The inherent properties of polypropylene make a PP woven bag naturally resistant to moisture, which is vital for preserving perishable goods. To enhance this water resistance, manufacturers often apply a thin layer of laminated plastic film to the inner or outer surface of the weave. This lamination process seals the tiny gaps between the woven plastic strips, creating a highly effective barrier against humidity, rain, and damp storage conditions. For absolute moisture protection, a separate loose polyethylene liner can also be inserted inside the packaging.
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