Hello to all,
I wish to get some information about our product which a shrink hood film. We are facing a problem after the shrink is done by heating the surface of the film start to produce holes on some points. Why this behaviour is observed? What can be the preventive measures taken to rule out this problem?
Kind Regards,
Alyaan Khan
Alberto D'Amore
Dear Alyaan,
there are two possible reasons:
1) the bi-axial stretching to whch the film is subjected before its use in servisce is too much severe
2) any impurity within the bulk film may act as stress concentrator. Holes (that is , defectswith circular simmetry) are due to the bi-axial shrinkage in the film plane.
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Ricardo Pinedo
What resins or blends are you using? Shrink ratio depends on it as does also MD/TD elmendorf tear resistance As alberto says gels from x-linking due overheating) or un-molten material due extruder problems could act as stress concentrators and initiate a tear. Have you done a good analysis of gauge distribution? MD and TD. Normally film tears in thin spots
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