| In recent years,with the popularization of electronic devices such as computers and mobile phones,the number of low-headed people has also increased,and the incidence of cervical spondylosis has gradually increased and shown a trend of rejuvenation.Chronic strain on the cervical spine is an early manifestation of cervical spondylosis,which can become more and more serious if not maintained in time.The use of hot compresses to relieve cervical strain has been widely certified,and combining the function of hot compresses with a pillow allows for "slow treatment" of cervical spine disorders in daily life or in sleep.At present,most of the heating pillows on the market affect the comfort and softness of the pillow due to the construction and physical characteristics of the heating element,so further exploration is needed to improve the flexibility and comfort of the heating element.The woven nature of conductive yarn also makes the fabric a good substrate and carrier for heating elements,so this paper aims to design and develop flexible electric fabrics,and based on this,the design and development of hot pillows,specific research mainly includes four aspects:（1）elect suitable conductive yarns and fabric substrates as the raw materials of electric heating fabrics.Six conductive yarns are tested for resistance,maximum load current and surface temperature.The data shows:The silver-plated yarn with a specification of 280 D has the best resistance stability because of the significant linear relationship between the length and the resistance value,and can withstand a higher maximum load current.,the surface temperature stability and heating uniformity are better and become the best conductive yarn material.Three kinds of fabrics with relatively small thickness were selected from six kinds of pure cotton fabrics for air permeability and moisture permeability test.Sample 2 became the best base material for electric heating fabrics because the air permeability and moisture permeability were significantly higher than the other two sample.（2）Further explore the process parameters and circuit form of the combination of conductive yarn and fabric substrate,and propose an innovative design of electric heating fabric by pattern sewing.By discussing the stitch type,sewing length and sewing tension in the preparation process of the electric heating fabric,the final stitch type is selected as straight stitch,the stitch length is selected as 2.8mm,and the sewing tension is selected as the state where the tension adjustment dial is 0.The circuit design mainly discusses the yarn spacing,heating area and yarn arrangement.Finally,the yarn spacing is selected as 4mm,and the heating area is set to be about 11cm×8cm.Based on this,12 yarn arrangements are designed.In the innovative design,the resistance value test and heating effect evaluation of the heart-shaped and triangular-shaped heating elements are carried out,and three different arrangements are designed.（3）According to the process parameters and the design of the experimental circuit,the electric heating fabric is prepared,and then the electrothermal properties of the electric heating fabric are tested.The performance test mainly includes resistance stability,thermal stability,heating performance and heating power density test.The resistance change rate of each electrothermal fabric specimen after 50 repeated bending times is about 1%,and the bending resistance is good;L22,L44,N6,N7,N9 have good resistance stability at voltages of 3V and above;except for sample N5,the thermal field uniformity difference ratio coefficient of the other samples is not much different,and the heating uniformity is good;Each electric heating fabric has the characteristics of rapid heating and cooling,and has good electric heating temperature rise performance;the heating power density of each sample has a significant linear relationship with the heating temperature.Sample L22 and sample N9 have good electrothermal stability,good heat uniformity,good temperature rise performance,and better softness and similar temperature rise than common electric heating elements on the market,so they can be applied to the design and development of hot pillows.（4）The electric heating fabric was applied to the design and development of the heat compress pillow and its heating effect was comprehensively evaluated.The results show that the designed and developed hot compress pillow meets the user’s requirements for comfort and softness.On the whole,the two kinds of hot compress pillows have better comfort under different gears.Thermal comfort scores were highest when the pillow was heated at mid-range for 30 minutes.Taking the U-shaped pillow as the objective evaluation object,the heating temperature corresponding to the low,middle and high grades all met the hot compress temperature,and finally stabilized at 40.1 ℃,42.2 ℃ and 44.2 ℃ respectively. |
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