There are mainly two kinds of disposable lunch boxes, plastic, PP, PP, PS polystyrene, non-toxic, tasteless and odorless. PP is soft. Generally, the use temperature of PP is -6 degrees to+120 degrees, so it is especially suitable for holding hot rice and vegetables. It can be heated in a microwave oven or even cooked in a steam cabinet. The use temperature of modified PP can be controlled from-18 to+.
Hard and transparent, but easy to tear, it begins to soften when the temperature reaches 75 degrees. It is not suitable for holding hot rice and hot dishes, but it has good low-temperature performance and is the best packaging material for ice cream.
In order to reduce the cost, some lunch box factories use PP as the box body and PS as the box cover. Advantages are that the cover is transparent, PS is hard, and thinner materials can be used to reduce costs. But consumers must understand the difference between the two materials in this design, and remember not to heat the whole lunch box and lid in the microwave oven.
Cardboard type
The cardboard snack box is made of 300-350g bleached kraft pulp cardboard through stamping process similar to sheet metal processing, die-cutting bonding or die-cutting pressing, molding and other processes. In order to prevent oil leakage or water seepage, it is necessary to coat the surface with a film or chemical additives. It is non-toxic and has no side effects on human body during production and use. However, the quality of cardboard is higher and the cost is increased.
Starch type
As the name implies, an edible snack box made of starch is made of starch plants, dietary fiber and other edible additives through stirring and kneading. It is refined by bio-compounding, polysaccharide crosslinking, calcium ion chelation and other technologies. The temperature is-10℃ to+120℃, which is especially suitable for holding hot rice and hot dishes and can be heated in microwave oven.
Pulp molding
Pulping and purifying wood pulp or millet fiber pulp such as reed, bagasse, wheat straw and rice straw, adding appropriate amount of nontoxic chemical additives, shaping, drying, shaping, trimming and sterilizing. The aesthetics of the product is not high, and it will also increase the pollution of wastewater.
Plant fiber type
In terms of environmental advantages, plant fiber lunch boxes have obvious advantages. It is made of plant fiber extracted from rice straw, rice husk and bagasse, and added with additives such as molding agent, adhesive and water repellent, and then stirred, dried, shaped and disinfected by a molding machine. These agricultural leftovers can become industrial raw materials, which is beneficial to the comprehensive utilization of agricultural resources.
Degradable plastic lunch box
The raw material of this lunch box is degradable plastic. The so-called degradable plastic means adding a certain amount of additives, such as photosensitizer, starch and other raw materials, in the plastic production process. In this way, after being used up and exposed to nature for three months, degradable plastic products can be decomposed into pieces from a complete shape, thus improving the environment.
Biodegradable lunch box
Biodegradable lunch box is an advanced environmental protection product.
It uses starch as the main raw material, adds annual plant fiber powder and special additives, and makes biodegradable fast food boxes by chemical and physical methods. Because starch is a biodegradable natural polymer, it is decomposed into glucose under the action of microorganisms, and finally into water and carbon dioxide. In addition, the materials mixed with it are also fully degradable materials, which can be said to have no impact on the environment. The main sources of raw starch can be annual plants, such as corn, potato, sweet potato and cassava. Naturally, most of the raw materials produced by biodegradation are food crops, which have no pollution to the environment and can completely replace foam lunch boxes.