Now it is very popular on the market to pack liquid and some powdery objects with suction bags, mainly becauseThe mouthpiece bag is convenient to seal and can be reused, which reduces the cost of packaging supplies while ensuring hygiene and safety. Therefore, more and more products are considering the use of nozzle bags for packaging. In this way, what kind of raw materials are used to manufacture the nozzle bags to be environmentally friendly, non-toxic and low-cost, which has become the most concerned issue for everyone. The following is an introduction. Let’s take a look at what raw materials are used to make the mouthpiece bag the most environmentally friendly!Liquid spout bags have a lower density:PEThere are two types of resins: high density and low density. higher densityPEThe molecular branch is less, the regularity of the molecule is better, and the crystallinity is better.PEThe obtained film has high mechanical strength, but poor transparency, especially the heat shrinkable film made from it, the shrinkage of the constant temperature shrinkage curve, the narrow high temperature insensitive area, and the poor shrinkage performance. When polyethylene heat shrinkable film, the polyethylene with lower density should be selected (generally the density is0.920~ 0.925g/cm3of polyethylene).When the melt flow rate is low, the molecular weight is high, and there are many entanglement points between the molecules. When used to produce heat shrinkable films, the beverage spout bag is easy to form in the film and retain forced elastic deformation, resulting in greater shrinkage. Rate. Therefore, when manufacturing polyethylene heat shrinkable films, it is better to choose polyethylene with a lower melt flow rate, and the melt flow rate of polyethylene used in heat shrinkable films should generally not be greater than5g/10min, preferably in1.0one,10minthe following.The shrinkage of the film is related to the molecular weight distribution of the resin. Generally speaking, the wider the molecular weight distribution, the better the heat shrinkage performance. Therefore, if conditions permit, bimodal polyethylene resins are best used when producing heat shrinkable films.
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