Is there a shelf life for biodegradable plastic bags?

　　Biodegradable plastic bags are biodegradable. When customers customize biodegradable plastic bags, they will worry about whether the biodegradable plastic bags have a shelf life or not? Can the biodegradable bags beyond the shelf life be used again? And other relevant issues. The manufacturer of biodegradable shopping bags will provide answers.

　　Biodegradable plastic bag material is composed of PLA (polylactic acid) and PBAT (poly (adipic acid)), which are recognized as environmentally friendly materials and harmless green products. Under the condition of composting degradation, biodegradable plastic bags can be fully biodegradable within 180 days. The degradation products are carbon dioxide and water, which can be directly absorbed by plants in the soil, returned to the soil, or entered into the general environment, and can be degraded without pollution to the environment. It really comes from nature and belongs to nature.

　　The use of biodegradable plastic bags has greatly reduced the environmental pollution of plastic products, and truly achieved green, healthy and safe use.

　　The required degradation time of biodegradable plastic bags is related to the environment. In the general daily environment, even if the time exceeds six to nine months, the bags will not decompose and disappear immediately. However, the physical properties of biodegradable bags begin to change when the appearance remains unchanged, and the strength and toughness gradually deteriorate with time. These are all signs of degradation.

　　Biodegradable plastic bags cannot be stored in large quantities, but can only be purchased in an appropriate amount. The storage requirements are to keep them clean, dry, and not exposed to direct sunlight, and pay attention to the first in first out storage management principle. Therefore, there is a contradiction for biodegradable plastic bags, which is that it is impossible to require fast degradation and long storage time. Biodegradable plastic bags can be degraded into carbon dioxide and water within 180 days under natural or industrial composting conditions, which will not pollute the natural environment.

　　The white pollution caused by plastic bags is becoming more and more serious, which has been highly valued. The state has issued a new plastic ban order. Degradable plastic bags have become the choice to solve the problem of white pollution and the substitute of traditional plastic bags. Although degradable plastic bags are not yet popular and the cost is relatively high, Shunxingyuan Packaging, a professional flexible packaging manufacturer, believes that it is better to use degradable plastic bags, which are both environmentally friendly and practical.

　　Degradable plastic bag refers to a plastic bag whose properties can meet the performance requirements, remain unchanged during the storage period, and can be degraded into environmentally friendly substances under natural environmental conditions after use.

　　The degradable plastic bag has its advantages in performance, practicability, degradability and safety. In terms of performance, degradable plastic bags can achieve or exceed the performance of traditional plastics in certain specific fields; In terms of practicality, degradable plastic bags have similar application performance and hygiene performance with similar traditional plastic bags; In terms of degradability, degradable plastic bags can be quickly degraded in the natural environment (specific microorganisms, temperature, humidity) after use, and become easily used fragments or non-toxic gases to reduce the impact on the environment; In terms of safety, the substances produced or left in the degradation process of degradable plastic bags are harmless to the environment and will not affect the survival of human beings and other organisms. At present, the major obstacle to replace traditional plastic bags is that the production cost of degradable plastics is higher than that of similar traditional plastic bags or recycled plastic bags. Therefore, degradable plastic bags have an alternative advantage in packaging, agricultural film and other applications where the use time is short, it is difficult to recover and separate, the performance requirements are not high, and the impurity content requirements are high.

　　Materials used in degradable plastic bags

　　PLA: It is one of the common degradable plastics. It is a polymer polymerized with lactic acid as the main raw material. The PLA production process is pollution-free, and the product can be biodegradable. After use, the PLA can be decomposed into carbon dioxide and water through composting at a temperature higher than 55 ° C or when the oxygen enrichment and microbial action are reduced, so as to realize the material circulation in the nature without any impact on the environment. At present, the production of polylactic acid mainly adopts the ring opening polymerization process of lactide to dehydrate lactic acid to produce oligomer, then depolymerize to produce lactide, and then ring opening polymerization to produce polylactic acid. PLA also has reliable biosafety, biodegradability, good mechanical properties and ease of processing, and is widely used in packaging, textile industry, agricultural mulch film, biomedical polymer and other industries. The disadvantage of PLA is that the degradation conditions are relatively harsh. However, due to the relatively low cost of PLA in biodegradable plastics, the consumption of PLA is in the forefront.

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