Blenders - GRAVIMAX - Gravimetric Dosing
Advantages of GRAVIMAX Blenders
Simple operation
- Ingredient values entered as ratio or in percent via touch-screen.
- Changing recipes without stopping.
- Material data base, progress display.
- Storage of 100 recipes, inventory reports.
- Preset batch count.
Highly precise metering valves
Unique flow-valves made from stainless steel for high abrasive wear applications are extremely fast, efficient and consistently reliable. Major ingredients and additives are precisely metered to the desired set point.
Interchangeable steel hoppers
Self-closing valve mechanism offers easy cleaning and color change. The hopper is specially designed with no flow restricting or bridging parts in the hopper. Two convenient handles allow safe and easy material hopper handling.
"Clip-on" corner window
Unique "clip-on" corner window provides full view for material inspection. The corner window detaches quickly for simpler and easier cleaning access compared to other blender designs.
Easily removable weigh bin
Two weigh cell slide bars and a 60 ° discharge angle geometry provide complete emptying after each batch. The self-closing discharge flap mechanism prevents release of material from the weigh bin in the event of pressure loss.
Uniform material blending
Highly efficient bowl mixer provides a homogeneous material blend and allows for easy cleaning. The hemispherical geometry of the bowl mixer guarantees no dead spots or material hang-up.
RTLS Technology: Material Savings Reduce Cost
A unique 2-stage metering method achieves the most precise dispensing for batch-to-batch consistency and accuracy. This is accomplished by using progressively smaller dispensing algorithms to approach the target weight. Only one standard high precision valve is used for pellets, regrind, additives..
Step 1: Free Flow
Quick dispensing to near target weight (approximately 95%).
Step 2: Fine Pulsing
Controlled high frequency dispensing precisely to target.
Batch-to-batch accuracy means no overuse of high cost resins, optimizing the material consumption for the product requirement. Every batch is consistent and to the desired formula. No "hunting" or statistical averaging to achieve the required target.
Where Do the Savings Come From?
By ensuring batch-to-batch accuracy by means of RTLS (Real Time Live Scale) technology the operator can set the percentages to the required minimum level. As competitive blending methods are constantly overdosing and underdosing the minimum needs to be set to allow any underdosed batch to still be at the requested percentage. This results in overdosing all other batches, sometimes even significantly, causing tremendous excess material usage. RTLS can pay for itself in just a couple of months! In this example, a blend of 1.8% has been set. Real data demonstrates the difference between RTLS and other methods.
Standard Features
- Control of up to 8 components
- Dosing-technology - Precise metering through adaptive control algorithms.
- RTLS (Real Time Live Scale) technology - 2-stage progressive metering method for the most precise target weight.
- "On the go" feature - Change recipes and parameters without stopping production.
- Reports - Cycle, total run and inventory reports.
- Connectivity options (Ethernet) - Compatible with central PCs, PDAs, laptops.
- "SmartRegrind" mode - Automatic recipe adjustment, depending on the availability of the material.
- Mixing - Timed or continuous.
- User interface - The handling of the user interface is conform to the other WITTMANN manual control elements.
- Percent preset -Each ingredient value can be entered in percent or as ratio.
- Unit values - Operates in metric or imperial.
- Display operating conditions - Displays the recipe running, setpoint and actual values, process rate.
- Materials identification - Alphanumeric key pad for clear material identification.
- Recipe maintenance - 100 recipes stored on the local memory.
- Preset batch count - Automatic blender shutdown after reaching the preset batch count.
- Material bridging - Special dosing algorithms are loosening bridge formations of material in the hoppers.
- Security - 3 adjustable security levels with freely selectable access codes.
- High accuracy mode - Automatic adjustment of ratio to avoid an overdosing of expensive additives.
- Auto tuning - Independent adjustment of the dosing behaviour to varying flow characteristics of different materials.
- Secure mounting of the load cells for most exact measurement and long-lasting use.
- Control Panel with standard electrical components for reliable operation and easy maintenance.
- Power supply 110 V / 23 0 V / 1 / 50-60 Hz
