Title:
【発明の名称】シームレス缶及びその製造方法
Document Type and Number:
Japanese Patent JP3327137
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent cracks in the can hight direction due to an impact from occurring, and improve the dent resistance by a method wherein a large number of dot-form protruding parts are formed on one part or the whole surface of a side wall resin layer on the internal surface of the can, and they are made orientation-relaxing parts. SOLUTION: A seamless can 1 is formed by drawing and bending-straightening or additionally ironing a thermoplastic resin-metal laminate, and consists of a bottom part 2 and a side wall part 3. When desired, a flange part 5 is formed with a neck part 4, at the upper end of the side wall part 3. The side wall part 3 consists of a metal base body 6 and an internal surface thermoplastic resin layer 7. On one part or the whole surface of the can internal surface side wall resin layer 7, a large number of dot-form protruding parts are provided. For the formation, a re-draw-molding or iron-molding at the final state is performed in such a manner that a punch on which a large number of dot-form recessed parts are formed, and the internal surface resin layer 7 of the laminate are engaged, and the shape of the dot-form recessed part is transferred to the internal surface resin layer 7. the formed large number of dot-form protruding parts impart a disturbance, i.e., an orientation-releasing part, to the molecular orientation as the whole body of the resin layer 7, and by this disturbance, even when an impact is applied, the resin layer 7 is prevented from cracking.
Inventors:
Kazuhiro Sato
Nobuyuki Sato
Guzumi Kobayashi
Ryo Kobayashi
Katsuhiro Imazu
Nobuyuki Sato
Guzumi Kobayashi
Ryo Kobayashi
Katsuhiro Imazu
Application Number:
JP24206796A
Publication Date:
September 24, 2002
Filing Date:
September 12, 1996
Export Citation:
Assignee:
Toyo Seikan Co., Ltd.
International Classes:
B65D1/28; B21D22/28; B21D24/00; B21D51/18; B21D51/26; B65D8/12; (IPC1-7): B65D1/28; B21D22/28; B21D24/00; B21D51/18; B21D51/26; B65D8/12
Domestic Patent References:
| JP72241A | ||||
| JP7124656A | ||||
| JP398844A | ||||
| JP3101930A | ||||
| JP146205B2 | ||||
| JP75128B2 | ||||
| JP56501442A |
Attorney, Agent or Firm:
Ikuo Suzuki