Abstract: A method of manufacturing a golf club head that includes a peripheral shell constituted by an assembly of walls obtained by injecting a plastic material forming an inner cavity enclosing at least one inner insert kept immobilized by a partial plastic material coating of the shell. Prior to the injection step of the shell, an assembly is placed and immobilized in the mold which is comprised of a meltable core made of a second material having a melting point that is lower than the melting point of the plastic material in the space left free between the walls of the mold and the assembly, so as to coat the meltable core and all or a part of the free portion of the insert. Finally, all or a portion of the meltable core is eliminated to enable an inner volume to be freed so as to form the inner cavity.

Abstract: A method of forming a balloon for medical purposes including co-extruding in a tubular shape a base structural layer of polyamides, polycarbonates, polyesters and copolymers thereof and a heat sealable layer of polyethylene and copolymers thereof. The tubular member is then biaxially oriented by inflating the tube with a gas to a predetermined central diameter greater then the initial diameter of the tube and simultaneously heating the inflated tube to a temperature sufficient to biaxially orient the base structural layer. The member is then cooled the inflated tubular member and then elevated in temperature for a second time to the biaxially orienting temperature. The twice-heated tube is allowed to cool and the gas is withdrawn whereby the tubular member will assume a generally tubular shape and the main structural layer will remain biaxially orientated and the heat sealable layer will not be biaxially orientated.

Abstract: The present invention includes processes and resulting structures for producing moisture absorbing desiccant entrained polymers. A polymer is caused to assume a molten state, typically by applying heat and melting the polymer. To achieve certain results in the hardened end product, such as rigidity and durability, the polymer normally acts as a moisture barrier in a solidified state, both before and after melting. A desiccating agent is blended into the polymer so that the desiccating agent is distributed within the polymer. A channeling agent is also blended into the polymer so that it is distributed within the polymer. The blending of the components is preferably done before the polymer is caused to assume a molten state. Together, the polymer, desiccating agent and channeling agent create a blended mixture. The mixture is solidified so that the channeling agent forms passages in the mixture through which moisture is communicable to desiccating agent that is entrained within the mixture.

Abstract: A plunger tool for producing a special prophylactic is disclosed. The special features of the plunger tool reside in the special curvatures in its shaped section. The shaped section of the plunger tool exhibits an extreme narrowing, at the deepest point of which there may be at least one annular groove. Unlike prior art transitions, the transition from the large diameter to the reservoir section is not steep and straight but takes the form of an S-shaped curve. An exact contour of the annular grooves on the surface of the plunger tool is essential for their production and can be done only by the use of a precision diamond abrasive point.

Abstract: A double-walled thermoplastic article includes a double-walled body having inner and outer walls and an insert having visible portions and recessed runner sections. The body includes an insert portion in which its inner and outer walls are contiguous. The insert is attached to the body insert portion such that the visible portions of the insert are exposed and the runner sections are embedded within the insert portion. The article can be produced by a double-walled blow molding process.

Abstract: A method and apparatus for manufacturing a centering, perfusion catheter balloon. A mold member is formed having an axial aperture. A plurality of axially spaced sets of transverse holes through the mold member. Each set of holes includes one or more holes, with the holes in each succeeding set at a predetermined angle to the holes in the immediate preceding set. A tight fitting sleeve is provided around the mold member. A plastic tube is inserted into the axial hole and the assembly is heated and the tube is internally pressurized to cause the tube to expand the tube into the holes, forming outwardly extending knobs on the tube. The tube is cooled and fluid is evacuated from the tube, causing the tube to draw the knobs into the axial aperture to permit the completed tube to be withdrawn. The tube can then be assembled into a treatment catheter assembly with the knobs maintaining a treatment device centered in the balloon while the knobs allow fluid perfusion along the catheter.

Abstract: A ported tubular air duct and a method for manufacturing a side-ported tubular air duct. The air duct has a side port located substantially ninety degrees (90.degree.) to the part line of a mold in which the air duct is manufactured. The mold has two portions which are separated when the mold is opened to permit the positioning a preheated polypropylene tubular port insert member into an opening in one of the mold portions. A parison of rubber modified polypropylene is injected into the mold between the portions at approximately 410.degree. F., and the mold is closed to seal the ends of the parison. The interior of the parison is pressurized to a level in the range of approximately 90 to 100 psi to force the parison outward against the inner sides of the mold cavity and against one end of the port member. At this juncture, the parison has a thickness in the range of 0.060 to 0.090 inches.

Abstract: A process which entails providing a preform formulated of polymeric material formed to permit the introduction of a fluid under pressure into the preform, heating the preform to a temperature at or above the glass transition temperature of the polymeric material and below the melting temperature of the polymeric material, placing the heated preform into a substantially cylindrical mold with a polished seamless inside surface, introducing a fluid under pressure into the heated preform while maintaining the preform axially centered in the mold, thereby causing the preform to expand without contacting the mold surface, subsequently causing the preform to expand until it contacts the mold surface, heating the expanded preform to an appropriate heat setting temperature above the stretching temperature and below the melting temperature of the polymeric material while maintaining fluid pressure, and subsequently cooling the set preform, resulting in formation of a biaxially oriented seamless belt.

Abstract: A method for producing open-ended biaxially oriented containers includes forming a biaxially oriented intermediate by blow forming, without plug assist, a sheet of unoriented thermoplastic material into a forming tube to a depth of draw sufficient for full orientation of the side walls. During blow forming the thermoplastic material is prevented from sticking to the side walls of the forming tube. The blow formed intermediate is placed on a male form a predetermined size, shape and texture. The intermediate is heated above the orientation temperature of the thermoplastic material to heat shrink the intermediate onto the surface of the male form. The formed container is then removed from the male form.

Abstract: A container obtained by biaxially stretch-blow-molding a resin. Except the mouth-and-neck portion, vicinities thereof and the center of the bottom portion, the container as a whole is reduced in thickness under a highly drawing condition without accompanied by whitening, and a portion constituting the bottom valley portions has an yielding load of not smaller than 25 kg/cm at 70.degree. C. The container exhibits excellent heat resistance, pressure resistance, shock resistance as well as self-standing ability.

Abstract: A process for blow molding a hollow plastic product comprises introducing a hollow elongated parison of thermoplastic material between a pair of opened sections of a blow mold, and then closing the mold. The mold sections are closed along a linear direction of travel and, when closed, form a mold cavity including a narrow section extending in the direction of travel. The narrow section has a width less than about twice a wall thickness of the parison. As the mold sections close, they sever and enclose a segment of the parison within the mold cavity and shear a double-wall section of the parison into the narrow section to form a reinforcing flange on the product. Upon closing of the mold, a predetermined pressure is provided to an interior of the parison to expand the parison against internal surfaces of the mold cavity to form the remainder of the product. A mold for use in blow molding a hollow plastic product and a one-piece hollow plastic product made by the blow molding process are also disclosed.

Abstract: This invention is an improved thermoforming process and apparatus for the production of rigid plastic containers. The apparatus employs a molten sheet of thermoplastic material that is processed through two extrusion rolls, thermoformed on the periphery of a rotating form tool, mechanically ejected from the form tool, conveyed to a conventional punch press where the formed articles are trimmed from the sheet then packaged for shipment. The operation of the extruder, extrusion rolls, forming wheel, mechanical ejection and trim stations are operated as a continuous, integrated system.

Abstract: A multilayer container including an outer relatively rigid plastic layer having a body portion, a finish defining an opening and a base having an atmospheric vent opening therethrough. The container includes an inner flexible plastic layer of relative thin flexible material throughout which does not adhere to the outer plastic layer. The inner flexible layer has a closed bottom portion engaging the inner surface of the finish of the outer plastic layer and a radially extending flange portion of the inner layer overlying the finish of the outer layer. The outer layer preferably comprises an olefin and the inner layer preferably comprises amorphous nylon.

Abstract: A method of molding a heat-resistant container comprising a primary blow molding step, a primary heat treatment step, a secondary heat treatment step, and a secondary blow molding step. In the primary blow molding step a synthetic resin preform is blow-molded into a primary blow-molded article. In the primary heat treatment step, the primary blow-molded article is held in a heat treatment mold and subjected to heat treatment. The primary blow-molded article, removed from the mold, shrinks, and forms an intermediate molded article. In the secondary heat treatment step, the intermediate molded article is subjected to heat treatment outside the mold. At this time, almost no shrinkage occurs. In the secondary blow molding step, the intermediate molded article is blow molded within a final blow mold to form a final molded product.

Abstract: The present invention includes processes and resulting structures for producing moisture absorbing desiccant entrained polymers. A polymer is caused to assume a molten state, typically by applying heat and melting the polymer. A channeling agent is blended then reacted into the polymer so that it is distributed within the polymer. A desiccating agent is then blended into the product so that the desiccating agent is distributed within the product. The product is solidified so that the channeling agent forms passages in the product through which moisture is communicable to desiccating agent that is entrained within the product. The solidified product may be used to form plug type inserts and liners for closed containers, or it may be formed into any shaped article.

Abstract: The invention comprises a plasticating machine for the working and forcing of plastic material into a mold, the machine including an elongated barrel housing having a first or proximal end and a second or distal end, and an elongated screw shaft with a screw flight therearound, the screw shaft being rotatably supported in the elongated barrel housing, for the working of plastic between the screw shaft and the elongated housing. At least one delivery conduit is generally longitudinally arranged within the wall of the housing. The delivery conduit with the housing wall may be arranged to heat or cool the screw and any plastic being worked therethrough. In a further embodiment, it may permit delivery of a medium within the wall, from an upstream location of the housing, into the primary flow path of any plastic being driven from the machine and into a mold.

Abstract: A method for forming an inner thread of a preform is provided, in which an injection core can be removed after molding the inner thread on an inner surface of a neck portion with the base portion of the injection core by enlarging the diameter of the neck portion by blowing air. An inner wall 42b with a transferred inner thread is molded by using a barrel spacer 16 inserted removably into a neck mold 6 from an injection mold 1 side and a base portion 10a of the injection core 10 that has a thread pattern 12 on the outer surface and is inserted into the injection mold 1 through the neck mold 6. While the temperature of the inner wall 42b is high enough for deforming, the spacer 16 is removed to form an expansion space in the neck mold.

Abstract: A double-walled container is formed by gas assist injection molding. Thereafter, the container is further processed by 1) inserting a gas between the container layers, 2) injecting a colored liquid between the container layers, 3) evacuating the void space between the container layers, or 4) pressurizing the space between the container layers.

Abstract: Molding of relatively large articles such as automobile body parts by gas-assisted injection molding with sequential gating of injected thermoplastic resin into the mold cavity. Elongated ribs in the parts form gas channels and strengthening ribs for the parts. Structural parts are made by adhesively joining two such parts made by gas-assisted injection molding through a combination of hollow ribs and joining flanges at sides of the parts.

Abstract: A method and an apparatus are provided for blow-molding hollow articles. The blow-molding apparatus includes a carrousel mounted to rotate within a support frame. The carrousel carries four molds around a circular mold path. Two blow-molding work stations are disposed next to the mold path in fixed positions relative to the frame. The carrousel is indexed to cause each mold to pause by each work station one time during each carrousel revolution. The molds pause by each work station to allow blow-molding operations to be performed in conjunction with each mold at each work station. At one blow-molding work station, located at the 12:00 position of the mold path, an extruder injects parison into each mold. At the other work station, located in the 9:00 position of the mold path, a take-out mechanism extracts blow molded articles from the molds and places them upright on a conveyor.