How is the valve pocket of the square valve bag sealed?

The square valve pocket is seamed up and down, leaving a feed port for the machine. The packaged product is loaded into the valve pocket from the filling port under the action of pneumatic or mechanical power. The square valve pocket bag of the interface agent has a color-coded woven cloth valve pocket, a paper-plastic composite valve pocket and a kraft paper-filled valve pocket. The three materials are moisture-proof. The first two are woven bags to protect against moisture, and the latter one is film-proof. The valve port is protected from moisture, and the valve port has an inner orientation and an outer orientation, and the sealing effect is still possible.
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