Production

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1. Drying of the boards

Softwood- boards are dried down to a moisture content of approx. 12 % and then planed.

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2. Strength-grading

The planed dried boards are strength-graded mechanically. For the outer lamellas of the glulam additional requirements concerning the outward-appearance of the glulam are taken into account.

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3.Cutting off knots and other wood-defects

Board sections with wood-defects having significant influence on the strength or the outward appearance such as knots, resin- or bark-pockets are cut out off the boards dependent on the strength class and the surface-class. The boards are jointed together lengthwise to a theoretically infinite lamella using fingerjoints (glued connection between the edges of two boards which have a shape similar to a hand).

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4. Finger-jointing

Finger joints are made on automated finger joint machines. The ends of two plates to be connected are provided with mutually matching prongs (milled) and glued together under pressing power. In this way, through joining together of many individual parts, plate strands as long as necessary can be prepared in a short time.

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5. Planing of the lamellas

After the fingerjoints have been hardened the lamellas are planed to thicknesses of up to 45mm.

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6. Gluing

The glue is applied on the broader edge of the lamella.

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7. Pressing of the lamellae

At least three lamellas are stacked and pressed in an either straight or curved press.

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8. Planing of the glulam

After the gluelines are hardened the raw glulam is usually planed and chamfered.

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9. Factory assembly and further detailing

In most cases the glulam members are cut to their final size and joints are fixed in the plant. If necessary the members are given preservative treatment or temporary coating against the influence of direct weathering during construction and the members are wrapped with packing material.

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10. Assembly

Now the transport to site can take place. Clean and dry storage on site belongs to the basic rules of timber construction. Rapid construction progress and quick closing of building shells protect from excessive moisture absorption.

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