Abstract: An improvement in a corrugated strip having major flat sections which extend between longitudinal edges of the strip and which are joined along lateral edges by intermediate sections extending between the major flat sections, includes stiffening ribs protruding from the strip along at least one of the connected lateral edges of the major flat and intermediate sections, the stiffening ribs being oriented substantially perpendicularly to the lateral edges. Additionally, a method and apparatus for forming corrugated strips, including corrugated strips having stiffening ribs, includes structure for applying a force, through dies, to a strip of material along an axis which is oriented at an acute angle to the strip.

Abstract: A low amplitude wave-board panel having improved bending strength and bending stiffness properties is provided. More specifically, the amplitude of the waves is substantially equal to, or less than half the thickness of said board. Preferably, the wave amplitude ranges from between 1/8" to about 1".

Abstract: The strength and workability of a reinforced composite corrugated body are improved. A corrugated body is produced such that corrugate lines provided with vertically spaced ridges and grooves formed alternately in a sheet material are formed in a smooth meandering waveform in a horizontal direction. The corrugate lines are formed by corrugating rollers to have a substantial amplitude ratio H/L higher than or equal to 0.4 but lower than or equal to 1.4, a substantial meandering ratio D/N lower than or equal to 0.35, a substantial meandering overlapping ratio higher than or equal to 0.5 and a width narrowing ratio i in the advancing direction of the corrugate lines lower than or equal to 8% plus a stretch strain ratio of the sheet material. Sectional shapes of crest and bottom portions of the corrugate lines are formed to be curved or chamfered with a small width. A flat liner is adhered to at least one of the opposite faces of the resultant corrugated body.

Abstract: A screening screen assembly for a vibratory screening machine including an apertured plate, and a bonded subassembly of an undulating support screen and fine screening screen and finer screening screen bonded to each other by a fused plastic grid and bonded to the apertured plate. A method of fabricating a screening screen assembly for a vibratory screening machine including the steps of providing a support screen, superimposing a plastic grid onto the support screen, superimposing a finer screening screen onto the fine screening screen, applying heat and pressure to the superimposed screens to fuse the plastic grid and thereby form a flat bonded laminate subassembly by causing the fused plastic grid to permeate the fine screen and the finer screen and the support screen, forming the bonded laminate subassembly into an undulating shape, providing an apertured plate, and bonding the undulating bonded subassembly to the apertured plate.

Abstract: An apparatus for the manufacture of pipes having transverse profile features has a machine bed, on which half shells, which can be combined to form a mold, are rotatably and displaceably drivable. The half shells are pressed together on a molding path by guide rails, of which one is displaceable at right angles to the direction of production by hydraulically actuatable drives. Interlockings may be provided in addition, a locking member of which engaging with an associated locking recess.

Abstract: The core of a honeycomb panel consists of a set of corrugated strips each of which alternate abut the immediately adjacent strips. Interlocking protrusions are formed in the abutting portions of the strips. The protrusions provide automatic registration of the strips without jigging or fixturing. Preferably the protrusions are somewhat undercut to provide a detent or snapping action upon assembly to provide mechanical integrity prior to bonding. The snapping action also holds the abutting surface together for uniform bonding. Lateral registration of the strips can be provided by, for example, forming a lance and window or mating dimples in the abutting surfaces. Bonding of the abutting surfaces can be done by soldering, brazing, or gluing. This honeycomb core structure is suitable for the continuous fabrication of panels of arbitrary length, width, and thickness.

Abstract: A method for continuously producing corrugated sheet from a supply of material having low melt strength at the forming temperature includes a heater, a pair of interdigitated thermo-forming rollers for corrugating the sheet as it exits the heater and a closely coupled calibrator at the outlet end of the thermo-forming rollers. A carrier maintains lateral tension on the sheet as it is heated, thermo-formed and calibrated so as to maintain its uniform lateral width. The thermo-forming rollers and calibrator form and maintain the corrugations until the material cools to below the glass transition temperature. A method for producing the corrugations is likewise disclosed.

Abstract: Chips of cardboard, in particular of packing cardboard, which are formed by cutting flat, preferably used packing cardboard lengthwise and crosswise, and the bulk volume of which is increased by copings and/or bent-over portions and/or peaks and/or recesses are provided, as is a packing unit comprising a wrapper, loosely filled at least to a substantial proportion with the bulk packing material made from a web of paper, in which the wrapper is formed by the web of paper shaped in the manner of a helical roll, the adjacent, helically extending long edges of which web are joined overlapping one another, and in which the wrapper is closed at both ends in the manner of a sack, and as is a process in which the cardboard, in particular packaging cardboard, is comminuted (cut) and is deformed to increase the bulk volume of the chips forming the packaging material, as well as an apparatus having a device for comminuting cardboard, in particular packaging cardboard, having one lengthwise and one crosswise cutting unit

Abstract: Preformed cellulosic linerboard as utilized in the manufacture of corrugated products is provided with enhanced crush strength by a combined lignin-coating and calendering treatment. The linerboard is coated with an aqueous lignin-containing solution and then, with the coating in a wet or dry state, subjected to at least one pass through a calender nip to substantially increase the CD crush strength of the treated linerboard over the CD crush strength of an untreated linerboard or a lignin treated but uncalendered linerboard. The linerboard may be laminated with a substantially air and moisture impervious sheet to inhibit bleeding of the lignin coating in high humidity conditions.

Abstract: An apparatus for cutting a honeycomb half-cell structure into sheets includes a blade for cutting the structure and a conveyor for positioning a length of the half-cell structure so that the blade cuts across the diagonal surface of the half-cell structure, thereby forming the sheets. The conveyor comprises platens including a plurality of bars contacting the valleys on one side of the half-cell structure and a space between each consecutive bar. The half-cell structure is cut along the diagonal surface alternating between one side of a first predetermined bar and one side of a second predetermined bar. A process for cutting a half-cell structure into sheets includes positioning a length of the half-cell structure so that the diagonal surfaces of the structure are positioned adjacent a blade for cutting and cutting across the diagonal surface to form the sheets.

Abstract: An apparatus for forming tubular tile, including an endless trackway having at least two substantially straight portions defining first and second molding sections, a plurality of mold blocks supported for movement about the trackway, and a plurality of mating mold blocks supported for mating with the first mold blocks along each molding section to form a segment of a corrugated molding tunnel. Extruders introduce moldable material at the beginning of each molding section, and the material is conformed to the molding tunnel along the molding sections for forming the tile, with the mold blocks being separated when they move past the end of each molding section. The extruders are mounted for movement toward the beginning of the two molding sections when initiating tile formation therein.

Abstract: A corrugated metal-clad sandwich panel with a wafer composite core is provided. The single stage process for the panel manufacture involves utilizing a press platen system which is mechanically convertible between a planar and a corrugated configuration. The metal sheet is first placed on the lower platen which is in the planar configuration. The wafers and an isocyanate resin in admixture are uniformly distributed over the metal sheet. Optionally, a second metal sheet is placed over the wafer/resin mat. The platens are biased together to precompress the mat. Finally, the platens are converted from the planar to the corrugated configuration, thus forming the corrugated metal-clad sandwich panel having a waferboard core in a single stage.

Abstract: The invention provides a control system and method for curing composite articles such as corrugated fiberglass resin plastic (FRP) panels. An exemplary system of the invention includes a curing oven, at least one infrared pyrometer sensor which is located within the oven curing zone and which provides an output indicating the temperature of the resin being cured, a tractor unit for moving the panel through the oven, and a comparator circuit which adjusts the speed of the tractor unit in predetermined response to sensor output. The invention thereby provides for the detection of the peak temperature or gelation point of resin in the panel, and allows its specific location in the oven to be controlled to optimize the performance and efficiency of the panel production line.

Abstract: A method of making a prevulcanized tread particularly useful for the recapping of tires having, in stress-free condition, a constant curvature in its longitudinal direction whose radius corresponds substantially to that of the tires to be recapped, the sole of the tread being concave, is characterized by the fact that the tread has two ends in its longitudinal direction. The method includes feeding continuously a strip of raw rubber to an inner mold moving about an axis in a curved path, closing an outer mold for the tread pattern with the inner mold so that the closed molds form a continuous molding space within which the tread is completely molded and vulcanized as the closed molds move together about an axis of rotation, and opening the moving molds to discharge continuously in the longitudinal direction the prevulcanized tread of constant curvature.

Abstract: A curved panel is formed of joined corrugated strips with a series of crimps in one side, of each strip so that the crimped side is shorter than the non-crimped side, resulting in a curved strip which is joined to other such strips in a side-to-side fashion to form a curved core with a honeycomb cells therein, and on which coverings are placed to form a panel.

Abstract: The present invention is directed to the manufacture of plastic tubing exemplified by corrugated plastic tile and parts related thereto, in which molds for shaping an extrudable plastic material are caused to shuttle linearly forwardly and rearwardly with respect to an extruding source of said plastic material. Sequentially related to linear mold movement is opening and closing mold action, which is correlated to the discharge of plastic material from the extruding source thereof. Provision is also made herein during the course of linear mold movement for parking one or more predetermined molds at a location spaced from the extruding source.

Abstract: A shape retention hose construction and method of making the same are provided, the hose construction comprising a length of flexible tubular hose formed mainly of polymeric material and having opposite end portions and an intermediate body portion that defines internal and external peripheral surfaces of the hose, and a shape retention unit carried by the hose and being adapted to generally retain the shape of the hose construction when the hose and its carried shape retention structure are jointly bent into a particular shape, the shape retention unit comprising a deformable elongated member having opposed ends, the hose having a radially outwardly disposed and longitudinally extending projection on the external peripheral surface thereof, the elongated member being longitudinally disposed in the projection, the projection having opposed ends that respectively are disposed inboard of the opposite end portions of the hose, the opposed ends of the elongated member also being respectively disposed inboard of t

Abstract: A machine and process for a web of material employing two side-by-side sets of spaced apart driven disks adapted to rotate respectively in opposite directions about two spaced apart parallel axes, the axes being sufficiently close that peripheral margins of the disks of one set run between the peripheral margins of the disks of the other set in a mated relationship, the sets of disks mutually defining a series of web driving regions spaced apart in a direction parallel with the axes, with successive web driving regions, offset from one another, open channels between said disks providing, with the driving regions, a width-wise continuous, non-linear cross-section corridor through which the web passes, the driving regions adapted to impart to a web led lengthwise into the corridor, crosswise tension in the web, pulling the web about the edges of the disks, the tension enabling the disks to apply forward driving force to the web and retarding means closely disposed to the driving regions located to apply retardi

Abstract: Apparatus for forming elongate laminate into a predetermined configuration having a substantially uniform cross-sectional shape in the axial direction, including a plurality of roller pairs having complementary transverse peripheral profiles, plate members disposed between the roller pairs and the laminate and having a transverse configuration corresponding to the peripheral profiles of the rollers.

Abstract: An apparatus for corrugating a flexible web containing heat softenable fibers comprising two pairs of endless drive chains with paddles mounted to each pair of chains to extend radially outward therefrom. The web is introduced onto the paddles at a point where the paddles are fanned out by passage of the paddles about the arcuate end of the endless chains. The web is folded between the paddles as the separation between the paddles is closed when the paddles move from the arcuate to the straight portion of the endless chains. Heating means soften and bond fibers of adjacent folds of the web together prior to removal of the corrugated web from the paddles.

Abstract: A machine and method for longitudinally compressing a web under the influence of driving forces provided at a nip line defined by spaced-apart pairs of matched rotating disks and under the influence of retarding forces provided by sets of retarding fingers inserted in the spaces between the disks.

Abstract: A flexible corrugated tube containing an integral flared end adaptor is made by applying an uncured elastomer tube about a forming mandrel as well as a flared end mold. Corrugations having grooves and ribs generally exist along at least a portion of the forming mandrel usually in the form of a cured, corrugated elastomer sleeve. Optionally, a portion of the flared end mold also has corrugations thereon. A cord is wrapped about the uncured tube thereby pressing the cord into the grooves between the corrugated ribs. The elastomeric sleeve is then cured and the cord removed.

Abstract: The invention refers to a method and apparatus for manufacturing a single-wall pipe, tube or like conduit (9,44) having smooth inner surfaces and a mechanical-strength enhancing pattern of walls, flanges or ridges on the outer surface thereof, the conduit being made of plastics or like extrudable material.

Abstract: A system is disclosed for the production of double-walled helically wound thermoplastic pipe. The apparatus includes an endless former (10) of the axially advancing and rotating type for forming a band of thermoplastic material (24) into a corrugated outer wall (26). An internal extruding device (28) extends along the core of the former and extrudes a second band (34) of thermoplastic material onto the interior of the outer wall. A cold shoe (36) presses the inner wall against the outer wall to form a smooth inner wall (42) of the double-walled pipe. It is also possible to provide for the insertion of a reinforcing profile in the corrugations of the outer wall.

Abstract: A one-sided corrugated cardboard machine comprising a machine stand with two fluted rollers in meshing engagement with each other and an auxiliary roller rotatably supported therein, the axes of said rollers being disposed approximately in a common plane preferably inclined towards the vertical, with the machine stand being supported at the underground on one side of the plane, and members cooperating with the roller pack such as deviation rollers, guide plates, scrapers for the pressure roller, and the like, being supported in a stand section on the other side of the plane, said section being a rigid frame spanning the roller pack and which is detachably yet fixedly connectible to the machine stand.

Abstract: This invention concerns a process for producing a molded thermoplastic resin by interposing during molding a thermoplastic resin different from the thermoplastic resin to be molded as a skin layer between the die surface and the thermoplastic resin to be molded. A lubricant is provided to lubricate the interface between the die surface and the skin layer. After molding, the skin layer with lubricant is removed.

Abstract: A method and an apparatus for continuously forming embossed sheets having good mechanical properties but no directional property. The apparatus has a pair of temperature-adjustable forming rolls, axial distance regulating devices to control the distance between the axes of the pair of forming rolls and a driving means for rotating the pair of forming rolls, each of the pair of forming rolls being provided with a plurality of ring-shaped blocks having a large number of projections on their circumferential surfaces; and the method comprises the steps of: introducing a sheet into a space between the pair of forming rolls, bringing the sheet into contact with the projections of the forming rolls, where the projections of the pair of forming rolls engage with one another without pressed contact, thereby making the sheet undergo plastic deformation and forming a large number of projections on both sides of the sheet.

Abstract: An apparatus and a method for forming a corrugated sheet from a flat pre-laminated thermoplastic sheet. The flat sheet received between a pair of heated corrugated metal tool sheets with the tool sheets pulled between a pair of stationary tool press plates for forming and cooling the flat sheet into a corrugated sheet.

Abstract: A filter element comprising a hydrophilic organic polymeric microporous filter membrane having a preformed substantially non-porous sealing area and a filter housing having, preferably, a hydrophobic thermoplastic sealing surface in thermoplastic sealing relationship with the sealing area. Preferably, the filter membrane is a pleated cylindrical membrane and the housing includes endcaps thereto. The preferred membrane is nylon.The preferred pleated cylindrical membrane is produced from an elongated porous filtration area longitudinally bordered by substantially non-porous sealing areas. Such a membrane may be produced by a specific casting method or collapsing the pores along the longitudinal borders of the filtration area. The filter element is particularly useful for the filtration of aqueous liquids, particularly parenteral or body liquids.

Abstract: Moisture-resistant packing cardboard of the corrugated type is prepared from flat paper sheets formed from 10% to 90% by weight of cellulose fibers and from 90% to 10% by weight of fibrils of at least one thermoplastic polymer and having a surface area greater than 1.0 m.sup.2 /gm, by heating the sheets under pressure on an undulated surface and coupling the resulting corrugated or undulated sheets with one or more flat sheets to which the corrugated sheet is adhered through the tips of the corrugations or undulations.

Abstract: A device for corrugating a sheet material with forming staggered cut corrtions, comprising a mechanism 1 for feeding a sheet material 2 to at least two punches 3, 4. The punches 3, 4 are mounted for reciprocating motion on both sides of the material 2 in the plane perpendicular to the plane of the material 2 and over the surface of the material 2 at right angles to the direction of its feeding. The device is provided with dies 12, 13 disposed on both sides of the punches 3, 4 in the direction of feeding the material 2, with a clearance being not less than the thickness of the material 2. The dies 12, 13 are adapted to reciprocate relative to the punches 3, 4 at right angles to the plane of the material 2 such that in the process of forming the corrugations the punches 3, 4 are forced in the material 2 between the oppositely lying dies.

Abstract: A stamped plastic sheet manufacturing method includes immersing a molten extruded thermoplastic sheet into a liquid refrigerant just prior to passing through a pair of stamping rolls having tooth-like or vane-like projections. In this manner, a skin layer is formed on the surface of the molten plastic sheet prior to stamping. Upon stamping, the sheet is tensioned by the confronting crests of the above tooth-like or vane-like projections and then removed from the liquid refrigerant after the interior of the sheet has been hardened to form a stamped sheet having a substantially uniform thickness.

Abstract: A packing is constructed for an apparatus for mixing or for exchange processes. The packing includes at least two zig-zag layers each of which has a number of parallel rows of substantially rectangular deflecting surfaces with alternating gaps in the inclined flanks. Bridges connect the rows of deflecting surfaces and are disposed in the troughs and at the apices of the corrugated layer.The packing can be produced by simple stamping and bending steps.

Abstract: A corrugator for receiving plastic from an extruder and continuously molding corrugated plastic tile therefrom. The corrugator has a plurality of mold assemblies which are continuously driven to roll about an endless trackway on the corrugator frame, a portion of which defines a molding section. Each mold assembly includes a pair of mold blocks mounted to pivotally open and close. As the mold assemblies enter the molding section, the mold blocks thereof pivotally close and come into abutting relationship with the closed mold blocks of preceeding mold assemblies to cooperatively form a corrugated molding tunnel. Extruded plastic is received by the molding tunnel which moves with and molds the corrugated tile. At the end of the molding section the mold blocks pivot away from and release the tile. To augment the formation the tile the mold blocks are cooled. Additionally a vacuum is induced between the extruded plastic and the wall of the molding tunnel to assure the mating thereof.

Abstract: Apparatus and method for convoluting TEFLON tubing without use of wires, rotating a mandrel which has a diameter smaller than that of the TEFLON, threading the mandrel at the other end, rotating and assemblying over a threaded portion a means in an opposite direction thereof, and supporting at each end means allowing the mandrel to pass axially therethrough and having a series of worm gears rotatingly mounted in diametrical opposite pairs.

Abstract: A method of preparing cells for the purpose of enabling one fluid to be affected by another fluid via thin membranes of inorganic artificial fibres, which membranes are corrugated all over or in part and caused to bear upon each other along discrete lines of contact so as to form through passages or compartments for the fluids. The cell is constructed of membranes of artificial fibres which have a filament diameter of at least 3 and at most 20 micrometers and are elastic. The fibres are loosely matted so that when the spaces between the fibres in the assembled cell have been filled with a fine powder which is bound with an inorganic binder the powder forms a load-bearing layer which is cohesive throughout the surface extension of the membrane and through its cross-section and in which the fibres act as reinforcement.

Abstract: The invention includes a sheet moulding machine and a roller for use with the machine. The roller is wave-shaped along its longitudinal axis and/or is cut with one or more longitudinal grooves. This roller is located in the sheet moulding machine together with an adjacent co-operating surface such as a flat-surfaced roller. The moulding composition is extruded between the rollers.

Abstract: This invention relates to a machine for and a method of making building products from a coiled sheet of thermoplastic polymer such as polyvinyl chloride. In the practice of this invention, portions of the polymeric sheet are selectively and sequentially heated and progressively bent to the desired shape by passing the sheet through a series of heating, forming and cooling stations.The simplified design of the machine enables the user to custom fabricate building products at a construction site with a resulting savings in cost. Typical products adapted to be made in accordance with the invention are exterior building siding, siding accessories and other building products.

Abstract: A method for making flexible tubing with helical corrugations by forming two tube lengths simultaneously while superposed one on top of another. Two extruded sleeves of different diameter formed of uncured vulcanizable stock are slid successively in superposed relation over an elongated internal forming member having a helical surface form with helical ridges and grooves. The resulting assembly is then wrapped with a flexible cord under tension such that successive turns of the cord are in spaced, generally parallel relation and in the grooves of the forming member to press adjacent portions of the two sleeves into the grooves. The sleeves are heat-treated in this wrapped condition to form two flexible, corrugated lengths of tubing simultaneously. The cord is then unwrapped from the lengths of tubing and the lengths are removed in reverse order of assembly.

Abstract: A paper web is passed between a pair of first and second corrugating rolls to form corrugations therein. The second corrugating roll is provided with a plurality of longitudinally spaced annular suction grooves in communication with a suction device from which subatmospheric pressure is applied through the annular suction grooves to the corrugated web, while it is travelling around the second corrugating roll, retaining the corrugations in the flutes of the roll.

Abstract: The fibrous structure of a non-woven mat is disrupted by an apparatus comprising at least one roll which has one or more upraised ribs in a chevron pattern extending helically around the roll. In processing, the mat passes under tension over at least a portion of at least one chevron roll and preferably over two chevron rolls which may or may not be intermeshing. Thereafter, the mat may be crushed or crimped by being fed through to intermeshing third and fourth chevron rolls. Additional rolls may be supplied to exert tension. The mat which exits from the apparatus has a disrupted fibrous structure and is a superior skeleton within a structure such as a polymeric foam board.

Abstract: A method for continuous production of corrugated sheets of fiber-reinforced thermosetting resins, wherein a web of pre-impregnated material is corrugated by moving the web on elongated carrier elements arranged at intervals side by side. These elements are advanced along an essentially horizontal path in the corrugating zone and a subsequent heating and curing zone, and by causing the web to hang down to a desired extent between adjacent carrier elements. The carrier elements may be arranged transversely or longitudinally to the advancing direction of the web in order to obtain transverse or longitudinal corrugations. The upper surface of the web may be provided with a layer of surface protecting and decorating, crushed stone material before or after the corrugation operation.

Abstract: A non-woven web of synthetic fibers is selectively stretched in incremental portions in a first and second station wherein the first and second station are provided with sets of rolls having grooves parallel and perpendicular, respectively, to the axis of each set of rolls to form a bi-axially stretched web. One groove pattern of the rolls is generally a sinosoidal wave with distances between grooves being less than 1.0 millimeters times the web basis weight in grams per square meter.

Abstract: Battery separators with degradation resistant rib areas are produced from nonwoven mats of thermoplastic fibers by substantially fusing the fibers in raised regions of the mat. The fusion is progressively lessened toward the base of the rib. The rib is formed by the application of heat and pressure. The mat is also supplied with other important characteristics such as small pore size during treatment to compact its fibers.

Abstract: Machine for imprinting indicia on thermoplastic corrugated tubing comprises framework with structure connected thereto for guiding tubing along predetermined path of travel. Motivator on framework moves tubing along its path of travel, and imprinting structure mounted adjacent path of travel of tubing functions to selectively move into and out of engagement with exterior surface of tubing. Imprinting structure includes print wheel with spaced apart teeth at periphery thereof arranged to mesh with corrugated tubing when imprinting structure is in engagement therewith. Conductive print type are releasably secured to print wheel at periphery thereof, and heater cartridges function to heat print type. Print wheel is selectively shifted into engagement with exterior surface of corrugated tubing as it moves along its path of travel so that heated print type softens thermoplastic to thereby heat stamp indicia of type onto corrugated tubing.

Abstract: A linear corrugator formed by at least two rows of discrete presses each of which is formed by mating pairs of press rolls having circumferentially extending mating ridges and grooves adapted to corrugate and consolidate dry formed web, is herein disclosed. The presses of one of said rows are staggered relative to the presses in the other of said rows, the maximum axial length of the nip of each of said presses must be between 5 and 36 inches.A method of consolidating a dry formed web by independently consolidating discrete laterally spaced areas of a dry formed web of at least 40" width, each of said discrete areas having a width of over about 5" but never exceeding 36", thereby to consolidate substantially the full width of said web.

Abstract: Process and apparatus for treating tubular, plastics material net comprising transversely opening out a rope-oriented net, transversely corrugating the transversely opened-out net, and heat setting the net in its transversely opened-out and corrugated state. In addition, the product thereof, having a length less than 1/350th of the maximum axially-extended length of the net.

Abstract: A fluid flow transfer apparatus is constructed by placing a pleated membrane within a central chamber in a housing, injecting liquid potting material into the central chamber, positioning the housing while the potting is still flowable such that the membrane tips to be anchored to the housing are horizontal at the bottom of the membrane body and the inner housing surface adjacent to those membrane tips is horizontal, allowing the liquid potting to flow between that surface and those lower membrane tips and settle uniformly therebetween, and curing the potting material to anchor those tips to the housing.

Abstract: Methods and apparatus are disclosed for bending mono-axially or bi-axially stretched sheets of a thermoplastically deformable synthetic resin by heating one side of the sheet above the softening temperature of the resin while the temperature on the other side is beneath the softening temperature, whereupon the resin sheet bends by itself or can be bent with forming tools.

Abstract: An apparatus for producing a corrugated sheet from a web of deformable material, for use in cooling towers and the like, includes an endless conveyor which is adapted to move along a predetermined path of travel and on which are mounted a plurality of web molding trays. The trays have a plurality of corrugations formed therein extending generally transversely of the path of travel and means are provided for selectively locking the trays on the conveyor with the corrugations located at predetermined acute angles with respect to the path of travel of the conveyor so that the angle of the corrugations formed in the web can be varied. An air knife arrangement is provided for urging the web against the corrugations in the trays to form the corrugations in the web.