Patent ID: 9522484
Filing Date: 2016-12-20
CPC Classification: B08B,B29B

Claim Text:
1. A powder compounding agent recovery method for a closed pressure type kneader for recovering the powder compounding agent which is ejected from a kneading tank in the closed pressure type kneader, a kneading material being loaded into the kneading tank along with the powder compounding agent loaded from a compounding agent hopper via a powder chute, the kneading material and powder compounding agent being kneaded in the kneading tank by rotation of a pair of kneading rotors with a pressure applied by a pressurizing cap, the method comprising: providing a powder compounding agent recovery device for recovering the powder compounding agent in which an inflatable and deflatable air bag is connected via a ventilation chute that communicates with a pressurizing cap raising and lowering path of the kneading tank, the air bag being connected to a branch duct which is operable to be opened and closed to atmosphere outside the air bag, and an open/close damper being provided in each of the ventilation chute and the branch duct; in kneading of the kneading material and the powder compounding agent in the kneading tank, in the state that the open/close damper of the branch duct is open and the open/close damper of the ventilation chute is closed, loading the powder compounding agent onto the kneading material in the kneading tank while a loading valve disposed in the powder chute and the open/close damper disposed in the ventilation chute are simultaneously opened, thereby allowing a filtering tube disposed inside the air bag to filter and capture the powder compounding agent entrained by a gas which flows from the kneading tank to the air bag while applying a pressure by the gas to the inside of the air bag; allowing the gas ejected from the kneading tank and the powder compounding agent entrained by the gas, as the pressurizing cap is lowered to knead the kneading material and the powder compounding agent, to flow into the air bag and apply a pressure to the inside of the air bag while allowing the filtering tube to capture the powder compounding agent entrained by the gas, and performing a kneading operation by the kneading rotor; at the end of the kneading operation, allowing the gas which has filled in the air bag in a pressurized state to flow into the kneading tank whose internal pressure instantaneously becomes negative when the pressurizing cap is raised so that a flow of the gas blows off the powder compounding agent, which has been filtered and captured by the filtering tube, into the kneading tank; and lowering the pressurizing cap and performing a finishing kneading operation by kneading the powder compounding agent returned to the kneading tank and completing a series of kneading operations.