Passion for Timber

CLT

Construcción de madera con enormes ventajas

The production method:

How PFEIFER CLT panels are made

SAWN TIMBER

Softwood is harvested in the forest and processed into panels at Pfeifer’s own sawmill.

DRYING

Softwood panels are first technically dried at a temperature of 55 ° C for 48 hours until they reach a moisture content of roughly 12 %. After that, they are pre-planed.

SORTING

The pre-planed and technically dried panels are then mechanically sorted by strength. If higher surface quality is required, special sorting criteria that go beyond mere strength-related factors are applied for the top element lamellas.

FINGER JOINTING & LAMELLA PLANING

Panel sections that have been found to contain strength-lowering or unpleasant growth deviations such as large branches, pitch pockets or bark inclusions during sorting are eliminated depending on the strength and surface quality class. Thanks to force-fitting finger jointing, the individual panels are joined to theoretically endless lamellas in longitudinal direction. The endless lamellas are then planed to the desired thickness.

BONDING

The lamellas are laid out flat and glued in plies.

PRESSING

The press force is applied by means of hydraulic presses. Pfeifer's press applies its pressure evenly across the entire surface to minimise gaps between the lamellas.

CUTTING

Cutting tasks may be required depending on the job. This can include format cuts, door and window cutouts, rabbets, holes, breakthroughs etc.

COSMETICS + SANDING (IN CASE OF REQUIREMENTS TOWARDS APPEARANCE)

The last stage includes a visual fine-tuning. This is when defects are patched using wood patches. After that the panels with special requirements towards appearance are sanded using a sanding system.