Abstract: The present invention relates to a process for the manufacture of a three-dimensional nonwoven, a manufacturing line for implementing this process and the resulting three-dimensional nonwoven product. Process characterized in that it consists in using a folding element (5) to apply, to an incoming web containing a proportion of thermoplastic fibers and/or filaments or fixing material, an initial fixing of the fold of the incoming web in the form of peaks and troughs, brought about by blades extending radially on ends of the folding element (5), this initial fixing being applied either by maintaining the folding element (5) itself at a set temperature, or by heating the incoming web. The invention is more particularly applicable to the textile industry, especially the manufacture of nonwovens.

Abstract: A nonwoven industrial fabric, and a method of constructing the fabric. The fabric comprises at least one layer of a polymeric film having a plurality of apertures extending from an upper surface through to a lower surface. Adjacent pairs of the apertures define land areas therebetween, and selected land areas comprise protrusions extending from at least one of the upper surface and the lower surface of the layer to form a profile to the respective surface. The method comprises optionally pre-embossing the film, cutting the film to provide the plurality of apertures, applying pressure to selected land areas to form the protrusions to create a contoured profile, and treating the film to set the contoured profile. Additional surface treatment can be provided, and two or more layers can be secured over each other for multilayer fabrics. The invention provides a simplified and economical construction, while maintaining stability and strength.

Abstract: In a corrugating machine and a method of producing corrugated cardboard, provision is made for a marking device by means of which a color mark is applied by rubbing off a solid coloring agent, the color mark being detected by means of a detection device in order to easily and precisely mark and cut out joining points. The applied and detected color mark enables a web length of a web of single-faced corrugated cardboard in a storage device to be determined, thus allowing an electronic control device to operate a cross-cutting device in an easy and precise manner.

Abstract: An extrudable polyvinyl chloride composition comprising from 80 to 99.9 percent by weight polyvinyl chloride for use in extruding a first part and a second part, wherein a fusion joint between the first extruded part and the second extruded part is formed by: A) composition at least a portion of a first terminal edge of the first extruded part and a first terminal edge of the second extruded part; B) engaging the melted terminal edges; and C) maintaining pressure between the engaged terminal edges to create a fused joint having a strength that is at least 50% of the tensile strength of the extruded part as measured by ASTM D638-2a. The extruded parts can be pipe sections.

Abstract: A method for producing diaper component parts (3) from strip material (5, 8), wherein the strip material (5, 8) is fed continuously, by means of conveying means (6), along a straight path (P) extending through a number of work stations (9, 16, 21) synchronized with one another; and wherein, along the path (P), the strip material (5, 8) is secured to the conveying means (6) so that all points of the strip material (5, 8) travel at the same speed.

Abstract: The invention describes a device and method for making corrugated products. The device can be used with any substrate and includes, at least, first and second drive rollers for driving a middle substrate and a single wall corrugated product. In other embodiments the invention includes upper drive rollers, lower drive rollers and middle drive rollers for driving an upper substrate, a lower substrate and a middle substrate. The middle substrate is driven between the upper and lower substrates at a higher velocity to form flutes that are anchored between the upper an lower substrates thereby forming a corrugated product. The invention also provides for customized corrugated products having multiple fluted substrates in various desirable arrangements. Examples of such products include mattress, partition panels, other furniture and construction products.

Abstract: A method and apparatus are useful to produce a corrugated product. They can be used to produce a corrugated product at low temperature, such as room temperature. A zero-contact roll is used to support a web of medium material on a cushion of air at a location prior to the web entering the corrugating labyrinth. The web is free to move toward or away from the surface of the zero-contact roll, on the cushion of air, in response to small oscillatory changes in downstream tension demand based on the fluting frequency in the corrugating labyrinth. A mechanism is also provided to precisely control the mean tension in the web prior to entering the corrugating labyrinth at a low value. Thus, mean web tension is precisely controlled and is low, tension oscillations can be damped, and low temperature corrugating can be achieved without significant fracturing in the corrugated web. A single-facer useful to apply a high-solids content adhesive, also desirable for low-temperature corrugating, is also provided.

Abstract: An extrudable polyvinyl chloride composition comprising from 80 to 99.9 percent by weight polyvinyl chloride for use in extruding a first part and a second part, wherein a fusion joint between the first extruded part and the second extruded part is formed by: A) composition at least a portion of a first terminal edge of the first extruded part and a first terminal edge of the second extruded part; B) engaging the melted terminal edges; and C) maintaining pressure between the engaged terminal edges to create a fused joint having a strength that is at least 50% of the tensile strength of the extruded part as measured by ASTM D638-2a. The extruded parts can be pipe sections.

Abstract: A method of making tough, water-proof building panels depositing a first fiber-rich layer onto a support, the first fiber-rich layer having a width defined by first and second side edges, a length direction, and a top surface; placing foam blocks on the first layer, lengths of the foam blocks extending generally between the first and second side edges of the first fiber-rich layer; depositing a second fiber-rich layer onto the combination of the first fiber-rich layer and the foam blocks, thereby to develop an uncured precursor to the building panel; and curing the uncured precursor to the building panel thereby to make a generally rigid structural building panel.

Abstract: Two paper webs, saturated with a B-phase phenolic resin and dried, are conveyed through separate low melting point metal alloy baths, one web after being corrugated, to convert the resin to a fully cured phase, whereafter the webs are joined to form a structurally rigid waterproof single face corrugated web.

Abstract: The invention relates to a machine for the manufacture of a web of corrugated board which is conveyed in a working direction and comprises at least one smooth liner and at least one corrugated medium that has corrugation tips and corrugation troughs, the corrugated medium being applied by adhesion to the at least one liner at least in the vicinity of the corrugation troughs, wherein a quality assessment device for assessment of the quality of the adhesive bond between the at least one liner and the at least one corrugated medium is provided, which comprises at least one ultrasonic transmitter that is disposed on one side of the web of corrugated board and at least one ultrasonic receiver that is disposed on the opposite side of the web of corrugated board and is allocated to the at least one ultrasonic transmitter; and a control anti evaluation unit which, in a manner for data transmission, is connected to the at least one ultrasonic receiver for evaluation of the signal of the ultrasonic receiver.

Abstract: An extrudable polyvinyl chloride composition comprising from 80 to 99.9 percent by weight polyvinyl chloride for use in extruding a first part and a second part, wherein a fusion joint between the first extruded part and the second extruded part is formed by: A) composition at least a portion of a first terminal edge of the first extruded part and a first terminal edge of the second extruded part; B) engaging the melted terminal edges; and C) maintaining pressure between the engaged terminal edges to create a fused joint having a strength that is at least 50% of the tensile strength of the extruded part as measured by ASTM D638-2a. The extruded parts can be pipe sections.

Abstract: In a corrugated cardboard machine and in a method of producing a web of corrugated cardboard, an electronic control device is provided in order to avoid downtimes of the corrugated cardboard machine, said control device being designed such that at least one web length of the web of corrugated cardboard between the at least one production device and a longitudinal cutting device is detectable and an application width of the at least one production device is variable in dependence on the at least one web length. Changing the application width prevents an escape of glue from the sides so that there is no need for cleaning.

Abstract: A method and an apparatus for manufacturing corrugated boards are disclosed. The method may include the steps of supplying a first web of medium having a first and second sides, wherein each side of the first web having a plurality of flutes, and wherein each flute having a crest, applying a wetting agent and an adhesive composition in a sequential fashion to the plurality of flutes on the first side of the first web, and securing a second web of medium is to the plurality of crests on the first side of the first web to form a single-faced corrugated board.

Abstract: A filter and method of making is provided. The method comprising: forming a plurality of sheets of filter media, each sheet of filter media having an inlet end and an outlet end, wherein each of the plurality of sheets of filter media are formed by the steps of: thermoforming a first layer of filtration media to have a plurality of channels, the first layer having an upper surface and a lower surface; sonically welding a portion of a second layer of filtration media to the first layer of filtration media to form the sheet of filtration media, the sheet of filtration media having a plurality of fluid channels each having an inlet opening at one end of the sheet and a sealed end at another end of the sheet; and securing the plurality of sheets together by applying a strip of adhesive between each upper surface of each first layer facing the second layer of another sheet of filter media stacked upon the upper surface of the first layer of the filtration media.

Abstract: A honeycomb containing a thermoplastic material, high modulus fiber and thermoset resin has process steps of fracturing the thermoset resin, bending, molding or forming the honeycomb in a mold or over a form, heating to allow flow of thermoplastic material and cooling of the honeycomb to retain the shape of the mold or form.

Abstract: The present invention relates to insulated containers useful for serving, for example, hot beverages. Specifically, the present invention relates to multilayer containers comprising a corrugated sheet as an inner insulating liner wherein the liner comprises interruptions.

Abstract: The invention relates to a method and a device for shaping a metallic flat material to give a metallic wave profile, in which the flat material is passed between two meshing tooth systems of two rotating, toothed rolls. For setting a desired profile height, the centre distance between the rolls can be adjusted, and for presetting of a profile cross-section the flank clearance between the meshing tooth systems can be adjusted. The invention furthermore relates to a method and a plant for the continuous manufacture of a composite material from a metallic wave profile shaped with the aid of the above-described method or the above-described device, and at least one further flat material, which is firmly joined to the wave profile to give the composite material.

Abstract: An automatic machine for producing corrugated sheet elements, particularly for packaging, thermal insulation, soundproofing and the like, comprising elements for continuously corrugating a first ribbon that moves longitudinally, a feeder for feeding a second flat ribbon in step with the first ribbon, and a device for joining one another the first and second ribbons in discrete regions.

Abstract: Methods and apparatus for manufacturing a radio frequency identification (RFID) enabled corrugated paperboard are provided. The apparatus includes a corrugated paperboard feed device configured to supply a quantity of corrugated paperboard, an antenna attach device configured to couple an antenna to the corrugated paperboard, a curing device configured to provide curing energy to the antenna to at least one of dry the antenna and facilitate optimizing an electrical conductivity of the antenna, and an attach mechanism configured to couple a radio frequency identification circuit to the antenna.

Abstract: The invention can be defined in its most general form as a building unit, namely the sandwich panel with light core from corrugated sheet material in the form of zigzag crimp, and can be used in aircraft construction, as well as in shipbuilding and construction. Making use of the claimed invention will improve the weight efficiency, the strength and the manufacturability of the panel. The beneficial effect is attained due to the fact that the plane slanting ridges are connected along the protrusion and recess zigzag lines by means of curvilinear parts, whose radius is not less than the core material thickness, whereby along said parts is a line perforation enabling the adhesive material to get into the holes of the perforation in the course of core-skins assembling.

Abstract: The present invention relates to a producing method of a laminated filter that carries out a corrugating operation and an adhering operation of filter media in the same step. A corrugation forming apparatus (20) sandwiches first and second filter media (12, 14) in their superposed state, and heats and presses the first and second filter media (12, 14) at the softening temperature of the second filter medium (14) to corrugate the filter media (12, 14), and thermally adheres the first and second filter media (12, 14) to each other. With this, it is possible to carry out the corrugating operation and the adhering operation of the first and second filter media (12, 14) in the same step.

Abstract: A method form forming fluted filtration media is provided. The method includes forming fluted filtration media having a repeating pattern of flutes wherein at least one flute in the repeating pattern of flutes comprises at least one ridge in a flute period between adjacent same side peaks. The repeating pattern of flutes can comprise at least one flute having at least two ridges provided in a flute period between adjacent same side peaks. An apparatus for forming fluted filtration media is provided.

Abstract: A paper-constructed object usable to form a high strength structure is itself formed using a fiber-powder paper product. The fiber-powder paper product is formed from a biodegradable plastic base material and fiber-powder surface coating material. The fiber-powder surface coating material is applied to at least one surface of the biodegradable plastic base material. The paper-constructed object includes a top sheet, a middle sheet and a bottom sheet of the fiber-powder paper. The middle sheet has a plurality of projections formed in it. The projections can be pyramidal, with a square base and side surfaces that are equilateral triangles. The plurality of equilateral 4-sided pyramidal projections are contiguous and extend between the top and bottom sheets. The four base edges of the equilateral 4-sided pyramidal projections are bonded to the bottom sheet and the tips of the equilateral 4-sided pyramidal projections are bonded to the top sheet.

Abstract: Source contacts of driver transistors are short-circuited through the use of an internal metal line within a memory cell. This metal line is isolated from memory cells in an adjacent column and extends in a zigzag form in a direction of the columns of memory cells. Individual lines for transmitting the source voltage of driver transistors can be provided for each column, and the source voltage of driver transistors can be adjusted also in units of memory cell columns in the structure of single port memory cell.

Abstract: A corrugated cardboard assembly comprises a plurality of adjacent sheets of corrugated cardboard arranged in a layered fashion to form a corrugated block. The adjacent sheets are not attached to one another using any adhesive. Instead, the block formed by the layered, adjacent sheets of corrugated cardboard is enveloped by a wrap-around carton that maintains the adjacent positioning of the sheets. The sheets, individually and collectively, include at least one opposing straight, narrow cut, opening, aperture, or “slit,” that is defined within them. The wrap-around carton includes means for interlocking a portion of the carton with a longitudinally-extending slot that is formed by the slits that are defined within each of the adjacent sheets of corrugated cardboard. In this fashion, the block formed by the adjacent sheets is maintained without the use of extra glue or adhesive to maintain the structural integrity of the block of adjacent sheets.

Abstract: An air filtration media pack is provided having a plurality of layers of single facer media. The layer of single facer media includes a fluted sheet, a facing sheet, and a plurality of flutes extending between the fluted sheet and the facing sheet and having a flute length extending from a first face of the filtration media pack to a second face of the filtration media pack. A first portion of the plurality of flutes are closed to unfiltered air flowing into the first portion of the plurality of flutes, and a second portion of the plurality of flutes are closed to unfiltered air from flowing out of the second portion of the plurality of flutes so that air passing into one of the first face and the second face of the media pack and out the other of the first face and the second face of the media pack passes through media to provide filtration of the air. The fluted sheet includes repeating internal peaks facing toward the facing sheet and repeating external peaks facing away from the facing sheet.

Abstract: According to the present invention, there is provided a hose assembly with an inner fluoropolymer layer having a somewhat smooth inner surface and an outer polyamide layer having an undulated surface.

Abstract: The present invention discloses a method for laying a sheet over the lower surface of a base material disposed in a generally horizontal position. According to the method, the base material is supported at the lower surface thereof by a first support means, and the sheet is placed immediately below and in facing relation to the lower surface of the base material and then supported at the lower surface thereof by a second support means. The sheet and the base material are made to be in contact with each other over partial surfaces thereof. Subsequently, the first support means is moved away from the base material and the sheet and the base material are placed together on a rigid horizontal surface so that the sheet is laid substantially over the entire lower surface of the base material.

Abstract: Method for manufacturing corrugated board or the like, whereby different material strips (3-6) are fastened together by means of a bonding agent, whereby one or several material strips (3-6) are guided along at least one press-on device (15-16), where they are guided over one or several elements (10-14), in particular supporting elements, and are pressed against them by means of a series of movable press-on parts (19), wherein for pressing on these press-on parts (19), use is made of magnetic forces.

Abstract: Fluted filter media includes filter material having a plurality of flutes formed therein having alternating ends of adjacent flutes closed to force fluid through filter material. A first embodiment of the filter media includes tapered flutes which have the open ends of the flutes larger in cross-section than the closed flutes, wherein the upstream open flutes converge toward the downstream end and the upstream closed end flutes diverge toward the downstream end. A second embodiment includes filter media which is asymmetric formed with dissimilar upstream and downstream flute cross-sections with larger flute openings to the upstream side of the filter. A third embodiment includes filter media with an upstream edge crushed to improve flow at the upstream edge. A fourth embodiment includes filter media with the upstream sealing material recessed from the upstream edge for reducing effects from blockages at the upstream edge of the filter.

Abstract: The method of forming pleated filter media includes providing a generally planar web of filter material, folding the web to form a pleated web having a plurality of fold lines, arranging the plurality of pleats in a first spaced configuration defined by a first distance between adjacent pleat tips, applying a continuous strand of adhesive to the web, and adjusting the arrangement of the plurality of pleats into a second spaced configuration defined by a second distance between adjacent pleat tips. The web has a front face and a rear face. Each fold line is intermediate oppositely sloping first and second wall surfaces. The plurality of fold lines form a plurality of pleats having a first plurality of pleat tips and a second plurality of pleat valleys. The second distance is different from the first distance.

Abstract: A double walled reinforcement structure and method for making a double walled reinforcement structure having a plurality of longitudinally extending and nested structural members. Each structural member comprises a first cell having a first cross-section and a second cell having a second cross-section. The second cell is positioned within the first cell and the second cell contacts the first cell in a plurality of locations to provide mutual support of the cells in a manner increasing the tensile and compressive strength of the structure.

Abstract: A laminate of thermoplastic polymeric films comprises a fluted ply A and non-fluted ply B, adhered to one another in bonded zones along some of the flute crests the fluted ply A. The wavelength of the flutes is preferably no more than 3 mm. Ply A has a generally uniform thickness or can have attenuated zones of lessor thickness extending parallel to the flute direction, each bonded zone being located mainly within an attenuated zone. The flutes can be sinuous with crests on both sides of ply A and can be adhered on each side to a ply B. The flutes can be filled with filler material, including reinforcement strands, and one or both sides can be perforated. The method and apparatus employ aligned grooved fluting rollers and a grooved laminating roller.

Abstract: Web constructions with severed elongate strands located on at least one surface are described. The severed elongate strands are attached to one or both major surfaces of a web and may be arranged in rows and columns. The elongate strands may be formed by extruding continuous strands onto a web construction, followed by selective attachment of the strands to the web at intervals. After attachment, the elongate strands may be severed at locations between the points of attachment. The severed elongate strands may be used as fastening elements on a web backing. When used as fastening elements, the webs may be used in, e.g., garments (gowns diapers, training pants, etc.), bedding, etc. Other uses may also be envisioned for the webs with severed elongate strands, e.g., personal care products (skin debridement articles, etc.), abrasive articles, polishing articles, filters constructions (where, e.g., the severed elongate strands serve as filtering elements and/or spacers), etc.

Abstract: A method and apparatus for the handling and containment of a cover tape peeled from a pocket tape in a component feeder are disclosed. A single folding pulley comprising inclined sides and an undercut at the hub folds the adhesive contaminated edges back onto themselves so as to captivate the adhesive therebetweeen. A cover tape reservoir, having an internal cavity defined by a curved perimeter and treated sides, stores the folded cover tape. The remaining reservoir capacity is monitor in software for fullness. The cover tape is corrugated to allow for maximum packing density with a minimum of voids as it is pushed into the reservoir.

Abstract: Disclosed is a method for preparing a corrugated sandwich panel including the steps of: extruding melted polyethylene resin by use of an extruder and a slit nozzle; molding the extruded polyethylene resin to a vertically corrugated inner sheet by use of a plurality of molding rolls; supplying a lower sheet from the lower portion of the inner sheet and an upper sheet from the upper portion thereof; forming a plurality of melting grooves by use of heaters each provided between the upper sheet and the inner sheet and between the lower sheet and the inner sheet such that the melting and bonding between the upper sheet and the inner sheet and between the lower sheet and the inner sheet is conducted; and pressing the upper sheet, the inner sheet and the lower sheet each having the plurality of melting grooves formed thereon by use of a plurality of press rolls.

Abstract: Novel starch-based glue paste compositions are disclosed composed of (i) a carrier paste containing 5 to 16 wt % of a starch selected from the group consisting of corn starch, wheat starch, rye starch, oat starch, barley starch, potato starch, tapioca starch and pea starch, each being native starch or chemically modified starch, or any mixture thereof and (ii) a main paste with a total starch content of 25 to 50 wt % composed of a mixture of 10 to 30 wt % native rice starch or an acetylated version thereof having an amylose content of 12 to 20 wt %, 1 wt % other compounds and a complementary amylopectin content of 87 to 79 wt %, and 90 to 70 wt % of a starch or mixture of starches selected from the above defined group. Processes for the manufacture of the novel glue paste compositions based on the Stein-Hall method are disclosed, as well as a premix of starches for said manufacture.

Abstract: A filter includes first and second sheets of filter media, the second sheet being pleated and forming with the first sheet a plurality of axially extending flow channels having lateral cross-sectional shapes with two adjacent included angles each greater than 45° and less than 75°. Forming apparatus and methods are provided.

Abstract: An apparatus and method for fabricating corrugated composite stiffeners provides a base tool having grooves formed in an outer surface and a roller having a rotating shaft and a removable, lobed, elastomeric member surrounding the shaft. The lobes of the elastomeric member form a radial array around the shaft and match the contours of the grooves in the base tool. A section of prepreg fabric is placed between the roller and the base tool, and the roller is rotated to sequentially engage the lobes with the grooves, the lobes pressing the fabric into the grooves, the fabric conforming to the contours of the grooves. Several layers of fabric are applied, then the elastomeric member is released from the shaft, laid out flat, and placed on the fabric on the base tool, the lobes locating in the grooves. The base tool, fabric, and elastomeric member are enclosed in a vacuum bag and heated to cure the fabric.

Abstract: A method and apparatus for producing a honeycomb structure in a continuous production process includes five process stations. At Station 1 sheets of deformable material are interleaved with a release ply to form a five layer sandwich. At Station 2 the five layer sandwich is corrugated. At Station 3 the two deformable sheets are separated and an adhesive is applied to one. At Station 4 the two deformable sheets are connected to form a single layer honeycomb structure. And at Station 5 a plurality of single layer honeycomb structures are cut and stacked to form a honeycomb structure of a desired thickness.

Abstract: A coating system (66, 68), winding system (158), finishing system (274, 276) and manufacturing system (FIGS. 6, 7, 22-29) is provided for spiral-wound fluted filter media (74, 130).

Abstract: A method for manufacturing an absorbent article including: a topsheet formed from a nonwoven fabric; a backsheet; and a cushion layer disposed between the topsheet and the backsheet is achieved by applying heat to a cushion layer unwound from a material roll to restore the bulkiness of the tissue layer, blowing air into the cushion layer for rapid cooling after the application of heat to maintain the restored bulkiness of the cushion layer, and laminating the topsheet, cushion layer, and the backsheet onto each other.

Abstract: The invention relates to a folded honeycomb structure and to a method and device for producing said folded honeycomb structure from a corrugated core web. The folded honeycomb structure has a number of adjacent corrugated core strips which lie in one plane and are interconnected by cover layer strips. Said cover layer strips are folded about 180° and are perpendicular to said plane. According to the inventive method for producing the folded honeycomb structure, interconnected corrugated core strips are produced first by making a number of longitudinal scores in a corrugated core web. These corrugated core strips are then alternately rotated through 90° respectively so that the cover layer strips fold and the folded honeycomb structure is formed. The device corresponding to this method consists of a number of rotating blades for making the longitudinal scores and a number of guiding elements for rotating the interconnecting corrugated core strips.

Abstract: A composite sheet comprising an upper layer 2 and a lower layer 3 both made of a substantially inextensible sheet which are partially bonded to each other at a large number of joints 4. The upper layer 2 forms a large number of outward hollow projections 5 in the area other than the joints 4. The projections 5 and the joints 4 are arranged such that the projections and the joints alternate in one direction to make lines and that the projections in each of the lines are out of alignment with the projections in the adjacent lines.

Abstract: A control system for a corrugating machine and a method for determining a length of paper web in a corrugating machine having a bridge are disclosed, the method including the steps of calculating an approximate length of the paper web on the bridge using photoelectric detectors, applying a liquid pattern on a portion of the paper web for a short duration, initiating a count at the application of the liquid pattern, detecting the liquid pattern with a moisture detector, terminating the count at the detection of the liquid pattern, calculating a determined length of the paper web based on the count and the detection of the liquid pattern, comparing the determined length to the approximate length, and adjusting the approximate length to equal the determined length.

Abstract: In one embodiment, the device comprises: a counter-acting cylinder (1) provided with a plurality of points (1P) and interacting with an adhesive dispenser (7), a pressure roller (3) and a laminating roller (5); the points on the counter-acting cylinder have a density and dimensions such that the technical and functional and/or aesthetic characteristics of the web material are not appreciably altered, and such that the two layers (V1, V2) are joined by means of the adhesive applied by said dispensing roller at the positions of the points.

Abstract: A machine for producing corrugated cardboard incorporates a corrugating roll and a glue roll extending parallel to the former in such a way that a glue gap is formed between the two. To adjust the glue gap, the bearing of the glue roll is pushed against the bearing of the corrugating roll with a contact-pressure force A. By means of an adjusting unit the distance of the two bearings is reduced until the force of the bearing contact pressure, which is measured by a force measuring unit, decreases due to a contact occuring between the glue roll and the corrugating roll. The glue roll may have stop rings at its ends to prevent a direct contact between the glue roll and the corrugating roll.

Abstract: The method includes the stages of gluing of a plurality of layers of sheet material (2, 3, 4); and stamping of all the layers (2, 3, 4) together; with sticking together of the previously glued zones being carried out at the same time as the stamping of all the layers (2, 3, 4). The machine includes gluing stations (12) (2, 3, 4); and a stamping station (13) which includes a pair of pressing elements, which stamp and stick together said previously glued layers. The laminar element is formed from a plurality of layers of sheet material (2, 3, 4) and can include one or several cavities (5) of polygonal profile, or else said layers are of sinusoidal profile. A higher manufacturing output of the laminar layer is achieved and it permits the forming of a laminar element with cavities or undulations of any desired shape, without limitation on the thickness of the layers.

Abstract: A structural panel has one or more face sheets bonded by adhesive layers to a core body having two outer plastic liner sheets fusion-bonded to linear ends of inner plastic truss elements spaced apart with open spaces therebetween extending in a plane direction of the plastic liner sheets. The sheet-to-sheet adhesive bonding provides a high-strength laminate bonding that is very resistant to delamination, simple and inexpensive, and can be carried out by a preferred continuous sheet bonding technique. The all-plastic core body is highly resistant to moisture attack, and the open spaces between truss elements provide flexibility to accommodate thermal expansion and contraction. The truss construction of the core body provides high compressive and shear strength, while minimizing the amount of material required to be used. In one preferred embodiment, two metal face sheets are used, and the core body has plastic liner sheets fusion-bonded to a corrugated plastic core sheet.