Abstract: The present invention provides a biodegradable resin having an intrinsic viscosity of 1.0 dL/g or more, and having a loss rate of intrinsic viscosity of 10% or more after treatment at 70° C. and 85% RH for 6 hr. The present invention also provides a biodegradable resin containing 70 wt% or more of polylactic acid and having a relative biodegradation rate up to 90% or more within 12 months when the degradability in home composting at 28° C. is evaluated according to the conditions specified in ASTM D5338-15. The biodegradable resin has the characteristics of fast biodegradation speed and stable storage, has good mechanical properties, optical properties and barrier properties, can be applicable to various aspects including packaging and express transportation, and will quickly biodegrade into carbon dioxide, water and other small molecules without contamination to the environment at the end of service life.

Abstract: An improved combined rotating toner feeding device, includes: a cartridge body; a back cover provided on a bottom of the cartridge body; and a back cover sealing ring provided between the cartridge body and the back cover; wherein a driving gear is provided on a top portion of the cartridge body; two gear sealing rings are respectively provided on two ends of the driving gear; a cross body is inserted in an internal side of the driving gear; a feeding toner stirring blade is fixed on an external side of the cross body; a cartridge top cover is provided on a top portion of the cartridge body; a snap cover is buckled on a top portion of the cartridge top cover; a sealing strip is provided on a bottom of the snap cover.

Abstract: An improvement rotating powder drop structure includes a toner cartridge, wherein a toner cartridge rear cover is located at a bottom of the toner cartridge, a rear cover sealing gasket is located between the toner cartridge and the toner cartridge rear cover, a driving gear is sleevedly connected to a top of the toner cartridge, a powder exit is provided at an inner side of the driving gear, a powder exit sealing gasket is provided at an inner side of the powder exit, two first powder blocking flakes are respectively symmetrically located at two sides of the powder exit, two second powder blocking flakes are respectively fixed to two first powder blocking flakes, a spring is located within the powder exit, a slide bar is located at a top of the spring, an upper cover is located at the top of the toner cartridge.