Classifications

• • 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
  • B27N3/143—Orienting the particles or fibres
• • 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

• Particles such as wood chips, wood fibers or the like on a continuously moving surface
• the invention relates to a device for aligning and depositing elongated lignocellulosic and / or cellulosic particles, such as wood shavings, wood fibers or the like, provided with at least one binder on a continuously moving base to form a fleece for the subsequent production of plates with a dosing hopper containing such particles, a unit for transferring the particles to an orientation unit, which is arranged above a continuously moving base, the distance between the orientation unit and the continuously moving base being higher than the top of the nonwoven to be formed.
• a device which serves to align lignocellulosic particles (strands) provided with a binder, such as wood shavings, wood fibers or the like, which, when applied to a continuously moving support, form a fleece whose Particles aligned essentially parallel to one another and running in the direction of movement or transverse to the direction of movement of the continuously moving support, consisting of several thin guide surfaces, the mutual, equal distances of which are smaller than the lengths of the particles to be aligned and whose lower edges are higher than the top of the to be formed Fleece and which are so movable that each guide surface is movable in the opposite direction relative to the two adjacent guide surfaces.
• a binder such as wood shavings, wood fibers or the like
• a plurality of protrusions spaced apart from one another protrude in the same plane above the upper edge of each guide surface, the thickness of which is equal to the thickness of the guide surface.
• These projections are designed as regular quadrilaterals with two parallel edges and an upper edge lying at the top, parallel to the edge edge, and / or as triangles with an overhead tip. What is achieved is that those particles that initially span the upper edges of two or more moving guide surfaces are twisted in an arc and then fall parallel to each other on the continuously moving surface between the guide surfaces, but there is at least the risk of blockages and the risk of damage to the particles.
• a differently constructed device for aligning wooden particles (strands) across the transverse width of a moving support is known from German Offenlegungsschrift 2,523,515.
• This device includes a pre-orientation unit which has a plurality of upright ribs, a drum with wooden strand orientation baffles attached to the outer periphery thereof, and a catch device which separates the wooden strands between an arcuate casing and a plurality of spaces, each of which passes through the peripheral surface of the drum and a pair of baffle plate surfaces is held captive until they are released at a predetermined location in order to be able to fall parallel to one another onto a moving surface on which they lie transversely to their direction of movement.
• the throughput and the degree of orientation of the particles are unsatisfactory.
• the invention has for its object to provide an alignment device of the type mentioned in such a way that the degree of orientation of the particles can be improved with high throughput and without damage to the particles in trouble-free operation.
• the orientation unit consists of a plurality of fan rollers, which are arranged at right angles to the direction of movement of the continuously moving support in an at least substantially horizontal plane and which rotate continuously against the direction of movement and which rotate the individual compartments , air-impermeable alignment surfaces are curved and / or angled at least in the area of their free ends against the direction of movement of the continuously moving base.
• the object is achieved in that the orientation unit in the direction of movement of the support has a plurality of vertical straightening surfaces arranged parallel to one another across the width of the support with projections projecting beyond its upper marginal edges, and each adjacent straightening surface can be driven in the opposite direction that each straightening surface executes superimposed movements both in accordance with their longitudinal extent and perpendicular to it.
• Figure 1 is a schematic representation of a first embodiment of the invention with a plurality of fan rollers
• Figure 2 is a schematic representation of a second embodiment of the invention with a plurality of flat strip-shaped straightening surfaces.
• FIG. 1 shows a dosing hopper 1, which can be designed in a conventional manner and, in addition to a conveyor belt on the bottom and stripping rollers, has a feed unit 2 by means of which the glued elongated particles containing lignocellulose and / or cellulose are transferred via pendulum flaps 3 to an orientation unit 4 enclosed in a housing provided group of opening rollers 5 are supplied.
• the opening rollers 5 extend across the width of a moving base 10 on which the respective fleece is formed.
• a first group of opening rollers 5 is driven in a counterclockwise direction and a second group in a clockwise direction, so that the particulate material supplied via the feed unit 2 is evenly distributed and correspondingly meets a group of fan rollers 7 which are below the Group of opening rollers 5 are arranged and driven all around against the direction of movement of the moving base 10.
• the fan rollers 7 have a plurality of alignment surfaces 8, which are air-impermeable and have such a mutual distance that only so much particle material can be accommodated in a compartment 9 that a complete alignment of the elongated particles can be ensured.
• the alignment surfaces 8 are designed in such a way that they only release the absorbed and, due to the flat structure, aligned elongate particles transversely to the direction of movement of the base 10 from the compartments 9 when the particle's path of travel between the fan roller 7 and the moving base 10 or on this moving pad 10 forming fleece is minimized.
• the alignment surfaces 8 are curved and / or angled, at least in the region of their free ends, counter to the direction of rotation of the fan roller 7.
• the alignment surfaces are continuously curved, are curved with a radius of curvature that decreases toward the free end, or are designed to be curved only in the region of the free ends.
• provision can also be made to bend the alignment surfaces 8 in particular several times, so that there are several flat partial surfaces which are connected to one another via kink locations and which approximate a curved structure in the manner of a polygon.
• the orientation unit 4 enclosed by a housing is preferably designed to be height-adjustable with respect to the moving support 10, as is indicated by double arrows.
• the axes of the fan rollers 7, which are of identical design to one another, preferably lie in a plane which, with the moving base 10, has a course which at least substantially corresponds to the angle of rise of the fleece formed on the base 10.
• the embodiment according to FIG. 2 differs from the embodiment according to FIG. 1 in that, instead of the group of fan rollers 7, a group of straightening surfaces 11 is arranged below the opening rollers 5. These straightening surfaces 11 are at a mutual distance from one another which is less than the longitudinal extent of the particles to be aligned. There are so many parallel straightening surfaces 11 provided that particles coming from the feed unit 2 can only reach the base 10 via the arrangement of straightening surfaces 11 extending over the entire width of the moving base 10.
• the straightening surfaces 1 1 ' must ensure that the particles reaching the straightening surfaces 1 1 unoriented via the opening rollers 5 are oriented in such a way that they run parallel to the direction of movement of the base 10 and arrive at this base 10 in an appropriately aligned manner.
• the straightening surfaces 11 are on the one hand set in motion and on the other hand provided with projections 12 on their upper side so that corresponding straightening forces can be exerted on the particles.
• the straightening surfaces 11 not only execute a movement parallel to the moving base 10, but that these straightening surfaces 11 also always have movement components perpendicular to this base 10, since in this way the alignment effect, i.e. the degree of orientation is decisively improved and the performance of the overall device is accordingly increased accordingly.
• the straightening surfaces 11 arranged next to one another, of which the neighboring straightening surfaces 11 are always driven in opposite directions, are articulated at the end to swivel arms 13, and this articulation leads to the straightening surfaces 11 being a rocking movement, i.e. perform a movement with horizontal and vertical movement components.
• the straightening surfaces 11 are provided on their upper side with friction-increasing projections 12.
• projections 12 can be designed in the form of waves or arches, but also in the form of triangles, rectangles, trapezoids and the like have, wherein edges of the projections are preferably rounded to ensure a gentle and damage-free treatment of the particles.

Landscapes

• 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)
• Preliminary Treatment Of Fibers (AREA)
• Debarking, Splitting, And Disintegration Of Timber (AREA)
• Feeding Of Articles To Conveyors (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Nonwoven Fabrics (AREA)

Priority Applications (1)

Applications Claiming Priority (3)

Related Child Applications (1)

Publications (2)

Family

ID=8039290

Family Applications (2)

Family Applications Before (1)

Country Status (8)

Families Citing this family (14)

Family Cites Families (9)

• 1997
  • 1997-04-21 DE DE29707143U patent/DE29707143U1/de not_active Expired - Lifetime
• 1998
  • 1998-04-20 CN CN98805276A patent/CN1258244A/zh active Pending
  • 1998-04-20 EP EP01107199A patent/EP1114705A1/fr not_active Withdrawn
  • 1998-04-20 AT AT98922744T patent/ATE219994T1/de not_active IP Right Cessation
  • 1998-04-20 WO PCT/EP1998/002313 patent/WO1998047678A1/fr active IP Right Grant
  • 1998-04-20 NZ NZ500290A patent/NZ500290A/en unknown
  • 1998-04-20 EP EP98922744A patent/EP0977656B1/fr not_active Expired - Lifetime
  • 1998-04-20 DE DE59804676T patent/DE59804676D1/de not_active Expired - Fee Related
  • 1998-04-20 AU AU75273/98A patent/AU739553B2/en not_active Ceased
  • 1998-04-20 US US09/403,172 patent/US6276511B1/en not_active Expired - Fee Related

Non-Patent Citations (1)

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