Plastic article or earthenware shaping or treating: apparatus – Press forming means – press reshaping means – or vulcanizing...
Patent
1996-10-08
1998-01-27
Nguyen, Khanh P.
Plastic article or earthenware shaping or treating: apparatus
Press forming means, press reshaping means, or vulcanizing...
425373, 425394, 425404, 264 83, B29C 4324, B29C 4346
Patent
active
057119724
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a dry method for the continuous manufacture of board. More particularly, the present invention relates to such a method using as starting material lignocellulosic material such as wood, straw, bagasse and the like. Still more particularly, the present invention relates to a device for compressing and processing a mat of lignocellulosic material during the manufacture of board material.
BACKGROUND OF THE INVENTION
The manufacture of board material using the dry method comprises the steps of disintegrating the raw material to particles and/or fibers of a suitable size, drying them to a definite moisture content, glueing the material prior or subsequent to the drying step, forming the glued material into a mat, and compressing and hot pressing the mat into the form of a complete board.
The continuous compressing and pressing of the mat of lignocellulose-containing material into a board can be affected positively by injecting a suitable processing medium, in the form of a gas or liquid, whereby the properties of the complete board can also be improved. An example of such a processing medium is a vapor, which heats and moistens the fibers in the material and thereby facilitates the pressing operation and/or accelerates the hardening process. Other possibilities are the injection of a hardening agent or an accelerating agent into the already pre-glued mat.
In order to facilitate the injection of a vapor or another gas into the material mats, an injection box is normally used, against which the mat or a wire support for the mat slides. The box is provided with a large number of injection holes or slots and an edge which seals to the mat/wire. The box can be formed, for example, as a tubular package, or in some other way. All of the various configurations of the box have one feature in common--i.e., they must be constructed so as to permit the mat/wire to slide against the box.
In certain cases an injection box is located on one side of the mat, and a suction box on the opposite side, directly in front or offset therefrom. The injection and suction boxers are usually given a similar shape.
The sliding which takes place between the mat/wire and the injection and suction boxes, respectively, gives rise to considerable wear, which implies that at least the sliding surfaces must be exchanged. Furthermore, the sliding between the mat/wire and the boxes often causes problems with the edge sealing.
SUMMARY OF THE INVENTION
These and other objects have now been realized by the invention of an apparatus for compressing a mat of lignocellulose-containing material during the manufacture of board material therefrom which comprises at least one rotary compression roll including a circumferential surface and first and second end walls, the at least one rotary compression role including a perforated shell forming that circumferential surface, a plurality of axially oriented ducts disposed within the rotary compression roll adjacent to the surface, and a shoe disposed adjacent to the first end wall of the rotary compression roll, the shoe including a channel for injection a processing medium into at least one of the plurality of axially oriented ducts whereby the processing medium is directed onto the mat in a processing section during compression of the mat by the rotary compression roll. In a preferred embodiment, the shoe is slidable along the first end wall whereby the location of the processing section can be altered.
In accordance with one embodiment of the apparatus of the present invention, the shoe has a length corresponding to a minor portion of the circumference of the rotary compression roll.
In accordance with another embodiment of the apparatus of the present invention, the apparatus includes a plurality of support strips carrying the perforated shell and defining the plurality of axially oriented ducts.
In accordance with another embodiment of the apparatus of the present invention, the channel comprises a first channel, and the shoe includes at least o
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patent: 5433905 (1995-07-01), Tisch
patent: 5658407 (1997-08-01), Thorbjornsson
Dialog Information Services, File 240, Paperchem, Dialog accession no. 461009, Paperchem No. 60-01009, Darchiashvili V.V. et al: "Apparatus for Impregnating Wood fiber Mats," USSR Pat. 1,426,794, issued Sep. 30, 1988; filed: USSR appln. 4,273,778/29-15 (Apr. 13, 1987).
Nilsson Fredrik
Pihlstrom Vincent
Schedin Kurt
Nguyen Khanh P.
Sunds Defibrator Industries AB
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