Abstract: The blow-molded hose of a synthetic resin of the present invention is produced by blow-molding a single parison comprising a soft resin and a hard resin. The blow-molded hose comprises a monolayer (or single-layer) segment formed with either a soft resin layer or a hard resin layer and multilayer (laminating) segment formed with the soft resin layer and the hard resin layer, wherein, in the multilayer (laminating) segment, the thickness of the resin layer forming the monolayer segment is thinner than that of the other resin layer. Practically, the monolayer segment comprises the soft resin layer and forms the connection end (s) at the end (s) of the hose.

Abstract: A hose comprises a hose wall comprising a soft synthetic resin and a hard spiral reinforcement fused with or bonded to the hose wall for retaining the hose configuration. The hose wall comprises at least one layer of a chlorine-free thermoplastic elastomer such as a polystyrenic thermoplastic elastomer, a polyolefinic thermoplastic elastomer and a polyurethane-series thermoplastic elastomer. The reinforcement comprises a hard wire and a covering resin layer formed on the hard wire. The hose wall and the covering resin layer are formed with the same series elastomer. This hose is lighter and free from PVC resins, and has the same flexibility as that of the conventional PVC hoses.

Abstract: An air intake duct comprising a main body with bellows which is made by blow molding soft resin and ring-like reinforcements made of hard resin. As the soft resin, a material which is capable of keeping a form of a tube by itself is adopted. The reinforcements are previously mounted on the internal surface of a blow molding die and unite with the bellows in the main body in blow molding.

Abstract: A flexible hose 1 of the present invention is formed by blocking and interrupting a spiral groove 5 inside a hill 2 of a corrugated hose end portion 1a or 1b (inner surface helical concave portion) to form a closed section 4, or by blocking and interrupting a spiral groove 5 formed outside a valley 3 of a corrugated end portion 1a or 1b of a hose (outer surface helical concave portion) to form a blocked section 4. The flexible hose of the present invention can provide an improved air tightness when connected to a joint, requiring no troublesome steps or treatments.

Abstract: A heat insulated hose includes a cylindrical member. This cylindrical member is formed by helically winding a laminated tape having a base layer of a foamed resin, a permeable coat film laminated on an inner surface of the base layer, and an air-tight coat film laminated on an outer surface of the base layer, with adjacent side edges thereof abutted against each other. A resin reinforcing member is helically wound on an outer peripheral surface or inner peripheral surface of the cylindrical member in a manner striding over the adjacent side edges of the laminated tape. The respective side edges of the laminated tape is thermally fused with the resin reinforcing member, thereby integrally joining between the adjacent side edges.

Abstract: A laminated tape comprising a main layer of a polyester-series thermoplastic polyurethane resin and a covering layer formed of a soft vinyl chloride resin fused with at least one surface of the main layer is spirally wound, and its adjacent side edges are bonded each other to form a hose wall. The shrinkage ratio of the length of the hose in an unloaded condition is 25% or less relative to the original length of the hose as determined by measuring the original length and the length of the hose after the test which comprises subjecting the hose compressed in a longitudinal direction to ten heating/cooling-cycles successively, one cycle comprising a heating step for exposing the compressed hose to an atmosphere of 70.degree. C. for two hours and a cooling step for cooling the heat-treated hose at an atmosphere of -20.degree. C. for two hours, followed by returning the temperature of the hose to an ordinary or room temperature and allowing the hose to stand for one hour.

Abstract: The flexible hose comprises a bellows hose wall 1 composed of an inner wall 2 and an outer wall 3 each made of a soft resin and a spiral hard reinforcement 4 interposed therebetween. As the hose contracts, a spiral groove 7 is formed inside of the hose. The inner wall 2 is not partially bonded or fused with the outer wall 3 and the hard spiral reinforcement 4 to form unbonded sites or fragments 8. As the hose contracts, the unbonded fragments 8 are separated from the outer wall 3 and the spiral hard enforcement 4 and move to the inward direction of the hose, and close the spiral groove 7. Therefore, even a fluid flows to any longitudinal direction, the flexible hose reduces a flow resistance.

Abstract: A flexible hose which is formed by attaching a resin reinforcing coil member to a cylindrical body, the cylindrical body being composed of a nonwoven fabric layer which is formed by winding a nonwoven fabric tape spirally and connecting adjacent side end portions and an air-cut layer which forms on at least one side of the nonwoven layer. The nonwoven fabric tape and the reinforcing coil member are formed of heat-fusible resin materials, and the reinforcing coil member is fused with the nonwoven fabric layer in a body.

Abstract: The case of an intake silencer system includes a first case half and a second case half coupled to each other at mating faces, with an intake duct clamped between the mating faces. The intake duct opens into a resonant chamber within the case, so that noise is damped by a resonant effect. Three ribs are provided on an inner surface of the first case half, thereby defining four subsidiary silencing chambers each functioning as a side branch for producing a resonant effect to obtain a silencing effect in a wide frequency range. The ribs also contribute to an enhancement in rigidity of the wall surfaces of the case.

Abstract: A flexible synthetic resin tube is provided by uniting an inner layer of a polyether-series thermoplastic polyurethane resin with a hard synthetic resin spiral reinforcement (e.g. a hard vinyl chloride resin) or a soft synthetic resin outer layer (e.g. a soft vinyl chloride resin), through an interposed adhesive intermediate resin layer. The polyurethane resin includes a resin having a diol composed of a tetramethylenoxy unit as a polyol component. The spiral reinforcement may be buried in the outer layer. The intermediate resin layer may comprise a mixture of the polyether-series thermoplastic polyurethane resin, and the synthetic resin for the spiral reinforcement or the outer layer. This tube imparts an enhanced hydrolysis-resistant property to the polyurethane resin forming the inner layer, and an improved adhesive strength between the inner layer and the spiral reinforcement or the outer layer.

Abstract: An abrasion resistant composite hose comprises (a) an outer layer composing a spiral tape of a soft synthetic resin, where adjacent side edges of the spiral tape join each other to form the outer layer, (b) a spiral reinforcement of a hard synthetic resin for retaining and reinforcing the outer layer, and (c) an inner layer comprising a spiral strip formed by a rubber, where adjacent side edges of the spiral strip join each other to form the inner layer, and the outer layer and inner layer join each other. In such a composite hose having this structure, at least a periphery of the strip except an exposed surface to an inner surface of the hose is covered with a covering element comprising a rubber adhesive to the soft synthetic resin constituting the outer layer, and the rubber strip is formed by a rubber having higher abrasion resistance than the covering element to obtain a composite hose having enhanced abrasion resistance.

Abstract: A rod 3 is driven forward to open an annular slit 5 between a die 2 and a mandrel 4 and the molten resin in a resin accumulation chamber 10 is expelled from annular slit 5 to form a parison. In this operation, the die 2 is displaced from an original position adjoining to the mandrel 4 (axially aligned position) upon opening of the annular slit 5 to correct for any variation in thickness of parison P to be extruded from the annular slit 5. Then, the molten resin accumulated in accumulation chamber 10 is expelled from annular slit 5 to form parison P. The die 2 is then reset to the original position to bring the die 2 and mandrel 4 into axial alignment. Therefore, as the rod 3 is driven back, the annular slit 5 can be closed tight by the mandrel 4 to prevent resin leakage. After closure of the annular slit 5, molten resin is accumulated again in the accumulation chamber 10 and the annular slit 5 is opened. This procedure is repeated to produce parisons on an intermittent basis.

Abstract: A method of manufacturing hollow resin products which are curved two-dimensionally or three-dimensionally. The method includes extruding a tubular parison from an extruder at a constant speed and cutting the parison at a specified length; receiving the parison extruded from the extruder into a conveyer having a feeder which is driven at the same speed as the extruding speed of the parison; maintaining the parison in the conveyer by stopping the feeder temporarily; feeding a leading portion of the parison to a trailing portion thereof successively through an outlet of the conveyer into a cavity of a lower mold of a blow molding machine by driving the feeder, the cavity being curved two-dimensionally or three-dimensionally; and closing the lower mold with an upper mold of the blow molding machine and blowing compressed gas into the parison in the blow molding machine.

Abstract: An apparatus for manufacturing hollow resin products. The apparatus includes an extruder for extruding a tubular resin material and cutting the material into a parison with a specified length; a blow molding machine having an upper mold and a lower mold which form a cavity of a specified shape inside; and a parison delivering machine for receiving the parison from the extruder and feeding the parison into the cavity of the lower mold. The parison delivering machine includes a conveyer which has parison feeder for feeding a parison longitudinally from an inlet to an outlet, a driver for driving the feeder, and at least four shafts which serve as pivots of three-dimensional movement of the conveyor.

Abstract: An apparatus for manufacturing a hollow synthetic resin product, including a movable parison guide and a movable lower molding portion which align an extruding head, the parison guide and an end of the lower molding portion in a perpendicular plane. The lower molding portion is moved in a direction perpendicular to the perpendicular plane while a parison is extruded from the extruding head, while the parison guide is moved in a direction crossing the moving direction of the lower molding portion in accordance with a shape of a groove of the lower molding portion to accommodate a first portion of the parison in the groove. A cutter cuts the parison in a predetermined length when the predetermined length thereof is extruded, while a parison pinch holds a portion of the parison to be cut immediately before the parison is cut.

Abstract: The method includes moving a parison guide and a lower molding portion to substantially vertically align an extruding head, the parison guide and an end of the lower molding portion. Then, the lower molding portion is moved substantially horizontally while extruding a parison from the extruding head, while the parison guide is moved laterally in a direction crossing the moving direction of the lower molding portion in accordance with a shape of a groove of the lower molding portion to accommodate a first portion of the parison in the groove. Subsequently, the parison is cut into a predetermined length when the predetermined length thereof is extruded, while a portion of the parison to be cut is held by a parison pinch.

Abstract: A hollow synthetic resin product manufacturing apparatus with an extruder having an extruding head for extruding a parison and a mold formed of lower and upper molding portions respectively having grooves, a cutter for cutting the parison extruded from the extruding head into a specified length, a robot having a hand for holding the parison at one point of the parison, and a control unit for moving the hand holding the above portion of the parison so that the parison be accommodated in the groove of the lower molding portion.

Abstract: A folding, bellows type, hose of synthetic resin includes a coil to from the chevrons thereof. The modulus of elasticity in bending of the synthetic resin hose wall is in the range of from 2.500 to 14.00 Kg/cm. The oblique portions of the hose wall is attached to the coil on one side thereof near a valley, and on the other side thereof near the crest of the chevron, throughout the whole length of hose.