Innovative Surface Preparation Method of Plastics Using UV Laser

Pre-treated PEEK surface (top left). To improve the mechanical adhesion holes were introduced with D = 95 micrometers  into the surface (depth of this holes is about 13 micro­meters). On the pre-treated regions, a higher oxygen content was detected (Oxygen Peak @ 532 eV, right). This leads to an improvement of the physical adhesion.

Pre-treated PEEK surface (top left). To improve the mechanical adhesion holes were introduced with D = 95 micrometers into the surface (depth of this holes is about 13 micro­meters). On the pre-treated regions, a higher oxygen content was detected (Oxygen Peak @ 532 eV, right). This leads to an improvement of the physical adhesion.

The use of coherent light has been not sufficient explored in adhesive applications for plastic products. The rare use of lasers as surface preparation tool for adhesive bonding of polymeric materials is due to the relatively high price of such laser and the established use of other conventional surface preparation methods (such as corona, low pressure or atmospheric pressure plasma). A significantly higher efficiency and an enormous advantage of laser could be demonstrated in the latest research studies, in the feasibility study for the bonding technique for many applications in the metal sector. The advantages of a laser pre-treatment are in the possible combination consisting of cleaning and increasing in the effective surface of the substrate, modifying chemically the surface and possible accelerated curing of the adhesive.
The focus of a current project is to develop an innovative surface treatment method as a tool for adhesive applications of polymers based on coherent light in the UV wavelength range. A derivative of process parameters for the implementation of this method in the production is another objective of this work. In this research project it will be investigated not only the individual steps of cleaning, pre-treatment or chemical modification, but also the combination of these methods with the aim of a comprehensive application in the field of adhesive joining using a flexible, economical and ecological surface preparation method.
Interested companies are invited to participate as members of the project steering committee and to help shaping this research project.
This research project, 18249 N, is sponsored by AiF (Alliance of Research Associations) within the program to promote Joint Industrial Research (IGF) by the Federal Ministry of Economic Affairs and Energy (BMWi) based on a resolution of the German Parliament. SKZ thanks the BMWi for funding this research project. (Source: SKZ)

Links: SKZ

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