Circular Saw Not used as headrig in softwood sawmills

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Presentation transcript:

Circular Saw Not used as headrig in softwood sawmills Less throughput than band saw Blades rigid, saw kerf is 1/4” to 3/8” Relatively wide saw kerf – high waste factor

Circular saw

Waste Factor Comparison Band Saw Circular saw

Sawmill – generic overview Log yard Bucking Headrig Debarker Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

Gang Sawing cant gang saw blades

Gang saws Fixed, oscillating blades Little flexibility Intermediate kerf Single pass High throughput

Gang saws

Log breakdown patterns 1. live sawing 2. cant sawing 3. sawing for grade 4 & 5. sawing for edge grain 6. dimension lumber

Optimization software

Scanning of the log to optimize the yield Bottom profile Mid-length profile Top profile Product mix selected

Sawmill optimization (Halco Software Systems)

Sawmill – generic overview Log yard Bucking Headrig Debarker Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

Wane http://www.wdscapps.caf.wvu.edu/lumberrtk/ http://www.decks.com/article197.aspx

6. Edger The edger will rip the rough sawn board to width and remove the wane and other defects. Uses circular saws. wane wane saw cuts

Edger optimizer

Sawmill – generic overview Log yard Bucking Headrig Debarker Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

7. Lumber Grading - Trimming

Lumber Grading Different grades systems for hardwoods and softwoods Different grades depend mainly on natural defects size, number and location of knots size, location and type of stain or rot amount of wane machine defects skip snipe

Trimming The trim saw is used to cut the boards to length Lumber is trimmed to lengths of 2 foot multiples. Uses circular saws.

Trimming

Multi-saw trimmer

Sawmill – generic overview Log yard Bucking Headrig Debarker Cants Side boards Gang Saw Trimmer Edger Sorter, Stacker

The “Green Chain”

Descrambler

J-bar sorting The lumber is scanned and sorted into bins depending on species, grade, dimensions

Multiple sort bins

Stacking

Drying kilns

Reasons for drying lumber Increase strength of lumber Reduces later dimensional changes Increases decay/insect resistance Decreases weight of lumber

Drying Drying factors Temperature Relative humidity Air circulation Sticker Lumber Drying factors Temperature Relative humidity Air circulation

Planermill Planermill Kilns Sawmill Logyard

Planer

Planer

Planer 4 knifes per planer head 24 knifes per planer head

Waste Management Trim ends Chips Sawdust Planer shavings Bark Hog fuel