Wood & Panel

Kleiberit enlightens on PUR hotmelt advantages for surface lamination

 Tuesday, November 3, 2020

Surface lamination is a proven method in various branches of industry. Plastic films, decorative papers or even HPL and CPL are glued to the surfaces of various material panels.

The lamination of wood-based panels from MDF or chipboard is typical. These are processed in the wood processing industry by furniture manufacturers and furniture suppliers. Furthermore, lightweight panels (sandwich elements) made of plastics or aluminum are laminated. Lightweight panels are also used in the furniture industry, but are also used in many other branches of industry, such as automobile construction or shipbuilding and boat construction.

Decorative papers consist of plastics, natural fibers and lacquer systems and exist in different embossings, designs and quality levels. Nowadays there is a huge selection of laminated panels that are further processed as furniture elements or floors.

The adhesive as a composite material between the decor and carrier material plays an extremely important role in the quality of the surface lamination. For example, pieces of furniture in the kitchen or bathroom are exposed to high loads due to increased heat and moisture. Floors have to withstand mechanical forces for years. The right choice of adhesive has a decisive effect on the quality and longevity of the lamination. Reactive polyurethane adhesives have revolutionized surface lamination and opened up a multitude of new possibilities.

When it comes to surface lamination, EVA and PVAc adhesives quickly reach their limits.

The advantages of reactive PUR hotmelts are obvious: PVAc and EVA adhesives achieve good results in many areas of application. With regard to surface lamination, these adhesives quickly reach the limits known on the market. PUR adhesives broke these limits and have thus revolutionized surface lamination. Thanks to these adhesive systems, there is an unprecedented variety of combinations of carrier plates and decors. The resilience of the adhesive connection is higher, production processes can be designed more efficiently. This opens the door to new markets for many manufacturers.

PUR adhesives adhere to various materials and enable countless material combinations in surface lamination

EVA and PVAc adhesives contain higher amounts of water. The carrier material must therefore have a certain absorbency, which significantly limits the suitability of these adhesives. Wood-based materials have i. d. R this absorbency, plastics or metals on the other hand not. Reactive PUR adhesives do not contain any water and show excellent adhesion properties on a wide variety of materials. Wood-based materials, mineral materials and plastics can be glued together at the highest level.

Reactive PUR hot melt adhesives (hotmelts) eliminate uneven decors in surface lamination

Aqueous adhesives can swell and cause uneven decorative surfaces. This is particularly disadvantageous with modern high-gloss decors, since unevenness affects the mirror effects of the high-gloss decor. With reactive PUR adhesives, wavy decor papers are history. Subsequent deformation of the adhesive layer after the curing reaction of the adhesive is impossible.

Surface lamination with bio-based hotmelts

Intensive research and development has a long tradition at KLEIBERIT. In terms of sustainability, we have been researching reactive PUR adhesive systems with a proportion of plant-based and sustainable raw materials that are not suitable for food production for a long time. In the area of ​​surface lamination – just like with conventional reactive PUR hot melt adhesives – you can expect excellent adhesive performance and perfectly coordinated production processes. With the right know-how, a considerable proportion of petroleum-based raw materials can be dispensed with.

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