Pillow Packaging Bag, Pillow Type Packaged Body, Heat Seal Bar for Pillow Packaging Machine, and Pillow Packaging Machine

Abstract

A pillow packaging bag, a pillow type packaging body, a heat seal bar for pillow packaging machine, and a pillow packaging machine. The pillow packaging bag enabling the suppression of the occurrence of pin holes in a handling step and a transportation course after packaging comprises two lateral seal parts positioned roughly parallel with each other and a contents filling part held by the two lateral seal parts. Damping portions connected to the contents filling portion are formed near both side end parts of the lateral seal part from the border line thereof with the contents filling part near the center part of the lateral seal part toward the lateral seal part.

1 . A heat sealing bar for use in a pillow type packaging machine to be fitted onto a lateral seal forming device for forming lateral seals by heat sealing prescribed regions in a cylindrically shaped film in a lateral direction, the heat sealing bar comprising:
 a pressurizing face; and   a linear seal forming portion comprising:
 a plurality of linear convexes extending in the lateral direction in the prescribed regions on the pressurizing face and configured to form the lateral seals, wherein at least one of the plurality of linear convexes is a first linear convex extending over a full lateral width while others of the plurality of linear convexes are second linear convexes positioned on two sides along the first linear convexes in a film feeding direction, and wherein both ends of the second linear convexes are positioned closer to a central portion in the lateral direction than both ends of the first linear convexes; and 
 a linking convex configured to connect all ends of the second linear convexes and an adjacent first linear convex on both sides in the film feeding direction. 
   
   
   
       2 . The heat sealing bar of  claim 1 , wherein the at least one of the plurality of linear convexes is a plurality of first linear convexes disposed substantially in parallel at intervals in a vertical direction. 
   
   
       3 . The heat sealing bar of  claim 2 , wherein the second linear convexes are disposed substantially in parallel to the plurality of first linear convexes at intervals in the vertical direction. 
   
   
       4 . The heat sealing bar of  claim 1 , wherein a width of the second linear convexes are greater on a content-filled side than on a first linear seals side. 
   
   
       5 . A pillow type packaging machine comprising:
 a vertical seal forming device configured to form vertical seals by heat sealing overlapped ends of a cylindrically shaped film; and   a lateral seal forming device, arranged downstream of the vertical seal forming device in the film feeding direction, configured to form lateral seals by laterally heat sealing prescribed regions in the film cylindrically shaped by the vertical seal forming device in the lateral direction, wherein the lateral seal forming device is a heat sealing bar comprising:   a pressurizing face; and   a linear seal forming portion comprising:   a plurality of linear convexes extending in the lateral direction in the prescribed regions on the pressurizing face and configured to form the lateral seals, wherein at least one of the plurality of linear convexes is a first linear convex extending over the full width while others of the plurality of linear convexes are second linear convexes positioned on two sides along the first linear convexes in a film feeding direction, and wherein both ends of the second linear convexes are positioned closer to a central portion in the lateral direction than both ends of the first linear convexes; and   a linking convex configured to connect all ends of the second linear convexes and an adjacent first linear convex on both sides in the film feeding direction.   
   
   
       6 . The pillow type packaging machine of  claim 5 , wherein the at least one of the plurality of linear convexes is a plurality of first linear convexes disposed substantially in parallel at intervals in a vertical direction. 
   
   
       7 . The pillow type packaging machine of  claim 6 , wherein the second linear convexes are disposed substantially in parallel to the plurality of first linear convexes at intervals in the vertical direction. 
   
   
       8 . The pillow type packaging machine of  claim 5 , wherein a width of the second linear convexes are greater on a content-filled side than on a first linear seals side.