Nitto-denko Corporation

Tadao Torii

Kooki Ooyama

Shinsuke Ikishima

Naoto Hayashi

Toshihisa Yamane

Yuuki Katou

Keiji Hayashi

Masayoshi Natsume

The present invention provides an apparatus for inflation extrusion molding of pressure-sensitive adhesive sheet, including: one or a plurality of extruders; a die into which one or a plurality of resin materials are respectively introduced and which extrudes from an ejection opening the resin materials into an inflated cylindrical shape having a predetermined diameter in accordance with an inflation method; and two stabilizers facing each other at a predetermined angle so as to upwardly approach each other, and defining a space therebetween through which the cylindrically-shaped resin materials extruded from the die are passed to be deformed into a pressure-sensitive adhesive sheet in a flattened elliptical shape having a predetermined width, in which the stabilizers each have a plurality of air floating portions each of which blows air toward the resin materials; and the stabilizers rotate in one direction around the central axis of the cylindrically-shaped resin materials.

Apparatus and method for inflation extrusion molding of pressure-sensitive adhesive sheet

The present invention provides an apparatus for inflation extrusion molding of pressure-sensitive adhesive sheet, the apparatus including: one or a plurality of extruders; a die into which one or a plurality of resin materials including at least a resin material for forming a pressure-sensitive adhesive layer and extruded respectively from the extruders are respectively introduced and which extrudes from an ejection opening the resin materials into an inflated cylindrical shape having a predetermined diameter in accordance with an inflation method; and two stabilizers facing each other at a predetermined angle so as to upwardly approach each other, and defining a space therebetween through which the cylindrically-shaped resin materials extruded from the die are passed to be deformed into a pressure-sensitive adhesive sheet in a flattened elliptical shape having a predetermined width, in which the stabilizers each have a plurality of air floating portions each of which blows air toward the resin materials; and the stabilizers rotate in one direction around the central axis of the cylindrically-shaped resin materials.

The invention provides a method of inflation extrusion molding, comprising: introducing one or more resin materials extruded from one or more extruders into a die; subsequently extruding the resin material(s) from the die and inflating the extrudate into a cylindrical shape having a predetermined diameter by blown-film extrusion; and then passing the cylindrical inflated resin material through a space between stabilizers which face each other at a predetermined angle, to deform the cylindrical resin material into a flat tube shape having an elongated elliptic section, thereby producing a film or sheet having a predetermined width, wherein the deformation of the cylindrical inflated resin material into a flat tube shape having an elongated elliptic section is assisted by a guide device to thereby facilitate the deformation.

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Osaka, Japan

Tadao Torii