Material Drying
5 görüntüleme
Decreased Transparency/Yellowing of Biaxially Oriented Polypropylene Film SAN/AS Products
Sorun Belirtisi
The transparency of SAN/AS products is below standard or yellowing appears.
SAN is known for its transparency and heat resistance.
Neden Analizi
(1) The processing temperature is too high, and the material thermally degrades and turns yellow
(2) The moisture content of the raw material is high, and micro-bubbles form in the product
(3) The regrind is used multiple times, and the material ages and turns yellow
(4) The additives are poorly dispersed, affecting transparency
(5) The mold temperature is improper, and the surface replication effect is poor
Çözüm
(1) Control the processing temperature within the range of 140-170(stretching)/230-260(extrusion)°C
(2) Fully dry the raw material, with moisture content ≤0.02%
(3) Control the regrind ratio to not exceed 10%
(4) Use additives with good dispersibility
(5) Optimize the mold temperature to the higher value within the range of 20-60°C
Temel Çıkarım
The decrease in SAN transparency is caused by thermal degradation or micro-bubbles.
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