At the KLH factory, planks of kiln-dried, finger-jointed spruce
are sorted and cut into sheets of up to 16.5m by 2.95m. These
sheets are then stacked and glued under high pressure in
perpendicular layers. Depending on the purpose and static
requirement, the panels are available in 3, 5, 7 or more board
layers. The panels can be supplied with three different
grades of top layer - non-visual, industrial grade visual, and
domestic grade visual.
The process we use to manufacture engineered
cross-laminated timber panels involves a number of innovations that
set the product apart - the most notable of which is a
high-pressure bonding system which allows the use of polyurethane
adhesive in the boards. This solvent-free and
formaldehyde-free adhesive ('o' emission class) is able to
achieve a very high quality level of adhesion, with no risk of
toxic emissions at any stage in the product's life cycle.
This process has been tested in accordance with DIN 68141 and other
strict criteria by MPA Stuttgart and approved for the production of
load-bearing timber construction elements and special construction
methods in accordance with DIN 1052 and EN 301. Crosswise gluing at
high pressure reduces the wood's expansion and shrinkage to an
The panels are cut and processed using CNC technologies,
resulting in excellent dimensional stability, both in overall panel
size and for structural openings.
The panels are tested in accordance with the product's European
Technical Approval. Two cores are taken from batch of panels
and these are subsequently tested to extremes of climactic
conditions (oven baking and boiling in water- simulated lifespan of
up to 80 years); and for strength/ structural properties
(shear testing and crushing).
KLH UK - Technical Information - Build Up of a 3-Layer Panel (pdf file. 833kb)
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