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タイトル: ポリプロピレンシートの透明性に対する多層押出しの効果
その他のタイトル: Effect of multilayer extrusion technology on the transparency of polypropylene sheets
著者: 船木, 章
蔵谷, 祥太
山田, 敏郎
金井, 俊孝
Funaki, Akira
Kuratani, Shota
Yamada, Toshiro
Kanai, Toshitaka
発行日: 2011年 5月
出版社(者): プラスチック成形加工学会 = Japan Society of Polymer Processing
雑誌名: 成形加工 = Journal of the Japan Society of Polymer Processing
ISSN: 0915-4027
巻: 23
号: 5
開始ページ: 299
終了ページ: 305
キーワード: Highly transparent PP sheet
Multilayer extrusion
Spherulites
Finite element method
Belt quenching process
抄録: To improve the transparency of isotactic polypropylene sheets, multilayer extrusion was conducted using a resin with lower melt viscosity for the surface layers than one for the core layer. By using multilayer extrusion, the number of spherulites near the surface decreased dramatically and the internal haze of the sheet was improved. The number of spherulites of the sheet cross-section and the internal haze were closely correlated to each other. Each distribution on the flow velocity, shear rate and shear stress in a die lip section was calculated using a finite element method. The shear stress in the sheet thickness direction was reduced when the resin with lower melt viscosity was laminated on both surfaces, and then it was surmised that the stress induced crystallization was considerably restrained in these layers. Furthermore, the cooling simulation in a belt quenching process was conducted, and the prediction formula was derived by multiple regression analysis, using the number density of spherulites as a response variable, and both the plateau area time of the temperature in each thickness direction and shear stress as independent variables, respectively. As a result, the number density of spherulites in various surface layer ratios was predicted using obtained regression formula, and the optimization of the multilayer composition to obtain higher transparency was proposed.
DOI: 10.4325/seikeikakou.23.299
URI: http://hdl.handle.net/2297/28439
関連URI: http://www.jspp.or.jp/index.html
JST.JSTAGE/seikeikakou/23.299
http://ci.nii.ac.jp/naid/40018830068
資料種別: Journal Article
権利関係: Copyright (c) 2011 社団法人 プラスチック成形加工学会
版表示: publisher
出現コレクション:1.査読済論文(工)

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