Study of thermal–mechanical properties of polyurethane foam and the three-dimensional shape of molded bra cups

Yick, Kit Lun; Wu, Long; Yip, Joanne; Ng, S.W.; Yu, Winnie

doi:10.1016/j.jmatprotec.2009.08.004

Cited by 22 publications

(11 citation statements)

References 7 publications

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“…With the development of high precision three-dimensional (3D) scanning technique, it will be possible to acquire point cloud data of bra cup. Irregular triangle patches obtained from those points can generate completed bra cup data which is reliable and high accurate [5][6]. Meanwhile, automated dispensing system provides a direct way of dispensing finishing liquids on/into the fabrics [7].…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of functional bra cup by an automated dispensing system

Zhang

Zou

et al. 2019

Industria Textila

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The goal of the study is to develop a novel method to manufacture the functional bras. The high precision three-dimensional (3D) scanner was employed to get the point cloud data. A fixed mount was invented to keep the bra cup stable and decrease measuring error. A bottom holder was prepared by the 3D printer to place the bra cup during the injection process. Furthermore, the injection points coordinate values and the injection volumes can be determined based on the 3D image of the bra cup and the thickness of those positions. At last, the three-axis automatic robot which was coupled with a precision liquid dispenser is used to inject the microcapsules solution into the bra cup for the preparation of functional intimate apparel. The proposed method was verified to be feasible and effective through a practical example.

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Section: Introductionmentioning

confidence: 99%

Facile fabrication of functional bra cup by an automated dispensing system

Zhang

Zou

et al. 2019

Industria Textila

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“…To evaluate the 3D geometrical shape of foam cups, several methods have been proposed to assess the 3D shape conformity and thickness of the moulded cups in objective ways [ 5 , 6 ]. More recently, a new parameterized-based remesh algorithm method has been introduced to measure the 3D shapes of the convex surface of scanned cup samples [ 7 , 8 ]. The shape conformity of the cup was successfully quantified in accordance with the corresponding mould head to determine the optimal moulding conditions, i.e., temperature and duration.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Flexible Polyurethane Foam Shrinkage for Bra Cup Moulding Process Control

Yick

2018

Polymers

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Nowadays, moulding technology has become a remarkable manufacturing process in the intimate apparel industry. Polyurethane (PU) foam sheets are used to mould three-dimensional (3D) seamless bra cups of various softness and shapes, which eliminate bulky seams and reduce production costs. However, it has been challenging to accurately and effectively control the moulding process and bra cup thickness. In this study, the theoretical mechanism of heat transfer and the thermal conductivity of PU foams are first examined. Experimental studies are carried out to investigate the changes in foam materials at various moulding conditions (viz., temperatures, and lengths of dwell time) in terms of surface morphology and thickness by using electron and optical microscopy. Based on the theoretical and experimental investigations of the thermal conductivity of the foam materials, empirical equations of shrinkage ratio and thermal conduction of foam materials were established. A regression model to predict flexible PU foam shrinkage during the bra cup moulding process was formulated by using the Levenberg-Marquardt method of nonlinear least squares algorithm and verified for accuracy. This study therefore provides an effective approach that optimizes control of the bra cup moulding process and assures the ultimate quality and thickness of moulded foam cups.

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“…Thermal properties of the polyurethanes are dependent on their mechanical properties [16]. Foams with closed cells show higher thermal stability than those partially comprising of open cells.…”

Section: Introductionmentioning

confidence: 99%