Abstract: At least two flexible belts each having a pair of longitudinal edges are fed parallel to each other to a uniting station with one edge of one unfinished belt transversely confronting one edge of the other unfinished belt. The two unfinished belts are laterally separated at the station so that their one edges are spaced from and parallel to each other and a separator belt is inserted into a space defined between the one edges. Then the two unfinished belts and the separator belt are fed together into a press, and are there hot pressed.

Abstract: Two decor laminate boards are produced in a single-level platen press in each operation by forming a stack of the two laminates and a separating layer between them. The layer leaves at least portions of an edge region of the stack free so that the two boards as they are formed in the press are bonded together and can be removed from the press without relative shifting. The joined region is then trimmed off to free the boards from one another.

Abstract: A spreading unit which may be used for the spreading of particles for the production of thin pressed board or as a cover layer or face layer for a multilayer pressed board in conjunction with other spreading units along a belt upon which a mat of the mixture of particles and glue is to be formed. The spreading unit has a bunker and a discharge system for discharging a raw material stream in free-fall which is intercepted by an air classifier spreading the particles onto the belt in parabolic paths. In a region directly below the raw-material discharge and over a portion of the parabolic paths, a ball-collecting unit, for example a disk grate, is provided to intercept the balls while allowing the particles to pass without altering their classification. Fine particles of the parabolic paths beyond the ball catcher pass directly onto the belt.

Abstract: A press for the production of pressed board with injection of steam utilizes press platens to which the steam is fed to the steam-feed channels from opposite sides in a collision flow, the channels communicating with steam-nozzle bores opening at the pressing surface and such that the cross section of each channel is equal to at least 60% of the total flow cross sections of the boards communicating with that channel. Before the pressing commences, the channels are through-flushed with steam to flush air from the channels and bores and to evacuate air from the pressed mat by a venturi effect.

Abstract: A belt press has horizontally extending and vertically spaced upper and lower plates defining a horizontally extending gap, vertically spaced upper and lower upstream drums rotatable about respective horizontal drum rotation axes at the upstream press end, and vertically spaced upper and lower downstream drums rotatable about respective horizontal drum rotation axes at the downstream press end. Each of the downstream drums is supported for at least limited pivoting about a vertical axis generally intersecting the respective drum rotation axis. Upper and lower endless belts spanned over the respective upper and lower drums each have a working stretch lying between the plates and a return stretch.

Abstract: A dewatering press for a mat of solid material, particularly for dewatering of fiber panels, includes upstream and downstream spaced apart stationary uprights, a press having a lower part and an upper part pressing against the mat of solid material in a pressing position of the press and a plurality of rollers mounted on the stationary uprights and guiding respectively a grate belt and lower and upper sealing belts between the uprights.

Abstract: A press for the production of pressed board with injection of steam utilizes press platens to which the steam is fed to the steam-feed channels from opposite sides in a collision flow, the chanels communicating with steam-nozzle bores opening at the pressing surface and such that the cross section of each channel is equal to at least 60% of the total flow cross sections of the boards communicating with that channel. Before the pressing commences, the channels are through-flushed with steam to flush air from the channels and bores and to evacuate air from the pressed mat by a venturi effect.

Abstract: A sludge volume of difficult to dewater sludge is subdivided in a sludge dewatering press into fractional volumes which are self-draining even at press pressures of 50 bar and more. The partitions are water-permeable and form water channels for conducting the expressed liquid away from the sludge volume.

Abstract: Paper or cellulose pieces forming a fiber raw material are wetted with water prior to comminution so that the comminution into fibers is effected with the moistened raw material. The moisture content of the fibers makes up at least part of the water of hydration required to completely set the binder which is mixed with the fibers. The binder can be plaster (gypsum) or hydraulic cement. The mixture is pressed to the desired shape and heat may be applied.

Abstract: A fiber or chip board is made by first forming a mixture of a binder and particles having a relatively low moisture content that is substantially less than a relatively high moisture content that a finished board should have. This mixture is deposited as a mat on a movable substrate so that the mat is substantially at ambient temperature and has the relatively low moisture content. Then the mat is preheated with steam to raise its temperature and to increase its moisture content to the predetermined relatively high moisture content. The thus preheated mat, whose moisture content has been corrected, is then simultaneously heated and compressed to form it into a board.

Abstract: An apparatus for forming a particle mat for the production of particleboard has a transport belt having a stretch moving in a longitudinal transport direction and forming a deposition surface in turn defining a floor of a deposition space, a dispenser upwardly delimiting the space and including a dispensing roller for depositing particles as a mat in the space on the longitudinal moving deposition surface, a pair of transversely spaced and longitudinally extending upper guides extending in the space generally at the dispenser, and a pair of transversely spaced and longitudinally extending lower guides extending in the space underneath the respective upper guides and generally at the deposition surface. A pair of longitudinally extending, continuous, and transversely spaced flexible sheets each extend the full longitudinal length of the deposition space and have an inner edge secured to one of the guides of a respective one of the pairs of guides and an outer edge.

Abstract: To avoid distortion of metal strips flanking the glass fiber resin layers in a system for fabricating circuit board structures in a continuous press, the metal foil webs are bonded to glass fiber webs before the layers are introduced into the mouth of the continuous press and only in the mouth do composite layers meet additional glass fiber and resin layers.

Abstract: The continuous press for hot pressing a mat as a step in making chipboard, fiberboard, laminated board and similar composite materials comprises heated platens, upper and lower pressing plates and press belts which are guided on roll rods in a pressing region which run between the heated platens and the press belts. The roll rods are guided over a guideway around the upper and/or lower pressing plate with the help of an upper and a lower roll rod circulating mechanism which has guide chains and a roll rod feed mechanism with entrance-end roll rod feed wheels. Roll shoes are located at the entrance end in the vicinity of the guide drums for the pressing belts and the roll rod feed mechanisms. The associated press belts are guided with the roll shoes. The roll shoes also have auxiliary rolls which are guided over another guideway and which are guided on the press belt side over shape-determining guide surfaces.

Abstract: The loading apparatus for a platen press with at least one press stage used in making particleboard, especially chipboard and/or fiberboard, from a mat comprises a loading frame which has at least one loading stage and a belt tray insertable into the panel press in the loading stage and removable therefrom. The belt tray comprises a drive drum shaft with a drive drum mounted rigidly thereon, a delivery lip and a belt guided endlessly over the drive drum and the delivery lip. The conveyor when the belt tray returns from the press for delivery of the mat is driven by a rack fixed to the frame and an associated pinion on the drive drum shaft. The pinion is mounted losely on the drive drum shaft and is nonrotatably connected with one half of a clutch whose other half is nonrotatably connected with the drive drum shaft.

Abstract: Process for making a press platen heatable by a fluid medium whereby in a steel plate a plurality of heating channels running parallel to each other are drilled in one direction and the heating channels are connected according to a predetermined flow pattern for the fluid medium to collecting channels and return channels running transversely with respect to the heating channels. First, the return or collecting channels are drilled. In the return or collecting channels, cores with a predetermined fit are inserted. After that, the heating channels are drilled and thereby the cores inserted in the return or collecting channels are drilled through. Subsequently, the drilled cores are extracted and outside the steel plate the cores of the return channels are provided with deflectingly shaped elements and optionally with plugs. Finally, the cores equipped with the deflecting elements, as well as optionally with plugs, are inserted again in the assigned return channels.

Abstract: The apparatus for hot pressing a pressed board mat used in making chipboard panels, fiberboard panels and pressed board panels comprises a continuously operating press with a lower press belt and an upper press belt and a conveyor with at least two endless conveyor belts adjoining each other. The press has a mouth entrance in which the conveyor extends with a delivery nose directed in the feed direction up to a delivery region in the entrance. The delivery nose is movable in the vertical direction, in the transport direction and in a direction opposite to the transport direction and because of that, the delivery region is displaceable in the entrance of the press according to the thickness of the pressed board mat to be pressed.

Abstract: A hydraulic-control system for a hydraulic press utilizes a main power unit consisting of a pump and a flywheel which delivers the energy necessary for a working stroke to at least one cylinder of the press. An auxiliary power unit consisting of an electric motor and another pump driven thereby is connected to the hydraulic network to drive the first mentioned pump as a motor and rotate the flywheel to increase the energy stored therein.

Abstract: A press has a flywheel and a spindle both rotatable about an axis, an axially displaceable ram and nut threadedly engaging the spindle so that rotation of the spindle axially displaces the ram, and a clutch between the flywheel and the spindle. The clutch has a housing formed with a radially open service port, a clutch plate rotationally fixed to the flywheel, and another clutch plate rotationally fixed to the spindle. One of the plates is formed with axially open cavities and one of the plates is axially movable through a relatively long stroke between an outer position with the plates spaced apart and an inner position with the plates close together. High-friction coupling elements of a predetermined axial height shorter by a working distance than the long plate stroke are seated in the cavities. The movable clutch plate can be displaced through the long axial stroke so that the clutch plates engage axially and rotationally link the spindle and flywheel.

Abstract: A continuously operable press for the manufacture of laminates and similar products has a heated press roll, two guide rolls, and at least one tensioning roll. One end of the rolls is journaled in bearings at a fixed support wall and the other end of each roll is removably journaled in bearings of a movable support wall. A pressure belt is passing over the rolls, but a decorating roll sleeve can be slid on and of from the press roll, and this provides a decoration on the adjacent laminate surface. The press has a device for lifting the relaxed pressure belt so as to remove the decorating roll sleeve. The lifter device has at least two transverse lift bars with suction heads, and the lift bars are distributed about the upper circumferential region of the press roll. Compressed air can be introduced between the press roll and the decorating roll sleeve when taking the decorating roll sleeve from the press roll.

Abstract: Particulate mats are transported from the downstream end of an upstream conveyor normally moving continuously in a longitudinal transport direction at a predetermined relatively slow speed to a press downstream in the direction from the upstream conveyor that receives the mats and presses them into hard panels by supporting the mats between the upstream conveyor and the press on a downstream conveyor having an upstream end spaced downstream from the downstream end and a downstream end at the press and an intermediate conveyor extending between the upstream end of the downstream conveyor and the downstream end of the upstream conveyor and having a length in the direction at least equal to that of each of the mats in the direction. A carriage supporting the downstream end of the upstream conveyor, the intermediate conveyor, and the upstream end of the downstream conveyor is reciprocated in the direction at a frequency related to mat size and speed.