In the lifting test, because the load is 5 times that of all the collective components at the same time, the force per unit area is 5 times that of the rated load, if it can pass this test, then when the height is 0.8M and 3M in the drop test and dumping test, the rated load is in its free fall. The sum of its own weight and the acceleration of gravity is much less than the force at 5 times the load. The force assigned to the components of the whole bag is also much smaller than that at 5 times the load and from the inside out, which is not a threat to the product. In tear propagation, if the force of more than 5 times the load distributed on a part of the carrier 10CM is F, then the force distributed there when the rated load is lifted for tear propagation is 1/5F. The gravity direction of the contents of the bag body is mainly downward, and there is a certain pressure on the side wall fabric, but it is relatively small. The size of this pressure is related to the level of the content material surface, the size of the bag type surface, and the powder, granular, block and density of the content material. At the same time, this pressure is affected by the vertical and horizontal direction of the warp and weft yarn, and the end of the knife edge at 45 degrees from the vertical central axis of the bag body will respectively generate two component forces to the flat wire in the warp and weft direction of the bag body. Through more complex calculations, the size of the two component forces can be obtained, tear propagation as a part of the overall force analysis of the container bag, the discussion is more "complex", but practice has proved that at the rated load, the knife edge will not be extended.
High temperature resistant ton bag
The significance of the high-temperature ton bag test is to imitate the actual working state of the product, and the ship string ratio of the international ocean freighter is more than 0.8M or 0.3M higher than the dock, which is of little significance. If the bag really falls off during the port lifting, there are only two possibilities: one is that the port operation is wrong, and the other is that the product fails to pass the lifting test. To achieve 5 times the safety factor, two of the 4 rings or one of the 2 rings must also have a tensile performance of more than 2.5 times the rated load. In the upright test, the body of the high-temperature resistant ton bag is lying on the ground, and the two or one hanging ring on the side near the ground are hung with the hook and lifted upward until the bag body is upright and lifted off the ground, and the bag body will not have problems. When the bag is lifted off the ground, due to the tilt action of the single ear lifting, a non-vertical component will be generated to destroy the structure of the ring root. The magnitude of this component is related to the slope of the bag body, and the relative position of the inner packing plane and the sewing place at the ring root. Generally, this tearing force is equivalent to 20-25% of gravity and does not pose a threat to a sling that can withstand the test of a 5x safety factor.
In summary, there are more overall test methods in the "International", which cover each other in function, and the test is complex, and all of them are important veto items in standard tests. The whole bag test is more, the test cycle is long, and the test cost is high, which is not suitable for the fast pace and low cost of today's society. In the contract environment, it has the function of simple, clear and rapid quality judgment of products, which is the direction of current standard development.
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