Overview
ISO/TR 7621:1982 is an ISO Technical Report that specifies the essential technical information a purchaser should supply when enquiring about or ordering rubber- or plastics-covered rollers. Published in 1982, the report helps determine the most suitable covering material, hardness and surface treatment for a roller’s intended use. It is intended as a basis for questionnaires and covers roller core construction, covering dimensions, material properties and service conditions.
Keywords: ISO TR 7621, rubber covered rollers, plastics covered rollers, roller covering specifications, roller design
Key Topics
The report organizes the purchaser’s requirements into clear information items. Major technical topics include:
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Roller application
- Machine type, function, manufacturer, roller position
- Function of roller (suction, guiding, inking, embossing, etc.)
- Product carried (paper, fabric, metal, temperature, thickness)
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Roller design and construction
- Core/shell material (steel tube, cast iron, aluminium, bronze), solid or hollow, shafts/journals
- Dimensions (face length, outside/inside diameter, overall length, journal diameter)
- Core surface condition, balancing (static/dynamic), mass, heating/cooling features
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Covering dimensions & finish
- Face length, finished diameter or thickness, crowned or parallel cross-section
- Edge finish (rounded, chamfered, tapered, dubbed) and tolerances (diameter, parallelism, concentricity)
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Material, hardness and surface of covering
- Choice between rubber or plastics; requested hardness scales (IRHD, Shore A/D, Pusey & Jones)
- Colour, surface quality and treatments (grooved, drilled, herringbone, special textures)
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Service characteristics
- Working hours, surface speed/RPM, loading (nip load, total load), contact materials
- Temperature ranges, internal heating/cooling, chemical exposure (acids, alkalis, solvents, oils)
- Cleaning methods and agents, frequency, and chemical resistance requirements
Applications and Users
ISO/TR 7621 is useful for:
- Procurement officers and purchasers specifying roller coverings in tenders and orders
- Roller manufacturers and coaters who need precise application data to select materials and processes
- Machine builders and maintenance engineers ensuring compatibility with process conditions
- Industries: paper, textiles, printing, metalworking, converting, packaging and any process using covered rollers
Practical benefits include improved material selection, longer service life, reduced downtime and clearer communication between purchaser and supplier.
Related Standards
- ISO 6123 (Parts 1–3) - Rubber or plastics covered rollers - specifications for hardness, surface characteristics and dimensional tolerances (referenced in ISO/TR 7621)
For enquiries or specifications, use ISO/TR 7621 as a checklist to capture operating conditions, core details, covering requirements and chemical/environmental constraints to ensure the most serviceable roller covering is supplied.
Open preview (PDF)Rubber or plastics covered rollers — Enquiries and orders — Recommendations for technical information to be supplied by purchaser
