Plastic packaging bag is a kind of packaging bag that uses plastic as raw material to produce various supplies in daily life. It is widely used in daily life and industrial production, but the convenience at this time brings long-term harm. Commonly used plastic packaging bags are mostly made of polyethylene film, which is non-toxic, so it can be used to hold food. There is also a kind of film made of polyvinyl chloride, polyvinyl chloride itself is non-toxic, but the additives added according to the purposes of the film are often harmful substances to the human body and have certain toxicity. Therefore, this kind of film and the plastic bag made of this film are not suitable for holding food.
Food plastic packaging bags are often used in people's lives, but you must be careful when using them. Some plastic packaging bags are poisonous and cannot be used to directly hold food.
1. Observation with eyes
Non-toxic plastic bags are white, transparent or slightly transparent, and uniform in texture; toxic plastic bags are colored or white, but have poor transparency and are relatively turbid, and the plastic surface is unevenly stretched and has small particles.
2. Listen with your ears
When the plastic bag is shaken vigorously by hand, the crisp sound indicates that it is a non-toxic plastic bag; while the sound is small and dull, it is a toxic plastic bag.
3. Touch with your hands
Touch the surface of the plastic packaging bag with your hands. If it is smooth, it is non-toxic; if it is sticky, astringent, and waxy, it is toxic.
4. Smell with your nose
Non-toxic plastic packaging bags are odorless; those with pungent smell or abnormal taste are poisonous.
Five, submersion test method
Put the plastic bag into the water, press it to the bottom of the water with your hands, wait a moment, the non-toxic plastic bag will surface, and the toxic plastic bag will sink to the bottom.
6. Combustion method
Non-toxic plastic bags are flammable, the tip of the flame is yellow, partially blue, dripping like candle tears when burning, and has a paraffin smell; toxic plastic bags are not easy to burn, extinguish immediately after leaving the fire, and the flame tip is yellow or black , the bottom is green, it can be softened and drawn, and you can smell a pungent smell.
Suzhou YingYang Packaging Technology Co., Ltd. is a professional Plastic Bag Factory. If you need it, you can click the official website to contact us. We would like to answer more information for you.