With the improvement of people’s quality of life, the requirements for the living environment are also higher, and some environmentally friendly daily necessities have also been born. PLA stic bags have evolved from ordinary PLA stic bags to the current biodegradable PLA stic bags. In this process, there is actually another development direction, which is water-soluble PLA stic bags.Water-soluble PLA stic bags were developed earlier than biodegradable PLA stic bags because they are easier to degrade than biodegradable PLA stic bags and have lower environmental requirements for degradation.Water-soluble PLA stic bags are safe, non-toxic, non-irritating, and easy to degrade. When dissolved in water, they degrade into water and carbon dioxide, which can be excreted by the human body after being absorbed by the body; it is also resistant to oil and corrosion, anti-static, good toughness, and heat-sealable. Strong, clear printing and other advantages, so its prospects should be very good.But why is it so little known, at least in the bag industry? In fact, it failed to develop in the market because it was too easy to degrade. As a packaging bag, it responds to a variety of environments, one of which is unavoidable is a humid environment or even direct water. Its easy degradation limits its use, and the cost factor is also a reason that cannot be ignored. Its cost is generally much higher than that of ordinary PLA stics or even biodegradable materials.Therefore, for packaging bags, its development direction is ultimately biodegradable materials. Packaging bags made of biodegradable materials can basically re PLA ce ordinary PLA stic bags in terms of performance, and now they have entered the stage of large-scale marketization. I believe that with the development of the market, biodegradable bags can re PLA ce ordinary PLA stic bags. .