What factors can affect the quality of plastic pp woven bags?

Factors affecting the quality of plastic pp woven bags include many aspects, mainly:

Raw Material Preparation

The quality of raw materials is a critical factor in producing high-quality products. Before production, the granule raw materials need to be thoroughly inspected for appearance, particle size, melt flow index, and moisture content. Some manufacturers also mix new and recycled materials, which helps to reduce costs and protect the environment.

Specifications of Flat Yarn

The width and thickness of the flat yarn directly affect the performance of the pp woven bags. The width of the flat yarn determines the bag’s warp and weft density, while its thickness is related to the bag’s grammage (mass per unit area) and tensile load.

Weaving Density

The warp and weft density is a key indicator of a bag’s load-bearing capacity. Woven bags that require a higher load capacity need a higher density. For example, national standards divide the warp and weft density into different grades, such as 20, 26, 32, 36, 40, and 48 strands per 100mm.

Grammage (Mass per unit area)

The grammage of a woven bag is another important technical indicator, closely related to the warp and weft density and the choice of flat yarn. If the grammage is too low, it will affect the bag’s tensile load and load-bearing capacity. If it is too high, it will increase production costs. Generally, the weft yarn has a greater impact on the grammage, so a stricter selection is required for it.