EWPAA Structural Plywood and LVL Design Manual - Engineered ...

After drying, the veneer is sorted into grades ready for lay-upVeneer passing through the rollers of a glue spreaderPressingThe assembled veneer lay ups are then cold pressedto facilitate the bonding process and ensure goodadhesive transfer from the spread to the unspreadveneers.After cold pressing, the plywood or LVL is hotpressed for a set time between heated platens at aset temperature and time to achieve proper bonding.Typically plywood hot presses are suitable for maximumplywood sheet sizes of 2700 x 1200 mm and havemultiple layers of platens so that 8 to 45 sheets ofplywood are pressed in each press load.Plywood panels exiting 15 daylight (15 layers ofplatens) hot pressStructural LVL fabricated in a dedicated LVL hotpress, is laid up on a moveable conveyor belt andprogressively hot pressed in a single layer press,such that very long, continuous lengths are achieved.Typically, LVL hot presses are 600 to 1200 mm in width,permitting production of beam or column elements of1200 mm depths by lengths in excess of 24 metres andin thicknesses ranging from 35 to 75 mm.Structural LVL manufactured in a plywood hot press willbe 2700 mm in length maximum.LVL production line4