HAIDA HD-D014 Liquid Rewet Tester

Overview

The HAIDA HD-D014 Liquid Rewet Tester is a precision-engineered instrument designed to quantify the rewet performance of topsheet materials used in absorbent hygiene products—particularly infant diapers and adult incontinence pads. It operates on the principle of simulating post-absorption liquid migration under controlled mechanical load, measuring the mass of liquid that migrates back through the topsheet surface after initial absorption. This test directly evaluates the material’s ability to maintain dryness at the skin interface—a critical functional parameter governed by international standards including GB/T 24218.14 (Textiles — Nonwovens — Part 14: Determination of Rewet of Cover Materials) and ISO 9073-14 (Textiles — Test methods for nonwovens — Part 14: Determination of rewet of top sheet materials). The instrument replicates physiological loading conditions using a pneumatically actuated 200 g weight, mimicking typical pressure exerted by an infant’s body during wear, thereby ensuring clinical relevance and regulatory alignment.

Key Features

• Intuitive 7-inch capacitive touchscreen interface with bilingual (English/Chinese) menu navigation and real-time status feedback—designed for rapid operator training and consistent protocol execution.
• Integrated thermal line printer enables immediate hard-copy documentation of test results, supporting on-site quality verification and audit-ready recordkeeping.
• High-resolution load cell with ±0.001 g repeatability, housed within a draft-shield enclosure to eliminate environmental interference from air currents or vibration.
• Pneumatic actuation system ensures precise, repeatable application and removal of the standardized 200 g test weight—eliminating manual handling variability and enhancing inter-laboratory reproducibility.
• Microstepping motor-driven positioning mechanism maintains strict compliance with the vertical displacement speed and dwell time requirements specified in GB/T 24218.14 and ISO 9073-14.
• Onboard calibration routine—traceable to internal reference masses—allows daily verification without external calibration tools, reducing downtime and supporting GLP-compliant operation.

Sample Compatibility & Compliance

The HD-D014 accommodates standard 100 mm × 100 mm nonwoven topsheet specimens mounted on a rigid test plate. Compatible substrates include spunbond, meltblown, SMS laminates, and apertured films commonly used in hygiene product manufacturing. All mechanical and timing parameters conform strictly to the procedural mandates of GB/T 24218.14 and ISO 9073-14, including pre-conditioning humidity control (50% RH ± 2%, 23°C ± 1°C), synthetic urine formulation (0.9% NaCl solution, pH 6.0 ± 0.2), and defined absorption/rewet timing sequences. The system supports full traceability for regulatory submissions and satisfies documentation requirements under ISO/IEC 17025-accredited testing laboratories.

Software & Data Management

While the HD-D014 operates as a standalone benchtop unit with embedded firmware, its digital architecture supports data export via USB interface in CSV format—enabling seamless integration into LIMS or statistical process control (SPC) platforms. Timestamped test records include specimen ID, ambient conditions, measured rewet mass (g), operator ID, and calibration status. Audit trails are retained onboard for ≥1,000 tests, fulfilling basic data integrity expectations aligned with FDA 21 CFR Part 11 principles for non-electronic-signature environments. Optional PC-based software (HAIDA TestSuite v2.1) provides graphical trend analysis, batch reporting, and customizable certificate generation.

Applications

• Quality assurance of diaper topsheets during R&D and production release testing.
• Comparative evaluation of hydrophobic treatment efficacy across nonwoven suppliers.
• Process validation for plasma coating, silicone finishing, or embossing parameters affecting rewet resistance.
• Stability assessment of material performance after accelerated aging (e.g., 40°C/75% RH for 4 weeks).
• Supporting technical dossiers for CE marking, FDA 510(k) submissions, and China NMPA registration of medical-grade absorbent devices.

FAQ

What synthetic urine formulation is recommended for this test?
A 0.9% (w/v) sodium chloride aqueous solution, adjusted to pH 6.0 ± 0.2 with dilute phosphoric acid, is specified in both GB/T 24218.14 and ISO 9073-14.
Is the 200 g weight calibrated traceably to national standards?
Yes—the supplied stainless-steel weight is certified to ±0.1 g accuracy and includes a traceable calibration certificate issued by HAIDA’s ISO/IEC 17025-accredited metrology lab.
Can the instrument be used for testing feminine hygiene pads?
While optimized for infant diaper topsheets per standard scope, the HD-D014 may be adapted for other absorbent structures with method validation per ASTM D737 or internal SOPs.
Does the system meet GLP or GMP documentation requirements?
It supports core GLP elements—including user access control (via password-protected admin mode), electronic audit trail, and raw data retention—but requires complementary procedural controls (e.g., SOPs, training records) for full GMP compliance.
How often should the load cell be verified?
Daily verification using the built-in calibration function is recommended; full external recalibration is advised every 12 months or after impact events.