TU BRAUNSCHWEIG

GenDru

Resource efficient production of pressure-sensitive moulded adhesives by generative printing processes

Motivation

Pressure-sensitive adhesives and adhesive tapes are already widely used today due to their technologically advantageous properties. In contrast to conventional viscous adhesives for constructional applications, pressure-sensitive adhesives provide a sufficient initial strength immediately after joining, which means that immediate further processing and partly, immediate use of the joined parts is possible. Since the mixing of several adhesive components and the manual application of the adhesives are not necessary, the joining process with pressure-sensitive adhesives is significantly more robust and fault-tolerant. In addition, it does not pose dangers to people and the environment due to solvents and leakages. However, one disadvantage is the very low degree of material utilization during further processing steps of the prefabricated adhesive or adhesive tapes. When stamping the required geometries, e.g. during production of adhesives for mobile phone displays or junction boxes of solar modules, up to 80% of waste is produced. Usually, the waste cannot be used in any other way and has to be disposed of.

Project objective

This is the starting point of the project GenDru. The project combines the technical and ecological advantages of pressure-sensitive adhesives with a material- and resource-efficient manufacturing process for almost any geometric shapes by developing a generative printing process for moulded adhesives. During processing, a solvent-free polymer is applied on the carrier material into geometrical forms and cured by UV omitting LED´s without any further processing processes. This way, the moulded adhesives are being produced in an endless process without stamping. Omitting the stamping process avoids waste during production. 

Approach

The project compares current state of the art for the production of pressure-sensitive stamped adhesives with the production of pressure-sensitive moulded adhesives. For this purpose, the production technology has to be developed and implemented at laboratory level. Both, the development of the printing and curing technology as well as the recipe development represent objectives of the project. The necessary data for the life cycle assessment is collected during the entire project duration and evaluated in order to monitor the efficiency of the new technology with regard to ecological aspects. Since the stamping process is no longer required, a significant reduction of production waste is expected. Manufacturers can not only reduces energy costs, but also avoid the disposal costs for unused stamped adhesives.

Project partners

  • BIOLINK

  • Institute of Joining and Welding  (ifs)

  • Institute of Machine Tools and Production Technology (IWF)
Duration:

03/2016-01/2019

Contact:

Antal Zoltán Dér

Funding:

DBU


  last changed 02.08.2017
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