Abstract: The continuous press for hot pressing a mat as a step in making chipboard, fiberboard, laminated board and similar composite materials comprises heated platens, upper and lower pressing plates and press belts which are guided on roll rods in a pressing region which run between the heated platens and the press belts. The roll rods are guided over a guideway around the upper and/or lower pressing plate with the help of an upper and a lower roll rod circulating mechanism which has guide chains and a roll rod feed mechanism with entrance-end roll rod feed wheels. Roll shoes are located at the entrance end in the vicinity of the guide drums for the pressing belts and the roll rod feed mechanisms. The associated press belts are guided with the roll shoes. The roll shoes also have auxiliary rolls which are guided over another guideway and which are guided on the press belt side over shape-determining guide surfaces.

Abstract: Apparatus for connecting sheet-like textile articles or webs of material.The processing of different materials in apparatuses with heating plates of constant curvature has hitherto, whenever the material to be processed has been changed, required a corresponding exchange of the heating plates in order to ensure the best possible processing of the material as a result of a more or less pronounced curvature of these. The new apparatus of the invention makes this exchange of the heating plates unnecessary by providing a heating plate which is composed of individual hollow-section heating bodies and which is connected to a supporting trestle on which lifting members act in order to adjust the curvature. As a result of this arrangement, the curvature of the heating plate can be adjusted in a reproducible way and thus adapted to the particular requirements, even during operation.

Abstract: An apparatus for treating fibre material containing liquid, comprising two rotating drums (2, 3), an endless driven belt (17) pervious to liquid and gas and extending between and passing around the surfaces (8, 9) of the drums, a feeding device (10) for the supply and a discharging device (13) for the removal of the fibre material, at least one container for collecting liquid, the liquid being displaced from the fibre material through the endless driven belt (17), a continuous wall (18) impervious to liquid and gas and extending along a main part of and at a distance from the belt (17) from the feeding device (10) to the discharging device (13) in such a manenr that a continuous space (19) is defined for the fibre material between said wall (18) and the belt (17), and at least a part of the space (19), seen in the direction of movement of the belt (17), forms one or more treating zones where liquid is displaced from the fibre web through the movable belt (17) to one or more containers.

Abstract: A dewatering device with two filtering belts comprising two endless bands guided over drums and a gap limited by the bands for a heap of debris as pressure product guided through this pressure zone, with a supporting means being allocated to one of the bands on that side looking away from the heap of debris is to be improved concerning its dewatering activity. For this purpose, the supporting means is provided in the form of a supporting plate (20) curved in the driving direction (x), which supports a sieve-like belt or band (13) in the pressure zone and shows break-throughs. The band (13) rests on a gliding plane of the curved and perforated supporting plate (20), the radius of curvature (r) of which decreases towards the driving direction (x). The supporting plate (20) is composed of a flexible material so that its radius of curvature (r) can be adjusted.

Abstract: A process for continuous fabrication of thermoplastic webs from at least one extruded thermoplastic web heated to processing temperature. This thermoplastic web is cooled under the application of area pressure down to a temperature at which smoothing of the surface is terminated. A calibrating and smoothing mechanism in the device for performing the process according to the invention consists of a double-band press which includes an apparatus for conducting heat away from the thermoplastic web in the reaction zone in which the area pressure is applied.

Abstract: A pressure device for machines for dewatering or filtering of suspensions, sludges or the like or for material to be pressed for the exertion of surface pressure on at least one circulating pressure belt which can be provided for supporting an equally circulating filter belt, which pressure device consists of an essentially completely hollow pressure bladder in the form of a closed frame in particular of essentially quadrangular shape viewed in top view of the pressure belt, which pressure bladder is subjectable to pressure medium and forms a very small, self-adjusting gap on the edge.

Abstract: A process for continuous fabrication of thermoplastic webs from at least one extruded thermoplastic web heated to processing temperature. This thermoplastic web is cooled under the application of area pressure down to a temperature at which smoothing of the surface is terminated. A calibrating and smoothing mechanism in the device for performing the process according to the invention consists of a double-band press which includes an apparatus for conducting heat away from the thermoplastic web in the reaction zone in which the area pressure is applied.

Abstract: In a double band press apparatus having an upper and lower endless press belt, each rotatively engaged over a pair of drums defining a reaction zone between opposed outer sides thereof, pressure chambers are defined on the inner sides of each of the press belts for applying a fluid pressure to material passed through the reaction zone. The pressure chambers are bound on one side by pressure plates having a sealing structure extending circumferentially about the pressure chambers, the sealing structure consisting of a continuous sealing member encircling the pressure chamber and applied in sliding engagement with the inner side of the press belts, a one-piece support plate upon which the sealing members are mounted and a continuous resilient boot which extends coextensively with the sealing members and which applies a resilient force pressing the sealing members against the press belts.

Abstract: A procedure and a means for correcting the transversal profile of a chip, fibre or equivalent mat being formed on a conveyor belt, said chip mat being formed with the aid of one or several rolls, most appropriately rake rolls, provided above the conveyor belt, in which procedure the free space for the chip mat between the last roll and the conveyor belt is adjusted transversally to the conveyor belt. In the procedure of the invention, substantially at the last roll the height level of the conveyor belt is raised and lowered stripwise transversally to the conveyor belt in order to regulate the transversal profile of the chip mat.

Abstract: A conveyor press for applying a surface pressure to moving workpieces, such as wooden planks, rubber and plastic webs and the like, has at least one pressing band arranged to be pressed against a workpiece. A pressure plate applies a working pressure to an operating portion of the pressing band; a plurality of rolling bodies is arranged in the region of the pressure plate in frictional contact with the pressure plate and the pressing band and may be returned from an outlet end to an inlet end of the pressure plate. The rolling bodies are formed as roller assemblies; each includes a row of rollers assembled in a unit. The rollers are located in alignment with one another in a final position and are rotatable relative to one another.

Abstract: A steering apparatus of both mechancial and hydraulic systems for a vehicle which devised the conventional steering box itself so as to attach a steering hydraulic valve directly to a steering case at the steering gear box, thereby being steerable by the steering gear box.

Abstract: The invention concerns a dewatering band press. The wires (2) in the press are wider than the rolls (1), and in view of sealing the edge of the pulp web (3), two rails (4) are placed outside the ends of the rolls, the wires running between the said rails, and a sealing beam (5) is placed between the rails and the wires. The solution is durable and reliable, because it has no readily worn abrading parts.

Abstract: A conveying apparatus comprises a conveyor belt and a housing disposed atop a conveying surface of the belt to form a chamber communicating with that surface. A fluid sealing assembly extends between the housing and the belt and comprises a profile cord engaging the belt surface. The profile cord is free to change its shape to conform to the belt configuration. The profile cord is mounted at the free ends of spring fingers which are anchored to the housing. The regions between adjacent fingers are sealed by a sealing strip which engages the fingers. The spring fingers are formed by providing parallel slits in a spring steel plate.

Abstract: A continuous press machine includes a pressure applying device for urging a pair of opposed endless belts toward each other to compress a sheet-like material passing therebetween. The pressure applying device includes a stationary housing defining a pressure chamber and having a peripheral edge facing and spaced slightly from a back side surface of each endless belt, and a device for supplying a pressurized urging fluid to each of pressure chambers, so that the pressure in the pressure chamber is applied to the back side surface of each endless belt so as to urge each endless belt against the material. A seal device is provided for sealing a gap between the peripheral edge of each housing and the back side surface of each endless belt facing the peripheral edge, so as to prevent the pressurized urging fluid in the pressure chamber from flowing through the gap.

Abstract: An extended nip press has a looped belt mounted over a shoe having a concave surface which presses the belt against a mating surface on a roll to provide an extended nip. The shoe has a support which is movable in a skewing sense relative to the longitudinal axis of the roll. Lateral movement of the belt is monitored. When it has moved beyond predetermined limits in either direction, the shoe is skewed to alter the frictional forces on the belt as it passes over the shoe's surface. This controls the position of the belt and keeps it centered in the nip.

Abstract: In a double-band press for the continuous pressing of material webs which require hardening temperatures which are too high to be withstood by the seals of pressure chambers in the double-band press, a pressure plate of the double-band press is divided into an edge area and an inner area, with the edge area having a temperature which is capable of being withstood by the seal material, while the inner area is heated to an increased temperature suitable for processing the material webs. During operation of the apparatus, heat is conducted from the inner area to a portion of the press belt lying against it. The pressure plate is formed with a rectangular recess in which is arranged a pressure plate insert forming the inner area. The pressure plate insert is heated and includes thermal conducting elements which are in contact with the pressure plate insert with one surface and which, with another surface, contacts the press belt in sliding engagement.

Abstract: A press with cooperating endless belt, fixed platens and having movable rolls fed between the platens and belts. Plural aligned wheel means are provided for feeding and spacing the rolls as they enter the pressing zone between the platens and belts.

Abstract: A dual belt press comprises opposed movable belts and a chamber disposed adjacent one of said belts for containing a medium to be applied to such belt. The chamber is defined by a frame. A seal for the medium is carried by the frame. The frame includes a holder attached to said frame and defining a serpentine groove. The holder comprises separate ledges disposed on opposite sides of the groove and defining the groove. Each ledge comprises a plurality of pieces abutting each other in the direction of belt travel. Pieces on opposite sides of said groove are mutually separable in a direction transverse to the direction of belt travel. A sealing strip is mounted in the groove.

Abstract: A double band press is used for processing a continuous sheet material passing through the press. The press includes a rigid press frame including reversing drums mounted in bearing supports on the frame. An upper and a lower endless press belt run over different ones of the drums and each press belt in combination with a pressure plate and sliding seal form a pressure chamber for exerting pressure against a reaction zone located between adjacent runs of the press belts. The sliding seal is positioned within a groove in the pressure plate and is displaceable and is pressed toward the inner surface of the press belt. A fluid pressure medium in the pressure chamber provides the pressing action on the press belt. The sliding seal includes a metal body with a surface facing the inner surface of the press belt and a dry surface layer is provided in the surface facing the press belt so that the dry surface layer is in sliding frictional contact with the press belt.

Abstract: A process of heating parts of a double band press used in pressing a material moving through the press involves heating a heat transfer medium and flowing it through the press parts in a first direction and, at specific time intervals, reversing the direction of flow so that it passes in the opposite direction. By periodically reversing the direction of flow, differential thermal expansion is avoided within the press parts. In a device for carrying out the proces, a supply line and a return line are connected to a device for heating the return heat transfer medium. A reversing valve is connected to the supply and return line so that the direction of flow of the heat transfer medium through the press parts can be reversed for providing a balanced heating effect.

Abstract: A device for applying surface pressure to an advancing plate-shaped workpiece comprises two endless pressing belts positioned at two opposite surfaces of the advancing workpiece, and two pressure plates spaced from the respective pressing belts and forming pressure chambers containing pressure medium which presses the working strands of the pressing belts against the opposite surfaces of the advancing workpiece. Each pressure plate has a groove engaging an elongated hollow hose filled with the pressure medium and supported against the working strand of the respective pressing belt and limiting the pressure chamber.

Abstract: A multi-nip high pressure press is disclosed, which can be connected to double, longitudinal or circular strainer machines but where this press is a single machine, using an additional pressing segment including at least one pair of rollers of lesser diameters mounted in advance of a pair of compression rollers.

Abstract: In a double band press each of the press belts has an associated pressure chamber in which fluid pressure medium acts to pressurize the sheet form material passed between the press belts. Each pressure chamber is formed by a pressure plate, the associted press belt and a sliding surface seal mounted in a groove in the pressure plate with the seal in sliding contact with the press belt. The sliding surface seal is secured within a retaining member fitted with narrow play into a groove in the pressure plate. Each press belt extends horizontally between a pair of spaced rollers. The retaining member is vertically displaceable within the groove. Support members located within the pressure chamber secure the retaining member to the pressure plate. A groove seal in the form of an O-ring is located between the base of the groove and the retaining member and is in contact with the opposite sides of the groove.

Abstract: A device for applying surface pressure to a movable workpiece, for example a plate of wood, comprises two pressure-applying endless belts on which pressure is exerted by means of pressure air contained in two pressure chambers. Each pressure chamber is defined by a back side of the belt, a pressure plate and a sealing provided on the pressure plate. The sealing includes longitudinal wave-shaped sealing strips extended along the longitudinal edges of the pressure plate and transversal strips.

Abstract: A particleboard press for converting a thick mat into a thin panel has a frame, an upper beam and a lower beam carried on the frame and vertically confronting each another, respective upper and lower platens carried on the beams and vertically confronting each other, and respective upper and lower belts having stretches engaged under and over the upper and lower platens, respectively. The belts are synchronously driven so as to advance a mat in a transport direction through the press between the platens. One of the beams is vertically displaceable on the frame relative to the other beam and its platen has relative to the direction a downstream calibration portion and an upstream compression portion at least limitedly vertically displaceable relative to the one beam and the downstream calibration portion.

Abstract: A belt-type press for making particleboard has a longitudinal row of transverse frames through which pass upper and lower longitudinally extending press beams extending along and carried on the row of frames flanking respective heated press platens in turn flanking stretches of respective upper and lower belts driven to move a mat of particles to be pressed along the path in a transport direction. The upper beam is pressed down by a plurality of substantially identical hydraulic actuators to compress the mat between the belts with a relatively high pressure in an upstream compression region of the press and with a relatively low pressure in a downstream compression region of the press. The upper platen and beam have a downstream calibration portion and an upstream compression portion, the latter being elastically deflectable upward relative.

Abstract: An arrangement for applying a surface pressure upon movable workpieces, has a rotatable pressing band with a working run applying a pressure against the workpiece, a pressure chamber formed by a part of the working run, a pressing plate, and a sealing member arranged on an edge of the pressing plate, and a lubricant supplying system including at least one lubricating nozzle formed in the sealing member and at least one lubricant discharge opening provided in the sealing member with its surface abutting against the pressing band.

Abstract: The invention relates to a dual-belt press for a continuously advancing web of material comprising a rigid press frame, deflection drums mounted for rotation on bearing bridges of the press frame, upper and lower endless press belts guided over the deflection drums and pressure plates disposed at the rear sides of the press belts for exerting pressure on the web of material. So that the web of material may be simultaneously calendered in such a press, at least those deflection drums provided on the entry side of the press are mounted for movement relative to the pressure plates and are adapted to be tensioned against one another by adjusting means such that the pressure exerted in the gap between these drums (calendering) is preferably greater than and independent of the pressure exerted by the pressure plates.

Abstract: The invention relates to a continuously operating press for pressing an advancing web of material, comprising a rigid press frame, an upper and a lower endless press belt, each guided over a pair of deflection rollers mounted for rotation on the press frame, comprising a heating device to heat at least one deflection roller of each pair, comprising a reaction zone located between the upper and lower press belt strands facing each other for pressing the advancing web of material with the simultaneous application of heat, and comprising pressure plates with a heating device at the rear sides of the press belt strands remote from the reaction zone for exerting a pressure on these rear sides and, consequently, on the web of material.

Abstract: The invention relates to a continuously operating press for pressing an advancing web of material, with an upper and a lower endless press band, each guided over a pair of deflection rollers and comprised of several interlocking band layers, and with a press zone for the web of material located between the lower strand of the upper and the upper strand of the lower press band. In order to prevent destruction of the surfaces of the band layers and mutual "seizure", provision is made for the band layers forming a press band to be lubricated on their mutually contiguous surfaces.

Abstract: A double band press of modular construction for use in laminating operations is adaptable to different processing operations and conditions. The press includes two endless press bands each driven in an opposite direction around a pair of drums. A support structure carries the press bands and drums. On one side of the press, part of the support structure is arranged so that it can be at least partly disassembled for exchanging parts of the press and adjusting other parts so that the length, width and height of the press can be adapted to a particular operation and operating conditions.

Abstract: A continuous-acting press, such as used in press laminates, chipboards, fiberboards, plywood, electrical laminates and the like into a continuous web, is made up of an upper and a lower multi-layered band set. Each band set passes over a pair of return rollers and includes a plurality of mutually contacting press bands. Lateral displacement of the press bands in the multi-layered band sets is prevented since alternating grooves and lands are formed in the contacting surfaces of the press bands so that the lands and grooves interengage. The grooves and lands are continuous in the travel direction of the band sets. To close the reaction zone formed by the space between the upper and lower band set, a wire travels along each of the opposite sides of the space at the same speed as the material being pressed and each wire seats in a pair of grooves formed in the mutually facing surfaces of the upper and lower multi-layered band sets.

Abstract: The device for gluing sheet-like textile articles contains a spreading station (15), a heating station (16), a pressing station (17) and a take-off station (18). The plate-shaped heating zones consist of several hollow-profile heaters (25) which are arranged next to one another and on the rear contact side (28) of which panel heaters are attached, each panel heater having at least one electrically heatable heating device (heating wire). The heating wires can be controlled each individually or in groups.

Abstract: In a device for applying surface pressure to advancing workpieces like boards of wooden material etc. with at least one continuous compression belt against the inside of which a compression plate acts, several pressure chambers are distributed along the width and/or the length of the effective pressure surface of the belt. Each pressure chamber consists on the one hand of a sealing strip and on the other hand of the facing surfaces of the compression plate and of the compression belt. The sealing strips are resiliently secured against and can be released from the compression plate by a strip-like diaphragm that demarcates a pressure space.

Abstract: Three paperboard webs are glued to one another with as little expenditure of energy as possible. After leaving the gluing apparatus, the finished sheets cut to size are ready for shipment. The middle paperboard web is passed through between two steel rolls which apply glue homogeneously to both sides of the web. High linear pressure is produced in the region of the generatrices of the steel rolls respectively touching the web. Such pressure is necessary in order that a highly viscous polymeric synthetic or natural adhesive, preferably with a solids content of more than 50%, can be used. No special drying facilities are needed, and the water-soluble glue allows recycling without problems.

Abstract: A filter press having a main press with an after-pressing device spaced from the outlet end of the main press which device carries out the final pressing and is composed of at least two press roll pairs (1,2), made up of rolls (3,4,5,6) between which the wires (7,8) belonging to the main press pass with the pulp (9) being filter pressed interposed between the wires and pressed by action of a pressing force (F) directed against the topside rollers (3,5) of the press roll pairs and produced by a force applicator such as a pressure cylinder (10). The pressure ratio (F.sub.1 /F.sub.2) between the topside rollers (3,4) and the bottom side rollers (5,6) is adjustable by the aid of a control setup.

Abstract: The invention relates to a dual belt press for the continuous production of laminates with two heated, rotating endless belts running over rollers, the laminate being guided between the opposite outsides of said belts, with heating plates which, through annularly enclosed seals, contact the insides of the endless belts, and with a fluid, pressure-cushion-forming pressure medium in the spaces formed by the seals, belt insides and heating plates to exert the necessary pressing force on the laminate. To improve the transfer of heat from the heating plate to the reaction zone it is proposed that the spaces filled with the pressure cushion contain additional heat bridges which, in forming a good thermal conduction contact, are, on one side, connected to the heating plates and, on the other side, rubbingly contact the belt insides.

Abstract: An extended nip press having a press nip formed between a first press roll and a looped traveling belt wrapping a portion of the roll with the belt having a shaped mandrel therein with a concave surface conforming to the roll facing the nip and a concave surface facing away from the nip conforming to a support roll with lubricant between the mandrel and belt and the rolls having a deflection control means with the mandrel being self-positionable during operation of the press.

Abstract: The present invention relates to a process of forming an extended elongate product from a plurality of strands by subjecting the strands to heat and pressure. The improvement of the present invention comprises a method for compressing the strands in a manner to reduce internal stresses imparted to the product during its subjection to pressure.

Abstract: An arrangement for the support of press bands in double band presses includes a press band with a roller bed supporting the rear side of the press band. Seals are positioned between the roller bed and the rear side of the press band. A heating plate is disposed within said roller bed and is in spaced relation with the press band. Support-bearing bars are supported on the heating plate and extend between the heating plate and the rear side of the press band. Shafts extend through bores in the support-bearing bars and needle rollers are mounted on the shafts. The ends of the needle rollers in adjacent rows are offset. Filling elements are positioned within and fill out the hollow spaces between the rollers. The parts in the roller bed form rolling gaps, capillary gaps and support bearing gaps and these gaps are limited to a minimum and a lubricant is filled into the gaps.

Abstract: A band press for a fiber web contains a cylinder having a solid surface over which there is guided the fiber web, for instance a paper web, which experiences a pressing or squeezing action in conjunction with a felt or wire and a press band which is impervious for a pressurized fluid medium. To accomplish the pressing or contact action there is provided a press housing containing a plurality of pressure chambers or spaces for pressurized fluid medium and with such pressure chambers operating at different pressures. The paper web is guided in a manner such that it bears upon the surface of the cylinder. The press housing is provided at the location where there outbound or depart the bands with a sharp departure or runnoff edge by means of which the bands are separated from the paper web which continues to remain at the cylinder.

Abstract: A method and a machine for the production from relatively thick flat pieces of frozen meat, for example roast beef, of thin slices suitable for roasting or grilling. The method is characterized by the fact that the flat meat pieces, before thawing above the freezing point taking place, are passed through a channel-shaped space of flat rectangular cross-section and of decreasing height in the direction of conveyance, which space is formed between two opposite endless conveying belts running in the same direction and in which the meat pieces are mangled and rolled to a desired final slice thickness substantially without loss of meat juice and blood.

Abstract: In a double band press the compressing pressure is applied to the endless bands by pressure plates via intermediate pressure rolls. The pressure rolls extend transversely to the running direction of the steel bands and are interconnected at their ends by a guide chain. More than two pressure rolls are associated with each pair of connecting bolts of the guide chain. The axes of the pressure rolls are parallel and are offset transversely relative to the axes of the connecting bolts of the guide chain. In this manner, a stable connection of the pressure rolls among themselves is made possible, with the pressure rolls having a smaller diameter and being capable of being arranged closely adjacent to each other. A more uniform and higher distribution of pressure may be obtained thereby.

Abstract: In method for the dewatering of naturally moist, coarse lump peat or of a similar material, the material is continuously fractured into particles to approximately 2-3 cm diameter and is dispersed onto a lower screen belt. With the leading in of a provided upper screen belt the material is conveyed between the two screen belts through a preliminary dewatering zone, where at a pressure which is only given through the tension of the screen belts in a loop on at least one pair of rolls, a homogeneous filter cake is produced. The latter is pressed in a subsequent dewatering zone of a number of pairs of nip rolls at a pressure increasing along the zone between screen belts, whereby in each case between the screen belt and the nip roll a pressure belt, equal in width to the screen belt, is carried long, consisting of an elastic, watertight material, but which is designed to receive and carry away the filtrate and to stabilize the material which is to be pressed.

Abstract: An apparatus pressure treats a moving web by pressing the web against a surface. The apparatus comprises a continuous link chain and a chain support. The chain support supports a moving length of the chain close to the surface so the length of chain has a shape complementary to the shape of the surface. A length of web moving with the chain is pressed between the chain and the surface.

Abstract: Apparatus for producing reinforced plastic sheets and reinforced plastic sheet laminate structures on a high speed continuous basis and which sheets and laminate structures may have widths ranging from relatively narrow to very wide. The apparatus comprises a means for bringing one or more layers of resin impregnated, fiber-containing, reinforced plastic composite material into contact with each other or into contact with surfaces of one or more endwise abutted relatively flat panels. The apparatus is provided with a pair of continuously rotating belts having a gap there between which receives the laminated sheets. A housing forming a plenum chamber faces the interiorly presented surface of one of the belts and causes a body of pressurized air to be formed between the housing and the interiorly presented surfaces of the belt. Preferably, a similar housing creates a pressurized air body between such similar housing and the other of the belts.

Abstract: A method for high speed continuous production of reinforced plastic sheets and reinforced plastic sheet laminate structures which may have widths ranging from relatively narrow to very wide. One or more layers of resin impregnated, fiber-containing, reinforced plastic composite material is brought into contact with surfaces of one or more endwise abutted relatively flat panels. The panel or panels are then passed between a pair of continuously rotating belts. A pressurized air body is formed in a plenum chamber which faces the interiorly presented surface of at least one of the belts and which air body is between the housing forming the plenum chamber and the interior surface of the belt. Preferably, a similar housing creates a pressurized air body between such similar housing and the other of the belts. In this way, the pressurized body of air forces the belts into intimate contact with the layers forming the reinforced plastic laminate structure.

Abstract: In an apparatus for applying surface pressure onto advancing workpieces including at least one rotating pressing belt whose interior is acted on by a pressure plate, a plurality of smaller pressure chambers are arranged over the width of the effective pressure area of the pressing belt. Each one of these pressure chambers is divided into an inner pressure chamber and an outer pressure chamber so that the compressed air first builds up in the inner pressure chamber and then, with a delay, in the outer pressure chamber. Moreover, the inner fitting may be provided with a blocking device which temporarily blocks the supply of pressure medium to the outer pressure chamber.

Abstract: In an apparatus for applying a surface pressure to progressive moving workpieces comprising at least one rotating pressure belt having a workpiece carrying surface and an opposed surface and means for applying pressure to said belt to cause said belt to apply pressure to said workpiece, said pressure application means comprising a sealing strip in sealing abutment with said opposed surface of said belt, said sealing strip together with said belt forming part of a pressure chamber into which a pressure medium is induced the improvement comprising the provision of a plurality of pressure chambers over the length and width of said belt in its workpiece carrying region.

Abstract: A machine for sealing polyethylene bags or the like of the type having conveyer bands for gripping and transporting the bags to be sealed at a constant velocity from the machine's inlet end, through a heating station, then through a cooling station to the machine's outlet end. The conveyer bands are formed from a material having good release (non-stick) characteristics with respect to the fused thermoplastic. Disposed at the heating and cooling stations, respectively, are heating and chilling bars (heat transfer bars), each being disposed in pairs on opposite sides on and in proximity to the conveyer bands. Means are provided for cyclically opening and closing both pairs of bars relative to the conveyer bands and for translating the bars longitudinally in reciprocating fashion with respect to the moving bands.