摘要:
Disclosed is a method of producing a barrier fabric having stretch and recovery properties. The method includes the steps of heating at least one nonwoven web containing meltblown non-elastic thermoplastic polymer fibers to a temperature at which the peak total energy absorbed by the nonwoven web of meltblown fibers is at least about 250 percent greater than the amount absorbed by the nonwoven web of meltblown fibers at room temperature; applying a tensioning force to neck the heated nonwoven web; and cooling the necked nonwoven web so that the nonwoven web has at least the same hydrostatic head and/or particulate barrier properties as the nonwoven web before necking. Also disclosed is a stretchable barrier fabric composed of a nonwoven web of meltblown non-elastomeric thermoplastic polymer fibers, the nonwoven web being heat treated so that it is adapted to stretch at least about 10 percent more than an identical untreated nonwoven web of meltblown non-elastomeric thermoplastic polymer fibers. The stretchable barrier fabric is adapted to provide a hydrostatic head of at least about 20 cm and/or a particle holdout efficiency of at least about 40 percent for particles having an average size greater than 0.1 micron. The stretchable barrier fabric may be a component of a multilayer material and may be used in disposable protective garments.
摘要:
There is disclosed an animal litter composition and a package for the composition. The composition constitutes decorticated flax straw which as been screened to particle sizes between about 10 and 22 U.S. Screen Mesh. The litter further includes a virucidal composition and a fragrance. The virucidal composition includes from about 0.05 to about 5 percent by weight based on the dry weight of the decorticated flax straw of a preferably anionic surfactant, and at least about 2 percent, based on the dry weight of the decorticated flax straw of at least one acid selected from a group consisting of citric, malic, and mixtures of the acids.The animal litter package constitutes a bag formed from a web of film, nonwoven/film laminates, film/paper laminate or wax/paper laminate in which the animal litter is contained prior to use. The bag can then be opened to serve as a litter box liner. Once the litter has been used, the edges of the bag can be regathered to form a bag for disposal of the litter.
摘要:
Disclosed is a method of producing a nonwoven material having improved resistance to penetration by particles. The method includes the steps of heating at least one nonwoven web containing meltblown thermoplastic polymer fibers to a temperature at which the peak total energy absorbed by the nonwoven web of meltblown fibers is at least about 250 percent greater than the amount absorbed by the nonwoven web of meltblown fibers at room temperature; applying a tensioning force to neck the heated nonwoven web so that at least a portion of individual meltblown fibers have sections where the fiber diameter is substantially less than the diameter of the immediately adjacent sections; and cooling the necked nonwoven web Also disclosed is a nonwoven material composed of at least one web of meltblown thermoplastic polymer fibers, the web containing at least a portion of individual meltblown fibers having sections where the fiber diameter is substantially less than the diameter of the immediately adjacent sections so that the web is adapted to have improved resistance to particle penetration. The nonwoven material may be a component of a multilayer material having desirable resistance to particle penetration.
摘要:
A composite elastic material including at least one reversibly necked material and at least one elastic sheet joined at least at two locations in which the reversibly necked material is formed from a neckable material which has been treated so that, upon application of a force to extend the necked material to its pre-necked dimensions, the material returns generally to its necked dimensions upon termination of the force. Also disclosed is a process for making a composite elastic material by joining a reversibly necked material to an elastic sheet at least at two locations.
摘要:
A specific class of thermoplastic polymers with improved processability resulting from initial partial degradation of high molecular weight polymers using a chemical prodegradant present in excess of the amount reacted during pelletization. This class of polymers includes polymers and copolymers of polypropylene and butylene. After pelletizing, the polymer including unreacted prodegradant can be safely handled and shipped without difficulty. When remelted by extruding or the like, the prodegradant in the pellets reacts, further reducing the molecular weight as well as narrowing the molecular weight distribution of the polymer to a point where high capacity production of quality fibers and extruded products can be obtained.The prodegradant is preferably of the type that predictably and controllably affects the polymer molecular properties without being significantly affected by minor fluctuations in the polymer producer's or processor's manufacturing steps.Specific preferred embodiments include 2,5-dimethyl - 2,5 bis-(t-butylperoxy) hexyne-3; 3,6,6,9,9-pentamethyl-3-(ethyl acetate)-1,2,4,5-textraoxy cyclononane; .alpha.,.alpha.'-bis (t-butylperoxy) diispropyl benzene and 2, 5-dimethyl-2, 5-di (t-butylperoxy) hexane as the prodegradant added in an amount providing an amount of unreacted prodegradant after pelletizing of about 0.01 to 10.0 percent based on the weight of polymer. The present invention reduces the safety hazards present when handling free radical prodegradants by the polymer processor and avoids the need for multiple addition of prodegradants while still producing a material that can be processed easily by the polymer producer and processor.
摘要:
In a mechanical fastening system for an article, a first fastening component of the fastening system is constructed of an oriented nonwoven loop material. The nonwoven loop material is constructed at least part of an nonwoven web of fibers that is extensible from a relaxed configuration to an extended configuration wherein in the extended configuration a greater number of fibers of the nonwoven web are oriented in the direction in which the web is extended than in the relaxed configuration of the web. In one embodiment, the web is in its extended configuration and secured to a substrate A second fastening component of the mechanical fastening system comprises a hook material wherein the oriented nonwoven loop material of the first fastening component is adapted for releasable connection with the hook material of the second fastening component.
摘要:
A method of assembling an expandable absorbent garment includes providing an absorbent composite having a length, opposite ends and opposite side regions. The absorbent composite includes a backsheet, a topsheet and a retention portion disposed between the backsheet and topsheet. The backsheet includes at least one fold formed along at least one of the opposite side regions, wherein the absorbent composite is laterally expandable at least at the opposite ends thereof. The at least one fold of the backsheet is unfoldable along at least the opposite ends of the absorbent composite. The method further includes providing a pair of front body panels having lateral inboard and outboard edges, providing a pair of rear body panels having lateral inboard and outboard edges, securing the said inboard edges of the front body panels to the opposite side regions of the absorbent garment at one of the ends of the absorbent composite, and securing the inboard edges of the rear body panels to the opposite side regions of the absorbent garment at the other of the ends of the absorbent composite.
摘要:
A neckable nonwoven web is provided with a central region and two edge regions, the central region being selectively easier to neck than the two edge regions. The nonwoven fibers in the central region have a polymer composition and/or physical properties which differ from the nonwoven fibers in the two edge regions. The selectively easier necking in the central region causes the central region to neck to about the same extent as the two edge regions, which otherwise would experience greater necking than the central region if the starting nonwoven web were completely uniform. Necked nonwoven webs and neck-bonded laminates made using the improved neckable nonwoven web, are also provided.
摘要:
A breathable multi-layer film laminate including microporous filled film bonded to continuous film. A support layer such as a fibrous web can be adhered to the film laminate on one or both surfaces.
摘要:
The present invention provides a composite elastic necked-bonded material including at least one necked material joined to at least one elastic sheet. The composite elastic necked-bonded material is stretchable in a direction generally parallel to the direction of constriction or necking of the necked material. Also disclosed is a method of producing a composite elastic necked-bonded material by necking a neckable material and then joining the necked material to an elastic sheet.