776results about "Dry spinning methods" patented technology

A robust process for the continuous preparation of solutions of high molecular weight UHMW PO that is capable of producing strong materials at high production capacity, is conservative of capital and energy requirements, and the articles made therefrom.

A process for making a cigarette tow comprising: spinning a dope; taking-up the as-spun cellulose acetate filaments; lubricating the filaments; forming a tow from the filaments; crimping the tow with a stuffer box crimper; drying the crimped tow; and baling the dried crimped tow. The process further comprises at least two of the following:A. crimping further comprising one roller of the pair of nip rollers being adapted to induce crimp into the tow;B. crimping further comprising one roller of the pair of nip rollers being made of a solid ceramic material;C. crimping further comprising a pair of tow edge lubricators;D. crimping further comprising a steam injector;E. further comprising plasticizing the tow;F. lubricating the filaments further comprises a finish consisting of a water emulsion.

The invention discloses a solvent method high-wet-modulus bamboo fiber and a preparation method thereof. The preparation method of the bamboo fiber comprises the following steps: activation, adding bamboo pulp into deionized water, adjusting the pH value, adding cellulase for activation, and then adding alkali to adjust the pH value; squeezing, vacuum dewatering and squeezing; pre-dissolving, adding water solution containing 50-88% of N-methyl morpholine-N-oxide; dissolving, entering a dissolving machine, heating, vacuumizing, dehydrating, dissolving, homogenizing and defoaming; spinning, spraying through a spinneret plate, and molding by adopting a dry wet spinning; washing; whitening; oiling; and drying. The preparation method has simple operation, no industrial pollution, low energy consumption and high safety performance, and is applicable to manufacturing the solvent method bamboo fiber by large-scale industrialized continuous production; furthermore, the bamboo fiber prepared by the method not only maintains the natural physical and chemical properties of the bamboo fiber, but also generates no harmful chemical residue and has higher wet modulus.

An apparatus for forming a nonwoven material from a liquefied polymer, the apparatus comprising: (a) a precipitation electrode; (b) a dispenser spaced apart from the precipitation electrode, and defining a first axis therebetween, the dispenser being at a first potential relative to the precipitation electrode; and (c) a system of electrodes being laterally displaced from the dispenser, being at a second potential relative to the precipitation electrode and capable of providing an electric field having at least one rotating component about the first axis; the dispenser and the system of electrodes being designed and constructed such that the liquefied polymer is dispensed from the dispenser and forms a plurality of entangled fibers moving in a direction of the precipitation electrode, hence forming the nonwoven material thereupon.

An apparatus for forming a tubular structure from a liquefied polymer, the apparatus comprising: (a) a dispenser for dispensing the liquefied polymer; (b) a precipitation electrode being at a first potential relative to the dispenser, the precipitation electrode being designed and constructed for generating a polymeric shell thereupon; and (c) a mechanism for increasing a local density of the polymeric shell in a plurality of predetermined sub-regions of the polymeric shell, thereby to provide a tubular structure having an alternating density in a longitudinal direction.

A process for making a flexible structure that includes at least a first region and a second region, each of the first and second regions having at least one common intensive property that differs in value.