Patent ID: 8205750

Claim:
A buffer packing material having an air injection path formed with a bypass, comprising: (a) a lower outer sheet; (b) a lower inner sheet overlapping with an upper portion of the lower outer sheet so that a releasing band is formed in an upper portion of the lower inner sheet in a transverse direction along a front edge thereof; (c) an upper inner sheet overlapping with the upper portion of the lower inner sheet and partially fused with the lower inner sheet to form a plurality of air guiding paths; (d) an upper outer sheet overlapping with the upper portions of the upper inner sheet and the lower outer sheet and partially fused with the upper inner sheet, the lower inner sheet and the lower outer sheet to: form longitudinal fusion portions at regular intervals to define a plurality of spaced apart air cells in series in a transverse direction, an air guiding path in air flow communication with each air cell, and simultaneously to form an air injection path at front ends of the plurality of air cells, said air injection path in air flow communication with the plurality of air guiding paths; and (e) wherein the said releasing band formed at the front end of the upper portion of the lower inner sheet is configured to define: a plurality of passages, the passages being formed at positions where the air injection path is connected to the air guiding paths and where the air injection path is in air flow communication with the air guiding paths, and a bypass, the bypass being sections that interconnect the plurality of passages and that are in air flow communication with the plurality of passages, wherein at least one end of one section of the bypass is in communication with the ambient, whereby if air is excessively injected into the air injection path, the overpressure air in the air injection path is discharged to the ambient through the bypass to control the internal pressure of the air injection path and the internal pressure of the plurality of air cells.