News

Company News

Industry Information

Design considerations for container bags

Release time:

2021-07-31

First of all, in order to meet the safety factor, the base fabric should have a higher strength, but not the higher the strength of the base fabric, the better. On the premise of a specific base cloth weight, under the general law of tension and elongation are inversely proportional. The flat wire for weaving should maintain good elongation while pursuing tensile strength. Without good elongation, excessive pursuit of tensile strength will be counterproductive, and the aging performance of the product will be greatly reduced. In the absence of additives, elongation is one of the main indicators to judge the performance of the fabric. Once the strength of the base fabric is determined by design, the sum of the pulling force of each monofilament cannot actually be equal to the measured strength of the base fabric at the predetermined width, and there will be a weaving loss of 5%-15%. This is related to the difference of equipment structure, old and new degree, and also related to the melting index of raw materials (soft and hard materials), ratio and process mode of flat wire. In addition, the strength loss in the latitudinal direction is relatively larger than that in the longitudinal direction.

Secondly, the production of container bags must resolutely eliminate the addition of recycled materials, because this involves safety issues. We know that although polypropylene material has good mechanical properties, its ability to resist natural aging itself is very poor. If you want to maintain a relatively long-term performance, scientific and reasonable addition of additives is an inevitable choice. If the use of recycled materials, one is difficult to control the composition, the finished product performance is not easy to grasp. The second is that the molecular chain is plasticized twice or even repeatedly, even if the "anti-aging agent" effect is uncontrollable.

Third, anti-natural aging is an unpopular subject involving many theories and complex mechanisms. Many people are not deeply involved, but it is about anti-aging of plastic woven products. In the 7th issue of "China Plastics" in 1998, there was an article "Preliminary Study on Anti-natural Aging of Polypropylene Fabrics" discussing the mechanism and effect. The main points are:

1, the fabric to add anti-aging agent and do not add anti-aging agent, the use of the effect is significantly different;

2, there are several domestic brands of raw materials in the case of no additives, than the general raw material performance is relatively strong;

3. The means of adding additives to the raw materials is very important, not only to stir evenly, but also to ensure that it can enter the barrel;

4, the proportion of additives should be appropriate, less effect is not obvious, more is a waste;

5, stabilizer grade should be appropriate. The wavelength to be prevented by the additive should be the sensitive wavelength of all raw materials;

6, determine the appropriate stretch ratio, in the premise of meeting the strength requirements, maintain sufficient elongation, and make it consistent;

7. When the finished fabric is relatively thick, the performance loss is relatively small;

8. The aging resistance of the film material is better than that of the non-film material, and the PE film is better than the PP film;

9, the product surface is better than the product surface is wrinkled;

10, elongation (appropriate) is better than the elongation of small;

11, the strength of the fiber flat wire is lower than that of the non-fiber;

12. The anti-aging performance of the product should be determined according to the climatic characteristics of the area where it is used.

A brief introduction to the software platoon

What are the types of automotive interior plastics?

A brief introduction to the software platoon

What are the types of automotive interior plastics?

Recommend News

Container liner bag texture how?