1. When designing a food-grade ton bag, first determine the weight of the loaded goods, and determine the volume of the food-grade ton bag according to the specific gravity of the packaged materials. It also depends on whether the loaded material is a sharp and hard block material. If so, when designing a food-grade ton bag, the base fabric should be thicker, and on the contrary, it can be thinner.
2. Structural design: When designing the food-grade ton bag structure, the national standard stipulates that the strength of the waistband should be more than twice the strength of the base fabric, but the actual design effect is not good. The cloth cracks first. In the design, the waistband and the base cloth are made of the same strength base cloth material, which can avoid this problem.
3. Check the selection of sling materials: in the design of food-grade ton bags, the selection of sling materials is very important. The national standard clearly stipulates a safety factor of 1:6. In the actual design of food-grade ton bags, one must consider the loss of the strength of the sling during the sewing process; the other must consider the hoisting method. For example, for food-grade big bags with a load of 500kg, the sling generally uses (50-60) g/m, and the tensile force is (1300-1800) N/m; (1800-2100) N/m, the sling must meet the weaving density requirements. When designing a sling for food-grade ton bags, two rings or four rings can be used to increase the tensile strength.
4. Add auxiliaries to prolong the service life: in order to improve the anti-aging ability of plastic food-grade ton bags under sunlight, a certain amount of anti-violet agent and stabilizer should be added in the flat yarn drawing process. According to the length of the service life of the ton bag (half a year or a year), the amount of addition is determined, generally between (0.1~3)%. Some companies add anti-aging batchmate made of stabilizer, anti-violet agent and other additives, and the effect is also very good.
In the design of food-grade big bags, in order to ensure its quality, it is necessary to comprehensively consider various indicators, continuously improve the production process, and strengthen technological innovation.