Patent ID: 9017587
Filing Date: 2015-04-28
Classification: A46D,B29B,B29C,B65D,D01F,D04H,Y02W

Abstract:
1. A manufacturing method of biodegradable net-shaped articles comprising steps of: (a) preparing a mixture having a melt flow index of between 3 and 8 by heating, stirring and thereby mixing a first material, a second material and a compatibilizer, with the first material being poly(butylenes adipate-co-terephthalate) (PBAT) in an amount of 20%-80% by weight based on a total weight of the mixture, and the second material as well as the compatibilizer making up the mixture to 100% of the total weight of the mixture, wherein the second material is a composition of polybutylene-1,4-succinate (PBS) and polylactic acid (PLA), in which PBS and PLA are in an amount of 70%-100% by weight and in an amount of 0%-30% by weight based on a total weight of the second material, respectively, and wherein the compatibilizer is in an amount of at least 0.05%-0.5% by weight based on the total weight of the mixture; (b) granulating the mixture into plastic grains; (c) baking the plastic grains in an oven at 60° C. to 70° C. for 3 to 4 hours; (d) melting and extruding the plastic grains by a screw-type extruder that has a rotary die unit so as to obtain a net-shaped preform, wherein in the extruder, a screw temperature is higher than a feed inlet temperature and a die temperature, while the die temperature is lower than the feed inlet temperature; (e) cooling and thereby finalizing the net-shaped preform in a cooling bath at a cooling temperature between 15° C. and 30° C., so as to obtain the net-shaped article.