Labthink NJY-20 Digital Torque Tester for Bottle Cap Opening and Closing Force Measurement
| Brand | Labthink |
|---|---|
| Model | NJY-20 |
| Torque Range | 20 Nm (standard), optional 40 Nm / 50 Nm |
| Accuracy Class | Grade 1 |
| Resolution | 0.001 Nm |
| Clamp Diameter Range | Φ5 mm to Φ170 mm |
| Test Count Memory | 1–9 samples (expandable via software) |
| Dimensions (L×W×H) | 350 mm × 240 mm × 140 mm |
| Weight | 19 kg |
| Power Supply | 220 VAC 50 Hz / 120 VAC 60 Hz |
| Compliance | GB/T 17876, ASTM D2063, ASTM D3198, ASTM D3474, BB/T 0025, BB/T 0034 |
Overview
The Labthink NJY-20 Digital Torque Tester is a precision-engineered instrument designed for quantitative measurement of opening and closing torque values in threaded closures—primarily bottle caps, pump dispensers, soft-tube nozzles, and screw-on lids used across beverage, pharmaceutical, cosmetic, and household product packaging. It operates on the principle of rotational force transduction using a calibrated load cell and high-stability torque sensor architecture, delivering repeatable measurements under controlled angular displacement and dynamic loading conditions. The device meets critical quality control requirements for both offline laboratory verification and inline process validation, ensuring that closure integrity aligns with functional performance standards—including resistance to accidental loosening during distribution, consumer usability, and seal retention under thermal or mechanical stress.
Key Features
- Microprocessor-controlled operation with real-time LCD display and intuitive PVC membrane keypad for rapid parameter setup and result visualization
- Dual-test mode: independent selection between “Opening Torque” (removal force) and “Closing Torque” (application force), each with automatic peak-hold functionality to capture maximum transient values
- High-resolution torque sensing system with 0.001 Nm resolution and Grade 1 accuracy per JJG 797–2013 (Chinese national metrological verification regulation), traceable to national standards
- Universal clamping mechanism accommodating cylindrical closures from Φ5 mm to Φ170 mm in diameter—compatible with PET bottles, HDPE pharmaceutical vials, aluminum cosmetic tubes, and vacuum-insulated tumbler lids
- Integrated safety logic including overload protection (120% FS), auto-zero calibration before each test cycle, and diagnostic error codes for sensor drift, motor stall, or communication failure
- Standard RS232 serial interface and built-in thermal mini-printer for immediate hard-copy output; supports bidirectional data exchange with Lystem™ Laboratory Data Management System (LDMS)
Sample Compatibility & Compliance
The NJY-20 is validated for use with all standard screw-threaded closure systems where torque-dependent sealing integrity is functionally significant. This includes but is not limited to carbonated beverage bottles (e.g., 38mm PCO 1881 caps), child-resistant pharmaceutical containers (ASTM D3474-compliant), collapsible aluminum tubes (BB/T 0034), and double-wall insulated drinkware (GB/T 17876). Its measurement methodology conforms to internationally recognized test protocols: ASTM D2063 (Standard Test Method for Measuring Opening Torque of Screw Caps), ASTM D3198 (for liner compression effects), and BB/T 0025 (Packaging—Plastic Caps for Carbonated Beverages). All firmware and calibration routines are documented per ISO/IEC 17025:2017 requirements for testing laboratories, supporting GLP/GMP audit readiness.
Software & Data Management
When paired with optional Lystem™ LDMS software, the NJY-20 enables full digital workflow integration: automated test sequence programming, statistical analysis (mean, SD, CV%, min/max), customizable report generation (PDF/Excel), and centralized database archiving with user-level access control. Audit trails record operator ID, timestamp, calibration status, and raw torque-vs.-time curves—fully compliant with FDA 21 CFR Part 11 for electronic records and signatures. Data export supports CSV, XML, and direct SQL server ingestion, facilitating enterprise-level quality analytics platforms such as TrackWise or MasterControl.
Applications
- Primary packaging QC: Verification of torque consistency across production batches of water, juice, dairy, and energy drink closures
- Pharmaceutical packaging validation: Ensuring tamper-evident cap removal force meets USP guidance on container closure integrity
- Cosmetic tube evaluation: Quantifying nozzle engagement torque for squeeze-trigger dispensers to prevent leakage or over-tightening damage
- Industrial fastener screening: Preliminary assessment of screw-mating torque in non-critical assemblies (e.g., appliance housings, medical device enclosures)
- R&D correlation studies: Correlating torque profiles with peel strength, leak rate, and shelf-life stability under accelerated aging conditions
FAQ
What torque ranges does the NJY-20 support out-of-the-box?
The standard configuration delivers a full-scale range of 20 Nm. Optional upgrade kits extend capacity to 40 Nm or 50 Nm—calibrated and certified separately.
Can the NJY-20 test non-cylindrical closures?
It is optimized for rotationally symmetric threaded components. Irregular geometries require custom fixturing, which may affect measurement repeatability and is not covered under warranty.
Is firmware upgradable in the field?
Yes—via RS232 connection using Labthink-provided update utilities. Version history and calibration certificate updates are logged automatically within the LDMS environment.
Does the instrument meet ISO 17025 traceability requirements?
Each unit ships with a factory calibration certificate referencing CNAS-accredited reference standards. Full traceability documentation is available upon request for accredited lab implementation.
How is thermal drift compensated during extended testing?
The torque sensor incorporates temperature-compensated strain gauge bridges and performs internal zero stabilization at start-up and after every 10-minute idle period.
