SAWMILL OPERATIONSAWMILL OPERATION

Dr.E.SREENIVASANDr.E.SREENIVASANTechnical Manager, R&DTechnical Manager, R&D

THE WESTERN INDIA PLYWOODS THE WESTERN INDIA PLYWOODS LTDLTD

BALIAPATAM,BALIAPATAM,KANNUR-670010KANNUR-670010Ph:8289865990Ph:8289865990

E-Mail: E-Mail: dr.sreeniettammal@gmail.comdr.sreeniettammal@gmail.com

AIMSAIMS To know the way of sawn timber To know the way of sawn timber

production, production, the carried out operations, the carried out operations, their aim and way of realization, their aim and way of realization,

processing machines, processing machines, mechanization. mechanization.

To know the sawn timber To know the sawn timber assortment, its properties, usage.assortment, its properties, usage.

INTRODUCTIONINTRODUCTION Timber production represents one of the first Timber production represents one of the first

manufacturing industries in India, Europe and manufacturing industries in India, Europe and AmericaAmerica

Early people cleared the forest cover from Early people cleared the forest cover from land for the purpose of cultivation and they land for the purpose of cultivation and they required the wood for themselves, for their required the wood for themselves, for their business, construction, etc.business, construction, etc.

First sawmill was established in America as First sawmill was established in America as early as 1608 for sawing pinewood. As the early as 1608 for sawing pinewood. As the timber industry developed it moved to Canada, timber industry developed it moved to Canada, Europe and finally India.Europe and finally India.

SAWMILLSAWMILL Its structure, production parts. Its structure, production parts. Round timber, its reception, storage, Round timber, its reception, storage,

protection on the sawmill yards. protection on the sawmill yards.

LOG YARDLOG YARD Operations in the log yard -- Operations in the log yard --

measuring, bucking, debarking, measuring, bucking, debarking, buttress reduction, metal detection, buttress reduction, metal detection, sorting. sorting.

The aims of the operations, ways of The aims of the operations, ways of realization realization

SAWINGSAWING Log sawing -- ways, properties, usage. Log sawing -- ways, properties, usage. Sawn timber yield. Sawn timber yield. Sawing diagrams, its designing. Sawing diagrams, its designing.

Influences on the yield. Influences on the yield. Major processing functions: Major processing functions: a) Breakdown a) Breakdown b) Ripping b) Ripping c) Cross cuttingc) Cross cutting

SawingSawing

SawingSawing

BREAKDOWNBREAKDOWN To convert round logs into timber it To convert round logs into timber it

is necessary to first reduce the log to is necessary to first reduce the log to slabs, planks or scantlings. This is slabs, planks or scantlings. This is breakdown.breakdown.

Types of Log breakdown equipment:Types of Log breakdown equipment: 1.Band saw1.Band saw 2.Circular saw2.Circular saw

RIPPINGRIPPING Its function: Removal of any wane or Its function: Removal of any wane or

bark edges and dimensioning of the bark edges and dimensioning of the board or plank to widthboard or plank to width

It is done with resaws, in small mills. It is done with resaws, in small mills. Resaws may be of either a single Resaws may be of either a single saw or circular saws but most saw or circular saws but most frequently they use band sawsfrequently they use band saws

Gang edger is used in large millsGang edger is used in large mills

CROSS CUTTINGCROSS CUTTING Cross-cutting, edging, sorting of Cross-cutting, edging, sorting of

sawn timber. sawn timber. Machine equipment of the Machine equipment of the

places, principles of the places, principles of the operation realizations. operation realizations.

Layout of the sawmills, operation Layout of the sawmills, operation order. order.

WASTEWASTE TypesTypes Origin& volumeOrigin& volume Ways of processing Ways of processing StorageStorage Usage. Usage.

CARE NEEDED IN CARE NEEDED IN OPERATIONOPERATION

The blades should always be sharp The blades should always be sharp and the teeth should be uniform, for and the teeth should be uniform, for maximum outputmaximum output

In all the saws, alternate teeth In all the saws, alternate teeth should be set in opposite direction should be set in opposite direction leaving the middle one straight. This leaving the middle one straight. This is for easy movement of sawdust is for easy movement of sawdust from the log while sawingfrom the log while sawing

SAWMILL PRODUCTSSAWMILL PRODUCTS Assortment of the sawmill products Assortment of the sawmill products

-- types, dimensions, qualities. -- types, dimensions, qualities. Dimension and quality sorting of the Dimension and quality sorting of the

sawn timber. sawn timber.

SAWN TIMBER YARDSSAWN TIMBER YARDS The aims and ways of sawn timber The aims and ways of sawn timber

storage. storage. Layout of the sawn timber yards, Layout of the sawn timber yards,

used mechanization devices.used mechanization devices. Organization of production in the Organization of production in the

sawn timber yards sawn timber yards

THANK YOUTHANK YOU