KR-722C Twin-Bore Capillary Rheometer (Dual Barrel Rheology Tester)
Dual Tube Capillary Rheometer
Dual Tube Capillary Rheometer
The RT-722C Dual Indenter Capillary Rheometer can be considered a relatively upgraded melt flow rate tester. The difference is that the melt flow rate tester can only test the fluidity of the material under a fixed load and a specific temperature, while the capillary rheometer can measure the rheology of the body under different shear rates and loads. Therefore, it can be used to study the temperature, pressure, and rate of the molding process to determine the molding process parameters, which cannot be met by the melt mass flow rate (which is commonly known as MFR/MFR/MVR).
Product Details：
Product Overview
The KR-722C dual-bore capillary rheometer is an advanced research-grade melt flow testing instrument, upgraded from single-barrel rheometer solutions to deliver higher testing precision and batch efficiency. Different from basic melt flow indexers that only capture fluidity under fixed temperature and load, this twin-channel model supports variable shear rate, pressure and temperature testing conditions, accurately measuring apparent viscosity, shear stress and extensional viscosity of molten polymers.
Equipped with two independent test barrels and twin servo plungers, the device enables parallel testing of two material samples or dual die simultaneous measurement. It automatically executes Bagley correction to eliminate inlet pressure error, outputting true viscosity data that perfectly simulates real extrusion, injection and blow molding production environments. Fully compliant with ISO 11443 and HG/T 4300 standards, it serves polymer R&D labs, modified plastic factories, rubber compound enterprises and third-party material certification institutions.
Core Competitive Advantages
- Twin-Bore Simultaneous Test Design, Higher Data Accuracy
Dual independent heating barrels and two synchronized servo plungers support two testing modes: parallel testing of two different raw materials, or matching long/short capillary dies for synchronous Bagley correction. Single-barrel equipment can only obtain apparent viscosity with inlet pressure interference, while this dual-channel model automatically calibrates pressure loss to acquire real melt viscosity, greatly improving data authenticity for formula research. Parallel testing cuts lab working time in half and supports direct side-by-side curve comparison.
- High-Stability H-Type Rigid Machine Frame
Integrated thick steel H-frame structure delivers outstanding structural rigidity under 5/10/20KN maximum driving force, effectively avoiding frame deformation during high-pressure extrusion that causes displacement error. Front split transparent heat shield doors enable easy sample loading and barrel cleaning, with full surrounding high-temperature warning protection to improve lab operation safety.
- Wide-Range Servo Drive & Precise Pressure Sensing
Closed-loop brushless servo system offers 0.001–500mm/min stepless adjustable plunger speed, paired with high-resolution pressure sensors (0.1MPa resolution, ±0.5%FS full-scale accuracy). The 1–50MPa pressure range covers low-viscosity polyolefin and high-hardness engineering plastic testing, supporting constant speed, constant pressure and manual three operation modes to meet diverse test schemes.
- Multi-Zone Precision Heating System
Independent segmented heating structure covers ambient temperature up to 400℃, with 1–10℃/min adjustable heating rate and 0.1℃ temperature display resolution. Uniform barrel temperature distribution eliminates local hot spots that trigger material degradation; fast temperature recovery shortens waiting time between batch tests, improving daily inspection throughput.
- Intelligent Multi-Curve Analysis Software
Dedicated PC control system collects real-time data of pressure, temperature, displacement and shear rate from both barrels simultaneously. It generates shear viscosity, extensional viscosity, stress-strain characteristic curves, supports linear/logarithmic axis one-click switching, multi-group curve overlay comparison and editable PDF report export. Open algorithm framework allows parameter correction for different polymer systems.
- Interchangeable Tungsten Carbide Capillary Dies
Complete standard die set with four specifications (Φ1×5 / Φ1×10 / Φ1×20 / Φ1×40mm) made of wear-resistant tungsten alloy, resisting abrasion from filled, flame-retardant and reinforced plastics. Custom plunger diameters and barrel sizes are available for low-temperature, ultra-high temperature or special viscosity testing requirements.
Full Technical Parameter Table
| Parameter Item | KR-722C Standard Configuration |
|---|---|
| Test Barrel Structure | Dual independent twin-bore, twin plunger drive |
| Temperature Scope | Room temperature ~ 400℃ |
| Heating Rate | 1 ~ 10℃/min, fast heating optional |
| Temperature Resolution | 0.1℃ |
| Test Pressure Range | 1 ~ 50MPa, tolerance ±0.5%FS |
| Optional Driving Force | 5KN / 10KN / 20KN |
| Pressure Resolution | 0.1MPa |
| Plunger Speed Range | 0.001 ~ 500 mm/min stepless regulation |
| Displacement Precision | ±0.5% Full Scale |
| Standard Plunger Diameter | φ12mm (customizable) |
| Plunger Cross Section Area | 113.04 mm² |
| Standard Capillary Dies | Φ1×5 / Φ1×10 / Φ1×20 / Φ1×40mm tungsten carbide |
| Rated Input Power | Below 1000W |
| Overall Dimension | 600 × 410 × 2100 mm |
Standard Complete Test Workflow
- Equipment Preheating & Parameter Setup
Install target capillary dies in two barrels, power on the heating system and hold constant temperature for 20 minutes to stabilize the barrel internal thermal field. Open supporting software to set test temperature, plunger speed and data recording frequency.
- Sample Filling & Sealing
Dry granular/pellet polymer samples to remove moisture, load equal mass material into two barrels separately and install plungers to avoid material leakage during extrusion.
- Parallel Automatic Extrusion Test
Start servo drive system; two plungers push molten material through matched dies synchronously. The system records pressure, displacement and temperature signals from both channels in real time throughout the whole extrusion cycle.
- Viscosity Calculation & Curve Comparison
After testing finishes, the software automatically executes Bagley correction to calculate true shear viscosity and extensional viscosity. Operators overlay curves of two samples to analyze differences in fluidity, processing performance and shear sensitivity.
- Data Storage & Report Export
Save all raw test data and characteristic curves locally, one-click generate standardized inspection reports containing core rheology indexes for laboratory filing and project technical analysis.
- Cooling & Complete Cleaning
Cool barrels down below 100℃, open front protective doors to disassemble dies and plungers, scrape residual molten plastic thoroughly to prevent cross-contamination of different formulas.
Main Application Fields
Modified Plastic & Masterbatch Enterprises
Test flow properties of PP, PE, ABS, PC, glass fiber reinforced and filled composites; optimize extrusion screw speed and molding temperature via rheology data.
Rubber & Elastomer R&D Labs
Measure melt viscosity of natural rubber, synthetic rubber and thermoplastic elastomers; analyze vulcanization fluidity and extrusion swell performance.
New Energy & High-Temp Engineering Material Institutes
Evaluate processing performance of PPS, PEEK, fluoroplastics and battery polymer binders under high-temperature shear conditions.
Packaging & Film Production Workshops
Simulate film blowing, pipe extrusion and injection molding shear environments to predict product shrinkage, surface defects and forming stability.
University & Third-Party Testing Institutions
Complete standard compliance testing per ISO 11443 and HG/T 430; conduct new material rheology research and student teaching experiments.
Standard Factory Delivery Kit
- KR-722C twin-bore capillary rheometer main H-frame host
- Dual servo drive plunger assembly + two independent heating barrels
- Full set of 4 standard tungsten carbide capillary dies
- Industrial control computer + dedicated rheology analysis software U disk
- High-precision pressure sensing module and temperature control system
- Split transparent heat shield doors and safety emergency stop assembly
- Complete barrel cleaning tools and spare sealing accessories
- Multilingual operation manual complying with international rheology standards
- Factory calibration inspection certificate
Global Distributor & After-Sales Support
We provide one-on-one remote operation training and multi-die test parameter debugging guidance, with long-term stable supply of tungsten carbide dies, servo motors and temperature sensors. Custom low-temperature (-50℃) or ultra-high-temperature (500℃) upgraded versions and 60Hz overseas power conversion models are available for bulk orders. Exclusive regional agent policies include priority production scheduling, OEM private brand customization and full HD product marketing image packages.
English Overlay Text For All Product Pictures
Main Banner Title: KR-722C Twin-Bore Capillary Rheometer Dual Barrel Rheology Tester
Control Panel Tags: TEMP SET / SPEED RANGE / DIE SELECT / DUAL CURVE COMPARE / REPORT PRINT
Feature Overlay Tags: Synchronous Dual Barrel Test / Automatic Bagley Correction / H Rigid Frame / 0.001~500mm/min Speed / ISO HG/T Compliant
Safety Operation Tip: Fully Cool Barrels Before Opening Doors For Cleaning
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