Food safety testing methods for liquid packaging bags.digital flexible packaging

Liquid packaging bags not only require a beautiful appearance and convenience to carry, but more importantly, they need to improve quality to ensure food reliability. This puts forward higher requirements for the functionality of food packaging materials themselves, whether they are green and environmentally friendly, and the production process. So how do you determine whether liquid packaging bags are reliable? Let's take a look together.

1、 Fire detection method: Non toxic polyethylene plastic bags are flammable, with a blue flame and a yellow upper end. When burned, they drip like candle tears, have a wax smell, and emit less smoke; Toxic polyvinyl chloride plastic bags are non flammable and extinguish when left on fire. The flame is yellow and the bottom is green. They can soften and stretch, announcing the irritating taste of hydrochloric acid.

2、 Vibration detection method: Grasp one end of the plastic bag with your hand and shake it vigorously, declaring that the person with a loud sound is non-toxic; Those with dull and astringent voices are toxic.

3、 Water testing method: Place plastic bags in water and press them into the bottom. Non toxic plastic bags have a small specific gravity and can surface, while toxic plastic bags have a large proportion and sink.

4、 Sensory testing method: Non toxic plastic bags are milky white, semi transparent, or colorless and transparent, with flexibility, a smooth feeling when touched, and a waxy appearance; Toxic plastic bags have a cloudy or light yellow color and a sticky feel.

Nowadays, the plastic food bags we use in daily life mainly include polyester, polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc. Among them, polyethylene and polypropylene are reliable plastics that can be used to hold food. Most PVC plastic bags are toxic and cannot be used to pack food. Due to the toxicity of the unpolymerized vinyl chloride monomer in polyvinyl chloride resin to the human body. Moreover, during the process of processing polyvinyl chloride resin into plastic bags, toxic auxiliary materials such as plasticizers and pigments are also involved. The main component of plastic stabilizers is lead stearate, which is also toxic. This type of lead salt is easily distinguishable, and once it enters the human body, it can form stored lead poisoning.

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