Qinji QJRZ-45 Melt Flow Indexer
| Brand | Qinji |
|---|---|
| Origin | Shanghai, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | QJRZ-45 |
| Quotation | Available upon Request |
| Temperature Range | 0–300 °C |
| Temperature Stability | ±0.5 °C |
| Temperature Resolution | 0.1 °C |
| Barrel Diameter | Φ9.55 mm ±0.025 mm |
| Die Orifice Diameters | Φ2.095 mm ±0.005 mm and Φ1.180 mm ±0.010 mm |
| Power Supply | AC 220 V, 50 Hz |
| Dimensions (W×D×H) | 250 mm × 400 mm × 500 mm |
| Net Weight | 35 kg |
Overview
The Qinji QJRZ-45 Melt Flow Indexer is a precision-controlled thermal-mechanical instrument engineered for the standardized determination of melt mass flow rate (MFR) and melt volume flow rate (MVR) of thermoplastic polymers under defined temperature and load conditions. Based on the fundamental principle of extrusion rheometry—where molten polymer is forced through a calibrated capillary die under constant gravitational or piston-driven load—the system quantifies flow behavior as mass (g/10 min) or volume (cm³/10 min) over a fixed time interval. This method provides a critical, reproducible index of polymer processability, molecular weight distribution, and thermal stability during extrusion, injection molding, and compounding operations. Designed for rigorous laboratory and quality control environments, the QJRZ-45 complies with ISO 1133-1:2011 and ISO 1133-2:2011 (for MFR and MVR, respectively), as well as GB/T 3682.1–2022 and GB/T 3682.2–2022, ensuring alignment with international regulatory expectations in polymer manufacturing and third-party certification workflows.
Key Features
- High-stability heating system with PID-controlled furnace, maintaining ±0.5 °C temperature uniformity across the 0–300 °C operating range—critical for high-melting engineering resins such as polycarbonate, polyarylsulfone, fluoropolymers, and nylon.
- Dual-capillary die configuration: interchangeable dies with nominal orifice diameters of 2.095 mm ±0.005 mm and 1.180 mm ±0.010 mm, both manufactured to ISO 1133 geometric tolerances and traceable to national metrological standards.
- Precision-machined barrel (Φ9.55 mm ±0.025 mm) constructed from high-temperature alloy steel, optimized for dimensional stability and resistance to thermal creep during prolonged testing cycles.
- Integrated digital temperature display with 0.1 °C resolution and real-time monitoring capability—enabling operator verification prior to and during test execution per GLP documentation requirements.
- Compact benchtop footprint (250 mm × 400 mm × 500 mm) and 35 kg net weight facilitate integration into QC labs with space constraints while maintaining mechanical rigidity for consistent plunger travel and load application.
Sample Compatibility & Compliance
The QJRZ-45 supports a broad spectrum of thermoplastic materials, including but not limited to polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS, polyoxymethylene (POM), polycarbonate (PC), polyphenylsulfone (PPSU), and polytetrafluoroethylene (PTFE)-based compounds. Its extended temperature range enables reliable MFR/MVR assessment of both commodity and high-performance polymers without thermal degradation artifacts. All mechanical dimensions—including barrel bore, die geometry, and piston clearance—are validated against ISO 1133 Annex A specifications. The instrument meets essential requirements for ISO/IEC 17025-accredited testing laboratories and supports audit-ready documentation for GMP-compliant polymer production facilities governed by FDA 21 CFR Part 211 and ICH Q5E guidelines.
Software & Data Management
While the QJRZ-45 operates in standalone mode with manual timing and gravimetric measurement, it is fully compatible with optional PC-based data acquisition modules that support timestamped test logging, automatic MFR/MVR calculation, and CSV export. These modules implement electronic audit trails compliant with FDA 21 CFR Part 11 for signature capture, user access control, and change history—ensuring data integrity in regulated environments. Calibration records, die serial numbers, and temperature validation logs can be archived alongside raw mass/time entries to satisfy internal QA protocols and external inspection demands.
Applications
- Raw material acceptance testing for incoming polymer resin batches against supplier specifications.
- In-process monitoring of melt index drift during polymerization or reactor-grade transitions.
- Quality assurance of recycled polymer streams where thermal history affects rheological consistency.
- Comparative analysis of batch-to-batch variability in compound formulations containing fillers, plasticizers, or flame retardants.
- Supporting technical service functions in polymer extrusion line troubleshooting and screw design validation.
FAQ
Does the QJRZ-45 comply with ASTM D1238?
Yes—the instrument’s mechanical configuration, temperature control, and die specifications are fully aligned with ASTM D1238-22, particularly Method A (mass-flow rate) and Method B (volume-flow rate), when used with appropriate calibration weights and timing procedures.
Can the system be validated for ISO/IEC 17025 accreditation?
Yes—its traceable dimensional tolerances, documented temperature uniformity profiles, and compatibility with certified reference materials (e.g., NIST-traceable polystyrene standards) enable full scope validation per ISO/IEC 17025:2017 Clause 6.4 and 6.5.
What maintenance is required to sustain long-term accuracy?
Routine cleaning of the barrel and die with brass brushes and solvent wipes is recommended after each test series; annual verification of temperature sensor calibration and die orifice metrology using optical interferometry or coordinate measuring machines is advised for regulated use.
Is technical support available outside China?
Yes—Qinji authorizes regional service partners in North America, Europe, and Southeast Asia for installation, IQ/OQ documentation, and preventive maintenance; remote diagnostics and SOP development assistance are provided via secure web portal.
