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Double Ribbom Screw Mixer with full width discharge bottom provide very fast discharge of mixer and are suitable for plants having mixer fitted at some height (i.e., on struchure)
and have surge bin below it. Due to fast discharging, segregation at discharge is greatly avoided.

These mixers consists of U-shaped horizontal trough in which a heavy duty shaft with two ribbons in helix shape at different pitch circle diameter are mounted with the help of arms.
The ribbon helix is so shaped that when inside mixing shaft rotates, one ribbon pushes the material in one side while at same time other ribbon pushes the material opposite side.
So, particles inside the mixer are given very fast movement and homogenous mix is achieved.

Lark Engineering introduces smart double ribbon screw mixers with its patented ( Pending ) world advanced ribbon design which can perform mixing at much faster rate using minimum of power.
Our Patented Design

Double ribbon screw mixer is being manufactured in this world from the last many decades with common design features of inner and outer blades. One or more of following problems are generally faced in these designs:

  1. Bending of ribbon and arms particularly near to side walls.
  2. Excessive product heating.
  3. Longer mixing time.
  4. More power per ton of mixing.
  5. Mixing not up to the mark.

In our patented design, both outer and inner ribbons are having variable cross-section area i.e., wider at the start of the ribbon and narrower at the end, both ribbons are having end relief.
With these modifications, we have achieved following results:-

  1. Breakage and bending of ribbons completely eliminated.
  2. Very less heat is generated.
  3. Mixing Efficiency: Due to the usage of much wider blades, more pitch of blades, higher rpm, and the mixing efficiency of these mixers is the highest in its class world over.

For achieving same mixing result on any other mixer in its class it will at least save 25-35% of time, similarly at least 25-35% power is saved.

Salient features
Pneumatically operated full width drop bottom Bombay discharge gate which is self locking type to ensure no leakage during operations and complete clean out.
Big access doors provided for easy access to inside of mixer for easy maintenance and cleaning.
air-exchange pipe
Fitted with air-exchange pipe for smooth filling and discharge of mixer.
Assessing doors interlocked with main motor, when opened will not let the mixer to start.
Drive System
Suitable combination Inline helical gear box, shaft mounted gear box with V-Belts , or chain sprocket as per suitability to system requirement is used to ensure that it is highly reliable with good factor safety, energy efficient and maintenance free.
Line Diagram
Technical Specifications & Dimensions
Drum Volume
Working Volume
in H.P
Capacity for feed
in kgs with
All Over Dimensions Approx. Weight
in kgs.
( without Motor)
Volume seaworthy
packing Cu.m.
Cu.ft Ltr Cu.ft Ltr A B C
500 2150 880 1200 800 4.4
1000 2380 1145 1550 1400 7
2000 3030 1480 1730 2685 12
3000 3700 1550 1955 3900 16.7
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