Abstract: A cutter for comminuting a moving continuous sheet or web, such as paper broke, in the dryer or converter section of a papermaking machine, includes a plurality of high pressure water jet cutting nozzles positioned in a conduit section for receiving such broke from the papermaking machine. In one embodiment the nozzles are arranged in banks positioned to impact the sheet as it passes through the conduit section, from opposite sides, and are mounted on water conduits which, in turn, are mounted for reciprocating movement and are oscillated transversely of the direction of sheet movement by a mechanical drive. The cutting jets from the high pressure nozzles impact the sheet simultaneously at opposite sides, while being reciprocated to reduce the sheet into a multiplicity of smaller discrete or easily separable pieces which fall through the bottom of the conduit section, for further processing or disposal.

Abstract: A motor vehicle rollover protection device is provided at each side of the vehicle and can be raised out of a lowered position in one plane into a supporting position and fixed in this supporting position. At least one of the rollover protection devices is arranged to extend approximately in the longitudinal direction of the vehicle and on each of the two sides of a vehicle body. In the lowered position, the device is sunk into a vehicle side wall.

Abstract: Screening apparatus for separately removing knots and heavy reject particles from paper making stock comprises a generally cylindrical vertical housing having the interior thereof separated by a cylindrical perforated screening member into an annular screening chamber and an accepts space on the outer and inner sides of the screening cylinder respectively. Separate outlets for light and heavy reject particles are located at the top and bottom of the screening chamber, the supply flow of feed stock enters the screening chamber at the bottom thereof, and special provision is made to insure that maximum separation of the knots and other lighter reject particles from the heavy reject materials will be effected within the screening chamber with minimum contact with the screening cylinder itself.

Abstract: A deflection controlled roll has a rotatable shell supported on a non-rotating central beam by a plurality of individual shoes which are positioned transversely of the beam between the beam and the shell. A curved semicylindrical surface of the shoe bears against an inside surface of the shell and is hydrodynamically lubricated by an oil film, in the nature of a plain bearing. The shoes are biased by inflatable air lift bellows which are positioned within recesses within the shoe, between the shoe and the beam. The shoes are mounted on the beam on pins which provide at least three degrees of freedom of movement. An improved drive for the roll shell has a cog belt sheave mounted on the shell in concentric relation to one of the shell support bearings. A cog-type drive belt is threaded on the sheave, and a drive pulley for the drive belt is positioned normal to the direction of shell deflection such that the deflections do not change the spacing between the pulley and the sheave.

Abstract: A method for thickening a liquid suspension of solid particles, such as papermaking pulp in water, uses a pair of spaced apart rolls and a woven wire or plastic wire belt trained around these rolls. The suspension is supplied at the first roll for centrifugal extraction and is carried by the belt to the second roll for further water extraction and thickening, and is then discharged from the apparatus. In one embodiment, the first roll is formed with an open surface, and the suspension is delivered to the web at least partially by flowing both into and out a roll chamber via the first roll openings, from a headbox in the on-running wedge zone.

Abstract: In a flat bed, Fourdrinier-type, countercurrent washer for pulp, the opportunities for the development of foam are minimized by "wet" operation of the washer so that the pulp mat remains essentially full of liquid as it passes from each washing zone to the next. Special provision is also made for compensating for drainage at too slow a rate in one washing zone by bypassing some of the flow of washing liquid to that zone so that it is delivered to the zone upstream therefrom. An additional feature is the provision of controls over the flow of drained liquid from one or more of the receptacles therefor so that any solid particles floating on the top of that liquid in the receptacle are delivered to the countercurrent flow which ultimately reaches the evaporator.

Abstract: Apparatus for screening papermaking stock comprises two annular flat screening plates arranged in parallel spaced relation to form a screening chamber therebetween which is bounded on its outer periphery by a cylindrical wall, and wherein a rotor includes vane portions which extend into this screening chamber to agitate the stock so that particles of sufficiently small size can pass through the screening plates into annular compartments outside the screening plates from which they flow into a peripheral chamber having an outlet port. The screening chamber includes an annular space which is surrounded by the accepts chamber and is radially beyond the vane portions of the rotor wherein reject material collects for discharge through an outlet tube which extends through the accepts chamber to the outside of the apparatus.

Abstract: In order to reduce the interior noise level in an automobile, the vibration excitation of the front region of the floor panel is reduced by means of localized gaps between front longitudinal members, on the one hand, and the floor panel, on the other hand, as well as through support of the longitudinal members by a cross member in an approximately middle region of the sill members only, whereas the vibration excitation of the rear region of the floor panel is increased, so that in the head region of the vehicle occupants airborne vibration components are present which in amplitudes as well as phases are suitable to extinguish one another by means of interference.

Abstract: Apparatus for thickening a suspension of pulp material employs a single pair of liquid-impervious rolls and a single loop of wire trained around both rolls which are spaced from each other in substantially the same horizontal plane. The pulp stock to be thickened is delivered into the wedge zone defined by the upper wire run approaching the top of one roll and the surface of that roll, so that the pulp is trapped between the wire and roll as it travels around the roll with the wire, and the rolls are driven at sufficient speed to develop centrifugal forces which cause liquid to be expressed through the wire from the pulp trapped against the roll.

Abstract: The present invention is directed to a stable dispersion of a polyurea and/or a polyhydrazodicarbonamide in a relatively high molecular weight hydroxyl-group containing material, which dispersion has a solids content of from 5 to 50 percent by weight and which is obtained by reacting(a) an organic di- and/or polyisocyanate with(b) an amine-functional material comprising an addition product of(1) acrylonitrile and(2) a member selected from the group consisting of(i) hydrazine,(ii) aliphatic di- or polyamines containing at least two primary amino groups,(iii) cycloaliphatic di- or polyamines containing at least two primary amino groups,(iv) araliphatic di- or polyamines containing at least two primary amino groups, and(v) mixtures thereof,the ratio of (1) to (2) being at least one mol of (1) per mol of (2) and at most one mol of (1) for each nitrogen atom contained in (2) per mol of (2),the reaction of component (a) and component (b) being conducted at a temperature of from 30.degree. to 170.degree. C.

Abstract: This invention relates to polyurethane foams capable of being welded by high frequency welding and a process for producing the same, characterized by the addition of certain ammonium salts of acids containing phosphorus to the starting components for the polyurethane foam in order that the polyurethane starting materials and the polyurethanes contain from 0.1 to 10%, by weight, of ammonium salts of phosphorus-containing acids. Phosphorus-containing ammonium salts which are available in the liquid form and completely soluble in polyols are particularly suitable with salts of phosphoric acid mono- and dibutyl esters, dialkyl phosphinic acids, alkyl phosphonic acids and alkyl phosphonic acid monomethyl esters being preferred. The addition of these acids significantly increases the dielectric loss factor of thermoplastic polyurethane foams and, therefore, also considerably increases their capacity for being welded by high frequency welding.

Abstract: The invention relates to solutions of(A) from 3 to 60% by weight, based on the combined ether-polyol content, of separately prepared oligo-urethane ethers containing terminal OH.sup.- groups in the form of reaction products of(a) diisocyanates with(b) dialcohols having an average molecular weight of from 200 to 800, the stoichiometric ratio of (a) to (b) amounting to various values based on the average molecular weight of the dialcohols,in(B) polyether polyols containing at least 2 hydroxyl groups and having an average molecular weight of from 1000 to 12,000 and to their use in a proess for the production of polyurethane foams capable of being effectively flame-laminated and (high-frequency) welded without any adverse effect upon their other properties.

Abstract: A screening cylinder for use in screening apparatus for paper making stock includes a reinforcing skeleton structure comprising multiple bars extending generally axially of the inside of the cylinder which are welded to relatively heavy reinforcing hoops located at both ends of the cylinder and at a plurality of uniformly spaced locations along the length of the cylinder. Between each adjacent pair of these hoops is a plurality of circular rings of metal rod material arranged in closely spaced relation with each other and with the hoops to define a corresponding plurality of circumferentially extending screening slots.

Abstract: The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, -OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.

Abstract: Apparatus for screening a suspension of liquid, paper making fibers and undesirable rejects to remove a substantial portion of the rejects therefrom comprise a cylindrical screening member provided with circumferentially extending screening slots in the range of from greater than 0.008 inch to approximately 0.030 inch in width, and bars projecting from the inlet face of the screen and cooperating with rotating foils for creating a field of high intensity, fine scale turbulence adjacent the inlet face of the screen. The paper making fibers and other particles of elongated thin shapes can pass through the screening slots, but relatively chunky reject particles, which would pass through the larger openings of conventional paper making screens, are rejected without fractionation of the paper making stock or appreciable variation in the consistencies of the feed, accepts and reject flows.

Abstract: A solution of a polyurethane in a polyol is made from (a) the reaction product of a polyisocyanate and a diprimary diol, and (b) a polyether in which the reaction product constitutes from 3 to 60 wt. % of the solution. Suitable diprimary diols have a molecular weight of from 90 to 800 and a structure at both hydroxyl groups corresponding to the general formula: ##STR1## in which R.sub.1 represents chlorine, an alkyl, cycloalkyl, aralkyl or aryl radical having from 1 to 10 carbon atoms, which carbon atoms may be substituted or interrupted by chlorine, ester groups, ether groups, amide groups, urethane groups or nitrile groups, andR.sub.2 represents hydrogen or a radical within the definition of R.sub.1.Polyethers which may be employed have at least two hydroxyl groups (at least 80% of which are secondary hydroxyl groups) and an average molecular weight of from 500 to 12,000.

Abstract: The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting:(a) polyisocyanate,(b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and(c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: ##STR1## wherein m represents an integer of from 1 to 3,n represents an integer of from 0 to 8,X represents halogen, hydrogen, C.sub.1 to C.sub.6 alkyl, --OR, or ##STR2## R represents C.sub.1 to C.sub.6 alkyl, R.sub.1 represents hydrogen, C.sub.1 to C.sub.10 alkyl, C.sub.1 to C.sub.10 alkylene, C.sub.6 to C.sub.10 aryl or C.sub.6 to C.sub.10 arylene, andR.sub.2 and R.sub.3, which may be the same or different, represent C.sub.1 to C.sub.10 alkyl in the presence of water and/or blowing agent.The present invention also relates to dialkoxy-phosphonyl-N-formic acid amides.

Abstract: A pressurized screening device has an inlet arrangement by which a feed slurry is directed to a central portion of a screening chamber, a plurality of chevron-shaped rotor foils are mounted for rotation near the inner surface of a cylindrical screenplate to split the flow of the feed slurry into separate flow portions directed toward opposite ends of the screening chamber, and separate reject chambers are provided adjacent its opposite ends of its screening chamber. The chevron-shaped foil structure enables the screening device to operate as if it were two smaller screening devices and to remove efficiently both light and heavy impurities from the feed stock.

Abstract: Novel, finely divided, redispersible dispersions of high melting polyesters in low melting polyhydroxyl compounds are disclosed. Disclosed also is a process for their preparation and their use as polyol components containing fillers in the production of cellular or non-cellular polyurethanes.

Abstract: The instant invention is directed to a process for the production of elastic polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting(a) polyisocyanates with(b) polyethers having a molecular weight of from 400 to 10,000 and having at least two hydroxyl groups and(c) hydroxy-pivalic acid neopentylglycol ester of the formula: ##STR1## used in a quantity of from 1 to 20% by weight, based on the hydroxyl polyether, in the presence of a blowing agent.The instant invention is also directed to the polyurethane foams prepared thereby.