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Volume 20, Issue 8
Displaying 1-6 of 6 articles from this issue
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[in Japanese]1979 Volume 20 Issue 8 Pages 287-291
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (644K) -
[in Japanese], [in Japanese]1979 Volume 20 Issue 8 Pages 294-299
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (877K) -
[in Japanese], [in Japanese]1979 Volume 20 Issue 8 Pages 300-304
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSDownload PDF (593K) -
Part 2: One-Piece DressesKayoko Hanada1979 Volume 20 Issue 8 Pages 305-310
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe regional thermal resistance of one-piece dresses has been determined by using a thermal manikin, the boby of which is movable in its posture and motions.
The main results obtained are as follows:
(1) The effect of the regional thermal insultation ΔR has been determined of the one- piece dresses taking acount of the four factors; size of one-piece dresses (3 levels), posture of manikin (4 levels), belt of manikin (2 levels; with/without), and underwear (2 levels; with/without) .
(2) The relationship was illustrated between the degree of ease of one-piece dreses and the effect of regional thermal insulation ΔR, when an underwear is worn with or without belt. Some suggestions have been made useful for clothing design and clothing habit.
(3) The efficiency (E) of the combined wearing of underwear and outer wear is defined by:
E=100×ΔR (U+O) /ΔR (U) +ΔR (O1)
where, ΔR (U+O) : thermal resistance of one-piece dress when an underwear is worn under one-piece dress,
ΔR (U) : thermal resistance of underwear only, and
ΔR (O1) : thermal resistance of one-piece dress only.
The values of E range from 60 to 110% depending on the parts of the body of the manikin. The average value of E is about 90%.View full abstractDownload PDF (2124K) -
Reiko Ishikubo, Masamitsu Nagano1979 Volume 20 Issue 8 Pages 311-316
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSIn the part 1 of this study, the flammability of the blended yarns was represented by the parallel model of the burning resistance (i. e., reverse of burning rate) of each single fibers.
This paper describes the flame-retarded effects of the yarn finished with flame retardants (cotton finished with THPC, polyester finished with polyvinychloride) on the flammability properties of these multi plied yarns. The experiment was carried out by the direct ignition method, thermogravimetry and infrared spectral analysis and following conclusions were obtained.
(1) The degree of self-extinction of multi plied yarns when exposed under an ignition source become maximum at the specific mixing ratio and the rating was in order of: both yarns finished>only polyester yarn finished>only cotton yarn finished.
(2) General burning resistance of the multi plied yarns was represented by the series and parallel model of the burning resistance of each single yarn.
(3) In the case of the burning of multi plied yarns composed of flame retardant finished yarn and unfinished yarns to the other unfinished yarn during pyrolysis and the flammability properties were decreased.
(4) The burning resistance of the series part of the model was supposed to be the heat transfer reaction of the flame retardant from the finished yarn to the other unfinished yarn.View full abstractDownload PDF (3528K) -
—Tensile Strength of Seam Sewed by Hands—Kozo Shimazaki1979 Volume 20 Issue 8 Pages 317-320
Published: August 25, 1979
Released on J-STAGE: September 30, 2010
JOURNAL FREE ACCESSThe tensile stregth of a seam sewed by hands as shown in Fig. 1 was investigated. The experiments were made under the condition that the seam breaks due to the breakage of a sewing thread.
From the result of the test by the method in Fig.2, an assumption was made that the sewing thread is broken at the circumference of a stitch-hole edge on a fabric in many seams, i.e., a portion indicated by the arrow in Fig. 1. The average seam strength F is formulated by:
F=N {μ-E (Rm) ⋅σ} ………………………………………………… (1)
where,
N: the number of stitch-holes on a seam,
μ: the meam value of the thread strength at the edge of stitch holes,
σ: the standard deviation, and
E (Rm) : 2N⋅N∫∞0 {∫Rm0Φ (t) dt} N-1Φ (Rm)RmdRm
Φ: the probability density function of the standard normal distribution.
The strength of a sewing thread at the edge of stitch-hole on fabric varies according to the sharpness of its edge (fabric thickness) . In this study, the values estimated by the method as shown in Fig. 2 were used as μ and σ (see Table 3) .
The measured seam strength agreed well with the strength calculated by the equation (1) (Table 4) .View full abstractDownload PDF (522K)
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