It’s hardly to say from when everything has an expiry date. Fish will expire, canned meat will expire, and even wrapping paper will expire. Is there anything that will never expire? Any food has a shelf life, seven or eight years, or one or two days, which will be marked clearly on plastic pack food bag. But does a plastic bag itself have a shelf life? The answer is yes. Plastic bags indeed have a shelf life. Except for preservation bags, preservation boxes, washbasins and other plastic products have a shelf life, which varies due to different uses and specific ingredients. Most plastics have a shelf life of 2 to 4 years.
Major reasons for expiration of plastic bags
1. Qualitative change in plastic pack bag
As time goes by, some hard plastic changes can be found with naked eyes, such as yellowing, brittle, and cracks, etc., which are signs of plastic expiration. But it’s difficult to see performance changes in preservation bags, garbage bags, composite bags and other soft plastics through naked eyes. When some plastic bags stick together and cannot be torn apart, or discoloration or color fading of printing patterns occurs for some plastic bags, which is a sign of deterioration of plastic pack food bag. So these kinds of bags can no longer be used.
2. Shelf life of food
Some plastic pack food materials can be recycled currently on the market, but if the food wrapped in plastic bags expires, the plastic bags are generally directly discarded, and few people will recycle the or reuse them. So it can be said that the shelf life of food is the shelf life of plastic pack food bag.
3. Factors affecting the expiration of plastic bag
Temperature, humidity and other factors will directly affect the shelf life of plastic packaging bags. Although most plastic bags do waterproof treatment, the bags are easy to stick together, and the surface is also easy to breed bacteria in a humid environment. Even if the performance has no problem, the bags expire, and continuous use may affect the quality of food. In addition, light will also affect the quality of bags. The ink color of printed plastic pack food bag will fade or even disappear after long exposure to strong light environment.
Post time: May-09-2022