Paper materials can give people a sense of environmental protection, so some manufacturers pursue the visual high-end of food packaging bags. The main role of paper in paper plastic composite materials is to give people a visual sense of paper and improve the stiffness of packaging materials. It has no actual contribution to the barrier and peel / heat sealing strength of packaging materials, but sometimes it is unfavorable.
The separation and recycling of composite flexible packaging is still a difficult problem at present. It is not as easy to recycle and reuse as the single material of plastic. The environmental pollution of the waste from the composite flexible packaging of food packaging bags has aroused widespread concern of the society. As a single material, paper can be recycled from time to time, but after compounded with plastic, it becomes a composite soft packaging waste which is difficult to be recycled.

It is not good for food packaging bags to be insensitive to the pursuit of vision and excessive packaging, resulting in waste of resources or misunderstanding of consumers.

At present, the kraft paper of paper plastic melon seed bags generally weighs 50-60 grams, and the white paper for salt bags generally weighs 27 grams. Its role in crossing the river does not increase the protection of commodities. It neither conforms to the principle of low-carbon reduction nor is conducive to the recycling of waste. It is also called "false environmental protection".