There are three kinds of conventional raw materials for plastic baskets/crate on the market: HDPE, PP and Modified Plastics.
1.HDPE
High density polyethylene (HDPE) is a white powder or granular product. Non toxic and tasteless; The hardness, tensile strength and creep are superior to each other; Good wear resistance, electrical insulation, toughness and cold resistance; Good chemical stability, insoluble in any organic solvent at room temperature, and resistant to acid, alkali and various salts; The aging resistance is poor, and the environmental stress cracking resistance is not as good as that of low-density polyethylene.
At present, it is the raw material used more in the production of crates.
Advantage
Higher strength and good impact resistance. The bearing capacity, compression resistance, hygiene, functionality and other aspects of the performance are very good.
Disadvantage
It is easy to deform, age, embrittlement, stress cracking, low surface hardness and scratch.
2.PP
Polypropylene is called PP for short. It is white waxy material with transparent and light appearance. It has chemical resistance, heat resistance, electrical insulation, high strength mechanical properties and good high wear resistance.
Advantage
It is sanitary and can be quickly cleaned and disinfected. PP new material has good compression resistance and resistance to external forces. This material is also resistant to acid and alkali corrosion and moisture, and can be used well even in low temperature environment.
Disadvantage
With low scale accuracy, insufficient rigidity and poor weather resistance, it has post shrinkage, and is easy to age, become brittle and deform after film removal.
3.Modified Plastics
Because pp material has good toughness but poor strength, it will be considered to increase the strength of raw materials in the production and development of modified materials. PP material also has better temperature resistance and aging resistance. While ensuring the toughness of pp material, the strength of pp plastic basket is improved.
Advantage
There are also factories that directly add caco3-calcium carbonate to improve the strength of the frame. So as to improve the stability and rigidity of the crate/basket. In the production process of the shell of many small household appliances, this operation is also common. While improving the strength of the product, it also saves the cost of raw materials.
4.Other
Because of different use scenarios and service life of plastic crates/baskets, the selected raw materials can be divided into new materials and recycled materials.
The service life of new material products is twice that of products with recycled materials.
Now many disposable boxes will use recycled materials,because the cost is cheaper. It is also common to mix different kinds of materials together.
When using such raw materials to produce crates, pay attention to the replacement of bimetal screws on the injection molding machine. Because of the poor quality of the mixture, it often happens. There is soil and iron filings. It will reduce the service life of injection molding machine screw for sure.But still have lots factory choose to use this material,to reduce the cost.
It is also a good choice if it is only used on disposable boxes. That is to reuse waste for many times and protect the environment. It also reduces the use cost of customers. What do you think?
