Method of cleaning poultry feathers

Claim 1

A method of cleaning large batches of poultry feather material without the feathers becoming substantially twisted or clotted in lumps and with the feather material retaining its bulk and tufted state, said method comprising the steps of: prior to removing dust from the feathers performing the step of washing the feather material in a washing chamber with an organic cleaning liquid consisting primarily of chlorinated hydrocarbons to provide cleaned feathers and aseptic dust, centrifugally separating said organic cleaning liquid from said feather material, blowing the feathers through a passageway from said washing chamber to a separate drying compartment separated from said washing chamber, drying said feather material in said drying compartment at temperatures of up to 130° C. with the volume of said drying compartment substantially exceeding that of said washing chamber to prevent the feathers from becoming twisted during drying and to provide feathers in a high-bulk and tufted state, blowing the feathers from said drying compartment through a pipe to a separate dust removing apparatus, filtering the aseptic dust in a filter, removing aseptic dust from said cleaned feathers by blowing the feathers in said dust removing apparatus to separate aseptic dust from the feathers, discharging the cleaned and dusted feathers from said separate dust removing apparatus, and processing said centrifugally separated cleaning liquid by a distillation thereof in a distillation vessel separate from said washing chamber to remove solids and other foreign materials to prepare said cleaning liquid for reuse in said washing step, recycling said distilled cleaning liquid to said washing chamber, and recovering animal fats or greases from a distillation bottom fraction obtained by said distillation of said cleaning liquid.

Claim 2

A method of cleaning large batches of poultry feather material without the feathers becoming substantially twisted or clotted in lumps and with the feather material retaining its bulk and tufted state, said method comprising the steps of: prior to removing dust from the feathers performing the step of washing the feather material in a washing chamber with an organic cleaning liquid consisting primarily of chlorinated hydrocarbons to provide cleaned feathers and aseptic dust, centrifugally separating said organic cleaning liquid from said feather material, blowing the feathers through a passageway from said washing chamber to a separate drying compartment separated from said washing chamber, drying said feather material in said drying compartment at temperatures of up to 130° C. with the volume of said drying compartment substantially exceeding that of said washing chamber to prevent the feathers from becoming twisted during drying and to provide feathers in a high-bulk and tufted state, blowing the feathers from said drying compartment through a pipe to a separate dust removing apparatus, filtering the aseptic dust in a filter, removing aseptic dust from said cleaned feathers by blowing the feathers in said dust removing apparatus to separate aseptic dust from the feathers, discharging the cleaned and dusted feathers from said separate dust removing apparatus, and processing said centrifugally separated cleaning liquid by a distillation thereof in a distillation vessel separate from said washing chamber to remove solids and other foreign materials to prepare said cleaning liquid for reuse in said washing step, recycling said distilled cleaning liquid to said washing chamber, and recovering animal fats or greases from a distillation bottom fraction obtained by said distillation of said cleaning liquid.