Abstract: A method for recycling treatment of refuse of plastic molded articles, e.g. polyethylene terephthalate bottles comprises immersing the refuse into hot water of 70.degree.-100.degree. C. while agitating to detach and remove bottom coverings of dissimilar plastics, detaching paper labels on the plastic articles by steam injection, breaking the detached labels and the plastic articles into fragments, separating the mixture by wind-force sorting to remove most of the labels, further separating the fragments of plastic articles and residual labels by flying sorting to obtain the fragments only of the plastic articles, cleaning the fragments of the plastic articles by ultrasonic energy to remove all impurities, and preparing the purified plastic articles as chip or pellet plastic material.

Abstract: Waste thermoplastic resin film is cleaned to reclaim raw material for subsequent recycling by crushing a mass of the waste film into pieces and then feeding the pieces onto a moving mesh conveyor immersed in a wash tank which is filled with a cleaning liquid; the liquid being at a temperature sufficient to soften the pieces. Cleaning is promoted by irradiating the pieces on the conveyor with ultrasonic energy from positions located on opposite lateral sides of and just above the upper surface of the conveyor while simultaneously forcing liquid in the tank to flow in the same direction as the conveyor while directing jets of additional liquid into the tank in the opposite direction to produce a forced circulatory flow pattern within the tank.

Abstract: Waste thermoplastic resin film is cleaned to reclaim raw material for subsequent recycling by crushing a mass of the waste film into pieces and then feeding the pieces onto a moving mesh conveyor immersed in a wash tank which is filled with a cleaning liquid; the liquid being at a temperature sufficient to soften the pieces. Cleaning is promoted by irradiating the pieces on the conveyor with ultrasonic energy from positions located on opposite lateral sides of and just above the upper surface of the conveyor while simultaneously forcing liquid in the tank to flow in the same direction as the conveyor while directing jets of additional liquid into the tank in the opposite direction to produce a forced circulatory flow pattern within the tank.