Disposable lunch boxes are widely used in our lives, and are used in homes, restaurants, and hotels. There are many kinds of disposable lunch boxes, including plastic, cardboard, starch, pulp molding, etc. Let's take a closer look at the characteristics of these disposable lunch boxes.
1. Plastic type
Disposable lunch boxes made of plastic mainly include PP polypropylene and PS polystyrene, both of which are non-toxic, tasteless and odorless. PP is softer. Generally, the use temperature of PP is -6 degrees to +120 degrees, so special It is suitable for holding hot meals and hot dishes. It can be heated in a microwave oven or even steamed in a steam cabinet. The use temperature of modified PP can be controlled from -18 degrees to +110 degrees. The lunch box made of this PP can be heated except for It can be put in the refrigerator and used for refrigerating.
PS is hard and transparent, but it is easy to tear. PS starts to soften when the temperature reaches 75 degrees, so it is not suitable for holding hot rice and dishes, but PS 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 and PS as the lid. The advantage is that the lid is transparent and the PS is harder. It can be made of thinner materials to reduce costs. However, consumers of this design must understand two materials Please remember not to put the whole box of lunch with the lid into the microwave oven for heating.
2. Cardboard type
Cardboard fast food boxes are made of 300-350 grams of bleached sulphate wood pulp paperboard as raw materials, and are made by die-cutting bonding or die-cutting pressing, shaping and other processes through a stamping process similar to sheet processing. In order to prevent oil or water seepage, it is necessary to coat the surface or apply chemical additives. In the process of production and use, it is non-toxic and has no side effects to the human body. However, the quality requirements for cardboard are higher, and the cost is also increased.
3. Starch type
The edible fast food box with starch as the raw material, as the name implies, it is made by mixing and kneading with starchy plants as raw materials, adding dietary fiber and other edible additives. It adopts biological compounding, polysaccharide cross-linking, calcium It is refined by ion chelation and other technologies, and its use temperature is -10 degrees to +120 degrees, so it is especially suitable for holding hot rice and hot dishes. It can be heated in a microwave oven or put in a refrigerator for use.
4. Plant fiber type
In terms of environmental protection advantages, the plant fiber lunch box has obvious advantages. It uses plant fibers extracted from rice straw, rice hulls, bagasse, etc., as raw materials, and adds forming agents, binders, water-resistant agents and other auxiliaries to stir through the molding machine. It is processed by drying, shaping and disinfecting. These agricultural leftovers can become industrial raw materials and contribute to the comprehensive utilization of agricultural resources.
5. Biodegradable plastic lunch box
The raw materials for this type of lunch box are degradable plastics. The so-called degradable plastics are the addition of a certain amount of additives, such as photosensitizers, starch and other raw materials during the production process of plastics. In this way, the degradable plastic products are used up and discarded. After being exposed to nature for three months, it can be broken down into fragments by the complete shape, thus improving the environment.
6. Biodegradable lunch box
Biodegradable lunch box is a relatively advanced environmentally friendly product. It uses starch as the main raw material, adds annual plant fiber powder and special additives, and undergoes chemical and physical treatment to make a biodegradable snack box. Since 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 material blended with it is also a fully degradable material, so it can be said that it has no impact on the environment. The main source of raw material starch can be corn, potatoes, sweet potatoes, cassava and other annual plants. Naturally, most of the biodegradable production materials are food crops, which can completely replace foam lunch boxes without any pollution to the environment.