HunterLab SpectraTrend HT Online Color Measurement System for Polyethylene, Polypropylene & Plastic Pellets
| Brand | HunterLab |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | SpectraTrend HT |
| Product Type | Spectrophotometric Colorimeter |
| Instrument Type | In-line |
| Optical Geometry | 0°/45° Integrating Sphere |
| Light Source | Full-spectrum Balanced Solid-State LED System |
| Spectral Range | 400 nm – 700 nm |
| Repeatability | ΔE*ab ≤ 0.03 |
Overview
The HunterLab SpectraTrend HT is an industrial-grade in-line spectrophotometric color measurement system engineered for continuous, non-contact color and height monitoring of free-flowing plastic pellets—including polyethylene (PE), polypropylene (PP), and other thermoplastic granules—on extrusion, blending, or conveying lines. Operating on the CIE 1931 2° standard observer and D65 illuminant, it employs a precision 0°/45° optical geometry with an integrating sphere to deliver laboratory-grade spectral reflectance data (31-point spectrum at 10 nm bandwidth) under dynamic production conditions. Unlike benchtop colorimeters, the SpectraTrend HT integrates real-time spectral acquisition, height-compensated color correction, and automated calibration into a single ruggedized platform designed for 24/7 operation in demanding polymer processing environments.
Key Features
- Non-contact, high-speed measurement at up to 5 Hz—enabling continuous capture of color and physical height on moving pellet streams without mechanical interference or sample contact.
- Integrated height-sensing capability: detects object distance (up to 100 mm working distance) and dynamically compensates for spectral deviation caused by vertical displacement, conveyor belt vibration, or irregular feed height.
- Full-spectrum solid-state LED illumination (400–700 nm) with stable spectral output and >50,000-hour lifetime—eliminating lamp drift and reducing maintenance intervals.
- NEMA 4 / IP56-rated enclosure for dust- and water-resistant operation in ambient temperatures from 0 °C to 50 °C and relative humidity up to 90% non-condensing.
- Automated self-calibration with user-defined scheduling—removing dependency on manual recalibration and supporting uninterrupted process validation per FDA 21 CFR Part 11 and GMP-aligned workflows.
- Multi-sensor network support via standard Ethernet (TCP/IP); no serial port dependency or cable-length limitations—enabling centralized data aggregation across multiple production lines.
Sample Compatibility & Compliance
The SpectraTrend HT is validated for use with heterogeneous, semi-opaque, and irregularly shaped particulates typical of PE/PP pellet streams—including virgin resin, regrind, masterbatch blends, and color-concentrated granules. Its optical design accommodates variable particle size distribution (typically 2–8 mm diameter), surface texture variation, and transient occlusion effects common in gravity-fed or pneumatic conveyance systems. The system complies with ISO 11664 (CIE colorimetry standards), ASTM D2244 (standard practice for calculation of color tolerances), and supports alignment with ICH Q5, Q8, and Q9 frameworks for Process Analytical Technology (PAT). Audit trails, electronic signatures, and configurable user roles in EasyMatch QC software facilitate compliance with GLP, GMP, and 21 CFR Part 11 requirements.
Software & Data Management
HunterLab EasyMatch QC software serves as the central interface for configuration, visualization, and statistical analysis. It displays real-time L*a*b*, ΔE*ab, and height values with Pass/Fail status based on user-defined tolerances. Data outputs include spectral curves, trend charts (X-bar/R, SPC), batch-level reports, and tabular export to Microsoft Excel (.xlsx) or CSV. Customizable report templates support internal QA documentation, supplier scorecards, or regulatory submissions. All measurements are time-stamped, sensor-identified, and stored with full metadata—including calibration history, environmental logs, and operator credentials—enabling traceability and root-cause analysis during deviation investigations.
Applications
The SpectraTrend HT is deployed across polymer manufacturing stages where color consistency directly impacts product acceptance and regulatory compliance: real-time monitoring of extruded PE/PP pellets prior to packaging; detection of off-spec color shifts during masterbatch dilution; verification of color stability during recycling stream blending; and closed-loop feedback control integration with PLCs for automatic resin feed adjustment. Beyond plastics, its height-compensated architecture supports validated use in food (e.g., cereal, baked goods, frozen entrées), pharmaceutical excipients, coated metal flakes, vinyl flooring, and paperboard—where surface topography and spectral response must be decoupled for accurate color assessment.
FAQ
What is the maximum working distance between the sensor head and the pellet stream?
The SpectraTrend HT maintains optimal performance at a standoff distance of up to 100 mm (4 inches), with automatic height compensation active across the full range.
Does the system require periodic physical calibration using reference tiles?
No—automated electronic calibration eliminates routine tile-based verification; however, NIST-traceable ceramic standards are recommended for annual verification per ISO/IEC 17025.
Can SpectraTrend HT data be integrated into MES or SCADA platforms?
Yes—via Modbus TCP, OPC UA, or custom REST API integration through EasyMatch QC’s middleware layer.
How does the instrument handle background interference from conveyor belts or trays?
The system uses intelligent background subtraction algorithms that isolate target sample reflectance by suppressing signal contributions from known substrate spectra.
Is spectral data stored locally or only accessible via network connection?
Raw spectra and metadata are buffered onboard and synchronized to network storage; local SD card logging is available as an optional fail-safe backup.
