Patent ID: 9138960
Filing Date: 2015-09-22
Classification: B32B,B65D

Abstract:
1. An airtight sheath having openable air intakes, comprising: two outer films respectively formed with a heat-sealing side for heat-sealing the two outer films together; two inner films attached to the two outer films by a first heat-sealing line, each of the inner films extending along the first heat-sealing line to opposite sides and upper edges of the two outer films; an air inflation path formed between the first heat-sealing line and the upper edges of the two outer films, one end of the air inflation path forming at least one air inflation opening for air inflating, and a buffering portion defined between the first heat-sealing line and bottoms of the outer films; a plurality of second heat-sealing lines disposed on the buffering portion for being heat-sealed to form multiple air columns; a plurality of air guiding portions disposed on an inner surface of at least one of the inner films and coated with a heat-resistant material, each of the air guiding portions extending into a respective air column and crossing the respective air column and the first heat-sealing line to the air inflation path; a plurality of air guiding holes formed on each of the inner films between the plurality of air guiding portions and upper edges of the two inner films and communicating with the air inflation path; and a plurality of heat-sealing blocks disposed between two adjacent inner film and outer film in the air inflation path for heat-sealing the two inner films with the two outer films in the air inflation path; wherein the upper edges of the two inner films and the upper edges of the two outer films are integrally heat-sealed together, and when air is discharged from the at least one air inflation opening of the air inflation path, air currents flow through the plurality of air guiding holes to inflate the two inner films and outer films, whereby each of the air guiding portions is pulled outward to form a current guiding channel between the two inner films, and each of the air intakes is formed in the current guiding channel facing the first heat-sealing line where air is capable of rapidly flowing from the air intakes to fill the multiple air columns in which pressure is generated to press the two inner films against each other in the air columns so as to prevent air from leaking out of the air columns.