SHEET AND SHEET MANUFACTURING METHOD

• Main Author: FUJINAKA TOSHIHIKO
• Format: Patent
• Language: English; Japanese
• Published: 12.12.2019
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BANDAGES, DRESSINGS OR ABSORBENT PADS; CONTACT LENSES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; OPTICS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PERFORMING OPERATIONS; PHYSICS; PROSTHESES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES; TRANSPORTING; TREATMENT OR PROTECTION OF EYES OR EARS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

To provide a thin sheet in which distortion is suppressed.SOLUTION: A sheet of the present invention is a sheet having a thickness of 0.1 to 5 mm made of a plastic containing at least one selected from polyamide resin, polycarbonate resin, cellulose acylate resin, and acrylic resin, and having a retardation value of the sheet in which a difference between a maximum value and a minimum value is 3000 nm or less. The sheet of the present invention is obtained by, for example, subjecting a plastic containing at least one selected from a polyamide resin, a polycarbonate resin, a cellulose acylate resin, and an acrylic resin to extrusion molding to obtain a sheet-like plastic. It can be produced by subjecting the resultant plastic to vacuum forming, pressure forming, or vacuum/pressure forming.SELECTED DRAWING: None 【課題】歪みが抑制された薄肉シートを提供する。【解決手段】本発明のシートは、ポリアミド樹脂、ポリカーボネート樹脂、セルロースアシレート樹脂、及びアクリル樹脂から選択される少なくとも１種を含むプラスチックからなる、厚み０．１〜５ｍｍのシートであって、当該シートのレタデーション値の最大値と最小値との差は３０００ｎｍ以下である。本発明のシートは、例えば、ポリアミド樹脂、ポリカーボネート樹脂、セルロースアシレート樹脂、及びアクリル樹脂から選択される少なくとも１種を含むプラスチックを押出成形に付してシート状プラスチックを得、得られたシート状プラスチックを真空成形、圧空成形、若しくは真空圧空成形に付することにより製造することができる。【選択図】なし