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How to deal with cement woven bags?

How to deal with cement woven bags?

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  • Time of issue:2020-11-23
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(Summary description)Plastic woven bags are made of polyethylene and polypropylene by drawing, weaving, sewing or pasting. The loading weight is generally 25-50kg.

How to deal with cement woven bags?

(Summary description)Plastic woven bags are made of polyethylene and polypropylene by drawing, weaving, sewing or pasting. The loading weight is generally 25-50kg.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2020-11-23
  • Views:0
Information

deyuan

Plastic woven bags are made of polyethylene or polypropylene by drawing, weaving, sewing or pasting. The loading weight is generally 25-50kg. {TodayHot}Because of its good tensile strength, low price and convenient transportation, it is widely used in the packaging of cement, chemical raw materials, fertilizers, minerals, grains, sugar and other powdery materials. Increasing trend.

Cement is an important building material, and its output is increasing year by year, and this year will reach more than 850 million tons. Except for part of the transportation in bulk, the rest are all packed in bags, requiring as many as 13.6 billion packaging bags, and 70% are plastic woven bags. Therefore, in the mandatory "Cement Packaging Bags" standard from the 1997 edition to the 2002 edition of the National Bureau of Technical Supervision, the composite plastic woven bag is proposed as a separate bag from the composite bag.

 In order to ensure the implementation of national standards, local inspection and quarantine departments supervise the production of plastic woven bags, issue quality licenses, and formulate standardized inspection management methods and inspection procedures. Such as the implementation of license management for plastic woven processing plants; batch inspection of the appearance of the factory plastic woven bags; periodic inspection of physical properties; implementation of batch management. This article enumerates the main problems found in management and practice in order to help the bag-making companies achieve consensus in understanding.

Regarding the aging problem of plastic woven bags, the strength of plastic woven bags is reduced by 25% in the natural environment, that is, under direct sunlight, after one week, and 40% after two weeks, and basically cannot be used. That is to say, the storage and storage of plastic woven bags is very important. In addition, after the cement is packed in plastic woven bags and exposed to direct sunlight, its strength will drop sharply; excessively high temperature (container transportation) or rain during storage and transportation will cause its strength to drop, thus failing to protect it. The quality requirements of the contents. Therefore, the transportation and storage conditions of plastic woven bags are very important. {HotTag} Therefore, GB/T8946 and GB/T8947 have clear regulations on storage and transportation conditions, that is, plastic woven bags should be stored in a cool and clean room, and transportation should be avoided from sun and rain, and should not be near heat sources. More than 18 months. In fact, plastic woven bags may age in 18 months, so the validity period of plastic woven bags should be shortened, and 12 months should be appropriate.

The relative tensile load and elongation at break of the flat yarn can be used to determine the aging degree of the woven fabric during the laminating process. Before and after coating the film, test the tensile load and elongation at break for each sampled flat yarn, and compare the test results to determine that if the technical indicators of the flat yarn do not change much before and after coating, it can be considered that there is basically no aging; if before and after coating There may be aging problems if the technical indicators of flat yarns are different. The reasons should be analyzed and the process should be improved.

Regarding the issue of recycled materials in plastic woven bags, in order to ensure the quality of packaging bags, great attention should be paid to the aging of plastic woven bags. For this reason, the competent authority of the national building materials industry once required that recycled materials and recycled materials are not allowed in the bag-making raw materials, and the amount of filling materials should be strictly limited to no more than 5%. At the same time, the temperature of the laminating film must be strictly controlled to avoid process problems. Causes accelerated aging problems. Excessive addition of recycled materials is also one of the reasons for the aging of plastic woven bags.

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