Molds & Tooling
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PVDF Heat Shrink Tube Irradiation Crosslinking Yellowing
Problem Phenomenon
【Problem Phenomenon】After irradiation crosslinking, PVDF heat shrink tubes show obvious yellowing, with both transparency and toughness decreasing under high irradiation dose
Cause Analysis
Irradiation and thermal processing jointly promote HF removal generating conjugated double bonds; the greater the irradiation dose, the heavier the dehalogenation and the deeper the yellowing; yellowing-resistant patents reduce the required irradiation energy through HF scavengers
Solution
Select yellowing-resistant modified grades to reduce irradiation energy demand; set the irradiation dose at the lower limit of crosslinking degree; extrusion section 200-250℃ and fully dry at 70℃×5h to prevent processing yellowing from superimposing
Key Takeaway
Irradiation yellowing is dual-controlled by yellowing-resistant grade plus lower dose limit; 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 subsequent similar problems
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