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    • 53. 发明授权
    • Method for producing cellulose ester film
    • 生产纤维素酯薄膜的方法
    • US5393476A
    • 1995-02-28
    • US953226
    • 1992-09-30
    • Yuji Suzuki
    • Yuji Suzuki
    • C08J5/02B29C41/24B29C47/00B29C47/88B29K1/00B29L7/00C08J5/18G03C1/785B29C41/28
    • C08J5/18B29C41/24B29C47/0021B29C47/885B29K2001/00B29K2001/12B29L2007/008C08J2301/12
    • A method for producing a film or sheet of a cellulose ester such as cellulose triacetate (TAC), cellulose diacetate, or the like, in which a film-forming solution is extruded through the slot of an extrusion die onto a support while a liquid is dropped at opposite ends of the die onto the flow of the film-forming solution emerging from the slot, thereby to prevent slugging of the solution, wherein a solvent contained in the dropping liquid contains a poor solvent for a solute in the film-forming solution in an amount in a range of from 30% to 90% by weight relative to a good solvent for the solute contained in the dropping liquid. With the invention, slugging is prevented and production efficiency improved without adversely affecting the formed film, without problems in separating the film from the support due to insufficient drying, and without requiring periodic cleaning of the support or reduction of the film production rate.
    • 制造纤维素酯如三醋酸纤维素(TAC),纤维素二乙酸酯等的薄膜或片材的方法,其中将成膜溶液通过挤出模头的槽挤出到载体上,同时液体为 从模具的相对端落下到从槽出来的成膜溶液的流动,从而防止溶液的堵塞,其中滴加液中所含的溶剂含有成膜溶液中的溶质的不良溶剂 相对于滴液中含有的溶质的良溶剂,其含量为30〜90重量%。 通过本发明,防止了堵塞并提高了生产效率,而不会对成形膜产生不利影响,由于干燥不足而不需要将膜与支撑体分离,并且不需要定期清洁支撑体或降低膜生产速率。
    • 56. 发明授权
    • Process for producing cellulose triacetate films
    • 生产三醋酸纤维素薄膜的方法
    • US5188788A
    • 1993-02-23
    • US736342
    • 1991-07-26
    • Yuji SuzukiTakeshi Yamazaki
    • Yuji SuzukiTakeshi Yamazaki
    • B29C41/12B29C41/24B29C41/34B29D7/01B29K1/00B29L7/00C08J5/18
    • B29C41/24B29D7/01B29K2001/00
    • A process for producing cellulose triacetate films that is capable of not only suppressing the growth of foreign matter on transport rollers, but also markedly reducing the necessary number of cleaning operations. The process includes steps of casting a solution of cellulose triacetate onto a support having it surface cooled at 20.degree. C. or below, drying and cooling the solution cast onto the support to solidify the cast solution, separating the subsequently solidified film from the support, and transporting the film while it dries on transport rollers. In accordance with the invention, for a weight proportion of the solvents in the film as separated from the support of at least 40 wt %, the surface of the transport rollers is made of a material having a surface energy of no more than 80 dynes/cm at 20.degree. C.
    • 一种能够不仅抑制运送辊上的异物生长的纤维素三乙酸酯膜的制造方法,而且显着地减少了必要的清洗量。 该方法包括以下步骤:将三乙酸纤维素溶液浇注到其表面冷却至20℃或更低的载体上,干燥并冷却流延到载体上的溶液以固化流延溶液,将随后固化的膜与载体分离, 并在运送辊上干燥时运送胶片。 根据本发明,对于与载体分离的膜中溶剂的重量比例至少为40重量%,输送辊的表面由表面能不超过80达因/厘米2的材料制成, cm在20℃