Commonly used food packaging plastic bags are mostly made of polyethylene film, the film is non-toxic, so it can be used to hold food, and a film made of polyvinyl chloride, PVC itself is also non-toxic, but according to the use of the film The added additives are often harmful to the human body and have certain toxicity. Therefore, such films and plastic bags made of the film are not suitable for holding food. The following describes how to judge the raw materials of the bag making machine:
Polyethylene film (non-toxic): The film is milky white, translucent (especially observed when several layers are stacked), it is more lubricious to the touch, as if the surface is coated with a wax layer, the force is shaken, the sound is brittle, and the fire is flammable, flame Yellow, there are sticky droplets when burning, and there is a smell when the candle burns. Such as: PE
Polyvinyl chloride film (generally toxic): If it is not added with pigment, it is transparent. It feels sticky on the surface, it is hard to shake, the sound is low, it is not easy to burn in case of fire, it is extinguished from the flame, and the flame is green. Such as: PVC
Types of plastic bags: (1) High-pressure polyethylene plastic bags (2) Low-pressure polyethylene plastic bags (3) Polypropylene plastic bags (4) Polyvinyl chloride plastic bags (5) Composite plastic bags Plastic bags: Plastic bag materials : HDPE plastic bags, LDPE plastic bags, EVA plastic bags, CPE plastic bags, PPE plastic bags, OPP plastic bags, PP plastic bags, PVC plastic bags, etc.
