The application of parametric surface model in mould head design for brassieres

Abstract

Purpose – The purpose of this paper is to establish a parametric surface model for characterizing the shape of mould head and moulded bra cups of various bra styles and cup sizes. Design/methodology/approach – A parametric method for the design and grading of the master head cone is formulated. With this method, the new style of the mould head can be accurately and efficiently designed and/or graded into larger or smaller head sizes. In addition, parameterization based remeshing and a registration algorithm are used to characterize the 3D shapes of the convex surface of scanned mould heads. By using an example-based method, virtual master cones are constructed based on the 3D surfaces of the investigated bra cups after eliminating the style lines and size differences. Then, a new mould head design can be developed from the master cone by drawing the style lines in a virtual environment, different sizes can also be made by grading the wire frame model in a 3D manner. The present method developed from product-driven concept can provide a scientific and effective tool for the product development to support contemporary fashion trend. Findings – Based on remeshing and a registration algorithm, the 3D shapes of the master head cones are characterized. The parametric method can be used for designing new styles and grading of mould heads, and evaluation of cup shape conformity. It also serves as a quantitative method for the evaluation of moulded bra cups and mould head design. Practical implications – The proposed method not only provides useful information for the selection of suitable foam materials and the determination of suitable moulding conditions, but also shortens the design time. It will allow a rapid response to the continuous changing needs of the intimate apparel industry. Originality/value – The results from this study will provide a scientific, practical and effective solution for intimate apparel manufacturers so that they can improve the development process of mould heads.