Laminated woven bag has poor breathability, what to do ?

     The changes in the market now make the types of woven bags more and more. Recently, many customers will ask Xiaobian to make woven bags. bag. If the bags are stacked for a long time, the bags will not be breathable for a long time, which will have a certain impact on the products inside. Then how to solve its breathability?
      For the composite film woven bag, we must also consider the problems of running, escaping, ash leakage during filling, and moisture resistance during transportation and use. Large vent holes, large number of holes, good exhaust performance, high filling efficiency, but serious cement run-off during filling, poor moisture resistance; small vent holes, small number of holes, poor exhaust performance, filling Low efficiency, but less cement run-off during filling, and good moisture resistance. Therefore, the size and density of the pinholes are the key factors affecting the phenomenon of ash and cement moisture resistance during cement filling. Needle diameter of 2mm or 1.5mm can meet both requirements. The general operation is: one needle eye every 6mm in the longitudinal direction of the laminating cloth, and one needle eye every 8mm in the horizontal direction. Through the processing of the composite film plastic woven bag, the gas is easily discharged from the inside to the outside during filling, which meets the exhaust requirements during cement filling, and can also ensure the pass rate of the bag weight, and at the same time run out during filling The gray phenomenon can also be resolved. The cement-filled packaging bag is automatically closed after the vent hole contacts the belt during the contact belt conveying process, which better solves the moisture-proof performance of the cement packaging during transportation and storage. Because the cement production process and equipment level are different, the temperature of the cement warehouse is different, generally between 50 ℃-100 ℃. If the quality of the base fabric of the laminated plastic woven bag can meet the requirements of GB8974, it can solve the temperature resistance problem of cement packaging. When the temperature of the cement warehouse is high, the thickness of the composite film woven bag can be appropriately increased. If one-sided pursuit of reducing costs, using inferior plastic raw materials, adding excessive additives, unstable process conditions, equipment levels can not meet product quality requirements, even if the plastic woven bag is thicker, it cannot fundamentally solve the problem of packaging temperature resistance.