Structural Design And Performance Study Of Fully Formed Breathable Bra Padding

As the majority of women are concerned about their own chest health and beauty,bra products are growing rapidly.Polyurethane foam(sponge)is widely used in the production of bra pad.The production process is extremely not environmentally friendly and the materials cannot be recycled,which causes great pressure on the environment.Other pad materials,such as the upright cotton and spacer fabrics,have alleviated this situation.However,when they are applied to the bra pad,they need to be molded,the process is complicated and the shape retention is poor.The emergence of 3D printing technology has brought great surprises to people’s lives.As long as the right raw materials are selected,the model is built using 3D software,input into the3 D printer,and various designed entities can be obtained by layer accumulation of materials.3D printing technology has been rapidly applied to all walks of life,and its application in the field of underwear has provided new development prospects for the underwear industry.In this paper,3D printing technology is applied to the design of the bra pad structure,aiming to develop a full-form bra pad suitable for women’s daily wear and good ventilation,which fundamentally solve the problem of discomfort caused by the inability to discharge heat and sweat in time,and the problem of easy breeding of bacteria.In the early stage,a large number of pre-experiments were used to explore the development of 3D printing for fully-formed breathable bra pads,and two 3D printing materials that met the needs of the subject were identified: TPU95 A and PolyFlex.With reference to the numerical simulation results of the pad breathable process,6 fully-formed breathable bra pads with different structures using PolyFlex were designed and printed.The performances were tested as well.The results show that the properties of the printed material have a great influence on the molding effect,compression resilience and the water wash resistance.Compared with the traditional sponge pad,the full-formed breathable bra pads have good breathability and shaping effect,the P5 and P6 have the best breathability.Under the premise of human body pressure comfort,the shaping ability of the pads with thickness of the 24 mm pad is better than that of the 20 mm.The elastic recovery rates of the pad s P1,P2,P3,P4 are all 100%.They also have good compressive resilience.The elastic recovery rate of the pad P5 at points 7 and 8 is 66.7% and 33.3% respectively;and the pad P6 at points 3,6,8 are 20%,40%,33.3%.It indicates that the compression resilience will be lower if the diameter of the surface hole of the pads are bigger.The pad P2,P4,P5 could keep their shape well in size before and after washing.The quality difference was about0.06 g,which could show good washing resistance and satisfy daily washing requirements.By comparing the pads with filling ratios of 10%,15%,20%,it is found that when the thickness is the same,the shaping effect of the pad is basically the same.The filling rate is preferred to be 10% in consideration of printing time and cost.