High transparency, biodegradable cast film production for composite packaging and communication involves extruding starch esters with polyalkylene glycol, heating, increasing solids content and pressure molding

摘要

Production of high transparency, biodegradable cast film comprises extruding starch esters with 5-20 wt.% of plasticizers, forming a high-concentration solution, that is then heated to 292-361 K and pressure-molding at 4.8-20 m/min to give a film of thickness below 2 mu m. Production of high transparency, biodegradable cast film comprises: (i) extruding starch esters with 5-20 wt.% of the total of plasticizers; (ii) forming a high-concentration solution, that is then heated to 292-361 K with a temperature variation of at most 0.2 K, of the obtained granulate and 30-50 wt.% of the total plasticizer content of polyalkylene glycol and compensating for the reduction in viscosity by increasing the solids content by 16-28 wt.%; and (iii) pressure-molding at 4.8-20 m/min to give a film of thickness below 2 mu.