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Building Materials - Engineering

Q1:

Plywood is obtained by gluing wooden sheets at

A 100 to 150 N/cm2

B 100 to 130°C

C both (a) and (b)

D Neither (a) nor (b).

ANS:C - both (a) and (b)

Glued sheets are loaded into a multiple-opening hot press. presses can handle 20-40 sheets at a time, with each sheet loaded in a separate slot.

When all the sheets are loaded, the press squeezes them together under a pressure of about 110-200 psi (7.6-13.8 bar), while at the same time heating them to a temperature of about 230-315° F (109.9-157.2° C).