This is for the PG students of Wood Science&Technology,Kannur University

1. SAWMILL OPERATIONSAWMILL OPERATION
Dr.E.SREENIVASANDr.E.SREENIVASAN
Technical Manager, R&DTechnical Manager, R&D
THE WESTERN INDIA PLYWOODS LTDTHE WESTERN INDIA PLYWOODS LTD
BALIAPATAM,BALIAPATAM,
KANNUR-670010KANNUR-670010
Ph:8289865990Ph:8289865990
E-Mail: dr.sreeniettammal@gmail.comE-Mail: dr.sreeniettammal@gmail.com

2. AIMSAIMS
 To know the way of sawn timber production,To know the way of sawn timber production,
the carried out operations,the carried out operations,
 their aim and way of realization, processingtheir aim and way of realization, processing
machines, mechanization.machines, mechanization.
 To know the sawn timber assortment, itsTo know the sawn timber assortment, its
properties, usage.properties, usage.

3. INTRODUCTIONINTRODUCTION
 Timber production represents one of the firstTimber production represents one of the first
manufacturing industries in India, Europe and Americamanufacturing industries in India, Europe and America
 Early people cleared the forest cover from land for theEarly people cleared the forest cover from land for the
purpose of cultivation and they required the wood forpurpose of cultivation and they required the wood for
themselves, for their business, construction, etc.themselves, for their business, construction, etc.
 First sawmill was established in America as early asFirst sawmill was established in America as early as
1608 for sawing pinewood. As the timber industry1608 for sawing pinewood. As the timber industry
developed it moved to Canada, Europe and finallydeveloped it moved to Canada, Europe and finally
India.India.

4. SAWMILLSAWMILL
 Its structure, production parts.Its structure, production parts.
 Round timber, its reception, storage, protectionRound timber, its reception, storage, protection
on the sawmill yards.on the sawmill yards.

5. LOG YARDLOG YARD
 Operations in the log yard -- measuring,Operations in the log yard -- measuring,
bucking, debarking, buttress reduction, metalbucking, debarking, buttress reduction, metal
detection, sorting.detection, sorting.
 The aims of the operations, ways of realizationThe aims of the operations, ways of realization

6. SAWINGSAWING
 Log sawing -- ways, properties, usage.Log sawing -- ways, properties, usage.
 Sawn timber yield.Sawn timber yield.
 Sawing diagrams, its designing. Influences onSawing diagrams, its designing. Influences on
the yield.the yield.
 Major processing functions:Major processing functions:
a) Breakdowna) Breakdown
b) Rippingb) Ripping
c) Cross cuttingc) Cross cutting

7. SawingSawing

8. SawingSawing

9. BREAKDOWNBREAKDOWN
 To convert round logs into timber it is necessaryTo convert round logs into timber it is necessary
to first reduce the log to slabs, planks orto first reduce the log to slabs, planks or
scantlings. This is breakdown.scantlings. This is breakdown.
 Types of Log breakdown equipment:Types of Log breakdown equipment:
1.Band saw1.Band saw
2.Circular saw2.Circular saw

10. RIPPINGRIPPING
 Its function: Removal of any wane or bark edgesIts function: Removal of any wane or bark edges
and dimensioning of the board or plank to widthand dimensioning of the board or plank to width
 It is done with resaws, in small mills. ResawsIt is done with resaws, in small mills. Resaws
may be of either a single saw or circular saws butmay be of either a single saw or circular saws but
most frequently they use band sawsmost frequently they use band saws
 Gang edger is used in large millsGang edger is used in large mills

11. CROSS CUTTINGCROSS CUTTING
 Cross-cutting, edging, sorting of sawnCross-cutting, edging, sorting of sawn
timber.timber.
 Machine equipment of the places, principlesMachine equipment of the places, principles
of the operation realizations.of the operation realizations.
 Layout of the sawmills, operation order.Layout of the sawmills, operation order.

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

13. CARE NEEDED IN OPERATIONCARE NEEDED IN OPERATION
 The blades should always be sharp and the teethThe blades should always be sharp and the teeth
should be uniform, for maximum outputshould be uniform, for maximum output
 In all the saws, alternate teeth should be set inIn all the saws, alternate teeth should be set in
opposite direction leaving the middle oneopposite direction leaving the middle one
straight. This is for easy movement of sawduststraight. This is for easy movement of sawdust
from the log while sawingfrom the log while sawing

14. SAWMILL PRODUCTSSAWMILL PRODUCTS
 Assortment of the sawmill products -- types,Assortment of the sawmill products -- types,
dimensions, qualities.dimensions, qualities.
 Dimension and quality sorting of the sawnDimension and quality sorting of the sawn
timber.timber.

15. SAWN TIMBER YARDSSAWN TIMBER YARDS
 The aims and ways of sawn timber storage.The aims and ways of sawn timber storage.
 Layout of the sawn timber yards, usedLayout of the sawn timber yards, used
mechanization devices.mechanization devices.
 Organization of production in the sawn timberOrganization of production in the sawn timber
yardsyards

16. THANK YOUTHANK YOU