Modern adhesive systems for perfect surfaces!
In modern furniture manufacture, wood-based panels are surface-laminated with the most diverse materials. Apart from resinated decor papers and veneers, of thermoplastic 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 (UF) 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. Actually D2 products are in use - either based on PVAc like Jowacoll® 124.00 or on EVA like Jowacoll® 148.00 - but also reactive dispersions of durability class D3, like for instance Jowacoll® 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, Roller 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 (they have a solid content of 100 %).
The adhesive Jowat-Toptherm® 236.50 is a product which sets new standards with regard to performance and efficiency. As unfilled polyolefin system, Jowat-Toptherm® 236.50 allows application amounts which are optimized. 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 performance factors of this adhesive. Superior results with regard to surface quality are a consequence of the high impact resistance (Shore hardness) of the adhesive. The product is also convincing 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. The highest strength and impact resistance levels, for instance for kitchen and bathroom cabinets, can be achieved with moisture-resistant polyurethane hot melt adhesives of the Jowatherm-Reaktant® family. Especially 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 are convincing due to their low processing temperatures, an excellent adhesion to difficult substrates and their superior long-term durability.