Abstract: A dryer fabric for use in a dryer section of a paper machine wherein at least a portion of the machine direction components are monofilaments made from polyphenylene sulphide or a blend of polyphenylene sulphide and heat-stabilized polyamide 66. When using a blend the polyamide 66 is present in the range of up to about 20% by weight.

Abstract: The invention relates to a woven all-synthetic monofilament dryer fabric for use in a paper-making machine. The fabric is constituted by a belt woven with warp and weft strands with the warp strands extending in the machine direction. The belt is interconnected at opposed ends by a woven single pintle pin seam to form an endless belt. The warp strands in at least rewoven end portions of the belt are flattened strands.

Abstract: This invention relates to a method of dissipating the static charge that is built up by a dryer fabric opeating in the dryer section of a paper making machine, thereby preventing adhesion of the paper to the fabric when it is transferred from one fabric to another. More particularly the invention relates to the addition of an anti-static agent to the coating material which is applied to the dryer fabric. The invention also relates to a dryer fabric coated with a coating material which includes 0.2 to 10% by weight of an anti-static agent.

Abstract: A heat set paper machine fabric having at least a portion of its wear resisting surface composed of cross-linked high density high molecular weight polyethylene.

Abstract: Relatively small easily exchangeable wear resistant inserts are mounted in a plurality of lengthwise grooves in a forming board or foil blade of a paper making machine so that a portion of each insert protrudes above the surface of the blade to form cross-machine direction channels on the blade. The channels promote agitation of the pulp stock on the forming fabric as it passes in contact with the blade.

Abstract: An automatic adjustable vacuum bleed valve particularly, but not exclusively, for use with a suction box of a paper making machine. The valve defines a first chamber connected to the suction box. A second chamber extends within the body of the valve and is connectible to a vacuum source. A hollow cylindrical valve stem passes through the second chamber and has a stem valve secured thereto to seat in the port in a wall of the second chamber. A further valve is positioned concentrically with the valve stem and seats in an opening provided in the body. The further valve has a stem slidingly engaged in a lower end of the valve stem. An upper end of the cylindrical valve stem is flexibly connected to the valve body by an impervious diaphragm having opposed surfaces, one of which is exposed to atmosphere and the other exposed to the first chamber. The control flow of fluid, such as water, is introduced in the cylindrical valve stem.

Abstract: A single ply forming fabric for use on a twin wire paper making machine wherein a flat jet stream of pulp is injected between an inner, conveying fabric and an outer, backing fabric converging towards each other for applying opposed pressure to the pulp for removing water therefrom to form a sheet of pulp. The single ply forming fabric of the present invention constitutes the outer, backing fabric and is interwoven with a plurality of monofilament polymeric warp strands with approximately 100% warp fill and monofilament polymeric weft strands extending in the cross-machine direction and disposed in vertically aligned groups of at least three to obtain greater stiffness in the cross-machine direction whereby to substantially redistribute pulp widthwise of the sheet when supported on the conveying fabric.

Abstract: A low permeability dryer fabric woven from monofilament plastic polymeric warp strands and weft strands in which at least some of the weft strands exhibit preferential softening under the influence of heat, said strands adapting to conform to mesh interstices and thereby restrict the passage of air through the fabric.

Abstract: A paper forming fabric having two layers of synthetic weft strands with interwoven synthetic warp strands and approximately 100% warp fill. The upper layer of the fabric comprises a regular array of mesh openings in which the distance between consecutive openings measured in the weft direction is never greater than the thickness of a single warp strand and measured in the warp direction is never greater than the thickness of a single weft strand.

Abstract: An improved dryer fabric, woven entirely from monofilament plastic polymeric warp and weft strands, having a lower permeability to air flow and lower modulus of elasticity than normal fabrics, wherein at least the warp strands are flattened in cross-section, with the long axis of the flattened section extending parallel to the plane of the fabric and wherein the weft strands may be shaped so as to more or less conform to the horizontally directed passages of the mesh naturally formed by the woven warp strands and may also be relatively more malleable than the warp strands so that under stress they can adapt to conform to the shape of mesh interstices thereby to restrict these and still further reduce the permeability.

Abstract: A shear roll is situated above an upper surface of a top run of a Fourdrinier fabric such that a lower portion of the shear roll is adapted to penetrate a pulp stock web situated on the Fourdrinier fabric. The shear roll is operated by an external source of power, the source of power adapted to drive the shear roll at a surface speed exceeding a linear speed of the fabric by greater than 3% and less than 8% of the speed of the fabric. The shear roll is situated at a location where a consistency of the pulp stock web considered on a fibre basis situated on the fabric is between 2% and 5 1/2%; and the shear roll adapted to provide a shearing action to fibre bundles and flocs situated in the pulp stock web as the pulp stock web passes between the shear roll and the fabric, there re-working the pulp stock web and re-forming the fibre network and smearing the flocs thereof.

Abstract: The paper-making stock on a paper machine is improved by running the forming fabric, carrying the stock, as a layer of a dilute aqueous dispersion of fibers, over a modified low-vacuum suction box having a slotted cover made up of elongated blades dividing the suction area into a grid. The surfaces of some of the blades support the fabric and the surfaces of others are lowered a small amount to allow the fabric to undulate and agitate the stock without substantially changing the grid area of the drainage surface. The lower level surfaces form a fluid seal with the undersurface of the fabric.

Abstract: A woven fabric and a method of forming a seam therein comprising a woven fabric as used for supporting a paper web on a paper making machine. The fabric has interwoven weft and warp strands with the strands in the machine direction being flexible strands incapable of retaining a stable crimp. The improvement in the fabric comprises a plurality of spaced apart replacement monofilament strands having stable crimp characteristics extending in the machine direction and in a seam area for interconnecting opposed ends of the fabric to form an endless belt having a seam which is substantially flat. The replacement strands have crimps of the same configuration as crimps in the machine direction strands of the fabric.

Abstract: An automatic adjustable bleed valve having an angularly displaceable valve body provided with an inlet opening and an outlet opening. A passageway interconnects a lower inlet and upper outlet openings. A gravity actuated displaceable valve element is mounted for guided movement in the passageway. A valve element seat is provided internally of the valve body about the inlet opening for receiving the valve element in close seated contact thereon. A stop element is provided internally of the body adjacent the outlet opening to limit the displacement of the valve element while permitting fluid passage from the inlet opening to the outlet opening about the valve element. A locking element is provided to hold the valve body in the desired angular position of adjustment.

Abstract: The invention is to shake the upper run of a Fourdrinier forming fabric of a paper machine by imparting vibratory motion, in a direction transverse to the machine direction, to light-weight foil blades mounted at the dilute end of the Fourdrinier section. The foils, which are in contact with the fabric, cause the upper run to vibrate in the same transverse direction, thereby shaking the stock and improving paper formation. It is preferred to vibrate the foils at a frequency close to the resonant natural frequency of the upper run of a fabric or a harmonic thereof. All or part of the top surface of some of the foils, which contact the upper run of the forming fabric, may be coated with a material having a relatively high coefficient of friction to increase the frictional contact between the upper surface of the foil and the forming fabric.

Abstract: A method and a system for preventing the accumulation of polarized foreign particles on a support surface of support elements positioned in contact with a moving fabric in a paper making machine. An electrically conductive fabric support surface of a support element is charged with an electrical charge of like polarity to the polarized foreign particles whereby the polarized foreign particles will be repelled from the support surface.

Abstract: The respective ends of a heavy fabric, for example, a woven dryer fabric or felt each provided with an array of connectong loops are joined with the help of a gap closing device. The gap closing device is detachably attached to the fabric when the latter is supplied to the user. When the fabric is being installed on the machine, the ends are pulled together by the gap closing device so that the arrays of loops are held in proximity and easily intermeshed to form an elongated tubular passage. A pintle wire is inserted into the passage to complete the joint. The gap closing device is then removed. A preferred gap closing device is a slide fastener, of which one tape is detachably attached to each end of the heavy fabric.

Abstract: This invention relates to a method and apparatus for guiding endless woven fabric belts such as are used on paper making machines. Specifically, the instant application teaches the use of a guide shower, which is disposed across the width of the endless belt, to provide the guiding action. The shower comprises a series of nozzles which are adapted to be directed at one edge or the other of the endless belt. Three separate embodiments are disclosed. In one of the embodiments, the shower pipe connecting the nozzles is divided into a left side and a right side. The nozzles on the left side are all directed at the left edge of the endless belt whereas the nozzles on the right side are directed at the right edge of the endless belt. In a second embodiment, two parallel shower pipes are disclosed, the nozzles of one of the shower pipes all being directed at the left edge of the endless belt, the nozzles of the other pipe all being directed at the right edge of the endless belt.