Search results

1 – 4 of 4
To view the access options for this content please click here
Article
Publication date: 7 August 2017

Long Wu, Kit-Lun Yick, Joanne Yip and Sun-Pui Ng

One of the crucial steps in the molded bra production is the process of developing the mold head. The purpose of this paper is to determine the final cups style and size…

Abstract

Purpose

One of the crucial steps in the molded bra production is the process of developing the mold head. The purpose of this paper is to determine the final cups style and size. Compared with traditional development process of the mold head, less time-consuming and a more quantitative method is needed for the design and modification of the mold head.

Design/methodology/approach

A three-dimensional (3D) numerical model for the simulation of large compressive deformation was built in this paper to research the foam bra cup molding process. Since the head cones have more representative than the mold heads, the male and female head cones were used in the simulation. All of the solid shapes are modeled by using 3D Solid 164 elements as well as an automatic surface-to-surface contact between head cones.

Findings

Simulation of the foam cup molding process is conducted by inputting different properties of the foam material and stress-strain curves under different molding temperatures.

Research limitations/implications

In order to simulate the laminated foam moulding process, heat transfer through a layered textile assembly can be studied by using the thermo-mechanical coupled FE model.

Practical implications

According to the different foam performance parameters under different temperatures along with different head cone shapes, distribution and variation in the stress field can be obtained as well as the ultimate capacity of foam materials.

Social implications

A computer-aided parametric design system for the mold heads provides an effective solution to improving the development process of mold heads.

Originality/value

The distribution and variation in the stress fields can be analyzed through simulation, providing a reference for the mold head design.

Details

International Journal of Clothing Science and Technology, vol. 29 no. 4
Type: Research Article
ISSN: 0955-6222

Keywords

To view the access options for this content please click here
Article
Publication date: 4 December 2017

Lu Lu, Kit-Lun Yick, Sun Pui Ng, Joanne Yip and Chi Yung Tse

The purpose of this paper is to quantitatively assess the three-dimensional (3D) geometry and symmetry of the torso for spinal deformity and the use of orthotic bracewear…

Abstract

Purpose

The purpose of this paper is to quantitatively assess the three-dimensional (3D) geometry and symmetry of the torso for spinal deformity and the use of orthotic bracewear by using non-invasive 3D body scanning technology.

Design/methodology/approach

In pursuing greater accuracy of body anthropometric measurements to improve the fit and design of apparel, 3D body scanning technology and image analysis provide many more advantages over the traditional manual methods that use contact measurements. To measure the changes in the torso geometry and profile symmetry of patients with adolescent idiopathic scoliosis, five individuals are recruited to undergo body scanning both with and without wearing a rigid brace during a period of six months. The cross-sectional areas and profiles of the reconstructed 3D torso models are examined to evaluate the level of body symmetry.

Findings

Significant changes in the cross-sectional profile are found amongst four of the patients over the different visits for measurements (p < 0.05), which are consistent with the X-rays results. The 3D body scanning system can reliably evaluate changes in the body geometry of patients with scoliosis. Nevertheless, improvements in the symmetry of the torso are found to be somewhat inconsistent among the patients and across different visits.

Originality/value

This pilot study demonstrates a practical and safe means to measure and analyse the torso geometry and symmetry so as to allow for more frequent evaluations, which would result in effective and optimal treatment of spinal deformation.

Details

Research Journal of Textile and Apparel, vol. 21 no. 4
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Article
Publication date: 1 November 2005

Sun-pui Ng, Roger Ng and Winnie Yu

In the theoretical derivation of the anisotropic model of the woven fabric, Kilby (1963) achieved the symmetric anisotropy model. Yet, in practice, the warp behavior of a…

Abstract

In the theoretical derivation of the anisotropic model of the woven fabric, Kilby (1963) achieved the symmetric anisotropy model. Yet, in practice, the warp behavior of a woven fabric is rarely identical to the weft behavior, even in the case of plain weave fabric of identical yarns in both warp and weft directions because of the manufacturing process. The closed form analytic solution of the asymmetric anisotropic behaviour is very difficult to find for real fabric, due to its nonlinear properties. Therefore, it is important to derive an efficient and accurate method to approximate the nonlinear fabric anisotropy. This paper discusses the issue of incorporating the tensile fabric properties and the bias angle effect into a bilinear stress-strain model. The stress-strain relationship is divided into two regions, below and above the elastic limit. Within each region, a basis function, based on three data points, is used to approximate the angular effect. The advantages of this method include: (1) its simplicity, (2) robust 2-step lookup operation to obtain the answer, (3) full coverage of both linear and nonlinear elastic regions, and (4) ability to achieve high degree of accuracy with only three data points.

Details

Research Journal of Textile and Apparel, vol. 9 no. 4
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Article
Publication date: 1 May 2006

Kit-lun Yick, Wai-ching Chu, Sun-pui Ng and Man-chun Hui Lo

Teenagers with mental handicap have great difficulties in the areas of dress appearance and purchasing appropriate well-fitting garments due to their unusual body…

Abstract

Teenagers with mental handicap have great difficulties in the areas of dress appearance and purchasing appropriate well-fitting garments due to their unusual body configurations, overweight and/or numerous congenital defects. The purpose of this research is to investigate the anthropometric measurements and body motions of mentally handicapped teenagers in Hong Kong so as to provide a conceptual framework for product development of their clothing. The results indicated that about one-third of the mentally handicapped teenagers were obese and this could affect their behavioral development as well as level of social acceptance. The anthropometric measurements of the mentally handicapped group also differed markedly from those of the ordinary group. A large range of anthropometric variations was observed within the mentally handicapped group. The disproportionate body dimensions, combined with large range of anthropometric variations, have created problems of ill-fitting garments and poor dress appearance. In this respect, a specific sizing system covering a broad range of sizes with increased waist girth, thigh girth and back width, but shortened arm length and leg length needs to be derived. As the range of motion (ROM) measurements also indicated significant mobility variations amongst the mentally handicapped group, the body motion analysis results need to be taken into account in order to achieve maximum aesthetics and comfort.

Details

Research Journal of Textile and Apparel, vol. 10 no. 2
Type: Research Article
ISSN: 1560-6074

Keywords

1 – 4 of 4