Screen printing is already established as a printing process in the industry. The technology shows its advantages especially in the production of printed circuit boards or solar modules, in summary for small components and high quantities. Seals made of silicones or other multi-component materials are also already being applied with this process. However, the printing material must be specifically suitable for this purpose. Thanks to our ongoing development, CeraPUR® materials can now also be processed excellently using screen or stencil printing.
Compared to the application in the FIPFG process, two-dimensional applications and components such as bipolar plates are best suited for printing a gasket. If, on the other hand, the sealing application has complex 3D geometries or the requirement that differently shaped components are frequently to be produced on a single line, the use of a 6-axis industrial robot is the better option.
The choice of material for your sealing application: CeraPUR®
CeraPUR® materials are solvent free and not PFAS regulated. They have no free di-isocyanates and are both environmentally and user-friendly. The ability to cure quickly under heat is another advantage of the materials. In the cured state, the materials can also be disposed of in regular domestic waste.
Due to its single-component formulation, there is no potting time to be considered when working with CeraPUR®. The material will not react until the curing temperature is reached.It then sets to form a fully resistant gasket. In contrast to classical 2-component materials, the 1-component material is therefore characterised by its particularly easy handling and application.
Screen printing, the way CeraPUR® is applied onto your component
The procedure begins with the production of a frame, which holds a fine-meshed fabric. It is coated with a photosensitive layer of emulsion and then exposed to the negative of the desired sealing geometry. Once the stencil pattern is transfered onto the screen-mesh, the printer can be set up. Fully automated paste printers are primarily used in this industry. These systems meet the high requirements for consistent quality and the degree of automation for an in-line production.
The printing process itself goes as follows. First, the substrate is placed under the screen. Then the PUR material is dispensed onto the screen and evenly distributed over the surface via a squeegee. This process is also known as 'flooding' in the technical jargon. During the printing process itself, the sealing material is pressed through the open meshes of the screen with another squeegee. This creates the desired sealing geometry on the substrate. After the printing process, the PUR material needs to be cured. Due to the excellent properties of the single-component CeraPUR®, this process can be done in the range of seconds.
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