OUR WOOD – Every tree grows in its own unique way
Wood and the tones of wood surfaces are an expression of naturalness. To that effect, they have a harmonious effect on people. The utmost care is taken when selecting woods, veneers and wood materials used at Willisau Switzerland.
The individual design, distinct grain and uniqueness of each finish are what create the charm of the object. Our design provides the best possible conditions for expansion and contraction of the wood. However, it is not always possible to completely prevent smaller hairline cracks in the case of solid wood panel, particularly during periods of transition to very high temperature as well as fluctuations in humidity. We therefore recommend keeping the relative humidity above 40% (ideal humidity in the range of 50% – 60%) during the cold and dry winter months. We therefore recommend maintaining a constant humidity and room temperature.
To meet the multitude of requests, we offer our new PREMIUMline+ tables made of one solid piece as well. Because these are natural, one-of-a-kind objects characterized by an extraordinary liveliness that is hard to tame with this type of construction in particular, we would like to bring explicit attention to the fact that wooden tabletops are especially sensitive to temperatures and humidity fluctuations. The lengthwise solid (wood) tabletops respond to these changes by "working", which means that over time smaller offsets and irregularities as well as warping of the tabletop can occur. Various effects from light can change the colour of the wood. We therefore ask that you also expose the tabletop extension panel (table fully extended) to various lighting situations as often as possible, particularly at the beginning. Shrinkage, distortion (swelling, expanding), cupping (warping), minor cracks and/or gap formations and discolouration are natural (caused by nature), comply with the current state-of-the-art and do not constitute grounds for reclamation.
Thickness: +/- 2%
Width: +/- 3%
Length: 1 mm per meter
"Warping/cupping": 1 mm per 10 cm width of panel (considered normal and acceptable)
Wood humidity: A change of 1% results in approx. 0.6% dimensional change. The wood humidity is approx. 7% – 10% at the time production is complete. During the subsequent natural drying process of solid wood, small hairline cracks (particularly around branches) are unavoidable. These stay practically invisible with non-stain treatments, treatment with wood tones or untreated products. However, these cracks may become visible under opaque surface treatments. Unfortunately this is unavoidable.
The structure of the wood (grain) in solid wood tables from the panel to the leaf (extension) is not continuous, due to the immense length of the logs that would be required!
Solid wood: oil or varnish?
"Back to nature" – A trend that has long since found a place in the furniture industry as well. The number of natural finish products is increasing all the time, but what options do customers have to choose from?
Varnished surfaces are treated with a rugged polyurethane lacquer, giving life to the structure of the wood and offering a partially close-pored finish. The varnish hardens the surface and protects it, for the most part, against spots of all types. In addition, the surface is resistant to acids and highly resistant to alcohol.
Solid wood is easy to take care of, no special care necessary. The surface can be cleaned and maintained with warm water and a bit of washing-up liquid if necessary. In general, "less is more"! Make sure not to use any abrasive agents (such as Vif etc.). Ideally you should use a clean, damp cotton or microfiber cloth. Then dry off the surface using a soft, dry cloth.
Varnishes have a UV protective property that delays discolouration caused by sunlight. They are also a durable protection against water, alcohol and solvents.
Repairs can only be performed by a professional.
Our oiled finishes are treated with solvent-free, purely organic special natural oil, free of any synthetic additives. It gives life to the natural beauty and structure of the wood, giving the finish an open-pored and slightly silky shine. The oil penetrates the wood and protects it from the inside. This results in an oiled surface that is antibacterial and antistatic. Thus it has excellent properties: it complies with EN 71 Part 3 (Children’s toy surfaces) and is food-compatible.
Solid wood has a natural finish. The oil creates a moisture-repellent finish. Depending on the condition of the surface, the protection against acids and alcohol can be guaranteed for a period ranging from several minutes to several hours. Because the oil penetrates the wood, the wood surface actually feels like pure, natural wood, promoting a colour of the solid wood that is rich in contrast.
The finish can also be cleaned using lukewarm water. No additives such as washing-up liquid are necessary. Ideally you should use a clean dry or lightly dampened cotton cloth. Spilled liquids must be wiped up immediately using a clean, dry cloth or paper towel.
Never use scouring agents, detergents or furniture polishes for cleaning purposes.
You can repair minor damages to the panel yourself. It is possible to repair scratches, small marks and spots.
Procedure for smaller scratches or permanent stains (e.g. indelible ink felt-tipped pen or similar):
Use the Scotch (1) from the Willisau care set. Apply a small amount of oil (2) and rub the table in the direction of the grain (3). Next, immediately use the cotton towel (4) included with the set to wipe away the oil that has not penetrated the pores. Never use micro-fibre or leather towels for this.
Procedure for repairing heavier signs of use:
Sand down the table using 220-grain sandpaper in the direction of the grain. Wash off the dust using a damp cloth and let the table dry overnight. Next use Scotch to perform an additional fine sanding in the direction of the grain. Then use a cotton towel to apply oil to the raw surface. Finally, wipe away the oil that has not penetrated into the pores.
The table has to be oiled at regular intervals (frequency of oiling depends on use of the wood surface, normally approx. 1-2 times per year). Please use the care set (oil) included with the delivery and make sure that you follow the instructions for care of oiled tables from Willisau Switzerland.
Both methods of treatment have advantages and disadvantages that must be taken into consideration based on the owner's needs. For customers who want a care-free table, we always recommend a varnished product. Oiled products are for customers who appreciate the natural appearance of the finish as well as the possibility to perform small repairs themselves.