Study on the Properties of PLA Filament and Its Mixed Fabrics
|School||Zhejiang University of Technology|
|Keywords||PLA filament heat shrinkage heat-moisture treatment dry heat- treatment moisture transmission wearability|
With the gradual improvement of the living quality, there is a growing demand of costume for consumers, and higher standards are raised to meet the needs of environmental protection and comfort for textile products. Under such condition, PLA fiber came into being,and had gained widespread attention, scholars put much emphasis on the research of degradability of PLA fiber which has shown a great prospect.Meanwhile, PLA fiber also has some disadvantages in the performances such as heat shrinkage will directly lead to distortion of the PLA product which creates difficulties for the promotion of PLA products. Therefore, how to make use of and overcome the shortcomings of PLA fiber becomes a problem to be solved during the process of production. On the other hand, more research work needs to be done to study the performance and style of PLA products.In this paper, research work began with the study on the heat shrinkage of PLA filament, and different dyeing and finishing environment were designed and simulated to study the performances of PLA filament. On this basis, two series of PLA interwoven fabric were designed through selection of fibers and variation of specifications of the fabric. After that, the influence of material and specifications of the fabric which leave on lustrousness, ventilation property, crease recovery and etc had been studied. And cluster analysis was adopted here for further research. The main conclusions are as follows:⑴The shrinkage rate of PLA filament increases as the growth of the bath temperature, the average shrinkage rate of PLA filament is about 30 to 40 times as much as DTY filament whose fineness is 83.3dtex. When the bath temperature reaches 90℃, the shrinkage rate of PLA filament is about 18%. Under the same bath temperature, the shrinkage rate of 55.6dtex PLA filament is about 2% more than 83.3dtex PLA filament.⑵Through resealed range analysis, the following aspects are needed to be pay attention to during heat-moisture treatment for PLA filament. A low temperature near 55℃is preferable, PH controlled between 4 and 5 is considered to be favorable for heat-moisture treatment, and 45 minutes is appropriate here. The damage of PLA filament could be minimized under such a condition which includes temperature, PH and time mentioned above. ⑶After dry heat-treatment for PLA filament, the results turn out that the breaking force of PLA filament decreases by 18.9% compared to the PLA filament untreated, and the breaking elongation and elastic recovery rate increases by 25.9% and 18.8% separately compared to the PLA filament untreated. The damage of PLA filament could be minimized when the temperature is 100℃, heating time is 5 minutes and elongation rate is 4%.⑷Based on the lustrousness of fabric, PLA filament makes less contribution than silk to the improvement of lustrousness. Among the 4 kinds of weaving structures selected in this paper, broken crow twill performs better than others in the aspect of lustrousness, followed by satin, and then plain.⑸It was found that increasing the content of PLA fiber helps to improve the ventilation property and moisture-penetrability; However, the effect is not as significant as wool fiber. Long shaft weave with larger weaving coefficient performs better than plain or broken crow twill in the aspect of ventilation property and moisture penetrability. A positive correlation was found between moisture gain and the content of PLA fiber.⑹PLA filament makes much more contribution than silk or wool fiber to the improvement of stiffness. The flexural rigidity of pure PLA fabric is 5 times more than pure silk fabric.⑺The conclusions of cluster analysis are as follows:1. When scaleplate was chosen as 10, the total fabrics of serie S can be divided into 3 parts which are characterized as pure silk, PLA/silk and silk/wool style respectively.2. When scaleplate was chosen as 12, the total fabrics of serie P can be divided into 2 parts which are characterized as PLA/silk and PLA/wool style respectively.⑻Through comparison of the performance between pure PLA fabric and pure silk fabric, together with the results of cluster analysis, it was found that PLA filament performs equally well as silk in the aspect of moisture transmission, and the results of cluster analysis also reveal a kind of possibility of exploiting silk-imitated fabric by PLA filament fiber.