What are the types of disposable insulated lunch boxes? How to tell if the quality of the takeaway insulated lunch box is good or bad

What are the types of disposable thermal lunch boxes

1.Plastic type

Disposable lunch boxes made of plastic are mainly PP polypropylene and PS polystyrene, both of which are non-toxic, tasteless and odorless, and PP is soft. Generally, the temperature of PP is -6 degrees to +120 degrees, so special Suitable for hot dishes 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 in addition to It can be stored in the refrigerator for use outside 100 degrees.

PS is hard and transparent, but it is easy to tear. PS starts to soften when it is used at a temperature of 75 degrees, so it is not suitable for hot dishes and hot dishes. However, PS has low temperature performance and is the best packaging material for ice cream.

In order to reduce costs, 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 hard. It can be made of thinner sheets to reduce costs. However, consumers of this design must understand two materials. Make sure that you do not put the whole box of rice in a microwave oven with the lid on.

2.Cardboard type

The cardboard snack box is made of 300-350 grams of bleached sulfate wood pulp cardboard as a raw material, and is subjected to die-cutting bonding, die-cutting pressing, and shaping through a stamping process similar to sheet metal processing. In order to prevent it from seeping oil or water, it is necessary to coat the surface or apply chemical additives. It is non-toxic and has no side effects on the human body during production and use. However, the requirements for the quality of cardboard are higher, and the cost has increased.

3. Starch type

Starch-based edible snack box, as the name suggests, is based on starch plants, added dietary fiber and other edible additives and kneaded. It uses biological compounding, glycan cross-linking, calcium Refined by ion chelation and other technologies, the use temperature is -10 degrees to +120 degrees, so it is especially suitable for hot dishes and hot dishes. It can be heated in a microwave oven and can be put in the refrigerator for refrigeration.

4, pulp molding

Wood pulp or reed, bagasse, wheat straw, straw and other annual herbaceous plant fiber pulp are pulped and purified, and an appropriate amount of non-toxic chemical additives are added to form, dry, shape, shape, trim, and disinfect. The aesthetics of the product is not high, and it will also increase the pollution of wastewater.

5, plant fiber type

In terms of environmental protection advantages, plant fiber lunch boxes have obvious advantages. It uses plant fibers extracted from straw, rice husks, bagasse, etc. as raw materials, and adds additives such as molding agents, binders, and water-resistant agents to the molding machine. After drying, shaping, disinfection and other post-processing. These agricultural wastes can become industrial raw materials, which is helpful to the comprehensive utilization of agricultural resources.

6.Degradable plastic lunch box

The raw material for the manufacture of this kind of lunch box is degradable plastic. The so-called degradable plastic is to add a certain amount of additives such as photosensitizer, starch and other raw materials in the production process of plastic. In this way, the degradable plastic products are used up and discarded. After being exposed to nature for three months, it can be broken into fragments from complete shapes, thus improving the environment.

7.Biodegradable lunch box

The biodegradable lunch box is a relatively advanced environmentally friendly product. It uses starch as the main raw material, and adds annual plant fiber powder and special additives, which are processed by chemical and physical methods to make a bio-degradable snack box. Because starch is a biodegradable natural polymer, it is broken down into glucose by 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 annual plants such as corn, potatoes, sweet potatoes, and cassava. Naturally, most of the raw materials for biodegradable production are food crops, which can completely replace foam lunch boxes without any pollution to the environment.

How to tell if a takeaway insulated lunch box is good or bad

1. Shen: Take a glass and fill it with water, tear off a small piece from the pure polypropylene (PP) plastic lunch box, and put it all into the glass. Soak it completely in the water to see if the plastic sheet will surface. When experimenting at home, instead of tearing the plastic lunch box, you can put the complete lunch box in a water-filled laundry tub. Remember to immerse the lunch box completely in water.

2. Touch: The inner wall of the box is rough and feels astringent, which indicates that there are solid residues on the inner wall; when exposed to light, there are obvious small irregular black spots in the surface of the box; if it is, it is a poor quality product.

3. Tear: Because high-quality lunch boxes are made of new PP plastic, they have good toughness and high hardness, and cannot be torn by hand; poor-quality lunch boxes are soft to the touch, and they will break if you tear it lightly.

4. Appearance: It can be identified by looking at the QS logo and number on the lunch box.