heat set creases, polyethylene terephthalate, PET, origami-based


Polyethylene terephthalate (PET) sheets show promise for application in origami-based engineering design. Origami-based engineering provides advantages that are not readily available in traditional engineering design methods. Several processing methods were examined to identify trends and determine the effect of processing of PET sheets on the crease properties of origami mechanisms in PET. Various annealing times, temperatures, and cooling rates were evaluated and data collected for over 1000 samples. It was determined that annealing temperature plays the largest role in crease response. An increase in the crystallinity of a PET sheet while in the folded state likely increases the force response of the crease in PET sheets. An annealing time of at least 60 min at 160-180oC with a quick cooling results in a high force response in the crease. The effectiveness of the processing methods was demonstrated in several origami patterns of various complexities.

Original Publication Citation

Sargent, B., Brown, N., Jensen, B.D., Magleby, S.P., Pitt, W.G., Howell, L.L., “Heat Set Creases in Polyethylene Terephthalate (PET) Sheets to Enable Origami-Based Applications,” Smart Materials and Structures, Vol. 28, Paper No. 115047,, 2019.

Document Type

Peer-Reviewed Article

Publication Date



Smart Materials and Structures




Ira A. Fulton College of Engineering


Mechanical Engineering

University Standing at Time of Publication

Full Professor