Wooden container and a process for manufacturing thereof

Abstract

A wooden container formed by a wooden sheet is provided. The wooden container ( 1 ) is formed by a ply wood sheet comprising two wooden sheets chosen from a large number of wooden sheets, one being an inferior sheet ( 6 a ) including at least one spoiled portion and another one being a superior sheet ( 6 b ) including no such spoiled portion. The inferior and superior sheets are laid with each other and glued mutually. The container comprising a bottom wall ( 2 ) and a peripheral wall ( 3 ) is formed inside with the superior sheet ( 6 b ) and outside with the inferior sheet ( 6 a ). Adhesion film ( 9 ) is formed between contacted surfaces of the sheets by lignin oozed from wood content. Supplementary adhesion may be added if necessary.

1 . A wooden container comprising a plywood sheet ( 6 ) which comprises an inferior wooden sheet ( 6   a ) having at least one spoiled portion ( 7 ) and a superior wooden sheet ( 6   b ) having no such spoiled portion, said container being formed with a bottom wall ( 2 ) and a peripheral wall ( 3 ) by pressing said plywood sheet ( 6 ) within up-and-down dies of a press apparatus, wherein an inside of the container is formed by said superior wooden sheet ( 6   b ) and an outside of the container is formed by said inferior wooden sheet ( 6   a ). 
   
   
       2 . A process for manufacturing a wooden container including a bottom wall ( 2 ) and a peripheral wall ( 3 ) comprising:
 a step of providing a large number of wooden sheets by slicing wooden pieces and forming a smooth surface and a fluffy rough surface ( 8 ) on respective sides of each wooden sheet;   a step of selecting a pair of wooden sheets, one being an inferior sheet ( 6   a ) including at least one spoiled portion ( 7 ) and another one being a superior sheet ( 6   b ) including no such spoiled portion, and forming a plywood sheet ( 6 ) by laying said two sheets ( 6   a,    6   b ) together by contacting the respective fluffy rough surfaces ( 8 ); and   a step of carrying out heating pressurization to said plywood sheet ( 6 ) between male and female dies of a press apparatus under the state that said superior sheet ( 6   b ) faces the male die and said inferior sheet ( 6   a ) faces the female die whereby said wooden container having said bottom wall ( 2 ) and said peripheral wall ( 3 ) is formed while gluing said two sheets ( 6   a,    6   b ) by oozing lignin and moisture from wood content to said rough surfaces ( 8 ).   
   
   
       3 . A process for manufacturing a wooden container including a bottom wall ( 2 ) and a peripheral wall ( 3 ) having a surrounding edge ( 4 ) extending along an upper edge thereof in a shape of circular extending downward in cross section comprising:
 a step of providing a large number of wooden sheets by slicing wooden pieces and forming a smooth surface and a fluffy rough surface ( 8 ) on respective sides of each wooden sheet;   a step of selecting a pair of wooden sheets, one being an inferior sheet ( 6   a ) including at least one spoiled portion ( 7 ) and another one being a superior sheet ( 6   b ) including no such spoiled portion, and forming a plywood sheet ( 6 ) by laying said two sheets ( 6   a,    6   b ) together by contacting the respective fluffy rough surfaces ( 8 );   a first forming step of producing an intermediate product ( 1   a ) by carrying out heating pressurization to said plywood sheet ( 6 ) on its center region except its peripheral region between male and female dies of a press apparatus under the state that said superior sheet ( 6   b ) faces the male die and said inferior sheet ( 6   a ) faces the female die whereby said plywood sheet ( 6 ) is formed with a bottom wall ( 2   a ) and a peripheral wall ( 3   a ) having an edge portion ( 4   a ) extending upwardly therefrom while gluing said two sheets ( 6   a,    6   b ) by oozing lignin and moisture from wood content to said rough surfaces ( 8 ); and   a second forming step of forming a finished product ( 1 ) by carrying out further heating pressurization to said intermediate product ( 1   a ) by clamping entire part thereof whereby said bottom and peripheral walls ( 2   a,    3   a ) are firmly pressed, said edge portion ( 4   a ) is formed with said surrounding edge ( 4 ), thereby the wooden container as the finished product formed with said bottom wall ( 2 ), said peripheral wall ( 3 ) and said surrounding edge ( 4 ) is produced.   
   
   
       4 . A process for manufacturing a wooden container according to  claim 2  wherein said inferior and superior sheets ( 6   a,    6   b ) are dried to reduce moisture in wood content in advance of forming the plywood sheet ( 6 ), and said reduced moisture of limited quantity is oozed together with lignin form wood content to contacting surfaces of the inferior and superior sheets ( 6   a,    6   b ) when heating pressurization is carried out to the plywood sheet ( 6 ), thereby said contacting surfaces are glued mutually. 
   
   
       5 . A process for manufacturing a wooden container according to  claim 3  wherein said inferior and superior sheets ( 6   a,    6   b ) are dried to reduce moisture in wood content in advance of forming the plywood sheet ( 6 ), and said reduced moisture of limited quantity is oozed together with lignin form wood content to contacting surfaces of the inferior and superior sheets ( 6   a,    6   b ) when heating pressurization is carried out to the plywood sheet ( 6 ), thereby said contacting surfaces are glued mutually. 
   
   
       6 . A process for manufacturing a wooden container according to  claim 2 , wherein powder of starch is applied on at least one of the rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) when joining mutually, and said powder becomes paste with steam oozed from wood content when heating pressurization is carried out to the plywood sheet ( 6 ) within the press apparatus so that said rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) are glued mutually. 
   
   
       7 . A process for manufacturing a wooden container according to  claim 3 , wherein powder of starch is applied on at least one of the rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) when joining mutually, and said powder becomes paste with steam oozed from wood content when heating pressurization is carried out to the plywood sheet ( 6 ) within the press apparatus so that said rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) are glued mutually 
   
   
       8 . A process for manufacturing a wooden container according to  claim 4 , wherein powder of starch is applied on at least one of the rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) when joining mutually, and said powder becomes paste with steam oozed from wood content when heating pressurization is carried out to the plywood sheet ( 6 ) within the press apparatus so that said rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) are glued mutually 
   
   
       9 . A process for manufacturing a wooden container according to  claim 5 , wherein powder of starch is applied on at least one of the rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) when joining mutually, and said powder becomes paste with steam oozed from wood content when heating pressurization is carried out to the plywood sheet ( 6 ) within the press apparatus so that said rough surfaces ( 8 ) of the inferior and superior sheets ( 6   a,    6   b ) are glued mutually