G. Siempelkamp Gmbh & Co.

Karl Walter

Werner Gawlitta

Stephan Schulz

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.

Press for producing pressed board by treating the material with steam

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.

Method of operating a press for producing pressed board

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.

Apparatus for hot pressing mats used in the manufacture of chipboard,

A process for making a composite wood panel, fiberboard or the like comprises putting a mat to be pressed between the press platens of a press, compressing the mat with heated press platens in a first compression step without feeding in steam until a density of at least 50% of that of the product panel is reached, preferably 70 to 85%, in a second compression step feeding steam with a pressure of between 1 to 3 bar through both press platens and compressing further until from 10 to 40% of the compression occuring in the first compression step (this is taken as 100%) is attained, in a third compression step interrupting the steam feed, the density attained in the second step being maintained, and subsequently compressing with a pressure of steam which is greater than the steam pressure used in the second compression step. Advantageously the steam pressing step is characterized by a flushing event in which the steam issues from the steam pressing orifices of one of the press platens and flows through the mat and also into the steam orifices of the other one of the press platens which temporarily are cut off from the source of the steam. Furthermore during a final compression time interval the mat is exposed to the action of a vacuum source connected to at least one of the press platens to dry the mat.

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Kempen, Germany

Karl Walter