizer Exudation

A

PVC soft material oiling = 'plasticizer compatibility': compatibility and dosage are key; high-molecular plasticizers migrate slowly, the upgrade direction for preventing oiling; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.

Processing Machinery PVC; soft; plasticizer; exudation; sticky

Q

PVC Rigid Pipe Insufficient Impact Resistance

A

PVC rigid pipe impact resistance = 'plasticization + modification system': poor plasticization and insufficient modifier are the two roots; low-temperature impact is the hard indicator of rigid pipe, plasticization and formula must both reach standard.

Processing Machinery PVC; pipe; impact resistance; plasticization degree; modifier

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الفئات

جميع المواضيع 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