Valved Kraft Paper Bag

Valved kraft paper bags, also known as multi‑wall block‑bottom valve sacks, are made of 2‑5 plies of 80‑100 g high‑strength extensible kraft paper. Fitted with dedicated corner valve sleeves for automatic valve filling equipment, they realize valve self‑sealing by internal material pressure when powder is filled through the valve opening, requiring no sewing or heat‑sealing procedures. After filling, the bags form neat brick‑shaped profiles for tidy stacking and good anti‑collapse performance, suitable for loading weights of 10‑50 kg. Two bottom options are available: pasted block bottom and stitched bottom. A PE liner can be added for improved moisture resistance. Micro‑perforations on bag bodies enable rapid air venting to reduce the risk of bag bursting during filling. It delivers excellent printing performance and serves as the mainstream heavy‑duty industrial packaging widely applied for dry‑mix mortar, mineral powder, lithium‑ion battery powder, chemical powder and other materials.

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