PACKAGING MATERIAL AND PACKAGING BAG

摘要

A packaging bag (1) where the heat sealing parts of packaging materials (2, 3) having a printed light shielding layer (14) in the layer structure are overlapped and heat sealed, and a sealing state confirming part (8) having a light transmittance higher than that of the other sealing side is provided across one sealing side (11) out of both sealing sides facing each other when the heat sealing parts are overlapped. Visual confirmation of incomplete heat sealing part can thereby be facilitated.