Precigrader - Timber machine strength grading
The Precigrader is a reliable and proven system that provides precise machine timber strength grading up to production rates of 180 boards per minute. The Precigrader has strength grading approval to EN14081 for the UK and Irish grown green and dry UK Spruce (Sitka Spruce and Norway Spruce) for grades C16, C18, C24, C27 and TR26.
|Thickness range||Width range||Length range||Rate|
|34…82 mm||69…247 mm||0.9…6.0 m||Up to 180 boards per minute|
Each piece of timber is hit with a spring-loaded impact mechanism, the vibration response is picked up by microphones positioned close to the timber end. The resultant resonance frequency and timber density are processed and using established properties resonance frequencies the dynamic E-modulus (MOE) is established. The dynamic MOE correlates to the static stiffness and strength and is used for grading in the predefined classes.
- Strength grading of green sawn timber
- Strength grading of dry sawn timber
- Strength grading of timber in planer mills
Developed by Dynalyse in Sweden the system is installed in over 140 sawmills, planer mills and glulam factories. The system is proven to reliable and uses modern and robust technology.
Strength grading in accordance with EN14081 for UK & Irish grown timber
The Precigrader has strength grading approval to EN14081 for the UK and Irish grown green and dry UK Spruce (Sitka Spruce and Norway Spruce) for grades C16, C18, C24, C27 and TR26.
The system can easily be retrofitted to existing transverse conveyors taking only 1.35 of space
Integration with existing sawmill equipment
LIMAB’s long experience in supplying the sawmill industry means that the equipment can be easily be retrofitted to existing lines or fully integrated with new ones. Interfaces available to many of today’s OEM sawmill equipment suppliers.
LIMAB provide a complete turn-key solution. The Precigrader includes all the hardware and software needed for any factory installation. LIMAB provide commissioning, training and on-going product support and service.
|Board types||Sawn or planed surface, green or dry|
|Timber species (UK & Irish grown)||Sitka Spruce and Norway Spruce|
|Board thickness||34…82 mm|
|Board width||69…247 mm|
|Board length (typical)||0.9…6.0 m|
|Approvals for UK & Irish grown timber||EN14081, C16, C18, C24, C27 and TR26|
|Minimum space needed on cross conveyor line||1.25 m|
|Timber end alignment||Within 10 mm|
|Main unit dimensions||575 x 600 x 200 mm|
|Maximum rate||PG100 = 100 boards per minute
PG180 = 180 boards per minute