Patent ID: 9731885
Date: 2017-08-15
CPC Classifications: B65D

Claim:
1. An airtight sheath, which is composed of at least two outer films being heat-sealed together, the airtight sheath comprising: at least a first buffering body, comprising a plurality of positioning columns and interference columns being arranged in parallel with each other, two opposite sides of each of the positioning columns and the interference columns being heat-sealed to form heat-sealing lines and heat seal the two outer films; a second buffering body, extending from one side of the first buffering body and comprising a plurality of inflating columns, one end of each of the inflating columns being provided with a connecting node adjacent to each of the positioning columns and the interference columns for heat-sealing the outer films, so as to allow the plurality of inflating columns to bend inward with respect to the connecting nodes, and one end of the second buffering body far from the connecting nodes being provided with a connecting heat-sealing side for terminating the plurality of inflating columns; and a third buffering body, extending from another side of the first buffering body opposite to the second buffering body and comprising a plurality of inflating columns, one end of each of the inflating columns of the third buffering body being provided with a connecting node adjacent to each of the positioning columns and the interference columns for heat-sealing the outer films, so as to allow the plurality of inflating columns to bend inward with respect to the connecting nodes, one end of the third buffering body far from the connecting nodes being provided with a connecting heat-sealing side for terminating the plurality of inflating columns of the third buffering body, and at least an airflow channel formed in the first, second and third buffering bodies so as to allow inflating air to flow through the first, second and third buffering bodies, and an opening being formed between tops of the second and third buffering bodies; wherein each of the positioning columns of the first buffering body comprises two opposite end portions and a positioning portion between the two end portions, each of the interference columns comprises two opposite end portions and an interference portion between the two end portions, and the interference portion has a width in cross section less than a width of the positioning portion in cross section, whereby forming an insertion slot between the interference portion and the positioning portion and communicating with the opening for insertion of an external object, the two end portions of each of the positioning columns of the first buffering body respectively provided with bending nodes, the positioning portion of each of the positioning columns further defining a linking section and two bending sections located at opposite ends of the linking section and connecting the two end portions of the positioning column, the two bending sections respectively bending from the bending nodes, one side of each of the two bending sections being heat-sealed to the corresponding inflating column of the second and third buffering bodies such that the two bending sections are located between the linking section and the two end portions of the positioning column.