Effect of T-die Temperature on Heat-sealability of Polypropylene Films Containing β-Form Nucleating Agent

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  • β晶造核剤を添加したポリプロピレンフィルムの熱融着性に及ぼす製膜温度の影響
  • ベータショウゾウカクザイ オ テンカ シタ ポリプロピレン フィルム ノ ネツ ユウチャクセイ ニ オヨボス セイ マク オンド ノ エイキョウ

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Description

Polypropylene (PP) films with β-form nucleating agent were prepared by T-die film extrusion at various T-die temperatures. The relationship between heat-sealability and crystal structure of the film was studied. The following results were obtained. When the T-die temperature was 220°C or 250°C, the crystal structure was not influenced by the amount of β-form nucleating agent. The effect of amount of β-form nucleating agent on the heat-sealability of the films was found to be small. On the other hand, in the case of T-die temperatures of 280°C, the β-form crystal content largely depended on the amount of β-form nucleating agent. β-Form crystals began to appear at 0.05wt% addition of nucleating agent and with the addition of 0.10wt% of nucleating agent, the β-form crystal content reached 0.87. As a result, the heat-sealability of film was improved greatly, and heat-sealing became possible even at 144°C. When β-form nucleating agent was increased further to 0.20wt% or 0.40wt%, the content of β-form crystal decreased and the heat-sealability of films obtained deteriorated. It was found that there is an optimum content of, β-form nucleating agent for enhancing the heat-sealability of PP films.

Journal

  • Seikei-Kakou

    Seikei-Kakou 15 (11), 756-762, 2003-11-20

    The Japan Society of Polymer Processing

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