The wood veneers are devided into two major groups: Rotary cut veneer and sliced veneer. Sliced veneer is the most common used veneer in profile wrapping. The complexity of the core material dictates the quality of veneer to be used.
Fleece backed veneer one manufactures, as a fleece is glued on the back of the veneer. The veneer becomes more flexible by the glued on fleece.
The quality of symmetric and asymmetric finger jointed veneer is visible after the lacquering process. In case of a low quality two different pigmentations are visible. It is possible to avoid different pigmentations by using veneer with an aluminium indicator.
Veneer with an aluminium indicator is always in roll form. At the joint between the veneer sheets an aluminium strip is applied. This type of veneer needs to be ordered with a specified sheet lenght within the roll of veneer. The sheet lenght needs to be 1“ longer then the profile it will be applied to allowing some lenght variations in the substrate. The advantage of the aluminium indicator is, that there is no finger joint on the substrate. This is accomplished by using sensors on the machine to pick up the position of the aluminium indicator at the joint. The signal is used to for positioning the substrate to the aluminium indicator in the veneer roll. In the aforementioned way it is guaranteed that the beginning of the veneer sheet is synchronous with the beginning of the substrate.
Different paper types are available for profile wrapping. Paper for profile wrapping is usually constructed like a sandwich. It starts out with the base paper that is also referred to as the backer. The backer is available in different colours and different weights. The second item is a décor paper. The décor paper can be solid colour or with a printed pattern. The décor paper is usually a 30 gram paper. This décor paper is laminated to the base paper. The colour of the finished paper is dependent on the colour of the base paper. These papers can range from 30 grams to 300 grams and more. Most commonly used papers are 60 or 80 gram papers. They can be wrapped around very complex profiles and at the same time they are not as fragile as a 30 gram paper. Paper can be wrapped around sharp edges (with exception of very heavy papers).
Laminates consists of decorative surface papers, which are impregnated with melamine resins and then pressed over Kraft paper core sheets impregnated with phenolic resin. These sheets are then bonded at pressures greater than 200 Kg per square cm at temperatures approaching 150 degrees celsius. Finished sheets are trimmed, and the backs sanded to facilitate bonding. Laminates are more difficult to wrap in comparison with wrapping paper, because papers are more flexible. The variety of laminates ranges from high-pressure to low-pressure to continuous laminates. There is a difference in the way theses laminates are manufactured as well as in the flexibility of the material. Sharp edges are not recommended. For the flooring industry the laminates are coated with aluminium oxide.
In case of profile-wrapping with laminates an extrem long wrapping zone is necessary. The temperature of the laminate must amount to, if corners are to be wrapped, in the appropriate places 300 ° C.
There are many different types of vinyl available. The most commonly used materials are hard / soft PVC and PP. Vinyl can be a solid colour or have a printed pattern. Different topcoats are available for interior or exterior products.
No special requirements.
The vinyl has to be durable against ultraviolet jets . A special vinyl with a wood-similar surface (veneer characteristics) and aluminium similar surface (aluminium characteristics) is available for exterior application, which is mainly used by the plastic window industry.
The newest development is a thermoplastic film for the decorative finishing of windows, doors and other building elements. The film is suitable for climatically difficult regions too, because of a higher weather and temperature stability. Also under difficult conditions the foil is characterised by an outstanding colour and gloss stability. Before the glue application the processing temperature of “Renolit-Fast“ has to be 80 ° C with less tolerance.