Instruction and Maintenance of Veneers

JOINTING TECHNIQUES

VENEERING

Veneer can be glued onto all wood-based supports with ureic or vinyl glues. For gluing onto supports in different materials we recommend first carrying out tests to check for any technical problems and assess the performance of the finished product.

GLUING WITH UREIC GLUES

When using ureic glues it is generally advisable to avoid applying more than 150 g/m2,at pressures varying from 1.5 bar to 3 bar and veneering temperatures between 80° C and 125° C. Additives may be added to the glue in order to

adjust its rheological properties and avoid undesirable seepage. We also suggest pigmenting the glue with shades

similar to the veneer colour.

GLUING WITH VINYL GLUES

Due to the thermoplastic characteristics of this type of glue, the amount to be applied must be accurately regulated according to the veneer, the support and the kind of press used, in order to avoid unpleasant seepage that is difficult to remove during the sanding operation. Generally speaking, the quantity of vinyl glue used should be between 80 g/m2 and 110 g/m2, at pressures varying from 1.5 bar to 3.5 bar and veneering temperatures between 60°C and 80° C.

SANDING

To remove from the product any traces of manipulation and/or glue left over from the gluing operation, the veneer should be sanded with grade 100/150/180 sandpaper, used singly or in succession on manual or automatic sanders. Sanding carried out at right-angles to the grain, if done forcefully, may leave on the material visible micro scratches or tears; it is necessary therefore, to perform tests beforehand in order to assess the result and decide which specific sanding techniques to adopt.

VARNISHING

veneer may be varnished using the methods and classes of products recommended for varnishing natural wood, which are designed to preserve the material from phenomena of chemical/physical (photodegradation, thermal degradation) and mechanical (scrapes, blows, etc.) deterioration. It is advisable, in any case, to follow carefully the specific instructions provided by the varnish manufacturer, and to carry out tests before subjecting the multilaminar veneer to varnishing processes.

MAINTENANCE OF VENEERS

As veneer is composed mainly of natural wood its moisture content may vary in relation to the environment in which it is stored and worked; we recommend,therefore, maintaining in the areas reserved for storing and working the veneer a humidity rate of between 50% and 80% (Ur) at a reference temperature of 20-22° C. Avoid all contact, even temporary, with water or other liquids, condensation and dripping onto the surface of the product.The product should be stored flat at a height of at least 200-250mm from the floor and the veneer must be protected from all light, both direct and indirect.