Technical Requirements and Quality Identification of Biodegradable Trays
The biodegradable trays for food refer to cutlery that can undergo biochemical reactions under the action of microorganisms (bacteria, fungi, algae) and enzyme in the natural environment, causing changes in appearance and internal quality and ultimately forming carbon dioxide and water.
Biodegradable trays for foods are made of two types of materials: one is natural materials such as paper, straw, and starch, which are degradable and also called environmentally friendly products; the other is mainly composed of plastic and added with starch and photosensitizers.
Appearance of compostable trays for foods
Normal color and no peculiar smell;
Surface is flat, clean, even in texture, without scratches, wrinkles, peeling, breakage, or puncture;
Surface is free of oil stains, dust, mold, and other foreign matter;
The edge of the compostable trays for food is smooth and regular. The cover with a convenient and flat sealing design should be able to close tightly.
Technical requirements of compostable trays for foods
Raw materials that comply with national food hygiene and environmental protection regulations and standards must be used to produce disposable degradable tableware that is non-toxic, harmless, clean, and pollution-free. The following raw materials, adjuvants, coatings, and chemical agents cannot be used to make or process disposable degradable tableware:
Untreated natural materials and their rough processing products;
Expired, deteriorated, or contaminated materials;
Harmful substances that do not meet hygiene standards;
Fluorescent whitening agents.
The green and environmentally friendly packaging of compostable trays for foods should meet three requirements: easy to recycle, easy to dispose of, and easy to blend into the natural environment. However, even with biodegradable trays for foods, it is not easy to achieve a short-term degradation. Many degradation products claim to degrade in three to six months, but this is determined under laboratory standard conditions. The degradation of the products is affected by multiple factors such as temperature and humidity in natural environments. For example, if you put a lunch box in a place without water, it is difficult to degrade. Under natural conditions, degradation products require at least one year to degrade.
Identification of compostable trays for foods
Experts suggest that several methods such as "observation, smell, and tearing" can be used to identify compostable trays for foods.
Firstly, check whether there is the QS logo and number on the compostable trays for food. Secondly, check whether the surface of the lunch box is smooth and free of impurities or black spots. Generally, transparent plastic lunch boxes are produced using pure polypropylene (PP), which has a higher safety factor. Colorful lunch boxes may use waste plastics, so the darker the color, the less safe it is.
The strength of the compostable trays for food should be tested by touching it. Boxes made from recycled materials or with a large amount of industrial calcium carbonate or talcum powder added to them generally have poor strength and can easily break when lightly torn.
Qualified compostable trays for foods do not have any odor and should be odorless.
The characteristics of "black lunch boxes" can be summarized in a 6-line rhyme: soft and fluffy by hand, easily torn, has a pungent odor when sniffed, is prone to deformation and leakage when heated, leaves wax marks when bent, sinks when shredded into water. Simply remember this and distinguish whether the biodegradable trays for food is qualified.