Fig 1.
Curved crease origami face shield design.
(A) three-quarters view (B) profile view. The individual in this figure has given written informed consent (as outlined in the PLOS consent form) to publish this image.
Fig 2.
Face shield suspension system types.
Simplified illustrations based on designs published by (A) [10] (B) [11] (C) [12] (D) [13].
Table 1.
Characteristics of selected face shield designs grouped by suspension system.
Fig 3.
Elastica curved-crease origami surface generation approach.
A) Elastica B) Extruded elastica C) Curved-crease origami generation.
Fig 4.
(A) Curved crease origami face shield comprised of three surfaces: 1) a forehead rest; 2) a top visor; and 3) a front visor. (B) The design parameters of the unrolled geometry of the face shield (dimensions in mm).
Fig 5.
Iterative physical-digital design workflow used to develop curved crease origami face shield design.
Fig 6.
Analytical parametric model (A) construction sequence and key parameters. (B) Final folded form and pattern parameters.
Fig 7.
Comparison of predicted geometry with 3D photogrammetry scan of face shield on wearer’s head.
1) top right corner extraction point 2) top left corner extraction point 3) manually selected extraction point at top edge of forehead rest.
Fig 8.
Variants of curved crease origami face shields based on the design presented: (A) original (B) variant with increased frontal clearance (for example to accommodate the wearing of surgical loupes underneath the face shield) (C) variant adapted for child (6-10 years).
Table 2.
Parameters used for face shield design variants shown in Fig 8.
Table 3.
Characteristics of manufacturing procedures for curved crease origami face shields, where accessibility and quality each may be “low”, “medium”, or “high”.
Fig 9.
Manual fabrication procedures: (A) manual tracing of digitised boundary, folding, and strap attachment hole curves (B) manual creasing procedure using a ballpoint pen and channel.
Fig 10.
Die used for creasing with a bench-top hydraulic press (A) Illustration of pressing procedure (B) Photograph of prototype creasing die.