Polypropylene (PP plastic) is another excellent resin variety developed after nylon. It is a linear polymer with high density, no side chains, and high crystallinity. It has excellent comprehensive properties. It is white, translucent and waxy when uncolored; lighter than polyethylene. Transparency is also better than polyethylene and stiffer than polyethylene.
Usually we say that PP new materials can also be said to be PP raw materials for woven bags. What is the difference between pp new material and pp recycled material?
The performance difference is as follows:
1. The quality of recycled materials is unstable, with many impurities, and contains other raw materials.
2. The quality of recycled materials is poor, and the tensile strength and toughness are average.
3. The color of recycled materials is generally not very bright white, and the chroma is generally dark. Like the recycled material bags with some new materials added, the color will be slightly brighter. The quality, color, and price are also between pure new materials and Between recycled materials.
The specific points are:
1. Unstable, sometimes this batch of color, performance is similar to the model, the next batch may be more or less a problem, that is, each batch of materials cannot be guaranteed the same. Therefore, there are so-called subtle deviations in normal colors, arts and sciences, and tensile forces in the industry that cannot be avoided.
2. The mechanical properties of materials in the physical properties of recycled materials are worse than new materials. Generally, they can o原来用于需求或较低的场合mixed with new materials to reduce costs.
3. The color of the new material is generally brighter, brighter, and the gloss is better, while the surface gloss of the old material is relatively poor.