Extrusion & Post
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Rubber Migration/Bleeding of Biaxially Oriented Polypropylene Film HIPS Products
Problem Phenomenon
Rubber migration or bleeding appears on the surface of HIPS products, and the surface becomes sticky or discolored, affecting the product appearance and printing performance.
Cause Analysis
(1) The rubber content is too high or the compatibility with the base material is poor
(2) The processing temperature is too high, and the rubber partially degrades and migrates
(3) The storage temperature of the product is high, accelerating rubber migration
(4) The rubber particle size is too large, making it easy to migrate
(5) Additives interact with the rubber and promote migration
Solution
(1) Select a grade with suitable rubber content and compatibility
(2) Control the processing temperature within the range of 140-170(stretching)/230-260(extrusion)°C
(3) The storage temperature of the product does not exceed 40°C
(4) Select a grade with a small rubber particle size
(5) Reduce additives that may interact with the rubber
Key Takeaway
HIPS rubber bleeding is caused by compatibility and temperature.
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