EN ISO 583 Textile-Carved Conveyor Belts - Total Belt Thickness and Component Thickness - Test Methods

The EN ISO 583 Textile-framed conveyor belts - Total belt thickness and thickness of component elements - Test methods standard, originally a European standard and later published by the International Organization for Standardization (ISO), describes test methods for determining the total belt thickness and the thickness of structural elements of conveyor belts with textile frames. Structural elements include covers, the frame, and interlayers, i.e., the material between adjacent layers. This standard does not apply to lightweight conveyor belts as described in the ISO 21183-1 standard.

Conveyor belts are essential components in industries such as mining, manufacturing, agriculture, and logistics, facilitating the efficient transport of materials over short or long distances. Among the various types of conveyor belts, those with textile carcasses stand out for their flexibility, lightweight designs, and cost-effectiveness. The carcass, the belt's basic structural layer, typically consists of multiple layers of synthetic fabrics such as polyester, nylon, or cotton, often impregnated with rubber or other polymers for durability.

International standards such as EN ISO 583 play a critical role in ensuring quality, performance, and safety. This standard focuses on thickness measurement, which is vital for evaluating uniformity, load-bearing capacity, and compliance with operational requirements in these conveyor belts.

The structure of a conveyor belt typically includes the following:

• Top and bottom covers: Protective rubber layers that protect the belt from wear, tear, and environmental factors.
• Carcass: A reinforcing core that provides tensile strength and flexibility. In textile carcass tapes, it is made from woven or layered fabrics instead of steel cords (used in heavy-duty steel cord tapes).
• Interlayers: Adhesives or thin layers between layers to improve bonding.

Textile carcass belts are ideal for medium-load applications such as conveying bulk materials like grain, sand, or packaged goods. They offer advantages such as easier splicing, lower weight, and reduced energy consumption during operation. However, precise thickness control is essential to prevent problems such as uneven wear, delamination, or deformation under tension.

EN ISO 583 is an international standard specifically designed for textile-framed conveyor belts. Its primary purpose is to define the following measurement methods:

• Total band thickness: The total dimension from the top cover to the bottom cover.
• Thickness of component elements: Including individual covers, carcass, and interlayers (material between adjacent layers).

This ensures the belts meet tolerances that affect performance, such as elasticity and impact resistance. This standard explicitly excludes lightweight conveyor belts used in less demanding environments, such as small-scale sorting systems, as defined in the ISO 21183-1 standard.

The EN ISO 583 standard has undergone several revisions to incorporate advances in materials and testing technology. For example, one revision focused on overall thickness and coating thickness tolerances using direct measurement methods, defining the maximum allowable differences between measurements at any two points on the conveyor belt and the allowable deviations for coatings. Another revision combined previous versions, highlighting four specific measurement techniques. The most recent revision increased accuracy in interlayer measurements and adapted to modern multilayer structures. These updates reflect the industry's shift towards sustainable materials (e.g., recyclable synthetics) and stricter quality controls, coupled with increasing automation in conveyor systems.

The EN ISO 583 standard includes four basic thickness measurement methods, each suitable for different belt constructions and test scenarios. Measurements are typically performed using calibrated instruments such as micrometers or dial gauges, and the belt is conditioned at specific temperature and humidity levels for accuracy.

• Method A - Total thickness (direct measurement): Uses a presser foot or anvil to gently compress the belt and measure from outside to outside surface. Application: All textile carcass belts, quick quality control. Key considerations: Provides even pressure to prevent fabric pinching, tolerances are typically plus/minus 0,5 mm.
• Method B - Coating thickness: This involves carefully peeling off the cover or isolating and measuring the top/bottom layers using non-destructive probes. Application: Belts where covers can be removed without damaging the housing. Important considerations: Ideal for wear-resistant coatings; deviations should not exceed plus/minus 10 percent of the nominal thickness.
• Method C - Frame thickness: Separate the frames from the caps (if possible) and measure the layer stack height, taking into account the impregnation layers. Application: Multi-layered arches; assess the tensile strength potential. Important considerations: Swelling due to adhesives is taken into account, the maximum difference between layers is plus/minus 0,2 mm.
• Method D - Interlayer thickness: Targets stripping or bonding layers between layers using cross-sectional microscopy or post-stripping calipers. Application: Complex structures with multiple interlayers. Important considerations: Critical in preventing delamination; not applicable to single-layer tapes.

These methods are performed at multiple points along the bandwidth (e.g., 5-10 measurements per meter) to verify uniformity. Since thickness variations affect tape tracking and service life, discrepancies can lead to rejection in quality assurance.

Compliance with the EN ISO 583 standard ensures that conveyor belts can withstand operational stresses such as tension, stretching (over millions of cycles), and environmental exposure (e.g., UV, chemicals). In practice,

• Production: Manufacturers use these tests to calibrate calendering processes, in which rubber sheets are layered onto fabric.
• Installation and maintenance: End users check the thickness to estimate wear rates; for example, a conveyor belt with a total thickness of 10 mm could last 5-7 years in a quarry.
• Safety and efficiency: Uniform thickness reduces energy loss (thinner tapes require less power) and minimizes downtime due to failures.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its customers, providing the advanced testing services they require, and assisting in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services to businesses in accordance with the "EN ISO 583 Textile-framed conveyor belts - Total belt thickness and component thickness - Test methods" standard.