{"id":5815,"date":"2025-12-25T16:52:34","date_gmt":"2025-12-25T08:52:34","guid":{"rendered":"https:\/\/www.airbag.cc\/?p=5815"},"modified":"2025-12-25T16:52:35","modified_gmt":"2025-12-25T08:52:35","slug":"how-are-the-inner-rubber-layer-and-cord-fabric-layers-built-in-ship-launching-airbags","status":"publish","type":"post","link":"https:\/\/www.airbag.cc\/fr\/how-are-the-inner-rubber-layer-and-cord-fabric-layers-built-in-ship-launching-airbags\/","title":{"rendered":"Comment la couche interne de caoutchouc et les couches de tissu de la corde sont-elles construites dans les airbags de lancement de bateau ?"},"content":{"rendered":"\n

Ship launching airbags play a critical role in vessel launching, docking, and heavy ship movement. They support massive loads, absorb shock, and allow ships to roll smoothly into the water.<\/p>\n\n\n\n

Although they look simple from the outside, ship launching airbags are actually high-performance composite structures<\/strong>. Their reliability depends mainly on two internal elements:
the inner rubber layer (air-tight layer)<\/strong> and the cord fabric reinforcement layers (load-bearing layers).<\/strong><\/p>\n\n\n\n

Let\u2019s take a closer look at how they are built and why they matter.<\/p>\n\n\n\n

\n\n\n\n

1. Basic Structure of a Ship Launching Airbag<\/h2>\n\n\n\n

A typical ship launching airbag<\/a> consists of three main parts:<\/p>\n\n\n\n

    \n
  1. Inner rubber layer<\/strong> \u2013 keeps the air inside and maintains pressure.<\/li>\n\n\n\n
  2. Cord fabric reinforcement layers<\/strong> \u2013 carry the load and resist internal pressure.<\/li>\n\n\n\n
  3. Outer rubber layer<\/strong> \u2013 protects the airbag from abrasion, cuts, and environmental damage.<\/li>\n<\/ol>\n\n\n\n

    Each layer has a specific role:
    the inner layer seals the air, the cord layers provide strength, and the outer layer protects everything.<\/p>\n\n\n\n

    In recent years, some manufacturers have upgraded the outer rubber compound<\/strong>, significantly improving abrasion resistance \u2014 in some cases by around 100% compared to traditional rubber<\/a>. This makes a big difference when airbags are used on rough concrete slipways, sandy yards, or steel tracks.<\/p>\n\n\n\n

    At the same time, the reinforcement structure has also evolved. While standard airbags often use two-strand cord constructions<\/strong>, higher-end designs now use three-strand cords<\/strong><\/a>, which provide better fatigue resistance, higher safety margins, and improved load stability.<\/p>\n\n\n\n

    \n\n\n\n

    2. Inner Rubber Layer: What It Does and How It\u2019s Made<\/h2>\n\n\n\n

    Main functions<\/h3>\n\n\n\n
      \n
    • Keeps the air inside (airtightness)<\/li>\n\n\n\n
    • Handles repeated inflation and deflation<\/li>\n\n\n\n
    • Resists aging, cracking, and fatigue<\/li>\n<\/ul>\n\n\n\n

      Material composition<\/h3>\n\n\n\n

      The inner rubber is usually a blend of:<\/p>\n\n\n\n

        \n
      • Natural rubber (NR)<\/li>\n\n\n\n
      • Synthetic rubbers such as BR, SBR, or IIR<\/li>\n<\/ul>\n\n\n\n

        The blend is designed to balance airtightness, elasticity, and durability.<\/p>\n\n\n\n

        Thickness and process control<\/h3>\n\n\n\n

        The rubber is calendered into sheets with controlled thickness. Too thin means leakage risk; too thick reduces flexibility.<\/p>\n\n\n\n

        \n\n\n\n

        3. Cord Fabric Reinforcement Layers<\/h2>\n\n\n\n

        What they do<\/h3>\n\n\n\n

        The cord layers act as the \u201cskeleton\u201d of the airbag. They:<\/p>\n\n\n\n

          \n
        • Carry the tensile forces from internal air pressure<\/li>\n\n\n\n
        • Support the ship\u2019s weight<\/li>\n\n\n\n
        • Prevent bulging and bursting<\/li>\n<\/ul>\n\n\n\n

          Cord materials<\/h3>\n\n\n\n

          Common materials include:<\/p>\n\n\n\n

            \n
          • High-tenacity polyester<\/li>\n\n\n\n
          • Nylon<\/li>\n\n\n\n
          • Aramid (for special high-performance applications)<\/li>\n<\/ul>\n\n\n\n

            Cord structure<\/h3>\n\n\n\n

            Most standard ship launching airbags use two-strand cord structures. More advanced designs use three-strand cords<\/strong>, which offer:<\/p>\n\n\n\n

              \n
            • Higher residual strength if one strand fails<\/li>\n\n\n\n
            • Better fatigue resistance<\/li>\n\n\n\n
            • More stable stress distribution<\/li>\n<\/ul>\n\n\n\n

              Rubber\u2013cord bonding<\/h3>\n\n\n\n

              Cords are treated with bonding systems (such as RFL) so they adhere strongly to the rubber and don\u2019t delaminate.<\/p>\n\n\n\n

              \n\n\n\n

              4. How the Layers Work Together<\/h2>\n\n\n\n

              A good ship launching airbag is not just about strong materials \u2014 it\u2019s about compatibility:<\/p>\n\n\n\n

                \n
              • Matching elasticity between rubber and cords<\/li>\n\n\n\n
              • Matching elongation behavior under load<\/li>\n\n\n\n
              • Matching aging and thermal behavior over time<\/li>\n<\/ul>\n\n\n\n

                Poor matching leads to internal shear, delamination, and early failure.<\/p>\n\n\n\n

                \n\n\n\n

                5. Structural Differences Between Standard and High-Quality Ship Launching Airbags<\/h2>\n\n\n\n
                Feature<\/th>Standard Airbags<\/th>High-Quality Airbags<\/th><\/tr><\/thead>
                Inner rubber<\/td>Basic airtight compound<\/td>Optimized low-permeation rubber<\/td><\/tr>
                Cord structure<\/td>Two-strand cords<\/td>Three-strand or high-tenacity cords<\/td><\/tr>
                Outer rubber<\/td>Standard abrasion resistance<\/td>Enhanced abrasion resistance<\/td><\/tr>
                Manufacturing<\/td>Basic molding<\/td>Automated, tightly controlled curing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
                \n\n\n\n

                6. How to Judge Quality from a Structural View<\/h2>\n\n\n\n
                  \n
                • Check cord material, cord count, and structure<\/li>\n\n\n\n
                • Ask about abrasion resistance of the outer rubber<\/li>\n\n\n\n
                • Look for pressure, fatigue, and burst test data<\/li>\n<\/ul>\n\n\n\n

                  Most suppliers follow ISO 14409<\/strong> as a reference. Some manufacturers design and test their ship launching airbags well above this standard and treat it as a baseline rather than a limit \u2014 which is why their products become benchmarks in the industry.<\/p>\n\n\n\n

                  \n\n\n\n

                  7. Conclusion<\/h2>\n\n\n\n

                  Ship launching airbags are not simple rubber products \u2014 they are engineered composite systems.<\/p>\n\n\n\n

                  The inner rubber controls airtightness and lifespan.
                  The cord layers control strength and safety.
                  The outer rubber controls durability in real-world working conditions.<\/p>\n\n\n\n

                  Understanding what\u2019s inside the airbag is the key to choosing a safer, longer-lasting, and more cost-effective solution.<\/p>\n\n\n\n

                  \n\n\n\n

                  FAQ<\/h2>\n\n\n\n

                  Q1: What is the inner rubber layer made of?<\/strong>
                  It\u2019s usually a blend of natural rubber and synthetic rubbers designed for airtightness, elasticity, and aging resistance.<\/p>\n\n\n\n

                  Q2: Why are cord layers so important?<\/strong>
                  They carry the load, resist internal pressure, and prevent deformation or bursting of the airbag.<\/p>\n\n\n\n

                  Q3: Is a three-strand cord better than a two-strand cord?<\/strong>
                  Yes. A three-strand structure provides higher safety margins, better fatigue resistance, and more stable load distribution.<\/p>\n\n\n\n

                  Q4: What does ISO 14409 cover?<\/strong>
                  It specifies performance and testing requirements for ship launching airbags used in vessel launching and handling.<\/p>\n\n\n\n

                  Q5: Does higher abrasion resistance really matter?<\/strong>
                  Yes. It significantly extends service life, especially on rough or abrasive working surfaces.<\/p>\n\n\n\n