GBPI GBB-R – Plastic Melt Flow Indexer (MFR & MVR Melt Index Apparatus)
- Precision automated plastic melt flow indexer for thermoplastic melt mass and volume flow rate determination
- Full testing compliance with ASTM D1238, ISO 1133, GB/T 3682, and JB/T 5456
- Supports both MFR (Melt Mass Flow Rate) and MVR (Melt Volume Flow Rate) testing methodologies
- PID microprocessor temperature control from ambient to 450°C with accuracy of ±0.2°C
- Furnished with complete standard load weight combinations from 0.325 kg to 21.6 kg
- Precision high-resolution optical displacement encoder tracking piston travel for automated MVR acquisition
- Equipped with programmable automatic motorized extrudate cutting blade and tungsten carbide capillary die
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The GBPI GBB-R is a high-precision, electronically controlled plastic melt flow indexer engineered for the rapid, accurate determination of both melt mass-flow rate (MFR) and melt volume-flow rate (MVR) across thermoplastic polymer granules, powders, recycled flakes, and compound masterbatches. Manufactured in strict conformity with universally recognized polymer rheology standards including ASTM D1238 (standard test method for melt flow rates of thermoplastics by extrusion plastometer) and ISO 1133, this instrument is indispensable for raw resin grading and extrusion process control.
Thermoplastic resins exhibit substantial rheological variations depending on polymer chain branching, average molecular weight, additive packages, and thermal degradation history. In injection molding, film blowing, and pipe extrusion, resin lots with inconsistent melt flow indices cause erratic melt pressures, variable wall thicknesses, and high reject rates. Functioning as an advanced plastic melt flow indexer, the GBB-R melts a polymer sample inside a heated cylindrical barrel under controlled thermal equilibrium and extrudes the molten material through a standardized tungsten carbide capillary die under a designated static piston load.
Dual MFR and MVR Testing Capabilities
The instrument seamlessly executes both standardized operational modes. In MFR mode (Method A), an automated motorized rotary blade cleanly cuts extruded polymer strands at precise programmable time intervals for gravimetric mass determination. In MVR mode (Method B), a high-resolution optical linear encoder tracks the downward displacement velocity of the piston over a calibrated distance, computing volumetric flow rates without requiring manual extrudate weighing.
Advanced PID Thermal Control & Tungsten Carbide Tooling
The heating cylinder incorporates dual-zone resistance heating elements governed by fuzzy-logic PID controllers, ensuring temperature stability of ±0.2°C across the full 450°C spectrum. The precision bore barrel and standardized capillary die are manufactured from wear-resistant tungsten carbide, preventing dimensional drift even when compounding abrasive filled or glass-reinforced polymers.
Widely deployed by petrochemical petrochemical refineries, plastics compounders, recycling re-processors, and automotive molders, the GBB-R provides dependable rheological verification for consistent manufacturing excellence.
GBPI GBB-R Plastic Melt Flow Indexer – Technical Specifications
| Technical Parameter | Specification Details |
|---|---|
| Test Principle | Capillary Extrusion Plastometry (MFR Gravimetric & MVR Volumetric Methods) |
| Applicable Standards | ASTM D1238, ISO 1133, GB/T 3682, GB/T 9643, JB/T 5456 |
| Temperature Control Range | Ambient to 450°C (High-precision PID micro-furnace heating) |
| Temperature Fluctuation & Accuracy | ±0.2°C (Thermal gradient across test zone ≤ 0.5°C) |
| Temperature Display Resolution | 0.1°C (Precision platinum RTD sensor acquisition) |
| Measurement Range (MFR & MVR) | MFR: 0.1 to 200 g/10 min | MVR: 0.1 to 200 cm³/10 min |
| Standard Capillary Die Dimensions | Tungsten Carbide: Φ2.095 ± 0.005 mm (Internal), Length: 8.000 ± 0.025 mm |
| Test Barrel Bore Diameter | Φ9.550 ± 0.025 mm (Surface roughness: Ra < 0.2 μm) |
| Piston Head Diameter & Length | Φ9.475 ± 0.015 mm, Length of foot: 6.35 ± 0.10 mm |
| Standard Load Weights Included | 0.325 kg, 1.200 kg, 2.160 kg, 3.800 kg, 5.000 kg, 10.000 kg, 21.600 kg |
| Automatic Extrudate Cutting Mode | Motorized Rotary Cutter (Timing interval: 0.1 to 999.9 s programmable) |
| Displacement Transducer Resolution | 0.001 mm (High-accuracy optical linear scale for MVR calculation) |
| Overall Instrument Dimensions | 550 mm (L) × 420 mm (W) × 720 mm (H) |
| Total Instrument Net Weight | Approximately 45 kg (Excluding full weight stack) |
| Electrical Supply Requirements | AC 220V ± 10%, 50 Hz / 60 Hz Single Phase |
Key Performance Features of the GBPI GBB-R
- Dual MFR & MVR Multi-Method Capability: Supports standard gravimetric mass rate analysis (Method A) and high-throughput optical encoder volumetric rate testing (Method B) in a single benchtop unit.
- High-Precision Thermal Stability: Dual-zone PID micro-processor control ensures barrel temperature stability of ±0.2°C, exceeding the stringent temperature gradient limits of ISO 1133.
- Automated Motorized Cutting: Programmable automatic cutting blade slices extrudate cleanly at preset time intervals, eliminating operator reaction errors and timing distortions.
- Wear-Resistant Tungsten Carbide Die: Capillary die and barrel lining made from ultra-hard tungsten carbide resist abrasive wear from glass fibers, minerals, and carbon black additives.
- Complete Modular Test Weight Stack: Supplied with a full complement of precision-machined weights covering common test standards for PE, PP, PS, ABS, PC, PA, and POM.
- User-Friendly Touch Screen & Micro-Printer: Intuitive color touch-screen presents real-time temperature, displacement velocity, and flow rates with direct on-board thermal printout.
Standard Package & Accessories
| Item | Description | Quantity | Type |
|---|---|---|---|
| 1 | GBB-R Plastic Melt Flow Indexer Mainframe with Color Touchscreen | 1 Set | Standard |
| 2 | Standard Tungsten Carbide Capillary Die (Φ2.095 mm) | 1 Pc | Standard |
| 3 | Extrusion Piston Rod Assembly with Ground Foot | 1 Pc | Standard |
| 4 | Complete Modular Calibrated Load Weight Stack (0.325 kg to 21.6 kg) | 1 Set | Standard |
| 5 | Motorized Automatic Rotary Extrudate Cutting Unit | 1 Set | Standard |
| 6 | High-Resolution Optical Displacement Transducer (MVR Module) | 1 Set | Standard |
| 7 | Complete Cleaning Tool Set (Brass Barrel Rod, Die Push Rod, Gauze) | 1 Set | Standard |
| 8 | Factory Calibration Verification Certificate and User Guide | 1 Set | Standard |
Primary Testing Applications
Polyolefin Raw Material Grading
Verification of melt flow rate for virgin polyethylene (LDPE, LLDPE, HDPE) and polypropylene (PP) grades to classify film extrusion and molding suitabilities.
Engineering Plastics & Polyamides
Rheological testing of high-temperature engineering polymers including polycarbonate (PC), nylon (PA6, PA66), polyoxymethylene (POM), and PBT.
Recycled Plastics & Flake Reprocessing
Rapid melt volume rate (MVR) screening of post-consumer recycled resins (rPE, rPP, rPET) to monitor thermal degradation and molecular chain scission.
Masterbatch & Compound Quality Control
Verifying carrier resin compatibility and pigment dispersion viscosity in concentrated color and functional additive masterbatches.