What is the main purpose of this code?

To provide a standard procedure for determining if a species of timber is suitable for making plywood, and to classify its properties for this purpose (Clause 1).

What is a key test performed on the final plywood sample?

The glue shear strength test is a critical evaluation of the adhesive bond quality, performed as per IS 1734 (Clause 6.2).

Does this code specify the final grade of the plywood?

No, it provides the testing method to generate data on the timber's suitability. Final plywood grading is done according to other standards like IS 303 (General Purpose) or IS 710 (Marine).

What characteristics are observed during veneer peeling?

Key observations include smoothness of veneer surface, tightness (presence of splits), colour, and any processing difficulties (Clause 4.3).

IS 12077

: 1987

Code of practice for testing of timbers for plywood manufacture

CurrentSpecializedTesting MethodMaterials Science · Wood and Other Lignocellulosic Products

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This standard outlines the code of practice for testing and evaluating the suitability of different timber species for plywood manufacturing. It covers the entire process from log selection, peeling, veneer drying, and gluing to the final testing of the produced plywood panels to determine their properties and grade.

Code of practice for testing of timbers for plywood manufacture

Quick Reference Values

Typical Veneer Thickness for Testing1.5 mm

Typical Veneer Moisture Content before Gluing6 - 12 %

Typical Hot Press Temperature140 - 150 °C

Typical Hot Press Specific Pressure1.4 - 1.7 N/mm²

Practical Notes

The primary goal is to assess a timber species' behavior during peeling (smoothness, splitting), drying (shrinkage, warping), and gluing, not just the final strength.

Results from this code are used to classify a new timber species' suitability against known species used in the plywood industry.

Proper log conditioning (heating in water) as per Clause 3.3 is critical for obtaining good quality veneer and directly impacts the test outcome.