Characteristics of black wrapping film

Black wrapping film is a new generation of packaging material that is non-toxic, odorless, and cost-effective. After being heated to the glass transition temperature, it can remain stable at room temperature with a maximum thermal shrinkage rate of over 70%. Black wrapping film belongs to the polyester category, environmentally friendly, and easy to recycle and reuse.
It can effectively prevent theft. Black wrapping film has the functions of moisture-proof, dust-proof, anti fixing, and anti loss for the wrapped goods. Black wrapping film is suitable for the outer packaging of valuable items. Widely used for packaging of long building materials, food containers, glass and ceramics, fertilizers and cement, resin raw materials, fabrics, empty cans and solid cans, as well as cardboard pallets. The general specification is 50cm wide, with two series of stretch film for organic and manual use, and a weight of 4KG. Special specifications can be customized.
The production conditions for black wrapping film are very demanding, with a melting point of 178 ℃ and a maximum crystallization temperature of 141 ℃. The stretching process conditions are mainly related to temperature, and in order to produce high-performance and high-quality black wrapping film, strict control of the black wrapping film process conditions is required. It needs to go through four stages: preheating, stretching, heat treatment, and cooling. The preheating temperature should be controlled at 170 ℃, the stretching temperature should be controlled at 150-158 ℃, and the stretching ratio is generally greater than 9. The heat setting temperature should avoid the crystallization temperature of 168 ℃ at the highest crystallization rate as much as possible.