Overview
ISO 9073-11:2026, Nonwovens - Test methods - Part 11: Run-off, published by the International Organization for Standardization (ISO), specifies standardized methods for evaluating the run-off characteristics of nonwoven fabrics. This test method determines the amount of test liquid (simulated urine) that runs off a nonwoven sample when poured onto it while placed over an absorbent medium on an inclined plane. The standard is ideal for comparing the run-off performance of different nonwoven materials, supporting product development and quality control in industries where liquid management is critical. However, the methods are not intended to simulate in-use conditions for finished products.
Key Topics
- Run-off Measurement: The primary goal is to determine the mass or percentage of test liquid that runs off a nonwoven specimen, providing meaningful data for material comparison.
- Testing Options:
- Option A: Basic test for hydrophilic (water-absorbing) nonwovens.
- Option B: Repeated test using the same nonwoven specimen to assess consistency across multiple exposures.
- Option C: Modified test for hydrophobic (water-repellent) nonwovens, using a different incline angle to better differentiate repellency.
- Simulated Urine: The test liquid is a 9 g/l sodium chloride solution in demineralized water, with specific surface tension requirements to mimic real-world fluids.
- Sample Conditioning: Samples must be properly conditioned to ensure reliable, reproducible results.
- Sampling Procedures: Guidance is provided on selecting and preparing laboratory samples, ensuring statistical relevance and traceability.
Applications
The methods outlined in ISO 9073-11:2026 are useful in various stages of nonwoven product development and manufacturing, particularly in:
- Hygiene Products: Manufacturers of diapers, adult incontinence pads, and feminine hygiene products can assess the liquid management performance of nonwoven coverstocks.
- Medical Textiles: Enables product comparisons for surgical drapes, wound dressings, and other medical disposables where fluid control is essential.
- Quality Control: Ensures consistency of absorbency and repellency performance in nonwoven rolls or lots prior to further processing or use in end products.
- Research & Development: Option D and various parameters outlined allow R&D teams to investigate alternative testing conditions and additional material characteristics, encouraging innovation and enhanced product performance.
Related Standards
Utilizing ISO 9073-11:2026 alongside other relevant standards strengthens overall material assessment:
- ISO 9073-6: Focuses on absorption characteristics of nonwovens, complementing run-off data.
- ISO 139: Specifies standard atmospheres for textile conditioning and testing.
- NWSP 010.1: Details standard test methods for nonwoven absorption-essential for verifying absorbent materials.
- NWSP 70.3: Methods for determining liquid strike-through time using simulated urine, relevant for coverstock performance.
- NWSP 005.0: Guidelines for nonwoven sampling, ensuring representative testing.
- ISO 2859-1 / ISO 3951-1: Sampling procedures for inspection by attributes and variables, crucial for lot-based quality assurance.
- ISO 5636-1: Provides methods for determining air permeance in paper and board, which may be relevant for absorbent mediums.
In summary:
ISO 9073-11:2026 delivers standardized, repeatable methods for evaluating the run-off behavior of nonwovens, enabling objective product comparisons and supporting both quality assurance and innovative textile research. Accurate run-off measurement is essential for any application where fluid management by nonwovens is critical.