Abstract: A method of manufacturing fiber reinforced plastics comprising immersing fibers into an immersing tank containing resin, moving the fibers through the immersing tank along a direction in which the fibers are aligned at a speed that is substantially equal to a rate of capillary infiltration of the resin into the fibers, and drawing the fibers into a die to cure the resin.

Abstract: A method of manufacturing fiber reinforced plastics by means of a drawing method having the steps of immersing resins into fibers for reinforcing aligned in one direction, which are supplied continuously, and curing the resins immersed in the fibers by drawing the fibers into a die, is disclosed. In the method according to the invention, the fibers are moved in a resin supply zone at a substantially same speed as that of resin immersing in the fibers along a direction in which the fibers are aligned.

Abstract: An apparatus for applying a primer on an outer surface of a work having rod shape, includes an primer applying portion provided under the work in which the primer is immersed; a cap portion provided detachably to the primer applying portion, which prevents an inclusion of a water component in the air into the primer applying portion; a primer inlet provided to the primer applying portion through which the primer is supplied into the primer applying portion; and a primer outlet which discharges the primer from the primer applying portion in such a manner that a liquid level of the primer applying portion becomes constant in the primer applying portion. In the apparatus mentioned above, the primer is applied on the outer surface of the work having rod shape by rotating and moving the work on the primer applying portion.

Abstract: A primer is thinly and uniformly applied by supplying a primer and a spraying air to a spray gun, in which an amount of the primer to be supplied to the spray gun is controlled, and a solvent for the primer is supplied to the spraying air to be supplied to the spray gun.

Abstract: A method of manufacturing insulators with excellent high-voltage performance having a core member, a sheath arranged on an outer surface of the core member and a shed arranged on an outer surface of the sheath is disclosed. In a first aspect of the invention, a method includes the steps of arranging the sheath made of non-cured polymer materials on an outer surface of the core member, arranging a plurality of the sheds made of cured polymer materials on an outer surface of the sheath, and curing the sheath to connect the sheath to the sheds. In a second aspect of the invention, a method includes the steps of arranging the sheath made of cured polymer materials on an outer surface of the core member, arranging a plurality sheds made of cured polymer materials on an outer surface of the sheath, and connecting the sheath to the sheds by using adhesives.

Abstract: Method and apparatus for manufacturing a composite insulator which includes an FRP core rod covered by a sheath and provided with a plurality of sheds which are made of an electrically insulating polymeric material. The sheds are set on a support member arranged on a downstream side of an extruder. The extruder is fed with a core rod and extrudes a polymeric material to form a sheath on the core rod. The core rod with the sheath is moved toward the downstream side through an opening in the support member. The sheds are sequentially moved along the support member toward the downstream side and transferred onto predetermined locations on the sheath that have passed through the opening and have reached the downstream side. An assembly is thus formed which includes the core rod, sheath formed on the core rod, and sheds transferred onto the sheath. The assembly is then heated to vulcanize the sheath and adhere it to the core rod and the sheds.

Abstract: A method of manufacturing insulators with an excellent high-voltage performance having a core member, a sheath arranged on outer surface of the core member and a shed arranged on an outer surface of the sheath is disclosed. In a first aspect of the invention, a method includes the steps of arranging the sheath made of non-cured polymer materials on an outer surface of the core member, arranging a plurality of the sheds made of cured polymer materials on an outer surface of the sheath, and curing the sheath to connect the sheath to the sheds. In a second aspect of the invention, a method includes the steps of arranging the sheath made of cured polymer materials on an outer surface of the core member, arranging a plurality sheds made of cured polymer materials on an outer surface of the sheath, and connecting the sheath to the sheds by using adhesives.

Abstract: The disclosed method of producing a composite insulator having a core portion, a sheath portion arranged on an outer surface of the core portion, and a plurality of shed portions projected from the sheath portion by using a die and heating the die, includes a step of cooling both end portions of the core portion. In the disclosed method, it is possible to provide a method in which cracks are not generated in the both end portions of the core portion during producing.

Abstract: A composite insulator-producing process including the steps of forming the housing from the housing-forming insulating polymer material and then vulcanized around the outer periphery of the rod-shaped core member by using the mold in the state that the core member is mechanically or thermally expanded by substantially (.delta.-.alpha.) or more in which .delta. is an axially linear expanded length by which the core member would be thermally expanded if the core member is heated to a molding temperature for the housing, and .alpha. is an axially linear expanded length by which the mold would be thermally expanded if the mold is heated to a molding temperature.

Abstract: A composite electrical insulator includes a metal fitting (3, 4) fixedly secured to a fiber-reinforced plastic rod (1) at one end thereof. The rod has a stress-relieved zone (8) situated opposite to the metal fitting (3, 4), and formed by a heat treatment of the rod (1) after an end portion of the rod (1) has been inserted into a bore (5) in the metal fitting (3, 4) and the metal fitting (3, 4) fixedly secured to the rod (1). The heat treatment of the rod (1) is performed at a temperature which is not lower than a heat transition temperature of a matrix resin of the fiber-reinforced plastic material.

Abstract: A process for insulating high voltage conducting media by insulating such media with a silicone rubber composition capable of being converted to a rubbery elastomer superior in high voltage electrical insulating characteristics is provided. The composition comprises the following components (a) to (e) and not containing a platinum catalayst:(a) 100 parts by weight of an organopolysiloxane gum;(b) 10-100 parts by weight of a finely divided silica filler;(c) 15-300 parts by weight of aluminum hydroxide;(d) 1-20 parts by weight of a OH terminated organosilane or organosiloxane oligomer; and(e) 0.05-6 parts by weight of an organic peroxide.

Abstract: A synthetic resin insulator comprising a fiber-reinforced plastic rod provided at its both ends with holding metal fittings; a plural number of overcoats fitting to and covering the plastic rod, each overcoat consisting of an elastic insulating material and provided at its outside with a shed; and a conducting path formed straddling the joint portion of adjacent overcoats flows leakage current through the conducting path, is not eroded at the joint portion of adjacent overcoats, and is very long in the life.