Processing Method of A Non-PVA Hollow Yarn and The Tubular Fabric

Abstract

The invention discloses the processing method of a non-PVA fiber hollow yarn and the tubular fabric. The fiber shall include filament yarn, staple yarn and ribbon. The processing method applies degradable fiber which is controllable in degradation conditions and has none formaldehyde residue to produce hollow yarn, in contrast with conventional soluble Vinylon hollow yarn, which is environmentally friendly and cheap while has low shrinkage and distinct hollow effect as can be made into high density textile and single yarn textile through sizing process. Furthermore, the tubular fabric as described in this invention spinned with the non-PVA fiber hollow yarn is feature with lightness, fluffy sense, warmth, moisture absorption and softness.

What is claimed is: 
     
         1 . Processing method of non-PVA fiber hollow yarn is featured with the following steps:
 a. Process degradable fiber which is controllable in degradation condition and has none formaldehyde residue. The fiber should include filament yarn, staple yarn and ribbon;   b. Cover the degradable fiber which is controllable in degradation condition and has none formaldehyde residue with outer fiber through open-end-spinning or non-open-end-spinning. The outer fiber should include various staple fibers to produce covering yarn;   c. Dissolve the degradable fiber which is controllable in degradation condition and has none formaldehyde residue in the covering yarn to produce hollow yarn;   Among them, process a shall include preparation of alkaline degradation section, preparation of blended spinning melts and spinning procedure. In process c, the dissolution temperature shall be 20-100° C., the alkaline concentration shall be 1.5-30 g/l, within 20 min-24 hours.   
     
     
         2 . According to  claim 1 , the processing method of non-PVA fiber hollow yarn is featured with that the preparation of alkaline degradation section in process a shall include the following steps: Add sodium sulfonate—isophthalic acid glycol ester at total polymer weight of 1-20% and isophthalic acid at total polymer weight of 1-20% during polymerization process of polyester staple fiber, beat and stir while heating up to 230-250° C. Then move to reactor and again add in ethylene glycol at total polymer weight of 1-20% to dilute, and cool down to 200-210° C.; Add in polyethylene glycol at molecular weight of 4000-6000 which takes 1-20% of the total weight of polymer. Complete the addition of polyethylene glycol within 40-50 min while keep stirring. Under room temperature, heat up to 230-250° C. and make the mixture to polymerize in vacuum condition. Then the alkaline degradation section after polymerization and perform the cast stripping, cooling, grain cutting, drying and selection procedures. The intrinsic viscosity of alkaline degradation section shall be 0.55-0.75. 
     
     
         3 . According to  claim 2 , the processing method of non-PVA fiber hollow yarn is featured with that the preparation of blended spinning melt in process a shall include the following steps: Put the above alkaline degradationnrr section into stainless-steel degradation kettle and stir to form spinning melt while heating. During the preparation of spinning melt, blend degradable material into it. The proportion by weight of alkaline degradation polymer and degradable material shall be 100:0-60:40. Part of the degradable material will be filtered or dissolved to form microvoid on the fiber surface along the axes. 
     
     
         4 . According to  claim 2 , the processing method of non-PVA fiber hollow yarn is featured with that the degradable material shall include porous agent Kaolin, degradable silicon dioxide, degradable barium sulfate, degradable calcium carbonate or water-soluble polyester. 
     
     
         5 . A tubular fabric is featured with that it shall be spinned with hollow yarn processed according to  claims 1  to  4 .