B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 13/08 (2006.01) B28B 19/00 (2006.01) B28C 5/08 (2006.01) B32B 3/04 (2006.01) B32B 5/14 (2006.01) B32B 7/02 (2006.01) E04C 2/04 (2006.01)
Patent
CA 2479147
There is provided a lightweight plaster board having a cellular porous plaster core, excellent in adhesion to a covering base paper for a plaster board, free from dry-out in side edge parts of the plaster board, and with no disadvantage in workability for driving a nail into the plaster board. The plaster board includes a plaster core having a front surface, a back surface, and four side surfaces, and at least one covering base paper that covers the front surface, the back surface, and the at least two opposite side surfaces of the plaster core. The plaster core includes one or more hard edge parts each including one of the side surfaces covered with the covering base paper, one or more high-density parts including the front surface or the back surface, not including the side surface covered with the covering base paper, and having a density substantially equal to the density of the hard edge part, and a low-density part having a density less than the densities of the hard edge part and the high-density part and contacting with the hard edge part and the high-density part. The hard edge part does not include a position in which a nail is driven.
L'invention concerne un placoplâtre léger, qui comprend un noyau de gypse à structure alvéolaire, lequel comprend une ou plusieurs bordures plus dures à faces latérales couvertes de papier de base de couverture, une ou plusieurs parties haute densité à faces avant et arrière, mais sans les faces latérales susmentionnées, et à densité sensiblement égale à celle des bordures dures, et une partie faible densité, de densité inférieure à celle des bordures dures et des parties haute densité, en contact avec les bordures dures et les parties haute densité. Les bordures dures ne comprennent aucun emplacement de clous à enfoncer, moyennant quoi le placoplâtre adhère parfaitement bien au papier de base de couverture, le séchage des bordures du placoplâtre n'est plus nécessaire, et l'inconvénient de la fonctionnalité requise pour l'enfoncement des clous dans le placoplâre disparaît.
Ishibashi Seigo
Kimura Tatsukazu
Osawa Kenichiro
Tani Hirokuni
Tsuno Norio
Marks & Clerk
Yoshino Gypsum Co. Ltd.
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