Disposable fast food box, because of convenient use and by people's love, can be seen everywhere in daily life. The one-time fast food box on the market at present is the raw material of polystyrene that abstruse in petroleum adds foaming agent mostly, heat foamy and become. Polystyrene is a kind of widely used polymer material, which has the characteristics of low toxicity, high melting point, strong plasticity and easy production, so it has become the preferred material for making disposable fast-food box.
However, the degradation cycle of polystyrene meal boxes is extremely long, and it can last up to 200 years in the ordinary environment. In other words, they keep their polymer form unchanged for a long time. So what to do with all those discarded lunch boxes? Burning? I can't. When they burn, they will produce more than 10 kinds of toxic gases, directly causing air pollution; Buried? Also not line. In order to make the material into shape, various additives must be added in the production process. Over time, some of the toxic additives will gradually be released, causing damage to the soil and water resources. What about recycling? Unfortunately, their renewable value is extremely low, not to mention every day to recycle so many large, small quality lunch boxes is what a huge project ah! Not only so, used as a foaming agent freon was recognized by the scientific community to cause irreversible damage to the earth's atmospheric ozone layer "culprit". Visible from this, of disposable plastic eat box degrade hard is to cause "white pollution" one big culprit. Moreover, freon, used as a foaming agent, was recognized by the scientific community as the "culprit" of irreversible damage to the earth's atmospheric ozone layer.
Single-use plastic lunch boxes can wreak havoc on the environment, so are they absolutely harmless? The facts tell us that the answer is not. Polystyrene, the ingredient used to make disposable plastic lunch boxes, is a cancer-causing environmental hormone, according to a new study. Experiments have shown that this kind of tableware can trigger the production of Dioxin at high temperatures below 65℃, which is the "most vicious" carcinogenic substance constantly mentioned by the media not long ago.
Visible, disposable plastic lunch boxes have great harm to both the environment and health. With the further improvement of people's environmental awareness and their own health awareness, more and more people refuse to use the fast food box made of polystyrene, some new environmental protection lunch boxes have emerged. The following is a brief introduction of several environment-friendly lunch boxes and their advantages and disadvantages:
A, the paper carton
Paper is the most familiar kind of material. "Paper instead of plastic" naturally became the first plan people thought of. Using paper instead of plastic technology that uses paper pulp as raw material, forming and drying in the mold to produce disposable tableware. Advantages: the tableware made by this method is called "environmental protection product" because of its non-toxic, harmless, easy recycling, renewable use, degradable and other advantages. It is an alternative technology with a better comprehensive evaluation at present. Disadvantages: From the paper production and use of the whole process of evaluation, the technology also has shortcomings. First, the production of pulp needs a lot of forest resources, and China's forest resources are limited, a large number of deforestation caused soil erosion, which does not conform to China's national conditions; On the other hand, pulp can cause serious water pollution during production, in some cases even more than plastic. Therefore, from a macro point of view, paper instead of plastic technology can not completely eliminate environmental pollution, but the environmental pollution of tableware to the production of lunch box. Moreover, the high production cost of paper pulp makes the price of paper tableware produced by paper pulp relatively high, so replacing plastic with paper is not a perfect solution.
Two, plant fiber meal box
The technology is based on plant fiber, such as straw, straw, bagasse, etc. after broken to get fiber powder, and then mixed with a certain amount of glue or resin, and then injected into the mold under high pressure and high temperature molding. Advantages: The products produced by this technology have good degradability and rich raw materials. Disadvantages: The appearance and color of disposable tableware produced by this technology is unsatisfactory because the fiber pigment is not removed in the production process (because to remove the pigment must take chemical bleaching method, which is bound to cause water pollution).
Three, biodegradable lunch box
Biodegradable lunch box is an advanced environmental protection product. It takes starch as the main raw material, adds annual long-term plant fiber powder and special additives, and makes biological full degradation fast-food box through chemical and physical processing. Advantages: As starch is a biodegradable natural polymer, it is decomposed into glucose and finally into water and carbon dioxide under the action of microorganisms. In addition, the material it blends with is also fully degradable, so it can be said that it has no impact on the environment. The main source of raw material starch production can be corn, potatoes, sweet potato, cassava and other annual long-term plants. Disadvantages: Biodegradable lunch boxes are not perfect, for example, most of the production materials are food crops, and there are mildew and other problems to be solved.
