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Continuous gravimetric feeder processing
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Continuous gravimetric feeder processing is a manufacturing practice that has been used in the plastics, chemical and food industries for decades. Although primarily used for liquid processing, the innovations made in dry powder feeder technologies have enabled the use of continuous dry ingredient feeding for a variety of applications.

Even advances in the traditional batch pharmaceutical industry have paved the way forward for implementation of continuous processing for tableting. The recent U.S. Food and Drug Administration approvals of drug formulations made by continuous processes for Vertex and Janssen Pharmaceuticals, both using continuous loss-in-weight (LIW) feeder technologies, have indicated an ongoing paradigm shift in this industry.

Processes such as continuous blending/mixing, continuous milling/micronization, continuous hot melt extrusion, continuous wet extrusion or granulation, and continuous coating are just a few examples of the processes used by many industries. At the heart of each of these continuous processes is the LIW feeder. This article defines the items necessary for accurate feeding and outlines the important role that accuracy can play in the end product and process quality of any continuous operation.

Single screw gravimetric screw feeder types and specifications:

Type
Screw
specification
Capacity
L/H
Driving
powerkw
Hopper
(optional)
Feeding
accuracy
BAT-LF-SS10
10
3-30
0.1
10L
±1%
BAT-LF-SS18
18
6-60
0.4
20L
±0.5%
BAT-LF-SS28
28
10-100
0.55
60L
±0.5%
BAT-LF-SS38
38
30-300
1.1
80L
±0.5%
BAT-LF-SS46
46
40-400
1.5
120L
±0.5%
BAT-LF-SS64
64
50-500
1.5
160L
±0.5%
Type
Screw
specification
Capacity
L/H
Driving
powerkw
BAT-LF-SS10
10
3-30
0.1
BAT-LF-SS18
18
6-60
0.4
BAT-LF-SS28
28
10-100
0.55
BAT-LF-SS38
38
30-300
1.1
BAT-LF-SS46
46
40-400
1.5
BAT-LF-SS64
64
50-500
1.5


Twin screw gravimetric screw feeder types and specifications:

Type
Screw specification
CapacityL/H
Driving powerkw
Hopper (optional)
Feeding accuracy
BAT-LF-TS10
10
5-50
0.4
10L
±1%
BAT-LF-TS18
18
10-100
0.55
20L
±0.5%
BAT-LF-TS28
28
30-300
0.75
80L
±0.5%
BAT-LF-TS38
38
70-700
1.1
100L
±0.5%
BAT-LF-TS46
46
90-900
1.5
160L
±0.5%
BAT-LF-TS64
64
150-1500
2.2
200L
±0.5%
BAT-LF-TS78
78
300-3000
2.2
200L
±0.5%
 

Type
Screw specification
CapacityL/H
Driving powerkw
BAT-LF-TS10
10
5-50
0.4
BAT-LF-TS18
18
10-100
0.55
BAT-LF-TS28
28
30-300
0.75
BAT-LF-TS38
38
70-700
1.1
BAT-LF-TS46
46
90-900
1.5
BAT-LF-TS64
64
150-1500
2.2
BAT-LF-TS78
78
300-3000
2.2

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