Thanks to its striking grain, larch wood is popular for windows, exterior doors, and façade cladding. However, many manufacturers have had negative experiences with sagging, and cracking of the coatingfilm during application. There are two main reasons for this: On the one hand, the abrupt change between early and latewood leads to significant differences in density. This can lead to adhesion issues, with the result being a 'rippled' surface with air bubbles, wrinkles or cracks in the paint film.
Another complication is water-soluble, phenolic substances in larchwood. In connection with the low pH value of the wood (about 4) they have a negative effect on the thickener system of the paint, and affect its stability. The paint film can break on vertical surfaces, and sagging occurs.
The only option to tackle such complications reliably is to use a special primer. Teknos offers the aqueous 2K special primer ANTI STAIN AQUA 5300 in its product range. It blocks critical substances in the larchwood, and balances out structural differences in the wood. The primer is applied before the topcoat to ensure a smooth, even surface despite varying wood quality.
New research findings provide interesting approaches for the future. The 'LarchCoat' project by Holzforschung Austria (Austrian Wood Research Institute) has shown that the high concentration of polysaccharide Arabinogalactan in the larch heartwood has a negative effect on film formation. Teknos are using these findings in the development of future water borne 1K larch wood primers. Currently, however, the 2K primer ANTI STAIN AQUA 5300 is the method of choice for coating larch wood reliably in water borne system.
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Traditionally made sash windows are as typical for the British window market as is the early adoption of Accoya. Two examples show that Teknos UK is successful in both fields.
Dougall Flooring Ltd. based in Kingston (Jamaica) builds windows and doors for dream villas along the Caribbean coast and relies on coatings from Teknos.
Windows installed in building shells, stylish facades, designed building components treated with fire-retardant coating - Teknos Drywood has a lot to offer customers, and not only in the Netherlands.
Klas1-Yhtiöt Oy is all set to ride the trend in the windows business. The company's windows come with a range of structural and technical solutions while not overlooking aesthetic values.
Sachsenfenster GmbH & Co. KG in Rammenau near Dresden has successfully relied on Teknos coating systems for over 20 years.
The innovative House of Logistics and Mobility (HOLM) at Frankfurt Airport was made with wood/aluminum windows from Unilux - coated with Teknos.
Leksandsdörren produces around 11,000 doors per year and has sales of around SEK 72 million (just under EUR 8 million). The company primarily supplies the domestic market and distributes its products through building parts dealers and building contractors.