With the improvement of people’s living standards, people’s requirements for food quality are getting higher and higher. As the direct outer packaging of food protection, the safety of food bags has attracted more and more attention from the world. Food bags are not only required to be beautiful in appearance and easy to carry, but more importantly, to improve the quality to ensure food safety. This puts forward higher requirements for the performance of the food packaging material itself, whether it is green or not, and the production design and production process of the packaging. Nowadays, the plastic food bags we use every day mainly include polyester, polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc. Among them, polyethylene and polypropylene are safe plastics that can be used to hold food. Most PVC plastic bags are toxic and cannot contain food. Because the unpolymerized vinyl chloride monomer in the polyvinyl chloride resin will be toxic to the human body. Moreover, in the process of processing polyvinyl chloride resin into plastic bags, some toxic auxiliary materials such as plasticizers and pigments are also added. The main component of plastic stabilizer is lead stearate, which is also toxic. This lead salt is easily precipitated, and once it enters the human body, it will cause accumulated lead poisoning. So, how to tell if plastic food bags are poisonous? China YLTpacking Packaging Products Co., Ltd., which specializes in the production of food packaging bags, teaches you the following detection methods. Sensory detection method: non-toxic plastic bags are milky white, translucent, or colorless and transparent, flexible, feel lubricated when touched, and the surface seems to have wax; toxic plastic bags are cloudy or light yellow, and feel sticky . Water detection method: Put the plastic bag in water and press it into the bottom of the water. The non-toxic plastic bag has a small specific gravity and can float to the surface. Shaking detection method: Grab one end of the plastic bag with your hand and shake it vigorously. Those who make a crisp sound are non-toxic; those with a dull sound are poisonous. Fire detection method: non-toxic polyethylene plastic bags are flammable, the flame is blue, the upper end is yellow, drips like candle tears when burning, has paraffin smell, and emits less smoke; toxic polyvinyl chloride plastic bags are not flammable, It is extinguished immediately after leaving the fire. The flame is yellow and the bottom is green. It softens and can be drawn, and emits a pungent smell of hydrochloric acid.
- The difference between biodegradable bags and ordinary PLA stic bags January 30, 2023