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ISO 28239:2008 — Opener and Cleaner for Staple Fibres Preparation — Vocabulary and Construction Principles
Textile machinery — Opener and cleaner for staple fibres preparation — Vocabulary and principles of construction
Introduction to ISO 28239:2008
ISO 28239:2008 establishes a standardized vocabulary and construction principles for openers and cleaners used in the textile industry for staple fibre preparation (cotton and other staple fibres). Developed by ISO/TC 72 (Textile machinery and accessories), SC 1 (Spinning preparatory, spinning, twisting and winding machinery and accessories), this standard defines machine sides, dimensions, and all major components. It covers both openers (machines with a single horizontal opening roll) and cleaners (machines with multiple opening rolls for combined opening and cleaning).
For textile machinery engineers, ISO 28239 provides the essential terminology framework for specifying, procuring, and maintaining opening and cleaning lines. Consistent terminology is critical when coordinating between mill engineers, machinery suppliers, and maintenance teams across different countries.
Machine Components and Working Principles
The standard defines key machine components with precise terminology. The feed lattice (feed belt) delivers fibre material to the feed roll, which clamps and feeds fibres to opening roll 1 — a pinned roll that disengages tuft material. Opening rolls 2 and 3 are opening and transfer rolls equipped with metallic card clothing for progressive fibre individualization. The mote knife extracts heavy impurities (seeds, stems, sand), while carding elements pre-open fibre tufts. A swivelling deflector blade adjusts waste quantity, and suction systems (material suction and waste suction) handle fibre transport and waste removal continuously.
| Component | Function | Construction Feature | Typical Operating Parameter |
|---|---|---|---|
| Feed lattice | Delivers fibre material to feed roll | Slatted belt or roller system | Speed: 0.5-5 m/min |
| Pre-condensing roll | Condenses fibres for feed process | Perforated drum with suction | Dia. 200-400 mm |
| Feed roll | Clamps and feeds fibres to opening roll | Fluted or grooved surface | Nip pressure: 200-500 N/m |
| Opening roll 1 | Disengages tufts by pinned action | Pin density: 10-30 pins/cm2 | Speed: 600-1500 rpm |
| Opening roll 2/3 | Further opening and transfer | Saw-tooth wire clothing | Speed: 800-2000 rpm |
| Mote knife | Extracts heavy impurities | Adjustable edge distance | Gap: 0.5-3 mm to roll |
| Carding element | Pre-opens fibre tufts | Fixed or rotating flats | Setting: 0.2-0.5 mm |
Construction Variations and Configurations
Annex A (normative) defines the principles of construction with extensive variations. Working width is the primary dimension parameter. Openers are classified as: single-roll opener (one opening roll), multi-roll opener (several opening rolls in series), and universal opener (adjustable configuration for different fibre types). Cleaners are classified as: single-roll cleaner, multi-roll cleaner, pre-cleaner (for initial cleaning before the main opening line), and waste cleaner (for recovering usable fibres from waste material). Each configuration has specific roll arrangements, clothing specifications, and airflow designs optimized for different throughput rates and cleaning intensity requirements.
The choice between opener and cleaner configurations directly impacts both fibre quality and production economics. Excessive opening intensity can cause fibre breakage and nep formation, reducing yarn quality and increasing waste. Insufficient opening and cleaning leads to poor yarn evenness and higher downstream processing costs. The standard provides the framework for matching machine configuration to fibre characteristics.
Engineering Design Insights
When designing or selecting opening and cleaning machinery, key parameters include: working width (typically 600-1600 mm), roll speed combinations, clothing type (pin density and wire profile), mote knife setting, and airflow management in suction systems. The relationship between opening roll speed and fibre damage is particularly important — higher speeds improve cleaning but increase fibre breakage, especially for delicate fibres like fine cottons or synthetic staples. Modern lines often incorporate variable-speed drives for adaptive processing. Proper waste suction design must balance sufficient airflow for waste removal with minimal loss of usable fibres.
The most effective opening and cleaning line design uses a progressive approach: start with gentle opening (low-speed pinned rolls) for tuft breakup, then gradually increase opening intensity through successive saw-tooth wire rolls, with mote knives and carding elements positioned to remove impurities at each stage. This minimizes fibre damage while achieving maximum cleaning efficiency.
Q1: What is the difference between an opener and a cleaner under ISO 28239?
A: An opener has one horizontally positioned opening roll (opening roll 1 with pins). A cleaner has two or three opening rolls (opening roll 1 with pins, opening rolls 2 and 3 with metallic card clothing) for combined opening and cleaning.
A: An opener has one horizontally positioned opening roll (opening roll 1 with pins). A cleaner has two or three opening rolls (opening roll 1 with pins, opening rolls 2 and 3 with metallic card clothing) for combined opening and cleaning.
Q2: How is the right side of a machine defined?
A: The right side (R) is the side located to the right as seen facing toward the direction of fibre flow. The left side (L) is the opposite, following ISO 92.
A: The right side (R) is the side located to the right as seen facing toward the direction of fibre flow. The left side (L) is the opposite, following ISO 92.
Q3: What is the function of the deflector blade?
A: The deflector blade is a swivelling guide element that adjusts the quantity of waste extracted. By changing its position relative to the opening roll, it controls how much material is directed to the waste suction.
A: The deflector blade is a swivelling guide element that adjusts the quantity of waste extracted. By changing its position relative to the opening roll, it controls how much material is directed to the waste suction.
Q4: What is a waste cleaner used for?
A: A waste cleaner recovers usable fibres from waste material extracted during the main cleaning process, improving overall material utilization and reducing raw material costs.
A: A waste cleaner recovers usable fibres from waste material extracted during the main cleaning process, improving overall material utilization and reducing raw material costs.
