Tuesday, September 25, 2018
Sawmillers all share the same objective - to produce sawn timber in the most cost-effective and efficient way possible to maximise profits.
This search for bigger efficiency includes a number of factors.
The total volume through the sawmill and the conversion to sawn timber typically called recovery is an important measure of overall efficiency.
When small or medium-sized log diameters or low-value logs impact on recovery, it can reduce efficiency.
But when a changing forestry environment where small to medium size diameter and low-value logs from thinnings operations or the tops of harvested trees is readily available, it can be an opportunity to boost efficiency if the line is tooled to process this type of log accurately and consistently.
Increased mechanisation that can smooth the flow of logs through the line and reduce labour costs bills, reduced energy and maintenance costs, and reduce costs to train staff to ensure accurate cutting are further opportunities to improve efficiency.
SLP - A blueprint for efficiency
Wood-Mizer’s Smart Log Processing system is a flexible series of modular products that use thin-kerf blades on each sawmill unit in the line to deliver better yield and higher profits from low-value logs between 100 - 400mm in diameter to increase overall efficiency.
The SLP line has been successfully used in sawing high-quality structural timber to pallet material. It is a diverse line that can be adapted to many different configurations to suit the sawmillers needs.
An example of a TVS unit
Because the line is modular, machines in the line can be arranged to suit the cutting needs of the sawmiller. The SLP line utilises Wood-Mizer’s modular system, with many of the machines using the same electrical parts, belts, and bearings, requiring the sawmiller to keep fewer spares on hand.
A six-head Wood-Mizer resaw can process 6 boards and one slab in one pass. The heads are modular and the number of heads can be customized to customer specification.
The SLP line:
Ø Costs less than similar lines
Ø Requires low installation costs
Ø Modular to expand with sawmill needs
Ø Produces more product and less waste
Ø Lowers power consumption
Ø Is inexpensive to maintain
Ø Uses thin-kerf blades to deliver better log yield than other processing methods.
Ø Blade maintenance easy with Wood-Mizer’s proprietary blade maintenance equipment
Ø Includes material handling systems to increase mechanisation and throughput
Ø An ideal sawmilling solution for markets where small to medium-sized logs
Ø Easy to use and low training costs
A typical SLP line consists of the following units:
Ø A Twin Vertical Saw (TVS) for primary breakdown to produce two-sided cant.
Ø A Single Vertical Saw (SVS) for secondary breakdown to produce the third side of three-sided cant
Ø Resaw options on both the secondary breakdown and recovery side. Up to six resaws inline to produce six boards and one slab in one pass
Ø Edger on recovery to square slab sides and cut boards into final spec boards
Ø Various log in and outfeed options to allow for stable and accurate cutting during primary breakdown
Ø Various material handling options to increase mechanisation and reduce labour costs
SLP - Tried and tested
The SLP system was first introduced to the market in 2007. Since then, the solution has found international application in sawmilling markets around the world.
South Africa has been no exception. Full lines or variations of the SLP system that have slotted into existing sawmilling lines now operate throughout South Africa.
Wood-Mizer’s TITAN EG800 opens more opportunity for potential SLP customers. It can be added to SLP lines and rip hardwoods like Eucalyptus that are in block sizes of up to 120 mm into multiple boards in one pass.
Telling examples of sawmills that have run the SLP system in SA with success are Spitzkop Sawmill, CRS Timbers and Holkay Sawmill, to mention a few.
An SLP system that went live in SA in the Western Cape in 2015 illustrates the value of the solution further.
When the system was commissioned in 2015, the sawmill owners had a projected monthly figure of
800 m³ into the mill and 400 m³ of sawn timber out and a recovery percentage of 66%.
Current figures for the unit stand at 2250 m³ into the mill and 1050 m³ of sawn timber out per month. Recovery stands at 72%. Log diameters vary from 130 mm upwards and logs lengths of between 2,4 and 3 m.
The owners are confident that output can be expanded further going forward with the profitably of the mill exceeding all expectations
SLP – A profitable way to cut small to medium size logs.
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