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" refers to the model or size class of the extruder at the heart of the line, which has a screw diameter of 90mm. This size is ideal for producing medium to large automotive and architectural seals.

The primary output is a flexible, dense, or 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.

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

• Rubber Extruder (90mm):
  • Function: The core of the line that takes mixed, uncured rubber compound 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
• Pre-Heating / Microwave Oven:
  • Function: Rapidly and uniformly raises temperature of extruded rubber profile
  • Purpose: Initiates vulcanization process quickly to prevent sagging or deformation
• Hot Air Curing Oven:
  • Function: Long, temperature-controlled tunnel oven that completes vulcanization
  • Process: Profile travels through multiple heated zones on Teflon-coated conveyor belt
• Cooling Tunnel:
  • Function: Gradually lowers temperature of cured sealing strip
  • Purpose: Stabilizes product dimensions and ensures precise shape retention
• Traction Unit:
  • Function: Synchronized wheels that gently pull sealing strip through production line
  • Purpose: Maintains consistent profile shape and prevents stretching or buckling
• Cutting & Stacking Unit:
  • Cutting: Automatic flying cutter or saw for pre-set lengths
  • Stacking: Collects and stacks finished pieces for packaging
• Control Cabinet & HMI:
  • Function: PLC and touch-screen interface for parameter setting and monitoring

The continuous production process follows these steps:

1. Feeding: Uncured rubber compound is fed into the extruder hopper
2. Extrusion: Extruder plasticizes rubber and forms continuous profile through die
3. Pre-Vulcanization: Profile enters microwave oven for internal heating
4. Main Vulcanization: Profile travels through hot air curing oven (160°C - 220°C)
5. Cooling: Hot profile enters cooling tunnel to reach ambient temperature
6. Pulling & Cutting: Traction unit pulls strip while cutting unit slices to length
7. Collection: Finished strips are automatically stacked for packaging

• High Output: Several hundred meters of sealing strip per hour
• Stability & Precision: Tight tolerances on profile dimensions
• Flexibility: Can manufacture various seal profiles by changing extrusion die
• Automation: Highly automated from extrusion to cutting
• Energy Efficiency: Energy-efficient motors and optimized heating systems

• Automotive Industry: Door seals, window seals, trunk seals, sunroof seals
• Construction & Architecture: Door and window seals, curtain wall gaskets
• Appliances: Refrigerator doors, oven doors, washing machine lids
• Transportation: Railway carriages, buses, shipping containers

The 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 offers an optimal balance between output capacity and versatility, making it ideal for automotive and architectural applications.