Jaw vulcanization is a highly efficient and specialized tread vulcanization and shaping process in cold retreading (pre-vulcanized tread retreading) of mining engineering vehicle tires. Its core principle is to apply uniform lateral pressure and temperature to the tire carcass with a pre-formed tread using a jaw vulcanizing machine, completing the cross-linking of the rubber layers and the shaping of the tread pattern.

Using a pre-formed tread (with complete tread pattern) that has been vulcanized at high temperature, it is bonded to the sanded old tire carcass through low-temperature vulcanization (110–120℃) and a special adhesive.

• Equipment:
  Jaw tread vulcanizing machine (hydraulic drive, jaw pressure plate, heating plate)
• Principle:
  When closed, the upper and lower jaw plates apply uniform pressure (0.8–1.2 MPa) from both sides towards the center, combined with electric/steam heating (110–120℃), ensuring thorough vulcanization and tight bonding of the buffer rubber/adhesive between the pre-made tread and the tire carcass.
• Advantages:
  Uniform pressure, precise shaping, high efficiency, suitable for large-size heavy-duty tires.

Heavy-duty engineering tires for large mining dump trucks, loaders, bulldozers, etc. (23.5R25, 29.5R25, 35/65R33, etc.) Tires with intact carcass structure and only tread wear that can be retreaded.

• Uniform pressure distribution: Avoids uneven local pressure in traditional vulcanizing tanks, reducing air bubbles and delamination.
• Authentic tread pattern: Pre-fabricated tread pattern is non-deformable and highly clear.
• High efficiency: Multi-layer mold, automatic push-pull, multiple tires can be processed in a single batch.
• Minimal carcass damage: Low temperature (110–120℃), lower than hot retreading (150–180℃), protecting carcass strength.

1. Carcass Inspection and Screening
   • Appearance + X-ray / Ultrasonic Testing: No structural damage, no broken steel wires, no delamination.
   • Wear Standard: Remaining tread ≥ 2mm
2. Carcass Pretreatment
   • Cleaning → Drying → Large Grinding / Fine grinding (exposing fresh rubber, without damaging the cords)
   • Repairing damage (≤3 places, single hole ≤35mm)
   • Applying adhesive/mortar → Drying
3. Tread bonding
   • Applying buffer rubber layer (intermediate pad rubber)
   • Centering and bonding pre-cured tread → Roller pressing for degassing and compaction
4. Jaw vulcanization (core)
   • Loading into the jaw vulcanizing machine → Closing and pressurizing (0.8–1.2 MPa)
   • Heating to 110–120℃ → Holding vulcanization for 120–180 minutes
   • Pressure holding, temperature control, degassing
5. Cooling, finishing, quality inspection
   • Natural cooling → Deburring, shoulder trimming
   • Appearance + uniformity + dynamic balance testing

• Temperature: 110–120℃ (low temperature, protecting the tire carcass)
• Pressure: 0.8–1.2 MPa (lateral uniform pressure)
• Time: 120–180 Minutes (larger specifications, longer)
• Environment: Fully vented, no bubbles

• Tire Carcass Qualified: No hidden damage
• Grinding Properly: Ra50–100μm, no contamination
• Tight Bonding: No air bubbles, accurate centering
• Precise Vulcanization: Strict control of temperature, pressure, and time
• Finished Product: No air bubbles, no delamination, clear tread pattern, bonding strength ≥8N/mm

Jaw vulcanization is the preferred process for cold retreading of mining engineering vehicle tires. With its uniform pressure, low-temperature precision, high efficiency, and stability, it allows retreaded tires to approach the performance of new tires (lifespan reaching 85%+ of new tires), while costing only 30–40% of new tires, significantly reducing mining operating costs.

Qingdao Beishun Environmental Protection Technology Co., Ltd. is engaged in Environmental protection machinery, rubber machinery R & D and manufacturing enterprises, located in the west coast of Qingdao ---- Jiaonan city, Qingdao Economic and Technological Development Zone, adjacent to the former Bay near Qingdao Port and International Airport Jiaodong airport, excellent geographical location.

The company gathered a large number of the industry's outstanding technical and management personnel, advanced machining, heat treatment equipment and sophisticated detection equipment. With high-quality service, advanced equipment and strong technical force as the basis, through constant innovation and development, Beishun Environmental Protection Technology machinery has many customers at home and abroad to establish a stable business relationship, and gradually establish a brand in the same enterprise.

Companies adhere to the "first-class quality to gain market confidence, quality service to win customer satisfaction, continuous improvement of enterprise development seek to establish a corporate brand management excellence" business philosophy, in terms of quality, brand and work hard to achieve the strategic goals of common development.

Qingdao Beishun Environmental Protection Technology Co., Ltd. will carry forward the "realistic, innovative, rigorous and efficient" business style, good governance, integrity first, with a high sense of responsibility "in customer service, service to the community", with industry colleagues mutual benefit, for a better tomorrow.