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Precigrader

Example of the Precigrader in action on production wood line

Sawmill Timber Strength Grading

The Precigrader is a reliable and proven system that provides precise machine timber strength grading up to production rates of 260 boards per minute. The technology uses direct measurement through acoustic technology with a unique electronically controlled hammer and provides an accurate determination of the E-modulus and density of wood. The Precigrader has strength grading approval to EN14081 for UK and Irish grown green and dry UK Spruce (Sitka Spruce and Norway Spruce) for grades C16, C18, C24, C27, C40 and TR26.

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Quick Spec

Thickness Range Width range Length range Rate
34…82 mm 69…247 mm 0.9…6.0 m Up to 260 boards per minute

Operating Principle

Each piece of timber is hit with an electronically controller hammer, 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

Proven system

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 UK and Irish grown green and dry UK Spruce (Sitka Spruce and Norway Spruce) for grades C16, C18, C24, C27 and TR26.

Small footprint

The system can easily be retrofitted to existing transverse conveyors taking less than 2m 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 to new ones. Interfaces available to many of today’s OEM sawmill equipment suppliers.

Complete package

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.

 

 

Specification
Board types Sawn or planed surface, green or dry
Timber species (UK & Irish grown) Sitka Spruce and Norway Spruce
Board thickness (typical) 34…82 mm
Board width (typical) 69…247 mm
Board length (typical) 0.9…6.0 m
Approvals for UK & Irish grown timber EN14081, C16, C18, C24, C27, C40, T15, T22,  and TR26
Minimum space needed on cross conveyor line 1.35 m appx.
Timber end alignment Within 10 mm
Main unit dimensions 575 x 600 x 200 mm
Maximum rate 260 boards per minute

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