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What do Rubber Bonded Stripper Rings Mean?

“Rubber Bonded Stripper Rings” are specialized components used in various industrial machinery, particularly in converting and processing equipment for web-based materials like paper, film, foil, and textiles. These rings typically consist of a metal core (often steel or aluminum) onto which a layer of rubber or polyurethane is bonded. Their primary function is to maintain separation between slit strips of material as they are being rewound onto individual cores or reels. The rubber or polyurethane outer layer provides a high-friction surface that grips the material, preventing telescoping (uneven winding) and ensuring a tight, consistent wind. The “stripper” aspect refers to their role in positively separating the slit webs, preventing them from sticking together or interfering with the rewinding process. Rubber Bonded Stripper Rings are crucial for achieving high-quality, accurately wound rolls of material in high-speed converting operations. They are also sometimes referred to as “rubber spreader rings,” “urethane stripper rings,” “web separating rings,” “slitter stripper rings,” “rewinder stripper rings,” or “rubber friction rings,” depending on the specific application and industry.

Uses and Applications of Rubber Bonded Stripper Rings

Rubber Bonded Stripper Rings are essential components in a variety of web converting and processing machinery:

• Slitter Rewinders: Used on the rewind shafts of slitter rewinders to separate the slit webs of paper, film, foil, or textiles, ensuring each roll is wound cleanly and tightly without telescoping.
• Converting Machines: Employed in various converting equipment for materials like labels, tapes, and flexible packaging to maintain web separation during processing.
• Textile Processing: Used in machinery that slits and rewinds fabrics or non-wovens to prevent the slit strips from clinging together.
• Film and Foil Handling: Critical for handling and rewinding thin and often static-prone films and foils, ensuring smooth and even winding.
• Adhesive Tape Manufacturing: Used to separate the slit lanes of adhesive tapes as they are wound onto individual cores.
• Label Stock Converting: Ensures proper separation of multiple label webs after slitting.
• Specialty Web Handling: Used in custom machinery for handling various web materials where precise separation is required during winding or unwinding.

The specific dimensions (inner diameter, outer diameter, width), the type and hardness of the rubber or polyurethane, and the design of the Rubber Bonded Stripper Rings are chosen based on the material being processed, the slitting width, the winding speed, and the desired quality of the finished rolls.

Common Materials for Rubber Bonded Stripper Rings

Rubber Bonded Stripper Rings are typically composed of two main material types: the core and the bonded outer layer. The selection of these materials is crucial for performance and durability:

• Core Materials:

  • Steel (various grades): Provides high strength and rigidity, ensuring the ring maintains its shape under pressure.
  • Aluminum: Offers a lighter weight option, which can be beneficial in high-speed applications to reduce inertia.

• Bonded Outer Layer Materials:

  • Natural Rubber: Offers good friction and flexibility, suitable for many general web separating applications. Different hardness levels can be specified.
  • Synthetic Rubber (e.g., Nitrile, Neoprene): Provides enhanced resistance to oils, chemicals, and abrasion compared to natural rubber, suitable for more demanding environments.
  • Polyurethane: Offers excellent abrasion resistance, high load-bearing capacity, and a wide range of hardness options, making it a popular choice for high-speed and heavy-duty applications.

The bonding process between the core and the outer layer is critical to prevent delamination under the stresses of operation. This typically involves chemical bonding or vulcanization. The hardness of the rubber or polyurethane (measured in Shore A or D) is a key specification, as it determines the grip and the amount of separation force applied to the web.

Common Shapes and Features of Rubber Bonded Stripper Rings

Rubber Bonded Stripper Rings generally have a ring shape, but variations in design and features optimize their performance:

• Standard Rings (Flat Outer Surface): The most common type, with a flat, cylindrical outer surface of bonded rubber or polyurethane.
• Contoured Outer Surface: Some rings may have a slightly convex or other contoured outer surface to optimize contact with the web or to provide specific separation characteristics.
• Grooved Outer Surface: Grooves on the rubber or polyurethane surface can help to channel air or reduce surface contact area in certain applications.
• Keyways or Notches: The metal core may feature keyways or notches on the inner diameter to ensure proper alignment and prevent slippage on the rewind shaft.
• Specific Dimensions: Inner diameter, outer diameter, and width are precisely manufactured to fit the rewind shaft and accommodate the required web separation.
• Color Coding: Sometimes, stripper rings are color-coded to indicate different sizes or hardness levels for easy identification.
• Split Rings: Some designs may feature a split in the ring to facilitate easier installation and removal from the shaft.

The selection of the shape and features depends on the specific machinery, the material being processed, and the desired winding characteristics. The rings must be dimensionally accurate and have a consistent and durable bonded surface to ensure reliable performance over time.

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