US3762974A - Method for the manufacture of compressed boards - Google Patents

Method for the manufacture of compressed boards Download PDF

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Publication number
US3762974A
US3762974A US00189223A US3762974DA US3762974A US 3762974 A US3762974 A US 3762974A US 00189223 A US00189223 A US 00189223A US 3762974D A US3762974D A US 3762974DA US 3762974 A US3762974 A US 3762974A
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United States
Prior art keywords
layers
particles
support layers
boards
preforms
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00189223A
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English (en)
Inventor
W Wirz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAHRNI P INST Ltd
FAHRNI P INSTITUTE LTD CH
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FAHRNI P INST Ltd
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Application filed by FAHRNI P INST Ltd filed Critical FAHRNI P INST Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats

Definitions

  • ABSTRACT The object of the present invention is a method of producing compressed boards by the hot pressing of board preforms from particles treated with a thermosetting binder.
  • the field of use is primarily for the manufacture of wood chip boards,but other fields are also important.
  • the object of the present invention is a method of producing compressed boards by the hot pressing of board preforms from particles treated with a thermosetting binder.
  • the field of use is primarily for the manufacture of wood chip boards, but other fields are also mold line, whereby a lot of space is taken up and the plant is made complicated in development and opera tion. Furthermore, the sheets become worn. Their thickness must therefore be checked periodically and they must be replaced from time to time. Finally, the change in the thickness of sheet by wear must be taken into consideration upon the pressing
  • this goal is achieved in the manner that first of all webs which are thin with respect to the thickness of the board preforms are formed from particles, whereupon said webs are compacted by hot-pressing to such an extent that the binder is at least partially set, and that thereupon the individual board preforms are formed by strewing the particles onto these thin sup porting layers which have been precompacted in this manner and the boards are produced by hot-pressing and combination of supporting layers and board preforms.
  • the method also leads to further advantages. Aside from the simplification of the forming line and the gen tle treatment of the preforms while they are still loose, it has been found that, for instance, the wear of the conveyor belts is also less since it is no longer necessary to use guide rollers of very small diameter. Furthermore, the tolerances as to thickness are now only de pendent on the press-plates. It is also favorable that hardening of the binder of the lowermost layer of the preforms, due to the contact heat of the hot compressed boards, can, for all practical purposes, no longer take place.
  • the support layers which have been very rapidly hot-pressed in a previous stage of the process insulate the board preforms to a certain extent against the transfer of heat until the press is substantially closed.
  • the present invention also relates to an apparatus for the carrying out of the new method.
  • This apparatus is characterized by a strewing device for the formation of thin webs of particles intended for a surface region of the boards, a hot press for compacting said webs to form thin support layers, further means for the strewing of the actual board preforms and a heated main press for the final pressing of the preforms and the combining thereof with the hot pre-pressed support layers.
  • FIG. 1 is a schematic side view of the installation.
  • FIG. 2 is a detail on a scale larger than FIG. 1, and
  • FIG. 3 is another detail, also on a scale larger than FIG. 1. i
  • l is a strewing machine which acts at the same time as supply bin. It is equipped at its lower end with two slinger rollers 2 covered with prongs and rotating in opposite directions. As a result of the rotation of the slinger rollers 2, fine top-layer chips are strewn onto an intermittently driven steel belt 4 which rotates over rollers 3.
  • This belt 4 extends through a heated press consisting of a press table 5 and a raisable and lower' able hydraulically driven press plate 6.
  • the strewing machine 1 also acts intermittently. In fact, the slinger rollers 2 rotate only as long as the belt 4 is driven.
  • the nip present between the two rollers 2 and the speed of rotation of the rollers are so adapted to each other that a thin web of top-layer chips is formed on the belt 4.
  • an endless metal screen 9 which travels in the form of a belt over guide rollers 8.
  • the thin support layers which are produced in sections in endless sequence, which layers are smooth on the one side and rough on the other side, and may correspond with respect to thickness and flexibility approximately to relatively thin cardboard sheets, are now cut by means of an automatic cutter 11 into pieces 13 of equal length. These pieces are then taken over by a conveyor belt 12 and so arranged in a row that their ends overlap over a certain distance.
  • the overlap is always of such a nature that the rear end of each support layer lies above the front section of the next following support layer.
  • Another conveyor belt leads the intermittently fed support layers with uniform speed to the strewing machines and 22.
  • the spraying apparatus consists essen tially of a nozzle 16, a feed pump 17 and a supply container 18. The spraying of the precompacted support layers improves the adherence to the rest of the chips.
  • the wood chips discharged by the strewing machines 1, 20 and 22 have been previously treated in known manner with a thermosetting binder.
  • the precompacting of the thin support layers which are active as strewing, transporting and press supports in the example described need not necessarily be effected all the way to complete hardening of the binder. In many cases it is sufficient for the binder to be only partially hardened.
  • the final polymerization can then take place in the main press, which is not shown in the drawing.
  • the supply container of the strewing machine 20 contains coarser wood chips which are intended for the formation of the center or core layer of the three-layer boards to be produced. At its lower end the said container is closed off by two slinger rollers 21 rotating in opposite direction. These rollers throw the core-layer material onto the endless sequence of precompacted support layer 13 which have been provided with a thin film of glue. Behind the srrewing machine 20 there could, of course, also be provided vertically adjustable dosaging means, such as, for instance, a combing dosaging roller or the like.
  • the supply container of the strewing machine 22 which is equipped with slinger rollers 23 contains top-layer chips ofthe same type as the container of the strewing machine 1. These chips are now strewed onto the core-layer chips, whereby an endless board preform 24 is formed.
  • a longitudinally and transversely movable, automatically acting parting saw 25 whose shaft 26 is driven in a manner not shown in detail cuts the web 24 which has thus been formed into sections of equal length which correspond to the length of the wood chip boards to be produced.
  • the precompacted support layers are not cut and on the other hand that the cutting process takes place in each case in the vicinity of the rear edge of each support layer 13 (see FIG. 2).
  • each support layer 13 Due to the described manner of arranging the support layers 13 one behind the other and a proper selection of the line of cut upon the cutting of the still loose preforms, there is produced in connection with each support layer 13 a front section as seen in the direction of movement which is not covered with particles.
  • the preforms 24 can be conveyed in this manner into the main press, in which connection the support layers can then themselves be used as actual transportation supports in the same manner as the generally known transportation plates.
  • Method of producing compressed boards by hot pressing of board preforms consisting of particles treated with a thermosetting binder particularly for the manufacture of wood chip boards characterized by the fact that initially webs, which are thin as compared with the thickness of the board preforms, are formed from particles whereupon these webs are compacted by hot pressing to such an extent that the binder is at least partially set, and that thereupon the board preforms proper are formed by the strewing of particles onto these thin support layers which have been precompacted in this manner, and the boards are produced by hot pressing and combining of support layers and of board preforms.
  • Method according to claim 1 characterized by such a hot pressing of the thin support layers that the lower side becomes smooth and the upper side rough. 3. Method according to claim 1 characterized by the fact that the hot pressing of the thin support layers is interrupted before the binder, with which the particles have been treated, has been cured.
  • Method according to claim 1 for the manufacture of multi-layer boards with top layers of particles which are thinner than the core layer material characterized by the fact that for the formation of the precompacted support layers there is used a part of the particles provided for the production of the lower outer layer.
  • Method of producing compressed boards by hot pressing of board preforms consisting of particles treated with a thermosetting binder particularly for the manufacture of wood chip boards characterized by the fact that initially webs,which are thin as compared with the thickness of the board preforms, are formed from particles whereupon these webs are compacted by hot pressing to such an extent that the binder is at least partially set, and that thereupon the board preforms proper are formed by the strewing of particles onto these thin support layers which have been precompacted in this manner, and the boards are produced by hot pressing and combining of support layers and of board preforms, and characterized by the fact that the precompacted support layers serve as strewing, transporting, and pressing supports for the board preforms; and further characterized by the fact that the support layers charged with the board preforms are pulled by means of grippers of a conveyor device over a stationary support. 12

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
US00189223A 1970-10-15 1971-10-14 Method for the manufacture of compressed boards Expired - Lifetime US3762974A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1522770A CH522497A (de) 1970-10-15 1970-10-15 Verfahren und Vorrichtung zur Herstellung von gepressten Platten

Publications (1)

Publication Number Publication Date
US3762974A true US3762974A (en) 1973-10-02

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US00189223A Expired - Lifetime US3762974A (en) 1970-10-15 1971-10-14 Method for the manufacture of compressed boards

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US (1) US3762974A (de)
CH (1) CH522497A (de)
DE (1) DE2148082A1 (de)
FR (1) FR2111367A5 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013749A (en) * 1975-06-24 1977-03-22 Sten Thore Henriksson Method of shaping fiber materials
US4175150A (en) * 1976-11-05 1979-11-20 Masonite Corporation Urea containing high density skin fiberboard with a low density core
US4268565A (en) * 1977-07-28 1981-05-19 Masonite Corporation Post-press molding of man-made boards to produce contoured furniture parts
US4275027A (en) * 1977-07-28 1981-06-23 Masonite Corporation Post-press molding of man-made boards to produce contoured furniture parts
US4410380A (en) * 1978-10-05 1983-10-18 Eduard Kusters Method for the continuous manufacture of sheets of material especially wood chip board
US4735851A (en) * 1984-08-31 1988-04-05 Interox America Process for the assembly of wooden components and assembly of wooden components
US6243931B1 (en) 1998-09-15 2001-06-12 Batesville Services, Inc. Casket lid and method and making same
US20040244163A1 (en) * 1998-09-15 2004-12-09 Batesville Services, Inc. Casket lid and method of making same

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013749A (en) * 1975-06-24 1977-03-22 Sten Thore Henriksson Method of shaping fiber materials
US4175150A (en) * 1976-11-05 1979-11-20 Masonite Corporation Urea containing high density skin fiberboard with a low density core
US4268565A (en) * 1977-07-28 1981-05-19 Masonite Corporation Post-press molding of man-made boards to produce contoured furniture parts
US4275027A (en) * 1977-07-28 1981-06-23 Masonite Corporation Post-press molding of man-made boards to produce contoured furniture parts
US4410380A (en) * 1978-10-05 1983-10-18 Eduard Kusters Method for the continuous manufacture of sheets of material especially wood chip board
US4735851A (en) * 1984-08-31 1988-04-05 Interox America Process for the assembly of wooden components and assembly of wooden components
US6243931B1 (en) 1998-09-15 2001-06-12 Batesville Services, Inc. Casket lid and method and making same
US6503429B1 (en) 1998-09-15 2003-01-07 Batesville Services, Inc. Casket lid and method of making same
US20040244163A1 (en) * 1998-09-15 2004-12-09 Batesville Services, Inc. Casket lid and method of making same
US6849141B2 (en) 1998-09-15 2005-02-01 Batesville Services, Inc. Casket lid and method of making same
US6922877B2 (en) 1998-09-15 2005-08-02 Batesville Services, Inc. Casket lid and method of making same
US7147811B2 (en) 1998-09-15 2006-12-12 Batesville Services, Inc. Casket lid and method of making same
US7247264B2 (en) 1998-09-15 2007-07-24 Batesville Services, Inc. Casket lid and method of making same

Also Published As

Publication number Publication date
CH522497A (de) 1972-06-30
DE2148082A1 (de) 1972-04-20
FR2111367A5 (de) 1972-06-02

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