VER3816 - Wood Yard for Processing Spruce and Beech Trees
Trees Ø: 7 to 75 cm - Length up to 10,8 m
Capacity: 300 m3/hr

Technical description
  • Trunks received and cut to two meters logs

    Cutting line drawing

    Whole trees are loaded at receiver bin (12 m width) and carried up by 14 chain conveyor on table, adjusted by cross screw at one side of the table and delivered straight to cutting saws.

    Receiver

    There are five saws 2 meter diameter, thickness 2,5 cm in a “V” configuration space two meters apart. The line has several new as well as older engines of 500 V voltage system from Brown Boveri BBC Switzerland. The saws are powered by motors 55 Kw.

    Transport to saws

    Cutting saws

    Motors


  • Debarking
    The two meter logs are transported to debarking drum hopper (dry system operated) Ø 4 m, length 20 m, drive by 5 hydraulic motors with hydraulic station and oil cooling. Drum is turned by steel wheels against drum rings.

    Logs transport to drum

    Bark and other wood waste falls through drum slots and is collected with the sawdust from log cutting by belt conveyors and transported to waste bins through drum chipper or shredder for disintegration of the bigger pieces (3 x shredder units from Heinrich Wigger). All waste is mixed with slurry from waste water treatment and burned.

    Debarking drum

    Driving rolls

    Drum rings

    Hydraulic drives

    Waste desintegrator (shredder)

    Desintegrators are from Heinrich Wigger GmbH Westfalen, now in storage, some without motor.

  • Transport to chipping machines
    Transport of debarked logs is done by belt conveyor system. There is also another line for transport of long trees and wood waste, that is delivered to a smaller chipper with horizontal infeeding without debarking.

    Line for transport of long trees and waste


  • Chipping
    There are two chippers: Hurican IIIS WHHW 21/8, Ø 2100 mm with 8 knives, horizontal feeding, capacity 2OO m3/hr with hydraulic motor 600 Kw, 480 rpm and Hurican IV WHHW 24/8, Ø 2400 mm, 8 knives, gravitation feed, capacity 240 m3/hr, hydraulic motor 860 Kw, 480 rpm from Heinrich Wigger & co. UNNA (Westfalen). Delivered in 1978 and 1979.
    Horizontal infeed is provided by set of grooved rolls forcing wood against chipper disc, and by gravitational feed with logs falling down a slooping chute inside chipper.

    Chipper WHHW 21/8

    Knives


  • Chips handling and storage
    The chippers rotor is equipped by marginal paddles for blowing of chips from chipper. In the next stage they are carried by belt conveyors and pressurised air to the chip storage silo. Out feed from the chip storage silo is by screw feed to pneumatic transport for cooking. The last part of transport to cooking plant is done by vertical bucket transport. Pressurised air for pneumatic transport is provided by a set of compressors. There are 5 units, two of which are reserve. Several units were found at enclosed storage, some of them complete with motors. Compressors are from Hartmann Offenbach installation year 1956.

    Chips transportation

    Chips to silo: chips vertical conveyor to cooking plant

    For pneumatic transport there are 3 compressors from Hartmann Offenbach (year 1966) and 2 compressors in reserve. Another two without motor and one smaller size are in storage and two another pieces are connected but without motors and 10 years out of operation.

    Compressor station

    Before storage, the chips are screened through two vibrating screens KMW for sawdust and removal of oversized pieces.
    Chip screener

    Drawing of chips screener

    Screens are from 1978

  • Reject, waste, bark and sawdust treatment and handling
    Transport by belt conveyors, storage at wood waste bin and with bark and slurry from biological waste water treatment burned.
    The bark is stored in bark silo from Schlon & Rindler Werke.

    Observation
    All Wood yard equipment is able to operate with any pulping technology in spite of age and fact, that some parts are more or less time-worn.
    In light of a high standard of maintenance the wood yard is in good condition.