Rubber Expansion Joint Manufacturer

Rubber Expansion Joint Manufacturing Process in China

Rubber Expansion Joint Manufacturing Process in China

The production of high-quality rubber expansion joints involves precise engineering and multiple quality-controlled steps. Below is our comprehensive manufacturing workflow that ensures reliable performance in various piping systems.

1. Material Preparation

  • Rubber Compound Mixing: Precisely blend natural/synthetic rubber with additives (carbon black, sulfur, accelerators) in internal mixers

  • Fabric Reinforcement Treatment: Calender cotton/nylon/polyester fabrics with thin rubber layers for reinforcement

  • Metal Component Preparation: Machine flanges/rings from carbon steel/stainless steel, then sandblast and prime surfaces

2. Building Process

  • Inner Liner Formation: Apply anti-stick solution to mandrels, then wrap uncured rubber sheets to form the inner tube

  • Reinforcement Layering: Alternate rubber and fabric layers (typically 2-6 plies) with specific overlap patterns

  • End Reinforcement: Install metal rings/flanges at joint ends using positioning tools

  • External Covering: Apply final rubber layer with UV/ozone-resistant compounds

3. Vulcanization

  • Mold Preparation: Heat steel molds to 150-160°C and coat with release agents

  • Curing Process: Place assembled joints in molds, apply 15-20kg/cm² pressure for 30-90 minutes

  • Post-Cure Inspection: Verify dimensional accuracy and surface quality after demolding

4. Finishing & Testing

  • Trimming: Remove flash rubber using rotary knives

  • Surface Treatment: Apply protective wax or coatings

  • Quality Control:

    • Pressure testing (1.5x working pressure)

    • Visual inspection for bubbles/cracks

    • Dimensional verification with templates

    • Optional X-ray for critical applications

5. Packaging

  • Wrap joints with anti-corrosion paper

  • Secure with wooden crates/plastic straps

  • Mark with product specs and handling instructions

This standardized production process ensures our rubber expansion joints meet international quality requirements for pressure resistance, flexibility, and durability. Each step undergoes strict quality checks to guarantee product reliability in demanding industrial environments.

JOINTIB has been providing cost-effective and durable rubber expansion joints and duckbill check valves . Our products are very resistant to corrosion and breakage under harsh conditions. For more information about our products, and to inquire about pricing and availability, please contact us today.  You can contact us by filling out a form on our website or writing email to sales@jointib.com

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Hi, I’m the author of this post, and I have been in this field for more than 10 years. If you want to get more info about industrial pipe rubber expansion joints, feel free to ask me any questions.

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