摘要:
A method of forming an air laid web of hydrogen bonded wood pulp fibers is disclosed. More specifically, a paper producing method is disclosed wherein microencapsulated hydrogen bond promoting material is thoroughly premixed with wood pulp fibers. The mixture is then air laid on a moving screen to form a three dimensional continuum. The microcapsules may then be ruptured by heat and/or pressure to release the hydrogen bond promoting material evenly throughout the continuum. The continuum may then be heated or pressed to further consolidate the web.
摘要:
A novel adsorptive nonwoven fabric having good strength as well as good permeability and softness and a method of making the same is disclosed. This product consists essentially of supporting fibers containing a heat-fusible fiber and an adsorptive material, said supporting fibers being disintegrated in air before they are admixed with an adsorptive material, and a web is formed from the final mixture followed by being subjected to a heat treatment at a temperature above the melting point of said heat-fusible fiber to firmly fix said adsorptive material in the web by heat-fusion of the heat-fusible fiber.
摘要:
A process and apparatus for forming an air-laid, nonwoven web from separate supplies of individualized fibers, such as textile and papermaking fibers. Supplies of fibers are fed to oppositely rotating lickerins that are rotated at speeds which are optimum for the fibers being individualized by the lickerins. The individualized fibers are doffed from the lickerins by centrifugal force and high velocity air streams directed against the fibers clinging to the lickerin clothing. The fibers from each supply are entrained in their respective air streams, which are impelled at high rates of speed toward each other, and the air streams come together in a mixing zone. The doffed fibers are given an initial trajectory as they leave their respective lickerins, and the inertia of the fibers in the air streams is sufficient to bring the fibers to the mixing zone and effect blending of at least a portion of the fibers from each supply in the mixing zone. In communication with the mixing zone is a suction actuated condensing means where the fibers are deposited to produce a nonwoven web of fibers, for example, an isotropic nonwoven web. The process and apparatus can be varied to form a variety of nonwoven webs, using as the fibers of these webs two different fibers of the same, or of different lengths. A variable that can be introduced to vary the web construction includes a baffle that can be interposed between the two separate air streams to control the location where the two air streams are intermixed.
摘要:
An apparatus for the preparation of an elastic absorbent composed of a mixed web. Elements of the apparatus can include two supply hoppers for separately supplying pulverized pulp and staple fibers of a synthetic fiber split yarn at a constant mixing ratio with each hopper having a pair of confronting moving belts, two guide mechanisms located below the hoppers, a pair of nip rollers located below the guide mechanisms, a garnet roll located below the pair of nip rollers, a vacuum device located below the garnet roll, and a mesh belt located between the vacuum device and the garnet roll. Each guide mechanism in the apparatus may include at least two gear guides arranged in series. The apparatus operates by feeding the pulverized pulp and the staple fibers of the split yarn from the hoppers to the nip rolls via the guide mechanisms. The nip rolls compress the material, which is then disintegrated and mixed by the garnet roll. The mixture is pulled onto the mesh belt by the vacuum device.
摘要:
There is disclosed a process which comprises:(a) applying an aqueous solution comprising a salt of acrylic or methacrylic acid to an aggregation of fibers;(b) irradiating said aggregation containing said aqueous solution with electromagnetic or corpuscular ionizing radiation to convert said salt of acrylic or methacrylic acid to a water-swellable polymer;(c) individualizing the fibers to disperse the fibers and the said water-swellable polymer;(d) collecting the individualized fibers and water-swellable polymer in the form of a fluffy batt of fibers having distributed therethrough isolated portions of water-swellable polymer affixed to individual fibers or to small groups of fibers.
摘要:
A process for forming an air-laid, nonwoven web from separate supplies of individualized fibers, such as textile and papermaking fibers. Supplies of fibers are fed to oppositely rotating lickerins that are rotated at speeds which are optimum for the fibers being individualized by the lickerins. The individualized fibers are doffed from the lickerins by centrifugal force and high velocity air streams directed against the fibers clinging to the lickerin clothing. The fibers from each supply are entrained in their respective air streams, which are impelled at high rates of speed toward each other, and the air streams are combined in a mixing zone. The doffed fibers are given an initial trajectory as they leave their respective lickerins, and the inertia of the fibers in the air streams is sufficient to bring the fibers to the mixing zone and effect blending of at least a portion of the fibers from each supply in the mixing zone. The combined air stream has a gas to fiber volume ratio of at least 12,000:1, so that the fibers are relatively widely spaced in their respective streams, as well as in the combined stream. In communication with the mixing zone is a suction actuated condensing means where the fibers are deposited to produce a nonwoven web of fibers, for example, an isotropic nonwoven web. With gas to fiber volume ratios of between about 12,000:1 to about 275,111:1 in the combined stream, highly uniform webs can be produced at a high production rate up to 550 feet per minute or greater. The process can form a variety of nonwoven webs, using as the fibers of these webs two different fibers of the same, or of different lengths. To vary the webs, a baffle can be interposed between the two separate air streams to control the location where the two air streams are intermixed. 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.