Envelope

Abstract

A plurality of air relief holes 18 for removing air in a bag are formed in a slit shape at a portion where, when an opening portion of an envelope 10 is sealed by a seating portion 11 a , the air relief holes are concealed by the sealing portion and which is an upper end portion of a second back face 14 of the envelope 10. In case that the envelope 10 is inserted between a pair of upper and lower pressure-contacting rollers from its bottom portion, when the envelope 10 passes through between the pair of upper and lower pressure-contacting rollers rotating in a manner sandwiched therebetween, air staying in a bag of the envelope 10 is exhausted from the air relief holes 18 to the outside, so that the envelope 10 is changed in one sheet shape. Thereby, forces acting on upper and lower faces of the envelope 10 from the pair of upper and lower rollers becomes approximately even, so that occurrence of wrinkles on the envelope 10 is suppressed. Thereby, the envelope 10 is moved straightly up to a printing position, and predetermined printing can be applied to a predetermined portion of the envelope at the predetermined position. Accordingly, predetermined printing can be applied to an envelope without depending on a printing machine or the like and without causing a wrinkle on the envelope and making printing inaccurate.

1 . An envelope that is formed in a bag shape by closing a lower end and left and right side portions and providing an opening portion at an upper end, and providing a sealing portion for sealing the opening portion at an upper end of a back face side, wherein an air relief hole for removing air in a bag is provided at a portion positioned at the upper end of the back face side of the envelope and sealed by the sealing portion. 
   
   
       2 . The envelope as claimed in  claim 1 , wherein a plurality of the air relief holes are formed along a longitudinal direction of the opening portion. 
   
   
       3 . The envelope as claimed in  claim 2 , wherein the plurality of the air relief holes are each formed in a slit shape toward the opening portion. 
   
   
       4 . The envelope as claimed in  claim 1 ,  2 , or  3 , wherein the air relief holes are formed also on both left and right side edge portions of the envelope.