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Produits

ARABELT ®

ARABELT ®
Description du Produit

Bandes Transporteuses en Caoutchouc Textiles avec Aramide

 

ARABELT est une Bande Transporteuse en Caoutchouc caractérisée par un pli unique de fibre aramide avec une construction spéciale à fils de chaîne rectiligne. Il s’agit d’un tissu particulier dans lequel les filaments longitudinaux (chaîne) ne sont pas croisés avec les transversales (trame); en outre, le lien entre chaîne et trame est assuré par un liant spécial en nylon. De cette façon, toutes les deux chaîne et trame sont rectilignes, avec deux avantages principaux: pas d’allongement dû au tissu de fibres et la possibilité de relier grands filaments de chaîne et de trame entre eux. Le deuxième aspect assure une élevée tension de rupture et une résistance supérieure à déchirures, découpages et impacts grâce à la présence d’une double trame réalisée avec filaments de nylon extensibles.
Ce produit peut garantir caractéristiques mécaniques typiques des bandes acier, comme les petits allongements de la carcasse et grande tension de service qu’on peut atteindre avec un poids et densités d’une bande textile traditionnelle.

Properties

PHYSICAL AND CHEMICAL PROPERTIES OF INDUSTRIAL FIBRES

 

 AramidPolyesterPolyamideSteel
Density g/cm21,441,381,147,85
Melting point °C>5002602551600
Tenacity mN/tex1950820820330
Tensile strenght N/mm2280011309352550
Elongation at break %3,313202,5
Max stretching at working tension %0,51,52,50,3
Heat degradation % (after 48h, 200 °C)905545100

 

 

Bolt values show the main advantages of aramid in comparison with other fibers:


➢ Superior strength/weight ratio


➢ High working temperature


➢ Density similar to textile fibres


➢ Tensile and elongation similar to steel cord


➢ Superior flame resistance

 

 

COMPARATIVE TABLE

 

 AramidPolyesterPolyamideSteel
Tensile strength (load/section)********
Tenacity (load/weight)********
Modulus*********
Temperature resistance*******
Flammability*******
Longitudinal flexibility********
Troughability*********
Impact*********
Low belt weight********
Low belt thickness*******
Corrosion**********
Amagnetic properties**********

 

* Fair        ** Good          *** Excellent

Technical Data
Fabric styleKN/m6308001000125014001600180020002500
Belt styleKN/m6308001000125014001600180020002500
Working tensionKN/m80100125160175200225250315
Carcass weightKg/m22,32,42,93,43,53,64,14,34,7
Carcass thicknessmm1,902,102,602,903,353,353,403,453,50

 

 

DESIGN VALUES AND SAFETY FACTORS

 

 ARABELT®Steel cordEP belt
Tensile strength (%)100100100
Working tension (%)12,512,510
Peak tension (starting) (%)16,716,712,5
Safety factor in ordinary use8810
Safety factor at starting668

 

Safety factors similar to steel cord belts are acceptable thanks to the monoply straight warp construction of ARABELT®, more similar to steel cord than textile costruction.

 

 

MINIMUM RECOMMENDED PULLEY DIAMETER mm

 

Belt style
KN/m
100% - 60% of RMBT60% - 30% of RMBT
Drive pulley

Tail & Snub

pulleys

Drive pulley

Tail & Snub

pulleys

630315250250250
800500315315250
1000500400400315
1250630500500400
1400800630630500
1600800630630500
1800800630630500
20001000800800630
2500125010001000800

 

 

COMPARATIVE GRAPHICS

 

Graphics show the difference of elastic characteristics between aramid and other fibres, commonly used in conveyor belt production.
The extreme differences between aramid and standard textile fibres, natural or syntetic are evident.

The history of conveyor belts is represented by these curves starting from cotton with very poor mechanical characteristics, soon after from rayon, polyamide and polyester with always better performances. Aramid, a sintetic fibre with same origin of polyester and polyamide, shows total different characteristics, with very low elongation, high elastic modulus (curve slope) and superior specific tensile strength.

 

Two similar graphics are represented in order to explain one of the most important properties of aramid: density. In the left graphic, we observe that aramid and steel seem to have similar characteristics. In mechanical terms, this is true but for conveyor belts the weight is a fundamental parameter as it defines the power necessary to assure the movement.


So, looking the graphic on the right, we notice big differences between aramid and steel: this is due to their weight ratio (more than 5:1). This very low density of aramid assures a very high tenacity (ratio strength/weight): being equal the tensile strength, the weight of aramid resistant fabric is lower than steel cord carcass.

 

Specific Service Cover Compounds

ABRASION SERVICE


CL (L grade ISO 10247) Standardmwear resistant compound.

CL is a cover rubber recommended for all ground applications and for the majority of materials, where resistance to abrasion is required. Conveyor belts with CL compound are suitable to handle heavy and/or abrasive materials such as gravel, stone, coal, cement.


EC (D grade ISO 10247) Extra wear bresistant compound.

EC is a superior quality cover rubber, especially designed where maximum resistance to abrasion is required. The characteristics of resistance to cut, tear and ozone cracking, together with long duration, improve the quality of this cover. EC is expressly designed for steel works and iron minings; however, it is also recommended for heavy lump ore, coke, salt, limestone.

 

SC (H grade ISO 10247) Superior cutting resistant compound.

SC is a cover rubber designed for specific use when the resistance to cut and tear is the most important requirement. SC also guarantees high abrasion resistance. Main applications are quartz and cullet conveyance.


SELF EXTINGUISH


BS Autoextinguish compound.
BS is a cover rubber designed to service both underground and above ground application where safety is fundamental and fire risk is high. It is recommended in particular for coal and potash applications. as auto estinguish and antistatic compound, BS is designed according ISO 340 and ISO 284 or equivalent.

 

AG Autoextinguish and oil resistant compound.

AG is a nitrile compound suitable for conveyor belts and bucket elevator systems of cereal terminals and silos. AG cover rubber provides superior resistances to vegetable oils and animal fats; it is also autoextinguish and antistatic according to ISO 340 and ISO 284 or equivalent in order to guarantee high safety to the conveyor plant.


OIL SERVICE


OH High oil resistance compound.
OH is a premium quality cover rubber with maximum resistance to oils and characterized by low volume variations after immersion in highly aggressive mineral oils. OH is expressly realized for belts conveying materials sodden by mineral oils, as for example the mechanical manufacturing rejects.

 

OM Vegetable oil resistance compound.

OM is a cover rubber that guarantees a good belt resistance against the chemically aggressive effects due to the transport of materials with moderate oil presence, like corn, fertilizers and general vegetable oily materials.

OM is expressly designed to resist the terpene of wooden chips and to convey solid urban waste materials.


HEAT SERVICE


CX High temperature resistance.
CX is a rubber compound assuring  a medium degree of abrasion resistance; it is formulated for continuous
service at temperature of 130 °C with peacks of 150 °C


TX Superior temperature resistance.
TX is a cover rubber that assures the maximum heat resistance for a rubber compound. It is designed to resist at maximum working temperature of 200 °C with peack of 300 °C.

 

All type of conveyor belts produced by SIG SpA are realized according to ISO standard; furthermore they meet also the requirements of equivalent UNI, DIN, BS, NF, ASTM and RMA standards.

Table

Service & resistanceAbrasion resistantSelfextinguishOil resistantHeat
resistant
CLECSCBSAGOMOHCXTX
AbrasionXXXXXXXXXXXXXXXXXXXX
Cut & tearXXXXXXXXXXXXXXXXXXXXX
FireN.A.N.A.N.A.XXXXXXXXN.A.N.A.N.A.N.A.
ConductivityXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Animal & vegetable oilsN.A.N.A.N.A.N.A.XXXXXXXXXXXXN.A.N.A.
Mineral oilsN.A.N.A.N.A.N.A.XXXXXXXXXXN.A.N.A.
HeatXXXXXXXXXXXXXXXXXXXXX

 

N.A. Not applicable; X fair; XX good; XXX very good; XXXX excellent.

 

 

TEMPERATURE RESISTANCE °C

 

Service & resistanceAbrasion resistantSelfextinguishOil resistantHeat
resistant
CLECSCBSAGOMOHCXTX
High Temp. (fines)70707070807080130180
High Temp. (coarse)9090909010090100150200
Low Temperature-40-40-40-30-25-40-25-30-30

 

Transition Distance

The transition distance is the length of the section between head or tail pulley and the first troughing idler. In some cases, intermediate idlers are placed along the transition distance to favour the passage of the belt from the flat to the trough shape.

These conveyor sections are the most critical points of the whole plant as the elastic performaces of the belt during the time depend on them. If the transition distance is not correctly designed, high overtensions on the edges and abnormal compressions along the central axis of the belt are generated.

Such phenomenons are the cause of unexpected defects, sometimes attributed by mistake to the belt as wave on the edges and longitudinal fold of the belt carcass.

These considerations are extremely important for ARABELT® because of its elastic modulus, much higher than the one of other syntetic products (polyester and nylon), but quite similar to the values of steel.

In this case, the application of ARABELT® on plant designed for standard EP belts could result in a early damaging, expecially of the edges.

According to the recommendation of the international standard ISO 5293/81, the calculation of the transition distance is performed in order to prevent belt centre from buckling and edge tension from exceeding 130% of the maximum recommended belt tension (RMBT).

 

These conditions can be respected adopting the following formula:
Lt = 18,71 x V


When the belt is not used at 100% of RMBT, the transition distance can be reduced according to the following table:

 

%RMBT90%80%70%<60%
Lt multiplier factor0,930,820,740,71

 

Splicing Method

One of the advantages of ARABELT® is the easy system of splicing and repair: only ordinary equipments used for textile belts are necessary and the required time is less than the one for steel cord belts.
We recommend the finger method shown in this page to avoid any transversal and lengthwise stiffening. This is fondamental to allow the running with small pulley diameter and sets of idlers with high inclination (up to
45°) without any dangerous overstress on the splice.
The first step for the preparation of the joint is the removal of both the covers of the two ends of the belt. - Refere to the table and the drawings for the dimension of these areas. -
Then it is necessary to draw and cut the fingers that will realize the joint.

 

The belt must then be lined up and the splice elements coupled. This operation needs to fix the belt ends, turn the fingers over to put in position rubber sheet for bottom cover, bottom insertion fabric and skim rubber. All these elements must be treated with rubber solution and rolled together to obtain the best adhesion. Then fingers must be positioned in the final position, starting from the centre towards the edges. The splice is completed with the application of skim rubber, top insertion fabric and bottom cover.

The vulcanization process follows the same procedure used for standard fabric belts. As the final strength of the splice depends on the tearing resistance and adhesion of the skim rubber placed between fingers and insert fabric, we strongly recommend the use of our products.

 

Belt styleFinger lenght LPFinger width P
63080060
800100060
1000120060
1250150060
1400170070
1600200070
1800220070
2000240070
2500300070