PatentsAL ER J A process for obtaining a multilayer composite textile structure containing nonwoven fibrous sheets (2, 3) between which is incorporated a reinforcing structure consisting of continuous yarns or filaments (5), the various constituents being bonded together by mutual entanglement of the fibers of the sheets. According to the invention, two nonwoven sheets (2, 3) are produced in which the elementary fibers are arranged preferentially in the length direction. Between these two sheets (2, 3) there is incorporated a sheet (4) of weft yams (5) which are arranged transversely, at a distance from each other. The sheet (4) of weft yarns is produced immediately upstream of the line of junction (6) between the two nonwoven sheets (2, 3), and downstream of this zone of junction (6) the composite formed is subjected to the action of a mechanical treatment which makes it possible to implant the fibers of one sheet (2) within the other sheet (3) (and optionally vice versa). The homogeneous composite is then reeled up.
Reinforcing material which does not have a melting point which is compatible with the processing temperature of an elastomer can be incorporated into the elastomer in the form of melt blown fibers. In the method of the invention, melt blown fibers are made by melting a reinforcing material in an extruder, and extruding the reinforcing material through a die comprising many small holes, while simultaneously blowing air or nitrogen, under high pressure, through the die holes, and collecting the resulting material on rotating rolls. The fibers thus formed are mixed into an elastomer using conventional mixing means. A composite made by the method is also provided.
5437899 STRUCTURAL ELEMENT FORMED OF A FIBER REINFORCED THERMOPLASTIC MATERIAL AND METHOD OF MANUFACTURE Quigley Peter Cataumet, MA, UNITED STATES Assigned to Composite Development Corporation
5397527 HIGH MODULUS POLYESTER YARN FOR TIRE CORDS AND COMPOSITES Rim Peter B; Nelson Charles J; Mohajer Yousef; Young John A Midlothian, VA, UNITED STATES Assigned to AlliedSignal Inc Yarns are prepared by spinning PEN or other semicrystalline polyester polymers made from similarly rigid monomer combinations to a state of optimum amorphous orientation and crystallinity. This is accomplished by selection of process parameters to form an undrawn polyester yarn of birefringence at least 0.030. The spun yarn is then hot drawn to a total draw ratio of between 1.5/l and 6.0/l with the resulting drawn semi-crystalline polyester yarn having Tg greater than 100 degrees C. and a melting point elevation at least 8 degrees C. The preferred yam has a tenacity at least 6.5 g/d, dimensional stability (EASL+ Shrinkage) of less than 5 % , and shrinkage 4 % or less. The resulting yarn exhibits surprisingly high modulus and tenacity together with low shrinkage when compared to prior art yams.
A structural member of fiber reinforced composite material suitable for secondary processing and a method of processing is described. The structural member before secondary processing is typically a multi-ply tube, rod, or sheet formed with an outer sheath of fiber reinforced thermoplastic material having a melting temperature tml and an inner core material, also fiber reinforced thermoplastic, having a melting temperature, tm2 lower than tml. The member, prior to secondary processing, is thermoplastic. In a secondary process the member is heated to a temperature between tml and tm2, but sufficient to render the outer sheath malleable. The member is deformed to a desired geometry, such as a helix, and cooled to a hardened state.
5439541 METHOD FOR PRODUCING AND USING CROSSLINI(ED COPOLYESTERS Economy Jame Urbana, IL, UNITED STATES Assigned to The Board of Trustees of the University of Illinois
5397519 METHOD OF INCORPORATING REINFORCING MATERIAL INTO AN ELASTOMERIC MATRIX Majumdar Ramendra Hudson, OH, UNITED STATES Assigned to The Goodyear Tire & Rubber Company
This invention provides crosslinked copolyester adhesives, rigid foams, protective coating, matrices for composites and dielectric for electrical circuits, and methods for making crosslinked copolyester adhesives, rigid foams, protective coatings, matrices for composites and dielectrics for electrical circuits. Two or more adherends may be bonded together using a crosslinked copolyester adhesive by first combining at least one oligomer having carboxylic acid end groups with at least one oligomer having ester end groups,
COMPOSITES
PART A Volume 27 Number 1 1995
77