巻号一覧
40 巻, 12 号
選択された号の論文の9件中1～9を表示しています
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金井 俊孝, 冨川 昌美, JAMES L. WHITE, 清水 二郎1984 年 40 巻 12 号 p. T465-T479
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーThe theoretical analysis of the tubular film extrusion by using a computer simulation presented several interesting results, such as bubble shape, velocity profile, temperature profile, deformation rate and maximum stretching stress.
The effect of bubble shape was found to be unchanged by variations in the viscosity level. The take-up tension and bubble inflation pressure increased in a linear manner with the viscosity magnitude. The magnitude of activation energy E (16.1 kcal/mol for LDPE, 11.1 kcal/mol for L-LDPE and 7.4 kcal/mol for HDPE) governed the bubble shapes and velocity profiles. A gradual increase in bubble diameter was predicted for LDPE and a wine stem shape for HDPE. The L-LDPE was intermediate. These theoretical results agreed with the experimental ones. We also obtained reasonable results of molten behavior for different process conditions when we considered the crystallization effect. From the theoretical analysis, raising the draw down ratio increased the stretching stress and the maximum deformation rate of both MD and TD. These effects were more remarkable on MD than on TD. Raising the blow up ratio increased the stretching effects of both MD and TD, and these effects were stronger on TD than on MD. Deformation rate decreased with increasing the frost line height, which decreased both MD and TD. Changing the frost line height influenced the cooling condition which was predicted by the heat transfer coefficient.
It can be said that the molten behavior predicted theoretically during the tubular film process agreed with that observed experimentally.抄録全体を表示PDF形式でダウンロード (969K) -
神田 拓馬, 松田 敏和, 坂本 正典1984 年 40 巻 12 号 p. T480-T487
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーPoly (amic-acids) were synthesized from pyromellitic dianhydride (PMDA) and aromatic diamines, of which the resultant C-N bonds are coaxial and oppositely directed (rigid diamines), using Nmethylpyrrolidone as polymerization solvent. Random copolymers composed of rigid diamine, PMDA and 3, 3′, 4, 4′-diphenylethertetracarboxylic dianhydride (DTDA) were also synthesized. These poly (amic-acids) were partially imidized by adding an appropriate amount of acetic anhydride (15_??_30 mole% based on amic-acid unit) into their solutions and then wet-spun, since it was found that partially imidized polymer solutions gave more transparent and void-free coagulated fibers than poly (amic-acid) solutions as polymerized. These fibers were then chemically converted to polyimides by immersing them in an acetic anhydride-pyridine mixture and heat-drawn.
Relatively lower crystalline polyimides such as polypyromellitimides of aromatic diamines bearing chlorine substituent on the nuclei or random copolyimides had better drawability and gave fibers having higher tensile strength than higher crystalline polymers. For example, poly [2, 2′-dichloro-4, 4′-biphenylene/p-phenylene (70/30) pyromellitimide] gave a fiber having tenacity (T) 16.3g/d, elongation (E) 2.0% and initial modulus (Mi) 960g/d. Another random copolymer composed of benzidine/PMDA/DTDA (100/40/60) yielded a fiber with the following tensile properties: T 19.7g/d, E 1.7% and Mi 1310g/d.抄録全体を表示PDF形式でダウンロード (1040K) -
安田 浩, 杉山 博茂, 林 清秀1984 年 40 巻 12 号 p. T488-T493
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーPreviously established theory on the steady-state multi-filament spinning was applied to the actual melt-spinning process of poly (ethylene terephthalate) using a simulation system. The birefringence of spun filament was corelated with the calculated value, δ95, which was obtained at the point where the ratio of yarn velocity to the take-up speed was 0.95. In order to increase the stability of spinning, the effect of variation of the stress calculated just below the orifice, and diameter of nozzle was examined. The eveness of denier in the fiber direction was found to be evaluated by the (dV/dx)max and Xm, which could be obtained at the maximum point of the summarized curve of (dV/dx), where V was the spinning velocity and x was the distance from the nozzle. The obtained results suggest that the theory was effectively applicable to the real melt spinning of multi-filament.抄録全体を表示PDF形式でダウンロード (311K) -
鳥海 浩一郎, 藤本 和士, 浜野 学樹, 近田 淳雄1984 年 40 巻 12 号 p. T494-T503
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーTransients in melt spinning was analyzed by means of linearized perturbation equations, a valid analysis tool for small thickness variations in melt-spun filaments.
Transfer function between each disturbance input and resultant filament unevenness was derived through invariant analysis on linearized perturbation equation. Theoretical transfer functions thus obtained were compared with experimental results for two different input disturbances: cooling air temperature and cooling air velocity.
Results obtained are as follows;
(1) Transfer functions computed and expressed in Bode diagram form show that variations in cooling air velocity and cooling air temperature are comparable to variations in extrusion rate and take up speed with respect to their effects on short term filament unevenness.
(2) From result of melt spinning experiment it was found that, immediately below the spinneret, both cooling-air temperature and velocity were found to fluctuate considerably. Cooling air near the leeward filament was found to be considerably affected by the windward filament: air tempera-ture variation around the leeward filament was several times greater than the velocity variation and the leeward filament was more uneven than the windward filament.
(3) Sensitivity of filament thickness variation to disturbances in cooling air velocity and cooling air temperature depends on the position where the disturbances are exerted. Under the present spinning conditions the spinline was most sensitive to cooling air disturbance approximately 7cm below the spinneret. In conclusion, variation in cooling air temperature was found to be an important cause of filament irregularity.抄録全体を表示PDF形式でダウンロード (732K) -
磯貝 明, 石津 敦, 中野 準三1984 年 40 巻 12 号 p. T504-T511
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリー非水系セルロース溶剤の一種である, SO2-ジエチルアミンージメチルスルホキシドを用い,粉末苛性ソーダとエーテル化剤により合成したセルロースエーテル類(メチルー,カルボキシメチルー,ベンジルー,メタリルーセルロース)の置換基分布を測定し,アルカリセルロースから合成したセルロースエーテル類のそれと比較した。アルカリセルロースのエーテル化における各水酸基の反応性がHO-2>HO-6>HO-3であったのに対して,非水系セルロース溶剤を用いた場合にはHO-6>HO-2〓HO-3となり,さらに各水酸基の反応性の差は水系の場合に比べて小さいことが見出され。抄録全体を表示PDF形式でダウンロード (502K) -
佐々木 博昭, 木藤 半平, 丁子 敬子, 唐沢 幹雄1984 年 40 巻 12 号 p. T512-T518
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーIn order to study the dyeing behavior of textile assemblies, the diffusion coefficients of dyes in cotton cloth roll, namely a piece of cotton cloth wrapping around a glass tube and in aqueous solution were determined.
Two acid dyes were used and the dye bath was not stirred.
The results obtained are as follows:
(a) The concentration distribution in cotton cloth roll was in good agreement with Fick's law curve.
(b) The activation energies of diffusion were about 5 kcal/mol both in cotton cloth roll and in water.
(c) Each diffusion coefficient in cotton cloth roll and in aqueous solution decreased with an increase in NaCl concentration in the dye bath.
Then, the observed diffusion coefficients could be explained reasonably by assuming the pore model which has been accepted for diffusion of ionic dyes into cellulosic substrate: the calculated values agreed well with the experimental values.抄録全体を表示PDF形式でダウンロード (500K) -
栗原 優1984 年 40 巻 12 号 p. P671-P678
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (2092K) -
西田 健三1984 年 40 巻 12 号 p. P679-P683
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1401K) -
臼田 誠人1984 年 40 巻 12 号 p. P684-P688
発行日: 1984/12/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (471K)
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