VINYL ENVELOPE WITH CONER SEALING LINE

摘要

PURPOSE: A corner-reinforced plastic bag is provided to maintain the bonding force of the corner part under overload by distributing the adhesive force concentrated on the corner part. CONSTITUTION: A plastic bag (50) is sealed to form an inclined bond line along the shape that the side (51) of the plastic bag is spread on the corner (66) in which a folding projection (54) on the side and the lower thermal bonding line (55) are merged. The inclined bond line includes a first inclined bond line with a small inclination from the corner, and a second inclined bond line with a larger inclination angle from the first inclined bond line than the angle of the first inclined bond line. The length of the first bond line is shorter than the length of the second bond line.