English
The application of rotary dehumidifiers in radial rubber tire production is particularly important. The core structure of radial tires is a composite layer of steel cord (or fiber cord) and rubber, and its manufacturing process is extremely sensitive to humidity. The rotary dehumidifier can significantly improve the adhesion performance between the curtain and rubber, reduce defects, and optimize process efficiency by accurately controlling the humidity of the production environment. The following are specific application scenarios:
1. Pre treatment of steel cord
The skeleton layer of a radial tire is composed of steel cord, and its surface needs to be coated with rubber (rubber coating) to enhance its adhesion with the rubber substrate.
Humidity impact:
Steel wire oxidation: Excessive humidity can cause corrosion on the surface of the steel wire, reducing the tensile strength of the cord.
Poor adhesion of rubber layer: Residual moisture affects the chemical bond between rubber and steel wire, leading to delamination risk.
Application of rotary dehumidifier:
Before gluing the steel wire curtain, control the humidity in the pre-treatment workshop below 30% to avoid moisture absorption and oxidation of the steel wire.
Ensure the uniformity of the adhesive coating and improve the bonding strength between the cord and rubber interface (the peel strength can be increased by 15% to 20%).
2. Curtain calendering and cutting
The coated steel cord needs to be rolled into a curtain, and then cut into specific angles and widths for tire molding.
Humidity impact:
Moisture absorption deformation of curtain fabric: High humidity causes the curtain fabric to absorb moisture and expand, resulting in a decrease in cutting size accuracy.
Rubber vulcanization delay: Moisture infiltration into the adhesive layer affects the vulcanization reaction rate, resulting in insufficient cross-linking between the ply layers.
Application of rotary dehumidifier:
Maintain the humidity in the rolling workshop below 35% to reduce size fluctuations caused by moisture absorption of the curtain fabric.
Ensure cutting accuracy (error ≤ 0.5mm) and improve tire structural consistency through a constant humidity environment.
3. Environmental control in the molding workshop
The molding of radial tires requires precise bonding of multiple layers of fabric, tread, sidewall and other components, and humidity directly affects process stability.
Humidity impact:
Decreased viscosity of semi-finished products: Excessive humidity leads to condensation of water film on the surface of uncured rubber material, reducing interlayer adhesion.
Static electricity accumulation: When the drying is insufficient, static electricity is generated by friction between the curtain and rubber, which adsorbs dust and pollutes the tire body.
Application of rotary dehumidifier:
Control the humidity in the molding workshop at 25%~40%, reduce the water film on the surface of the rubber material, and improve the interlayer bonding strength.
Suppress static electricity generation through humidity regulation (static electricity is significantly reduced when humidity is greater than 40%).
4. Optimization of vulcanization process
Radial tires require a high-temperature and high-pressure environment for vulcanization, and high humidity can interfere with the vulcanization reaction and mold performance.
Humidity impact:
Uneven vulcanization: Moisture absorption of heat causes local temperature fluctuations, affecting the crosslinking density between the cord and rubber.
Mold condensation: Condensation on the surface of the mold in a high temperature and high humidity environment, resulting in water stains or micro cracks on the surface of the tire body.
Application of rotary dehumidifier:
Control the humidity in the vulcanization workshop to 20%~35%, ensure stable vulcanization temperature, and shorten vulcanization time (about 10%~15%).
Reduce mold condensation, improve tread smoothness, and reduce defect rate.
5. Cord storage and rust prevention protection
Steel cord is extremely sensitive to humidity during storage, and corrosion can directly lead to a decrease in the strength of the tire frame.
Application of rotary dehumidifier:
Maintain the humidity in the warehouse below 40% to prevent oxidation and corrosion of steel wire curtains (the corrosion rate can be reduced to below 0.1%).
Cooperate with anti rust oil or coating technology to extend the storage period of the cord (up to 6 months or more).
