Abstract: Two embodiments of a process for producing concentrated suspensions of polyurea microcapsules especially suitable for manufacturing carbonless copy paper (CCP) are disclosed. Either embodiment can be a batch or continuous process. In the first embodiment, a liquid hydrophobic phase comprising a core material and polyisocyanate at least partially soluble therein is emulsified with an aqueous continuous phase including a polyhydroxylated colloidal stabilizer to form a suspension of microdroplets of the hydrophobic phase. A polyamine such as diethylenetriamine reactive with the polyisocyanate and a catalytic amount of an alkaline base are then added, initiating an interfacial polyaddition reaction at alkaline pH which forms the polyurea microcapsules. The alkaline base is preferably NaOH, KOH, or LiOH; the polyisocyanate is preferably a biuretized or isocyanurate-modified triisocyanate of a lower alkyl diisocyanate; and the polyamine is preferably added in a stoichiometric ratio relative to the isocyanate.

Abstract: A portable display system including an array of modular corrugated paperboard panels arranged in a matrix having at least two vertically adjacent rows of panels. Each panel has peripheral flaps folded back to provide strength and to capture threaded fasteners that protrude from the rear of the panels. Attachment hinges engage the fasteners at the rear of the panels to align and join adjacent panels. A vertical reinforcing tube is attachable at each end of the display by passing through holes defined in flaps at the rear of the panels.

Abstract: Two embodiments of a process for producing concentrated suspensions of polyurea microcapsules especially suitable for manufacturing carbonless copy paper (CCP) are disclosed. Either embodiment can be a batch or continuous process. In the first embodiment, a liquid hydrophobic phase comprising a core material and polyisocyanate at least partially soluble therein is emulsified with an aqueous continuous phase including a polyhydroxylated colloidal stabilizer to form a suspension of microdroplets of the hydrophobic phase. A polyamine such as diethylenetriamine reactive with the polyisocyanate and a catalytic amount of an alkaline base are then added, initiating an interfacial polyaddition reaction at alkaline pH which forms the polyurea microcapsules. The alkaline base is preferably NaOH, KOH, or LiOH; the polyisocyanate is preferably a biuretized or isocyanurate-modified triisocyanate of a lower alkyl diisocyanate; and the polyamine is preferably added in a stoichiometric ratio relative to the isocyanate.

Abstract: A multiple ply tubular core having continuous vapor barrier layers near the inner and outer surfaces of the tube. The vapor barrier layers have overlying and underlying layers comprising fibrous cellulosic material. The tube is stable to dimensional changes caused by absorption or loss of moisture to the atmosphere.

Abstract: A method for removing color from the caustic effluent produced during kraft pulping and bleaching is characterized by heating the caustic effluent to a temperature and under a pressure sufficient to cause an alteration in the chemical structure of the lignin chromophores in the effluent. The cooked effluent is cooled and has its pressure reduce to near atmospheric pressure. An acid material, such as chlorine extract from the bleaching process, is added to the effluent to lower the pH of the effluent to between 2.6 and 3.8 to initiate flocculation of the altered chromophores of the effluent. During flocculation, the chromophores are continuously separated from the effluent in order to produce a relatively clean and color-free liquid which may be deposited in the sewer system of the pulp mill.

Abstract: An electrically conductive medium or high density lignocellulose particle board useful in the manufacture of flooring, wall paneling, and furniture functioning to establish static-free environments for the manufacture and operation of microcomputers and related equipment and protection from static electrical discharge problems generally. The particle boards comprise dry-formed, hot-consolidated mixtures of______________________________________ finely divided, electrically conductive carbon particles 0.2-5 particle board adhesive 1.5-15 lignocellulosic particles balance ______________________________________In this composition the carbon particles are characterized by having specific surface areas of at least 20 square meters per gram. The lignocellulose particles comprise lignocellulose chips and flakes having width to length ratios within the range of from 1--1 to 1-20, and lignocellulose strands having width to length ratios within the range of from 1--1 to 1-40 and minimum widths of one millimeter.

Abstract: A method and apparatus for producing uniform pulp yields, wherein at least a refiner is controlled in accordance with the UV absorbance of the lignin dissolved in the digester cooking liquor, thereby to produce for a given quantity of wood chips a uniform pulp yield. A backflow control valve is automatically adjusted to maintain uniform flow of a sample of the digester cooking liquor through a UV analyzer, and a flushing arrangement is provided for flushing out contaminates such as sulphur dioxide from the system. Preferably the refiner is of the two-stage type, the first stage being automatically adjusted as a function of the UV absorbance of the digester cooking liquor, and the second stage being automatically adjusted as a function of the freeness of the output fiber slurry. Also, one or more of the cooking parameters is controlled by the UV analyzer to control the fiber yield.

Abstract: A method for removing color from the caustic effluent produced during kraft pulping and bleaching is characterized by heating the caustic effluent to a temperature and under a pressure sufficient to cause an alteration in the chemical structure of the lignin chromophores in the effluent. The cooked effluent is cooled and has its pressure reduced to near atmospheric pressure. An acid material, such as chlorine extract from the bleaching process, is added to the effluent to lower the pH of the effluent to between 2.6 and 3.8 to initiate flocculation of the altered chromophores of the effluent. During flocculation, the chromophores are continuously separated from the effluent in order to produce a relatively clean and color-free liquid which may be deposited in the sewer system of the pulp mill.

Abstract: A self-locking corner structure for trays, cartons, lids, or the like has a generally plainer main panel and first and second side panels foldable along fold lines relative to the main panel to positions normal to each other and to the main panel to form a corner structure. One of the side panels has a flap portion at one end thereof foldable along a fold line to a position parallel and with one of its side surfaces adjacent to the other side panel, the flap portion having a sloping edge. The other of the side panels has a tab portion foldable along a sloping fold line generally parallel and adjacent to said sloping edge with the side panels positioned normal to the main panel and normal to each other and with the flap folded to a position parallel to the other side panel.

Abstract: A corrugated paperboard corner post as utilized for packaging in a shipping container is formed by folding over a portion of corrugated, the upper and lower portions of the corrugated being divided into three panels each by slit score lines extending the length of the corner post, and gluing the outer panels of the upper and lower portions together. The corner post is initially formed in a flattened configuration to facilitate its shipment and handling in bulk and may be quickly and easily re-configured into its operable orientation by pushing both edges together and causing the panels to fold about their score lines.

Abstract: A method and apparatus for measuring the curl in a vertically suspended sheet of paper is disclosed. A pair of spaced horizontal laser beams is directed through a pair of collimating lenses to produce laser beams having a given width. The collimated beams are directed against the upper and lower side edges of the sheet in a direction parallel with the planar face of the sheet. The shadow images cast from the interruption of the pair of beams by the upper and lower edges of the sheet are detected and compared, with the difference between the images corresponding with the diagonal curl of the paper sheet.

Abstract: An improved valve assembly is provided for dispensing liquid from bulk containers. The valve assembly includes a tubular housing defining a cylindrical chamber open at its ends. The housing is connected with an opening in the liner of the container to afford fluid communication between interior of the liner and the chamber. The valve assembly includes a valve shaft having end portions rotatably connected with the housing and a cylindrical body portion extending transversely across the chamber. The shaft body portion contains a slot extending between the end portions for receiving a generally circular butterfly valve disc. The disc has a maximum diameter corresponding with the diameter of the chamber and a minimum diameter corresponding with the length of the slot. An O-ring is connected with the outer edge of the disc. When the valve shaft is rotated to an open position, the disc is arranged longitudinally of the chamber to permit the flow of liquid from the container through the chamber.

Abstract: An assembly for connecting the wooden members of a truss is disclosed, characterized by the use of a combination of adhesive and a connecting plate. The connecting plate is formed of metal and includes a plurality of nail-like projections which extend from and normal to a planar portion of the plate. A layer of adhesive is applied to the extremities of all of the projections. The wooden members to be joined are arranged in a desired configuration and the adhesive-covered projections of the plate are driven into adjoining members. In addition to the nail-like bond between the plate and the truss members, an adhesive bond is formed between the metal projections and the wood. The resulting joint has increased resistance to tensile, shear, and rotational forces.

Abstract: A corrugated fibreboard container of tube-and-cap construction has two-walled plastic lining and a bottom side-wall discharge hose. A metal lid-mounting flange in the top end-cap receives a conventional drum lid with vent opening and bung opening threaded to receive a standard plug or a discharge pump fitting to facilitate pumping from the top. A band of reinforcing panels of hardboard mounted on corrugated fibreboard is strapped to the container tube wall and the whole assembly is strapped to a wood pallet for ease of transportation and handling.

Abstract: An improved membrane-type end closure member for composite containers or the like is disclosed, characterized in that the end closure member is deformed to define an annular deformation of generally V-shaped or flat bottom transverse cross-section, which deformation extends partially within the end of the container when the end closure member is bonded to the open upper end of the container body. The annular deformation, which is arranged between the annular flange portion that is bonded to the end extremity of the container and a central circular disk portion of the end closure member, serves to reinforce the relatively thin flexible membrane member and flexes or "domes" in response to variations in internal pressure of the container to maintain the container in a closed condition.

Abstract: A support pad formed from a pair of corresponding horizontal vertically spaced rectangular blanks each divided by a pair of parallel fold lines into a center panel and a pair of side wall panels. In one embodiment, the blanks are joined by a pair of spacer members adhesively bonded between corresponding side wall panels of the blanks. The center panel of one blank contains a line of severance parallel with the fold lines, and cut out portions on opposite sides of the line of severance that define sets of corresponding dovetail projections and grooves.

Abstract: A pocket ventilation roll baffle assembly adapted for use in drying a paper web is disclosed. The pocket ventilation roll includes a stationary tubular inner core roll, a tubular outer shell roll mounted for rotation in concentrically spaced relation about the inner core roll, and a device for supplying drying air within the inner core roll. The drying air flows longitudinally through the inner core roll and radially outwardly through an arcuate portion of longitudinally arranged perforations contained in the inner core roll and circumferential perforations contained in the outer shell roll. The pocket ventilation roll baffle assembly includes a baffle arrangement for adjusting the profile of the drying air flowing radially outwardly from the pocket ventilation roll.

Abstract: Improved spin-bonding apparatus is disclosed for connecting a synthetic plastic end closure member to a composite container body wall, including an axially displaceable spinner member that is operable to an axially extended position in which it is rotated relative to the stationary mandrel by the rotatably driven spindle when the mandrel and spindle are in an initial axially spaced condition. The spinner member continuously supports the inner periphery of the sealing fin as the mandrel and spindle are displaced axially together toward their adjacent spin-bonding condition, whereby the sealing fin is protectively supported prior to positive spin bonding thereof to the synthetic plastic inner liner of the container body wall. The stationary mandrel is provided at its free end with a unitary sizing portion having a closely toleranced cylindrical surface for causing the free extremity of the container body wall to have a circular configuration.

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 composite container for fluent materials in the liquid or semi-frozen state is disclosed, together with a method for making the same. The container includes a vertically arranged body member that is flared at its upper end, and an end closure member is provided including a circular central panel portion arranged within and extending across the upper end of the body member, annular chuck wall portion extending upwardly from the central panel portion adjacent the flared portion of the body member, and an annular connecting flange portion extending radially outwardly from the upper end of the chuck wall portion. The invention is characterized in that the connecting flange and chuck wall portions cooperate with the flared portion of the body member to define an annular space in which is arranged a resilient annular mass of sealing material.