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Understanding Plywood

Plywood is a composite product made from sheets of veneer are glued together with an array of intersecting perpendicular. Plywood included in one class of structural panel, in which direction is the use of plywood for structural panels. Plywood or so-called plywood (plywood to plywood with 3 layers, and multiplex to plywood with 5 layers or more), according to the definition of the experts are as follows:
 Plywood is a product obtained by arranging intersect perpendicularly intersect veneer sheets bonded with an adhesive, at least 3 (three) layers (ISO, 1992).
 Tsoumis (1991) suggested that, plywood is a product panels made with glue or glue a sheet of veneer sheets vini on sawn timber, where the sawn timber as part of the core / core (better known as wood core plywood). The fiber direction on the sheet of veneer to face and coreadalah perpendicular to each other, while between the sheets of veneer to face each other in parallel.
 Youngquist (1999) suggested that the plywood is a flat panel composed of sheets of veneer to be held together by a binder (adhesive) under conditions of compression.
 Haygreen and Bowyer (1993) suggested that the plywood is a product-veneer wood veneer panels are bonded together so that the fiber direction perpendicular vinirnya number and the other sejejar the long axis of the panels.

Sections plywood
In general, materials plywood / plywood adalahsebagai following:

a) Face Veneer
 a minimum diameter of 45 cm
 Logs should be straight, spherical and cylindrical
 Wood should be fresh
There is no defect  wood
 There are no knots unhealthy

b) Core Veneer
 a minimum diameter of 45 cm
 Log of at least 85% cylindrical
 Admission to the part that is not bent origin parabola
 Wood should be fresh
 Allow any defects such as knots healthy wood, weathered liver (diameter less than 1/3 the diameter bontos)

c) a back layer
 Quality of veneer for the back layer is not as good of a designated face veneer layer. Examples of wood that can be used as raw material for plywood, among others, meranti, camphor, mersawa, mengkulang, gerunggang, mahogany, agathis, tamarind, sengon, Mindi and forth. .Diameter Log used suggested above 30 cm, but this time the machines are more modern can process logs with a smaller diameter.

For purposes as a coating (fancy-plywood) types of wood that can be used a little differently, because it prioritizes decorative nature. For this purpose, the type of wood that can be used is of a type of wood is expensive and has a nice grain direction (decorative). For example wood, among others: teak, rosewood, ebony, varnish, nail, nyatoh, and so on. In the process, various materials can be used as a coating for example PVC, metal, Formica or paper.

d) Benefits / Uses Plywood
a) Construction of buildings
 Paneling: room divider, door, window
 Coating materials
 Floor
 Sidding: wall
 Plyform
b) Construction means of transportation
 Aircraft: coating the inner wall
 Train: roofs, floors, walls
 Truck and trailer: body

e) Classification of plywood
Based on its use, plywood grouped into two: the interior and exterior plywood. Youngquis (1999) grouping of plywood into two parts:
 construction and industrial plywood
 hardwood plywood and decorative.

Based on the type of adhesive used, the grouping of plywood can be divided into two (Iswanto, 2008):
 Plywood plywood interior is its use indoors or in other words, is not directly exposed to outdoor environmental conditions, the adhesive used is an interior adhesive such as UF, MF and MUF.
 plywood exterior plywood is its use in outdoor directly exposed to outdoor conditions, the adhesive used is an adhesive exteriors such as PF.
Based finir face, plywood grouped into:
 Ordinary plywood is plywood which faces finir generated from rotary cutting process.
 Fancy plywood is plywood where finir face made of beautiful wood and produced from the process of cutting or half slice rotary cutting.