IMPORTANT NOTE

This web page is part of a web site that is no longer actively maintained by anybody at ANU SRES. It has been left on the web due to its apparent popularity (every time we've removed it, people have complained within 24 hours), but is presented AS IS - attempting to contact any individual named on the page is likely to fail, and the SRES webmaster doesn't want to hear about such failures or entertain any communication about updating of the page's contents. You have been warned.

PLYWOOD & VENEER PRODUCTION



This document is a student production providing detailed information on plywood and veneer production for the Forest Products unit, Department of Forestry, Australian National University.

Constructed by Robert M. Young - BSc. (Forestry)


CONTENTS

Veneer Production


Plywood Manufacture


Australian Companies



Introduction

Veneer and plywood have a long Australian history in converting forest resources into value added products. Plywood is in fact a value added product of veneer.

The veneer manufacturing process ( see flow chart) , cuts the log into peelable lengths, removes the bark, and places the veneer bolt into the lathe. The lathe carriage moves forward as the spindles rotate the bolt. As the full length veneer knife slices through the wood fibre, the spinning bolt becomes a veneer ribbon. The veneer ribbon is transported downstream, clipped into selected widths, and sorted onto loads by width and moisture content. The veneer is then dried to a predetermined moisture content, usually 3-6%. The drying process stabilises the veneer dimension, strengthens the fibres, and prepares the wood for gluing. The veneer is next sorted by width and grade, and taped or spliced if the layons need repair. The veneer is then ready for panel laying. The veneers are then prepared for gluing and pressed into plywood panels. After pressing the plywood is conditioned and finished and packed for shipment.


Veneer

Veneering is a highly popular way of utilising the natural qualities of wood which utilises nearly the whole log. The conversion process from log to veneer boast a recovery rate of up to 95%. Which is unheard of in conventional softwood and hardwood sawmills. Wood veneer is a thin 0.3 to 6 mm sheet of wood having its grain parallel to the surface. The sheet or layon is peeled from a selected log by using either a lathe or slicer. The following factors determine the quality and end use of veneers produced.


Plywood

The plywood manufacturing process is unique, as a raw material is manufactured into a product that is stronger or as strong as the original tree (Baldwin 1981). It is manufactured by gluing together one or more veneers to both sides of a veneer or solid wood core. The grain of alternate layers is crossed, generally at right angles, and the species, thickness and grain direction of each layer are matched with those of their opposite number on the other side of the core.

To describe a veneer core plywood completely, it is required to indicate three constitutes.

The manufacture of plywood can be divided into two main stages

Plywood also claims a high versatility of end uses. its relatively simple to manufacture and has many advantages over other wood converted products as well as some steel and sheet metal applications.


References and Bibliography

Australias Parliment. Senate. Standing.Committee on Trade and Commerce, (1981). Australia's Forestry and Forest Products Industries: Report by the Senate Standing Comitte on Trade and Commerce. Australiajn Goverment Publishing Service, Canberra.

Australian Products Industries Advisory Council, (1980). Australia's Forest Products Industries: a report by the Forest Products Industries Advisory Council. Australiajn Goverment Publishing Service, Canberra.

Baldwin.R.F., (1981). Plywood Manufacturing Practices Revised 2nd Edition. Miller and Freeman Publication Inc. USA.

Boas. I.H., (1947). The Commercial Timbers of Australia: their Properties and Uses. Australiajn Goverment Publishing Service, Melbourne.

Evans, P. D, (1996) Wood Conversion and Utilisation Lecture Notes. Australian National University.

Gunns Veneers. Sustainable regrowth Crown Cut Veneer Information Sheet and Users Guide.

International Consultation on Plywood and Other Wood-Based Panel Products, (1963). Plywood and Other Wood Based Panels. Food and Agriculture Oranization of the United Nations, Rome.

UCNW (1978). University College of North Wales course material, unpublished.


Other useful links


Top of Page

To return to Forest Products Technology

To return to ANU Forestry Homepage

To return to ANU Homepage


phone +61 6 2494412 ... fax +61 6 2490746

Department of Forestry
Australian National University
Canberra ACT 0200
AUSTRALIA

This document is edited by Mr. Peter Beutel. All enquiries should be posted to the above address or sent by e-mail to Peter.Beutel@anu.edu.au


Important Copyright Notice ©

Please note: the following pages are always under construction and have been designed to be viewed with "Netscape", version 1.1 or higher.

(Download Netscape from ANU SunSITE)

The source of the picture on this sight is unknown.
Established August 1996
Last update: 22 October 1996
URL: http://online.anu.edu.au/Forestry/veneer.html