APPLICATION OF HOT MELT ADHESIVES

One of the most important aspects of profile and panel wrapping is glue application.

Profile and panel lamination in the window and furniture industry are usually made with Hot Melt Polyurethane Reactive adhesives (HMPUR) which are part of the HOT MELT adhesives family. This kind of glue presents itself as a solid at room temperature and needs special equipment to melt and be applied without compromise its unique characteristics.

The importance of this aspect lies in the fact that HMPUR glues are not only used for their bonding properties, but also because after the curing time, they become a barrier that protects the materials from humidity, vapour, extreme temperatures, and other conditions, enhancing the durability of the final product over time.

To correctly apply the HMPUR Adhesives, the wrapping machine needs to have a series of set-ups and comply with certain parameters that start with the melting of the HOT MELT PUR glue and continue with the application on the foil where dosage and temperature are key. To guarantee the compliance of the correct application parameters of Hot Melt PUR adhesives, is important to understand the technology behind Slot Nozzles and Melters.

WPR’s Melters and Slot Nozzles are designed to fulfil the most demanding conditions of profile and panel lamination for the window and furniture markets.

First, we have WPR’s Melters. They are specially designed for panel and profile lamination, with a management system called CPU that can be completely integrated with the rest of the wrapping machine. The CPU allows the operators to manage the melt temperature, to program the width of the foil and the grammage of the glue in application, and to track the speed of the profile or panel in the lamination machine.