Process and apparatus for bleaching temperature-sensitive fibers
AssigneeMezzera S.p.A.
InventorEnzo Pintar
Life of this patent
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Abstract
A process for bleaching fibers, particularly animal fibers which become damaged if their temperature rises too high, by applying to them a bleaching agent such as hydrogen peroxide the bleaching reaction of which releases heat sufficient to raise the temperature of the fibers above the temperature at which the fibers become damaged, in which the heat released by the reaction is absorbed by a material added in solid, powder, liquid or gaseous form to the fibers. The added material undergoes a chemical or physical change (such as a change of state) upon absorption of heat without rising in temperature. This allows the fibers to be held in bulk during bleaching without requiring to be spread out for the purpose of heat dissipation.
Claims24
A process for bleaching temperature-sensitive fibres, said process comprising the steps of:
- applying to said fibres a bleaching agent which bleaches the fibres slowly and releases heat,
- adding to said fibres at least one substance which undergoes a chemical or physical change with the absorption of heat,
- collecting the treated fibres into a large mass such that said added substance is distributed throughout the mass of fibres, and
- leaving the fibres in contact with said bleaching agent and said added substance for an extended period during which said added substance undergoes a physical or chemical change and absorbs the heat released by said bleaching agent whereby at least to reduce the temperature rise of the mass of fibres during bleaching.
Dependencies are inferred from the claim text.