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Volume 32, Issue 11
Displaying 1-32 of 32 articles from this issue
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HIROSHI KOMORI1976 Volume 32 Issue 11 Pages P379-P381
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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KIYOTAKA MISHIMA1976 Volume 32 Issue 11 Pages P381-P382
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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TAIJIRO MAEKAWA1976 Volume 32 Issue 11 Pages P383-P385
Published: November 10, 1976
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KEIJI KAINUMA1976 Volume 32 Issue 11 Pages P385-P386
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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AKIRA ISHIBASHI1976 Volume 32 Issue 11 Pages P387-P389
Published: November 10, 1976
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EIICHIRO SHIBATA1976 Volume 32 Issue 11 Pages P389-P392
Published: November 10, 1976
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SEIRYO MEKATA1976 Volume 32 Issue 11 Pages P392-P393
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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HIROSHI HONDA, SAKURO YASUMURA1976 Volume 32 Issue 11 Pages P394-P397
Published: November 10, 1976
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HIDEKAZU ICHIKAWA1976 Volume 32 Issue 11 Pages P397-P399
Published: November 10, 1976
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YOSHIO MORI1976 Volume 32 Issue 11 Pages P400-P403
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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YOSHITERU HAMANO1976 Volume 32 Issue 11 Pages P403-P404
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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SAKIO IKEDA, JIRO SIMIZU, YASUJI KOBAYASHI1976 Volume 32 Issue 11 Pages P404-P406
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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KESAHARU KASUGA, AKIRA MATSUBARA1976 Volume 32 Issue 11 Pages P407-P412
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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Made of Colloidal MicaTOICHIRO IZAWA, RENICHI KONDO1976 Volume 32 Issue 11 Pages P412-P414
Published: November 10, 1976
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TATSUO TANGE1976 Volume 32 Issue 11 Pages P414-P417
Published: November 10, 1976
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ATSUSHI NAKAMURA1976 Volume 32 Issue 11 Pages P417-P419
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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KIYOSHI FUKAMI, MOTOYASU SUZUKI1976 Volume 32 Issue 11 Pages P420-P421
Published: November 10, 1976
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AIZO YAMAUCHI1976 Volume 32 Issue 11 Pages P421-P422
Published: November 10, 1976
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HIROO MIYAIRI1976 Volume 32 Issue 11 Pages P423-P425
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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TAKEYUKI MIYAMURA1976 Volume 32 Issue 11 Pages P425-P427
Published: November 10, 1976
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HIROSHI TANZAWA1976 Volume 32 Issue 11 Pages P428-P429
Published: November 10, 1976
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YOSHIO KATSUTA1976 Volume 32 Issue 11 Pages P430-P432
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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AKIRA MAWATARI1976 Volume 32 Issue 11 Pages P433-P434
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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KATSUJI ISHIBASHI, RIKIO KOBAYASHI1976 Volume 32 Issue 11 Pages P435-P436
Published: November 10, 1976
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KAZUO TOYOMOTO1976 Volume 32 Issue 11 Pages P436-P438
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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MASAO HAYASHI, TETUO SEKIGAWA1976 Volume 32 Issue 11 Pages P438-P440
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
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Kenji Yamaishi, Hiroji Kumazawa, Haruo Sanuki1976 Volume 32 Issue 11 Pages T453-T458
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe investigation was made on wettability of polymer surfaces. In general, the wettability of polymer surface is influenced by the conditions under which the polymer is solidified from the solution. It is of interest to examine the effect of substrate contacted with polymer during the process of solidification on the wettability of the polymers.
In this study, the substrata adopted for PAN were aluminium oxide (Al2O3), polyethylene (PE), polytetrafluoroethlene (PTFE). For P (AN-St) and PAN/PSt were Al2O3. Wettability for polymer surface was determined in the same manner as our previous paper. (This journal 32, T145 (1976)).
Results are as follows:
1) In the case of PAN film which was composed of mono-component, the surface wettabilities were influenced only slightly by the kind of substrate.
2) In regard to multi-component polymer such as P (AN-St) and PAN/PSt, the influences of substrate were recognized in their wettabilities; the wettability of Air-side of film decreased with the increasing content of St, while Al2O3-side of film was changed slightly. This fact may be explained by the conception of “Induced Orientation” of polymer. And the differences between Air-side and Al2O3 were shown in the case of blendpolymer more remarkably than in the case of copolymer.View full abstractDownload PDF (350K) -
Takuji Yamaguchi, Hiroaki Ogino, Teruaki Yanagawa, Satoo Kimura1976 Volume 32 Issue 11 Pages T458-T470
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSStress-strain curves for polyethylene films have been measured at various temperatures from 20 to 100 C under different rates of extension over a range of 3.5 decades. Applicability of different superposition principles (model I, II and III) defined in the previous paper to non-linear stress-strain curves has been investigated.
Generally, non-linearity in stress-strain curve decreases with increasing temperature and increased with increasing strain rate. The non-linearity of low density polyethylene is weaker than that of high density polyethylene.
Seemingly, effects of time t and strain ε on stress σ are factorizable so that the secant modulus K (t, ε)=σ (t)/ε equals f (ε) H (t). Therefore the master curve of log K reduced to any strain ε0 can be composed by only vertical shift in log K-log t plots, However, the relaxation modulus at 1% strain calculated from the equation Er (t, ε)=K (t, ε) [1+(dlog K (t, ε)/dlog t)] does not agree with the observed values in the previous paper. Therefore, the superposition principle of model I is not applicable to the case of a constant rate of elongation for polyethylene.
In the theory of model III, if the reduced factor aε (ε) for master relaxation curve satisfies certain conditions, the master curve of secant modulus can be composed and log aε (ε) is obtained from the following equation: where log bε, is the horizontal shift factor for the master curve of log K. But the calculated values from above equation do not agree with observed values in the previous paper. Then stress-strain curves are directly calculated from the superposition principle. Generally, the predicted values from model III agree with observed curves compared to other models. However, appreciable differences between theory and experiment exist at 60_??_80°C as the strain rate increases. The cause of this disagreement is to be sought in neglecting the effect of strain rate on non-linearity in calculation.
Master curves of the secant modulus at each same strain reduced to 20°C are composed by only horizontal shift. Temperature dependences of shift factor log aT are qualitatively similar to those of log aT used to compose master relaxation curves in the previous paper. However, apparent activation energies are unreasonably large as compared with the prevailing data.View full abstractDownload PDF (800K) -
Takuji Yamaguchi, Teruaki Yanagawa, Hiroshi Kimura1976 Volume 32 Issue 11 Pages T470-T478
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe one-step stress relaxation and stress-strain curve (s-s curve) under a constant rate of elongation are measured for drawn low density polyethylene films in the nonlinear strain range at 20°C, and effects of the draw ratio on the behavior are investigated.
Stress relaxation of films at low draw ratios D=1.2_??_2 is remarkable and the rate of stress relaxation decreases with increasing strain. For undrawn (D=1) and highly drawn films (D=3_??_5), the stress relaxation is slight compared with films at low draw ratios, and the rate of stress relaxation is nearly independent of strain. Therefore, the relaxation modulus of undrawn and highly drawn films is factorized into time and strain factors, but at low draw ratios this is not the case. However, master curves of films at low draw ratios from time-strain reduced model (model III) are also not so smooth as that of highly drawn films.
Generally, the nonlinearity of drawn films in the stress relaxation is weaker than that of undrawn films. Relaxation modulus at each strain decreases at initial drawing and then rapidly increases with increasing draw ratio.
The s-s curves of highly drawn films at low strain rates are nearly linear. As strain rates become high, deviation of the s-s curve from linear theory increases. Generally, the calculated s-s curves from superposition principle of model III agree with the observed curves. However, the calculated s-s curves of highly drawn films at low strain rates, are lower than the observed curves, because non-linearity in calculation is overestimated in spite of nearly linear in the observed s-s curves. At high strain rates the calculated s-s curves of films at low draw ratios are greater than the observed curves. The causes of this result are considered as follows: (1) neglecting effect of strain rate on non-linearity in calculation, (2) numerical error introduced by calculation from extrapolated master relaxation curve.View full abstractDownload PDF (552K) -
Jiro Shimizu, Koichiro Toriumi, Hisayoshi Kabeya1976 Volume 32 Issue 11 Pages T479-T489
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSIn the previous paper, it has been reported the twisting mechanism and the twist distributions caused by the air-jet false twister.
In this paper it is shown that the filament yarn can be twisted by the new twister designed by using the air-jet false twister, in which the air can be supplied intermittently.
Generally yarn twisting was thought to take place usually in the form of real twisting (especially in the case of spun yarn), however several new spinning methods (fasciated yarn by Du Pont., ST yarn by Repco Co. and etc.) have been developed recently to overcome the difficulty of speed limitation due to real yarn twisting.
The apparatus in this paper can be used easily as one of the high speed methods for the twisting of fleece and the convergence of filaments.
The twist distributions along the twisted yarn axis are discussed in the case of using one twister and two twisters, when the air was supplied in a form of step changes and intermittently. The results are as follows:
1) The twist distribution at the step input of the air is more variable at the time of start than at stoppage.
2) The intermittent supply of the air generates the alternate twists in the yarn, and the ratio of the lengths between the alternating points of the twist direction does not always agree with the ratio of the time of air supply to interruption.
3) The twist number of the alternate twist varies in accordance with the ON-OFF ratio of the supplied air. There exists an optimum ON-OFF ratio which generates the maximum twist.
4) In the plied yarn the twist appears more under the tensionless than under the tension of twisting process.View full abstractDownload PDF (1654K) -
Fujio Konda, Shinya Kurosaki, Teruyuki Yokoi, Motoyoshi Itoh1976 Volume 32 Issue 11 Pages T489-T495
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSThe sliver was separated into small fiber assemblies applying several separating methods, and the size of the separated fiber assemblies was measured and recorded continuously. The effects of separating conditions on the mean (m), standard deviation (s) of weights of separated fiber assemblies, and the variance (v) between total weights separated per unit time were investigated.
The results obtained are as follows:
(1) In the separating method with roller drafting and air suction, the mean weight of separated fiber assemblies is influenced largely by the velocity ratio of air to the back roller, and not by the velocity ratio of the front roller to the back roller. (Fig. 3, Fig. 4)
(2) In the separating method with combing roller and air suction, the mean weight of separated fiber assemblies is influenced by the velocity ratio of air to the feed roller, and not by the velocity ratio of combing roller to feed roller. (Fig. 5)
(3) The separating methods have great influences on the separation of sliver. The mean weight of separated fiber assemblies is largest when the method with air suction is used, and smallest when the method with combing roller and air suction. (Fig. 9 (A))
(4) As the fiber orientation in sliver increases by drawing, the mean weight of separated fiber assemblies and the weight variation of the assemblies decrease. This tendency is observed in any method. (Fig. 9 (B), Fig. 10)View full abstractDownload PDF (446K) -
Toru Masuko, Mikio Karasawa, Koichiro Yonetake, Saburo Okajima1976 Volume 32 Issue 11 Pages T496-T505
Published: November 10, 1976
Released on J-STAGE: November 28, 2008
JOURNAL FREE ACCESSDiffusion of a disperse dye (C. I. Disperse Yellow 7) in polypropylene film was studied in the absence of water by a desorption sublimation method at 100°C. The films were stretched at 130 or 140°C in polyethyleneglycol and subsequently heat-treated with or without restraint at 150°C, and or immersed in cyclohexane at 68°C. Dichroic orientation factor (fD) of the films dyed with the same dye was used as an orientation parameter and its effect on the diffusion coefficient (D) was studied. One found that D was monotonically decreased with increasing draw ratio (v) or fD, where the D vs. v plots were curves convex toward the v axis, while the D vs. fD plots were comparatively linear; it is suggested that the dye diffusion process is more directly associated with the orientation of the amorphous region in which the dye molecule penetrates. D of the variously treated films with equal value of fD (0.37-0.40) decreases in the order from the swollen film to the heat-treated one with constraint, and a good linear relationship between log D and log E'' (loss modulus) was observed within some of the samples including above films with equal fD value. It is explained that, even though the films have the same degree of amorphous chain orientation, free volume produced by segmental motions in oriented samples varies as a change of effective amorphous chain length which may be resulted in partial melting of metastable quasicrystallites by heat-treatment or swelling, and hence the diffusivity of the dye also changes among these samples.View full abstractDownload PDF (1176K)
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