Resin box

Abstract

On a folding section of the thermoplastic sheet there is provided one or more thin-walled section, extending in a longitudinal direction of the folding section, whose minimum thickness is not less than {fraction (1/10)} and not more than ⅔ the thickness of the thermoplastic resin sheet. Thus, it is possible to provide a box in which rebound of the folding section is reduced and an operation efficiency upon setting up the box and putting goods into the box can be improved.

What is claimed is:  
     
         1 . A resin box constituted of a thermoplastic resin sheet including a folding section, wherein 
 the folding section includes at least one thin-walled section, extending in a longitudinal direction of the folding section, whose minimum thickness is not less than {fraction (1/10)} and not more than ⅔ the thickness of the thermoplastic resin sheet.    
     
     
         2 . A resin box constituted by folding at least one thermoplastic resin sheet, wherein: 
 the thermoplastic resin sheet is constituted of two or more side face sections, adjacent to each other, that are connected via folding sections to cover sections and bottom sections both of which are freely foldable, and    each of the folding sections includes two or more thin-walled sections parallel to each other, and    in one folding section, there is provided a level difference between the cover sections adjacent to each other, and in an other folding section, there is another level difference between the bottom sections adjacent to each other, the level difference being 1 to 1.2 times the thickness of the thermoplastic resin sheet.    
     
     
         3 . A resin box constituted by folding at least one thermoplastic resin sheet, wherein: 
 the thermoplastic resin sheet is constituted of two or more side face sections connected via folding sections, each of which has one or more thin-walled section, to cover sections and bottom sections both of which are freely foldable, and the thermoplastic sheet includes a connection portion connected to an opening side portion of at least one of the side face sections adjacent to each other, and    the thermoplastic resin sheet is a monolayer resin sheet constituted of a foamed layer whose expansion ratio is 1.5 to 9, or a multilayer resin sheet constituted of at least one foamed layer whose expansion ratio is 1.5 to 9 and at least one non-foamed layer, and    the connection portion is bonded to the side face section so that a length of the connection portion is substantially as long as a distance between a folding section along a cover sections and a folding section along a bottom section extending from the side face section from which the cover section extends, and a bonding face of the connection portion extends from said one folding section on the side of the cover sections to said other folding section on the side of the bottom sections.    
     
     
         4 . The resin box as set forth in  claim 3 , wherein in one folding section, there is provided one level difference between cover sections adjacent to each other, and in an other folding section, there is provided an other level difference between the bottom sections adjacent to each other.  
     
     
         5 . A resin box constituted so as to be a rectangular prism by folding at least one thermoplastic resin sheet, wherein: 
 the thermoplastic resin sheet is constituted of two or more side face sections connected via folding sections, each of which has one or more thin-walled section, to cover sections and bottom sections both of which are freely foldable, and    the thermoplastic resin sheet is a monolayer resin sheet constituted of a foamed layer whose expansion ratio is 1.5 to 9, or a multilayer resin sheet constituted of at least one foamed layer whose expansion ratio is 1.5 to 9 and at least one non-foamed layer, and    two of the bottom sections adjacent to each other are partially bonded to each other as one pair, and a diagonally folding section is provided in a substantially 45° direction from a corner section on said one pair of the bottom sections that is externally positioned when the bottom sections are folded, said one pair being opposite to another pair of the bottom sections.    
     
     
         6 . The resin box as set forth in  claim 5 , wherein said another pair of the bottom sections is internally positioned when the bottom sections are folded, and the bottom sections of said another pair are overlapped with each other when the bottom sections are folded.  
     
     
         7 . The resin box as set forth in  claim 6 , wherein there is provided a latching section in a protruding manner on one of the bottom sections overlapped with each other, and on an other bottom section, there is provided a latched section constituted of a hole that allows the latching section to come into the latched section.  
     
     
         8 . The resin box as set forth in  claim 1 , wherein the thin-walled section is shorter than the folding section.  
     
     
         9 . The resin box as set forth in  claim 2 , wherein each of the thin-walled sections is shorter than each of the folding sections.  
     
     
         10 . The resin box as set forth in  claim 3 , wherein the thin-walled section is shorter than each of the folding sections.  
     
     
         11 . The resin box as set forth in  claim 1 , wherein the thin-walled section is externally provided.  
     
     
         12 . The resin box as set forth in  claim 2 , wherein each of the thin-walled sections is externally provided.  
     
     
         13 . The resin box as set forth in  claim 3 , wherein the thin-walled section is externally provided.  
     
     
         14 . The resin box as set forth in  claim 1 , wherein in a case where two or more thin-walled sections are provided on the folding section, a total width of the thin-walled sections is 1.4 to 1.7 times the thickness of the thermoplastic resin sheet.  
     
     
         15 . The resin box as set forth in  claim 2 , wherein the two or more thin-walled sections are provided on the folding section so that a total width of the thin-walled sections is 1.4 to 1.7 times the thickness of the thermoplastic resin sheet.  
     
     
         16 . The resin box as set forth in  claim 3 , wherein in a case where two or more thin-walled sections are provided on the folding section, a total width of the thin-walled sections is 1.4 to 1.7 times the thickness of the thermoplastic resin sheet.  
     
     
         17 . The resin box as set forth in  claim 1 , wherein the thermoplastic resin sheet is a monolayer resin sheet constituted of a foamed layer whose expansion ratio is 1.5 to 9, or a multilayer resin sheet constituted of at least a foamed layer whose expansion ratio is 1.5 to 9 and at least one non-foamed layer.  
     
     
         18 . The resin box as set forth in  claim 17 , wherein an antistatic agent is blended in the monolayer resin sheet or at least one outermost layer of the multilayer resin sheet.  
     
     
         19 . The resin box as set forth in  claim 1 , wherein resin constituting the thermoplastic resin sheet is propylene resin.  
     
     
         20 . The resin box as set forth in  claim 2 , wherein resin constituting the thermoplastic resin sheet is propylene resin.  
     
     
         21 . The resin box as set forth in  claim 3 , wherein resin constituting the thermoplastic resin sheet is propylene resin.  
     
     
         22 . The resin box as set forth in  claim 5 , wherein resin constituting the thermoplastic resin sheet is propylene resin.