Pleated filter media are made from a wide variety of materials, such as for instance paper or different nonwoven fabrics. Thermoplastic adhesives for filters from Jowat for pleating and frame bonding are characterised by a broad spectrum of adhesion. In addition, they also function as a sealant, give the filters stability and facilitate highly reliable processes. Due to the special characteristics of these adhesives, the finished filters keep their form throughout their life cycle even while the compound is exposed to mechanical stress e.g. during installation or to high temperatures of over 180 °C. Special polyolefin hot melts can be used for pleating as well as for filter frame bonding and meet all necessary requirements.
Jowat-Hightherm® adhesives provide structural properties due to their superior bonding characteristics on papers and fleece materials, and also the excellent mechanical resistance when used for pleating or frame assembly operations. They get the filters in shape and always remain flexible over the entire life of the filter. They do not undergo deformation, even when the material compound is exposed to mechanical forces or high temperatures.
Engine intake air filters are good examples to explain the importance of these pleated filters. They need to guarantee that the high-performance components are protected against potential damages from rust, pollen, dust, tire abrasion, sand, and other dirt, allowing the engine to operate with effi-cient combustion and without damage. The pleating in this case functions to enlarge the surface while taking up only a small space.
Since the filter materials and also the manufacturing methods differ widely, the adhesives utilized for the pleating process demand special properties: an open time adapted to the line speed, a high initial or green strength / handling stability and a high temperature resistance
Filter papers soaked with phenolic resin undergo thermal processes after pleating which may expose them to temperatures up to 180 °C, and of course, the adhesives must withstand this stress.
The engine compartments of today’s cars are becoming more and more compact, and in consequence allow only very limited space for the air filters. When these are exchanged in the course of maintenance, the filter elements are heavily deformed, which then also requires superior resistance of the bonded frames. The adhesive, specifically the adhesive joint, may not fail, and the filter pockets must remain sealed. Additionally, the performance of the filter element may not be diminished in any way by the adhesive.
The products listed only represent a limited selection of the available product portfolio. Product availability might differ by region. The technical data, characteristics and field of application provided in the table outline the differences between the individual adhesives of the product portfolio. Our Application Technology Department and our Sales Representatives are on hand to provide advice and support you finding the best adhesive for your particular application.
Note: The information on this page is based on test results from our laboratories as well as on experience gained in the field, and does in no way constitute any guarantee of properties. Due to the wide range of different applications, substrates, and processing methods beyond our control, no liability may be derived from these indications nor from the information provided by our free technical advisory service. Customer trials under everyday conditions, testing for suitability at normal processing conditions, and appropriate fit-for-purpose testing are absolutely necessary. For the specifications as well as further information, please refer to the latest technical data sheets.