What is a 90-Type Sealing Strip Production Line?

A 90-type Sealing Strip Production Line is a specialized industrial system designed for the continuous, high-volume manufacturing of rubber or EPDM sealing strips. The "90-type" typically refers to the model or size class of the extruder at the heart of the line, which in this case has a screw diameter of 90mm. This size is very common for producing medium to large automotive and architectural seals.

The primary output is a flexible, dense, or sponge (foam) rubber seal that is cured (vulcanized) and ready for use in sealing doors, windows, trunks, and other gaps against noise, water, dust, and wind.

Key Components of the Production Line

A typical 90-type line is a sequential arrangement of the following machines:

1. Rubber Extruder (90mm):

   • Function: The core of the line. It takes a mixed, uncured rubber compound (usually in strip form) and forces it through a custom-shaped die.

   • Process: The screw rotates within a heated barrel, plasticizing the rubber and building pressure to push it through the die, creating a continuous profile with the desired cross-section (the shape of the seal).

2. Pre-Heating / Microwave Oven:

   • Function: To rapidly and uniformly raise the temperature of the extruded rubber profile from the inside out.

   • Purpose: This initiates the vulcanization process quickly, preventing the profile from sagging or deforming before it enters the main curing oven.

3. Hot Air Curing Oven (Continuous Vulcanization Tunnel):

   • Function: This is a long, temperature-controlled tunnel oven that completes the vulcanization process.

   • Process: The profile travels through multiple heated zones on a Teflon-coated conveyor belt. The precise temperature control ensures the rubber cures completely, achieving its final elastic properties, heat resistance, and durability.

4. Cooling Tunnel:

   • Function: To gradually lower the temperature of the cured sealing strip after it exits the hot air oven.

   • Purpose: Rapid cooling can cause internal stress or deformation. Controlled cooling stabilizes the product's dimensions and ensures it retains its precise shape.

5. Traction Unit:

   • Function: A set of synchronized wheels that gently pull the sealing strip through the entire production line.

   • Purpose: It provides a constant, stable pulling force, which is crucial for maintaining a consistent profile shape and preventing stretching or buckling.

6. Cutting & Stacking Unit:

   • Cutting: An automatic flying cutter or saw that cuts the continuous strip into pre-set lengths without stopping the production line.

   • Stacking: Automatically collects and stacks the finished pieces for packaging.

7. Control Cabinet & HMI:

   • Function: The brain of the operation. A PLC (Programmable Logic Controller) and touch-screen HMI (Human-Machine Interface) allow operators to set and monitor all parameters, including temperatures, line speed, and cutting length.

Working Principle / Process Flow

The production process is continuous and can be summarized in these steps:

1. Feeding: The uncured rubber compound is fed into the hopper of the 90mm extruder.

2. Extrusion: The extruder plasticizes the rubber and forces it through a precision die, forming the continuous, uncured sealing strip profile.

3. Pre-Vulcanization: The profile immediately enters the microwave oven, where internal heating begins the cross-linking process.

4. Main Vulcanization: The profile travels through the hot air curing oven, where it is fully vulcanized at controlled temperatures (typically between 160°C - 220°C).

5. Cooling: The hot, cured profile enters the cooling tunnel, where it is cooled by air or water mist to ambient temperature.

6. Pulling & Cutting: The traction unit pulls the strip, and the cutting unit slices it to the required lengths.

7. Collection: The finished sealing strips are automatically stacked and prepared for packaging and shipment.

Key Features and Technical Specifications

• High Output: A 90-type line is capable of producing several hundred meters of sealing strip per hour, depending on the profile's size and complexity.

• Stability & Precision: Designed for consistent production with tight tolerances on the profile dimensions.

• Flexibility: By simply changing the extrusion die, the same production line can manufacture a wide variety of different seal profiles.

• Automation: Highly automated from extrusion to cutting, requiring minimal manual intervention.

• Energy Efficiency: Modern lines often use energy-efficient motors and optimized heating systems.

Typical Technical Parameters for a 90-type Line:

• Extruder Screw Diameter: 90 mm

• L/D Ratio: 14:1 to 16:1 (for good mixing and stability)

• Main Motor Power: ~55-75 kW

• Line Speed: Adjustable, typically 5-25 meters/minute.

• Curing Oven Length: Can be 15 to 25 meters or more, depending on the required curing time.

Applications of the Finished Sealing Strip

The sealing strips produced are primarily used in:

• Automotive Industry: Door seals, window seals, trunk seals, sunroof seals, windshield and rear glass seals.

• Construction & Architecture: Seals for doors and windows, curtain wall gaskets, and expansion joints.

• Appliances: Seals for refrigerator doors, oven doors, and washing machine lids.

• Transportation: Seals for railway carriages, buses, and shipping containers.

Conclusion

In summary, a 90-type Sealing Strip Production Line is a robust, efficient, and versatile turnkey system for manufacturing high-quality, cured rubber sealing profiles. Its 90mm extruder strikes a balance between output capacity and versatility, making it a workhorse in the rubber sealing industry, particularly for automotive and architectural applications.

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.