EP conveyor belts, often referred to as polyester conveyor belts, consist of multiple layers of bonded polyester fabric, forming a robust carcass. These belts are characterized by low elongation, high impact resistance, a soft body, lightweight structure, excellent troughability, and remarkable elasticity. They are ideal for medium to long-distance transportation with high conveying capacity and speed. Typical applications span across various industries, including coal, mining, cement, crushing plants, seaports, metallurgy, power stations, and the chemical sector.
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Choosing the ideal conveyor belt is crucial in such intricate environments. How can one select the conveyor belt that offers the best efficiency while being economically viable?
1. Selection Based on Conveyor Line Length
When determining which EP conveyor belt to select, it is essential to analyze the interplay among conveying volume, distance, speed, and the belt's width.
The width must align with the requirements for volume, material particle size, and tension. Chart 1-1 illustrates the maximum cross-sectional area (S) achievable for various widths.
This chart represents the calculated capacity Iv (m3/s) at a belt speed (V) of 1.0 m/s with an inclination coefficient (K) of 1, allowing for precise width determination based on cross-sectional area.
For materials containing large, solid blocks or when there's a significant drop at the reception point, it is vital to consider both the covering layer's thickness and the conveyor belt's impact resistance. Opting for impact-resistant and ripstop steel cord meshed belts is recommended. Refer to Chart 1-2 for the particle sizes suitable for different EP conveyor widths.
2. Assessing the Safety Factor
It is important to establish a suitable safety factor to economically select the EP model and the number of carcass layers. Considerations include safety, reliability, lifespan, manufacturing quality, economic costs, splicing efficiency, starting factors, site conditions, and previous experiences. Typically, a vulcanized splicing safety factor for nylon and polyester (EP) belts is between 10-12. For situations demanding heightened safety, this should exceed 12, while mechanical splicing should be greater than 15.
3. Conditions for Using EP Conveyor Belts
The chosen EP conveyor belt must adapt to specific application characteristics. For unique conditions, specialized conveyor belts are necessary.
Common EP rubber conveyor belts function effectively between temperatures of -10°C to 40°C. When temperatures dip below -10°C, these belts are unsuitable. For colder environments below -20°C, cold resistance should be requested from manufacturers for steel cord belts.
Regular EP rubber belts cater to materials that do not exceed 80°C. For exposed materials ranging from 80°C to 150°C, heat-resistant EP belts should be employed, classified into types T1 to T4 based on different temperature tolerances. For materials between 300°C to 500°C, consult manufacturers for higher-grade heat-resistant options. Conveying acidic, alkaline, corrosive, oily substances necessitates rubber belts designed for such conditions, while flame-resistant belts are mandatory in fire-hazard-prone areas, like underground coal mines.
4. Coordination Between Cover Rubber and Belt Carcass
When selecting the EP conveyor belt model, the compatibility between cover rubber and the belt carcass is pivotal. Key parameters to consider include the quality of adhesive properties, which significantly impact service life. Effective adhesion between fabric layers and with the cover layer is critical for mitigating aging and heat resistance issues. Optimal adhesion strengths average 3.5 N/mm for fabric layers and 3.2 N/mm for cover layers.
Manufacturers enhance adhesion performance by utilizing high-quality rubber as the cover matrix, combining it with various chemical formulas for optimal aging properties. High-quality rubber boasts durability up to 150-degrees Celsius without concern for adhesion failure.
Choosing the right EP fabric for the conveyor belt is equally essential. EP fabric ensures better cold and heat resistance, along with superior tortuosity and tear resistance. Typically, EP fabrics are classified into tensile models such as EP100, EP150, up to EP400 for specific applications, especially for long-distance and heavy-duty transport.
As the number of EP fabric layers increases, higher counts do not always equate to better performance due to potential excessive squeezing during roller passage, which could weaken adhesion between layers. A recommended layer count stands at 3-5 for safety.
The rubber cover of an EP rubber conveyor belt should possess sufficient tensile strength, as a higher tensile strength minimizes deformation during material transport. Common strengths include 15 Mpa (DIN-Z), 18 Mpa (DIN-W), up to 25 Mpa (DIN-X), with the former two meeting most strength demands. Additionally, density plays a crucial role in determining material durability and longevity; therefore, higher density belts are generally more robust despite their higher upfront cost.
SUNGDA Cover Rubber Grade for General Purpose:
DIN Standard:
AS-RMA Standard:
Muti-layer EP Fabric Grade (Tensile Strength kg/cm, PIW):
Carcass No. of plyTensile strength
(kgf/cm)Tensile at break
(kgf/cm)PIW
The standards indicated above represent the globally recognized benchmarks in conveyor belt specifications.
For further details and inquiries, do not hesitate to contact us regarding your requirements for EP 300 fabric core belting. Our knowledgeable sales team is prepared to assist you in exploring the options that best meet your needs.
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