Abstract: A device for producing heavy gas-filled insulating glass sheets (62, 64, 60) has two plates (4, 6), between which the insulating glass sheet (62, 64, 60) which is to be filled can be located. On the vertical edges of the plates (4, 6) there are sealing devices (12) to seal the space (10) between the plates (4, 6). On the lower edge of the plates (4, 6) there are a conveyor means (40) for insulating glass and a channel (44) for the supply of heavy gas into the space (10) between the plates (4, 6) and into the interior (60) of the insulating glass sheets (62, 64, 60). In one of the plates (4, 6) there is a seal (20) which extends solely transversely to the plane of the plate (4) from bottom to top essentially vertically and which is located for example in the (lengthwise) middle of the plate (4).

Abstract: In the resin film forming method for extruding a fused resin from an extruder die to form a resin film, the second resin forming both ends in width direction of the resin film uses a resin greater in extension viscosity than the first resin forming the center in width direction of the resin film. Thereby, even if production conditions such as resin condition and operating conditions change, faults such as neck-in and its resultant thickening at both ends of the resin film can be suppressed. In the production of a laminate by nipping a support and a resin film of a thermoplastic resin by means of a nip roller and a cooling roller while coating the resin film onto the surface of the support, the accompanying air following the rotation of the cooling roller to the nip point is shut off by blowing a gas permeable through the resin film from a gas jet nozzle toward the surface of the cooling roller.

Abstract: An apparatus and method for manufacturing a core or tube. The apparatus comprises a means for reactivating an adhesive present on at least one surface of at least one ply.

Abstract: A building board comprising a cement substrate, a top coated layer formed on the front surface of the substrate, and a plastic sheet formed on the back surface of the substrate. The plastic sheet should preferably be formed of a polyethylene sheet. Since the impregnation of water from the back surface of building board can be effectively prevented, the change in dimension of board as a whole can be minimized.

Abstract: Disclosed is a hot air welder that consecutively joins sheets of synthetic resin material together to make a large-sized pavilion or a tent fabric, or welds and seals the seam lines of waterproof textiles or the like for waterproofing process. Instead of the conventional table-shaped body, there are provided an upright-standing drive body; hot-air welding means on an upper-side of the drive body; upper and lower drive rollers under the welding means, and wherein the welding work is performed by rotating and using alternatively the upper drive roller or the lower drive roller, according to the kind of fabrics to be welded and the work-substances. Therefore the heat welding and waterproofing process may be performed more easily for more various shaped work-substances, and that the troublesome work-substances such as sleeve or shoulder parts of waterproof clothes that have various positioned and shaped seam lines may be moved and rotated easily by the worker to be heat-welded and become waterproofed.

Abstract: Heat sealing apparatus for packaging machinery and particularly suitable for form, fill and seal packaging machinery. The heat sealing apparatus is for forming a continuous lengthways extending seal (29) on a web (18) of packaging material to be fed past it. The apparatus comprises a nozzle (50) connectable to a hot gas producer (62) which produces a flow of hot gas having a substantially constant temperature. The nozzle is mounted on a carrier (52) which is connected with a servo motor drive (56). The servo motor is controlled by a control system (48) so that in use it moves the nozzle relative to the web in accordance with variations in web feed velocity such that the flow of hot gas from the nozzle can apply a substantially constant heat to the web to form the seal (29). The apparatus allows a hot air producer which outputs hot air at a constant temperature and volume flow rate to apply a constant heat along the seal area despite variations in the web feed speed.

Abstract: A machine for manufacturing corrugated board that includes a row of pressure applicators aligned substantially transverse to the direction of machine flow and configured to press a web of corrugated board against a heated platform. To prevent the pressure applicators from tilting when incompletely overlying the web of corrugated board, the machine includes a stabilizer configured to prevent one or more of the pressure applicators from tilting. The stabilizer may include support plates connected to the pressure applicators and a stabilizer strap connecting two of the support plates to prevent the pressure applicator from tilting. Alternatively, the stabilizer may include support plates connected to the pressure applicators and one or more alignment members to prevent the pressure applicator from tilting. The alignment members may be alignment blocks or rollers.

Abstract: A funnel-shaped concentrator that is attachable to the outlet of a standard cast iron burner is disclosed. The concentrator directs the flame produced by the burner toward the outlet of the concentrator causing the flame emanating therefrom to be directed toward the container being labeled. One or more layers of refractory insulating material are placed along the sides of the concentrator, the body of the burner and the top and bottom surfaces of the concentrator so as to minimize the amount of infrared radiation emanating therefrom. In this manner, the containers being labeled or on which a label has been affixed are exposed only to the flame being directed outwardly from the outlet of the concentrator and the amount of infrared radiation to which the containers is exposed is greatly reduced.

Abstract: A device for applying labels includes a roller that carries a tape that includes plural labels that run along a guide-wedge that produces a change in direction that produces the detachment of the labels. A head is connected to a suction circuit and to a blower device, whose operation are governed by a pneumatic distributor, so that when the label is detached from the tape, suction is produced so that the label is retained at the head. The label then is blown to project it energetically over the surface of a product on which it is adhered by the action of the impulsion. The head has a homogeneously multiperforated surface that facilitates the homogenous impulsion of the label.

Abstract: Typically, the frontside of a wafer is protected by a tape during backgrinding. Electrostatic charge may accumulate on the tape during the backgrinding operation. The wafer may warp after the backgrinding operation because the thinned wafer is not sufficiently rigid to counteract the bending forces resulting from the accumulation of electrostatic charge. In order to reduce wafer warpage, ionized air may be directed onto the wafer and tape to reduce the accumulation of electrostatic charge.

Abstract: A packaging filler product and machine for making the product wherein the product includes an air-filled pouch having sealed edges and spots connecting the opposing sheets of the pouch together. The machine includes a frictional belt system for gripping a bulk supply of pouched package material and that urges the bulk material past an inflation device for serially introducing air to the interior of each pouch of the package material followed by employing a heater that heat seals the opening into the interior of each pouch. A trim cutter eliminates unnecessary material and individual pouches are separated from the bulk supply by using perforations provided between adjacent pouches. A feed mechanism including the belt system is provided for moving the bulk supply of pouches from a supply spool past the heater and through the trim cutter. Tensioning and idle rollers guide the bulk supply of pouches through the machine in an in-line series.

Abstract: There is provided a process for producing a resin molded article, which includes the steps of: (1) molding a thermoplastic resin to obtain a resin molded articles; and (2) flame-treating the surface of the resin molded article to obtain a flame-treated resin molded article; wherein the process does not comprise after the step (2) any further step of printing, adhesive-coating or painting the flame-treated surface of the flame-treated resin molded article obtained in the step (2).

Abstract: A method of curing a thermosetting adhesive (18) provided at the interface of two overlapping members (12, 14), the method comprising the steps of: providing two overlapping members (12, 14) having at their interface a thermosetting adhesive (18); providing plasma discharge heating means (24) operable to produce a plasma jet (42); and operating said plasma discharge heating means (24) to produce a plasma jet (42) to heat the or each overlapping member (12, 14) and thereby cure said thermosetting adhesive (18).

Abstract: An apparatus for seaming roofing membranes to one another, wherein one of the membranes is secured to an underlying support structure by at least one protruding fastener, the apparatus including a wheeled carriage having an upwardly extending push/pull bar, a power supply carried by the carriage, the power supply driving the wheeled carriage, a heating assembly carried by the carriage and powered by the power supply, the heating assembly including a fan and a heating element, wherein the fan blows ambient air over the heating element and generate a heated airflow sufficient to fuse the roofing membranes to one another, a nozzle coupled to the heating assembly for directing the heated airflow between the two membranes, the nozzle having a pair of outer channels and an elevated center channel disposed between the pair of outer channels, the elevated channel passing over the at least one protruding fastener, and a variable pressure roller assembly coupled to the carriage, the roller assembly having a pair of out

Abstract: A device for welding overlapping roof membranes comprising a chassis, an air discharge chute and a flame distribution assembly communicating with the air discharge chute. The flame distribution assembly includes a gaseous fuel source inlet, a primary burner, and an ignition source. A control unit ignites the primary burner by the ignition source. The blower connected to an inlet port of the air discharge chute directs heat generated by the primary burner through an air discharge outlet for welding the overlapping roof membranes.

Abstract: A weld wheel assembly for disposition on a membrane welding machine, and for positioning a weld wheel adjacent a nozzle hot air outlet for pressing an overlying roof membrane heated by the nozzle against an underlying roof membrane heated by the nozzle, for welding the membranes together. The assembly includes a weld wheel rotatably mounted on an axle which is moveable toward and away from the membranes, and pressure exerting structure mounted on the machine and operable to bias the axle toward the membranes during operation of the machine.

Abstract: Framework, defining a predetermined curing area, corresponds in size and shape to a provisionally-assembled watercraft body to be subjected to adhesive curing. Openable/closeable gate, constituting one end portion of the framework, allows the provisionally-assembled watercraft body to be carried therethrough into the curing area. Positioning mechanism positions the carried provisionally-assembled watercraft body in the curing area. Warm wind blowing mechanism includes a plurality of nozzles provided at predetermined intervals on and along upper horizontal portions of the framework and gate and at a level slightly higher than peripheral edges of a hull and deck of the watercraft body to be joined by adhesive, which blow warm wind downward onto the peripheral edges of the watercraft body.

Abstract: A method and apparatus for manufacturing shaped bodies made of fibers, particles containing cellulose and/or particles containing lignocellulose which are admixed with a binder and scattered to form a mat. The mat is preheated by supplying thermal energy from an interior of the mat outwardly to a surface of the mat and then pressing the mat into the shaped body.

Abstract: A method for attaching thermoplastic strips to a roof of thermoplastic roof membranes includes the steps of providing strips of thermoplastic material, the strips each comprising an upstanding central portion extending lengthwise thereof, and opposed flange portions extending widthwise from the central portion, positioning the strip proximate a selected position on the roof for attachment to the roof, providing a self-propelled apparatus having means for affixing the strip onto the roof, and directing the apparatus along a line delineating the selected position on the roof to guide the strip into position adjacent the line and to affix the strip onto the roof membrane alongside the line.

Abstract: A method of making an interior trim panel for attachment to structure of a vehicle includes the steps of placing a trim insert into a cavity of an apparatus and over a first seal thereof. The method also includes the steps of loading a retainer over the trim insert to sandwich the trim insert between the retainer and the first seal and closing the apparatus. The method further includes the steps of filling the cavity with a plastic material and introducing steam into the apparatus to expand the plastic material to form a substrate and bonding the substrate against the trim insert to form an interior trim panel.

Abstract: Pressure roller and heating element combination for a welding apparatus and a method designed to weld a first thermoplastic sheet laid on the deck of a roof structure and secured to the deck by a line of fastening means, and an overlapping second thermoplastic sheet disposed over the line of the fastening means. The pressure roller includes a distal end, a proximal end, and a center portion which defines a groove. The groove is provided with an elastomeric cushion to smoothly ride over the line of fastening means and expel air from between welds produced on both sides of the fastening means when the apparatus is advanced in tandem with a heating element longitudinally along the overlapping portions of the thermoplastic sheets.

Abstract: A roof membrane welding apparatus capable of applying a weld to a first membrane and an overlapping second membrane. The apparatus includes a movably supported chassis, a welder attached to the chassis for heating the top membrane to at least the vicant softening point to weld the overlapping second membrane and the first membrane, and at least one weld wheel rotatably attached to the chassis and located rearward of the nozzle relative to the direction of movement of the apparatus, the weld wheel including a marker having an indicia thereon that is transferred to a top surface of the second membrane only where the first membrane and the second membrane have undergone a phase change during heating.

Abstract: A nozzle for directing discrete streams of air along separated and parallel first and second paths includes a chamber for receiving air of a selected temperature, a first outlet arm extending from the chamber and having a first outlet at a distal end thereof and in a first outlet plane, and a second outlet arm extending from the chamber and having a second outlet at a distal end thereof and in a second outlet plane, an axis of the second outlet arm being generally parallel with an axis of the first outlet arm, the second outlet plane being offset from the first outlet plane.

Abstract: An apparatus for seaming roofing membranes to one another, wherein one of the membranes is secured to an underlying support structure by at least one protruding fastener, the apparatus including a wheeled carriage having an upwardly extending push/pull bar, a power supply carried by the carriage, the power supply driving the wheeled carriage, a heating assembly carried by the carriage and powered by the power supply, the heating assembly including a fan and a heating element, wherein the fan blows ambient air over the heating element and generate a heated airflow sufficient to fuse the roofing membranes to one another, a nozzle coupled to the heating assembly for directing the heated airflow between the two membranes, the nozzle having a pair of outer channels and an elevated center channel disposed between the pair of outer channels, the elevated channel passing over the at least one protruding fastener, and a variable pressure roller assembly coupled to the carriage, the roller assembly having a pair of out

Abstract: A label printer/applicator with improved label cutting, control and application has a control valve for alternately fluidly interconnecting an applicator head with a supply of pressurized air, a suction source and a neutral position. An atomizer nozzle is positioned beneath an applicator head for activating moisture-activated adhesives often provided on labels. An air jet nozzle beneath the applicator head prevents cantilever bending of a label exiting a printer and travelling toward the applicator head.

Abstract: The present invention provides a hot air welding apparatus that provides accurate and repeatable control of the drive wheel speed. To afford very precise control of the speed and the relative rotation of the drive wheels at all times during the welding process, the present invention is provided with a computer control system and two high torque stepper motors, one for each drive wheel. The computer control system allows the speed and position of the drive wheels to be regulated with a very high accuracy. The computer control system allows the drive wheel settings to be adjusted while the seam is being welded and further includes an automatic ramp capability, a repeat mode, and a test strip mode. Further, the computer control system is capable of controlling the temperature of the air used in the welding process.

Abstract: An apparatus for applying strips of thermoplastic material to thermoplastic roofing membranes, the strips each having an upstanding central portion extending lengthwise thereof and opposed flange portions extending widthwise from the central portion. The apparatus includes a self-propelled housing having drive wheels thereon for movably supporting the housing on the membranes. A guide member is mounted on the housing for disposal over one of the strips and is adapted to receive the strip central portion and guide the strip into a position beneath the housing as the housing moves over the strip. A pressure wheel is mounted on the housing rearwardly of the guide member, the pressure wheel having a peripheral groove adapted to receive the strip central portion, and two peripheral edges adapted to engage the opposed flange portions of the strip.

Abstract: An apparatus for placing an end cap on a cylindrical workpiece includes a stationary support base, a guide member, a push bar, and an applicator device. The guide member is affixed to the stationary support base, and includes a ramp, disposed at an angle to the horizontal. The push bar is slidably movable in relation to the support base. The applicator includes a back plate which is operatively pivotally attached to the push bar at a pivot connection. The lower part of the applicator has a post attached thereto, which rides along the ramp of the guide member. Linear inward movement of the push bar, from a first position to a second position thereof, moves the applicator post up the ramp of the guide member, pivoting the applicator around the pivot connection, and causing the back plate to move from a substantially horizontal orientation to a substantially vertical orientation thereof.

Abstract: A gas heated seaming iron for heating carpet during the seaming process. The gas heated seaming iron includes a base plate. The base plate has a top side, a bottom side and a peripheral edge extending therebetween. The top side has an elongate depression therein. The base plate comprises a metal material. A shield member is securely coupled to the peripheral edge of the base plate such that the shield member covers the top side of the base plate. A lumen is defined between a bottom wall of the depression and the shield member. The shield has a first hole and a second hole therein extending into the lumen. A block portion has a bottom wall, a top wall, a front wall, a back wall and pair of side walls. The bottom wall is securely attached to the shield member, the block portion covering the first hole. The back wall has an air supply tube extending therein and into the aperture. An elongate member is coupled to and extends away from the back wall of the block portion.

Abstract: An apparatus and associated method for applying labels having a pressure sensitive adhesive on at least one face to articles. The label applicator includes a supporting structure supporting a label dispenser having a peeler bar and a label receiver. The label dispenser is adapted to remove labels from a backing strip and transfer the labels to the label receiver. The peeler bar is configured with an integral heater to heat each label as the label is passed over the peeler bar. A hot gas dispenser is attached to the label dispenser and is used to dispense a flow of heated air against the label to soften the adhesive on each label as the label is passed from the label dispenser to the label receiver. The label receiver is adapted to releasably retain the label and transfer the label onto a surface on the article.

Abstract: This invention relates to a heat sensitive glue activating labeler using one drum in which a label adsorbing portion capable of being adjusted to a size of a label.

Abstract: The Invention relates to a device for applying a decoration to containers such as for example, crates, bottles or cans. The decoration comprises an image transfer label supplied to the containers on a carrier strip. The carrier strip is pressed laterally, by means of a pressure roller, against the containers, which are fed past the pressure rollers. A heating device, such as, preferably, a hot air blower, heats the image transfer label on the application side of the carrier strip. Preferably, a flat stream of air is blown, by the hot air blower, against the line of contact between the image transfer label and the container. As a result of the use of highly local heating of the application side of the carrier strip according to the present invention, activation of the image transfer label is obtained without the carrier strip or the surface of the container being heated to a substantial extent.

Abstract: A plastic welder that is attachable to a source of heated air for the purpose of welding crystaline thermoplastic materials comprising a tip, a hook, a nose, an eyelet vent, a body, a parabolic vent, a deflector, a flue entrance, and a base. Heated air is blown through the plastic welder with some of the heated air escaping through the parabolic vent which preheats the material to be welded with the balance of the heated air being deflected into the flue entrance. The balance of the heated air flows through the body of the plastic welder, escaping through the eyelet vent, both melting the material to be welded and also heating the hook, nose, and tip of the plastic welder.

Abstract: An apparatus for applying a label to an article comprising an applicator means having an applicator surface, means to establish a negative pressure at the applicator surface, a plurality of openings to the applicator surface, means to deliver pressurized gas to the openings or a selected set of the openings, and wherein the applicator means comprises a label receiving member spaced from the applicator surface and comprising a plurality of apertures, means to feed a label onto the label receiving member at which the label is maintained by the negative pressure established at the applicator surface, and when the pressurized gas is delivered to the openings in the applicator surface, the gas passes into the space between the applicator surface and the label receiving member, and through the apertures therein to propel the label towards the article.

Abstract: In the film holder of a laminator, film sucking bores are arranged so that pitch P2 in the Y direction and pitch P1 in the X direction become gradually smaller toward laminate roll. Therefore, the laminator capable of stably performing the laminating operation even in laminating the rear end of a film sheet can be provided.

Abstract: A system and method cures a combination of a top and a bottom substrate with a resin disposed in-between. A cure device inherently warps the combination in one direction as a result of a curing operation that the cure device performs on the combination. A temperature gradient inducing device is disposed closer to one of the top and bottom substrates to create a temperature gradient between the top and bottom substrate and thereby warp the combination in a direction opposite to the one direction.

Abstract: This invention relates to a laminate substrate. An exemplary embodiment comprises a paperboard layer with a heat sealable layer secured substantially adjacent to one side of the paperboard layer. A co-extruded layer is secured substantially adjacent to the other side of the paperboard layer. The co-extruded layer has five layers: a heat sealable layer secured to the paperboard layer, a first tie layer secured adjacent to the heat sealable layer, a semi-crystalline nylon layer secured adjacent to the first tie layer, a second tie layer secured adjacent to the semi-crystalline nylon layer, and a heat sealable layer secured adjacent to the second tie layer. A fourth heat sealable layer is secured adjacent to the co-extruded layer.

Abstract: The disclosure relates to a method and an apparatus (10) for producing a packaging container for liquid foods from a packaging container blank (40) by permanently uniting and sealing at least two of its edges (61, 65) with the aid of a hot melt glue, the hot melt glue being applied along one of the two edges with the aid of a heated applicator roller (11). The circumferential surface (21) of the hot roller is preferably made of hardened steel with a coating (22) countersunk in a groove int he surface along the circumference of the circumferential surface, the coating possessing good slippage properties in relation to the hot melt glue and the coating being of a width which corresponds to the region intended for application. A counter roller (14) acts on the opposite side of the packaging laminate blank against the applicator roller for controlling the outflow of the applied hot melt glue strand.

Abstract: A nozzle for directing discrete streams of air along separated and parallel first and second paths includes a chamber for receiving air of a selected temperature, a first outlet arm extending from the chamber and having a first outlet at a distal end thereof and in a first outlet plane, and a second outlet arm extending from the chamber and having a second outlet at a distal end thereof and in a second outlet plane, an axis of the second outlet arm being generally parallel with an axis of the first outlet arm, the second outlet plane being offset from the first outlet plane.

Abstract: The invention provides an apparatus for use with containers 11 each in the form of a rectangular or square tube and having an open upper end and an outlet 25 in a top forming portion 12 of the container, for bonding a pour spout 31 to the container edge portion defining the outlet. The apparatus comprises a conveyor 41 for transporting the containers 11 so as to halt the containers successively at a bonding station, and a support 44 movable into contact with the outlet-defining edge portion of the container 11 as halted at the bonding station from inside the container for receiving the pressure of bonding. The support 44 is so disposed as to be movable into and out of the container 11 along an arc path and has a contact face 83 facing outwardly of the arc path.

Abstract: A weld wheel assembly for disposition on a membrane welding machine, and for positioning a weld wheel adjacent a nozzle hot air outlet for pressing an overlying roof membrane heated by the nozzle against an underlying roof membrane heated by the nozzle, for welding the membranes together. The assembly includes a weld wheel rotatably mounted on an axle which is moveable toward and away from the membranes, and pressure exerting structure mounted on the machine and operable to bias the axle toward the membranes during operation of the machine.

Abstract: A process and device are described for producing a continuous tubular film from a flat film web which is shaped by a shaping arrangement into a tubular film that is open on the longitudinal side with overlapping edges, the tubular film being continuously supplied to a sealing arrangement which welds the overlapping edges of the film on the longitudinal side to one another. The invention is distinguished by the fact that welding of the edges of the film in the sealing arrangement is effected by the application of hot air.

Abstract: A form-fill-seal machine in which a heated longitudinal seam sealer continuously forms a longitudinal lap seam along lapped edges of the tube being formed. This longitudinal lap seam sealer can be used in machines having conventional cross sealing jaws as well as in machines in which the cross sealing jaws move in the direction of the moving film during the cross sealing operation. The heated longitudinal seam sealer includes a wafer thin internal hot air dispenser that discharges hot air from both surfaces on the surfaces to be fused together. The heated longitudinal seam sealer also includes an external hot air dispenser that includes a plurality of hot air discharge jets through which hot air is discharges on the outer surface of one of the overlapped edges that not only provides necessary heat to cause fusion but also exerts sufficient pressure on the overlapped edge to insure proper sealing.

Abstract: In a method and molding apparatus for laminated molded bodies, a thermal-molding felt and a thermoplastic resin sheet, respectively in hot and soft condition, are set or placed on a mold face of cold-pressing-molding lower mold. A cold-pressing-molding upper mold lowers onto the lower mold to press the the thermal-molding felt and thermoplastic resin sheet. Simultaneously, cooling air is supplied to center portion of the thermal-molding felt through a blowing pipe protruding from mold face of the thermal-molding felt side and intruding into the felt accelerating circulation of cooling air and cooling of the thermoplastic resin sheet.

Abstract: A dual-weld heat welding apparatus capable of simultaneously welding a first membrane and an overlapping second membrane on opposite sides of a roof membrane fastening apparatus fastened through the first membrane and located under the overlapping second membrane. The heat welding apparatus includes a movably supported chassis, a hot air welder attached to the chassis including a nozzle having an outlet including at least one opening for simultaneously applying a weld on opposite sides of the roof membrane fastener to weld the overlapping second membrane and the first membrane, and at least one weld wheel rotatably attached to the chassis and located rearward of the nozzle relative to the direction of movement of the apparatus and capable of simultaneously applying pressure to the weld on each side of the roof membrane fastener.

Abstract: The present invention is directed to improved methods and apparatuses for manufacturing microfabricated devices, and particularly, microfluidic devices. In general the methods and apparatuses of the invention provide improved methods of bonding substrates together by applying a vacuum to the space between the substrates during the bonding process.

Abstract: A machine for laying a thermoweldable strip covering includes a movable support chassis provided with a support for a strip of rolled-up covering and for the unrolling and application of this strip, and at least one unit for the production of hot air, prolonged by an ejection nozzle provided with an outlet opening in the form of a transverse slot and whose outlet flow is directed toward the thermoweldable undersurface of the covering strip immediately prior to its application onto the support to be covered.

Abstract: A nozzle includes a body, a substantially rectangular foot, air slots and a flow restrictor. The body directs a stream of hot air into the substantially rectangular foot. The foot has a top and bottom surface that includes air slots. The foot also has an outlet across one end for the air flow. A flow restrictor is positioned in the foot, substantially along the outlet to create a back flow of pressure within the foot. The back flow of air causes an even distribution of air across the foot and out the air slots. Thus, increasing radiant heat across the surfaces of the foot.

Abstract: A process and device are used to weld plastic sheets with hot gas. Conventionally for welding with hot gas, the gas was conveyed over an electrically heated body. However, temperature fluctuations occurred that were difficult to correct and the result was a relatively high power consumption. In order to make a precise temperature guidance with a favorable efficiency possible, the gas is blown through a tubular heat conductor (10) with outlet openings (16) in its circumference wall and against a plastic sheet, and the tube body (10) is heated by an electrical current that is controlled by at least one temperature sensor exposed to the temperature of the tube body and/or the hot gas. Preferably, the tube body (10) itself is used as a temperature sensor, while its resistance, which changes with the temperature, is used to control the current intensity.

Abstract: The most important heat-sealing parameters must be able to be adapted to different conditions of use in a simple and accurate manner. This is accomplished by the hot air temperature, on the one hand, and the amount of hot air, the speed of rotation of the pressing rollers (8, 9) and/or the pressing pressure of the pressing rollers (8, 9), on the other hand, being able to be controlled via controllers (41, 37, 24, 29), wherein a basic setting of the set points of these controlled variables is performed as a function of material- and/or application-specific characteristics, and by the position of the hot air nozzle (16) in terms of height (H), distance (A) and/or of the oncoming flow angle (.alpha.) with respect to the roller gap being able to be set by motor operators (18, 19, 21) as a function of the intended use and/or the thickness of the workpiece.