高速ラミネート成形における基材/ポリエチレン間の接着性

摘要

Adhesion properties of low-density polyethylene (LDPE)/Kraft paper (KP) and LDPE/aluminum foil (AL) are studied with the surface analysis and the evaluation of the rheological properties in the molten state for LDPE. It is found that peel strength between LDPE and AL with flat surface is sensitive to the degree of surface oxidation of LDPE, whereas adhesion property between LDPE and KP with porous surface is influenced by elongational stress of LDPE at the pressure roll. Further, strain-hardening behavior in elongational viscosity influences "time in the air gap", suggested by numerical simulation of the film casting process. The time in the air gap has a close relation with the degree of surface oxidation. Consequently, controlling the elongational viscosity is required for high speed extrusion coating, especially at higher strain rate.%押出ラミネートは、紙やプラスチックフィルム、金 属箔などの基材表面にTダイから押出された溶融樹脂 フイルムを貼り合わせる成形方法（Fig.1）である。 本成形において基材と溶融樹脂フイルムの接着性はラ ミネート製品の物性を大きく左右する重要な性質であ る。