In modern furniture manufacture, wood-based panels are surface-laminted with the most diverse materials. Apart from resinated decor papers and veneers, of thermoplasic foils, CPL and HPL are frequently used. These materials are bonded using a variety of technologies which demand specific optimised adhesive solutions.
For years, the state of technology was processing with Urea Formaldehyde adhesives. These are, however, viewed with growing reserve, due to current aspects of health and ecology. Innovative Jowat adhesive systems on dispersion or hot melt bases are the efficient alternatives.
When the surfaces are decor foils, CPL, HPL or veneer, a number of dispersions have become established which are tailored for the respective processes. D2 products are in use, either based on PVAc like Jowacoil 124.00 or on EVA like Jowacoil 103.10.
Usually, the adhesive is applied by roller onto the base materials and pressing can be carried out subsequently with cold, but also with hot pressing methods, rfoller laminators are often used in throughfeed lines and stationary pressing times are not necessary.
In veneering operations, special settings can minimize a penetration of the glue, and the risk of discolourations can also be successfully reduced or eliminated by adjusting the pH value of the dispersion.
In flat lamination, a crucial factor for quality is a smooth and even surface appearance. Any slight or more pronounced surface swelling of the wood-based substrate is prevented when using hot melt adhesives, as they have a solid content of 100%.
The adhesive Jowat-Toptherm 236.50 is a product which sets new standards with regards to performance and efficiency. As unfilled polyolefin system, Jowat-Toptherm 236.50 allows application amounts which are optimised. The most important factor for a visually appealing and smooth surface that is at the same time resistant, is a thin, hard bondline.
Highest surface quality and low VOC emissions are outstanding performace factors of this adhesive. Superior results with regards to surface quality are a consequence of the high impact resistance of the adhesive. The product also works well when temperatures are higher, and possible defects caused during panel stacking in the factory is efficiently prevented.
Flat lamination with decor foils is a process for which the conventional EVA hot melt adhesives like Jowatherm 293.50 have become widely accepted. High strength and impact resistance levels, for instance for kitchen and bathroom cabinets, can be achieved with moisture-resistant polyutherane hot melt adhesives of the Jowatherm-Reaktant family.
Espcially for modern high gloss plastic surfaces based on thermoplastic foils, products like Jowatherm-Reaktant 609.40 are the products of choice. The PUR hot melt adhesives work effectively due to their low processing temperatures, great adhesion to difficult substrates and their superior long-term durability.