The choice of a bagging scale feeder is dependent on your product’s flow characteristics.
The types of scale feeders include: gravity, vibratory, belt, auger, impeller, and air packer.
Gravity baggers are available as gross or net weigh baggers and utilize gravity to fill bags with free flowing, high density materials like flakes, granules or pellets where the product easily falls into a bag or hopper. Gravity baggers with mechanical scales require no air or electricity. Applications include corn, grains, fertilizer, refractory materials, plastic pellets, salt, sand, soybean and sugar.
To see examples of gravity feeders click here.
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). A vibratory bagger is designed to fill 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, and gravel.
To see examples of vibratory feeders click here.
Belt fed baggers are available with either as a mechanical or electronic scale and is designed to fill open mouth bags, pails, boxes & containers with non-free flowing powders, granules & flaky materials 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. More accurate weighments can be accomplished with a bulk-dribble two speed feed belt.
To see examples of belt feeders click here.
Auger baggers, sometimes called a screw bagger, use a feed screw to fill valve type & open mouth bags with a minimum of aeration. An optional agitator can be used with poor flowing materials. Auger Baggers are designed for flakes, powders, pellets, granules, and fibrous material that may be heated, ground or crushed. Applications include: abrasives, cellulose, fiber, compost, flour, grain, insulation, limestone, minerals, moss, mulch, pepper, pigment, plastic pellets, resins, rubber, salt, sand, sawdust, soils & sugar.
To see examples of valve type auger feeders click here or open mouth auger feeders click here.
Impeller packers use a spinning impeller to “blow” material into valve type bags. They are ideal for fine, dry, high bulk density (>50#/cu.ft.) powders of less than 200 mesh where crushing or fines are not an issue. Typical applications are fly ash, carbon black, cement, kaolin, clay, graphite, polystyrene, silica, and vermiculite.
To see examples of impeller feeders click here.
Air Packer Feeders:
Air packers, sometimes called forced flow or pneumatic packers, are high speed baggers that blow fluidized material into valve type bags. They are used for free flowing, low humidity, dry flakes, powders & small size granules that cannot be heated, ground or crushed. Applications include: Portland cement, sugar, calcium carbonate and lime.
To see examples of air packer scales click here.
To be sure of the type of bagging feeder required for you application, it is best to submit product samples for testing.
For help in selecting a bagging scale with a specific feeder, contact us.