摘要:
The feature of the present invention is that a fiber mixture of silicon carbide or silicon nitride whiskers and alumina or alumina-silica short fibers with 1 to 45 volume percent of the short fibers in relation to the total volume of the whiskers and short fibers is used in the following steps for producing a fiber aggregate: a dispersion step of dispersing whiskers and short fibers into a dielectric fluid; an orientation step of placing the dielectric fluid containing the fibers dispersed therein in a space between a positive electrode and a negative electrode across which a high voltage is applied, whereby causing individual fibers in the dielectric fluid to electrostatically orient, with one end pointing to the positive electrode and the other end pointing to the negative electrode; and an aggregating step of aggregating the electrostatically oriented fibers while keeping the oriented step. The fiber mixture is used in order to grow the bridgings of whiskers around the short fibers as cores. Thus the fiber sedimentation is accelerated by densely bridged fibers while maintaining a satifactory orientation. Hence a whisker aggregate with a larger fiber volume ratio Vf can be formed in a shorter period of time.
摘要:
LIGHTWEIGHT CELLULOSIC PRODUCTS CHARACTERIZED BY A DESIRABLE COMBINATION OF STRENGTH, ABSORBENCY AND TACTILE PROPERTIES ARE FORMED BY AIR LAYING A WEB OF CELLULOSIC FIBERS, AND, THEREAFTER, UNITING THE FIBERS INTO A COHERENT STRUCTURE BY BONDING THEM TOGETHER AT REGULARLY PATTERNED AREAS OF THE WEB WITH ADHESIVELY SUPPLEMENTED HYDROGEN BONDS. THE RESULTING PRODUCTS NEED NOT BE CREPED TO DEVELOP IMPROVED TACTILE CHARACTERISTICS AND MAY BE ADVANTAGEOUSLY USED AS FACIAL WIPES, TOWELING AND THE LIKE.
摘要:
A procedure for controlling the surface mass distribution of a paper web being formed on a dry paper machine, wherein the suction air recirculated to the former is utilized. In procedures of prior art, the surface mass distribution has not been uniform enough. With the aid of the present invention the problem has been solved in that the quantity of air blown to the former is adjusted in the cross-machine direction in order to obtain the desired surface mass distribution.
摘要:
A process is disclosed for producing a non-woven, boron nitride-bonded boron nitride fiber mat, suitable for use as an electric cell separator in a lithium-sulfide battery. Molten boron oxide is centrifugally spun into strands and attenuated by an annular gas stream into fibers which are compacted at a controlled relative humidity into a bundle and heated in an anhydrous ammonia atmosphere to convert boron oxide in the fibers to boron nitride (BN). The BN fibers are blended with a lesser amount of boron oxide fibers and a nonaqueous liquid medium to form a slurry. The slurry is processed through a Fourdrinier machine to form a felt; and, the felt is calendered by passing it through the nip of a pair of calender rolls at an appropriate temperature and pressure to soften the boron oxide binder to fuse the BN fibers together. The interstitial boron oxide then is converted to boron nitride.
摘要:
Polyolefin fibers containing at least 70% by weight of polypropylene fibers having a denier of at least 0.5 and a birefringence of at least 2.5 .times. 10.sup.-.sup.2 are formed into a sheet. The sheet is then frictionally calendered in the dry state at a frictional ratio of at least 15% and at a temperature in the range from 90.degree.C to 160.degree.C whereby an insulating paper having excellent air-impermeability and oil-resistance is obtained.
摘要:
PAPER PRODUCTS USEFUL AS SANITARY WIPES AND TOWELLING ARE PREPARED BY AIR LAYING A WEB OF WOOD PULP FIBERS AND BINDING THE WEB BY PASSING IT THROUGH A NIP FORMED BETWEEN A SMOOTH ROLL AND A PATTERNED ROLL. PRIOR TO BONDING, THE MOISTURE CONTENT OF THE WEB ISADJUSTED TO 6-35%. THE PRODUCTS SO PREPARED, HAVE A VERY DESIRABLE COMBINATION OF STRENGTH, ABSORBENCY, AND TACTILE PROPERTIES COMPARED WITH CONVENTIONAL PRODUCTS. THE PRODUCTS NEED NOT BE CREPED TO DEVELOP THE IMPROVED CHARACTERISTICS.
摘要:
A tufted nonwoven web material exhibiting high loft, bulk and absorbency is made by a papermaking technique using an apertured, plate-like, fiber-collecting element having a structure appropriate to preventing entanglement between adjacent tufts prior to removal from the element. The apertured element is adapted not only to form the tufted nonwoven fibrous web but also to permit consolidation of individual tufts and facilitate the formation of tufted webs from 100 percent wood pulp. Additionally, webs having tufts on both planar surfaces also can be formed by this technique.
摘要:
A polyolefin micro-flake aggregation which is easily micro-flakable from the aggregation into a plurality of irregularly shaped micro-flakes suitable for producing synthetic paper, is manufactured from a solution of 5 - 40% by weight of polyolefin such as polyethylene and polypropylene in a solvent such as hydrocarbons and chlorinated hydrocarbons in the presence of a surface active compound of at least 0.01% based on the weight of the polyolefin by spraying the solution which is at a temperature of at least 100.degree.C from a closed container into atmosphere through an orifice.A polyolefin synthetic paper is formed from a suspension of the micro-flakes in an organic liquid such as hydrocarbons and chlorinated hydrocarbons which can swell or partially dissolve the polyolefin.
摘要:
A process for the manufacture of a composite material comprising a matrix containing aligned reinforcing fibers includes the steps of dispersing the fibers in a viscous liquid, passing the dispersion through an orifice so that the fibers are at least partially aligned, and laying the dispersion containing aligned fibers upon a permeable surface moving relative to the orifice at a velocity at least that at which the fiber dispersion leaves the orifice and withdrawing the viscous liquid through the permeable surface by suction sufficiently rapidly for the alignment of the fibers thereon to be maintained.
摘要:
A novel web that can be produced by the process of the present invention is comprised of two different types of fibers, with the web characterized by having a predominance of one fiber type at one of its major faces, and a predominance of the other fiber type at the other of its major faces. The web includes a transition between the faces in which the predominance of the fibers decreases uniformly away from the face at which they predominate.