The production of self-sealing bags generally uses an extruder with a screw diameter of 45~65mm, a compression ratio of 3, and a three-layer filter screen of 80/100/80 mesh. The screw speed is 10~90r/min. Head mold: horizontal center feeding head.
The key to the production of self-sealing bags lies in the machine head mold. The shape and size of the sealing part are not only small and complex, but also have high self-locking properties. Therefore, the convex and concave stems at the sealing part are made of blown film, which is convenient for processing and manufacturing.
Cooling device: The temperature of the bubble tube is above 160 degrees when it is extruded from the machine head, and it is in a semi-fluid or plastic state. The time from inflation to entering the traction clamp is short, only a few seconds to one second. Cooling is not possible, and forced cooling must be implemented. Here, the outer cooling is used, and the cooling air ring is used for cooling.
Splint: The splint is a device that stabilizes the shape of the bubble tube and gradually flattens it into the traction roller. The two splints are arranged in a "herringbone" shape, and the included angle can be adjusted. The flat blowing method is generally 30 degrees. Manufacturing of aluminum sheets.
Traction roller: The diameter of the traction tube is 150~200mm, the two rollers are tensioned by springs, the pressure of the rollers can be adjusted, and the driving roller should be driven by a stepless variable speed motor.
Crimping device: There are many types of crimping devices for self-sealing bags, the simplest is the central axis type, and the "spool" rotating automatic crimping device used in the textile industry is more advanced.
