Adhesive bonding
Adhesive bonding allows the same or different parts to be joined by means of an adhesive. This opens up many advantages compared to other joining processes such as welding or riveting. Parts to be joined are not mechanically weakened, forces are transmitted over a wide area, adhesives can conduct heat, insulate or dampen, and relatively free designs with flexible joints can be realized. For this reason, adhesive bonding has become accepted as the joining process of the 21st century across all industries in recent decades.
However, bonding is technically demanding and the design and production must be carried out professionally. We won't leave you out in the cold when it comes to bonding! In addition to our research in the field of adhesive bonding technology, we offer a wide range of services. Due to our industry-oriented approach, we are happy to provide you with advice and support tailored to the needs of your company and your bonding processes.
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3 questions - 3 answers about bonding plastics
5 fundamentals of adhesive bonding
1. Adhesive selection
Using the right adhesive for specific plastics is extremely important. Not all adhesives are suitable for all types of plastic. When selecting an adhesive, the joining partners, environmental conditions, environmental influences, tolerances, aging, load transfer, and other functions and influences must be taken into account. We are happy to provide you with systematic support in selecting the right adhesive.
2. Surface preparation and treatment
The surfaces to be bonded must be clean, dry, and free of grease. Residues such as dust, oil, or lubricants can impair the adhesion of the adhesive. The more thorough the surface preparation, the stronger and more durable the adhesive bond will be. If necessary, surface pretreatment or activation is required to achieve optimum performance in terms of adhesion and long-term stability. In addition to primers as bonding agents, physical processes such as plasma or irradiation are also possible.
3. Adhesive application
When applying adhesives, a distinction is made between manual and automated processes. The application equipment and throughput vary accordingly. In both processes, the correct amount of adhesive, its distribution, and complete filling of the bonding surface after joining are important. Non-destructive measurement technology is often used to monitor adhesive application, especially in automated processes.
4. Fixing and hardening
After joining, it is important to secure the bonded components until they are strong enough to be handled. In addition, the chemistry of the respective adhesives and their chemical reactions must be taken into account for curing. This may include necessary moisture, elevated temperatures, or radiation activation. Manufacturer's specifications regarding curing time and environmental conditions must always be observed.
5. Testing and aging
The performance of adhesives must be tested, particularly in development projects but also during production. In addition to static tests immediately after curing, various application-related load scenarios and aging effects must also be taken into account. In the case of plastics, stress cracking caused by primers or adhesives must also be explicitly considered.
