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Predecessor
Volume 67, Issue 6
Displaying 1-13 of 13 articles from this issue
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[in Japanese]1994 Volume 67 Issue 6 Pages 387-390
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese]1994 Volume 67 Issue 6 Pages 391-401
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese]1994 Volume 67 Issue 6 Pages 402-403
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese], [in Japanese]1994 Volume 67 Issue 6 Pages 404-405
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese], [in Japanese], [in Japanese]1994 Volume 67 Issue 6 Pages 406-407
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese]1994 Volume 67 Issue 6 Pages 408-410
Published: 1994
Released on J-STAGE: July 09, 2007
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[in Japanese]1994 Volume 67 Issue 6 Pages 411-420
Published: 1994
Released on J-STAGE: July 09, 2007
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1994 Volume 67 Issue 6 Pages 421-422
Published: 1994
Released on J-STAGE: July 09, 2007
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Michiharu TOH, Toyohiko GONDOH, Tetsuo MORI, Yasuhiro MURAKAMI, Haruyu ...1994 Volume 67 Issue 6 Pages 423-428
Published: 1994
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSBR rubber was kneaded using a two-dimensional internal mixer equipped with rotor wings of different shapes and the dependence of void volume on the shape of rotor wings was investigated. When the rear part of the wing cut out concavely, more voids were formed, and the transportation of the rubber below the ram and above the bridge was efficiently carried out.
Then, using the rotor wing having the most effective distribution of rubber, the mixing behavior of BR rubber and ion-exchange particles was studied.
It was observed that the particles first adhered to the free surface of the rubber and became incorporated into the rubber. Then, the rubber was stretched below the ram and above the bridge, and the particles were distributed to the sickel shaped zone of each chamber. In the sickel shaped zone where the renewal of the surface was occurring vigorously, the particles became dispersed by being subjected to elongation and shear stresses during rotation of rotor wings. These mixing behavior occured repeatedly below the ram and above the bridge at each chamber and good dispersive mixing of particles was achieved.View full abstractDownload PDF (786K) -
Tomio KOTAKI, Takashi AKASAKA, Shigeru KAGAMI, Hitoshi SHIOBARA1994 Volume 67 Issue 6 Pages 429-438
Published: 1994
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSA rubber tube reinforced with helically wound fibers having the helix angle of 45 degrees could be used as a spring of vibration type parts feeder. The reasons why the fiber reinforced rubber tube is useful for the feeder, are the easiness for assembling the feeder system and further the large damping effect of rubber material at the resonance frequencies.
In this paper, we analyzed the coupled deformation of this helical fiber reinforced rubber (HFRR) tube under a couple of axial force, P, and torsional moment, T, with consideration of the fixed boundary conditions at both ends. The stiffness matrix and then the compliance matrix of this HFRR tube for P and T are obtained explicitly. The predicted elongation and rotating angle for the unit value of each P and T are shown to agree well with the measured ones. Further, eigen-frequencies of a vibration of feeder system equipped with this HFRR tube are calculated by neglecting the mass of the rubber tube. The predicted eigen-frequencies are proved to agree approximately with the experimental results.View full abstractDownload PDF (870K) -
Mitsuo AKIBA, Tomoaki TAGAMI, Satoshi ISHIMARU, Hiroyuki ONTSUKA1994 Volume 67 Issue 6 Pages 439-447
Published: 1994
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSVulcanization accelerating activity of various polymeric amines and ammonium salts was studied and compared with that of the conventional accelerator CBS in the vulcanization of natural rubber with insoluble sulfur. Polymeric accelerators used in this study were polyvinylpyridines (III-V), polybrene (XII), and polymeric secondary amine (VIII-X) which were prepared by the reactions of epoxy natural rubber with primary amines such as phenylhydrazine. Although the vulcanization accelerating activity of poly (4-vinylpyridine) (III) and polybrene (XII) was inferior to that of CBS, rubber-like high molecular weight polymeric secondary amines (VIII-X) showed excellent accelerating power and further could be regarded as multi-functional compounding agents because of their excellent ability as age resisters and softening agents. Furthermore, the polymeric secondary amine type accelerators (VIII-X) were non-volatile owing to their high molecular weights enough to be confirmed as favorable vulcanization accelerators being superior in stability.View full abstractDownload PDF (669K) -
Yoshito OHTAKE, Tomoko KOBAYASHI, Shigeki ITOH, Hitoshi ASABE, Masuo Y ...1994 Volume 67 Issue 6 Pages 448-455
Published: 1994
Released on J-STAGE: July 09, 2007
JOURNAL FREE ACCESSThe ethyl ether and the n-hexane extracts of LDPE film which has been buried under soil for 32 to 37 years were analyzed by FT-IR measurements and compared with the analytical results of the extracted film. After extraction, the part of the film which was directly in contact with soil showed -C=C- and -OH IR bands. These bands are characteristic of biodegraded PE. On the other hand, a strong -C=O band appeared in the IR spectra of the extracts. The difference in the IR spectra between the extracted film and the extract was more evident for the ether extract than for the n-hexane extract.
The result seems to be in contrast with the generally accepted opinion that the high molecular weight PE does not biodegrade. From IR data we can say that the high molecular weight LDPE is able to biodegrade, while the low molecular weight component of LDPE only undergoes usual oxidative degradation. Thus, the biodegradation of LDPE proceeds not only via exogeneous mechanism but also via endogeneous mechanism along the active oxidation sites on the main chain.
As for the part of the film which was not directly in contact with soil, we could not find any evidence for the biodegradation. The IR spectra of the extracted film as well as the extracts showed only IR bonds being characteristic of usual oxidative degradation. The part of the film which was in contact with soil was whitened by the formation of a number of small pores. Careful SEM obserbation of the pores revealed that the pores enlarged by solvent extraction. This is the direct evidence of the formation of low molecular weight PE by endogeneous biodegradation of LDPE.View full abstractDownload PDF (1272K) -
[in Japanese]1994 Volume 67 Issue 6 Pages 456-457
Published: 1994
Released on J-STAGE: July 09, 2007
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