Method of inflation extrusion molding, extrusion molding apparatus therefor, and process for producing pressure-sensitive adhesive sheet
US7556762B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2004 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Dec 23, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/0019
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.