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Since the promotion of fee plastic bag in supermarkets is unpopular, whether we should try to promote the bags with biodegradable materials? Recently, the experts in environmental plastic packaging R & D calls for promoting the biodegradable bags into supermarkets and farmers markets. Currently there are basically three types of rept bags which can be used as environmentally friendly bags: completely biodegradable type, biodegradable type and photodegradation plastic bags. The first environmental pocketed mass production, large scale is not yet possible, the other two bags technology is more mature, and the possibility of promotion will be much larger. Biodegradable bags are a polyethylene-based plastic with mixing starch and other biodegradable agents. Bags discarded in the field after the degradation of the starch contained in a plastic bag, in the short term rapid degradation by enzymes secreted by the microorganisms in the soil or garbage generated empty, resulting in decreased mechanical properties of products, along with the empty generated surface area to expand increase its contact with the soil surface. Photodegradation plastic bags are also based on polyethylene plastic and degradable plastic bags made by the agent and calcium carbonate mineral powder mixing light. When such plastic bags discarded in the field, add a small amount of light degradation agent in the light of biodegradable plastic bags, in the role of sunlight will lead to fracture of the polyethylene molecular chain degradation into low molecular weight substances due to filling carbonated non-metallic minerals such as calcium or talc powder, allows film photodegradation time, whether incineration or landfill are likely to be environment-consumptive use. Since the bags biodegradable materials have been mature, but also benefit the environment, why businesses did not want to use it? An environmental protection expert, said: part toughness than ordinary plastic bags, recycle PET bag sets of two plastic bags in the face of heavy goods, the total accounted for down to 1/3 than in the past. Biodegradable plastic bags cost 20% more than ordinary plastic bags. The photo degradation is 15% more expensive than the ordinary. Promote the concept of environmental protection at the same time, many supermarkets would rather choose not to provide plastic bags, out of money by the consumers themselves using plastic bags. Willing to spend money to buy the more expensive environmentally friendly plastic bags provided to consumers businesses are becoming less and less. A large furniture stores last year introduced charges for plastic bags has caused a lot of people off, the reason here. To promote the use of biodegradable plastic bags must be on the technical and economic clearance to be able to have quite similar ordinary plastic bags, or similar application performance and health performance, use function under natural environmental conditions than fast degradation of residual material in the generation and degradation of the natural environment are harmless or potentially harmful. The price to be able to gradually flat and similar ordinary plastic bags. The waste disposal method is junk move in most regions of China. Because ordinary plastic bags, boxes, cups, groceries are more difficult to degrade, they are flying around encountering strong winds and form the landscape of white pollution. If they are replaced by the degradable plastic, it will produce less rubbish in the short term and so we can reduce or mitigate the environmental pollution. The majority of the public are against supermarket plastic bag charges. So the relevant departments now change their practices. Currently they are working for promoting the biodegradable plastic bags. In future, at least more than half of the supermarkets will use environmental plastic bags. Source: http:// www.cnmhc.com
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