Belt fabrics

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There are two basic types of fabrics used in the production of Nitta conveyor belts: rigid and non-rigid fabric.

 

R-fabric - rigid fabric for conveyor belts

R-fabric, or rigid fabric, has a monofilament yarn running across the belt, which ensures that Nitta conveyor belts have a good lateral stability.

There are several varieties of rigid fabrics, which depend on the type of monofilament yarn. Nitta differentiates:

• (U)LR-weefsel light rigid
• HR-weefsel, rigid-low stretch

 

N-fabric - non-rigid fabric for conveyor belts

N-fabric, or non-rigid fabric, is flexible in the length and width and is used in troughed bulk transport or curved conveyors.

 

Special fabrics for conveyor belts

• RZ-fabric, this fabric is often used for belts deployed in bakeries. It is a combination of a monofilament yarn with a viscose yarn. This creates a thicker crave for heavy dough products.
• DRA-fabric, is an interwoven polyester fabric.
• XR-fabric, gives extreme lateral stability and can be used in chocolate cooling tunnels, and swanneck conveyors.

 

Other fabrics for conveyor belts

• CP-fabric, or cotton/polyester fabric, has cotton fill yarns for moisture absorption and polyester warp yarns for strength and low stretch. Cotton fabric is used for non-sticking applications for dough or uncured rubber.
• W-fabric, or whisper fabric, also called low-noise fabric. Its special structure decreases the noise a belt makes while running on conveyors. It is used in areas where people are nearby, such as airports, distribution centres or for treadmills in gyms.
• M-Fabric is a high-strength fabric used for extremely heavy-duty operations, such as marble and granite grinding or moving floors in trucks. The monofilament in the fabric assists in the flatness and tracking of the belts.
• Y-fabric, a very strong fabric for applications where a low stretch is required.

 

Antistatic fabric compositions

Some types of fabric (R, LR, DR, XR, N, W) can be combined with a carbon yarn that gives the belts antistatic qualities.

Rubber conveyor belt’s fabric layers are sandwiched between skim rubber coats for adhesion and loading support, the top and bottom rubber cover are added for protection of belt carcass, so fabric carcass played a very important role in all kind of conveyor belt, such as EP fabric conveyor belt, heat resistant conveyor belt, Nylon(NN) conveyor belt, and abrasion conveyor belt, etc.

1. There are different naming ways for dipped fabric material used by rubber conveyor belt in different countries, and the following table lists names commonly used by some countries.

 

International code

  British code

Japan/US

 Warp/weft

Material

B

      C

 

  Warp/weft

Cotton

         R

–

 

 Warp/weft

High-strength viscose

Pb

    CN

 

 Warp/weft

Brocade/cotton (twisted together)

EbPb

CT/CN

 

warp

Polyester/cotton  Labelling mode commonly used by whole core belting

Weft

Chinlon/cotton

EE

    TT

      PP

  Warp/weft

Polyester

PP

   NN

     NN

  Warp/weft

Chinlon

EP

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    TN

      PN

    Warp

Polyester

Weft

Chinlon

DP

   DN

 

     Warp

Aramid fiber

 

Weft

Chinlon

DbPb

–

 

    Warp

Aramid fiber /cotton

 

Weft

Chinlon /cotton

EPbPb

–

 

Warp

Polyester, chinlon/cotton

 

Weft

Chinlon/cotton

 

EpP

–

SW

Warp

Polyester+Chinlon  (mainly applied to straightwarp and weft)

 

Weft

Chinlon

 

St

               St

 

                          Warp

Steel wire(no weft)

Naming modes of Europe usually comply with international standards, but the Chinese naming system of dipped fabric materials has mixed different systems from Japan/US and Europe. Moreover, in the Former Soviet Union, chinlon 6 was called Kapron, so they get used to using TK to express EP fabric material which is used on EP conveyor belt and heat resistant conveyor belt.

 

2.  Types of fabric material structure commonly used by rubber conveyor belt:

Double-warp and single-weft: it’s a deformative texture of plain-weaving structure featured by 2 parallel warp yarns and one interwoven weft yarn, and in this way, interweaving points in the fabric are reduced, and this structure is applicable to the canvas with high warp and weft density. The strength utilization ratio of the canvas is improved by reducing warp and weft interweaving points. This kind of structure is called OXFORD abroad.

2/2 broken twill: this structure, also aiming at reducing interweaving points between warp and weft, is applied to heavy canvas. Compared with plain-woven fabric, the utilization ratio of its strength is higher, especially the canvas’s strength against longitudinal tearing is high, so it is applicable to the rubber conveyor belt of belt jointed mechanically. This structure is called CFW (CROW’S FOOT WEAVE) abroad.

At present, fabric materials used by rubber conveyor belt are mainly steel wire, polyester, and chinlon (mainly chinlon 66) and also extend towards composite materials, and aramid fiber has been increasingly used. Rubber conveyor belt using synthetic fibers and steel wire ropes as fabric materials in China occupy 80% of the total quantity of conveyor belts. In developed countries and regions like Europe and America, aramid fibers have been commonly used in rubber products, but China has not applied it on a large scale yet. It’s found through performance comparison that aramid fiber is the ideal fabric material for rubber conveyor belts. The future development direction of fiber fabric materials used by conveyor belts is to modify existing fiber materials, develop new-type synthetic fibers and apply all kinds of high-performance fibers.

 

For more Conveyor Belt Fabricinformation, please contact us. We will provide professional answers.