Labthink C631H Thermal Shrinkage Tester for Plastic Films

Overview

The Labthink C631H Thermal Shrinkage Tester is a precision-engineered instrument designed for quantitative evaluation of thermal shrinkage behavior in polymeric films and laminates used in packaging, labeling, and protective applications. It operates on the principle of controlled thermal exposure followed by simultaneous measurement of dimensional change (shrinkage strain), tensile force generation (thermal shrink force), and residual contraction upon cooling (cold shrink force). This dual-parameter acquisition—force and displacement—is synchronized with real-time temperature profiling to deliver traceable, standards-aligned data per GB/T 34848, ISO 14616:1997, and DIN 53369:1976. As the primary contributor to GB/T 34848, Labthink ensures metrological rigor in both hardware architecture and test methodology—enabling laboratories to meet regulatory expectations for material qualification, process validation, and quality control in regulated manufacturing environments.

Key Features

• Non-contact laser-based displacement sensing for high-reproducibility shrinkage rate measurement (0.1–95%), eliminating mechanical interference and wear-related drift
• Imported high-accuracy load cell with class ≤0.5 force accuracy (per ISO 376), calibrated across multiple ranges (5 N standard; 10 N / 30 N optional) for reliable quantification of thermal shrink forces ≥0.01 N
• Triple-speed specimen insertion mechanism (2 s fastest cycle time) minimizing thermal gradient disturbance during loading
• Integrated PID-controlled heating chamber with ±0.2 °C stability and ±0.5 °C absolute accuracy (single-point calibrated), supporting tests up to 210 °C
• Embedded Windows-based control system with native GUI—no external PC required; includes touchscreen-ready display, keyboard, and mouse
• Real-time multi-parameter plotting: thermal shrink force, cold shrink force, shrinkage percentage, and chamber temperature versus time
• Onboard USB 2.0 and Ethernet interfaces for secure data export, remote diagnostics, and LIMS integration
• Smart sensor calibration alert system with audit-trail logging compliant with GLP/GMP documentation requirements

Sample Compatibility & Compliance

The C631H accommodates standard specimens measuring 110 mm × 15 mm, conforming to dimensional requirements in all referenced standards. Its dual-station design enables parallel testing of two specimens under identical thermal profiles—enhancing throughput while maintaining inter-test comparability. The system supports films ranging from biaxially oriented polypropylene (BOPP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), to multilayer coextrusions. All firmware and calibration protocols are validated against national metrology institutes’ traceability chains. The instrument satisfies technical prerequisites for ISO/IEC 17025-accredited laboratories and aligns with FDA 21 CFR Part 11 data integrity principles when paired with optional DataShield™ software modules (e.g., electronic signatures, role-based access control, immutable audit logs).

Software & Data Management

The embedded operating system features a dedicated thermal shrinkage analysis suite with automated calculation of key metrics: percent shrinkage (L₀−L₁)/L₀ × 100, peak thermal shrink force, equilibrium cold shrink force, and time-to-peak response. Historical datasets are indexed by batch ID, operator, date/time stamp, and environmental conditions. Reports comply with ASTM E2500-18 formatting conventions and export natively to PDF, CSV, or XML. Optional DataShield™ integration provides centralized database synchronization, automated backup to network drives, and API-driven interoperability with enterprise QMS platforms (e.g., TrackWise, MasterControl). All raw sensor data—including timestamped 10 Hz force/displacement/temperature streams—are retained locally on encrypted internal storage, physically isolated from general-purpose computing functions to prevent OS-level corruption or malware propagation.

Applications

• Quantifying shrink force profiles of heat-shrink sleeves used in beverage can labeling and pharmaceutical blister packaging
• Evaluating thermal stability of shrink films during retort or pasteurization processes
• Comparative assessment of shrink onset temperature and contraction kinetics across resin grades and additive formulations
• Validating shelf-life performance of shrink-wrapped medical device pouches under accelerated aging conditions
• Supporting root-cause analysis of package deformation or label misalignment in high-speed filling lines
• Generating input parameters for finite element modeling (FEM) of thermo-mechanical film behavior

FAQ

What standards does the C631H directly support?
It is fully compliant with GB/T 34848 (Chinese National Standard, co-drafted by Labthink), ISO 14616:1997, and DIN 53369:1976 for thermal shrinkage testing of plastic films.
Can the instrument measure both hot and cold shrink forces in a single test cycle?
Yes—each test automatically captures thermal shrink force during heating, holds at target temperature, then records cold shrink force during controlled cooling, all within one uninterrupted sequence.
Is external computer connectivity mandatory for operation?
No—the C631H is a self-contained system with integrated display and controls; external PCs are only required for advanced data archiving or LIMS interfacing via optional modules.
How is data integrity ensured in case of power failure or system crash?
All measurements are buffered in non-volatile memory prior to disk write; unsaved data is preserved across reboots, and file writes follow atomic-commit protocols to prevent partial corruption.
Are calibration certificates provided with the instrument?
Each unit ships with a factory-issued calibration report traceable to CNAS-accredited reference standards; annual recalibration services include full uncertainty budget documentation.