Sealing principle of valve pocket

The square valve pocket is sewn up and down, leaving a feeding port for machine filling. The packaged products are loaded into the valve pocket from the feeding port under the action of pneumatic or mechanical power. The square valve bag packaging bag of the interface agent includes color printed woven cloth valve bag, paper plastic composite valve bag and kraft paper film clip valve bag. All three materials can be moistureproof. The first two are woven bags, and the last one is film moistureproof. The valve port is moistureproof. The valve port is internally and externally oriented, so the sealing effect is OK. The prominent advantages of the square valve pocket are non-toxic, tasteless, pollution-free, and in line with the national food hygiene standards. Due to the good printing performance of the paper, graphics and characters can be printed according to the requirements of users. The valve mouth paper bag made of this paper is very convenient and fast in the flour filling process. The filling speed can be increased by 3 times, and there is no dust flying, which can improve the working environment. In addition, since the valve mouth paper bag is rectangular after filling, it is easy to stack and should not slide.