TWIN-SHAFT
DOUBLE PADDLE MIXER
A high-efficiency batch mixer for powders, granules and controlled liquid addition. Two synchronized counter-rotating paddle shafts lifl and project material into a mechanically fluidized zone, creating rapid three-dimensional exchange with low product stress.
HOW THE MIXER WORKS
CHARGE
Load major and minor ingredients through the top inlet.
CLOSE
Close the cover and prove guards and safety interlocks.
MIX
Counter-rotating paddles lift and project the product.
FLUIDIZE
Particles exchange through radial and axial flow paths.
VERIFY
Confirm the validated endpoint by time or sampling.
DISCHARGE
Open the central bottom outlet for rapid emptying.
APPLICATION FIT & PROCESS VALUEx`
RIGHT APPLICATION
Powders and granules
Suitable for free-flowing through moderately cohesive dry formulations and premixes.
Minor ingredient addition
Strong convective exchange supports uniform distribution after suitable dosing or premixing.
Liquid addition
Optional atomizing spray bar distributes limited liquid without creating
local wet spots.
DESIGN VALUE
Mechanically fluidized zone
Opposing paddles reduce the influence of particle size, shape and density during active mixing.
Short cycle potential
Rapid radial, circumferential and axial exchange can reduce blend time after validation.
Low residual design
Close-clearance paddles and a wide flush outlet support efficient discharge and cleanout.
CONSTRUCTION & CONFIGURATION OPTIONS
PRODUCT CONTACТ
SS304 or SS316L with application-specific internal finish and weld treatment
MIXER BODY
Horizontal W-shaped trough with two parallel shafts and adjustable angled paddles
DISCHARGE
Central flush bottom valve selected for flow,
containment and cleanability
DRIVE
Synchronized geared drive with VFD, torque
monitoring and protected transmission
CLEANING
Hinged access cover, removable internals where required, and dry dr or validated wwet cleaning
SAFETY
Interlocked cover, fixed drive guards, zero-speed proofand lockout provisions
MECHANICALLY FLUIDIZED MIXING CONCЕРТ
Two synchronized shafts rotate in opposite directions. Angled paddles lift and project material toward the centre, producing a low-density mechanically fluidized zone while outer return flow and axial transport repeatedly renew particle contact.
CONTROLLED BATCH SEQUENCE
CHARGE
Confirm outlet closed and add ingredients.
CLOSE
Close cover and prove all safety interlocks
MIX
Run both shafts at the validated speed and time.
SPRAY
Sample or confirm the established endpoint.
VERIFY
Release into the destination.
DISCHARGE
Open the central bottom outlet and empty rapidly
CONTROL, SAFETY & MAINTENANCE
Start permissive
Mixer starts only with cover and outlet closed and all guards proven.
Drive protection
Current, torque, speed and bearing monitoring detect abnormal load or obstruction.
Shaft synchronization
Timing gears or a synchronized transmission maintain paddle clearance and direction.
Safe access
Zero-speed proof and electrical isolation are required before opening the mixer.
Recipe control
Speed, blend time, spray sequence and discharge logic are stored by formulation.
Cleaning access
Wide hinged cover, smooth internals and flush outlet support validated cleaning.
STANDARD RANGE & PRELIMINARY SIZING
Screening guide for conventional powder and granular products. Working volume is shown at 60% of gross mixer volume; final fill level, paddle
geometry, shaft speed, torque, power, spray system and discharge must be validated for the actual formulation.
|
MODEL
|
WORKING VOLUME
|
GROSS VESSEL VOLUME
|
BATCH MASS AT 0.5 kg/L
|
INDICATIVE DRIVE RANGE
|
OUTLET CLASS
|
TYPICAL DUTY
|
|---|---|---|---|---|---|---|
|
DPM-100
|
60 L
|
100 L
|
30 kg
|
3-5.5 kW
|
DN150-200
|
Pilot/smallbatch
|
|
DPM-250
|
150 L
|
250 L
|
75 kg
|
5.5-11 kW
|
DN200-250
|
Production
|
|
DPM-500
|
300 L
|
500 L
|
150 kg
|
11-18.5 kW
|
DN250-300
|
Production
|
|
DPM-1000
|
125 mm
|
600 L
|
1,000 L
|
300 kg
|
DN300-400
|
Production
|
|
DPM-2000
|
1,200 L
|
2,000 L
|
600 kg
|
30-45 kW
|
DN400-500
|
Heavy duty
|
|
DPM-5000
|
3,000 L
|
5,000 L
|
1,500 kg
|
55-90 kW
|
DN500-700
|
Heavy duty
|
PRELIMINARY SIZING BASIS
BATCH MASS
Mass = working volume x bulk density
Example: 1,000 L x 0.5 kg/L = 500 kg
Use loose bulk density at charging condition
CYCLE CAPACITY
Batches/h = 60/total cycle minutes
Include charge + blend + verify + discharge
Do not size from mixing time alone
WHAT CONTROLS THE FINAL SELECTION
Bulk behaviour
Density range, flowability, cohesion, angle of
repose and tendency to aerate.
Blend objective
Ingredient ratio, required CV, sampling method
and segregation sensitivity.
Mechanical duty
Gross batch mass, starting torque, shaft
deflection, bearings and transmission load.
Product protection
Fragility, abrasion, temperature sensitivity and
permitted paddle tip speed.
Liquid addition
Dose, viscosity, droplet size, spray location
and allowable wet agglomeration.
Hygienic duty
MOC, surface finish, closures, gaskets,
cleaning method and validation standard.
FINAL ENGINEERING CHECK
Confirm formulation data
Define test and CV target
Complete representative trial
Verify torque and shaft design
Agree FAT acceptance criteria
Need the Right TWIN-SHAFT DOUBLE PADDLE MIXER
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