The bag manufacturer produces the bag to stop the addition of recycled material, because it involves safety problems. We know that although polypropylene has good mechanical properties, its ability to resist natural aging is very poor. If the bag manufacturer wants to maintain a relatively long term use performance, it is an inevitable choice to join the additives scientifically and reasonably. If recycled material is used, one is that the composition is difficult to control, and the performance of the finished product is not easy to grasp. The two is that the molecular chain is plasticized at two times and even plasticized many times, even if the effect of adding "antiaging agent" is uncontrollable.

Manufacturers of container bags to prevent AIDS should be wavelength sensitive wavelength of all raw materials; 6. to determine the appropriate stretching ratio, on the premise of meeting the strength requirements, maintain adequate elongation, and tend to the same; 7. finished fabric is relatively thick, relatively small performance loss; aging is better than no 8. film laminating materials anti PE material, film is better than that of PP film; 9. smooth product surface is better than surface folds; 10. elongation (appropriate) large to small elongation; 11. fiber tenacity than fiber; 12. product anti-aging properties according to the determined by climate characteristics. First of all, to meet the safety factor, the base cloth should have a high strength, but not the higher the strength of the base cloth. On the basis of the specific weight of the base cloth, it is under the general rule that the pulling force and the elongation are inversely proportional. The flat should be woven with good elongation in the pursuit of absolute tension at the same time, there is no good elongation, excessive pursuit of tension would be counterproductive, the aging performance of products will be greatly reduced.

When the bag manufacturer does not add auxiliaries, the elongation is one of the main indexes to judge the property of the fabric. The strength of the base cloth is determined by design. In the predetermined width, the amount of tension per filament can not be equal to the measured strength of the base cloth, and there will be a loss of 5% to 15%. This difference is related to the degree of equipment structure, new and old, and flat material melt index (material hardness), ratio and technological way. In addition, the latitudinal ratio is relatively larger than the meridional strength loss.

Anti natural aging is a cold door subject involving many theories and complex mechanisms. I am not in the deep, but anti aging, is a woven products slightly understanding, in "China plastics" in 1998 seventh, "a polypropylene fabric anti natural ageing study of" discussed the problems about the mechanism and effect of once. The main idea is that the 1. fabric adding anti-aging agent and adding anti-aging agent, there are obvious differences between the use effect; 2. domestic container manufacturers have several well-known brands of raw materials in all without additives under the condition of relatively strong performance than the general raw materials to add some additives in raw materials; 3. is important, to stir, but also to ensure that it can enter the cylinder; 4. auxiliary ratio should be appropriate, less obvious effect, more is a waste; 5. grades to appropriate stabilizer.