Control your Extruder
Control Product Quality
Save over 2% Raw Material
Quick Job Changes
The gravimetric extrusion control system utilizes the loss in weight principle to control and maintain a consistent weight or thickness of your extruded product. The Gravimetric Extrusion Control system will maintain your product weigh to better than +/- 0.5% of target.
The Gravimetric Extrusion Control will automatically react to variations in material bulk density, extruder back pressure, ambient conditions and any other influence to extruder output stability to maintain your product consistency.
How It Works
The Gravimetric Extrusion Control System sits between the material storage hopper and the extruder throat. The Gravimetric Extrusion Control System monitors the loss in weight of the material in its weigh chamber and from this calculates the mass throughput rate of the extruder. In Auto Control mode Gravimetric Extrusion Control System can control the extruder or the process line speed to maintain a set output or a set product weight per unit length.
When the weight of material in the weigh chamber falls below a preset value a slide valve opens and refills the chamber from the material storage hopper.
To prevent damage to the load cells the Gravimetric Extrusion Control System has a protective outer hopper made from powder coated zinc plated steel. The inner weigh chamber and the inlet slide valve are made from 304 grade stainless steel. The control electronics are mounted in a cabinet attached to the outer hopper.
Interface Modules
In order to operate the Gravimetric Extrusion Control System controller needs input from the process: The extruder screw speed and the process line speed. In order to control it needs to be able to change the extruder screw or process line speed. There are many ways this can be done depending on the control wiring for the main system.
Rather than run potentially hazardous signals from the main electrical cabinet to the Gravimetric Extrusion Control System controller, a set of interface modules are installed in the main electrical cabinet and a low voltage communications cable run to the Gravimetric Extrusion Control System.
All control signals are optically isolated. Speed input modules can use digital pulses or analogue voltage input. Extruder and line control can be by motorized potential meter, digital output, relay output or analogue output.
Control Outputs
Fundamental to the design of Gravimetric Extrusion Control System is the philosophy that when not in Auto Control mode, the extruder or line speed control should revert to the normal operator control. To best achieve this Gravimetric Extrusion Control System uses control signals to increase or decrease the speed rather than setting an absolute speed using an analog reference output. The preferred control outputs are motorized potential meter (for older lines) or direct ramp up/down digital inputs to the line PLC (for newer lines). Analog control output is the least desirable option because it almost impossible to avoid a step change of speed when changing from Auto to Manual control mode.
Features:
The Gravimetric Extrusion Control System will control your extruded product to +/- 0.5% of target by adjusting either the extruder screw speed or the line speed thus maintaining your product quality and eliminate over weight/usage.
Automatically compensates for process variations caused by raw material bulk density variation, extrusion back pressure, ambient conditions and any other factors affecting extruder output stability.
Very quick responce time which can shorten job change and set up time by more than 30% resulting in increased production time and reduced waste.
The weigh hopper is complete lt enclosed by a metallic hopper to isolate it from external interference and provides mechanical protection of the load cells giving you a long and reliable service life.
Integrated adapter flange for feed throat mounting , top flange designed to mount machine hopper or blender.
Specifications
Standard models for 100, 200, 400 & 800 kg/hr.
Throughput or weight per metre control standard.
Dynamic parts in contact with the material are stainless steel.
Static parts in contact with the material are powder coater steel.
Power supply single phase 230 V, 50 Hz std.
Pneumatic air supply 6 bar, regulator supplied
Options
Output control modules for 10 turn potential meter, push bottom or PLC speed control.
Thickness display for film applications, requires entry of width and density.
Wall thickness display for pipe applications, requires entry of diameter and density.
Remote mounted operator controls.
High temperature version for hot dried material.
Manufacturers of gravimetric control systems to control linear weight or thickness during extrusion or coextrusion. Offer integrated systems for plant data acquisition of material consumption. Portugal. Systems for gravimetric dosing and control of meter weight in film, sheet, pipe and profile extrusion, feeding technology, width and thickness profile measurement and control applications. Manufacture control systems for extrusion presses in the aluminium, copper and brass extrusion industries.
Systems for gravimetric dosing and control of meter weight in film, sheet, pipe and profile extrusion, feeding technology, width and thickness profile measurement and control applications. Manufacturers of gravimetric control systems to control linear weight or thickness during extrusion or coextrusion. Offer integrated systems for plant data acquisition of material consumption. Portugal. Manufacture control systems for extrusion presses in the aluminium, copper and brass extrusion industries.
Systems for gravimetric dosing and control of meter weight in film, sheet, pipe and profile extrusion, feeding technology, width and thickness profile measurement and control applications. Manufacturers of gravimetric control systems to control linear weight or thickness during extrusion or coextrusion. Offer integrated systems for plant data acquisition of material consumption. Portugal. Germany. Design and manufacture of plants for single and multi-layer blown polymer film extrusion. Technical information and machine specifications. Links to related sites. Part of Kiefel AG. English, German and French.
Systems for gravimetric dosing and control of meter weight in film, sheet, pipe and profile extrusion, feeding technology, width and thickness profile measurement and control applications. Manufacturers of gravimetric control systems to control linear weight or thickness during extrusion or coextrusion. Offer integrated systems for plant data acquisition of material consumption. Portugal. Manufacturers of extrusion process management technology and control software for weight control of finished product.
