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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
power(kw)
|
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
power(kw)
|
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
|
Capacity(L/H)
|
Driving power(kw)
|
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
|
Capacity(L/H)
|
Driving power(kw)
|
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
|
Batte is a loss in weight feeder manufacturer, supplying loss in weight feeder, volumetric feeders, and metering feeders.