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The efficient turntable automatic dispensers

An ideal family of turntable dispensers built with a simple yet effective design for handling the evolving nature of the colorants.

  • FLEX 500
Base Dispenser Features
Dispensing technologyPiston pump
Dispensing flowSequential
Canister configurationsUp to 24
Canister sizes [l] (q-G)2,5 (2.64 q) / 5 (1.32 G)
Canister materialPolymeric
Circuit flow rate [l/min]*0,3 - 0,6 (according to colorant viscosity)
Minimum dispensed quantity [fl.oz.] (cc)*1/576 (0,051)
Valve typeCeramic valve
Nozzle closure systemSingle / Rotating brush
Pump typePiston - Pump size [cc] (fl.oz.): 59,15 (2)
Electronic generation/type-
Colorant base compatibilityDecorative and Industrial: Water, Universal and Solvent
Shelf typeManual
Can Handling Features **
Minimum can height [mm] (in)50 (2)
Maximum can height [mm] (in)430 (16.9)
Minimum can diameter [mm] (in)70 (2.6)
Maximum can diameter [mm] (in)230 (9.1) [w/ hole in center]
Minimum hole diameter [mm] (in)25 (0.8)
Power Supply / Machine Environment
Power supply [V] -- Frequency [Hz]Single phase 100 - 240 ±10% -- 50/60
Maximum power absorption [W]50 [w/ Manual shelf] - 100 [w/ Semi-aut. Shelf]
Dispenser Dimensions
Length [mm] (in)790 (31.1)
Depth [mm] (in)1050 (41.3)
Height [mm] (in)1530 (60.2)
Footprint [m2] (ft2)0,83 (8.9)
Machine Weight [kg] (lb)140 (309)

* Values highly affected by nature of the colorants and their rheological properties.

** IMPORTANT: most machine and paint can dimensions refer to the basic machine model. Options and alternative devices can change these values.
Please check with your local sales representative or contact one of COROB’s offices.

Data refers to base configuration machine, figures may vary according to different specifications.

FLEX 500 Brochure
FLEX 500 Data sheet


The dual direction turntable is optimized for use in smaller areas with a silent DC motor and techno-polymer gear train. This setup both provides a faster dispensing reaction time and makes the unit suitable for all the working environments.

The high compatibility techno-polymer brush allows the unit to work with water and organic solvent based colorants. The brush rotates with a 90° axis compared to the dual directional turntable’s plane surface. This guarantees a complete cleaning cycle in both directions, greatly improving cleaning time.

A stainless steel pump, POM valve housing and the everlasting three-way, two-position ceramic valve work in synergy to ensure efficient and precise colorant dispensing.

The valve manages the operations during the suction, re-circulation and dispensing circuit phases.

Its design also prevents colorant leaking by creating an air tight seal. The higher liquid tolerances and better control of color dispense deliver the best results in color accuracy.


A wide range of canisters can be fitted on to each model, and future expandability can also be foreseen by selecting one of the many layouts of the turntable. This decision, to be taken during the ordering of the machine, can support the business as needs grow over time.

The FLEX 500 can fit up to 24 canisters, while the bigger FLEX 540 can host 32 canisters, or fewer canisters of bigger sizes. 2,5 liter and 5 liter are available.


Variations in colorant rheology combined with varying work environments and temperatures, makes in necessary to modify machine settings for optimal colorant performance. The suction and dispensing speed can be set from 1.000 to 5.000 seconds. Air cavitation effects are therefore minimized, avoiding costly mistints. Customers may select speed that best serves their unique requirements.

The single stirring function of the COROB™ FLEX 5xx series distinguishes it from any other machine on the market. The individually programmable stirring function works to ensure the nature of the colorant stays as true as possible. Well kept colorants offer multiple advantages: from maximizing colorant life, to assuring a perfect tint and an improved cost of ownership.

Smart technology allows the customer to set pre-programmed time and stir intervals for each colorant based on the unique factors of their business.

Optimized colorant stirring helps reduce hardening, residue build up and prevents sedimentation.


A streamlined design allows for simplified machine maintenance. A removable panel on the front of the machine provides easy access to the control boards, power units and the piston actuator motor.

The piston pump unit can be removed by simply closing the safety colorant sink and removing two screws. This avoids colorant from spilling out from the canister and requires very few steps to accomplish.

Machine components are located at waist level, eliminating the need for service people to bend down into uncomfortable and inconvenient positions. Other devices such as the table motor and stirring control boards have also been smartly positioned, so that minimal effort is required to reach them.


GRAVIMETRIC FUNCTIONFLEX 500 and FLEX 540 family of products also feature a gravimetric dispensing function. The embedded software controlling the unit can manage the connection to an external scale.
With gravimetric dispensing, the amount of each dispensed colorant is checked by an accurate weighing platform; the scale therefore gives a continuous feedback to the machine’s software. The machine dispenses colorant until the threshold level has been reached in order to obtain a certain formulation.
The gravimetric dispensing gives a precise order, which is often around 1% of the amount dosed or can be set until the scale reach a threshold of ±0.1gram. Overall this guarantees a continuous repeatability for each colorant and with a high accuracy standard.
Gravimetric systems are typically used by customers requiring a high and constant accuracy. Application nowadays are the ink-industry and in-plant tinting.
The gravimetric system works on the principle of starting from the information based on the amount needed for each colorant. From the total initial amount, 90% will be dispensed. Then the scale measures the dispensed amount and subtracts this from the total amount needed. The remaining amount will be dispensed again on 90% of this value. This process will be repeated until it reaches the required tolerance range or until a maximum number of attempts. Parameters can be adjust according to the customer’s requirements.


icon operator friendly


A complete set of safety switches makes using the dispenser friend proof for any operator, becoming an ideal working partner.

icon ideal ownership cost


The simple piston pumps can easily be changed over time without having to buy useless additional spare parts.

icon low-no voc colorant handling


The single nozzle dispense and the cleaning brush device help reduce colorant drying in the circuits, with a continuous correct tinting result.

icon maintence over time


The frame structure has been designed with many ‘easy to open’ access points for reaching the pumping groups, the electronic boards and the power supply unit.