With the current global bans and restrictions on plastics, plastic-free or degradable has become an inevitable trend in the future. The treatment method of ordinary plastics is still incineration and cremation, causing a large amount of greenhouse gases to be discharged into the air, while disposable degradable lunch boxes are It is buried in the soil to degrade, and the carbon dioxide produced directly enters the soil organic matter or is absorbed by plants, and will not be discharged into the air and will not cause the greenhouse effect.
Today, let us take stock of the disposable degradable lunch boxes on the market.
1. Pulp molded lunch box (plant fiber molded tableware)
Pulp molded tableware products have certain advantages on the road of banning plastics. First of all, in terms of raw materials, pulp molded disposable lunch boxes use wheat straw, bagasse and other plant fibers as raw materials, without adding any PP materials, and are molded through pulp It is formed by wet pressing process, and food-grade additives such as water-proof and oil-proof are added to the pulp to achieve the effect of holding hot and cold food.
Plant fiber biodegradable lunch boxes are currently the most active type of lunch boxes on the market. Take Hainan Province, which is the first to ban plastics, as an example, Hainan Province has completely banned the use, circulation, sales and storage of plastic tableware. Pulp molded tableware is undoubtedly an ideal plastic substitute.
The sugarcane pulp disposable lunch box is a fully degradable lunch box, which can be completely degraded into organic matter under the conditions of industrial composting or household composting in 90 days, returning to nature.
2. Corn starch-based lunch box
The cornstarch degradable lunch box is made of natural cornstarch and plant fiber as the base material, supplemented by biopolyester, polyol and other materials.
Corn starch lunch boxes can be degraded naturally in the soil and natural environment, and the degradation rate can reach 60%-80% according to the composition of the lunch boxes, which can replace plastic products to a certain extent and reduce white pollution to the environment. It is an ideal substitute for the "sterilized tableware" that is commonly used in the catering market but has been controversial.
3. PLA biodegradable tableware
The PLA degradable lunch box usually refers to the product that combines the PLA composite film and the pulp molded product in the pulp molding process, that is, the PLA film-coated product.
PLA composite film is a completely degradable film produced and processed from polylactic acid, which can be compounded on pulp molding and paper products by heating.
Polylactic acid (PLA) is a new type of biodegradable material, made from starch raw materials proposed by renewable plant resources (such as corn). Starch raw materials are saccharified to obtain glucose, which is then fermented by glucose and certain strains to produce high-purity lactic acid, and then a certain molecular weight polylactic acid is synthesized by chemical synthesis. It has good biodegradability and can be completely degraded by microorganisms in nature after use, and finally carbon dioxide and water are generated without polluting the environment. This is very beneficial to environmental protection and is recognized as an environmentally friendly material.
In view of the advantages of PLA, after the filming process is combined with the pulp molded product, not only can the use of water and oil repellent be saved, but also can better seal the pores of the pulp molded product, making it impossible to prevent alcohol The product can prevent alcohol leakage. At the same time, after the air holes are sealed, the tableware reduces the air permeability of the product during actual use, and the heat preservation performance is higher and the heat preservation time is longer.
