The degradation process of light-degradable plastic express bags is under the action of natural sunlight, after a period of time and contains one or more steps, which leads to significant changes in the plastic chemical structure of express bags and loss of certain properties (such as integrity, molecular weight, structure and Mechanical strength) and/or breakage.
Photodegradable plastic eco-friendly express bags require light conditions for degradation, and after plastic waste is discarded, it is either left in a closed garbage disposal system (incineration, landfill, composting, etc.), or exposed to the natural environment with unstable conditions However, it is difficult to guarantee the fixed conditions required for the degradation of the photodegradable plastic environmentally friendly express bags. Therefore, in most cases, the photo-degradable plastic environmentally friendly express bags cannot be completely degraded either in the garbage disposal system or in the natural environment due to limited conditions.
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