Analysis of fit pattern of a hygiene mask for an opened mouth

Abstract

A hygiene mask covers the wearer’s nose and mouth, and is intended to prevent exposure to viruses, pollen and so on. It is important to develop a mask that fits well as the user’s mouth closes and opens. How well the mask fits to the face when the user’s face shape changes, for example when speaking, was investigated. The three-dimensional (3D) coordinates of the face of a head mannequin with a wide open mouth were measured using a 3D analyzer. Following this, flat patterns with four different sizes were analyzed using a geometric triangle combination method, as was performed in a previous study. These analyzed patterns for the maximally opened mouth were confirmed to be valid using a statistical test with a draping pattern. No significant differences were detected between the analyzed pattern and draping pattern. Three-dimensional coordinates for 62 participants while they opened their mouths in different shapes were measured and then the flat patterns were analyzed. To allow for the shape variation of the face with the mouth open and to achieve good fitting performance for a larger population, a mask sheet made from knitted fabric was proposed. The extension percentage of the sheet with knitted fabric for the closed mouth was calculated for the open mouths. From the results, the necessary sizes of the mask sheet can be estimated for both the closed and opened mouth.

3D Printed Mask Frames Improve the Inward Protection Efficiency of a Cloth Mask

“…Thus, there is an apparent trade-off between the quality of the filter material and fit. For example, shorter and thicker pieces of cotton-based fabrics (560 MPa), which are often components of cloth masks, are relatively more difficult to bend than thin elastic fabrics (e.g., neck gaiters) . The objective of this study was to demonstrate that additive manufacturing processes are attractive platforms for fabricating personalized low-cost mask frames (i.e., braces) that can improve the efficiency of a commonly used cloth mask (see Figure ).…”

P059_0089_ Pilot Study of a Sheet Pattern for a Gapless Generic Facemask Around a Female Opened Mouth

“…Considering the tip of the nose to be the origin point the 4 sheet sizes were analysed for each subject. Based on the measured 3D data, the distances and inner angles between the points were calculated [2]. And then, the 3D coordinates were transformed into two-dimensional(2D) patterns via triangle combinations [3].…”

Problems related to mask use in hay fever sufferers by repeated surveys

“…In one instance, the experimental data provided information on the protective ability and physical properties of the mask, as well as related problems while wearing a mask. These data will contribute to an improved mask design for HF sufferers (Morishima et al 2015(Morishima et al , 2016, in which both the discomfort and the air gap are reduced to allow complete protection from pollens.…”