Why does the plastic box become brittle when used?

- Apr 25, 2019-

Many product packagings now use plastic boxes and transparent folding boxes. These products are highly transparent and packaged, but after they have been placed for a while, they will become brittle. What is the cause? 

The plastic box is made of PVC/PET/PP/PS, such as transparent folding box, hand bag, elevator hanging piece and other related plastic products, which can be printed by UV offset printing, silk screen printing, bronzing/silver, sanding, etc. The effect has the characteristics of increasing user experience, durable and durable packaging, moisture proof, waterproof, high toughness and improved product grade.

The boxed packaging container made of plastic has many characteristics such as low density, light weight, easy processing, and the like, and the appearance can be transparent or opaque. It is widely used in the food packaging industry. The advantages of plastic packaging box are as follows:

1, easy to shape, as long as the mold is replaced, you can get different types of containers, and easy to form large-scale production.

2, the packaging effect is good, the variety of plastics is easy to color, the color is bright, and various kinds of packaging containers can be made according to the needs to obtain the best packaging effect.

3, has good corrosion resistance, acid and alkali resistance, impact resistance; and has good mechanical strength

Generally, at low temperatures, the plastic box will become brittle. The plastic boxes are all polymer materials, which are hard and tough at normal temperature, and show toughness and elasticity even at relatively high temperatures, once the temperature is lowered to its vitrification. When the temperature is below the brittle point, it will show brittleness. The usual example is that the plastic box barrel is very soft in summer, and it will be damaged if it falls, but it is very hard in winter. If you drop it, it may be broken. Another situation is that plastic box products will become brittle due to the loss of plasticizer during use. Because the plastic box itself is hard and brittle, it is processed into plastic. When the box product is added, a plasticizer is added to show the toughness and elasticity.

The material of the plastic box is plastic. The plastic material is special, the structure is very stable but it is easy to be affected by the temperature. Therefore, when storing and using, the heat source should be avoided as much as possible and stored in a dry place.