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Volume 15, Issue 6
Displaying 1-4 of 4 articles from this issue
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Part 4: Fundamental Theory of Stretch-Breaking Process Including Pseudo Stretch-Breaking ProcessTakashi Hiramatsu1969 Volume 15 Issue 6 Pages 201-213
Published: 1969
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSThe stretch-breaking process including pseudo stretch-breaking process, e.g., the stretchbreaking process on Turbo Stapler, consists of the true stretch-breaking process, the pseudo stretch-breaking process and the quasi stretch-breaking process. Diagrams and functional equations have been obtained to show the relation between the input and output of the probability density of fiber leading ends.
The characteristics of the stretch-breaking process including pseudo stretch-breaking procses can be expressed perfectly, like those of the basic stretch-breaking process made up of only two pairs of rollers, by the probability density of breaking points and delivery points.View full abstractDownload PDF (1367K) -
Part 1: Statistical Analysis of the Breaking ProcessHiraku Takeda1969 Volume 15 Issue 6 Pages 214-222
Published: 1969
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSVariations in the fibre length distribution caused by the breakage process, which is assumed to be steady and continuous in time, are discussed generally.
Statistically, such a process is defined by three fractions: (a) the fraction α(l)Δt that a fibre of length l breaks in time Δt; (b) β(l)1; →lΔl that breakage occurs in l-1±Δl along a fibre axis having l1;; and (c) γ(l) Δl that fibre length l is lost in time Δt.
From those fractions an integro-differential equation has been derived giving the number-frequency distribution of fibre lengths at any instant. The equation is soluble by artbitrary functions
Assuming γ=0, methods to obtain α and β experimentally and the upper bound of total number at any instant have been investigated.
By applying the above results to breakage in roller carding, the following estimate of α and β has been obtained: α(l)=kl2.5 β(l1; →l)=6l/l21; -(1-l/l1;) Experimental and calculated distributions agree well if this estimate is used.View full abstractDownload PDF (967K) -
Choji Nozaki, Junzo Hasegawa, Hiroshi Niimi1969 Volume 15 Issue 6 Pages 223-227
Published: 1969
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSCotton slivers delivered from a high-production card, Toyoda CK-7C, at production rates of 35, 50, 70 and 100lbs/hr were processed on three kinds of pre-comber processes with diffeent combinations of draftings, and then spun into 12, 18, 30 and 40s combed yarns. The yarns were compared with those processed on a conventional card at a production rate of 10lbs/hr.
The carding waste was much smaller in amount on the high-production card than on the conventional card. The slivers from the high-production card contained fewer trailing or majority hooks and more leading or minority hooks than the slivers from the conventional card.
It was supposed that this tendency would increase the comber noil, but the noil did not increase if slivers were processed by a pre-comber process with a higher drafting ratio in such a direction that minority hooks would be reduced in number. A saving of cotton is possible by processing on the high-production card for combed yarn in a similar way to the processing of carded yarn.
Increasing the production rate of the card up to 1001bs/hr did not at all affect the quality of coarse combed yarn up to 20s. Nor did it affect the tensile strength or the irregularity of 30 or 40s combed yarn, but it affected slightly the imperfection counts of the yarn. However, no difference at all was found in quality between combed yarns of 30s or 40s processed on the high-production card at 50lbs/hr and the yarns of the same count processed on the conventional card at 10lbs/hr.View full abstractDownload PDF (584K) -
Noboru Aisaka, Tatsuya Kawakami, Tadashi Shindo1969 Volume 15 Issue 6 Pages 228-233
Published: 1969
Released on J-STAGE: October 24, 2006
JOURNAL FREE ACCESSKnitting tension during weft-knitting is experimentally investigated with the aid of a model apparatus and a circular knitting machine. Although the knitting velocity in our experiment using the circular knitting machine was much lower than the ordinary velocity, it is possible to estimate real knitting tension from the results given in this article and in the light of those obtained by the experiment using the model apparatus.
(1) The larger the input yarn tension, the larger the knitting tension and the shorter the stitch length.
(2) Reductions in yarn tension and stitch length by robbing back are estimable from figures showing the relations between input yarn tension and knitting tension and between knitting tension and stitch length.
(3) The relation between knitting tension and the amount of work done by robbing back has nothing to do with knitting condition. The curve of that relation is conditioned by the properties of the yarn used.
(4) The larger the yarn and the higher its flexial rigidity, the larger the knitting tension. The lower the flexial rigidity of the yarn used, the lesser the effect of input yarn tension on knitting tension.View full abstractDownload PDF (679K)
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