The Frimo Group announced that genuine decorative seams on interior surfaces can now be effectively sealed against foam penetration on the good side of the component using the company’s new PUR sealing process.

According to the company, in more and more vehicles, decorative surfaces in the interior are provided with genuine decorative seams. In rare cases, these are done manually, but mostly by robots on the three-dimensional decorative skins, for example PVC slush skins. During the subsequent backfoaming with polyurethane, the process pressure can cause the foam mass to bleed through the holes in the seams to the good side of the component at certain points, resulting in rejects. Even the time-consuming taping of the seams with adhesive tape is often insufficient.

This is where the new process for automated decorative seam sealing from Frimo provides a remedy. Using a robot-guided spray lance, the decorative seam on the inside of the decorative skin is sprayed with a fast-reacting polyurethane system. Due to the low viscosity, the sealing material can penetrate the seam and seal it effectively to 100 %, but the special polyurethane cannot penetrate to the outside due to the lack of overpressure or vacuum on the outside.

According to Frimo, the special feature of this development is that the sealing of the seams can be integrated into a synchronised process of existing system layouts, including turn table systems for back foaming. Since the polyurethane system reacts within around 30 seconds, the process step can be partially integrated into the non-productive times of the turn table. In this way, the total cycle time is only marginally extended.

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