Abstract: The invention relates to a device for the overlapping welding of foil edges. The device has heating surfaces for heating the foil edges. In order to achieve uniform heating of the foil edges, longitudinal ribs are provided over the entire width of the heating surface. Hereby it was found to be advantageous if the heating surfaces are constructed rib-free, i.e. smooth, in the starting area provided for the leading in of the foil edges. In this starting area, the foil edges are plastified at the leading-in surfaces first to such an extent that the longitudinal ribs are able to burrow themselves into these surfaces from the start.

Abstract: A method of bonding a contoured seat cover with a first surface to a seat cushion with a second surface is provided which includes the steps of coating the second surface with a heat-activated adhesive, placing a flexible planar heating member between the first and second surfaces, pressing the first and second surfaces together against the heater with a force of one to five pounds per square inch, heating the adhesive with the heating member, removing the heating member while the first and second surfaces are pressed together, and allowing the adhesive to solidify and then relieving the pressure between the seat cover and the seat cushion.

Abstract: The present invention relates to a pre-proof temperature controlling assembly associated with an off-press apparatus for laminating an image sheet to an image receiving substrate and, more particularly, for laminating a plurality of image sheets to the receiving substrate and then laminating a portion of the receiving substrate to a display sheet.

Abstract: The mold is secured on the bed portion, and the frame is moved up and down by the jack devices so that the rubber sheet is moved down to the mold and moved up from the mold in a reciprocating motion. While setting the work W, the rubber sheet is stretched by the sheet stretching devices for absorbing the deflection of the rubber sheet, thereby the possibility of the dislocation of the work W on the mold due to the contact with the rubber sheet is reduced, and the insertion of the work between the rubber sheet and the mold becomes easy. Both edge portions of the rubber sheet extending beyond the edge of the mold are clipped by the convex portion formed on the bed portion and the concave portion formed on the frame, thereby the wrinkling of the rubber sheet hardly occurs.

Abstract: A plastic pipe butt fusion machine has a base, a clamp on the base for securing a first length of plastic pipe, a second clamp mounted on the base for securing a second length of plastic pipe to be fusion welded to the first in axial end-to-end alignment, the second clamp being moveable relative to the base, a spring positioned between the second clamp and the base so that when the spring is tension loaded the second clamp is urged in the direction toward the first clamp to thereby resiliently urge the plastic pipes held by the first and second clamps into axial abutted relationship during fusion.

Abstract: An automatic waterproofing apparatus for automatically waterproofing a joint of electric wires, comprising: a plurality of pallet jigs each of which is formed with a recess for receiving the joint, a pair of slots for receiving the electric wires and an air vent hole communicating with the recess; a transport device for continuously transporting the pallet jigs; a sheet feeding device for feeding onto an upper face of each pallet jig a flexible band-like sheet; a slit forming device for forming at opposite sides of the sheet a pair of slits corresponding to the slots, respectively; a suction device for sucking air in the recess of each Dallet jig from the air vent hole so as to bring the sheet into close contact with the recess; a joint placing device for placing the joint in the recess and inserting into the slots through the slits the electric wires disposed at opposite sides of the joint; a filler injecting device for injecting a predetermined quantity of filler into the recess; and an adhesive tape bondin

Abstract: A method and apparatus for fusing a bell connector to the end of a corrugated thermoplastic pipe are disclosed in which an expandable mandrel grips a preformed bell and a pipe support grips a pipe co-axial with the longitudinal axis of the bell. A pipe trimmer for facing the pipe end may be moved into and out of the axis of the pipe if necessary for trimming the pipe end to provide a uniform planar face and a heater moved sequentially into and out of the axis of the pipe and bell for heating the opposed faces of the trimmed end of the pipe and the end of the bell to a desired fusing temperature. Upon heating of the opposed faces of the bell and the pipe to a predetermined fusing temperature, the said faces of the bell and the pipe are abutted against each other at a predetermined pressure for a time sufficient to fuse the bell and pipe together.

Abstract: Method and apparatus for heating and applying sheet material to an supported base surface are disclosed. The apparatus includes a mobile frame for transporting, supporting and permitting a roll of sheet material to be unrolled. The apparatus further includes a heating platen for heating the sheet material along its width and for heating the supported base surface. Pressure rollers are also disclosed for pressing the sheet material against the heating platen to facilitate heating thereof and to the base surface to facilitate welding. In addition, the apparatus includes a release mechanism for pivoting the heating platen and the pressure means in unison to and from operating and release positions. In the release position, the sheet material is separated or spaced from the heating platen to prevent it from being overheated thereby and possibly ignited.

Abstract: The invention relates to an air-exhausting and pre-pressing apparatus for laminated glass sheets. In the manufacture of laminated windscreens, the glass sheets are carried on a conveyor in a substantially upright position through a heating tunnel. The suction tubes included in a suction track adjacent to the conveyor are coupled with suction rings surrounding the edges of the laminated glass sheets. A preheating station, a heating station, and a recooling station are set successively to define together a heating tunnel, the conveyor extending through the heating tunnel. The preheating station and the recooling station are linked with each other by at least two air circulation ducts for circulating air from the recooling station to the preheating station and from the preheating station back to the recooling station. The arrangement saves heating energy and achieves a uniform heating and cooling of glass sheets.

Abstract: A machine for processing raw material plates includes a feeding assembly, a first transportation assembly for moving raw material plates to a front clamping assembly which is used to clamp a first raw material plate for subsequent cutting of an irregular front end of the first raw material plate by a front electric heating assembly. The machine further includes a movable table device for moving the first raw material plate to a rear clamping assembly for subsequent cutting of an irregular rear end of the first raw material plate by a rear electric heating assembly. The rear electric heating assembly has a further function for fusing the cut front end of the first raw material plate to a previously fused material web before the cutting of the rear end of the fused material web. A second transportation assembly is provided to feed the first raw material plate to the rear electric heating assembly.

Abstract: Rolls of toilet paper are produced by winding a paper web around each of a plurality of air permeable cylindrical cores each having a fixed, outer diameter while applying a liquid to only a leading portion of each web so that wound webs each having a wet inner portion are formed. After drying the wound webs to integrally bind the inner portion, the core is separated from each of the wound webs.

Abstract: A method and apparatus for laminating two pieces of material involves edge bonding. The method includes the steps of: placing pieces of a first material into a fixture on a work platform, depositing a powder adhesive onto an edge zone of each first material piece, curing the adhesive to a form ready for bonding, placing pieces of a second material into the fixture such that each sits above a piece of the first material, applying heat and pressure to the fixture to press each piece of first material against each piece of second material, and removing the finished pieces from the fixture. The method utilizes a rotatable table carrying six equiangularly-positioned fixtures, as well as six workstations positioned equiangularly around the table.

Abstract: A vacuum forming mold has a plurality of dies with at least one die being movable with respect to the other dies. The die can be movable in a linear direction or they can be movable in both a linear and angular direction. A plurality of plastic sheets are heated and placed on a respective die with a vacuum being supplied through the dies to attract the plastic sheet. Once formed, the dies are moved together to create a seam bond between adjacent pieces of plastic sheets. Additional heating can be supplied to insure an adequate seam bond if required. In another embodiment, a single sheet of material composed of a plurality of sheets of material is used. The single sheet of material has a plurality of preseamed areas connecting each of the individual plastic sheets. These preseamed areas are positioned inbetween adjacent dies of the plurality of dies and the process continues as described above for the multiple sheets of material.

Abstract: The process for the production of a thermoelectrically weldable zone in thermoplastic materials is significantly improved by the true-to-size, air-free embedding of the heating conductor at a clearly defined depth below the joining surface. For this purpose in a first process step a sublevel wire bed bottom is cut in the material, in which is cut a substantially inverted T-shaped incision, running in two planes and at the desired depth, measured from the material surface and, following the surface profile, the cut is passed along the heating conductor insertion line. Using the same tool the cover strips formed are raised and stretched along the path of cut, so that an open channel is formed with the sublevel wire bed bottom. Preferably in the same operation the wire bed is also cut true-to-size with a cutting tool and corresponding to the heating conductor. In a later process step the heating conductor is placed through the still open channel, the cover strips are pressed and then melted.

Abstract: Bevelled end edges (37, 38) of gasket lengths (21, 36) are fused into miter joints (39) at corners (18) by welding apparatus having jig and clamp sets (64) on plates (49, 50) that are mounted on rails (59, 60) and separated by cam followers (81, 82) which interact against the bias of a spring (87) with a cam (88) which is rotated by a handler (93) on a shaft (73) to set the spacing of the sets (64). End edges (37, 38) are aligned in the spacing gap (54) against surfaces (185, 186) of a sissy bar (180) which is lifted up when the cam (88) is turned to its position of longest spacing. The bar (180) is then lowered and a heater block (29) is moved and locked into an advanced position within the gap (54) pulling a handle (115 of a rod (116), by spring finger (122) which shifts onto a lockwheel (125). The cam (88) is turned to an intermediate spacing position to melt the edges (37, 38) against the block (79), and then moved to a shortest spacing position to fuse the melted edges together.

Abstract: A welding machine has a press-on and advancing movement device with two press-on rollers which are arranged one after the other and are driven jointly, a press-on belt being looped around the press-on rollers. The front roller, as seen in the traveling direction, is supported in such a way that it can be lifted when traveling over uneven surfaces so that straight running is maintained. To improve this further, the two traveling rollers which run in advance and are arranged so as to be laterally offset are supported at a swivel plate so that the traveling track can be adjusted. Further, the shaft of the two traveling rollers is not directly driven, but rather a slip clutch in the form of two rubber blocks is arranged between it and a separate drive shaft. The latter as well as the two press-on rollers are synchronously driven by a motor by way of a toothed belt.

Abstract: A device for bonding a thermoplastic tape to a substrate to form a fully consolidated composite. This device has an endless chain associated with a frame so as to rotate in a plane that is perpendicular to a long dimension of the tape, the chain having pivotally connected chain links with each of the links carrying a flexible foot member that extends outwardly from the chain. A selected number of the foot members contact the tape, after the heating thereof, to cause the heated tape to bond to the substrate. The foot members are each a thin band of metal oriented transversely to the chain, with a flexibility and width and length to contact the tape so as to cause the tape to conform to the substrate to achieve consolidation of the tape and the substrate. A biased leaf-type spring within the frame bears against an inner surface of the chain to provide the compliant pressure necessary to bond the tape to the substrate.

Abstract: A filter comprising a composite sheet bent like a pleat and composed of a laminate of at least two monolayer sheets, in which the bent portions are fusion-welded, is provided in order to improve filtering properties while carrying out the composing and pleating processes in one process. A device for manufacturing the filter is also provided. The device comprises, for example: a pair of star-shaped gear type ribbed rolls engaged with each other for heating the composite sheet to temperatures suitable to fusion-weld the same at the front end of the gear while bending the composite sheet like a pleat having a bent width corresponding to the depth or height of the gear; star-shaped gear type bending roll for further bending the heated composite sheet like a pleat; and a pair of heating plates positioned opposed each other at a distance corresponding to the bent width of the pleat.

Abstract: By providing a pre-formed compressible substrate with an intimately bonded thin film layer integrally affixed thereto in surrounding protecting relationship, a surface coated cushioning member for mounting to otherwise hard-surfaced products is realized. In the preferred embodiment, the surface coated cushioning member of the present invention is formed from foamed thermoplastic, elastomeric or rubber polymers or copolymers and are constructed with an elongated hollow cylindrical shape for peripherally surrounding and protecting products manufactured from elongated tubes, pipes, conduits, and the like. In addition to the product achieved, the present invention also includes a unique process for manufacturing the surface coated cushioning member and systems employed in accordance with the preferred process.

Abstract: A production line for manufacturing wooden I-beams wherein a pair of grooved flanges are conveyed along opposite sides of a train of web members and converged so that the web longitudinal edges are inserted into the chord grooves is disclosed. The flanges are each sequentially fed into left and right hand sides of the assembly line through a cam type flange feeder and a resiliently mounted hold-down member automatically orienting the flanges with the flange grooves facing inwardly. A lugged web feeder engages a longitudinal edge of each web to laterally convey same, or random web lengths, into the upstream end of the assembly machine. A web bottom drive engages the web undersides to convey same into contact with the flanges while eliminating overhead clutter to enable easy access to the web and flange members for manual intervention.

Abstract: An elastic band activation apparatus for activating a heat-sensitive thermal film attached to an edge of a body of an article to form an elastic band along the edge of the article. The apparatus has at least one chamber with a heating zone having a shrinkage atmosphere at a first temperature sufficiently elevated to activate the heat-sensitive thermal film to shrink the film to form the elastic band. The chamber may also have a cooling zone with a quench atmosphere at a second temperature which is less than the first temperature to arrest the shrinkage of the heat-sensitive thermal film. An article transporter transports the article through the heating zone and then through the cooling zone. The apparatus may also include two lateral compression bars for spreading apart first and second adjacent edges of an article when transported through the chamber to expose the article interior region to activate first and second heat-sensitive thermal films, thereby forming first and second elastic bands.

Abstract: The invention relates to a device for welding overlapping foil edges with a heater, with contact rollers for the exterior contact at the foil edges as well as at least one height adjustment device, whereby the height adjustment device has a guide device for movement control of the respective contact roller essentially transversely to the processing direction of the foil edges, as well as a drive for moving the contact roller.

Abstract: A method and apparatus for forming a plastic film-protected external siding board in a molding press having an upper normally closed heating box open at its lower end, and a support system below the upper box which supports a board core with a plastic film draped over it to project beyond its side and end edges. The upper clamp box and film are brought into engagement to close the heating chamber with the film which is then billowed upwardly in the heating chamber to prevent it from sagging while heat is applied to raise the film to molding temperature. A differential pressure is then applied to the film to mold it to the core.

Abstract: An apparatus for utilizing a wheel rim tape around a wheel rim. The apparatus has a table. A first device is used for holding the spoked wheel on the table. A strap is induced manually about the wheel rim, thereby forming a loop. A second device is used for shearing the loop from the strap, with two terminal portions of the loop overlapping with each other. The second device is used for adhering the first and second terminal portions of the loop.

Abstract: An apparatus for manufacturing a magnetic disk wherein a center core having an adhesive substance previously applied thereto is adhered to a magnetic sheet. The apparatus includes a holder having a center core retaining member extending therefrom for receiving and retaining the center core, the holder being rotatable such that the retaining member rotates about an orbital path; a core feed station, disposed along the orbital path, to which the center core having the adhesive applied thereto is fed, the center core being received by the retaining member at the core feed station; an adhering station disposed along the orbital path at a position downstream of the core feed station for adhering the center core to the sheet; and an annular housing substantially surrounding the orbital path an through which hot air is circulated so as to partially dry the adhesive applied to the center core.

Abstract: An improved device and method for welding battery jar covers onto battery jars with the battery elements and terminal posts in position in the jar wherein said improvement includes means for pressing the molten bead, created between the battery jar and the battery cover during welding, flat against the cover and the jar until said molten bead solidifies.

Abstract: Free edge-sealed film articles and a method for making such, wherein the articles comprise a plurality of film portions and contain a free edge-seal between two of such portions, with one or both of the two free edge-sealed portions consisting essentially of a plurality of layers of diverse thermoplastic materials which are so ordered that on sealing the two portions together, the ordered layered film portion is curled toward the other of the two free edge-sealed portions.

Abstract: A device for manufacturing a welded connection of tubular components of plastics material. The ends of the components to be connected are axially aligned and held to abut with the end surfaces. The ends of the tubular components can be heated by a foldable heating device which surrounds the tubular components. A support device is arranged in the interior of the tubular components. A heating device which can be fastened on a frame in a determined position is provided for each pipe diameter dimensioned to be welded. Electrical contacts are provided for each heating device. A welding program of a program control predetermined for each dimension can be selected by the contacts when the heating device is placed on the frame.

Abstract: In a method and apparatus for laminating prepreg sheets, a plurality of heaters and a plurality of fans are installed beneath an operating table and a table temperature sensor and a room temperature sensor are provided in and above the operating table respectively. The heaters, fans, table temperature sensor and the room temperature sensor are controlled by a temperature control device. A face sheet is mounted on the operating table and the prepreg sheets are laminated while maintaining the temperature of the face sheet at a higher value than the temperature of the prepreg sheets, whereby the adhesive force of the face sheet becomes higher than that of a carrier sheet so that the prepreg sheet can be accurately bonded to the face sheet.

Abstract: System and method for densifying expanded thermoplastic foam materials such as loose fill packing materials, larger blocks of such materials, and food and beverage service items to reduce the volume of such materials for recycling or disposal. The material is heated to soften the material and expel gas from cells within the material and thereby shrink the material to a reduced volume. In some embodiments, and the material is further densified by compacting the heat softened material to further reduce the volume.

Abstract: A device for selectively connecting and disconnecting plastic tubes includes a welder. A carriage is located in the welder for conveying a heated wafer through the welder. A pair of arms is mounted in the welder with each arm having a tube holding pocket which extends across its respective arm. The arms are movably mounted to generally align the pockets with a gap therebetween. Each of the arms has a clamp for selectively clamping a tube in its pocket. A wafer removal station is in the welder downstream from the arms. The carriage is driven to the wafer removal station so that the wafer first passes through the gap to contact the tubes and then the wafer passes into the removal station so that it may be removed from the carriage and the carriage may be returned to its starting location. The welder includes a computer for controlling the operation and synchronizing the timing of the carriage and the arms to automate the welder.

Abstract: An automatic package strapping machine having a sliding plate movable in a table between a forward position and a rearward position, a first clamp under the forward position of the sliding plate and movable up and down to press a leading end of a strap inserted under the sliding plate from one side of the sliding plate against the under side thereof, a second clamp under the forward position of the sliding plate and movable up and down to fix a part of the strap extending thereover and the leading end of the strap against the under side of the sliding plate, a pressing device under the forward position of the sliding plate and movable up and down for cutting the strap as the pressing device is moving up relative to the first clamp and for pressing the part of the strap and the leading end thereof against the under side of the sliding plate, a heater for, in a forward position, being held between the part of the strap and the leading end thereof and fusing surfaces of the part of the strap and the leading end

Abstract: A method of stripping laminated foil cuttings includes a transportation device for transporting the foil cuttings in a given transportation direction. A cutting device for cutting the forward edge of each foil cutting with an obtuse angle is arranged upstream of a deflection edge along the transportation direction. At the deflection edge, a foil remainder of a cover foil of each laminated foil cutting, provided adjacent to incisions of the cover foil, is removed in a branched off transfer direction from a carrier paper of each foil cutting. The carrier paper is removed in a transportation direction in common with an advertising print or a commercial art as formed by such incisions in the cover foil and remaining on the carrier paper at the deflection edge.

Abstract: A heatable shoe for a joint welding apparatus for overlapping joint welding of asphalt roofing is designed in such a way that it will be able to produce a wave of liquid asphalt in an opening or slit between a front and a rear part of the shoe, thereby producing a maximum quantity of liquid asphalt inwards to a line approximately in the center of the overlapping portions between the roofing webs. This is where the mechanical fasteners are located, which are thus baked or embedded in and sealed by in liquid asphalt in a favorable manner.

Abstract: An apparatus for end face welding of plastic parts that includes two spaces clamping devices for retaining the plastic parts, a heating device movable into an operative position between the clamping devices, and a stop element for retaining the heating device in its operating position, and in which the stop element is automatically disengaged from the heating device upon a return movement of a carriage supporting one of the clamping devices after heating of the ends of the parts to enable automatic return of the heating device to its initial position.

Abstract: An arrangement for butt-welding tubular plastic components includes two chucking devices for holding the components in coaxial positions relative to each other and a heating device for heating the ends of the components without contact. The heating device includes a heating element which can be swung between the two chucking devices. The heating element heats the ends of the components without contact by heat rays. The heating element includes a metal plate which is coated with a ceramic coating and which is electrically heatable by heating cartridges.

Abstract: A method for manufacturing a hollow air spoiler comprising the steps of setting upper and lower parts molded from thermoplastic synthetic resin material by the injection molding method to upper and lower fixed jigs, placing a heater device between the upper and lower parts, pressurizing the upper and lower fixed jigs by bringing them together under pressure, contacting the outer layers of end faces of the upper and lower parts to the heater device under pressure, opening the upper and lower fixed jigs at the time point it has reached a desired melting degree from the outer layers of the end faces toward inside, removing the heater device from the upper and lower fixed jigs, closing the upper and lower fixed jigs, maintaining the pressure until it has reached to a desired dimension directing inwardly from the outer layers of the end faces, opening the upper and lower fixed jigs to remove a product therefrom at the time point the molten thermoplastic synthetic resin material is fixed and united, removing an out

Abstract: A portable hot sir sheet welder used for making reservoir liners and covers. The welder is sued to fuse together overlapped edges of lengthy sheets of synthetic rubber material or the like. The welder has a front carriage and a rear carriage both of which have a weight box for removably receiving cast ingot weights. The front carriage has a pair of laterally spaced main drive compression wheels for pressing the overlapped sheets together after they have had their surfaces heated to a sufficiently high temperature by a hot air shoe pounded on the front carriage. A pair of laterally spaced secondary compression wheels are supported from the front end of the rear carriage. An eccentric mechanism attached to the rear carriage provides structure for pivoting the main drive compression wheels upwardly from their pressure producing position.

Abstract: A laminating machine for paper protection, particularly a laminating machine with a motor and a transmission device located within a casing composed of an upper casing member and a lower casing member, a pair of rollers rotating in opposite direction; having a heating element, a thermal sensor, a heat distribution plate and a heater base to melt plastic film and adhere it to paper or card; and incorporated with a pair of back to back cooling plates to cool down the laminated paper or card.

Abstract: A lead frame retaining device including: a heating block, a lead retainer having a retaining plate and being installed above the heating block, a retaining-plate support on which the lead frame retainer is mounted, a positioning device which securely positions the lead frame retainer on the retaining-plate support, a presser for pressing the lead frame retainer against the retaining-plate support so that a lead frame is retained between the retainer and the heating block, and a power source for vertically driving the heating block and retaining-plate support in the opposite directions relative to each other.

Abstract: A method and apparatus for automated resistance welding of materials is provided. The material may be thermoplastic material. The material has a layer of a second material adjacent thereto. The second material is a dissimilar material which may be applied as a film or a coating on the first material, or the second material may be a separate layer placed adjacent the first material. A heating element is placed in the interface between overlapping portions of the two pieces of material to be welded together. The layers are directly adjacent to the heating element. The layers can be consolidated onto the heating element if desired. The heating element can be composed of carbon fibers in a polymer matrix. The heating element is supplied with current to generate resistive heating. The heating causes melting of the layers adjacent to and contacting the material. Pressure is applied to the area being welded to fuse the materials together.

Abstract: An apparatus serves for applying web shaped material to a substrate. The apparatus includes a frame structure having bearings for mounting a roll of the material. The frame structure supports guides for the web. A mount together with the guides are arranged in such a way that a part of the web being applied is accessible for heating by a burner arrangement. In order to obtain a secure controlling of the roll during application of the web shaped material, the guides for the web are arranged upon the frame structure in such a way that the web is moved from the roll in an upward direction, around the guides and downward around part of the outer circumference of the roll between the roll and the substrate.

Abstract: A filter support tube manufacturing apparatus and method employing operative steps of drawing wire from a reel, and moving the wire, first, through a heater for heating the wire, second, through a fluidized bed for coating the wire with a corrosion resistant material which also serves as a bonding agent and, third, through a second heater. Then, the heated and coated wire is wound onto a rotating mandrel which holds straight plastic reinforcing strips about which the wire is wound. Once winding of the wire is completed and the wire is embedded in the plastic reinforcing strips, the wound wire is cut manually and removed from the mandrel. A new end of the wire extending from the reel is inserted in the mandrel and a new set of plastic strips are installed on the mandrel. Finally, the steps are repeated to make additional filter support tubes.

Abstract: A process for the production of tighthead drums having dimensional stability of the injection molded lids and blow molded drum bodies, comprises blow molding double drum bodies from plastic and centrally separating them into two drum bodies. Tighthead lids are produced by injection molding from plastic. The tighthead lids are then welded to the drum bodies. Widemouth drums are also produced by blow molding double drum bodies from plastic and centrally separating them into two drum bodies, but with a molded-on edge at a distance under the drum opening. Drum lids are injected molded from plastic with an outside flange molded-on the lower lid edge. A sealant of plastic is injected into the lids and the lids are positioned on the drum bodies sealed with a clamping ring.

Abstract: A ribbonizing apparatus and method for forming a fiber band from a plurality of fiber tows extending along respective fiber tow pathways. The ribbonizing apparatus includes an assembly for selectively heating at least a respective one of the plurality of fiber tows as the fiber tow extends along the fiber pathways. When not needed, the heat is removed from the fiber tow. A plurality of embodiments for accomplishing the method are contemplated.

Abstract: A heat sealed butt joint for plastic parts such as a battery formed by at least a two step force application. The adjacent portions of the butt joint of the battery cover and case are preheated to a near liquid state causing rollover on the sides of the joint. The first step force application is of a lighter amount and is held for a predetermined time which causes the heated rollover on the sides of the battery to solidify. The second step force is of a heavier amount and is held for a predetermined time which causes the molten polymers of the heated portions of the battery cover and case to mix and bond together while the solidified rollover from the first step acts as a dam to prevent further rollover during the second step. The formed sealed battery has improved bursting strength and the process can be used for joining various other butting plastic parts to improve the tensile strength of the bond between the parts.

Abstract: An improved apparatus and method for producing fully air-cushioning dunnage from two sources of flexible thermoplastic film. This improved apparatus and method provides a fully air-filled dunnage by maintaining a forming roller (16) at a cold temperature. The outer surface (33) has a thermo-resistive layer (32) completely convering its periphery absent a plurality of cavities (30) formed therein. A first film (12) is heated then thermoformed into said cavities (30). The thermoformed portions of the film contact the cold cavities in the forming roller to cool both the film and the air in the cavities to a cold temperature. The heat welding surface of first film (12) is kept at an elevated temperature by the thermo-resisitive layer. A second film (20) is heated and welded to said first film by and with an adjustable heated pressure roller (24). The heat traveling through the second film and the first film is delayed for a predetermined amount of time by the thermo-resistive layer.

Abstract: Device for joining of tubular parts (10, 11) made from plastic, especially polyvinylidene fluoride, polypropylene or polyethylene, in which aligned parts (10, 11) exhibiting about the same diameter are pushed together and are welded on abutting surfaces (12, 13) by effect of heat. Abutting surfaces (12, 13) of tubular parts (10, 11) in the direction of the inside pipe space are undercut or recessed so that the edge formed by inside surface (15) of tubular part (10, 11) and the abutting surface springs back opposite the edge formed by outside surface (18) of tubular part (10, 11) and abutting surface (12, 13), and so that parts (10, 11) in the area of abutting surfaces (12, 13) in the axial direction essentially are softened equally deeply, then pushed together and, as a result, are welded together. Especially wherein the heating element (20) consists of a fixed disk (23') and a heating ring (23") of metal with a PTFE-ring (21') which may be additionally fixed.

Abstract: A new and improved method and apparatus is provided for welding together abutting end faces of adjacent dual containment pipe sections of the type described while an elongated flexible cable is present and extending between the adjacent pipe sections. The apparatus includes a unique heater element having opposed heating surfaces and openings formed along diametrically disposed confronting edges for accommodating an elongated cable element so that the pipe sections can be welded together while the cable element is in place.

Abstract: A heater for a double facing apparatus includes a flat metal plate where channels are drilled through end faces of the plate. Slots are provided at the end faces of the plate to interconnect pairs of adjacent channels at alternate ends to form a serpentine steam passage through the plate. The channels are positioned through the plate proximate to the upper surface of the plate, to define a thin web of plate material between the channel and the upper surface and a thick web of material between the channel and the lower surface of the plate. End caps are welded over the slots to seal the communication between the adjacent interconnected pair of channels. Steam supply ports extend into the serpentine path to steam pressurize the serpentine passage. Air vents can be supplied between some adjacent channels of the heater, extending between an upper and a lower surface of the plate.