Rubber- or plastics-coated fabrics — Determination of blocking resistance
1Key Takeaways
This document specifies a method for the determination of the resistance of rubber- or plastics-coated fabric sheets to blocking when left in contact for specified temperature, time and pressure.
2Expert Interpretation
In-depth analysis of the method for determining the anti-adhesion properties of rubber or plastic coated fabrics in the ISO 5978:2023 standard, including test equipment requirements, sample preparation specifications, standard test conditions (70±2℃/3h) and a three-level evaluation system, which is suitable for quality control of industrial textiles.
Interpretation of the core content of the standard
The third edition of ISO 5978:2023 makes important updates to the test method for the anti-adhesion performance of rubber or plastic coated fabrics. The main technical changes include:
- Revised the definition of "adhesion" (Clause 3.1) to "unintended adhesion between sheets"
- Added filter paper strips (160±2mm) as standard devices (Chapter 4)
- Specimen size tolerance is clarified as (150±2)mm (Chapter 6)
- New standard test conditions: 3 hours at (70±2)℃ (Chapter 8)
Comparison of key test parameters
| Parameters | 1990 Edition | 2023 Edition |
|---|---|---|
| Test Temperature | Not Specified | (70±2)℃ |
| Duration | Not Specified | 3 hours |
| Pressure Control | 5kg Weight | (2.18±0.02)kPa |
Technical Requirements for Test Apparatus
The standard requires the use of a double layerGlass plate (lower plate ≥153×153mm, upper plate 155±2mm) with filter paper interlayer, air circulation oven must meet the following requirements:
- Temperature control accuracy ±2℃
- ≥6 air exchanges per hour
- Sample volume ≤10% of oven free space
Implementation recommendations
Key points for sample preparation
Sampling should be taken at a distance of ≥100mm from the edge of the coil and ≥1m from the end. The 6 (150±2)mm samples should be marked in the longitude and latitude directions. It is recommended to pre-treat for ≥24 hours in ISO 2231 standard climate B (23±2℃/50±5%RH).
Result Grading Application
According to clause 8.4, the degree of adhesion is divided into:
- No adhesion: The coating is completely separated
- Slight adhesion: There is adhesion during separation but the coating is not damaged
- Adhesion: Separation is difficult and causes the coating to fall off
Industrial Application Case
After adopting this standard, a car seat fabric manufacturer optimized the PVC coating formula to improve the test results from "slight adhesion" to "no adhesion" level, and the product's summer storage adhesion complaints decreased by 72%.