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What Are the Types of Conveyor Belts?

Views:0     Author:Site Editor     Publish Time: 2021-10-22      Origin:Site

There are many types of conveyor belts.

PBO+Kevlar Conveyor Belts

Kevlar Conveyor Belts

Nomex Conveyor Belts

Polyester Conveyor Belts

To know about the difference, we need to learn more about those materials first. Let's start now.


PBO fiber is the variety with the highest mechanical properties and heat resistance among high-performance organic fibers! It has excellent strength, modulus, heat resistance, flame resistance, impact resistance, friction resistance and dimensional stability, and is light and soft, making it an ideal textile material.

A PBO filament with a diameter of 1 mm can lift a weight of 450 kg, with a limiting oxygen index (LOI) of 68% and a density of 1.54-1.56 g/cm3. It is a high-strength non-combustible fiber. The industrial production of PBO began in 1998 at the end of the last century. Its excellent performance attracted significant attention as soon as it appeared, and it was called "21st Century Super Fiber".

The U.S. Air Force Material Laboratory initially developed PBO in the 1970s as a high-temperature resistant material. However, it has always been limited by the synthesis process. It is impossible to synthesize large molecular weight PBO polymers, and its superior performance is also tricky. Reflected. Until the mid-1980s, a new monomer synthesis, polymerization and spinning technology was developed by DOW Chemical Company. In 1991, it began joint research and development of PBO fiber with Toyobo Co., Ltd.. In 1995, Toyobo Co., Ltd. Trial production started under the patent license of DOW Chemical Company, and commercial production started in October 1998 with the registered trademark of Zylon.

PBO Felt Belt


The strength and modulus of PBO fiber are more than 1.8 times that of Kevlar fiber, and the thermal decomposition temperature is as high as 650°C. , The heat resistance is 100℃ higher than that of para-aramid, and the limiting oxygen index (LOI) reaches 68. It is a non-combustible fiber. And its density is 1.54-1.56g/cm3, lighter than carbon fiber (carbon fiber density 1.80-1.87g/cm3). The strength is 5.8GPa (reported as 5.2GPa in Germany). The modulus is 180GPa, the highest among existing chemical fibers; it has excellent chemical resistance and only dissolves in a few acids such as concentrated sulfuric acid and polyphosphoric acid.


The main characteristics of PBO fiber are good heat resistance, high strength and modulus, so it is widely used.

(1) Filaments

Used as reinforcing materials for rubber products such as tires, belts (conveyor belts), hoses, etc.; 

Reinforcing materials for various plastics and concretes; 

Reinforcing components for ballistic missiles and composite materials; 

Fiber optic cables The protective film of the tensile parts and optical cables; 

The reinforcing fibers of various flexible wires such as heating wires and earphone cables; 

High tensile materials such as ropes and cables; 

Heat-resistant filter materials for high-temperature filtering; 

Protective equipment for missiles and bullets, bulletproof vests, Bulletproof helmets and high-performance sailing suits; 

Sports equipment such as tennis, speedboats, and rowing; high-end loudspeaker vibration plates, new communication materials; aerospace materials, etc.

(2) Chopped Fiber and Pulp

Used as reinforcing fiber for friction materials and sealing gaskets; 

Reinforcing materials for various resins and plastics, etc.

(3) Yarn

Used for firefighting clothing, furnace work clothes, welding work clothes and other heat-resistant work clothes;

Used in the treatment of molten metal; 

Cut-proof protective clothing, safety gloves and safety shoes; 

Racing suits, rider clothing; 

All kinds of sportswear and active sports equipment; 

Carrace pilot suit; 

Anti-cutting equipment, etc.

(4) Short Fiber

Mainly used for heat-resistant cushion felt for aluminum extrusion processing; 

Heat-resistant filter material for high-temperature filtration; 

Heat protection belt.


Kevlar is the brand name of an aramid fiber material product developed by DuPont in the United States. The repeating unit of the chemical formula is -[-CO-C6H4 -CONH-C6H4-NH-]-The amide group attached to the benzene ring is a para-position structure (the meta-position structure is another product under the brand name Nomex, commonly known as fireproof fiber).

Kevlar Felt Belt


It's strong but relatively light. The specific tensile strength (stretching or pulling strength) of Kevlar 29 and Kevlar 49 is over eight times greater than steel wire.

Unlike most plastics, it does not melt: it's reasonably good at withstanding temperatures and decomposes only at about 500℃(932°F).

Unlike its sister material, Nomex, Kevlar can be ignited but burning usually stops when the heat source is removed.

Low temperatures do not affect Kevlar: DuPont found "no embrittlement or degradation" down to −196°C (−320°F).

Kevlar can resist attacks from many different chemicals, though long exposure to strong acids or bases will degrade over time.

In DuPont's tests, Kevlar remained "virtually unchanged" after exposure to hot water for more than 200 days, and its super-strong properties are "virtually unaffected" by moisture.


Kevlar is probably best known for its use in bulletproof vests and knife-proof body armor, but it also has dozens of other applications.

For Example

Ballistics and defense

Composites in Aircraft structural parts

Belts and hoses for automotive heating/cooling systems

Fiber optic and electromechanical cables

Friction products and gaskets

Adhesives and sealants

Protective apparel in automobile and Aircraft

Heat resistant Kevlar gloves


Nomex is a synthetic aromatic polyester amine polymer, a technological heat-resistant insulating material invented by DuPont and commercialized in 1965.

When processed into various paper types, it can provide excellent electrical, chemical and mechanical integrity. Nomex can be made into paper or paperboard with different densities and thicknesses for use in electrical equipment. Due to its multiple balanced characteristics, NOMEX's strict protection can be seen in any country requiring electrical insulation for more than 30 years.

The most widely used types of Nomex are paper and cardboard, which can be tailored to suit the needs of different machines. What is impressive is the thinness of Nomex. Different paper types can be subdivided into different thicknesses. The thinnest is only 0.05 mm thick. Its thinness allows Nomex to be used in various narrow machine spaces. The scope is broader. Take the paper hot pot as an example. Because it is only 0.05 mm, it can be heated quickly, but it will not ignite.

Nomex has many unique features that other products cannot match. Taking its thermal stability as an example, NOMEX can operate continuously for ten years without changing an environment of up to 220 degrees Celsius. Even if it is exposed to 300 degrees Celsius for a short time, it will not shrink, become brittle, soften or melt. Because of this feature, NOMEX can extend the service life of various industrial machines, especially the service life of motors and generators, and ensure reliable operation.

Nomex Felt Belt

Prominent Features

The fiber has permanent flame retardancy and will not lose efficacy due to washing and sun exposure.

The fiber has low thermal conductivity, is not easy to ignite, and does not burst when exposed to flames.

Fiber self-extinguishing, carbonization, non-drip melting.

Abrasion resistance, tear resistance, and high chemical resistance.

Can be washed or dry cleaned at 95℃, easy to wash off oil stains.

Do you know why firefighters' clothes are not afraid of burning? Their unique equipment is made of a particular combination of materials that can resist burning, melting and burning, while maintaining sufficient flexibility to complete the work. This unique material is Nomex.


Polyester fiber, commonly known as "polyester." It is a synthetic fiber obtained by spinning Polyester formed by polycondensation of organic dibasic acid and diol, referred to as PET fiber, which belongs to a high molecular compound. Invented in 1941, it is currently an enormous variety of synthetic fibers. The most significant advantage of polyester fiber is that it has good wrinkle resistance and shape retention and has high strength and elastic recovery ability. It is durable, anti-wrinkle, non-ironing, and non-sticky.

Polyester is often used in the clothing industry. The chances are that you often buy clothing without thinking about how flame-resistant it is unless you work in a high-risk environment as a welder or firefighter. You probably own a closet full of clothes made out of Polyester, but you might not know a lot about this versatile fabric. For instance, is Polyester flammable?

Like most synthetic fabrics, Polyester is not highly flammable. Polyester is naturally flame-retardant, but it does melt when it reaches a high temperature. Poly blends like polycotton can both burn and melt, depending on the nature of the fibers and the weave of the fabric.

Polyester Felt Belt


Excellent chemical, thermal and high permeability for ease of cleaning.

Food approval: USFDA approval

Working temperature: +180°C to -75°C in dry conditions. 70°C+ in wet ★conditions (Polyester can suffer from hydrolysis in hot, humid conditions, typically in the presence of steam)

Available in widths up to 3000mm wide in various styles.

PBO+Kevlar/Kevlar/Nomex/Polyester Conveyor Belts

Because of the difference in the materials, the working temperature and applications are different.

PBO Timming Belt

PBO Timming Belt

Kevlar Timming Belt

Kevlar Timming Belt

Nomex Timming Belt

Nomex Timming Belt

Polyester Timming Belt

Polyester Timming Belt

Working Temp





Mostly Suitable for

PBO-Before fly cut(Ultra-high temp. Zone). Effectively reduce traces caused by graphite.

Kevlar-Runout table & cooling table(High temp. Zone)

Nomex-After stretching conveyor only(Middle Temp. Zone)

Polyester-storage table, saw table, loading & unloading line for anodizing and painting(Room Temp. Zone)

Where to buy PBO+Kevlar/Kevlar/Nomex/Polyester Conveyor Belts?

CALM adopts high-grade raw materials and innovative production technology to make the conveyor felt belt more durable. It is flame-resistant that can withstand high temperatures up to 600℃. Our industrial felt belt is particularly suitable for producing aluminum profiles with electrophoretic or polished surfaces.

Calm seamless felt belt is available in a variety of specifications and materials. With strict quality management, we can ensure that our products can perfectly match the manufacturing requirements of aluminum extrusion.

Calm - Top Industrial Felt Manufacturer in China


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