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A folding box for packing made from a high density foam polypropylene resin board, in which the strength in a connecting portion is secured, durability is improved, and reusability is secured in addition to returnability and recyclability is provided.A folding box for packing is made of high density

A folding box for packing made from a high density foam polypropylene resin board, in which the strength in a connecting portion is secured, durability is improved, and reusability is secured in addition to returnability and recyclability is provided.A folding box for packing is made of high density foam polypropylene resin and contains a developed flat box forming board having two box forming bodies (P 1 ) and (P 2 ) respectively including a main face wall ( 2 ) extendedly provided on one lateral side thereof with a connecting piece ( 1 ), a side face wall ( 3 ), and extendedly provided bottom forming boards ( 4 ) and cover forming boards ( 5 ). A side edge of the bottom forming board ( 4 ) of the sub face wall ( 3 ) of the box forming bodies (P 1 ) and (P 2 ) is made to be an inclined edge ( 6 ) having a 45 degrees angle in respect with a border line between the sub face wall ( 3 ) and the bottom forming board ( 4 ), and the inclined edge ( 6 ) is extendedly provided with a folding connecting piece ( 9 ) having a line for bending into the shape of V ( 8 ) for erasing an effect of elastic memory of the high density foam polypropylene resin occurring in folding. Respective border lines of respective components of the box forming bodies (P 1 ) and (P 2 ) are made to be lines for bending into the shape of mountain ( 7 ) for erasing an effect of elastic memory of the high density foam polypropylene resin. A back surface of the folding connecting piece ( 9 ) extendedly provided to the bottom forming board ( 4 ) of the sub face wall ( 3 ) and a front surface of the bottom forming board ( 4 ) of the main face wall ( 2 ) opposing to the back surface are connected by heat and pressure-fusion.

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1. In a folding box for packing made of high density foam polypropylene resin with an auto bottom structure including a first box forming body (P 1 ) and a second box forming body (P 2 ), each of the box forming bodies (P 1 ) (P 2 ) respectively including:a main face wall ( 2 ) having a connecting p

1. In a folding box for packing made of high density foam polypropylene resin with an auto bottom structure including a first box forming body (P 1 ) and a second box forming body (P 2 ), each of the box forming bodies (P 1 ) (P 2 ) respectively including:a main face wall ( 2 ) having a connecting piece ( 1 ) extending from a first lateral side of the main face wall ( 2 );a sub face wall ( 3 ) extending from a second lateral side of the main face wall ( 2 );a first bottom forming board ( 4 a ) ( 4 c ) extending from a lower edge of the main face wall ( 2 );a second bottom forming board ( 4 b ) ( 4 d ) extending from a lower edge of the sub face wall ( 3 );a first cover forming board ( 5 a ) ( 5 c ) extending from an upper edge of the main face wall ( 2 ); anda second cover forming board ( 5 b ) ( 5 d ) extending from an upper edge of the sub face wall ( 3 ),wherein the second bottom forming board ( 4 b ) ( 4 d ) extending from the sub face wall ( 3 ) has a side edge adjacent to the first bottom forming board ( 4 a ) ( 4 c ) extending from the main face wall ( 2 ), the side edge being an inclined edge ( 6 ) having a 45 degree angle in respect with a border line between the sub face wall ( 3 ) and the second bottom forming board ( 4 b ) ( 4 d ),wherein the first and second box forming bodies (P 1 ) (P 2 ) are mutually connected by heat and pressure-fusion between a back surface of the sub face wall ( 3 ) of the first box forming body (P 1 ) and a front surface of the connecting piece ( 1 ) of the second box forming body (P 2 ), between a back surface of the sub face wall ( 3 ) of the second box forming body (P 2 ) and a front surface of the connecting piece ( 1 ) of the first box forming body (P 1 ), between a front surface of the first bottom forming board ( 4 a ) of the first box forming body (P 1 ) and a back surface of a first folding connecting piece ( 9 a ) of the first box forming body (P 1 ), and between a front surface of the first bottom forming board ( 4 c ) of the second box forming body (P 2 ) and a back surface of a second folding connecting piece ( 9 b ) of the second box forming body (P 2 ); the improvement comprising:lines for bending into the shape of a mountain ( 7 c ), between the main face wall ( 2 ) of the first box forming body (P 1 ) and the first cover forming board ( 5 a ) of the first box forming body (P 1 ), between the sub face wall ( 3 ) of the first box forming body (P 1 ) and the second cover forming board ( 5 b ) of the first box forming body (P 1 ), between the main face wall ( 2 ) of the second box forming body (P 2 ) and the first cover forming board ( 5 c ) of the second box forming body (P 2 ), and between the sub face wall ( 3 ) of the second box forming body (P 2 ) and the second cover forming board ( 5 d ) of the second box forming body (P 2 ), including side grooves ( 74 ) on both sides of a middle groove ( 72 ) through partitions ( 73 ), and said side grooves ( 74 ) and said middle groove ( 72 ) are disposed on an exterior surface of the folding box;lines for bending into the shape of a mountain ( 7 a ), between the main face wall ( 2 ) and the sub face wall ( 3 ) of each of the first and second box forming bodies (P 1 ) (P 2 ) including two side grooves ( 74 ) parallel to a border line and a wide ridge ( 71 a ) between the two side grooves ( 74 ), a width of the wide ridge ( 71 a ) being about twice a thickness of the main face wall ( 2 ), and said side grooves ( 74 ) and said wide ridge ( 71 a ) are disposed on an exterior surface of the folding box; andlines for bending into the shape of a mountain ( 7 b ), between the connecting piece ( 1 ) of the first box forming body (P 1 ) and the main face wall ( 2 ) of the first box forming body (P 1 ), between the connecting piece ( 1 ) of the second box forming body (P 2 ) and the main face wall ( 2 ) of the second box forming body (P 2 ), between the main face wall ( 2 ) of the first box forming body (P 1 ) and the first bottom forming board ( 4 a ) of the first box forming body (P 1 ), between the main face wall ( 2 ) of the second box forming body (P 2 ) and the first bottom forming board ( 4 c ) of the second box forming body (P 2 ), between the sub face wall ( 3 ) of the first box forming body (P 1 ) and the second bottom forming board ( 4 b ) of the first box forming body (P 1 ), and between the sub face wall ( 3 ) of the second box forming body (P 2 ) and the second bottom forming board ( 4 d ) of the second box forming body (P 2 ), including two side grooves ( 74 ) parallel to a border line and a narrow ridge ( 71 b ) between the two side grooves ( 74 ), and said side grooves ( 74 ) and said narrow ridge ( 71 b ) are disposed on an exterior surface of the folding box,wherein the inclined edge ( 6 ) includes the first folding connecting piece ( 9 a ) and the second folding connecting piece ( 9 b ) having a linear region bendable into the shape of a V ( 8 ) for reducing an effect of elasticity of the high density foam polypropylene resin occurring in folding,wherein a concave for fusion ( 10 ) having the high density foam polypropylene resin at a reduced thickness in the shape of an outline of the folding connecting piece ( 9 a ) ( 9 b ) is formed on a front surface of the first bottom forming board ( 4 a ) ( 4 c ), the front surface of the first bottom forming board ( 4 a ) ( 4 c ) overlapping the back surface of the folding connecting piece ( 9 a ) ( 9 b ) in assembling, andwherein the back surface of the folding connecting piece ( 9 a ) ( 9 b ) is fused on a surface of the concave for fusion ( 10 ) in assembling. 2. In a folding box for packing made of high density foam polypropylene resin with an auto bottom structure including one box forming body (P 3 ), the box forming body (P 3 ) including:a first main face wall ( 21 );a connecting piece ( 1 ) extending from a first lateral side of the first main face wall ( 21 );a first cover forming board ( 5 a ) extending from an upper edge of the first main face wall ( 21 );a first bottom forming, board ( 4 a ) extending from a lower edge of the first main face wall ( 21 );a first sub face wall ( 31 ) extending from a second lateral side of the first main face wall ( 21 );a second cover forming board ( 5 b ) extending from an upper edge of the first sub face wall ( 31 );a second bottom forming board ( 4 b ) extending from a lower edge of the first sub face wall ( 31 );a second main face wall ( 22 ) extending from a lateral side of the first sub face wall ( 31 );a third cover forming board ( 5 c ) extending from an upper edge of the second main face wall ( 22 );a third bottom forming board ( 4 c ) extending from a lower edge of the second main face wall ( 22 );a second sub face wall ( 32 ) extending from a lateral side of the second main face wall ( 22 );a fourth cover forming board ( 5 d ) extending from an upper edge of the second sub face wall ( 32 ); anda fourth bottom forming board ( 4 d ) extending from a lower edge of the second sub face wall ( 32 ), the second bottom forming board ( 4 b ) having a side edge made to be a first inclined edge ( 6 a ) having a 45 degree angle in respect with the lower edge of the first sub face wall ( 31 ), the fourth bottom forming board ( 4 d ) having a side edge made to be a second inclined edge ( 6 b ) having a 45 degree angle in respect with the lower edge of the second sub face wall ( 32 ),wherein the box forming body (P 3 ) is connected by beat and pressure-fusion between a front surface of the connecting piece ( 1 ) and a back surface of the second sub face wall ( 32 ), between a front surface of the first bottom forming board ( 4 a ) and a back surface of the first folding connecting piece ( 9 a ), and between a front surface of the third bottom forming board ( 4 c ) and a back surface of the second folding connecting piece( 9 b ); the improvem ent comprising:lines for bending into the shape of a mountain ( 7 c ), between the first main face wall ( 21 ) and the first cover forming board ( 5 a ), between the first sub face wall ( 31 ) and the second cover forming board ( 5 b ), between the second main face wall ( 22 ) and the third cover forming board ( 5 c ), and between the second sub face wall ( 32 ) and the fourth cover forming board ( 5 d ), including side grooves ( 74 ) on both sides of a middle groove ( 72 ) through partitions ( 73 ), and said side grooves ( 74 ) and said middle groove ( 72 ) are disposed on an exterior surface of the folding box,lines for bending into the shape of a mountain ( 7 b ), between the connecting piece ( 1 ) and the first main face wall ( 21 ), between the first sub face wall ( 31 ) and the second main face wall ( 22 ), between the first main face wall ( 21 ) and the first bottom forming board ( 4 a ), between the first sub face wall ( 31 ) and the second bottom forming board ( 4 b ), between the second main face wall ( 22 ) and the third bottom forming board ( 4 c ), and between the second sub face wall ( 32 ) and the fourth bottom forming board ( 4 d ), including two side grooves ( 74 ) parallel to a border line and a narrow ridge ( 71 b ) between the two side grooves ( 74 ), and said side grooves ( 74 ) and said narrow ridge ( 71 b ) are disposed on an exterior surface of the folding box; andlines for bending into the shape of a mountain ( 7 a ), between the first main face wall ( 21 ) and the first sub face wall ( 31 ), and between the second main face wall ( 22 ) and the second sub face wall ( 32 ), including two side grooves ( 74 ) parallel to a border line and a wide ridge ( 71 a ) between the two side grooves ( 74 ), a width of the wide ridge ( 71 a ) being about twice a thickness of the main face wall ( 21 ), and said side grooves ( 74 ) and said wide ridge ( 71 a ) are disposed on an exterior surface of the folding box,wherein the first inclined edge ( 6 a ) is extendedly provided with a first folding connecting piece ( 9 a ), and the second inclined edge ( 6 b ) is extendedly provided with a second folding connecting piece ( 9 b ), the first and second folding connecting pieces ( 9 a ) ( 9 b ) each having a linear region bendable into the shape of a V ( 8 ) for reducing an effect of elasticity of the high density foam polypropylene resin occurring in folding,wherein a first concave for fusion ( 10 ) having the high density foam polypropylene resin at a reduced thickness in the shape of an outline of the first folding connecting piece ( 9 a ) is formed on a front surface of the first bottom forming board ( 4 a ), the front surface of the first bottom forming board ( 4 a ) overlapping the back surface of the first folding connecting piece ( 9 a ) in assembling,wherein a second concave for fusion ( 10 ) having the high density foam polypropylene resin at a reduced thickness in the shape of an outline of the second folding connecting piece ( 9 b ) is formed on a front surface of the third bottom forming board ( 4 c ), the front surface of the third bottom forming board ( 4 c ) overlapping the back surface of the second folding connecting piece ( 9 b ) in assembling,wherein the back surface of the first folding connecting piece ( 9 a ) is fused on a surface of the first concave for fusion ( 10 ) in assembling, andwherein the back surface of the second folding connecting piece ( 9 b ) is fused on a surface of the second concave for fusion ( 10 ) in assembling.