Abstract: The invention provides that a tubular lining, suitable comprising an inner felt layer soaked in curable synthetic resin, and an outer impermeable layer, so everted into a pipeline or passageway by means of a gaseous fluid medium which holds the lining against the passageway surface, a pull tape or card which is inside the lining and emerges from the everting face so that tension can be applied thereto, and a lubricating medium inside the everted portion to enable the inwardly travelling uneverted portion to slide over the previously everted portion.

Abstract: A tubular lining material for pipe lines having bends or curved portions, which comprises a tubular textile jacket made of warps and wefts woven in a tubular form overlaid with a coating of a flexible synthetic resin and is applicable onto the inner surface of a pipe line having bends or curved portions in such manner that the tubular lining material with a binder onto the inner surface thereto is inserted into the pipe line and allowed to advance within the pipe line with or without the aid of a leading rope-like elongated element while turning the tubular lining material inside out under fluid pressure thereby applying the tubular lining material onto the inner surface of the pipe line with the binder being interposed between the pipe line and the tubular lining material, characterized in that a part or all of the warps are comprised of an elastic yarn around which, over the full length thereof, a synthetic fiber yarn or yarns have been left-and/or right-handedly coiled.

Abstract: A process of making a container of the dishtype, including, on the one hand, a bottom 40, walls 31 to 34 and 41 to 44 and edges 30a to 30d of exterior cardboard and, on the other hand, of a thermo-formed layer 2 of synthetic material. The edges 30a to 30d are constituted by the sides of a frame 30 and are in one piece. The frame 30 is integral with the walls 31 to 34, bent downward. The bottom 40 is integral with the walls 41 to 44, bent upward and complimentary to the walls 31 to 34. All walls are placed so as to be on the same level and are maintained by the layer 2.

Abstract: The invention concerns a method of forming a printing sleeve, comprising the steps of starting from a cylindrical supporting surface 4 upon which a knitted fabric 2" is applied as a gas-permeable means, providing a sheet of a thermoplastic elastomeric composition thereupon, and applying a pressure difference and heat so as to press the sheet upon said surface and to obtain a fusion of the sheet with the fabric.

Abstract: Non-asbestos elastomeric insulation materials for rocket motors are disclosed. The insulation materials comprise 100 parts by weight of a crosslinked elastomer polymer and between about 10 and 100 (preferably 15-75) parts by weight of an organic fiber selected from cotton flock, Sisal and a combination of cotton flock and Sisal. The insulation materials have notable erosion resistance and can be tailored to have thermal, mechanical and other properties of desired character. The organic fiber advantageously functions as a char forming, low density filler. Other ingredients such as silica, phenolic resin, polybutadiene etc. are included to enhance the utility of the insulation materials.

Abstract: A method for lining a high pressure pipeline with a tubular plastic liner. After depressurizing, purging and cleaning the pipeline is broken into discrete sections each of which is to receive a liner segment. The sections are reamed to remove obstructions which might damage the liner and a close-fitting liner segment is drawn into each section. Each liner segment is fixed at opposed ends of respective pipeline sections to prevent longitudinal movement of the segments. Bleeder holes are provided through the pipeline walls at opposed ends of each pipeline section. After the pipeline sections are reconnected to reform the pipeline, a relatively warm, pressurized fluid is pumped through the pipeline to radially expand each liner segment against the inner walls of the pipeline, thus evacuating the spaces between liner segments and pipeline sections by forcing air, water and other impurities through the bleeder holes.

Abstract: Process of making a reinforced tube including extruding a thin walled tube, encircling the tube with a completely closed layer of helically extending strip coated with heat activatable adhesive material. The tube is then passed through a sizing die heated at its entrance to activate the adhesive while subjecting the tube to relatively low internal pressure to bond the tube to the layer of strips. The integrally connected tube and strips are then passed through pinch rolls which close the tube and maintain the pressure upstream from the rolls different from the downstream pressure. Further reinforcing strips and an outer sheath are thereafter provided.

Abstract: The method discloses the lining of a lateral connection to a pipeline. The method is by remotely inserting a unit in the pipeline and everting a flexible lining tube out of an outlet in the unit directly into the lateral connection. The lining may be a flexible lining which subsequently hardens to form a rigid pipe inside the connection. The eversion of the lining tube is by means of a fluid pressure differential.

Abstract: A method and apparatus for providing the inner surface of a pipe line with a tubular lining material through a binder under fluid pressure which comprises introducing the lining material in flattened state containing a binder in the interior space thereof into a pressure container, annularly fixing the front end of the tubular lining material to the container and applying fluid pressure to the pressure container to push the lining material forward within the pipe line while effecting evagination of the lining material and at the same time bonding the evaginated lining material onto the inner surface of the pipe line, characterized in that the introduction of the lining material into the pressure container is performed by squeezing the flattened tubular lining material at definite intervals linearly in the transverse direction to the advancing tubular lining material under atmospheric pressure to isolate the portion of the lining material together with the binder contained therein between the adjacent two line

Abstract: A carbon-organic resin composite which has been initially shaped as by molding and in which the resin binder has been at least partially precured is transformed into an all-carbon composite and substantially densified by a continuous process in which the composite is continuously heated at different temperatures and subjected to increased pressure. Initially, the composite is heated at a first rate to a temperature on the order of 1000.degree. F., the first rate and the increased pressure applied to the composite being selected to substantially decompose the resin rapidly but without delamination or other damage to the composite. Heating is then continued at a second rate until the composite undergoes substantial softening and becomes plastic, typically at a temperature in excess of 3500.degree. F. Thereafter the composite is maintained at a high temperature, typically in excess of 5000.degree. F.

Abstract: A container for storing product and a process and apparatus for making the container. The container comrises a paperboard outer container and a plastic inner container which has been drawn and blow formed into the outer container. The container is characterized by plastic screw threads which extend from the plastic inner container around the upper portion of the outside of the paperboard outer container. The screw threads permit a cap to be screwed onto the container after product, e.g. food, is placed in the container. The screw threads are vacuum formed, preferably simultaneously with the blow forming of the plastic inner container.

Abstract: An elastomeric bore seal, and a method of making and installing it. The seal is a fluid-impervious, thin-walled (0.025 inch), open-ended, cylinder-like member which is made of an expansible material that can withstand a wide range of temperatures (-65.degree. F. to +400.degree. F.) and that is to be bonded and thereby installed. The use of the seal is as a bore seal in an electrical machine not only provides an economical, reliable, leak-proof way of excluding stator cooling fluid from the rotor cavity, but also permits a significant reduction (26%) in the weight of the electrical machine and a correspondingly substantial reduction in the size of the machine itself.

Abstract: A method and apparatus for repairing or relining an underground pipeline without having to excavate the pipe is enabled by attaching an expandable sealing unit to the end of a predetermined length of flexible tubing and feeding it through the pipeline. The flexible tubing is fed through the existing pipeline from a point beyond where the existing pipeline exits the earth, usually within the basement of a building. Once positioned in the desired location, the expandable sealing unit is expanded to form a tight seal at the desired location within the pipe by means of heating the expandable sealing unit by a heating unit connected to the source of energy through electrical conductors which pass through the flexible tubing.

Abstract: In providing an electrically insulative covering for a cable splice, a sleeve is assembled with an outer rigid shell and is maintained in fluid-sealed relation therewith. A supply of positively pressurized air is placed with the assembled sleeve and outer member, in fluid-sealed relation with the sleeve interior. The sleeve is expanded into contiguous relation with the outer member by the pressurized air. The expanded assembly is placed over the splice and the fluid-sealed relation of sleeve and outer member is interrupted, causing the sleeve to collapse upon the splice and cables, whereupon the outer member is removed and discarded.

Abstract: A hole, particularly an accidental perforation, is closed by manoeuvering a bladder (g) into the hole employing a hollow rod (f) on which the bladder is mounted at one end. An operator operating from the other end of the rod actuates a device such as a triggered valve to cause the components of a settable foamed plastics material to pass (via tubes b and rod f) from their sources (in a) to fill the bladder (g) so that it closes the hole. The settable foamed plastics material is preferably polyurethane foam. The bladder may be of natural or synthetic rubber and may be protected against tearing by a textile envelope. The sources of foamed plastics material may be either in a portable kit (a) or rupturable containers within the bladder (g) or rod (f).

Abstract: A composite sports racket frame having a head portion subject to loading is provided with an integral arrangement of resin impregnated braided tow tubes and a layer of tow disposed in wound fashion between part of the braided tows. A method of making a sports racket frame by winding a resin impregnated tow about part of a braided tow tube and placing a second braided tow tube to form an assembly that is internally pressurized and heat cured is disclosed.

Abstract: A sewer pipe, transport pipeline, or other circumferentially enclosed passageway is lined by inserting into and along it a flexible tubular material of given diameter, with its corresponding circumference being less than the inside perimeter of the passageway. The tubular material is a laminate having a dimensionally stable skin layer facing the interior of the passageway and a contiguous layer of a composition foamable to form an expanded cellular structure. After insertion of the tubular material the contiguous layer is foamed to expand cellularly so as to fill the space between the inner skin and the inside wall of the passageway and to solidify in place. The tubular material may have an expansible outer skin layer also.

Abstract: The invention provides that a flexible liner is everted into a passageway to line same using liquid under pressure. The liner is fed through an enclosure before it everts and eversion is achieved by pressurization of the liquid in the enclosure. The feed of the liner through the enclosure is preferably controlled by the drivable feed rollers through a nip of which the liner passes. The rollers preferably have projections which engage the liner positively to engage the liner. The invention has particular applicability to the placement of liners which although flexible and evertible when being installed, set hard when in position lining the passageway.

Abstract: Disclosed is a container for storing product and a process and apparatus for making the container. The container comprises a paperboard outer container and a plastic inner container which has been drawn and blow formed into the outer container. The container is characterized by plastic screw threads which extend from the plastic inner container around the upper portion of the outside of the paperboard outer container. The screw threads permit a cap to be screwed onto the container after product, e.g. food, is placed in the container. The screw threads are vacuum formed, preferably simultaneously with the blow forming of the plastic inner container.

Abstract: This invention relates to a method and apparatus for fabricating a composite structure and, in particular, to a method and apparatus for fabricating a hollow composite structure having a dense laminated wall formed by bonding and curing a plurality of resin-preimpregnated fiber sheets or tapes under heat and pressure.Hollow composite structures may be formed by applying layers of resin-impregnated fabric material onto a pressure bag covering a rigid mandrel, disposing the assembly of the mandrel, pressure bag, and uncured composite layers within an outer mold, transmitting heat to the composite material to cure the resin and applying pressure within the flexible pressure bag to act against the composite material during the curing operation to assure proper dimensions, density, structural properties and wall thickness of the cured composite structure.

Abstract: An overhead electric conductor with optical fibres loosely housed in the bore of a central core, which bore also contains a greasy water-impermeable medium 4, is manufactured by causing a preformed elongate metal member of U-shaped transverse cross-section and the optical fibres to advance in the direction of their lengths, the rate of advance of the fibres being restrained. As the U-shaped elongate member is transversely folded around the optical fibres greasy water-impermeable medium is injected into the bore of the elongate metal member under a controlled pressure. The consistency of the greasy water-impermeable medium the pressure and rate at which it is injected into the bore and the degree of restraint imparted to the optical fibres 3 is such that, in a predetermined length of the conductor, the length of the optical fibres exceeds the length of the bore by a controlled extent, preferably 1 to 3%.

Abstract: A method and apparatus for providing the inner surface of a pipe with a flexible tubular lining material through a liquid resin under pressure which comprises fixing one end of a flexible tubular lining material in such manner that the flexible tubular lining material is turned inside out at the fixed end to an annular fastener of a connecting assembly connected in the front thereof to a pipe to be treated and thereafter applying fluid pressure to the annular fastener from the rear of the assembly to push the tubular lining material forward within the pipe while effecting evagination of the tubular lining material at the same time at the top of the proceeding tubular lining material thereby attaching the inner surface of the tubular lining material exposed by evagination under pressure tightly to the inner surface of the pipe, characterized by previously forming a reservoir of the liquid resin enclosed in the interior of the unevaginated portion of the tubular lining material positioned in the rear of the ann

Abstract: A method of impregnating the inner absorbent layer of a long flexible tube with a curable resin is begun by introducing a mass of the resin into one end of the tube. A window is formed in the impermeable outer layer of the tube at a distance from the resin mass. A vacuum in the interior of the tube is drawn through the window and concurrently the resin mass is pushed toward the evacuated region by passing the tube between a pair of squeezing members. When the flowing resin reaches the vicinity of the window, the window is sealed. Another window is formed in the tube farther downstream of the previously formed window. A vacuum is drawn through the new window while the squeezing members force the resin to flow toward the newly evacuated region. The procedure is repeated until the resin has spread through the entire inner absorbent layer of the tube.

Abstract: Process for internally lining a conduit by bonding with a resin to the inner wall of the conduit, of a fluidtight inner lining sleeve under the urging of at least one pressurized fluid acting on the inner wall of the sleeve through an inflatable envelope. The temperature in the envelope required for polymerization of the resin, and the pressure inside the inflated envelope may be controlled.

Abstract: A method and apparatus for causing a flexible tubular lining material to be fixed to the inner surface of a pipe line wherein the tubular lining material is initially attached to the inner surface of the pipe line by a binder provided on the surface of the tubular lining material which comprises providing a flexible hose material having a porous structure inside the pipe line which has been lined with the tubular lining material and introducing a heated gaseous fluid stream into the interior of the flexible hose whereby the heated gaseous fluid stream is introduced through the pores of the flexible hose along the inner surface of the lined pipe line, the flexible tubular lining material being warmed to accelerate the curing of the binder interposed between the inner surface of the pipe line and the flexible lining material.

Abstract: A method for smoothly evaginating a tubular material under pressure, if necessary, within a pipe line with simultaneous bonding the evaginated tubular material onto the inner surface of the pipe line, which comprises placing in a pressure container having a discharge pipe a part or whole of a tubular material, if necessary, with one terminal end thereof being connected to a first like material rope having a length at least equal to that of the tubular material, if necessary forming a reservoir of a binder enclosed in the interior of the tubular material placed in the pressure container to apply the binder onto the inner surface of the tubular material, fixing the other open terminal end in evaginated state to an annular fastener of said discharge pipe, and applying a pressurized fluid to the pressure container to evaginate the tubular material over its full length as it is propelled from the discharge pipe and, if necessary, moved forward within the pipe line and at the same time bonding the evaginated tubula

Abstract: A double-walled paper container produced by placing a preformed paper container in a shaping die set cavity of a vacuum draw shaping apparatus, positioning a single piece of synthetic resin film or sheet on the top of said paper container, holding the film at the peripheral edge thereof, heating the film to make the plastic film, stretching the film and applying negative pressure to the film to line said preformed paper container with the film is in water-tight fashion and wherein the lined paper container has a good shape holding ability and is hygienic for the user thereof.

Abstract: Method of forming an interlocked assembly of a base cup and a hollow plastic article including the steps of providing a groove in the side wall of either the article or cup engageable with a protrusion in the side wall of the other of said article or cup, internally pressurizing the article to harden same and outwardly expand the side walls, and forming an interlocked assembly by placing the base cup on the article to deform the side walls of the base cup by the hardened article and snap the groove and protrusion together.

Abstract: Tubing of a thermoplastic polymer for handling corrosive materials is laminated or reinforced by covering the same with a heat-softenable bonding agent as an adhesive, inserting the adhesive-covered tube in a cylindrical glass fabric sleeve, inserting the assembly in a hollow cylinder, heating the tube to a temperature to cause the softening of the bonding agent and adhesion to the tube, forcing the tube with air or centrifugal force against the inside of the cylinder to force softened bonding agent into the interstices of the glass fabric, and cooling the entire assembly while expanded to adhere the bonding agent to the fabric and thereby form a unitary structure. The reinforced tube can be bonded to the inside of a preformed steel or fiberglass-reinforced plastic pipe to serve as a protective liner therefor.

Abstract: Disclosed is a method of lining a pipeline with a flexible tube by progressively inflating the interior of a flattened tube placed within the pipeline while simultaneously evacuating the space between the flattened tube and the pipeline interior wall.

Abstract: A barrier aerosol package wherein a product bag is positioned in a container and has the upper portion gathered and sealed to the container curl defining a valve cup receiving opening. A tool is provided for receiving the upper part of the product bag and supporting the bag for the application of a band of adhesive, after which the tool is utilized to collapse the bag while uniformly folding or gathering that part of the bag to which the adhesive has been applied. The tool then applies the collapsed bag to the container and trims the excess bag material, after which the bag is inflated to restore its initial configuration followed by the removal of the tool.

Abstract: A method and apparatus for lining a pipe, e.g. an aluminium pipe, with a thermoplastic material, in which either the inner surface of the pipe or the external surface of a tube of thermoplastic material is coated with an adhesive layer, the tube is inserted in the pipe, a purely radial force is applied to press the plastic tube against the inner surface of the pipe, and axially progressive heating is applied to render the thermoplastic material into a plastic state.

Abstract: Individual flanged trays are deposited on a conveyor belt. A continuous film is applied across the top surface of the trays. A heated flat plate is pressed into the film and causes the tray flanges to bend to a desired position. The plate heats the film throughout and bonds the film to the tray flanges. Directly thereafter and while at the same station, vacuum is applied which serves to deform the film into the interior of the trays. The formed film preferably has rounded corners and may be partially separated from the bottom wall and side walls of the tray by an air space. Thereafter, a heated plug preferably having insulated sides, heat seals the now deformed film to the bottom wall of the tray. A cutting device trims the excess film at the tray flanges. The excess film may be scavenged and recycled. The cutting device may be provided at the deforming station or the sealing station or at a trimming station downstream of either of these stations.

Abstract: Processes are disclosed for forming containers having the complete outer surfaces decorated and the bottom surface reinforced as well. In one embodiment a banderole is placed in a deep-drawing mold and length of drawable foil having a bottom blank secured thereto is fed to the mold. In a second embodiment the bottom blank is placed in the mold, together with the banderole prior to the feeding of the drawable foil. Pleating of the peripheral edge of the bottom blank prevents covering of the suction openings in the deep-drawing mold.

Abstract: A method of fabricating double-curvature shells from meridional petaloid sections consisting in that the prefabricated meridional petaloid sections are joined consecutively with one another in a number required for making a shell. The meridional petaloid sections are made from a flexible material and in the process of their joining they are successively coiled into a spindle-shaped roll for storage and transportation and the double-curvature shell is made by applying an axial force to at least one of the roll ends for uncoiling the roll and simultaneously imparting a longitudinal curvature to said sections after which the first and the last sections are joined with each other. The method according to the invention permits fabrication of high-quality double-curvature shells of any volume from any flexible material, it is highly efficient, calls for low expenditures of labor and funds, is simple and convenient in practice.

Abstract: An insulation system for use in rocket motors containing solid composite propellants is disclosed. Some composite rocket propellants are based on carboxyl-terminated polybutadiene (CTPB) and others on hydroxyl-terminated polybutadiene (HTPB) binders. An important requirement of such systems is the ability of the wall insulation to adhere to the combustion chamber and of the composite propellant to adequately adhere to the insulation system. With CTPB propellants, a sheet insulant comprising chrysotile asbestos fibers and floats dispersed in a CTPB polymeric binder has been successfully employed. However, the use of a similar sheet insulant based on HTPB polymeric binder has not proved to be compatible with HTPB propellants.

Abstract: A lining comprising a resin absorbent tube having on the outside a fluid impermeable membrane everted into the passageway to line same using fluid pressure. The resin absorbent material is soaked in resin by trapping a quantity of resin in the lining before it everts in the passageway, and the resin is cured after the lining is everted into the passageway surface, preferably by a curing means following the everting lining along the inside of the passageway.

Abstract: This relates to a lined container, preferably of the fibre drum type, wherein the lining is extruded as an open ended tube and is initially adhered to the bottom or end wall of the container to seal the tube after which the tube is first inflated and blown across the end wall and is then blown within the container so as to conform to the interior configuration of the container body. The tube is formed by an extruder, and/or accumulator capable of intermittent extrusion with there being relative movement between a die associated with the extruder and the container during the extrusion of the tube, and after the entire interior of the container has been lined, there is associated with the die and the container a mold which upon further extrusion of the tube and the blowing of air within the tube the tube either may be caused to fold around the exterior free end portion of the container so as to form therearound or may be shaped to define a flange which is later draped around the container free end portion.

Abstract: Apparatus for lining by lamination air-permeable containers with thermoplastic film involving a deep drawing operation. The containers are held in deep drawing molds formed in a rotating table and the film blanks are formed from a film web onto individual holding means secured to another rotating table, the driving means for the tables being synchronized such that the film blanks are timely presented for the deep drawing operation following heating. Each holding means includes a metallic frame having a plurality of closely spaced pins for penetrating a film blank around the area to be deep drawn, the pins causing the area to be relieved of stresses during heating and shrinkage and hence troublesome wrinkles in the blanks prior to being deep drawn. Surprisingly, the pins do not cause tearing of even very thin film, because of the head conductor property of the pins and its effect on the arcing of the film blank in the vicinity of the pins as the blank shrinks.

Abstract: To produce a laminated container consisting mainly of thermoplastic materials, an outer container element consisting of material having desired barrier properties is first vacuum moulded from thin foil or film material in a vacuum mould, and thereafter an inner container element is blow moulded in the same mould with the outer container element present therein. To carry out this method, a mould is provided which consists mainly of two vacuum mould halves which are closable upon an intermediary plate in the vacuum moulding step and directly closable upon one another in the blow moulding step.

Abstract: A process for lining an air-permeable container, such as a paper cup, with a thermoplastic foil by directing a warm pressurized stream of gas to press the foil into place and varying either the flow rate or temperature of the gas stream or both to guarantee the foil shape within the container while it is thus controllably cooled and solidified. The apparatus includes a controllable discharge valve, such as a relief valve formed at the edge of a spring loaded cover through which gas is supplied, for allowing a faster gas flow for cooling than used for deep drawing the foil. Either one or two gas supplies may be used. In the case of two, the gas supply for cooling is at a higher pressure than that used for deep drawing and is preferably at a lower temperature.

Abstract: A method wherein a tubular liner is applied to the surface of a passageway such as a tunnel or pipeline bore. The liner may be in the form of a flattened tube of absorbent material such as felt or foam such is impregnated with synthetic resin. The liner is anchored at one end of the passageway and is fed into the passageway being turned inside out as it is so fed in. In order to eliminate friction, the liner, before being turned inside out, is supported buoyantly by liquid which serves to carry the liner.

Abstract: In an injection blow molding process for making plastic receptacles, an injection station is provided for injection molding a parison of selected configuration. An expansion and blowing station follows for initially expanding the parison to a predetermined length, and thereafter the parison is blow molded into a predetermined lateral and final configuration to thereby biaxially orient the molecular structure of the parison. An ejection station is provided for removing the finished product from the apparatus. The parison is transferred along a first path away from the injection station, along a second path which is normal to the first path and then along a third path parallel to the first path to the expansion and blowing station. At the same time, a finished product is transferred from the blowing station to the ejection station along a corresponding path.

Abstract: In a continuous method of making pipe from fiber elements coated with a thermosetting resin, the coated fiber elements are wrapped around a resin saturated conveyor tube which becomes an integral part of the finished pipe assembly. The method of manufacture employs a first mandrel section and a second mandrel section in alignment therewith and longitudinally spaced therefrom by a gap. A tube of resin-absorbent material is applied to the first mandrel section, a thermosetting resin is applied to the tube as it passes over the gap in an amount sufficient to saturate the tube. The resin is at least partially cured prior to its arrival onto the second mandrel section where it provides the conveyor tube for the application thereto of a plurality of bands of continuous fiber elements coated with a thermosetting resin composition.

Abstract: Two or more lengths of seamless tubing, for example artificial sausage casing are assembled by longitudinally aligning the end portions thereof overlapping and joined to each other by an adhesive strip band but for the time without internal communication therebetween. Internal communication between the lengths of tubing is established, for example, by introducing compressed gas into one tubing length remote from junction zone which causes this tubing length to take a cylindrical configuration moving its side walls (defined by its initially flattened shape) apart and thereby the side walls of the second joined tubing length are drawn with the corresponding side walls of the first tubing length by means of the adhesive strip band. As a result thereof the end portions of the side walls initially in contact with each other slide along each other and then out of contact in order to provide continuous internal communication in the tubular assembly.

Abstract: The invention concerns a process for the manufacture of textile or wire-reinforced hoses, the components of which are placed while the inner tube is supported by a mandrel.According to this invention, the mandrel is made of a congealable fluid which is introduced inside the tube and then cooled and solidified during manufacturing steps wherein the formed assembly will resist mechanical stresses which would not be endured by the sole constituents of the hose. The mandrel is thereafter brought back to a liquid form to be drained off.The invention is applicable to the manufacture of medium and high pressure hoses.

Abstract: A method for producing a container of large capacity formed of an outer shell of structurally strong material and an inner plastic container joined at its upper end portion about the rim of the shell and resting at its bottom end on the bottom wall of the shell with an air cushion between the outer side walls of the plastic container and the inner walls of the shell. A sheet of the plastic is vacuum formed within the outer shell and then allowed to shrink in order to form the air cushion.

Abstract: A method for repairing ruptured or otherwise damaged or weakened large diameter pipes such as underground water or sewer pipes, includes opening the opposite ends of the pipe to provide access, cleaning debris from within the pipe and smoothing its inside surface. A peripherally expandable fibrous web reinforced synthetic organic resinous tube which is either thermoplastic or thermosetting and in an uncured state is inserted in the pipe and clamp to the ends thereof by end plates and expanded into tight engagement with the pipe wall by circulating hot pressurized air through the tube. The interface of the pipe and tube may be provided with a heat sensitive adhesive and where the tube resin is thermosetting, the hot air is maintained until curing or setting is effected. Thereafter the repaired pipe is flange reconnected to the opposite end pipes.

Abstract: A batch process for vulcanizing, without the use of a lead press, reinforced elastomeric hose built up on a solid mandrel, preferably a flexible mandrel of rubber or thermoplastic material, is disclosed. In the preferred embodiment of the process, the uncured hose is first annularly tightly clamped at its opposite ends and is then immersed in a bath of liquid, e.g. water, sufficient to cover the hose substantially completely. The entire assembly is then subjected in a pressurized heating environment, e.g. in a steam-filled vulcanizer or autoclave, to the action of fluid pressure against the outer hose surface and the pressure due to the thermal expansion of the mandrel against the inner hose surface. The clamping of the hose ends prevents entry of fluid pressure into the space between any two proximate layers of elastomeric material occupied by a layer of the filamentary reinforcement.

Abstract: A method and apparatus is provided for continuously making fiber reinforced plastic pipe in which a conveyor tube is formed on an axially fixed hollow rotatable mandrel. A plurality of bands of resin impregnated fiber elements are wound on the conveyor tube as it advances to provide the pipe assembly. The terminal end of the generated pipe assembly is sealed with a plug. A fluid under pressure is fed through the hollow mandrel and out the forward end of the mandrel into a chamber formed by the generated pipe assembly, the plug, and a fluid sealing means within the pipe assembly being generated, thereby causing the pipe assembly to advance.