Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
  • B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
  • B27L11/02—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood shavings or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
  • B27L5/00—Manufacture of veneer ; Preparatory processing therefor
  • B27L5/02—Cutting strips from a rotating trunk or piece; Veneer lathes

Definitions

• the invention relates to a method for producing long chips or wood shavings (OSB) of defined dimensions.
• Long chips usually have thicknesses of 0.4 mm to 2 mm, widths of 5 mm to 100 mm and lengths of 50 mm to 300 mm.
• Strand lumber which is made of veneers with lengths over 1200 mm, widths from 100 to 2400 mm and thicknesses in the range of 2-5 mm, using methods such as plywood manufacturing are common, due to the large size of the Veneer strips made. This concerns in particular the drying, screening, Gluing and scattering. For example, drum dryers and Rotary gluing machines - as they usually are in OSB production be used - not used.
• the production of long chips with thicknesses is less than 0.5 mm with constant thickness by means of the above four methods difficult possible, because during the machining no exact guidance of the wood is possible and no pressure bar - as used in the veneer production will - is present.
• the long-cut pieces break for the most part in width undefined apart and have very different thicknesses. Long chips with thicknesses below 0.5 mm are used for the production of plates very smooth surfaces needed.
• the fluctuating long-carcass thickness a strong spread of basis weight the scattered OSB mat.
• the scattering of the mat is done by means of a quasi volumetric dosage, so seen in for a short interval about the same number of long chips are scattered. If one or several oversize long shavings are scattered, it comes to local high Basis weights. This leads to high local pressures during hot pressing specific pressures, to large variations in the plate properties and to an uneven hunchbacked plate surface.
• a fifth method according to US 3,164,511 is the Long-chip production from veneers by cutting the veneer (clipping) parallel to the wood fiber with a single knife described.
• the width of the long chip is defined, whereby it is also recognized that the Long chips have uniform width.
• This method is large-scale not applicable, because the amount of producible long shavings far too low for an OSB manufacturing facility.
• a clipping would be at a distance of 15 mm in the Continuous method require a cycle time of 250 cuts per second.
• the invention has for its object to provide an economical method for Production of long shavings for OSB production, with which Long chips can be produced with little variance of the dimensions and which is preferred in OSB with a smooth surface, OSB with a high modulus and for plates with thicknesses below 6 mm as well as for beam production are usable.
• the solution to this problem consists of claim 1 in a method for Production of long shavings or long shavings from wood with exactly defined dimensions, being from a roundwood or a tree trunk a veneer sheet with exact thickness is peeled or sliced, the Veneer sheet perpendicular to the grain with a hacker or a similar machine disassembled into strips of exact length and the strips with a flake splitter or similar machine to exact width be separated.
• the veneer is thus made with the conventional Veneer production used peeling or knife machines, so with a accurate guidance of the wood and a chipping using a Pressure bar.
• the log length is usually 1 to a maximum of 4 m.
• veneer sheets with a constant thickness generated in the range of 0.3 to 2 mm are veneer sheets with a constant thickness generated in the range of 0.3 to 2 mm.
• so-called waste veneers which only a length less than 20 cm and have a very different width
• Peeler which already has a greater length up to a maximum of half Have trunk circumference and different width.
• only one can endless veneer sheet are peeled off, provided the trunk does not crack having. If the trunk cracks, from the outside always towards the Run center point, has, arise so-called veneer sections.
• the Veneer paths have a width (ie in wood-fiber direction) in about the Log length on. But you can also in the case of AnMemper or of Be narrower refuse veneers.
• the veneer sheets produced in this way must, in the case of a longer continuous web split with a clipper to the width of the hacker. Subsequently the veneer sections become strips of exact length in the fiber direction in the Range 30 mm to 300 mm, in the broadest possible hacker, disassembled. there the veneer sections are transported in the direction of the grain and the Hacker fed. It produces strips of exact length and thickness. Then the exact width, in a so-called flake splitter, set.
• This machine consists of 2 rotating shafts on which Crushers are mounted.
• the veneer sheet is abandoned from above, with the Fiber direction is aligned parallel to the waves, and from the rotating Crushers transported to the stationary crushers.
• the division of the Veneer web in width takes place between the two breakers. In the result can produce thickness-accurate long chips of defined length and width getting produced. Furthermore, due to the application of the Veneering the possibility of very thin long chips with a thickness of 0.5 mm.
• the length in the fiber direction of Veneer web is over scratching knife or over other cutting tools set.
• the scoring knives are made on the pressure bar and scratch in the roundwood just before it is peeled.
• the scoring knife or one Other cutting tool can be attached to the veneer sheet as desired Veneer or beach should be produced, hired or removed become. If a wide continuous veneer sheet can and should be produced, the scoring knives can be turned off.
• Veneer sheets are transported separately from the normal veneer and divided with a package scissors in the width (transverse to the fiber direction).
• the Package scissors has approximately a length of the roundwood and a width a cycle time of 2 seconds (peeling speed 200 m / min) of 6 m. The distances of the knives on the package scissors correspond to the veneer width.
• the inventive method is particularly advantageous for hardwoods To use, as in the normal OSB knife Ringzerspaner hardwoods only very difficult to machine long slices of equal width and thickness. It is also economically, since no sawdust incurred and the peel-off roll to very useful wood chips for paper or MDF production can be machined or cut to length with one Knife ring chipper for a middle layer of an OSB board.
• Long shavings of the same thickness and width dimensions are used as 3-D long shavings for surface layers of OSB, in beam production or for thin OSBs of 2 mm to 6 mm thickness.
• the long chips can also be spread by means of a vacuum scattering to a two-layer web for thin OSB.
• Particularly economical is a wood-based panel of long shreds, which consists of an upper and lower outer cover layer of the 3-D long shavings according to this invention with a weight of 30 - 250 g / m 2 and one or more other layers of conventional long shavings.
• This plate has a very smooth surface and can be directly coated with a thin melamine paper of 80 g / m2 and less.
• the 3-D long chips of this plate preferably have a thickness in the range of 0.35-0.45 mm.
• the rotating motion releases air from sucked up and discharged down.
• This machine can handle it as well be used for drying when the sucked air is heated.

Landscapes

• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Mechanical Engineering (AREA)
• Manufacture Of Wood Veneers (AREA)
• Debarking, Splitting, And Disintegration Of Timber (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (3)

Cited By (12)

Families Citing this family (1)

Family Cites Families (9)

• 2003
  • 2003-10-21 DE DE2003149485 patent/DE10349485A1/de not_active Withdrawn
• 2004
  • 2004-10-21 CN CNA2004100882906A patent/CN1608815A/zh active Pending
  • 2004-10-21 EP EP04025085A patent/EP1525965A3/fr not_active Withdrawn

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