Sen-ito Kogyo最新文献

{"title":"The Report of the 2015 Marcus Wallenberg Prize Ceremony","authors":"岩田 忠久","doi":"10.2115/fiber.71.p-563","DOIUrl":"https://doi.org/10.2115/fiber.71.p-563","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131122645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fatigue Fracture Properties of Wood Plastic Composites","authors":"A. NordinM.N., Yuta Makino, K. Goda, Hirokazu Ito","doi":"10.2115/fiber.71.339","DOIUrl":"https://doi.org/10.2115/fiber.71.339","url":null,"abstract":"Fatigue fracture properties of wood plastic composites (WPC) were investigated. The material was based on a wood flour/ polypropylene (PP) master batch, and prepared to be 30wt% and 50wt% wood flour contents by the addition of PP pellets. First, kneading temperature and screw speed of a uni-axial extruder were changed in some conditions, and 190°C and 20rpm were decided from tensile test of the injection-molded WPC specimens as the optimum manufacturing conditions. Next, tensile and fatigue tests were carried out for WPC specimens with 30wt% and 50wt% wood flour contents. The resultant tensile strength and fatigue life were largely improved as compared to neat PP specimens. When a lump of the master batch remained in the WPC specimen, the strength and life were reduced. It should be noted that, while fatigue life of the neat PP specimens was only 10 to 10 cycles to failure range at 30MPa maximum cyclic stress, those of WPC specimens with 30wt% and 50wt% contents were drastically extended to 10 to 10, and 10 to 10 cycles to failure, respectively. It was estimated that the major cause of fatigue damage in WPC specimens was craze occurring in the matrix, which initiated near the specimen surface, extended into the inner, and finally led to the unstable fracture. (Received 18 May, 2015 ; Accepted 4 September, 2015) # corresponding author *1 山口大学 大学院理工学研究科,現在 Faculty of Mechanical Engineering, Universiti Teknikal Malaysia Melaka (UTeM) *2 山口大学 学部生 *3 山口大学 工学部機械工学科 *4 トクラス(株) 事業開発推進部 1Graduate School of Science and Engineering, Yamaguchi University, Ube 755-8611, Japan 2Undergraduate of Faculty of Engineering, Yamaguchi University, Ube 755-8611, Japan 3Department of Mechanical Engineering, Yamaguchi University, Ube 755-8611, Japan 4TOCLAS Corporation, Business Development Division, Hamamatsu 432-8001, Japan 一般報文 ウッドプラスチック複合材料の疲労破壊特性 Fatigue Fracture Properties of Wood Plastic Composites M. N. A. Nordin , Yuta Makino , Koichi Goda , and Hirokazu Ito *4 (61) SEN’I GAKKAISHI (報文)Vol.71, No. 12 (2015) 339 Wood flour PP Maleic anhydridemodified PP 68.1wt% 29.2wt% 2.7wt% 母材としてポリプロピレン(ホモ系,MI=30,(株)プライム ポリマー製,以下 PPと記す)をそれぞれ用いた.木粉/樹 脂マスターバッチ構成素材の配合率を Table1に示す. Table1のMaleic anhydride-modified PP(無水マレイン酸変 性 PP)とは,木粉と PPの界面結合を高めるために用いら れる相溶化剤であり,この添加によって界面強度は大き く向上することが知られている[5,8]. 2.2 作製方法 マスターバッチと PPを恒温乾燥機で 120°C,5時間処 理し,木粉含有率が所定の割合になるように混合した. これを単軸押出機(ムサシノキカイ(株)製)に投入し両者を 混練した.得られた混練物を簡易ペレタイザによって切 断し,条件によっては得られたペレットを再度混練・切 断し,射出成型機(井元製作所(株)製)を用い,温度 200°C で試験片形状の射出成形品を得た(以下,再度混練したも のを’混練回数 2回’と記し,1回のみを’混練回数 1回’と 記す).Fig. 1にその形状と寸法を示す.まず疲労試験に 先立ち,30wt%木粉含有率の条件下,単軸押出機の混練温 度 180,190°C,スクリュー回転速度を 5,10,20,30rpm に変化させた計 8条件を用い,静的引張試験によって最 適混練温度および最適回転速度(以下,最適条件と記す) を選定した.なお,用いたスクリュー回転速度は混練時 間に換算すると,53,46,20,11分にそれぞれ対応する. 続いて,得られた最適条件で 50wt%木粉含有率の試験片 も作製するとともに,木粉の分散性の影響も評価するた め,混練回数 1回および 2回の試験片を作製し,疲労試 験を実施した. 2.3 引張および疲労試験 疲労荷重の設定に際し,予め静的引張試験を実施した. 試験機として小型卓上試験機(容量 : 1.0kN,JTトーシ(株) 製)を用い,ひずみの測定にはひずみゲージ法を用いた. 引張試験は大気中常温下で行ない,クロスヘッド速度 1.0mm/minで試験片が破断するまで実施した. 疲労試験には電","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133417976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Report of Young Researchers Seminar","authors":"W. Okumura","doi":"10.2115/fiber.71.p-643","DOIUrl":"https://doi.org/10.2115/fiber.71.p-643","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125027052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PREPARATION OF ACETATE RAYON BY THE ACETYLATION OF VISCOSE RAYON WITH ACETIC ANHYDRIDE VAPOR:(XIV) SOME PROPERTIES OF THE ACETYLATED FIBERS","authors":"I. Sakurada, Y. Sakaguchi, K. Suzue, Kazuhiro Nagai","doi":"10.2115/fiber.9.498","DOIUrl":"https://doi.org/10.2115/fiber.9.498","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"809 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123287472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cellulose Nanofiber-Based Composite Materials with Polymer Brush Components","authors":"Keita Sakakibara","doi":"10.2115/fiber.70.p-276","DOIUrl":"https://doi.org/10.2115/fiber.70.p-276","url":null,"abstract":"表面・界面に片末端が固定されたポリマー鎖の集合体は ポリマーブラシと呼ばれ、材料の高性能化・高機能化に重 要な役割を担う。最近では、リビングラジカル重合による 合成技術が進展してシェル層(ポリマーブラシ層)の精密設 計が可能となり、コア(ナノ粒子・ナノファイバー等)とマ トリクス(溶媒や樹脂等)の組み合わせから新規機能材料が 見出されている。 さて、セルロースナノファイバーに関する研究開発が世 界中で活発化している。本誌では東京大学の磯貝明先生や 京都大学の矢野浩之先生による解説記事を参照されたい1)。 セルロースナノファイバー(CNF)は植物細胞壁や酢酸菌 の細胞外分泌物、ホヤの被嚢などにミクロフィブリル(束) として存在し、機械的処理(高圧ホモジナイザー、グライ ンダーなど)や化学的処理(TEMPO酸化、carboxymethyl 化など)により解繊された直径数~数 10nmのナノ繊維で ある。とりわけ、木質バイオマスから得られるCNF2)は豊 富な資源量(セルロース現存量は約 8兆 t)と優れた力学特 性(結晶弾性率:138GPa3)、強度:2-3GPa4))、寸法安定性 (線熱膨張係数:10-7/K5))、高比表面積、透明性、生分解 性、生体適合性などの魅力的な特性を有する。 筆者がCNFに関する研究を開始したのは 2011 年のこ とである。当時、出身研究室(京大院農・中坪文明先生の 研究室)と留学先(オーストリアBOKU大学・Thomas Rosenau 先生の研究室)での機能性セルロース誘導体に関 する研究を経て、物質材料研究機構・有賀克彦先生の下で 博士研究員として動的界面を利用した超分子体に関する研 究に従事していたが、幸運なことに辻井敬亘先生の下で研 究する機会を得た。この赴任をきっかけに、ポリマーブラ シの特性を活かしたCNFの材料開発に取り組むことと なった。本稿ではその最近の研究成果について紹介したい。","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114699597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Division of Biological and Medical Fibers","authors":"K. Ohkawa, M. Mizuno, J. Araki, Y. Tamada, A. Nishikawa","doi":"10.2115/fiber.71.p-335","DOIUrl":"https://doi.org/10.2115/fiber.71.p-335","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127331999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sensation and Measurements Research Committee","authors":"西松 豊典","doi":"10.2115/fiber.72.p-59","DOIUrl":"https://doi.org/10.2115/fiber.72.p-59","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133043470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of Acetate Rayon by the Acetylation of Viscose Rayon with Acetic Anhydride Vapor:(IX). On the Possibility of Pretreatment with a Liquid Medium other than Water","authors":"I. Sakurada, Kazuhiro Nagai","doi":"10.2115/fiber.9.494","DOIUrl":"https://doi.org/10.2115/fiber.9.494","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133838091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of Acetate Rayon by the Acetylation of Viscose Rayon with Acetic Anhydride Vapor:(V) Acetylation of Loosely Packed Fibers with a Current of Acetic Anhydride Vapor","authors":"I. Sakurada, K. Suzue, Y. Sakaguchi","doi":"10.2115/fiber.7.333","DOIUrl":"https://doi.org/10.2115/fiber.7.333","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122904892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"STUDIES ON THE STATIC ELECTRIFICATION OF SYNTHETIC FIBER:(I) A NEW APPARATUS FOR MEASURING THE FRICTIONAL ELECTRICITY OF TEXTILE YARN (II) AN ANALYSIS OF THE FRICTIONAL ELECTRICITY BY A NEW APPARATUS","authors":"K. Sasaki, Kikuo Ban","doi":"10.2115/fiber.19.373","DOIUrl":"https://doi.org/10.2115/fiber.19.373","url":null,"abstract":"","PeriodicalId":224481,"journal":{"name":"Sen-ito Kogyo","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129091779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}