Block bottom valve bag is a new-type of packaging bag, widely used in packaging cement, flour, fertilizer, building materials , etc . Compared with the traditional cement bag and kraft paper cement bag, it is very economical and convenient, as well as big production capacity .
PP valve woven bags are designed for quick de-aeration and high filling speed.The valve can either be self-closing by the pressure of the product, It is more advanced than tubular bags
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