Journal of Textile Engineering
Online ISSN : 1880-1986
Print ISSN : 1346-8235
ISSN-L : 1346-8235
46 巻, 4 号
選択された号の論文の4件中1~4を表示しています
  • Part 1: Theoretical analysis of moments on the loop that force the fabric to curl
    Nuray Ucar
    2000 年 46 巻 4 号 p. 109-117
    発行日: 2000年
    公開日: 2006/10/24
    ジャーナル フリー
    Prediction of curling distance of dry-relaxed cotton plain knitted fabric has een realized by using multiple regression analysis. One set of the parameters that are used in the multiple regression analysis is the moments on the loop that force the fabric to curl. There have been several studies of the moments on the loop, but the models developed are too complex for practical use. Thus; in the present study, moments on the loop have been determined by means of Castigliano Theorem, which leads to a more usable model. The following results have been obtained:
    (1) Simple formulas for the moments, My and Mx. These formulas depend on fabric and yarn parameters, such as course-wale spacing, yarn diameter and bending rigidity of yarn. My is the moment that affects the bending and side-curling behavior around the oy axis (Figure 5a). Mx is the moment that affects the bending and top/bottom-curling behavior around the ox axis (Figure 5a).
    (2) Good agreement between My, Mx, as presented and those proposed by Postle and Munden was observed[11](My: 0.0367g cm- 0.04g cm and Mx: 0.1896g cm-0.175g cm).
    (3) Equations 20, 23, 25 and Table 1 and also previous studies [1, 2, 4, 5, 7, 8, 10, 11] show that the values of My, and Mx increase as the tightness factor and bending rigidity of yarn increase. The values of moment around ox axis, Mx, are higher than those around oy axis, My.
  • Part 2: Experimental Study and Regression Analysis for Prediction of Curling Distance
    Nuray Ucar
    2000 年 46 巻 4 号 p. 118-122
    発行日: 2000年
    公開日: 2006/10/24
    ジャーナル フリー
    As mentioned in the Part 1[9], many studies on the curling tendency of knitted fabrics have been done. However, until now, it was not possible to predict the exact curling distance of a fabric. Curling distance is very important in the garment industry where the glued-edge of a fabric is thought of as a material loss. Thus, the aim of present study is to determine the curling distance of fabrics before production. During this study, multiple regression analysis was done between fabric parameters that are known before production and curling distances that are measured by experimentally. In past experimental studies, the curling tendency has been measured because of the difficulties in measuring the curling distance. Thus, in this paper, a new method has been developed to measure the curling distance. The following results have been obtained:
    (1) During the regression analysis, r2 (r: coefficients of correlation) have been found to be 0.75 for both side curling and top/bottom curling (Cs-side curling, Ctb-top/bottom curling, Equation 1 and 2, respectively). Thus, it is possible to predict the curling distance before production, with in a reasonable approximation, using known fabric and yarn parameters. These parameters are loop length[7] that is determined before production, yarn count to calculate yarn diameter and bending rigidity of the yarn. These properties are known before production by experimental, calculation or by definition.
    (2) As pointed out in Part 1[9] and seen from Table 2; the values of the moments about the x axis(about an axis parallel to the courses) are higher than the values of the moments about the y axis (about an axis parallel to the wales) (Mx is bigger than My). But again as seen from Table 2; curling distance about the x axis(Ctb-top/bottom curling) is lower than curling distance about the y axis(Cs-side curling), since bending rigidity of the fabric for bending about the x axis(about an axis parallel to the courses) is higher than the bending rigidity of the fabric about the y axis[3-5].
  • Shen-Kung Liao, Pi-Shiun Chang, Yan-Chia Lin
    2000 年 46 巻 4 号 p. 123-129
    発行日: 2000年
    公開日: 2006/10/24
    ジャーナル フリー
    Polypropylene fabrics were dyed under various conditions by supercritical carbon dioxide technology. Amounts of dye absorbed by polypropylene fibers were calculated from the visible spectrum and penetration of dye was observed by microscopy. The result showed dye had diffused into fibers and dye uptake values of carbon dioxide dyeing obtained from visible analysis were much higher than that of water. X-ray and DSC analysis indicated that dyeing behavior of polypropylene with disperse dyes obeyed the free volume model. No obvious damage had happened while fabrics dyeing at 120°C in accordance with the TGA and mechanical properties test. Wash fastness was the major problem to be necessary to overcome on this dyeing method.
  • Part 3: Machinability
    Hiroaki Kanai, Kiyohide Yagyu, Akira Maruta, Masaru Nakazawa, Takashi ...
    2000 年 46 巻 4 号 p. 130-142
    発行日: 2000年
    公開日: 2006/10/24
    ジャーナル フリー
    The influences of the compounding ratio of sintered MoS2 and FeMn on cutting resistance, plastic flow of sample surface roughness, air permeability and wear of tool were studied experimentally for the purpose of improving the surface characteristics of iron based sintered ring for spinning frame. The result obtained are as follows;
    (1)It has been confirmed that the machinability of iron based sintered alloy varies to a cosiderable extent depending on the compounding ratio of the sintered auxiliaries MoS2 because of the lubricating effect of it.
    (2)It has been shown that, because the cutting resistance diminishes with an increase of MoS2 basically, the layer subject to deformed layer on the surface of the sample gets thinner and the air permeability improves accordingly.
    (3)The surface roughness regularly changes according to the amount of cutting. Especially with MoS2 content of 67% or over the surface roughness improves and remains unchanged even with an increase in the amount of cutting.
    (4)At MoS2 content of 59% or machinability drops causing greater wear of the tool. On the other hand at MoS2 content of 71.4% or over occurrence of built-up was observed at the top of the component cutter.
    (5)It has been proved that a MoS2 content of 60-70% is desirable, by judging globally from air permeability surface roughness and wear of tool.
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