Abstract:
A process for producing low-density composite components as disclosed herein involves forming a compacted and curable pre-preg into a selected level of compaction whereby voids are capable of forming in the compacted curable pre-preg. The compacted curable pre-preg is then cured at a pressure sufficiently low to permit evolving gases to form voids in the pre-preg as the pre-preg cures into the composite article. The pre-preg is only partially debulked in the process. Rocket nozzle components may be produced with reduced densities while still exhibiting satisfactory erosion and other characteristics desired for products subject to the harsh erosive environment of a rocket motor.
Abstract:
A laminated sheet made by bonding a nonwoven fabric to a non-porous waterproof, windproof and moisture permeable film. The bonding may be carried out by hot pressing in combination with a hot-melt adhesive and the laminated sheet may have a water vapor transmission rate of 1,000 to 10,000 g/m2nullh. The laminated sheet may be further bonded to a face fabric, making the resulting structure particularly suitable for use in the construction of garments.
Abstract translation:将无纺布粘接到无孔防水,防风透湿膜上制成的层压片。 接合可以通过与热熔粘合剂组合的热压进行,并且层压片可以具有1,000至10,000g / m 2·h的水蒸汽透过率。 层压片材可以进一步粘合到面料上,从而使结构特别适用于衣服的构造。
Abstract:
A method of producing an elasticized member having two different degrees of stretch, to be used in an absorbent product. The method involves stretching an elastic member by a first amount and securing part of it in the stretched condition to an inelastic web, while a second portion of the elastic member is stretched by a second amount and secured in the stretched position to the first web or to a second web. Differentially stretched products produced by the method can be used to provide advantages in terms of material savings and elasticity effects in absorbent products.
Abstract:
An absorbent structure that includes: (1) a liquid permeable cover having a first surface area; (2) at least one layer of at least one liquid management material having a second surface area that is less than the first surface area; and (3) an adhesive system joining the liquid permeable cover and the liquid management material. The continuous layer of adhesive overlaying the permeable cover material desirably has a basis weight of 7.5 gsm or less. For example, layer of adhesive may have a basis weight of 4 gsm or 1.0 gsm or less .The absorbent structure may be mechanically post-treated. For example, the absorbent structure may be introduced into a nip and/or subjected to mechanical post treatments such as, for example, embossing, perforating, brushing, creping, aperturing and the like. A method of making an absorbent structure that may include the following steps: (1) providing a liquid permeable nonwoven cover composed of a matrix of fibrous material and having a plurality of individual exposed fiber surfaces; (2) applying a thin, substantially continuous layer of adhesive material coating to at least a portion of the individual exposed fiber surfaces of individual fiber surfaces; (3) providing at least one layer of at least one liquid management material; and (4) joining the liquid permeable cover and the liquid management material. A non-contact adhesive system for joining dissimilar material components in which an adhesive is applied at a rate of less than 7.5 gsm utilizing a non-contact applicator in several generally parallel, substantially or totally non-intersecting lines after the cover and discrete liquid management material (distribution layer) are joined and exit a post treatment step such as, for example, an aperturing module. The adhesive could also be applied in several wavy lines, sinusoidal lines, parallel lines and other similar non-intersecting adhesive configurations.
Abstract:
The present invention is a method for fabricating shaped monolithic ceramics and ceramic composites, and the ceramics and composites made thereby. The method of the present invention includes three basic steps: (1) Synthesis or other acquisition of a porous preform with an appropriate composition, pore fraction, and overall shape is prepared or obtained. The pore fraction of the preform is tailored so that the reaction-induced increase in solid volume can compensate partially or completely for such porosity. It will be understood that the porous preform need only be sufficiently dimensionally stable to resist the capillary action of the infiltrated liquid reactant; (2) Infiltration: The porous preform is infiltrated with a liquid reactant; and (3) Reaction: The liquid reactant is allowed to react partially or completely with the solid preform to produce a dense, shaped body containing desired ceramic phase(s). The reaction in step (3) above is a displacement reaction of the following general type between a liquid species, M(l), and a solid preform comprising the compound, NBXC(s): AM(l)nullNBXC(s)nullAMXC/A(s)nullBN(l/g) where MXC/A(s) is a solid reaction product (X is a metalloid element, such as, for example, oxygen, nitrogen, sulfur, etc.) and N(l/g) is a fluid (liquid or gas) reaction product. A, B and C are molar coefficients.
Abstract:
A sheet-form structure of expandable thermoplastic resin is provided which is capable of undergoing a pseudo-one-dimensional expansion in its thickness direction and which enables manufacture of thermoplastic resin foams having reduced variations in thickness and weight precisions, increased compressive strength, and excellent properties such as surface smoothness. A method of manufacturing the sheet-form structure, as well as such thermoplastic resin foams, are also provided. A sheet-form structure 1 of expandable thermoplastic resin including granules 2 of expandable thermoplastic resin arranged generally uniformly for integral connection thereof through a thin film 3 of expandable thermoplastic resin. A thermoplastic resin foam including a continuous, thermoplastic resin foam layer, a number of highly-expanded, thermoplastic resin portions provided on at least one surface of the continuous foam layer, and slightly-expanded, thermoplastic resin thin films for covering outer surfaces of respective highly-expanded portions.
Abstract:
A polymer-impregnated paper-based web for use as a medical packaging bacteria barrier fabric is provided. The use of a particular type of polymer emulsion as the saturant provides the effective range of bacteria filtration while at the same time allowing the web to maintain its enhanced strength and delamination resistance that are required when such substrates are employed to wrap surgical trays, surgical instruments, medical appliances and the like prior to sterilization. The invention consists of a paper-containing medical packaging substrate that has been saturated with a polymer having a glass transition temperature of null20null C. or less.
Abstract:
This invention provides a composite material having a matrix of structural material containing embedded zones of soft elastic material and zones of solid relatively high density material within the soft elastic material. By selecting a particular resonance frequency for the subunits of soft elastic material and solid high density material, frequencies just lower than the resonance frequencies will be unable to propagate through the material and be strongly reflected or absorbed. Such material may be used in the manufacture of filters or shields against particular target frequencies. Subunits having a variety of resonance frequencies may provide a broader range of frequencies that the material may shield.
Abstract:
This invention relates to a general method to surface modify porous membranes with a free radical polymerized polymer coating in a layer which is less than the thickness of the membrane. Another object of this invention relates to a general method to surface modify porous membranes with a free radical polymerized polymer coating to a predetermined and controlled depth from a first facial surface. Another object of this invention is to provide a general method to surface modify porous membranes with a free radical polymerized polymer coating into a pattern on one or both facial surfaces, the pattern maintaining its form to a controlled depth into the membrane. Membrane modification is spatially controlled through the use of a polymerization preventing agent (PPA), which prevents modification from occurring in defined spatially volumes of the membrane. The invention relates to porous membranes surface modified by the methods described.
Abstract:
An optical film laminate which is less apt to have adhesive deficiencies or cause adhesive soils. The optical film laminate comprises an optical film layer 1 and a pressure-sensitive adhesive layer 3, wherein non-tacky powders 5 are adhered to edge surfaces of the pressure-sensitive adhesive layer.