Abstract: The present invention provides an animal fibers having improved shrink proofing and pilling resistance properties and method for preparation thereof. An animal fiber having excellent shrink proofing and pilling resistance and retaining its original water repellency is also provided. A method of treating animal fiber in which a surface layer part of animal fiber is primary-oxidized in advance with an oxidizer, and aqueous treatment liquid containing ozone in the form of ultrafine bubbles of 5? or less is allowed to collide against the fiber by blowing the liquid on the fiber in the aqueous treatment solution, and then, the fiber is treated with a reducing agent. Particularly, the above-mentioned method for treating animal fiber in which ultrafine bubbles of ozone are formed by using a line mixer. The method in which an apparatus which collects the ultrafine ozone bubbles in aqueous treatment liquid on the fiber is used so that the bubbles are not scattered out of a treatment reaction bowl.

Abstract: A mechanism, giving less environmental load, for treating animal fibers of a continuous web form so as not to spoil inherent properties of the animal fibers such as hand-feeling and water repellency, so as to improve resistance to felting (shrinkage) and pilling. The mechanism includes: a tank filled with a treatment liquid; a net-conveyor having upper and lower mesh belts put one upon the other to sandwich the continuous web form therebetween for conveying the web form through the liquid of the tank; a treating-liquid circulation system including a gas-liquid mixing pump connected to a suction-port in the tank and pumping out the liquid, a static mixer connected downstream of the pump, and a discharge nozzle placed at a position in the tank facing the suction-port with the mesh belts therebetween, the discharge nozzle being connected downstream of the mixer; and an ozonizer for supplying ozone gas into the system.

Abstract: A slenderized crimped animal fiber with a fixed slenderized form having a lowering rate of tensile strength for undyed spun yarn of no less than 10%, fiber contraction in boiling water of no more than 1%, an alkali solubility of no more than 22% by weight and a UB solubility of no more than 35% by weight, wherein the slenderized crimped animal fiber is prepared by being drawn by practically 1.20 to 1.60 times after an anisotropic swelling is given to the animal fiber consisting of bilateral structure using swelling plasticization with base.

Abstract: A mechanism, giving less environmental load, for treating animal fibers of a continuous web form so as not to spoil inherent properties of the animal fibers such as hand-feeling and water repellency, so as to improve resistance to felting (shrinkage) and pilling. The mechanism includes: a tank filled with a treatment liquid; a net-conveyor having upper and lower mesh belts put one upon the other to sandwich the continuous web form therebetween for conveying the web form through the liquid of the tank; a treating-liquid circulation system including a gas-liquid mixing pump connected to a suction-port in the tank and pumping out the liquid, a static mixer connected downstream of the pump, and a discharge nozzle placed at a position in the tank facing the suction-port with the mesh belts therebetween, the discharge nozzle being connected downstream of the mixer; and an ozonizer for supplying ozone gas into the system.

Abstract: A slenderized crimped animal fiber with a fixed slenderized form having a lowering rate of tensile strength for undyed spun yarn of no less than 10%, fiber contraction in boiling water of no more than 1%, an alkali solubility of no more than 22% by weight and a UB solubility of no more than 35% by weight, wherein the slenderized crimped animal fiber is prepared by being drawn by practically 1.20 to 1.60 times after an anisotropic swelling is given to the animal fiber consisting of bilateral structure using swelling plasticization with base.

Abstract: The present invention provides an animal fibers having improved shrink proofing and pilling resistance properties and method for preparation thereof.

Abstract: A sliver of animal wool is subjected to hot drawing under its wet state to provide a slenderized fine animal wool.

Abstract: According to the present invention, an animal hair fiber can significantly be modified by fixing the supercontraction of the fiber which is a disadvantage in itself. The process for modifying the animal hair fiber according to the present invention comprises pretreating the animal hair fiber with a cleaving reagent for crosslinkage of the fiber and then treating the pretreated fiber with an supercontracting reagent. Furthermore, the process for preparing a bulky wool yarn according to the present invention comprises treating an mixed yarn with the supercontracting reagent, said mixed yarn consisting of the pretreated animal hair fiber with the cleaving reagent for crosslinkage of the fiber and a non-pretreated animal hair fiber.

Abstract: The present invention relates to the production of descaled animal fiber. The scale is effectively removed by oxidation of a surface of the animal fiber with an oxidizing reagent, following by treatment with a proteolytic enzyme in the presence of salt. The resulting animal fiber has excellent shrink-proof properties.