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US5028691A Process of cooling a heated polyethylene terephthalate film 失效
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Process of cooling a heated polyethylene terephthalate film
摘要:
A process of cooling a heated polyethylene terephthalate film by applying cooling liquid to both surfaces of the heated film and, after the temperature of the film has decreased sufficiently, removing the cooling liquid from the film, wherein the cooling liquid has a pH value between 6 and 3.
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