Abstract: In gypsum board faced with a fibrous mat, for example, a mat of glass filaments adhesively bound together, improvements are realized by the use of a reinforcing resinous binder in the mat.

Abstract: Apparatus for mixing granules of different colors for use in surfacing for example asphalt shingles in which the valve opening is controlled automatically, the valve being opened by a drive having a fixed valve opening travel and the different valve open positions being determined by intially presetting the valve opening drive by operating it a predetermined amount from a home position in the direction opposite from the valve opening direction, reversing the drive motor to return it to the home position while recording the motion as a part of the fixed valve opening motion, and reenergizing the drive to complete the valve opening motion. The apparatus is also adapted to be operated manually in the event of a malfunction or power failure and it is provided with diamond-shaped orifices whereby the valve opening is a function of the square of the percent of valve travel to provide more accurate control in the low valve opening ranges.

Abstract: A dispenser for rolls of flexible sheet material wound on cores is disclosed. The dispenser holds multiple rolls and includes guide tracks for guiding the rolls through the dispenser. A holding lever pivotably connected to each side of the dispenser selectively holds the rolls in position in the dispenser and has its pivoting motion controlled by a sensing plate which contacts a lower dispensing roll to sense when the sheet material is substantially depleted. The lower dispensing roll is always held out of contact with rolls of a dispensing mechanism, in one embodiment initially by a transfer roller and thereafter at a constant vertical axis by the holding levers and, in another embodiment by the holding levers alone. A shield is located between the roll surface of the lower dispensing roll and the rollers of the dispensing mechanism.

Abstract: A paperboard carton having a self-locking bottom for holding heavy produce and the like which may be made with minimum waste and cutout material. The minor or width flaps have an inwardly folding flap locking segment which, then folded, defines a generally rectangular opening centrally located along the outer edge of the minor flaps. The major or width flaps have a flap locking slit formed therein. An assembly flap hingedly formed in the major flap may be folded inwardly to create an assembly slot along a portion of the flap locking slit.

Abstract: An improved composition and process for preparing plaster molds used in casting nonferrous metals is provided wherein plaster molds are prepared from particulate calcium sulfate molding plaster admixed with insoluble calcium sulfate anhydrite whisker fibers.

Abstract: A method for treating the combined ink and starch wastes from a paper converting plant by adding a cationic polymer flocculation adjuvant to the wastewater to form a sludge and then treating the sludge with a cementitious material to yield a stabilized solid safe for disposal by landfill.

Abstract: A fire-resistant door comprises a core panel of mineral material, such as gypsum wallboard. A fiber mat, preferably comprising glass fibers, is at least partially embedded in each face of said core panel. An edge banding assembly disposed around the periphery of the core panel is centrally grooved to receive the panel edges. Facing sheets are affixed to the opposite sides of the edge banding assembly in spaced parallel relation to the core panel, and a spacer material at least partially fills the spaces between the facing sheets and the core panel.

Abstract: An exterior finishing system for a building. including particularly an exterior insulation system, which includes a fibrous mat-faced gypsum board, preferably a board in which the set gypsum core thereof is water resistant, and preferably one in which the set gypsum core is sandwiched between two sheets of porous glass mat, with the outer surface of at least one of said mats being substantially free of set gypsum, and means for preparing the board, including control of the viscosity of the aqueous gypsum slurry from which the set gypsum core of the board is formed. Also, the use of fibrous mat-faced gypsum board as the shaft liner panel in a shaft wall assembly.

Abstract: A coherent particulate composite is formed by blending particulate material with a binder containing lignosulfonate and urea.

Abstract: A fire door comprising a core and edge banding, the principal ingredients of the core being expanded perlite, gypsum and cement, the edge banding comprising a strip of natural wood, a strip of a cast mixture of which the principal ingredient is gypsum and an intervening strip of plastic laminate.

Abstract: A stop mechanism for a feed roller associated with a cutter in a dispenser for flexible rolled web material has a stop lever mounted to pivot in a plane normal to a feed roller rotational axis, such lever having a slot with lift and stop flanges disposed on opposite sides of the slot, respectively. A feed wheel rotatable with the feed roller has a control tab to successively engage with the lift and stop flanges so that as the feed roller rotates by web material being pulled from the dispenser, the control tab first lifts the stop lever by means of the lift flange and then abuttingly frictionally engages with the stop flange to retain the stop lever in its lifted position and stop feed roller rotation until the frictional engagement is relieved by pulling tension on the web being terminated whereupon the lever drops until the tab can pass over the upper end of the stop flange to free the feed roller for further rotation.

Abstract: A composition useful as the core of fire resistant gypsum board and comprising a major amount of set calcined gypsum and minor amounts of whisker fibers, glass fibers and clay.

Abstract: A dispenser for rolls of flexible sheet material has a feed roller with a pair of pinch rollers spaced around the feed roller periphery to guide a web of the material from a supply roll to the dispenser exit. A cutting blade is slidably mounted within the feed roller to move in a path parallel to and offset from a radius of the feed roller with cam followers movable with the blade and extending beyond the ends of the feed roller disposed to reciprocate along this radius. Stationary cams are mounted adjacent the ends of the feed roller engaged with the cam followers, respectively, to positively project the blade cutting edge beyond the feed roller periphery to cut the web and retract such edge as the feed roller is rotated by drawing on the web at the dispenser exit.

Abstract: A coherent particulate composite is formed by blending particulate material with a binder containing lignosulfonate and urea.

Abstract: A fire-resistant article, for example, a fire door core comprising a major amount of expanded perlite in compressed form, an adhesive material, the major portion of which is starch, and preferably glass fibers, and a method for making the article by dry-mixing the ingredients substantially completely before water is added for the purpose of developing the adhesive characteristics of the starch.

Abstract: A device for preventing napkins from bunching at the dispensing opening in a napkin dispenser. A pair of pressure relief rods are provided along the upper and lower portions of the dispenser face plate to relieve pressure between the face plate and the center portion of the napkin stack. Accordingly, the friction between each napkin is substantially reduced, thereby permitting individual napkins to be withdrawn from the dispenser without displacing napkins remaining in the stack.

Abstract: A dispenser and dispensing method for flexible web material that is wound into a roll on a readily deformable hollow core has a housing carrying opposed parallel guide tracks to guidingly receive roll core supports projecting from the roll ends and a spring biased lever pivoted on such housing, the lever applying an axial force to the hollow core at one roll end and being maintained in a roll retaining condition by the presence, in a roll dispensing position, of a hollow roll core that is held against downward displacement from such position. An axial force is applied against the other end of the hollow core.

Abstract: A process of making a deicing or dust control agent with reduced corrosivity comprises mixing spent sulfite liquor and chloride salt of an alkali metal or alkaline earth metal proportionally so that the ratio of lignosulfonate solids of the spent sulfite liquor to metal chloride salt is from about 1:25 to about 15:1 and the pH of the mixture is from about 4.5 to about 8.5. The sulfite liquor: chloride salt product can be spread onto road surfaces in dried form, sprayed on as single or multiple solutions, and/or mixed with a non-slipping agent or the like.

Abstract: A composition useful as the core of fire resistant gypsum board and comprising a major amount of set calcined gypsum and minor amounts of whisker fibers, glass fibers and clay.

Abstract: A carton for produce and the like has a bottom closure provided by pairs of major flaps and minor flaps hingedly connected to the carton body side walls and end walls, respectively. The major flaps have L-shaped slots cutout adjacent each end of the major flap, each slot providing a pair of generally perpendicular slot legs with one leg terminating adjacent the hinge line connecting the major flap to a side wall of the carton body and the other leg extending longitudinally of the major flap to provide a locking edge generally parallel to such hinge line with the edge terminating at an end abutment. Each minor flap has a fold line segregating an end portion of the minor flap and a cutout segment disposed centrally along the outer end of such end portion, this segment defining spaced locking corners at its opposite ends with projecting tabs on the end portion disposed laterally of the segment ends.