Blow sealing device

CN2574882Y
The blow-molded sealing device is implemented in conjunction with a preform socket or blow head, the structure comprising an annular groove and a seal. The inner tube wall of the annular groove is provided with at least one vent hole. The height of the seal member is less than or equal to the height of the inserted outer tube wall and is tangent to the upper and lower end surfaces of the annular groove. Sealing device in the absence of high pressure gas, the seal is built into the annular groove, and does not protrude from the socket tube wall, so that the neck of the preform preform and the seal is not grounded to insert into or remove from the socket, so as not to damage the neck finish . When blowing, the gas pressure is sufficient to push the seal out of the groove, protruding from the wall of the socket until it is tightly attached to the mouth of the socket neck. When the drawing is completed, the seal is retracted inwards to the initial position without gas pressure, making the preform easy to remove.