Abstract: Method and machine for fabricating plasticboard wherein areas of bonding are created with localized heating and pressure.

Abstract: A skin packaging substrate which includes a corrugated paper member made of a medium member sandwiched between first and second liner members is glued to a first chipboard member on one side thereof and is glued to a second chipboard member on the other side thereof. A plastic film is applied to the exposed surface of each of the chipboard members. Perforations are provided in each of the chipboard paper members which perforations extend into the interior of the corrugated paper member. An apparatus is disclosed for skin packaging products to both sides of the substrate.

Abstract: A multi-layer member of corrugated board made of active carbon fibers having an equilibrium adsorption amount of benzene of not less than 200 mg/g and a benzene adsorption rate constant of not less than 0.2 min.sup.-1.

Abstract: The heat transfer medium for rotary air-to-air heat transferrers includes alternate planar and corrugated layers of a fiber-reinforced, heat-curable, organic resinous material. After corrugating and interleaving of the layers, the resultant structure is heated to cure the resin to a hardened state and the layers are bonded together at their points of contact to form a self-supporting, water-proof structure including a plurality of uniformly-spaced, tubular flow passages extending axially through the structure in parallel relationship parallel to the rotational axis of the transferrer. The surfaces of the flow passages exposed to air flow are coated with an aqueous coating solution containing a water-soluble hygroscropic material, such as lithium chloride, and a sufficient amount of a water-soluble wetting agent to provide a continuous film of the coating solution on these surfaces.

Abstract: One of two liners between which a corrugated medium is disposed is temporarily or expediently fixed to the medium. Upon press-forming, slippage of the temporarily fixed liner relative to the medium occurs, so that no wrinkles are produced in the liner.

Abstract: A reinforced laminate and the method and apparatus for the manufacture thereof which includes the embedding of reinforcing wire elements in plastic layers and plastic laminates to provide reinforced structures, producing a reinforced corrugated laminate including a corrugated layer with plastic layers applied to one or both sides thereof, producing a wire grid, corrugating the grid and applying overlying plastic layers and combining the planar and corrugated structures with cushioning and resilient foam materials.

Abstract: Wire reinforced paper products wherein wires are affixed to a paper layer or included within a paper structure with at least one paper layer conforming to the contour of the wires to supplement the rigidity produced by the wires and a corrugated paper structure including wires disposed therein. The paper products are manufactured in continuous processes which enable the use of one or two sets of parallel wires, the latter producing a wire grid structure. In the manufacture of corrugated structures one or two sets of wires may be included in the corrugated portion and the overlying layer or layers and in so doing the structural strength and moisture resistant characteristics of the resultant corrugated board may be increased several fold without materially increasing the cost of the board as compared with board using relatively heavy paper in order to achieve increased strength.

Abstract: A metal strip is used for elements in a regenerative heat exchanger employed for the exchange of latent and sensible heat from a warm outgoing air stream to a cold ingoing air stream. The strip is placed alternatingly in the form of flat and corrugated sheets to form flow channels for the warm and cold air. The metal strip, for example, an aluminum foil, is coated or laminated at least on one side with a paper-like hydrophillic material. The hydrophillic layer comprises a mixture of cellulose fibers and fibers with olefin hydrocarbons as basis. Furthermore, fungicides can be added to the mixture.

Abstract: A composite board structure comprising a corrugated fiberboard consisting of at least one liner and at least one corrugated paper medium bonded to the liner by means of a layer of a hot melt adhesive material, the liner being covered with a facing web of a woven or unwoven fabric which has its fibers scatteringly filling in perforations formed in the liner and sticking to the layer of the hot melt adhesive material so as to be securely fastened to the liner without use of any adhesive material between the liner and the facing web.

Abstract: A novel carrier composition for corrugating adhesives contains 1 part amylaceous material, about 3 to 5 parts water, and about 0.5 to 4 parts urea. The carrier is self-gelling at room temperature, and lowers the gel temperature of the adhesive paste to within the optimal range for use in making corrugated paperboard. The carrier is especially well-suited for use in acidic adhesive systems since its effect on the gelatinization temperature of the raw starch component is independent of pH.

Abstract: A composite board structure comprising a corrugated fiberboard and a facing web which is attached to the outer face of a liner of the corrugated fiberboard by means of a layer of a hot melt adhesive material between the liner and the facing web, the liner being formed with perforations and the layer of the hot melt adhesive material having embossed spot portions respectively filling in the perforations in the liner. Such embossed spot portions are formed by building up a partial vacuum in the open spaces between the layer of the hot melt adhesive material and the corrugated paper medium forming part of the corrugated fiberboard.

Abstract: A method and apparatus are disclosed for forming a novel corrugated paperboard web of indefinite length, which web includes a planar facer layer and a corrugated layer the flutes of which extend longitudinally the length of the web. The web is formed by splicing together sections having offset planar facer and corrugated layers of generally equal dimensions, respectively, whereby at one end the facer layer projects beyond the corrugated layer and at the other end the corrugated layer projects beyond the facer layer, the flutes of the corrugated layer extending from one projecting end to the other. Successive sections are spliced together with the projecting facer layer portion of one section overlying the projecting corrugated portion and the facing layer of another section, preferably with the adjacent portions of the corrugated layers of the two sections being in flute-enmeshing engagement.

Abstract: A structural panel material of the sandwich-type construction includes inner and outer facings and a core bonded between the facings. The core includes a plurality of blocks of lightweight core material, such as rigid or semi-rigid plastic foam, balsa wood, or a combination of plastic foam. These blocks are arranged in strips. The strips are joined together by corrugated sheet material. In a preferred embodiment, double-sided corrugated paperboard is used to join the lightweight structural strips. The resulting core material has the highly desirable characteristics of being flexible enough to conform to a mold shape under gravity and with the application of little or no external pressure so that special jigs are not required.

Abstract: A light transmitting building panel comprising a flat central sheet and upper and lower corrugated sheets secured to the opposite faces of the flat central sheet, thereby to provide a set of upper cells and a set of lower cells. The upper corrugated sheet is laterally offset relative to the lower corrugated sheet whereby each upper cell is positioned intermediate of adjacent ones of the lower cells and whereby heat conduction between the internal and external surfaces of the panel is minimized. The flat central sheet and the upper and lower corrugated sheets are formed from a light transmitting glass fiber reinforced plastic. The present building panel is particularly useful in greenhouses as roof panels and wall panels. The long span capability, the light transmitting characteristic and the unique cell arrangement of the present building panel are advantageously employed in greenhouses.

Abstract: A synthetic resin laminate composed of a supporting plate having protrusions and a foamed sheet having fine through-holes and fixed to the protrusions is produced by placing a foamed sheet extruded on the protrusions of a supporting plate heated to a temperature suitable for fusion-fixing and applying a draft to the supporting plate at a speed more than, but not exceeding 5 times the speed of the foamed sheet.

Abstract: A breaker reinforcing tape for belted pneumatic tires, a method of making such tape, and a method of constructing such tires therewith, are disclosed. The tape includes a generally sinusoidally crimped strip of uncured rubber and a plurality of similarly crimped parallel cords having their undulations following and nesting in the undulations of the crimped strip, the cords at successive apexes being secured to successive apexes of the strip. A second uncured rubber strip in a flat condition is secured to alternate ones of the apexes of the undulations of the array of cords and the crimped strip at one face of the latter. At least one frangible element is interposed in a fixed and substantially flat condition between the crimped and flat strips for releasably reinforcing and stabilizing the flat strip against inadvertent expansion that would prematurely reduce the amplitude and frequency of the undulations of the crimped strip and its associated cords.

Abstract: Rigid-when-wet, but foldable, corrugated paperboard and process of making same by applying phenolic resin to contiguous surfaces of the outer liner, the medium, and the inner liner without substantially altering the hygroscopicity of the exposed faces of the liners, and adhering the three components together before the resin is cured.

Abstract: A breaker reinforcing tape for belted pneumatic tires, a method of making such tape, and a method of constructing such tires therewith, are disclosed. The tape includes a generally sinusoidally crimped strip of uncured rubber and a plurality of similarly crimped parallel cords having their undulations following and nesting in the undulations of the crimped strip, the cords at successive apexes being secured to successive apexes of the strip. A second uncured rubber strip in a flat condition is secured to alternate ones of the apexes of the undulations of the array of cords and the crimped strip at one face of the latter. At least one frangible element is interposed in a fixed and substantially flat condition between the crimped and flat strips for releasably reinforcing and stabilizing the flat strip against inadvertent expansion that would prematurely reduce the amplitude and frequency of the undulations of the crimped strip and its associated cords.

Abstract: A plane plate of corrugated paperboard, which is produced by bonding a corrugated medium and at least one liner board with a thermoplastic resin, is shaped into a curved plate by means of a hot-press so that the resin fluidifies and allows the medium and each liner board to make individual and slipping movements during press-forming. The resin hardens upon subsequent temperature reduction and affords the curved heat and sound insulator plate a good shape retentivity.

Abstract: The present invention provides a combination board or plate made of a relatively small quantity of material and yet having a considerable thickness, a great load carrying capacity, a cushioning action and a ventilating ability.

Abstract: A novel self-adhesive type multi-layer laminated bituminous roofing membrane suitable for the formation of the roofing or waterproofing layer on roofs, floors and the like is provided. It comprises a base sheet of a sheet-like material, one or more bitumen layers coated on all or part of one or both faces of the base sheet, at least one layer of compound bitumen including both bitumen and rubber and/or resin laminated on all or part of the surface of said bitumen-coated layer on the base sheet and at least one release sheet laid over the whole surface of said compound bitumen layer.This roofing membrane is produced by uniting the bitumen-coated base sheet and the compound bitumen-coated release sheet, and can be applied over a substrate in a simple manner, without the step of melting or liquefying bitumen as in the conventional application process.

Abstract: A rigid structure is made up of two interengaging layers. One of the layers is of a generally corrugated form and has slots in the crests of the layer on one side. The second layer is made up of a series of laminae with slots in one side which fit into the slots in the first layer at an angle thereto and which lock the structure into a rigid unit.

Abstract: Lightweight, compliant, structural members comprising an assemblage of metallic strips disposed in side-by-side relationship with the edges of the strips at opposite sides of the assemblage. The edges of the strips on one side of the assemblage may be folded over to provide a smoother, more continuous working surface. Point-to-point node bonding of adjacent strips and straight and nested foils at opposite sides of the assemblage can be utilized to facilitate handling and processing and to furnish lateral support.

Abstract: A ceramic cellular structure having a cell density of up to 1600 cells per square inch and wall thicknesses down to 2 mils is produced by a process which comprises: (1) forming a slurry consisting essentially of finely divided sinterable solid particles of ceramic raw materials and a controlled amount of a plastic supporting matrix containing thermoplastic resin, a thermosetting resin, a plasticizer, an organic solvent and a small amount of a deflocculant; (2) ball milling the slurry; (3) casting the slurry in the form of a film; (4) removing the solvent to produce a self-supporting green ceramic tape; (6) molding a portion of the tape to form a corrugated first member; (7) providing another portion of the tape to form a substantially flat second member; (8) forming a first bilayer by bonding the second member to the nodes of the first member; (9) mutually bonding a predetermined number of bilayers substantially identical to the first bilayer to form a cellular green structure of a desired shape; and (10) fir

Abstract: A method of manufacturing a contact body is disclosed wherein layers of asbestos are formed and arranged so that the individual layers bear against one another at mutually spaced positions to provide a plurality of channels extending through the body from one end to the other with the layers being heated together with at least one substance containing silicon and aluminum to sintering temperature. The addition of silicon and alumina to the contact body is adjusted so that in the sintered layers the ratio, by weight, of the oxide of silicon to the oxides of aluminum and magnesium is in the range of 45-55% SiO.sub.2, 30-45% Al.sub.2 O.sub.3 and 10-20% MgO.

Abstract: A ceramic cellular structure having a cell density of up to 1600 cells per square inch and wall thicknesses down to 2 mils is produced by a process which comprises: (1) forming a slurry consisting essentially of finely divided sinterable solid particles of ceramic raw materials and a controlled amount of a plastic supporting matrix containing thermoplastic resin, a thermosetting resin, a plasticizer, an organic solvent and a small amount of a deflocculant; (2) ball milling the slurry; (3) casting the slurry in the form of a film; (4) removing the solvent to produce a self-supporting green ceramic tape; (6) molding a portion of the tape to form a corrugated first member; (7) providing another portion of the tape to form a substantially flat second member; (8) forming a first bilayer by bonding the second member to the nodes of the first member; (9) mutually bonding a predetermined number of bilayers substantially identical to the first bilayer to form a cellular green structure of a desired shape; and (10) fir

Abstract: Starch-based alkaline curing corrugating adhesives, containing a novel crosslinking agent comprising the reaction product of a selected ketone, formaldehyde and a secondary amine, are useful in the manufacture of corrugated paperboard. These adhesives are characterized by their economy, their superior overall stability and their excellent wet strength performance.

Abstract: An expandable honeycomb structure adapted to be suspended between stacks of articles of freight or between a stack of articles of freight and a wall and having spaced strips of relatively stiff material defining certain cell walls to resist sagging of the structure by its own weight and undue "hour glass" distortion due to vertical elongation of certain of the cells. In one embodiment readily foldable strips are interspersed with relatively stiff strips of corrugated paperboard having their corrugations running lengthwise.

Abstract: In a process for forming a nonwoven reinforced cellulosic material, for use in applications such as wipes and disposable clothing, which comprises applying adhesive to a ply of nonwoven scrim, bringing at least one cellulosic ply into contact with the scrim to form a substantially unbonded laminate, the improvement comprising applying pressure to discrete regions of said substantially unbonded laminate while said adhesive is in an activated condition. The application of pressure to discrete regions achieves ply attachment at only intermittent points on the scrim and can also serve to provide an embossed laminate texture. The product so formed is strong and has desirable absorbency, texture, bulk, hand and limpness.

Abstract: A wet-laid composite, soft, bulky and absorbent paper structure is prepared from two or more layers of furnish which are preferably comprised of different fiber types. The layers are preferably formed from the deposition of separate streams of dilute fiber slurries, the fibers typically being relatively long softwood and relatively short hardwood fibers as used in tissue papermaking, upon one or more endless foraminous screens. The layers are subsequently combined to form a unitary web, and the layered, unitary web is dewatered by the application of fluid forces. The moist, layered web is thereafter transferred to an open mesh drying/imprinting fabric. The application of a fluid force to the web creates patterned discrete areas of fibers numbering from about 100 to about 3600 per square inch of projected surface area on the side of the web which contacts the drying/imprinting fabric.

Abstract: The invention is directed to a laminar insulating material for electrical apparatus insulated by a fluid such as an insulating gas or an insulating liquid. The laminar insulating material includes two cover layers which are made of a material of relatively high density and an insulating material of relatively low density which is permeable for the fluid and fills the space between the cover layers.The invention is particularly well suited for the manufacture of the housings of overvoltage arresters which are arranged in the metal encapsulation of a gas-insulated, high-voltage installation. The laminar insulating material accomplishes here a faultless separation between the insulating gas in the metal encapsulation and that in the overvoltage arrester. Gases which penetrate the cover layers can be led off to the outside from the gas-permeable insulating material.

Abstract: An aqueous acidic adhesive composition is described comprising starch, polyvinylacetate, a copolymer of vinylacetate and ethylene and, optionally, a water-resistant thermosetting resin such as urea-formaldehyde or melamine-formaldehyde. The adhesive is particularly useful as a corrugator adhesive in the preparation of corrugated paperboard which requires a high wet bond strength. Because of its excellent "green bond" characteristics, the corrugators can be run at high speeds to produce a product having acceptable wet bond strengths with the important additional advantages that the bond is strong, tough and flexible.

Abstract: The product is a laminar composite of two or more adhesively bonded layers of sheet material, one of which has a corrugated surface contour at the interface between the layers. The layers are bonded together at the ridges of the corrugated surface of the one layer, and the bond on each ridge consists essentially of a series of relatively localized spots of a plastically deposited but adhesively set adhesive material. The spots are located at intervals spaced apart from one another lengthwise of the ridge, and are characterized with oblate cross sections in planes normal to the interface between the layers, resulting from the fact that the spots undergo compression in the plastic state thereof during the process. The bonding operation is accomplished by causing relative motion between the corrugated web and a series of spaced parallel lines of adhesive material which are disposed crosswise of the ridges of the web and contacted with the ridges so as to deposit the spots thereon.

Abstract: A wall structure characterized by inner and outer wall coverings and positioned therebetween at least one protective inner layer defined by a rib-like formation defining a series of pocket-like spaces between said wall coverings, which spaces embody a protective medium forming with the rib-like formation and said wall coverings a wall structure which is highly resistant to impact, fragmentation or severe damage by piercing. The rib-like formation is of a material selected from the group consisting of precipitation hardening stainless steels, mar-aging nickel steels, alloy steels and titanium alloys and having a yield strength of at least about 200 ksi. The protective medium may include a fire quenching material.

Abstract: Sections of sandwich panel structure have corrugated cores which may be formed from folded sheets or plates, the fold lines of each such section forming an oblique angle with the edges of the panel section. A composite panel may be formed from a plurality of such panel sections which join together along pairs of edges thereof, a shear plate being placed along such edges to extend between the panel surfaces to provide structural continuity between the panel sections.

Abstract: A unitary composite corrugated board structure of a double layer of single-faced corrugated board is fabricated by assembling the boards with their corrugated faces in nesting contact and then compressively cutting the layers by applying a force in a direction substantially perpendicular to the surface of the planar lining sheet of the board. The cutting operation crushes the corrugations at the cut edge into interlocking reentrant configurations which hold the boards together without the need for an adhesive.