Abstract: A frame, a drive mechanism for rotating a mandrel, at least two spindles mounted to the frame, a tensioner, and a belt extending between the first and second spindles may be used to roll pre-preg strips or similar sheets of composite materials around the mandrel. The belt travels over the spindles, and the spindles guide the belt through changes in its direction of travel. The mandrel is mounted in the drive mechanism in contact with the belt, which changes its direction of travel around the mandrel. The lower surface of the belt bears against upper portions of the spindles, and the mandrel contacts the upper surface of the belt. As the drive mechanism rotates the mandrel, pre-preg sheets are fed between the mandrel and the belt and are thereby wrapped around the mandrel. The belt presses the pre-preg sheets against the mandrel. The wrapped mandrel may then be removed from the apparatus and cured in any suitable manner known in the art to produce a composite tubular article.

Abstract: An insulated flexible air duct comprises a flexible cylindrical core; a layer of fibrous insulation blanket surrounding the flexible core and comprising a strip of fibrous blanket helically wrapped about the flexible core with lateral portions of successive convolutions of the insulation strip overlapping so that the air duct can be flexed without forming a gap between the successive convolutions of the insulation strip; and a vapor barrier jacket comprising a strip of plastic jacket film helically wrapped about the layer of fibrous insulation. The insulated, flexible air duct is formed in one continuous operation. As the flexible core is formed it is rotated about its longitudinal axis. The rotating core is fed in an axial direction through an insulation wrapping station and a vapor barrier jacket wrapping station where the fibrous insulation strip is wrapped about the core and the vapor barrier strip is helically wrapped about the insulation to form the air duct.

Abstract: A method and apparatus for facilitating insulation of cryogenic devices such as piping, dewars, tanks, superconducting assemblies and the like. A sleeve having a generally circular cross-section and a diameter slightly larger than the cryogenic device is fabricated from a material preferably having low thermal emissivity and covered with the required thickness of insulation so that what the insulated sleeve with the device installed inside is placed into a housing or jacket the required heat leak from the device when in use is achieved.

Abstract: Method for embodying hollow articles made of composite material including at least one access orifice via winding/laying down fibers on an expansible mandrel, the resulting articles and a recoverable and removable mandrel. The method includes placing preimpregnated fibers on an expansible, extractable mandrel having a longitudinal axis by at least one of winding and laying down the preimpregnated fibers on the mandrel, the placing of circumferential fibers of the preimpregnated fibers comprising placing the circumferential fibers at an angle to approach or reach 90.degree. with respect to the longitudinal axis and to form on the mandrel a sinuous line and/or plural, discontinuous elements, so as to enable the preimpregnated fibers to be expanded circumferentially during radial expansion of the mandrel; and expanding the mandrel inside a shaper while polymerizing the preimpregnated fibers.

Abstract: The present invention relates to a hybrid prepreg having reinforcing carbon fibers and foreign fibers. The carbon fibers have a diameter ranging from 5-30 microns and are unidirectionally arranged. The foreign fibers are composed either of single monofilaments having a diameter ranging from between about 50-150 microns or of strands formed by bundling together a plurality of single monofilaments having a diameter ranging from between about 5-50 microns. If strands are employed, they have a conversion diameter (D.sub.0) which is less than about 500 microns. The conversion diameter (D.sub.0) is represented by the following equation: ##EQU1## wherein n is the number of monofilaments used in forming the strand, and wherein d is the diameter of these monofilaments. Examples of foreign fibers which can be used when practicing this invention include boron fibers, metal fibers and organic fibers.

Abstract: An endless belt in which a fibrous material is dispersed in a substantially uniform manner all over an endless elastic body layer is provided. A non-woven tape is impregnated with a polyurethane elastomer material liquid and wound and layered on a supporting belt, and then, after curing the polyurethane elastomer material liquid to form an elastic body, it is removed from supporting belt.

Abstract: A paper web having a longitudinally extending zone coat of adhesive is continuously wound around the cylindrical surface of a rotating drum for a selected number of wraps to form a multi-layer cylindrical master stack. Web tension is controlled during winding to cause each succeeding wrap to be placed in relatively greater tension, so that when the completed cylindrical stack is cut transversely and unwrapped from the drum, equalization of the tensile stresses in the web wraps results in a flat master stack of rectangular sheets of equal length. The stack is further processed by cutting along transverse and longitudinal cut lines to form individual pads of adhesive-backed notes. Tension control may be based directly on the increase in drum radius resulting from the buildup of web wraps or by maintenance of print pattern register between continuous equally spaced print patterns in overlying wraps.

Abstract: A paint roller having a tubular core formed of thermoplastic material. The thermoplastic material being in the form of a multiplicity of spirally wound plies. The multiplicity of plies comprising an outer ply surrounding and in continuous contact with an inner ply. The plies are in general parallelism with one another and fused to one another in the absence of adhesive. A fabric cover overlies the core and is heat fused to the underlying core in the absence of adhesive.

Abstract: A helically wound tube made of at least two sheets of preperforated flat roll paper material. Each sheet is helically wound in edge abutting relation such that one longitudinal edge of the sheet abuts the other longitudinal edge of the sheet to form a ridgeless seam. Some of the perforations of the subsequently wound sheets overlap some of the perforations of the previously wound sheets to form a reinforced cylindrical tube having perforations that permit radial flow through the cylindrical tube.

Abstract: An elongate transfer tape includes a water-resistant removable top and bottom liner with two adhesive strips, one water soluble, the other water resistant, side-by-side in a plane between the liners. Above the water resistant adhesive is a water absorbent pad that when forced against paper will weaken the paper by the forced expulsion of water from the pad. The paper will attach to the tape and be drawn to a collecting spool to which the tape is attached. The paper will break along its weakened portion. The pad is constructed to hold water against the centrifugal forces that derive from the rotating collecting spool to which it is attached via the water resistant adhesive.

Abstract: A tubular structure, such as a pipe or pressure vessel, is provided with a wall formed from plastic, composites and elastomeric materials. The composite materials are spirally wound and are separated by elastomeric strips. The wall has an inner wall element formed by a continuous flexible plastic cylinder with a spiral projection on its outer surface. An outer layer is formed from alternating spirally wound strips of composite and elastomer. The composite strip has a radially inward projection axially spaced from the projection on the plastic cylinder but overlapping in the radial direction. The cylinder and layer are separated by an intermediate layer formed from composites and elastomeric strips. A composite strip is located between each pair of adjacent projections and separated from the projections by an elastomeric strip. An outer wall element is formed from alternating spirally wound composite and elastomeric strips having pitch greater than the inner wall element.

Abstract: A process for the manufacture of tubes made of fluoro resin, especially of polytetrafluoroethylene, which can be employed especially as corrosion-resistant coatings for piping components, in particular those made of steel, for conveying chemical products.

Abstract: A method for manufacturing the shaft unit of a golf club includes the following steps: (1) providing a shaft which has a first end surface, a second end surface, and a cross-sectional area that increases gradually from the first end surface to the second end surface; (2) providing an elongated first-layer sheet which is made of resin, and which has two inclined end surfaces that are parallel to each other and several fibers that are evenly coated on the sheet that extend along the length of the sheet; (3) winding the sheet on the shaft in a clockwise direction from the first end surface to the second end surface of the shaft in such a manner that one of the end surfaces of the sheet and the first end surface of the shaft are on a similar plane and that the fibers of the sheet form an angle of about 48.+-.3 degrees with respect to an axis of the shaft so that, when the first-layer sheet is wound to the second end surface of the shaft, the fibers of the first-layer sheet form an angle of about 19.+-.

Abstract: A composite structure of elastic and viscoelastic components in which dynamic loads are effectively damped by transmission through the viscoelastic components. The structure includes a continuous sandwich comprised either of a single elastic layer enclosed by two viscoelastic layers or of a single viscoelastic layer enclosed by two elastic layers such that the sandwich has little stiffness in any intended direction of loading, and two segmented elastic layers having stiffness in a desired loading direction. The segmented layers have alternating segments and gaps and are disposed one on each side of the viscoelastic layer in such a manner that the gaps of one segmented layer overlap the segments of the other segmented layer. Dynamic loads in the loading direction are transmitted back and forth from one segmented layer to the other, through the continuous sandwich layer containing the viscoelastic material, which thereby provides a high degree of damping.

Abstract: A tape wrap system adapted for protecting metal tubular articles, particularly pipes, from corrosion comprising in order, a primer coating covering the surface of the article, an innerwrap over the primer coating and an outerwrap placed over the innerwrap, the innerwrap comprising a polyolefin layer carrying an adhesive layer on its inner surface and a layer comprising a heat fusible material on its outer surface, or a single layer comprising a blend of a polyolefin and a heat fusible moiety carrying an adhesive layer on its inner surface, the outerwrap comprising an impact-resistant polyolefin layer having a heat fusible layer on both surfaces or the inner surface thereof, or a single layer comprising a blend of an impact resistant polyolefin and a heat fusible material; the tape wrap system fusing the innerwrap and outerwrap together when heated and thereafter cooled to form a uniform, continuous and completely closed protective coating which fully protects the article against corrosion and other external d

Abstract: An insulating tape for winding coils which includes a guide sheet having a predetermined width and a plurality of narrow insulating strips provided with adhesive on both surfaces thereof and removably connected to the guide sheet at predetermined spaces, facilitating accurate winding of insulating strips on a bobbin or the like and further enabling the winding operation to be carried out automatically.

Abstract: A fiber drum and the method of making the same having a detachable lining fabricated therewith but removable therefrom after a first use to allow for the reuse or recycling of the drum.

Abstract: A reusable tape for effectively securing hockey equipment against shifting of the equipment during play. The tape is designed to be wrapped over the equipment and around the leg in precisely the same manner as is disposable adhesive athletic tape when used for this purpose. The tape is further designed to enable it to be measured and cut to particular lengths, so that it duplicates the precise functioning of whatever particular lengths of adhesive athletic tape is normally preferred by each player.The tape consists of an elongated, rectangular strip of vinyl from 30" in length to 240", in widths of 1" to 11/2", in different solid colors to match team uniforms, including white, black, and clear.

Abstract: A stationary mandrel (1) is wrapped in a separating film (3) at the front, as seen in the draw-off direction (A). A gel coat layer is coated onto the film (3) and partly gelled by means of a heater (12). The gel coat layer is coated with liquid polyester, wrapped in a longitudinally extending glass-fibre fabric (20) in an overlapping manner and wound helically in a glass sliver (21). These layers are hardened by means of a further heater (24,25), so that a structural supporting profile for coating on the following layers is obtained. The mandrel (1) is set off after the further heater (24,25). For coating on the further layers, liquid polyester, a fibre fabric (34) and a helically wound sliver (37) are applied alternately. These layers are fulled and coated with an outer gel coat layer. The polyester is hardened in an oven (50). A grab device (52) draws the section off continuously from the mandrel (1). Finally, the section is cut to length.

Abstract: A link assembly for a lightweight, non-metallic, conveyor or load transmission chain having significantly greater strength and other performance improvements compared to previous non-metallic chain links is disclosed. Each link assembly includes: a pair of identical sidebars each comprised of high-strength filamentary material wound in an elongated loop configuration and fixed in a matrix of hardened resin; a connecting pin having a stiff reinforced composite core and a skin-tight sleeve of non-abrasive material; low friction bushing means between the sidebars and connecting pin; and retaining means for holding the assembly together.Methods of making the unique sidebar and connecting pin components are also disclosed.

Abstract: A method and apparatus for producing flexible tubes of desired length from several strips of rubber and/or fiber reinforced rubber. The apparatus comprises a wrapping machine and a vulcanizer arranged in series on a common axis along which a core can move.

Abstract: Reinforced composite tubes having integral tapered ends are formed on mandrels which are tapered at each end. Reinforcement fabric is first conformed to the mandrel with at least one end of the fabric structure retaining an opening therein. The mandrel is disassembled and removed through the opening, and a matrix cured within the fabric to produce the desired composite. Usually, the fabric structure will be cured in an external mold with an inflatable mandrel inserted through the opening applying internal pressure.

Abstract: An apparatus for laminating at least two strips of strip material and forming the laminate into lightweight, thin-walled tubular members that may be used in the construction of non-combustion smoking articles.

Abstract: Process for the manufacture of a tube for an expansion shaft. A plurality of fiber strata, each consisting essentially of long continuous fibers, and at least one layer of honeycomb material, the fiber strata and the layer(s) of honeycomb material being in alternating sequence forming are a sandwich compound, are applied to a mandrel having moldings or projections thereon. The fiber strata are applied so that few if any fibers are severed by the moldings. The tube has apertures, which are formed by the moldings. In order that the necessary openings do not weaken the structure of the carbon fibers, they are placed around the moldings forming the apertures and afterwards the sandwich compound is saturated with epoxy. The remarkable feature of the tube is the extremely light weight and the resulting advantages especially with regard to its handling.

Abstract: An apparatus for continuous manufacture of bent rods having a shaped cross section from a reinforced stabilizing material, produced inside a supporting mold wound on a mandrel and containing reinforcing elements impregnated with stabilizable material. The material is stabilized over at least a portion of a length of the mandrel, with the bent rods being adapted to be used in reinforcements for flexible tubing.

Abstract: The present invention relates to a unique fiber-reinforced metallic tubular element, along with a unique method for producing such tubular elements on a production basis. The tubular element includes a cylindrical aluminum tube surrounded by a fiber composite sleeve which includes a plurality of individual reinforcing graphite fibers oriented parallel to the longitudinal axis of the tube and uniformly positioned about the circumference of the tube. In the preferred embodiment of the invention, an isolation layer is positioned between the graphite reinforcing layer and the outer surface of the aluminum tube, and a protective covering layer of fiber material surrounds the tube and is adhered to the outer surface of the graphite reinforcing layer. In the preferred method of the present invention, a plurality of cylindrical metal tubes are coupled to one another in an end-to-end relationship by a plurality of joining plug members to form a longitudinally extending series of metal tubes.

Abstract: A method and apparatus for forming expandable and collapsible shielding material wherein adhesive is applied to one side of a flat tubular strip which is wound around support wheels, the adhesive bonds together successive layers of strip to form a continuous loop of stacked strip. During the winding of the strip, the strip is maintained in a flat, straight condition for a time sufficient to allow the adhesive to achieve an initial set, thereby preventing the final product from having a curved set. After the desired number of layers are wound into the loop, the loop is removed and cut through at one point to form a single, straight stacked section of definite length which is expandable and collapsible to form a shielding or insulating material having parallel hollow cells running perpendicular to the direction of expansion and collapse.

Abstract: A composite golf club shaft and the method of constructing the shaft is disclosed. The hollow circular shaft includes a standard butt end having a constant outside diameter along a length of the shaft and a tip end having a constant outside diameter sustantially larger than the tip of a standard shaft, with the constant diameter of the tip end and butt end extending along predetermined lengths of the shaft. An intermediate section of the shaft tapers between the diameters of the butt and tip ends. The shaft is manufactured by wrapping a group of circumferential sections about a mandrel, each layer comprising either standard modulus carbon-graphite fibers or fiberglass fibers in a matrix, with the finished product being heat-cured to produce a golf club shaft.

Abstract: A roll-like article has a core and a sheet roll wound around the core so that both side portions of the core projects from both side faces of the sheet roll. A leading end of a wrapping sheet material is fixed to the outer surface of the sheet roll and a leading end of a side face sealing material is fixed to the outer surface of each side portion of the core in a position angularly deviated in one direction from the position in which the leading end of the wrapping sheet material is fixed to the outer surface of the sheet roll. The article is rotated around the core in said one direction by a predetermined angle so that the wrapping sheet material is wound around the sheet roll and the side face sealing material is wound around the core. Each of the side edge portions of the wrapping sheet material projecting from the side faces of the sheet roll is folded along the side face of the sheet roll and the outer portion thereof is pressed against the core.

Abstract: A golf club shaft comprises a laminated tube constituting a main body of the shaft which is wound around the outer periphery of a mandrel, a transparent metallic layer wound around the outer periphery of the laminated tube and a resin coat such as epoxy resin formed on the outer periphery of the transparent metallic layer. The laminated tube is composed of a plurality of cloth prepreg sheets having different fiber orientations when wound around the mandrel. The transparent metallic layer is composed of a cloth prepreg sheet and a metallic surface. The cloth prepreg sheet is formed of a cloth of organic and/or inorganic fibers, which is made transparent after molding treatment, and formed by plating or depositing, on one surface of the cloth, metal such as titanium or the like and by impregnating epoxy resin or other thermosetting or thermoplastic resin into the thus formed cloth.

Abstract: This invention relates to a process and a machine for manufacturing a tubular piece from at least one web of supple material, the machine comprising a mandrel around which the or each web is capable of being helically wound, and means for driving by friction the or each web wound around the mandrel, parallel to the longitudinal axis of the mandrel. According to the invention, the or each web being constituted by a resistant reinforcement bonded at least on the surface to a polymerizable product, heat regulation means are provided in the zone of said drive means.

Abstract: A technique for forming a pipe flange having radial reinforcement in at least the annular portion of the bolt circle uses a specially woven band of fibers. The woof fibers in the band are longer than the width of the warp fibers so that as the band is wound into the slot of a mandrel, the tails of the woof fibers bend and extend in a radial direction.

Abstract: A process for producing a tube having a strength imparting tubular body and a tubular lining member covering and bonded to the inner surface of the tubular body comprises the steps of forming mandrel contact portions on a synthetic resin surface of a lining sheet in the form of a strip and noncontact portions in the surface distributedly among the contact portions, helically winding the lining sheet around a mandrel with the synthetic resin surface positioned inside and with the sheet lapping over itself, bonding the lap to the underlying portion of the wound sheet to form the lining member, and moving the tubular lining member axially of the mandrel in a direction to remove the member therefrom. The lining member formed around the mandrel is smoothly movable axially thereof by virtue of the presence of the contact and noncontact portions distributedly formed over the sheet resin surface.

Abstract: This invention relates in general to fabricating fiber-reinforced membranes sing elastomeric materials and, in particular, to a filament winding process suitable for fabricating flexible fiber-reinforced membranes for inflatable depolyable or expandable structures capable of sustaining high structural loads or providing thermal insulation to the structure. The invention relates especially to a filament winding process for fabricating a flexible membrane which may be inflated to provide a conically shaped deployable nose fairing for a missile.

Abstract: Methods are provided for lining and wrapping both interior and exterior surfaces of tubular structures with materials that protect the underlying structures from adverse environmental conditions, provide a thermal control coating and prevent exchanging moisture with the surrounding environments. The methods use adhesives to securely position the lining or wrapping material inside or around the exterior of the tubular structure. The adhesives prevent the formation of discontinuities in the protective layer provided by the lining or wrapping material by holding the protective materials in place during the fabrication process. The wrapping materials are sealed by an ultrasonically welded seam to prevent environmental attack through the seam to the underlying tubular structure.

Abstract: A golf club shaft of increased playability and feel is manufactured with a generally hollow and tapered cylindrical wall comprised of a plurality of layers of fibers and a resin binding the plurality of layers of fibers together into an integrated structure. The shaft includes a portion of constant outer diameter adjacent one end adapted to accept a grip and a portion of a smaller constant diameter adjacent the other adapted to be fitted to the hosel of a club head and a portion intermediate the two end portions with a uniformly tapering diameter. The golf club comprises a plurality of layers of fibers arranged and oriented within the shaft to resist torsional deflection and to provide a controlled and variable flexural resistance, permitting the player to recover energy stored in the shaft during the swing and to apply that energy to the ball for greater distance. The inner and outer layers of fibers include fibers running both perpendicular and parallel to the longitudinal axis of the shaft.

Abstract: A method is provided for continuously manufacturing a synthetic resin tube. A plurality of pre-molded flat strips of synthetic resin material is passed through a heating zone to soften the strips. Then, the strips thus softened composed of a first strip for forming an outermost tube wall, a second strip for forming an innermost tube wall and at least one intermediate strip for forming an intermediate tube wall sandwiched between the first and second strips are fed to a mandrel comprising a plurality of rotating rollers arranged in a circular array and rotatably journalled in an end plate. The strips fed to the mandrel are wrapped around and advanced axially along the length of the mandrel with portions of adjacent turns of the intermediate strip not overlapping each other. The strips thus wrapped around the mandrel is then pressed by a pressure roller so as to be joined and welded to form a tube.

Abstract: A flexible fishing rod is described having a cross section which tapers from a large butt end to a small tip end. The rod has a hollow section extending along the rod axis from the butt end to a solid tip section formed by compression of the pattern used to make the rod.

Abstract: A method of manufacturing a plastic pipe having a spiral ridge on an outer surface and a flat inner surface, comprising the steps of: (a) supplying a plastic ribbon in a softened state onto a plurality of rotating forming rolls arranged circularly, so that the plastic ribbon is spirally wound around the forming rolls while partially overlapping to be fused with each other; (b) spirally winding an endless forming core belt around the forming rolls in such a manner that the endless forming core belt is sandwiched between the plastic ribbon already wound around the forming rolls and the plastic ribbon newly supplied, thereby providing the resulting plastic pipe with a spiral ridge; (c) cutting the spiral ridge after the plastic ribbon is fused with each other and sufficiently cooled, thereby providing the spiral ridge with a slit extending along it to remove the endless forming core belt from it; and (d) winding a second plastic ribbon in a softened state around the spiral ridge to fuse the second plastic ribbon

Abstract: A method for making a belt for use in papermaking includes a series of steps. A sheet of uncured urethane is wrapped on a polished mandrel. A woven fabric sleeve to serve as a supporting carcass is placed over the first sheet and shrunk onto it. A second sheet of uncured urethane is placed over the woven fabric sleeve. A nylon web is wrapped tightly around the second layer and the entire wrapped mandrel is heated, curing the urethane sheets and entirely bonding the sheets to encapsulate the fabric sleeve. The nylon wrap is removed and the surface of the cured urethane is ground.

Abstract: A golf club shaft of increased playability and feel is manufactured with a generally hollow and tapered cylindrical wall comprised of a plurality of layers of fibers and a resin binding the plurality of layers of fibers together into an integrated structure. The shaft includes a portion of constant outer diameter adjacent one end adapted to accept a grip and a portion of a smaller constant diameter adjacent the other adapted to be fitted to the hosel of a club head and a portion intermediate the two end portions with a uniformly tapering diameter. The golf club comprises a plurality of layers of fibers arranged and oriented within the shaft to resist torsional deflection and to provide a controlled and variable flexural resistance, permitting the player to recover energy stored in the shaft during the swing and to apply that energy to the ball for greater distance. The inner and outer layers of fibers include fibers running both perpendicular and parallel to the longitudinal axis of the shaft.

Abstract: A roller is characterized by an inexpensive and disposable construction for use in transporting and applying developer material in a developer system of a xerographic copier machine, and a method of fabricating such rollers. The rollers have an outside electrically-conductive surface for transporting and applying developer material and are constructed of a tubular fiber core, preferably spirally-wound and laminated paper plies, with an outside surface ply of aluminum foil spirally-wound on and laminated to the fiber core. At least those rollers which are utilized as applying rollers have spaced-apart grooves formed in the outside surface of the roller and formed therein without tearing or cracking the thin aluminum surface ply.

Abstract: The method of making a non-metallic bearing assembly by bonding a first layer of uncured rubber that is wrapped on a mandrel to a fiberglass layer whose outer wrappings are impregnated with epoxy resin. The fiberglass outer layer is cured first to form a rigid outer plastic shell and then the uncured rubber is vulcanized to give an inner rubber sleeve whose inner periphery has polygonal contour which is the cross sectional configuration of the mandrel. An inner layer of fiberglass, cement impregnated, interconnects the fiberglass outer plastic shell to the inner rubber sleeve.

Abstract: A composite container includes a high barrier inner liner member including a metal layer of vacuum-deposited aluminum parallel with and spaced from the longitudinal edge of a synthetic plastic base thereby to define a first web that is helically wound in edge-overlapping relation such that one longitudinal edge of the metal strip overlaps the other longitudinal edge of the metal strip by a given distance (d). The overlapping edges of the first web are hermetically joined by a heat-sealable bond between an adhesive layer covering the metal strip and the adjacent face of the first web, and a compatible heat-sealable layer on the opposite face of the web.

Abstract: High temperature resistant tubes are described, which are useful as heat insulators for thermocouples. The tubes are made of spirally wound, refractory cements reinforced with non-woven webs of ceramic fibers. The tubes are advantageous in that by the method of their manufacture, they are free of significant proportions of organic binders and adhesives which may be volatilized at high temperatures, releasing gases.

Abstract: A tire breaker comprising at least two breaker plies is assembled on a carrier ring which is movable between ply fitting stations.The ring is mounted on an arm which swings the ring through 90.degree. to each fitting station where the ply is supported on a table. Each end of the ply is then moved from the table on to the ring by means of grippers, and rollers then traverse the ring to ensure that the ply is positioned accurately. The joints formed in successive plies are diametrically opposed to one another.

Abstract: Tanks, containers, pipes, etc., of sandwich construction may be manufactured by winding an inner sheet (3) onto a rotating mandrel (1), by then winding a hard insulation (8) which has been softened by heating in a microwave oven (9) onto the adhesive-coated inner sheet, and finally by winding a cover sheet (12) onto the adhesive-coated insulation layer.

Abstract: In the method for manufacturing strings, a plurality of narrow strip layers (22) of synthetic material are successively and coaxially helically wound on the cylindrical surface of a continuous core. The winding (3) thus produced is conveyed hot to a welding area (7) wherein the narrow strips (22) of synthetic material are mutually assembled by welding. The temperature of the welding area is adjusted high enough so that a welding between the narrow strips (22) takes place without substantially decreasing the breaking strength of the narrow strips (22) by such heat treatment. The appropriate materials for the narrow strips are olefines such as homopolymer polypropylene or terpolymer polypropylene-polyethylene-dienes. To reduce the tendency to flow, the material forming the narrow strips may contain a nucleation agent. The characteristics of the strings thus manufactured are similar to those of gut strings.

Abstract: A method of producing a unitary curved structure having a honeycomb core by coating a mold with gel, applying a layer of reinforced fiberglass plastic to the gel to receive, after partial curing, a light layer of chopped glass fibers (about 3/4 ounces/sq. ft.) and a mixture of catalyzed resin and chopped fiber strand. The resulting surface may be rolled to remove bubbles and oversprayed with catalyzed resin. A Raw Kraft paper honeycomb is placed into the wet laminate and completely covered with wax paper weighted with sand bags to approximately 10 pounds per square foot to press the honeycomb into place and seal same. The resin is absorbed in and climbs the honeycomb walls, and heat and styrene gas are liberated into the cells. The bags and wax paper are removed after partial cure, excess styrene fumes are blown away, and the honeycomb is lightly oversprayed with a catalyzed resin.

Abstract: This invention relates to a method of manufacturing a stick (1,1') and to a stick manufactured according to said method.The object of the present invention is to propose a method for the manufacture of a stick, which substantially shall have the same properties as a conventional wood stick. The method according to the invention is characterized in that a core (4,4') of polyurethane foam is formed, that the foam is caused to cure, that a plurality of holes (7,7') are made in the blade portion (3,3'), that at least one longitudinal groove (5,5') is made in the handle portion (2,2'), that a reinforcement strip (8,8') of glass-fibre reinforced polyester is placed in the groove (5,5'), that a tape (9,9') of woven glass fabric is wound about the core (4,4'), that a hose (10,10') of woven glass fabric is threaded on the outside of the tape (9,9'), and that a surface layer of polyester plastic is applied on the core (4,4') with reinforcements.