M A G U I R E P R O D U C T S , I N C .
24
S e r i e s M P A
THREE AND SIX ROLLER PUMP - MAXIMUM OUTPUT SPECIFICATIONS
Model
Tubing
Max RPMs
Flow/hour @ 10#/gal
Min Dispense
MPA-
I.D.
Motor Shaft
Min.(grams)
Max.(lbs)
(one cycle)
18-G
1/8" (green)
30
36
2.9
.006 grams
34-G
1/8" (green)
56
36
5.4
.006 grams
34-R
3/16" (red)
56
81
11.6
.013 grams
51-G
1/8" (green)
90
36
8.6
.006 grams
51-R
3/16" (red)
90
81
18.0
.013 grams
51-C
1/4" (clear)
90
138
30.0
.022 grams
(Model 34-G is supplied unless otherwise specified)
To select proper pump size:
1. Determine maximum extrusion rate in pounds per hour. For injection molding, extrusion
rate is approximately equal to tons of clamping pressure; i.e., a 500-ton press extrudes
material at about 500 lbs/hour. A more accurate estimate may be made using shot weight
and screw return time for any molded part:
(Shot wt in grams) / (Screw return time in seconds) x 8 = (lbs/hr)
2. Determine maximum expected letdown ratio and multiply this times extrusion rate for
maximum expected lbs/hour of color required.
3. From the above chart, select the pump with the lowest pumping rate that meets these
maximum requirements.
Examples:
250 lbs/hr x .2% = .5 lbs/hr max. color -- Select Model 18-G
320 lbs/hr x 1.2% = 3.8 lbs/hr max. color -- Select Model 34-G
700 lbs/hr x 2% = 14 lbs/hr max. color -- Select Model 51-R
