Window profile wrapping

  • PUR hot melts for exterior applications
  • certified adhesive-primer systems for PVC profiles
  • VOC-reduced primers specific products for PVC window profiles

Today, we expect a modern windows or entrance door to last around 25 to 40 years. Within this time, the windows and doors should operate without problems and look good, which means that the laminated foil and the bonding system should not separate from the PVC or aluminium profile, and that no component may disintegrate, even if the exposure stress due to climate conditions is extreme.

For lamination of window profiles, the PUR hot melt adhesives have proven for decades now to be highly suitable. The improvements of the foils used, the steadily increasing variety of materials and decors, and also the reduced storage time for the profiles after lamination - all of these factors represent more challenges for the adhesives. This is why today, we need adhesives that adhere to a multitude of different materials with fast crosslinking, which allows downline processing of the laminated profiles in a short time.

Jowat SE is supplying the reactive hot melt 604.19 for a long time, an adhesive with extremely fast crosslinking. The new product Jowatherm-Reaktant® 604.20 represents a consequent improvement of this system, characterised by an improved adhesion spectrum. In combination with the new Primer Jowat® 406.82, this adhesive not only has the advantage of fast crosslinking, allowing for the profiles to remain only a short time in storage until further downline processing steps; the primer is also not subject to hazard classifications.

This is a responsible improvement by Jowat in the interest of sustainability in the protection of our staff and of the environment. Apart from these aspects, the combination primer/ adhesive also leads to convincing superior bonding results, and of course meets the minimum level for peel strength according to the new RAL-GZ 716, set for 3 N/mm. The standard grammages for the adhesive application usually run from 40 to 70 g/m². For the respective machines in use, the profile and the type of foil, and other process parameters, preliminary customer trials have to be run to define which adhesive/primer system is most suitable and tailored for the respective process.

1. Cleaning of the profile surface by dissolving of usually non-polar foreign matter on the surface, resulting from the PVC formulation or developed during extrusion.


2. Improving the physical adhesion on the profile surface by swelling/slight dissolving and/ or by modifying the surface polarity to enhance adhesion.

New NEP-free and VOC-reduced primers for window profile wrapping: Jowat® Primer 406.82 and Jowat® Primer 406.84 were developed especially for PVC window profile wrapping. The essential advantages are: no labelling as hazardous substances, no softening function, and larger process windows. Further details here: