INPAK SYSTEMS offers a wide variety of scales that weigh and fill paper or plastic open mouth bags, boxes, drums and totes. Open mouth bagging machines can handle 5-120 lbs. bags at speeds up to 14 bags/minute.
Gross Weigh vs. Net Weigh
Open Mouth Baggers can be divided into two types: gross weigh baggers and net weigh baggers. Gross weigh scales weigh the material in the bag as it is being filled. Net weigh scales pre-weigh the material in a hopper and then dump it into a bag. Typically, a net weigh scale is about 2x faster as a comparable gross weigh scale because, as the hopper of a net weigh scale is being filled, the bag can be positioned. If you have more questions about gross weigh versus net weigh, contact us to determine the best open mouth bagger for your needs
Mechanical vs. Electrical Scale
Open Mouth Baggers have either a mechanical or electronic scale. Mechanical scales, sometimes called beam scales, have weights that are added &/or moved to set the desired weight. Mechanical scales are less expensive and some do not require electricity or compressed air. Electronic scales have one or more load cells that measure the weight and are more accurate. Some electrical sales can output their measurements to a printer or computer.
Open mouth baggers are designed with different feeders: gravity, auger, belt and vibratory. The characteristics of the material (particle size, fragility, dryness, free-flowing, stickiness, floodable, etc.) determine the best type of feeder. Material characteristics list. If you have more questions, contact us to determine the best type of open mouth bagger for you.
Contact Us to receive more information about our product lines. Our packaging systems experts will then find the right solution for you.
Open Mouth Auger Baggers
Auger baggers are designed to fill 20-110 lbs. open mouth bags, pails, boxes and containers with dry, free-flowing materials like: flour, cake mix, chemical powders, starches, cement grouts, livestock supplements and similar materials. Product flows by gravity from a fill hopper into a single or dual auger feeder where it is delivered to a gross weigh or net weigh scale. With a dual auger system, dual augers deliver most of the material and then a single, sometimes smaller, auger will “dribble” in the balance of the material. When the desired weight is achieved the augers stop and a cutoff gate closes. Auger baggers can fill 1-10 bags/minute with an accuracy of +/-0.25%.Open Mouth Belt Baggers
A belt bagger is designed to fill 20-110 lb. open mouth bags, pails, boxes & containers with non-free products such as: vegetables, cake mix, mulch, wood chips, molasses based animal feeds, soils, damp sand & gravel and similar materials that do not gravity feed well. Gross weigh & net weigh open mouth belt baggers are available with either a mechanical or electronic scale. From a fill hopper, material is deposited on a belt where it is dumped directly in to a bag (gross weigh) or a weigh hopper (net weigh). When the target weight is reached the belt stops. More accurate weighments can be accomplished with a bulk-dribble two speed feed belt. Belt baggers can fill 1-9 bags/minute with an accuracy of +/-0.25%.Open Mouth Gross Weigh Gravity Baggers
Gross weigh gravity baggers are designed to fill 20-110 lbs. open mouth bags with free-flowing, granular materials and pellets like seeds, grains, sand, rock salt, plastic pellets fertilizer, corn, soybeans, salt, sugar, sand, limestone, refractory materials and plastic pellets. Gross weigh gravity baggers are available with a mechanical or electronic scale. Material flows by gravity from the fill hopper through a gate and into a funnel spout, filling the bag. The gate opening is adjusted to determine the flow rate. When the desired weight is obtained, the gate closes. Gross weigh gravity baggers can fill 1-14 bags/minute with accuracy up to +/- 2 oz.Open Mouth Net Weigh Gravity Baggers
Net weigh gravity baggers are designed to fill 20-110 lbs. open mouth bags with free-flowing, granular and pelleted materials such as seed, grain, fertilizer, minerals, crystalline materials, fertilizer, corn, soybeans, salt, sugar, sand, limestone, refractory materials and plastic pellets. Net weigh gravity baggers are available with an electronic scale. The material is loaded into a fill hopper. A flow gate is adjusted to determine the flow rate into the weigh hopper. When the desired weight is obtained, the fill gate closes. Then a 2nd gate at the bottom of the weigh hopper opens and the material drops through a funnel spout into a bag. Net weigh gravity baggers can fill 1-15 bags/minute with accuracy up to +/- 2 oz.Open Mouth Vibratory Baggers
Vibratory baggers are designed to fill 5-110 lb. open mouth bags, pails, boxes, and containers with wet or dry powdered, pelleted, granular or odd shaped materials of varying densities such as rice, nuts, candies, plastic pieces, dry foods, seeds, feed pellets, gravels, and similar materials. Gross weigh and net weigh open mouth vibratory baggers are available with a single speed vibratory pan (usually with a mechanical scale) or a more accurate, two speed vibratory pan (usually with an electronic scale). With the two speed vibrator, 95% of the material is added at a high rate (bulk fill) and then the balance is added at a slow rate (dribble fill). Vibratory baggers can fill 1-6 bags/minute with accuracy up to +/- 0.25%.Open Mouth Bag Fillers FAQs
Open-mouth baggers are optimized for large pellets, textured agricultural feeds, grains, pet food kibble, wood pellets, flakes, and coarse aggregates.
The choice depends on your required throughput speed, capital budget, and accuracy. Gross weigh systems weigh the material directly in to the bag. They have a lower initial investment, smaller footprint, and average speeds of 4 to 8 BPM.
Net weigh systems pre-weigh the material into a bucket before being dropped into the bag. They achieve higher accuracy and speeds of 12 to 24+ BPM.
Mechanical scales, sometimes called beam scales, have weights that are added &/or moved to set the desired weight. Mechanical scales are less expensive, and some do not require electricity or compressed air. Digital scales have load cells that measure the weight and are more accurate. Some electrical sales can output their measurements to a printer or computer.
Open-mouth baggers can accommodate virtually all standard bag types. This includes multi-wall paper, woven polypropylene (PP), laminated poly-woven, polyethylene (PE) plastic film, and burlap/jute bags. The system can handle pillow-style bags, side-gusseted bags, and bags utilizing handles or easy-open pull-tabs.
Standard open-mouth systems can fill 1 oz. to 110 lbs. bags.
Manual baggers can fill 5 to 10 BPM. An automated system can fill 15 to 30+ BPM. Contact our technical engineers with your bagging requirements and they can recommend a model that meets your needs.
It depends on your bag material and industry compliance. Sewing/stitching is the standard closure for woven polypropylene and plain multi-wall paper bags, often paired with crepe tape for a tighter sea. Heat sealing is required for polyethylene (PE) plastic bags to create a completely liquid-tight, moisture-proof barrier.
Gravity feeders are best for free-flowing, granular products like corn, wheat, sand, and plastic pellets. Vibratory feeders are Ideal for non-free-flowing materials, irregular flakes, or fragile products like cereal, charcoal, and fertilizers. Belt feeders are used for sticky, moist, or cohesive materials like topsoil, mulch, compost, and sticky cattle feed blocks. Contact our technical engineers with your bagging requirements and they can recommend a model that meets your needs.
Yes, upgrades are available. Contact our technical engineers with your requirements and they can recommend a model that meets your needs.
Yes, installation, training, and/or service contracts are available.
The warranty period is established by the manufacturer and is typically 12 mos.