Many people think that plastic packaging bag is not environmentally friendly, actually this is not entirely true. Yes, many plastic packaging bags on the market are made of materials that are difficult to degrade, and this kind of packaging bag is indeed not environmentally friendly. However, with the rapid development of packaging industry, the innovation of material application technology and people's increasing attention to the concept of environmental protection, more and more plastic bags are made of environmentally friendly materials.

If according to the production of raw materials, then the environmental protection of plastic bags mainly three categories: degradable plastic, edible plastic and recycled plastic.

First, degradable plastics

Degradable plastic refers to the plastic which in the production process with a certain amount of additives (such as starch, modified starch or other cellulose, photosensitizer, biodegraded, etc.), the stability of the plastic is reduced, easier to degrade in the natural environment. Biodegradable plastics are further divided into four main categories:

1. Photodegradable plastics

Adding photosensitizer to the plastic makes the plastic decompose gradually under sunlight. It belongs to an earlier generation of degradable plastics, and its disadvantage is that the degradation time is unpredictable due to sunlight and climate change, so the degradation time can not be controlled.

2. Biodegradable plastics

It needs to be kept dry, do not need to avoid light, a wide range of applications, not only can be used for agricultural mulch, packaging bags, and widely used in the field of medicine. With the development of modern biotechnology, biodegradable plastics have been paid more and more attention, and have become a new generation of hot research and development.

3. Photodegradable/biodegradable plastics

It is a kind of plastic with the combination of photodegradation and microorganism. It has the characteristics of photodegradation and microorganism simultaneously.

4. Water degrades plastics

Adding water absorbent material in plastic, it can be dissolved when it is used up and left in water, mainly used in medical and sanitary appliances (such as medical gloves), easy to destroy and disinfection treatment.

Two, Edible plastics

 Edible plastic is a kind of edible packaging, that is, edible packaging. Generally composed of starch, protein, polysaccharide and fat compound substances, widely used in such as plastic wrap, packaging film, pastry packaging, food packaging, seasoning packaging and so on.

With the development of modern food industry, food packaging is constantly updated, a new type of food packaging technology materials that can improve the contradiction between packaging materials and environmental protection - edible packaging stand out. Edible packaging material refers to a special packaging material that can realize the functional transformation of packaging material that can be transformed into a kind of edible raw material for animals or people after the function of packaging is realized. Edible packaging material is a kind of packaging without waste, is a kind of resource-based environmental protection packaging material.

Three, Recycled plastics

Recycled plastic is the reuse of plastic, through the mechanical blade grinding operation, so as to complete the reuse of plastic. The best thing about recycled plastic is that it's definitely cheaper than new. Although its overall performance and properties are not as strong as the new material, in the production of many products, we do not need to use that kind of material with good properties and properties to make it, so as to avoid wasting a lot of unnecessary properties.  Recycled materials according to different needs, only need to process a certain aspect of the property, can produce the corresponding products, so as not to let the loss of resources.

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