Abstract: A self-supporting filter media, comprising a batt made of thermoplastic fibers, and heat induced scores provided at predetermined intervals along a length of the batt. And, a method of fabricating a self-supporting filter media, the method comprising the steps of: providing a thermoplastic batt of fibers; adding an adhesive to the batt; heating the batt and the adhesive to bind the fibers with the adhesive; heat scoring the batt at periodic intervals for producing a scored batt of fibers; and rolling the scored batt of fibers for storage or shipment.

Abstract: The present invention relates to a sheet tension adjusting method which allows the tension to a single-faced corrugated fiberboard sheet or a liner to be greatly adjusted with a high accuracy to be capable of the adjustment of upward or downward warps of the corrugated fiberboard sheet. In the method according to this invention, when manufacturing a single-faced corrugated fiberboard sheet S.sub.1 in a manner that a liner L.sub.1 is adhered onto a corrugated sheet C.sub.1, the single-faced corrugated fiberboard sheet S.sub.1 is wound around one or more rolls 1 to change a braking force to the roll 1, thereby adjusting the tension to the single-faced fiberboard sheet S.sub.1. Further, this invention is effectively applicable in manufacturing various kinds of corrugated fiberboard sheets.

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.

Abstract: Corrugating rolls for forming corrugated paperboard medium are given a flute valley profile having a narrow channel along the valley base between arcuate segments of the valley base that parallel the channel on opposite sides of a radial plane of symmetry. This valley base channel is of such depth as to relieve the fiber compression stress between cooperatively nipping flute tip and valley surfaces along the axial plane between respective corrugating rolls. One advantage of the invention is to increase the on-line time of plated rolls by limiting accelerated wear of the plating in the valley base channels of the rolls. The invention also provides an improved corrugating medium characterized by flute tips which are relatively less compressed as compared to adjacent flanking regions.

Abstract: Machine (1) and method of manufacture of a single-face corrugated board sheet whereby a fluted cardboard sheet (23) is glued to a flat sheet. The machine comprises three heating cylinders having parallel axes, tangently arranged pairwise and means (26) for positive traction driving the corrugated board sheet, said means being located downstream of the path of the corrugated board in relation to the three cylinders. The fluted sheet is pressed onto the cylinder downstream of the first contact (29) between the flat sheet and the fluted sheet, in an arc of a circle corresponding to an angle at the center (alpha) of a first predetermined value greater then zero. Said positive driving means are associated with complementary means for heating said corrugated board.

Abstract: The invention provides a process for the preparation of a starch based glue for making corrugated board. The process is carried out in a system which includes a first and relatively large mixing vessel containing a stirrer. A second and smaller mixing vessel is connected to the first vessel via a recirculation path. The second and smaller mixing vessel contains means for exerting a shearing force which is greater than the shearing force exerted in the first and larger mixing vessel. The process is carried out in two steps. A first step is to make a carrier by combining water, starch and a limited amount of lye in the large vessel. A second step adds further amounts of starch, water, borax, and a second shot of lye to the carrier while in the small vessel. Adding lye in two steps is a principal aspect of the invention. If all lye is added in one step, it must be limited to an amount which does not prematurely gelatinize the starch to a level which defeats the glue making.

Abstract: A synchronized flute double wall corrugated paperboard web is produced in a corrugating apparatus utilizing cooperatively operated single facers to provide an intermediate single face web with corrugated media on both faces, and then combining outer liners to both corrugated media immediately prior to on entry into the double backer utilizing a glue applicator that precludes glue line disturbance. The system may also be operated to produce conventional double wall board or single wall board utilizing either of the single facers. A synchronized flute double wall board provides enhanced strength and may be run on this corrugator at the same speed as single wall board.

Abstract: A first tension adjustor for adjusting the tension of a liner and a pitch measuring device for measuring the corrugation pitch of a first core board of a single-faced corrugated board are used. A first tension controller operates so that the tension acting on the liner is adjusted on the basis of the corrugation pitch of the first core board of the single-faced corrugated board. Further, a second tension adjustor for adjusting the tension of the single-faced corrugated board and a phase shift measuring device for measuring a phase shift between the corrugations of the first core board of the single-faced corrugated board and the corrugations of a second core board to be laminated to the first core board are used. A second tension controller operates so that the tension acting on the single-faced corrugated board is adjusted on the basis of the phase shift measured by the phase shift measuring device.

Abstract: This invention relates to a double facer of a corrugating machine which aims to improve a drying state or bonding state between a single-faced corrugated fiberboard sheet and a liner and improve the quality of a corrugated fiberboard sheet. In a double facer for bonding together a single-faced corrugated fiberboard sheet and a liner to form a corrugated fiberboard sheet, provided are a heating member disposed along a conveying direction of the corrugated fiberboard sheet; a pressing unit, disposed so as to oppose the heating member, for pushing the corrugated fiberboard sheet against the heating member; a sheet conveying unit, disposed downstream the heating member, for conveying the corrugated fiberboard sheet; and a sheet feeding unit for feeding the corrugated fiberboard sheet toward the sheet conveying unit; while the pressing unit comprises a plurality of pressing devices disposed in series as being separated from each other along the conveying direction of the corrugated fiberboard sheet.

Abstract: A dry blend pre-mixture composition for use in making corrugating adhesives is comprised of starch and from about 5% to about 20% of ground plant germ. The starch and germ can be derived from various plant sources and in a preferred embodiment the starch is corn starch and the germ is ground corn germ, also known as spent flake. The corrugating adhesives can be prepared by using the pre-mixture as a replacement for starch in a process for making a carrier, no-carrier or carrier-no-carrier adhesive.

Abstract: The labyrinth path in the corrugating nip of a single facer is substantially reduced by utilizing a small diameter corrugating roll captured between a larger diameter conventional corrugating roll and a backing roll arrangement. The smaller diameter corrugating roll is captured to prevent bending thereof under corrugating loads. The corrugator may be operated at high speeds without the adverse increase in labyrinth path and web tension characteristic of a pair of large diameter corrugating rolls.

Abstract: An essentially non-contact holddown system for a corrugator double backer utilizes air pressure supplied by a plenum positioned above and closely spaced from the lower heating section which supports the corrugated web. Continuous edge sealing membranes seal the interface between the lateral edges of the plenum and the web, and overlie the edges of the web so that the seal is enhanced by the holddown pressure.

Abstract: The present invention relates to a corrugated component (10) of wood-like material. The component consists of at least three layers of wooden material sheets (1,2) which are joined together with the aid of a bonding agent. At least one (1) of said layers has it grains running at an angle to the other layers (2). The undulations (9) are created before the bonding agent hardens in order to permit the layers of the wood-like material to move relatively to each other in order to compensate for the differing bending radii of the individual layers.

Abstract: A method of making corrugated board having at least one fold region includes the steps of securing at least two sheets of paper liner in complementary facing engagement to create a first multi-layer liner. A first set of ridges of a first corrugated paper medium is secured to the first multi-layer composite liner to create a first single-face web. At least two sheets of paper liner are secured in complementary facing engagement to create a second multi-layer composite liner. A first set of ridges of a second corrugated paper medium is secured to the second multi-layer composite liner to create a second single-face web. A selected portion of the second corrugated paper medium is compressed to create an area to be bent. A second set of ridges of the first corrugated paper medium is secured to the second multi-layer composite liner. Adhesive is applied to the second set of ridges of the second corrugated paper medium, except for the compressed selected portion.

Abstract: In a process for manufacturing corrugated cardboard, corrugated cardboard is produced by gluing several individual webs (10, 11, 31) to each other by their mutually opposite surfaces. Several individual webs (10, 11, 31) are conveyed to an assembly point (A) and then moved over a heating device (38). The distance between the glue application points (B, C) and the assembly point (A) of the individual webs (10, 11) varies according to the speed of the webs.

Abstract: In a single facer, the premoistened medium web is dried on both surfaces to a shallow depth immediately prior to passage through the corrugating nip. The dried shallow surface layers substantially decrease friction between the flutes of the corrugating rolls and the paper while the interior of the web is maintained in a moist condition necessary for formability.

Abstract: A method for making a corrugated fiber reinforced preform for a corrugated channel is disclosed which involves the sequential application of fiber plies to a shaping tool, each of the plies individually formed to the contours of the shaping tool, using a corrugating tools, restraining means used to maintain the plies in conformance with the tool. The plies are then subjected to debulking and heated to stabilize the fiber plies in their shaped condition, with additional plies applied thereover using the same steps of application, forming, restraining and stabilizing to produce a thick debulked fiber preform which avoids wrinkling of the fibers at the radius between the web and side portions of the corrugated channel.

Abstract: A glue application roll 1 rotating at a circumferential velocity v.sub.1 is moved to touch a downstream side corrugating roll (an upper corrugating roll) 9 rotating at a circumferential velocity v.sub.2 via a core paper 11 and, in response to variation in vibration, noise, drive torque or pressing reaction force of the glue application roll 1 caused thereby, a setting position of the glue application roll 1 to the downstream side corrugating roll 9 is adjusted, thus a gap between the glue application roll 1 and the downstream side corrugating roll 9 is maintained approximately at a thickness of the core paper 11.

Abstract: A multiple compartment package having a connecting bridge with a frangible internal barrier is made from two composite or thermoplastic sheets or webs welded together to form the front and back walls of the package, and the central bridge portion is defined by one or more partitions spanning the short distance between the webs. In the preferred embodiment, multiple partitions form a plurality of parallel compartment strips to create an obstruction to penetration of substances from one packet to the other. One process for making the invention uses a comb-shaped mask and a thermoplastic insert strip interwoven between the tines of the comb. The tines are extended down between the welding heads of the packaging machine, preventing welding from taking place between the thermoplastic sheets wherever the comb mash is, with the result that the welding occurs between the strip and an alternating one of the side webs creating a zig-zag pattern that forms the vacant barrier compartments.

Abstract: A method of making a toothed belt. A toothed belt is made by guiding a strip of fabric to pass through a thermosetting resin to soak it with thermosetting resin, then the soaked fabric is guided to pass through a pair of toothed rollers to form a series of toothed grooves thereon, thereafter the fabric is guided to pass around a plane roller and simultaneously rubber material is fed into the space between the outer peripheral surface of the plane roller and said fabric. Then, the fabric is wound onto a cylindrical mold having corresponding toothed grooves thereon and its two ends are glued together to loop around the cylindrical mold, then reinforcing cords and rubber sheets are covered over the fabric. Finally, the rubber material is vulcanized to form a toothed belt. Fabrics treated by the method demonstrate considerately greater flexibility or extendibility to comply with bending when under operation. Furthermore, the tooth contour of the belt will be more accurate than conventional ones.

Abstract: A panel adaptable for use in automotive trim applications has a laminate of a support layer and an A-side layer made of vinyl or cloth. The support layer is made of a thermoformable material such as foam, felt or polypropylene. The laminate is thermoformed to impart the contour of a rigid substrate to which the panel will be attached. The support layer retains the desired contour without the use of other materials. The panel may have a shirred appearance imparted thereto by the inclusion of a plurality of gathers thermoformed into the support layer.

Abstract: The invention relates to a method for attaching wrap-around labels to cylindrical or prismatic containers starting with cutting of a section of a label from a suitable foil material. Then, the label section is shaped or deformed, maximally to the limit of what is reversible for the material being used, at a time immediately prior to the application of the label section onto the exterior of the container. The undulated label section is placed around the exterior of the container so that the edges of the label are overlapping and an adhesion or gluing process is initiated, for example, by reaction and/or heating. Reforming of the shaped or deformed label section is retarded until the label section rests against the exterior of the container along with the permitting the simultaneous progress of the adhesive process to be completed.

Abstract: Method and equipment for the manufacture of corrugated paper products includes separate heaters for preparing liner and medium components. Data regarding these components is collected and an optimum conditioning for the components is determined.

Abstract: This invention relates to a product packaging material and method, and in particular to a product packaging material (27) formed from a length of rolled corrugated paper (20) and a method of manufacture therefor. There is provided a packaging material comprising corrugated paper (20), the corrugated paper including non-sinusoidal corrugations (16, 18, 72). There is also provided a method of making a packaging material of multi-layer corrugated paper (27) including the steps of forming corrugated paper (20) having a sheet with sinusoidal corrugations (42), and compressing the sheet to destroy the sinusoidal form of at least some of the corrugations.

Abstract: A smooth press implements the application of a covering paper against a corrugated paper passing around a ribbed cylinder or roll of a single corrugator. The smooth press comprises a series of identical support arrangements arranged side-by-side along the ribbed cylinder or roll. Each arrangement has a pad whose support surface is urged against the ribbed cylinder and is curved according to a radius approximately equal to that of the ribbed cylinder in order to cover a plurality of ribs. Each pad is movable between a position disengaged from the corrugated paper and a second position biasing the cover sheet onto the corrugated paper on said ribbed cylinder and is movable individually in a controlled fashion.

Abstract: A corrugated fiberfill structure is provided including at least one fibrous web folded to form a plurality of pleats having alternating crests and bases, each of the pleats having a pair of legs in which each of the legs has a first leg surface and a second leg surface, the first leg surface of one leg being in intimate contact with the first leg surface of an adjoining leg of the pleat and the second leg surface of the one leg being in intimate contact with the second leg surface of one adjoining leg of an adjacent pleat over a portion of each leg. At least some crests define a first structural surface and at least some bases define a second structural surface; with the distance between the first and second structural surfaces defining the thickness of the structure. The pleats of the structure are so arranged across the thickness that the density of the structure varies between the first and second structural surfaces.

Abstract: Method and apparatus for manufacturing corrugated board comprising two layers of corrugated medium joined together in tip-to-tip registration of the two mediums, without an intermediate liner, and with at least one outer liner. Adhesive is applied to the tips of the two mediums, and the tips are brought together and held in contact with each other while the adhesive sets at least partially during conveyance of the mediums along a linear path.

Abstract: Disclosed is a method for preparing a carbon honeycomb structure that includes the steps of: alternately stacking a plurality of corrugated sheets each of which is produced by corrugating a supporting base of carbon fibers impregnated with an epoxy resin prepolymer and then curing the prepolymer, and a plurality of flat sheets, each of which is prepared by curing a supporting base of carbon fibers impregnated with an epoxy resin prepolymer, through a node bond adhesive; curing the adhesive to form a honeycomb structure; dipping the resulting honeycomb structure in a phenolic resin prepolymer solution; evaporating the solvent; then curing the phenolic resin prepolymer; repeating these dip, evaporation and curing processes to coat the honeycomb structure with a predetermined amount of the phenolic resin; and cutting the coated honeycomb structure to a predetermined thickness.

Abstract: A smooth press comprises a smooth cylinder acting conjointly with a lower ribbed cylinder in order to apply a covering paper against a corrugating paper passing around the ribbed cylinder and includes a tractor arrangement downstream from the lower ribbed cylinder situated with respect to the smooth cylinder so as to form a contact angle of the covering paper against the ribbed cylinder. The tractor arrangement applies a tension force to the cardboard which creates a reactive radial pressure urging the cover paper against the corrugated paper at the contact surface of the ribbed cylinder.

Abstract: A single facer apparatus for the production of single face corrugated web includes a pressure roll having a flexible outer surface which is internally biased outwardly to provide the pressure nip for joining the liner and glued corrugated media. A pressure shoe inside the flexible roll is sized and shaped to maintain operative pressure nip contact with at least two corrugating roll flutes. This substantially reduces vibration and noise. The pressure roll is constructed with a substantially enlarged diameter with respect to the corrugating rolls, the single face web joined with a preliminary bond at the pressure nip is wrapped around a substantial portion of the pressure roll circumference downstream of the nip, and the roll is internally heated to cause gelatinization of the glue and to fix the adhesive bond.

Abstract: A sheet of loop material adapted to be cut into pieces to form loop portions for fasteners of the type comprising releasably engageable hook and loop portions, or to be incorporated into items such as disposable garments or diapers or into sheets of abrasives. The sheet of loop material includes a sheet of longitudinally oriented fibers having anchor portions and arcuate portions projecting in one direction away from the anchor portions, and a layer of thermoplastic backing material extruded onto the anchor portions to bond to the anchor portions and form at least a portion of a backing for the loop material. The thermoplastic backing material can also bond the sheet of fibers to a sheet of backing material.

Abstract: Corrugating adhesives free of incompatibility problems with water soluble partially hydrolized polyvinyl alcohol comprise a major portion of water, starch, strong base, a boric acid compound and a partially hydrolized water soluble polyvinyl alcohol composition.

Abstract: The labyrinth path in the corrugating nip of a single facer is substantially reduced by utilizing a small diameter intermediate corrugating roll captured between a pair of larger diameter conventional corrugating rolls. The two large diameter rolls capture the smaller roll and prevent bending thereof under corrugating loads. The corrugator may be operated at high speeds without the adverse increase in labyrinth path and web tension characteristic of large diameter corrugating rolls.

Abstract: A single facer has corrugating rolls of which the cross-sectional tip and root curves are elliptical (as broadly defined) to form a medium compression zone 38 beyond which, on each side of the tip center line, the root extends to define a clearance gap greater than the thickness of the medium; the root curve may (FIGS. 2 and 3) continue as an ellipse which also defines the flute flank, or alternatively the flute flank may be defined by a straight line 76 (FIG. 4) with a transition curve 58 between the straight line and the root curve 52. According to a different aspect of this invention, flank clearance is provided by the use of differently shaped flutes on the two corrugating rolls; for example (FIG. 5) the second roll 71 which carries the medium after corrugating may have straight flanks 76, and the other roll may have concave flanks 78.

Abstract: A method of making a corrugated nonwoven web of polymeric microfiber, which method comprises:(a) introducing a nonwoven web of polymeric microfiber having a solidity of 0.1 or less into a corrugating apparatus that has a plurality of paddles secured at a first end to a means for moving the paddles about a path, the nonwoven web of polymeric microfiber making contact with spaced second ends of the paddles opposite to the paddles' first ends; and(b) reducing the spacing between the second ends of the paddles to cause the nonwoven web of polymeric microfiber to become corrugated, wherein the corrugated nonwoven web of polymeric microfiber has a solidity of 0.1 or less.

Abstract: A machine for manufacturing a sheet of corrugated board by gluing a fluted sheet of board onto a liner sheet of board includes: a fluted cylinder, a central fluted cylinder equipped with an assembly for applying the fluted sheet against its periphery, a smooth cylinder for bringing the liner sheet into contact with the crests of the flutes of the fluted sheet, and a motorized smooth heating cylinder situated downstream of a path of the corrugated board and entirely at distance from the first three cylinders; an assembly for controlling and adjusting the rotational speed of the motorized smooth heating cylinder; and an assembly for adjusting and maintaining during operation the pressure of the liner sheet on the flutes of the fluted sheet over a line of contact below 3 kg/cm. The fourth cylinder presses the fluted sheet onto the central fluted cylinder over an circular arc corresponding to a subtended angle between an order of 30.degree. and an order of 80.degree..

Abstract: A method of producing and the product of heat-proof laminate boards are disclosed. Each laminate board cut from a continuous laminate has a corrugated upper layer, a middle foam layer produced by spraying foam agent onto one side of the upper layer which will expand into shape automatically, a bottom layer having opposite edges folded in conformance to the corresponding edges of the upper layer so as to sealedly confine the foam in between the upper layer and bottom layer. The upper layer can be made of one of the materials including steel plate, PVC, PC, PP, aluminum plate, iron sheet. The bottom layer is made of materials including PVC film, PP film, papery film, fabric film, nylon film or wooden fiber sheet.

Abstract: To provide a corrugating roll for a single facer which avoids generation of press marks or fracture of paper without a loss of paper by suppressing a contact pressure between a corrugating medium and a liner paper, and which may manufacture the corrugated paper in a low cost with easiness of machining work, in a corrugating roll for a single facer, in which a pair of corrugating rolls engage with each other through a tooth form in parallel to roll axes on circumferential surface portions of the rolls, a profile of a tooth tip portion is composed, in combination, of a plurality of arcs that are symmetrical with respect to a tooth apex portion. The profile of the tooth tip portion includes the tooth apex portion and is constituted in combination by a first arc having substantially the same radius of curvature as that of an outer circle of the corrugating roll.

Abstract: A cross-corrugated panel has a core between two faceplates, where the core omprises two groups of corrugated elements that are perpendicular to each other. The corrugated elements have peaks and troughs connected by diagonally-extending segments. In each group of corrugated elements the peaks and troughs in adjacent elements are 180 degrees out-of-phase with each other. The faceplates and the corrugated elements in each group are joined at the peaks and troughs. The diagonally-extending segments of one of the elements comprise flat strips whose flat surfaces are parallel to each other and perpendicular to the faceplates. To make a cross-corrugated panel, a first group of elements is provided, each element being formed by oppositely winding two strips of curable material to form overlapping helixes having rectangular cross-sections. The elements are positioned in parallel. A second group of elements of curable material is placed perpendicular to the first group of elements.

Abstract: A method and apparatus are provided for forming pleats in a thermoplastic material by feeding a continuous web of sheet-like thermoplastic material to a pleat forming apparatus and subsequently drawing the web through a bonding device. The pleat forming apparatus includes a rotating drum that has a plurality of apertures and a plurality of radially extensible teeth positioned in peripheral slots. The teeth are spring-biased inwardly to a retracted position within the drum but are extendable, under the urging of an internal cam, to a position wherein a portion of each tooth protrudes outwardly from the drum. The web is carried around the drum and the teeth protrude into the web forming pleats.

Abstract: A system for controlling the rate of heat transfer between the heating surfaces and a corrugated web in a double backer includes an air flow system operable to selectively apply a vacuum to the underside of the web via chambers formed in the spaces between the heating units or to apply pressurized air to the chambers to cool and lift the web, as necessary. A complementary system controls bowing in the surfaces of the heating units by supporting the undersides of the heating units with columns which include a thermally responsive metal member having an known coefficient of thermal expansion. The metal members are selectively heated by heating elements responsive to sensed bowing of the heating units to eliminate or minimize such bowing.

Abstract: A method and a device for producing corrugated strip packaging parts to be used for packaging cylindrical or elongated parts in separate compartments. The device includes a series of form bodies arranged on an endlessly rotating belt. The form bodies have essentially the same inside cross-section as the lower loops of the corrugated strip material formed by the device and are joined together at their base flanks by elastic material areas. The belt is guided over rerouting points that temporarily spread apart two adjacent form bodies to form an enlarged intermediate space. A form tool is arranged adjacent one of the rerouting points to engage and press the material of the packaging part into the enlarged intermediate space.

Abstract: A method of manufacturing a container for the temporary storage of foods is disclosed. The container includes a corrugated medium having a single backer paper thus creating an exposed corrugated surface on a side opposite the backer. The food container is formed such that the exposed corrugation is located towards an interior surface of the container. The method of manufacture involves fabrication of a single-face sheet of corrugated material to which is affixed a tape liner along opposed side edges of the sheet. A wider tape is affixed to the sheet intermediate the lateral edge tapes. The sheet is then cut along a longitudinal midline of the intermediate tape and also across the sheet to form discrete blanks. The blanks are substantially single-face corrugated material but have double-face corrugated material along the lateral edges where the tape was applied. Thereafter, the blank may be further cut, scored and folded to form containers having a single-face,bottom panel and double-face side walls.

Abstract: A method is provided for forming a corrugated structure from a fibrous web by first forming a fibrous web; alternatingly lapping the fibrous web; folding the fibrous web to form corrugations; brushing fibers from one corrugated peak to extend to an adjacent peak and bridge the gap therebetween; spraying resin on the corrugated fibrous web; heating the resin-sprayed corrugated fibrous web; or further sandwiching said fibrous web with a pair of outer webs with resin sprayed thereon and heating said sandwiched fibrous web. Another embodiment initially combines fibers of low melting point with regular fibers and heats the corrugated fibrous web after brushing, rather than spraying resin on the corrugated fibrous web.

Abstract: A bi-directionally corrugated sandwich construction for use in applications equiring high-strength, light-weight components is disclosed. The sandwich construction comprises first and second face sheets positioned essentially parallel to and spaced apart from each other and having a core therebetween. The core has two sets of corrugated strips which have planar peaks and troughs positioned at regular intervals. The strips of the first set are positioned parallel to and spaced apart from each other with the peaks and the troughs in phase with each other such that parallel rows of troughs are formed perpendicular to the strips. The strips of the second set are positioned parallel to each other with the peaks and troughs in phase with each other, and are positioned perpendicular to the first set of strips in the rows of troughs formed thereby.

Abstract: Corrugated paperboards are prepared for corrugation and adhesive bonding of mediums and liners by exposing the mediums liners and adhesives to radiant energy from a thermal source ranging from 1100.degree. C. to 2300.degree. C. and emitting a dominant wavelength in the range of 2.1 to 1.0 microns. The speed of adhesive bond development is increased. Polymeric adhesives may be used as alternatives to conventional starch based adhesives.

Abstract: An apparatus and method is disclosed for slidably contacting and pressing upon the back side of a conveyor to urge an advancing corrugated paperboard sheet into substantially uniform contact with adjacent laterally extending heating surfaces irrespective of any thermally induced deflection or bowing thereof. A plurality of heating chests arranged in side-by-side relation define the series of laterally extending heating surfaces. A conveyor belt is positioned opposite the series of heating surfaces for advancing the corrugated paperboard sheet longitudinally along a predetermined path of travel. A plurality of contact assemblies provides the sliding contact with the conveyor belt. Each contact assembly, in turn, preferably includes a plurality of contact shoes arranged in side-by-side relation and carried by a laterally extending supporting frame. The contact shoes have contact surfaces slidably contacting the back side of the conveyor belt.

Abstract: Corrugating adhesives free of incompatibility problems with water soluble partially hydrolized polyvinyl alcohol comprise a major portion of water, starch, strong base, a boric acid compound and a partially hydrolized water soluble polyvinyl alcohol composition.

Abstract: Disclosed is a single facer provided with a plurality of fluting units, each consisting of an upper fluted roll and a lower fluted roll which engages with the upper fluted roll and forms a predetermined corrugation on a corrugating medium to be passed between the upper fluted roll and the lower fluted roll in the corresponding fluting unit and to paste a liner onto the glued crests of the corrugating medium; the single facer comprising a single fixed supporting member disposed adjacent to and to oppose to all of the lower fluted rolls via a route of feeding the liner fed to the corresponding fluting unit; a sleeve-like endless belt wound around the supporting member to be able to run freely therearound; and a plurality of pressing members disposed to oppose, via the endless belt, to the lower fluted rolls to be parallel with the respective lower fluted rolls; the pressing members being able to be moved, while maintaining the horizontal posture, closer to the corresponding lower fluted rolls with the aid of pr

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".