让我们详细讨论一下生产所用的材料 bulk bags 以及各种材料的物理特性和一般化学特性, as well as the physical properties and general chemical properties of various materials. 谢谢.

散装袋的材料是什么?

两种材料, 聚丙烯, 聚乙烯, 聚丙烯是一种通过聚合丙烯制成的热塑性树脂

聚丙烯是一种无毒的, 无味无臭的乳白色高结晶聚合物，密度仅为 0.90 — “0.91g/cm3. 它是目前最轻的塑料之一.

聚丙烯具有良好的耐热性. 产品可以在超过 100 ℃的温度下进行灭菌，并且在 150 ℃下不会在没有外力的情况下变形. 由于收缩率大 (1% ~ 2.5%), 厚壁产品容易下垂, 并且很难满足某些要求高尺寸精度和良好表面光泽的部件的要求. It is very stable for water. Its water absorption is only 0.01%, and its molecular weight is about 80.15 million.

Polyethylene is generally a thermoplastic resin made of ethylene by polymerization.

Polyethylene is odorless, non-toxic, waxy and has excellent low-temperature resistance (the minimum operating temperature can reach – 100 ~ – 70 ° C). High-density polyethylene (HDPE) is commonly known as low-pressure polyethylene. Compared with LDPE and LLDPE, it has higher temperature resistance, oil resistance, steam permeability resistance and environmental stress cracking resistance. In addition, it has good electrical insulation, impact resistance, and cold resistance

Processing technology

Generally, these two kinds of raw material particles or powder are purchased in the production of the bulk bags. They are heated and stirred in the factory formula, drawn and shaped, then cut into the required raw silk, and then spun into the required or commonly used bulk bag base cloth by using a circular loom for standby

If you customize bulk bags, you can cut and sew these textiles forming base cloth into various specifications of the bulk bags. Generally, most of them are made of polypropylene. Occasionally, high-pressure polyethylene is used by companies that produce plastics or raw materials. The outer edge of bulk bag is generally coated with low-pressure polyethylene film to achieve the purpose of waterproof, so the basic material of the bulk bag is For those with these materials, it is generally necessary to add some other auxiliary materials to the ingredients in the production process.