Overview
SIST EN ISO 22777:2005 specifies standardized test methods to determine the peel strength of touch and close fasteners used in footwear accessories. This European Standard, developed by CEN in collaboration with ISO, provides a consistent and reliable procedure to evaluate the force required to separate hook-and-loop fasteners both before and after repeated opening and closing cycles. The standard ensures quality control and durability assessments of fastening components, helping manufacturers maintain product performance and safety in the footwear industry.
Key Topics
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Peel Strength Measurement
The core of SIST EN ISO 22777:2005 is the quantification of peel strength-defined as the average force per unit width needed to separate the hook and loop tapes along their joined length. This is measured under controlled conditions using a calibrated tensile testing machine, following precise specimen preparation and testing protocols.
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Repeated Usage Testing
Fasteners undergo a repetitive opening and closing process using a cycling machine that simulates typical wear conditions. After subjecting the fasteners to 5,000 revolutions, the peel strength is re-tested to assess durability and retention of fastening efficacy.
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Standardized Apparatus and Procedures
The standard specifies the use of equipment such as:
- A tensile testing machine compliant with EN ISO 7500-1 for accurate force measurement.
- A roller device for consistent fastening pressure.
- A cycling machine with dual drums to perform repeated fastener engagement cycles under a specified force and speed.
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Specimen Preparation and Conditioning
Uniform specimen sizes and conditioning in standard atmospheres (EN 12222) ensure reproducibility and reliability of test results. Detailed markings on test specimens help maintain consistent orientation during peel tests.
Applications
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Footwear Manufacturing
Manufacturers use SIST EN ISO 22777:2005 to validate touch and close fastening components such as hook-and-loop tapes integrated into shoes, boots, and related accessories. Ensuring consistent peel strength contributes to product reliability and customer satisfaction.
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Quality Control and R&D
The test method supports routine quality inspections and helps research and development teams evaluate new fastener materials or designs in terms of performance before market release.
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Compliance and Standardization
Conformance with this international and European standard aids companies in meeting regulatory requirements and facilitates trade within CEN member countries, including the UK, Germany, France, and others.
Related Standards
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EN ISO 7500-1:
Specifies verification and calibration requirements for tensile testing machines, crucial for accurate force measurements in peel strength testing.
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EN 12222:
Defines standard atmospheres for conditioning and testing footwear and components, ensuring environmental consistency during tests.
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EN 12240:
Outlines determination methods for the overall and effective widths of fastening tapes critical for calculating peel strength per unit width.
Practical Value
Implementing SIST EN ISO 22777:2005 provides footwear manufacturers and accessory developers with a rigorous methodology for assessing the mechanical integrity and longevity of touch and close fasteners. By measuring peel strength before and after simulated wear, stakeholders can:
- Predict fastener performance under real-life conditions.
- Identify manufacturing or material defects early.
- Optimize fastener design for enhanced durability.
- Ensure product consistency across batches and suppliers.
This contributes directly to improved product quality, reduced returns, and enhanced consumer confidence in footwear products employing hook-and-loop fastening systems.
Keywords: SIST EN ISO 22777:2005, peel strength, touch and close fasteners, footwear accessories, test methods, repetitive use testing, tensile testing machine, hook-and-loop fasteners, fastening durability, footwear quality standards, CEN, ISO compliance