Manufacturing method of biodegradable net-shaped articles
A manufacturing method of biodegradable net-shaped articles includes: (a) preparing a biodegradable 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 so as to obtain a net-shaped preform; and (e) cooling and thereby finalizing the net-shaped preform in a cooling bath at 15° C. to 30° C. so as to obtain the net-shaped article.
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.
2. The manufacturing method of claim 1 , wherein the extruder has a processing temperature between 115° C. and 180° C.
3. The manufacturing method of claim 1 , wherein the screw temperature is up to a temperature that is 30° C. to 40° C. higher than the feed inlet temperature.
4. The manufacturing method of claim 1 , wherein the screw temperature is up to a temperature that is 40° C. higher than the die temperature.
5. The manufacturing method of claim 1 , wherein the rotary die unit has a telescoped trunk and a rotating sleeve that is configured to rotate with respect to the telescoped trunk.
6. The manufacturing method of claim 1 , wherein the screw temperature is increased when a weight percentage of PBS in the second material is decreased.
7. The manufacturing method of claim 1 , wherein the extruder is a dual-screw extruder.
8. The manufacturing method of claim 1 , wherein the net-shaped article is further processed into a bathing ball net.
9. The manufacturing method of claim 1 , wherein the net-shaped article is further processed into a drain strainer.
10. The manufacturing method of claim 1 , wherein the net-shaped article is further processed into a geogrid.