Optimization of a self-peeling vat for precision vat photopolymerization setups

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This paper presents the optimization of a state-of-the-art self-peeling vat for vat photopolymerization (VP) processes. One of the research goals of the Additive Manufacturing (AM) group from the Technical University of Denmark is to achieve the highest resolution, maximum precision and process optimization for the AM machines and the fabricated components. To achieve this goal, it is essential to have control over every single stage of the manufacturing process. One concern mayor concern in VP is the vat performance, which has to withstand with adhesion forces and wear. The previous setup designed by this research group already outperformed industrial vats by 814% [1], by lowering the normal forces induced by the adhesion between the vat and the part with the aid of a flexible membrane system. Although an improvement on the release-capability was achieved, failure was found in several materials with higher material bonding, which ultimately deformed the surface of the parts. In this work, optimization is achieved by increasing the surface area of the vat, diminishing the stress on the membrane. The building area is moved from the center which creates different peeling angles on each side of the part. The angle asymmetry combines easy peeling with low forces, together with an induced passive tilting mechanism that leads to higher quality of the manufactured samples when microfeatures are present.
Original languageEnglish
Title of host publicationProceedings of the 19th International Conference and Exhibition (EUSPEN 2019)
EditorsC. Nisbet, R. K. Leach , D. Billington, D. Phillips
PublisherThe European Society for Precision Engineering and Nanotechnology
Publication date2019
ISBN (Electronic)978-099577514-5
Publication statusPublished - 2019
Eventeuspen's 19th International Conference & Exhibition - Bilbao, Spain
Duration: 3 Jun 20197 Jun 2019


Conferenceeuspen's 19th International Conference & Exhibition


  • Vat photopolymerization
  • Additive manufacturing
  • Surface adhesion
  • FEP membrane


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