Powder Filling Machines
Powder filling machines are based on measuring the volume, weight or level of powder required in each container. View PPMA’s extensive list of members providing Powder Filling Machines.
How do Powder Filling Machines work?
The majority of powder filling machines work on a volumetric basis, feeding a set amount of powder into a container. The feed may be by gravity, vacuum or auger mechanism, with the measurement of the powder by a predetermined level, or via a timed flow. Machines that measure powder by weight are also used.
A level filling mechanism used to fill a powder to a predetermined level in a container with the product flowing from a hopper or other feeder under gravity. Fillers of this type are suitable for accurate filling of products at low, medium and high speeds.
Timed Flow Filling Machines
Timed flow filling mechanisms measure amounts of powder by controlling the product flow duration to a predetermined value. This indirect method of achieving a volumetric fill has the benefit of being relatively low cost and easy to clean. Fillers of this type are used in situations where a single machine is required to fill a wide range of product volumes. Timed flow fillers are generally used for low speeds.
Vacuum Filling Machines
Level filling mechanisms fill a powder to a predetermined level in a rigid container. The flow is initiated by applying a vacuum to the container. This technique is used for filling free-flowing powders like milk powder. Vacuum fillers are suitable for accurate filling of products at both low and medium speeds.
Auger Filling Machines
Auger Filling Machines are volumetric mechanisms which measure a powder or free-flowing solids using an auger (a screw conveyor). The auger is rotated for a predetermined number of revolutions in a conical hopper to discharge the required volume of product. To compensate for changes in the bulk density of the product, auger fillers are frequently used in conjunction with a weighing instrument like a checkweigher. Fillers of this type are suitable for filling products at both low and medium speeds.
Volumetric Cup Filling Machine
A filling machine which measures out a product, usually free-flowing solids or powder, in a cup of predetermined volume. These machines are typically used for products like rice or frozen peas which do not generate dust. Fillers of this type are suitable for accurate filling of products at both low and medium speeds.
Filling Machines for Dusty Powders
The filling of powders and free flowing solids poses particular problems because of the generation of dust and variations in bulk density. Very dusty products are typically filled using auger fillers or vacuum fillers. However, where the bulk density of product varies significantly, it will usually be necessary to combine this with a weight correction mechanism like a checkweigher because typically these products are sold by weight.
Weight Filling Machines
A gross weight filling machine, sometimes known as a weigh filler, measures a predetermined mass of powder directly into a package resting on a weighing instrument which controls the filling operation. This method of weighing is used for products as diverse as jars of instant coffee and 200 litre drums of chemicals. Gross weighing machines are suitable for accurate filling of products at both low and medium speeds.
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