US3576349A - Apparatus for the manufacture of wood fiber panels - Google Patents

Apparatus for the manufacture of wood fiber panels Download PDF

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Publication number
US3576349A
US3576349A US818984A US3576349DA US3576349A US 3576349 A US3576349 A US 3576349A US 818984 A US818984 A US 818984A US 3576349D A US3576349D A US 3576349DA US 3576349 A US3576349 A US 3576349A
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United States
Prior art keywords
blades
band
conveyor band
upper side
distribution box
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Expired - Lifetime
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US818984A
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English (en)
Inventor
Andre Mark
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Individual
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Individual
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Publication date
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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
    • B27N3/14—Distributing or orienting the particles or fibres

Definitions

  • the present invention refers to the manufacture of hard plates or panels of wood fibers by the so-called dry" process.
  • the dry process consists in realizing on an appropriate conveyor band one or several superposed layers of wood fibers which have been previously impregnated with a polymerizable resin and in compressing between heated platens the fibrous cushion thus obtained in order to cure the resin which acts as a binder.
  • the panels thus obtained are extremely strong and rigid.
  • the disadvantage of this arrangement is that the edges of the con veyor band are underfed, the fibrous cushion being less dense and less thick in the corresponding zones. It has been proposed to separate the defective marginal portions of the fibrous cushion,'the fibers thus eliminated being recycled, but this results in a quite intricate apparatus and increases the consumption of power. It has also been suggested to combine the pneumatic feed of the fibers with a mechanical distribution across the width of the conveyor band, but without satisfactory results in actual practice.
  • a further object of this invention is to provide an apparatus of the kind above referred to, wherein" the negative pressure which realizes the fibrous cushion on the conveyor band may be adjusted as desired along the length of this cushion, and also across the width thereof, if required.
  • an apparatus for the manufacture of wood fiber panels by the dry process of the kind comprising a pervious conveyor band supported by the perforated upper side of an air chest in which a negative pressure is maintained, and pneumatic conveying means to The air chest may be internally divided into a number of chambers in the longitudinal and/or in the transverse direction with respect to the advance of the conveyor band, means being provided whereby the negative pressure may be adjusted as desired in each chamber.
  • FIG. 1 is a transverse section of an apparatus according to the invention for the manufacture of panels of wood fibers.
  • FIG. 2 is a longitudinal section taken through line II-II of FIG. I. the plane of section of FIG. 1 being indicated by line H.
  • FIG. 3 reproduces to an enlarged scale a detail of FIG. 2.
  • FIG. 4 is a section taken along line lV-IV of FIG. 3.
  • FIG. 5 is a view similar to FIG. 3, but illustrating a slightly modified arrangement.
  • FIG. 6 is a horizontal section taken along line Vl-VI of FIG. 2.
  • the apparatus illustrated in FIGS. l and 2 comprises a downwardly-diverging pyramidal inlet chamber or hood I the upper end of which is connected with the conveying conduit 2 through which the airstream loaded with wood fibers is supplied to the apparatus.
  • the lower end of chamber 1 opens into a distributing box 3 of substantially rectangular cross section, a highly flexible seal 4 being interposed between box 3 and chamber 1 in order to permit the former to vibrate substantially freely.
  • An air chest 5 is disposed below the lower end of box 3, the horizontal upper side of this air chest being formed with perforations 5a.
  • FIGS. l and 2 For the cleamess of the drawing conveyor band 6 has been illustrated in FIGS. l and 2 as slightly spaced from the upper side of chest 5 while it is actually in contact therewith so as to be slidably supported thereby.
  • Band 6 moves from right to left in FIG. 2.
  • the vertical walls of air chest 5 extend upwardly above the perforated upper side thereof and they are connected in an airtight manner with the lower edge of the distributing box 3 by means of another highly flexible seal 7 similar to the above-mentioned seal 4.
  • Each of the vertical walls of box 3 which extend transversely with respect to conveyor band 6 is formed with an elongated horizontal slot 3a (FIGS. 1 and 3).
  • a number of vertical streamlined air-guiding blades 8 are disposed within box 3, each being carried by a longitudinal rod 9 the protruding ends of which are passed through slots 3a and carry blocks 10 which are secured thereto in any appropriate manner, not indicated in FIGS. 2 and 3.
  • Each of the transverse walls of box 3 carries a guide formed of two parallel U-shaped sheet iron members 11 which define a gutter in which blocks 10 are slidably retained. This gutter is closed by a flat lateral cover 12 which forms a substantially tight seal.
  • blocks 10, and therefore blades 8 may be disposed at any position desired across the width of the perforated band 6 in order to determine intermediate air passages of variable cross section.
  • Blocks It may be fixed at the desired position in any appropriate manner.
  • the upper U-shaped member 11 has a series of holes lla which may selectively receive a screw 13 screwed into each block 10. Holes 11a are quite close to each other and those which are not used may be plugged.
  • blocks 10 are slidably mounted on a rod 14 and each has a setscrew 15, cover 12 being easily removable to permit access to screws 15.
  • the ends of rod 14 are appropriately secured to U-shaped members 11.
  • the air chest 5 is provided with a narrow horizontal inlet 5b (FIG. 2) for the conveyor band 6 and with a corresponding outlet 50 in the form of a rectangular nozzle.
  • the upper side of this nozzle, which has been illustrated as rigidly secured to the remainder of the air chest is preferably hingedly supported and may be adjusted at will in accordance with the thickness of the fibrous cushion A formed of the conveyor band.
  • Vibrators 16 are secured against the outer side of the lateral walls of box 3.
  • the inner space of the air chest 5 below the perforated upper side 5a thereof is divided into eight individual chambers by a transverse partition 5d and by three longitudinal partitions 5e. These chambers are individually connected to one of two suction lines 17 by valves 18, each line 17 being in turn connected with a suction fan 19. By appropriately adjusting valves 18 it is thus possible to control at will the negative pressure within each chamber and to obtain a uniform fibrous cushion issuing from the apparatus.
  • the wood fibers along the length of the cushion may be controlled by acting on valves 18 so as to increase the negative pressure in the four chambers of air chest 5 which are situated at the left of transverse partition 5d.
  • the thickness of fibrous cushion A may thus increase regularly between inlet 5b and outlet 5c as this is desirable for obtaining good results.
  • An apparatus for use in the manufacture of panels from fibers impregnated with a binder comprising:
  • said blades having a streamlined cross-sectional profile.
  • each of said blades having two ends and having at each end a longitudinally protruding rodlike extension, said means to define a closed space above the perforated upper side of said air chest comprising two substantially vertical walls extending transversel with respect to said conveyor band and being each forme with an elongated horizontal slot, each of said extensions being passed through one of said slots, and said apparatus further comprising means exterior to said closed space to adjustably retain said extensions in position along said slots.
  • said means to define a closed space above the perforated horizontal upper side of said air chest comprising:
  • a downwardly diverging hood above said distributing box said hood having an upper end and a lower end, with said means to supply an airstream loaded with fibers being connected with the upper end of said hood;
  • said distribution box having transverse walls each formed with a horizontal elongated slot, each of said blades having two ends and having at each end a longitudinally protruding rodlike extension, each of said extensions being passed through one of said slots, and said apparatus further comprising on each of said transverse walls of said distribution box means exterior to said box to adjustably secure said extensions in position across the width of said box and means to substantially prevent airflow through each of said slots.

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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)
US818984A 1968-05-03 1969-04-24 Apparatus for the manufacture of wood fiber panels Expired - Lifetime US3576349A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR69049985 1968-05-03

Publications (1)

Publication Number Publication Date
US3576349A true US3576349A (en) 1971-04-27

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ID=9695339

Family Applications (1)

Application Number Title Priority Date Filing Date
US818984A Expired - Lifetime US3576349A (en) 1968-05-03 1969-04-24 Apparatus for the manufacture of wood fiber panels

Country Status (3)

Country Link
US (1) US3576349A (enrdf_load_stackoverflow)
CA (1) CA937370A (enrdf_load_stackoverflow)
FR (1) FR1587056A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494278A (en) * 1977-11-08 1985-01-22 Karl Kristian Kobs Kroyer Apparatus for the production of a fibrous web
EP0149287A1 (en) * 1984-01-12 1985-07-24 Board Of Control Of Michigan Technological University Flake aligner
US4546622A (en) * 1982-04-03 1985-10-15 Sulzer Morat Gmbh Circular knitting machine for producing knit goods having enmeshed fibers
US5245728A (en) * 1991-05-27 1993-09-21 Winkler & Duennebier Maschinenfabrik Und Eisengiesserei Kg Clump dissolving baffle in conduit between flake supplying and pad forming devices
US5527171A (en) * 1993-03-09 1996-06-18 Niro Separation A/S Apparatus for depositing fibers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE412552B (sv) * 1976-07-05 1980-03-10 Defibrator Fiberboard Ab Sett och anordning vid framstellning av skivor eller plattor av cellulosa- resp fiber- eller spanmaterial enligt den torra metoden
DE3902646A1 (de) * 1989-01-30 1990-08-02 Ruetgerswerke Ag Vorrichtung und verfahren zum dosierten fuellen stationaerer pressformen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2635301A (en) * 1948-09-30 1953-04-21 Plywood Res Foundation Web or mat forming device
US2648876A (en) * 1947-11-18 1953-08-18 West Point Mfg Co Method and machine for producing unwoven fabrics
US3032836A (en) * 1958-10-21 1962-05-08 Rockwool Ab Apparatus for the distribution of mineral wool on a band conveyor
US3150215A (en) * 1959-03-30 1964-09-22 Willits Redwood Products Compa Method of producing acoustic tile from redwood bark fibre and product obtained
US3252186A (en) * 1963-01-21 1966-05-24 Wood Conversion Co Differential fiber dispersing rolls and felting therefrom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2648876A (en) * 1947-11-18 1953-08-18 West Point Mfg Co Method and machine for producing unwoven fabrics
US2635301A (en) * 1948-09-30 1953-04-21 Plywood Res Foundation Web or mat forming device
US3032836A (en) * 1958-10-21 1962-05-08 Rockwool Ab Apparatus for the distribution of mineral wool on a band conveyor
US3150215A (en) * 1959-03-30 1964-09-22 Willits Redwood Products Compa Method of producing acoustic tile from redwood bark fibre and product obtained
US3252186A (en) * 1963-01-21 1966-05-24 Wood Conversion Co Differential fiber dispersing rolls and felting therefrom

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4494278A (en) * 1977-11-08 1985-01-22 Karl Kristian Kobs Kroyer Apparatus for the production of a fibrous web
US4546622A (en) * 1982-04-03 1985-10-15 Sulzer Morat Gmbh Circular knitting machine for producing knit goods having enmeshed fibers
EP0149287A1 (en) * 1984-01-12 1985-07-24 Board Of Control Of Michigan Technological University Flake aligner
US5245728A (en) * 1991-05-27 1993-09-21 Winkler & Duennebier Maschinenfabrik Und Eisengiesserei Kg Clump dissolving baffle in conduit between flake supplying and pad forming devices
US5527171A (en) * 1993-03-09 1996-06-18 Niro Separation A/S Apparatus for depositing fibers

Also Published As

Publication number Publication date
CA937370A (en) 1973-11-27
FR1587056A (enrdf_load_stackoverflow) 1970-03-13

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