Ensacadora de pó

A powder bagging machine automatically fills and closes open-mouth bags with powder, granule or pellet products. Unlike valve bag machines (which fill through a valve in the bag itself), open-mouth bag fillers fill through the open top of the bag. The machine holds the bag open under a fill spout, doses in the product to target weight (net-weight via load cells, or gross-weight via platform scale), vibrates the bag to settle the product, then closes the bag top by sewing, heat sealing or folding. Commonly used for 10–50kg bags of flour, cement, fertilizer, chemical powder and animal feed.

Net-weight filling: the bag is suspended on the machine and product is dosed into the empty bag; load cells weigh the bag contents directly, ignoring bag weight variation. Achieves ±0.1–0.2% accuracy. Slower (200–400 bags/hr typical). Preferred for food, pharmaceutical and regulated products. Gross-weight filling: the bag sits on a platform scale; total weight (bag + product) is monitored. Faster (400–800 bags/hr) but less accurate (±0.3–0.5%) due to bag weight variation. Preferred for cement, fertilizer, chemical and construction materials where speed is more important than fine accuracy.

Open-mouth bag closing options: Sewing — automatic industrial sewing machine sews the bag top closed; standard for woven PP and paper bags in flour, fertilizer and feed industries. Heat sealing — inline heat sealer seals PE bag tops; clean finish, no threads; standard for food-grade PE bags. Ultrasonic sealing — ultrasonic welding for non-woven and laminated bags; strong seal without adhesive. Fold and staple — simple mechanical closure for some industrial applications. Some machines combine sewing and tape over-closing for added sealing security.

Yes. Free-flowing powders (sand, pellets, sugar, salt, feed): a simple gravity-feed fill spout with butterfly valve dosing is sufficient. Cohesive or hygroscopic powders (flour, cement, fine chemical powder): a pneumatically-assisted impeller fill spout, vibration table, and anti-bridging agitator in the hopper are required. Fine or dusty powders (cement, fly ash, talc): a sealed fill spout with dust extraction collar prevents powder escape during filling. Contact us with your specific powder type for the appropriate machine configuration.

Throughput depends on fill weight and powder flow rate. Typical speeds: 25kg bags of free-flowing granules: 400–600 bags/hr. 25kg bags of flour or fine powder: 200–400 bags/hr. 50kg bags of cement or fertilizer: 150–300 bags/hr. Fully automatic systems with bag magazine, automatic bag hanging, fill, settle, close and convey achieve the upper speed range. Semi-automatic systems where operators manually hang bags achieve 200–350 bags/hr.

A semi-automatic open-mouth bag filler with manual bag hanging (25–50kg bags): from $15,000–$35,000 USD. Fully automatic with conveyor and sewing closer: $40,000–$90,000 USD. Complete turnkey bagging line with palletiser: $100,000–$250,000 USD. Prices vary based on bag size range, closing method, automation level and dustcontrol requirements. Contact us for a free quotation tailored to your application.