In a wood processing industry, wood waste is an arising issue. The wood processing industries want to convert the wastes into profit. The processed wood waste discharged from a size-reduction machine varies widely in sizes. The general geometric form of the processed wood may range from a coarse fragment or shred of wood to a sharp edged ship. Most manufacturing feedstock specifications call for a certain size range of shreds and chips. Hence, processors must remove the unacceptable sizes from the fiber to satisfy these size requirements. Fragments or chips that are larger than the allowable size ranges are referred as overs while smaller are referred as fines. The wood fiber that meets the specified size range is referred as accepts. A manufacturing feedstock specification limits the amount of overs and fines that can accompany accept in a given shipment of wood fiber, usually by establishing an allowable weight percentage. Although careful adjustments to the size-reduction equipment can maximize the production of accepts from the wood waste, the production of overs and fines is an inevitable side effect of any size-reduction process. Some size reduction equipment has a tendency to produce more overs and fines than others.
The best practice recommends using gyratory vibrating screen to separate overs and fines from acceptable processed wood fiber. A gyratory screen is a rectangular shaped steel mesh with carefully sized openings that segregate material according to size. Henan Pingyuan gyratory vibrating screen can be customized more than one deck. The segregation starts with removing over-sized material and then graduating down to the smallest desired size. Through a gyrating movement of the equipment, the relatively small particles fall through the screen while the relatively large particles remain on top of the screen. Wood waste that cannot fall through the screen vibrates to the sides or apron of the screen where it exists through a out-feed chute to a dedicated conveyor.
Installing gyratory screen downstream from the size-reduction equipment at a wood waste processing facility to remove excess overs and fines from the end product. Following is a description of the selection consideration for gyratory vibrating screen:
Selection Consideration
Operational issues
- Through work with an equipment vendor, a processor can size gyratory to handle the types and volumes of wood waste processed at a given facility. The gyratory screens effectively segregate by size and are standard equipment in the industry.
- A gyratory screen is usually installed on a decline and provides elliptical motion in a primarily horizontal plane. The gyratory motion is very efficient for the accurate sizing of wood chips because it causes each chip to constantly reorient itself while moving across the screen surface. The chip will tend to pass through the screen if any of its dimensions qualifies for the correct size. This unit is widely used in sizing chips for pulp production. The elliptical motion also spreads material across the entire surface to maximize throughput and effectiveness
Capital cost
- The gyratory screen purchased must be long lifespan which can reduce the cost of replacement. Henan Pingyuan provides customer with customized design and affordable prices with long life span gyratory screen.
Maintenance issues
- Gyratory screen require good support structures and foundations because of the dynamic action of the machines. If properly installed, these screens will not require excessive maintenance. They do require regular maintenance attention to ensure that fasteners remain tight and support structures are sound so that the units will not self-destruct, If it left unattended for an extended time.
- The screening of wet material can create maintenance and performance problems when holes become constricted or plugged.
Safety issues
- The general operation of these screens creates no unique safety issues as long as they are properly installed, maintained and monitored. The screens must have adequate clearance for operation so as not to create potential pinch points. The gyratory screens can be noisy because of the movement of the chips. Processors can enclose the screens to control dust issues.
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