GE FGB-M05 manual 1.0INTRODUCTION GRAVIMETRIC FEEDING, Fgb Series Gravimetric Blenders

Rev. May 2001	GraviMaster-FGB-M05 (S)	Page 3
	Gravimetric Blender

1.0INTRODUCTION GRAVIMETRIC FEEDING

An efficient materials blending system is an essential feature of the modern plastics processing industry. Dosing each component on the basis of weight shows distinct advantages over traditional volumetric systems. The quantity of material delivered is precise and unaffected by variations in bulk density, flow characteristics and particle size.

Ferlin Plastics Automation now have a range of more than twenty blenders that deliver the benefits of gravimetric blending at a price that makes other gravimetric ... and most volumetric systems ... look distinctly expensive.

FGB SERIES GRAVIMETRIC BLENDERS

“GraviMaster” blending systems are available in more than twenty different models with a throughput capacity range from 10 to 750 kg/hr for the standard units. The number of components on the standard unit is two to six. But purpose-built units may designed for additional feeds up to a maximum of ten and a throughput capacity up to 1500 kg/hr.

The blending units may either flow-control-valve design or have a combination with auger-feeders. The proven “GraviMaster” blending systems are being used successfully in Injection-moulding, Blow-moulding, Sheet-extrusion and Film-extrusion.

ACCURATE WEIGH SYSTEM

Each component is dispensed into a weigh-pan using one set of load cells. When all the components are correctly weighed, the blend is discharged into a mixing chamber. A high efficiency horizontal mixer is programmed to give a uniform blend which discharges to a storage bin with suction device, or directly into the processing machine hopper.

The system is capable of extremely accurate measurements of additive, even at very small percentages or ratios. Load cells of the highest accuracy are used, weighing to within

0.01gm. The accuracy of the process is enhanced by the software system which is designed to compensate in a subsequent batch for any errors arising in a preceding batch. Overall accuracy of 0.1% can be achieved.

COMPACT AND MODULAR CONSTRUCTION

The units are designed and built as a modular construction using standard components where possible, so that all components are readily obtainable. All components which are in contact with the raw material are made in stainless steel. This includes hoppers, valves, augers, weigh pan, mixer and mixing chamber. When auger feeders are installed, these can be quickly accessed for easy cleaning. The mixing chamber and weigh pan can be removed easily for cleaning and access. The construction is in accordance with the essential requirements under the CE regulations.