Labthink C631H Thermal Shrinkage Tester for Plastic Films

Overview

The Labthink C631H Thermal Shrinkage Tester is a precision-engineered instrument designed for the quantitative evaluation of dimensional stability and mechanical response of thermally sensitive polymeric films under controlled thermal excursions. It operates on the principle of simultaneous, real-time monitoring of axial force generation (thermal shrinkage force and cold shrinkage force) and dimensional change (linear shrinkage rate) during programmed heating and cooling cycles. Unlike conventional oven-based shrinkage assessments, the C631H integrates calibrated force transduction, non-contact laser displacement sensing, and closed-loop temperature control within a single test chamber—enabling traceable, reproducible measurements aligned with international standard methodologies. Its architecture is specifically optimized for thin-gauge flexible packaging materials—including polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), oriented polystyrene (OPS), and polyvinyl chloride (PVC)—where precise prediction of post-forming behavior (e.g., label fit, pouch integrity, tamper evidence) is critical to functional performance.

Key Features

• Non-contact laser displacement measurement system ensures high-resolution, drift-free tracking of sample contraction without mechanical interference or surface contact artifacts.
• High-stability force sensing platform using globally certified load cells (standard 5 N; optional 10 N or 30 N ranges), delivering force accuracy of ±0.5% of reading (10–100% full scale) and ±0.05% FS at low-force regimes—essential for detecting subtle pre-shrink transitions in low-shrink films.
• Dual-sensor synchronized acquisition: simultaneous recording of thermal shrinkage force, cold shrinkage force, temperature, and linear displacement at user-defined sampling intervals (down to 100 ms).
• Precision temperature control module with ±0.2 °C stability and ±0.5 °C accuracy (single-point calibrated), covering an operational range from ambient to 210 °C—sufficient for high-melting-point shrink films and crosslinked systems.
• Embedded Windows-based computing platform eliminates external PC dependency; includes integrated display, keyboard, and mouse for stand-alone operation, data visualization, and report generation.
• Intelligent sensor calibration prompting and automated zero-drift compensation ensure long-term metrological integrity across extended testing campaigns.
• Modular hardware design supports rapid tooling exchange: standardized T-type sample holders and high-temperature welding fabric enable consistent clamping geometry and thermal uniformity across diverse film substrates.

Sample Compatibility & Compliance

The C631H is validated for use with mono- and multilayer thermoplastic films ranging from 12 µm to 250 µm thickness, conforming to the geometric requirements of GB/T 34848 (Chinese National Standard, co-drafted by Labthink), ISO 14616:1997 (Plastics — Film and sheet — Determination of shrinkage stress), and DIN 53369:1976 (Testing of plastics — Determination of shrinkage of films). Each test station accommodates two parallel specimens (110 mm × 15 mm), allowing comparative analysis under identical thermal profiles. The system meets essential regulatory expectations for method validation in quality-controlled environments: raw data are timestamped, uneditable, and stored locally with audit-trail capability. Optional DataShield™ integration enables secure export to LIMS or ERP platforms compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures.

Software & Data Management

The embedded software provides real-time graphical overlay of force vs. time, displacement vs. time, and temperature vs. time curves—with synchronized cursor interrogation for point-specific parameter extraction (e.g., peak shrinkage force, onset temperature, final shrinkage %). All test configurations—including ramp rates, dwell times, cooling profiles, and sensor scaling—are saved as reusable method templates. Historical datasets support filtering by date, operator, material grade, or standard reference. Reports comply with GLP documentation standards: each PDF export includes instrument ID, calibration status, environmental conditions, raw curve plots, summary statistics (mean, SD, CV%), and digital signature fields. USB 2.0 and Ethernet interfaces facilitate firmware updates, bulk data export, and remote diagnostic access—without compromising local data sovereignty.

Applications

• Quantification of heat-seal integrity loss during thermal processing in retortable pouches.
• Evaluation of label film compatibility with container curvature changes during hot-fill bottling.
• Comparative assessment of shrink tension development across different polymer grades (e.g., LDPE vs. LLDPE blends) under identical thermal histories.
• Validation of shrink tunnel parameters (temperature profile, dwell time, air velocity) via correlation with measured shrink force and rate.
• Stability testing of shrink sleeves used in pharmaceutical secondary packaging under accelerated aging conditions.
• Root-cause analysis of delamination or wrinkling in multilayer barrier films during thermoforming.

FAQ

What standards does the C631H directly support?
GB/T 34848, ISO 14616:1997, and DIN 53369:1976.
Can the instrument measure both heating and cooling phase shrinkage forces?
Yes—it captures thermal shrinkage force during heating, cold shrinkage force during controlled cooling, and residual dimensional change after thermal equilibration.
Is calibration traceable to national metrology institutes?
Force and temperature sensors are supplied with factory calibration certificates; optional NIST-traceable recalibration services are available through Labthink’s global service network.
How is data security ensured during long-term deployment?
DataShield™ (optional) enforces role-based access control, encrypted local storage, and immutable audit logs; all test data reside exclusively on the instrument’s internal SSD unless explicitly exported.
What sample preparation tools are included?
Standard configuration includes a sample cutter, high-temperature welding fabric, ten T-type sample holders, and alignment jigs—ensuring repeatable specimen mounting per ISO 14616 Annex A.