Packing box for photosensitive recording material

Abstract

A packing box comprising a box body for storing a photosensitive recording material and a lid portion having an insertion flap, wherein two perforated lines including cut portions and non-cut portions arranged alternately are formed from two points at a distance of 50 to 75% of an entire width of the output port toward a bottom portion of the box body so as to approach toward each other at the same angle between 60° and 90° with respect to an upper side of a front panel on the side of the output port of the front panel of the box body to which the insertion flap comes adjacent when the lid portion is closed, wherein an area surrounded by the two perforated lines and lines connecting between upper ends and between lower ends of the respective perforated lines constitutes a substantially trapezoidal opening strip for forming an opening port for facilitating the photosensitive recording material to be taken out from the output port when the respective perforated lines are broken, wherein the cut portions of the perforated line each include a main line extending in a breaking direction and an introduction line formed so as to open at a starting side of the respective cut portions outward from the breaking direction, and wherein the respective cut portions are arranged such that when an imaginary line vertical to the upper side of the front panel is drawn from a terminal of the main line to the cut portion located immediately below, the imaginary line passes through a center area of the introduction line out of three equally divided parts of the cut portion immediately below.

1 . A packing box for photosensitive recording material comprising: 
 a box body of a rectangular shape in cross-section for storing a photosensitive recording material, and    a lid portion having a lid top plate and an insertion flap for enabling opening and closing of an output port for the photosensitive recording material and being formed integrally with the box body,    wherein two perforated lines including cut portions and non-cut portions arranged alternately are formed from two points at a distance of 50 to 75% of an entire width of the output port toward a bottom portion of the box body so as to approach toward each other at the same angle between 60° and 90° with respect to an upper side of a front panel on the side of the output port of the front panel of the box body to which the insertion flap comes adjacent when the lid portion is closed,    wherein an area surrounded by the two perforated lines and lines connecting between upper ends and between lower ends of the respective perforated lines constitutes a substantially trapezoidal opening strip for forming an opening port for facilitating the photosensitive recording material to be taken out from the output port when the respective perforated lines are broken,    wherein the cut portions of the perforated line each include a main line extending in a breaking direction and an introduction line formed so as to open at a starting side of the respective cut portions outward from the breaking direction, and wherein the respective cut portions are arranged such that when an imaginary line vertical to the upper side of the front panel is drawn from a terminal of the main line to the cut portion located immediately below, the imaginary line passes through a center area of the introduction line out of three equally divided parts of the cut portion immediately below.    
     
     
         2 . The packing box for photosensitive recording material according to  claim 1 , wherein the packing box for photosensitive recording material is formed of a corrugated board.  
     
     
         3 . The packing box for photosensitive recording material according to  claim 2 , wherein flutes of the corrugated board are formed in parallel with the upper side of the front panel, and the positions of the corresponding cut portions of the two perforated lines are shifted in the vertical direction toward the upper side of the front panel by a distance corresponding to one third to two third of a pitch of the flutes of the corrugated board.  
     
     
         4 . The packing box for photosensitive recording material according to  claim 1 , wherein the length of the non-cut portion of the respective perforated lines is reduced on the side closer to an upper side of the output port and increased on the side closer to a bottom portion thereof.  
     
     
         5 . The packing box for photosensitive recording material according to  claim 1 , wherein beginning ends of the two perforated lines located on the upper side of the front panel are rounded thereof.  
     
     
         6 . The packing box for photosensitive recording material according to  claim 1 , wherein at least the upper side of the front panel is cut into fine waveforms.  
     
     
         7 . The packing box for photosensitive recording material according to  claim 1 , wherein lines are tooled from a surface opposite from a printed surface of the packing box for photosensitive recording material and the box is formed by valley bending the lines.