The 5 most important questions to ask when buying ...

Here are the 5 most important points to ask about:

1. How strong is the bond?

One of the most important factors to check when choosing a conveyor belt is its strength. To choose the right strength of tape, you need to know the load the tape will be subjected to. How many tons per hour (t/h), lifting height, length of conveyor, engine power and angle of inclination. Whether it&#;s a soft or abrupt start also matters. For particularly heavy loads, belt manufacturers can help with calculations.

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You can quickly check how strong a conveyor belt is by looking at the product designation itself.

Example:

A tape could be labeled &#;EP400/3 &#; 4+2&#;, where letters and numbers describe different elements. Here&#;s a brief explanation:

• The first numbers in the product designation, in this case &#;400&#;, describe strength in terms of newtons per millimeter (n/mm)
• The number just behind the slash, the &#;3&#; number stands for the number of layers
• The numbers &#;4+2&#; describe how much rubber there is on each side. top layer (&#;4&#;), and how much rubber is on the underside of the tape (&#;2&#;).
• The letters stand for the type of fabric/material in the belt. In this case &#;EP&#;, which is the most common in standard belts, is made of polyester-polyamide.

There are countless combinations of qualities, for example: 250/2, 315/3, 500/3, 630/4, /4, /5 etc. The number combinations give an overall indication of strength.

There are many different grades of conveyor belt, check how strong a conveyor belt is by looking at the product designation itself.

The actual strength can be documented in the test certificate for each roll, which states how much force is required before the tape breaks. You may want to take a look at this to check the actual strength of the tape.

2. How much wear and tear can it withstand?

Another very important quality indicator that you may want to check is how much wear and tear the conveyor belt can withstand. It is often referred to as &#;abrasion&#; in the test specification, and describes how many cubic millimeters (mm3) are worn off in a fixed test cycle. (PS! This is tested in practice by using a machine in which they put a sample piece and sand it with certified abrasive media). Here, the quality indication is the opposite of wear resistance (n/mm). So a lower number and number of cubic millimeters worn off means a more wear-resistant belt.

It&#;s a good idea to check how much wear and tear the conveyor belt can withstand. Here is an example from where worn support rollers under a conveyor belt are being replaced by an industrial fitter.

For example, the standard DIN norm for a Y-quality tape is 150 mm3. This means that the belts should have an &#;abrasion&#; or wear that is lower than this level. Note that there is a very large distance from the maximum &#;abrasion&#; in Y-quality, which is 150 mm3, down to the best belts within Y-standard, which are often between 110 and 120 mm3.

3. Does it fit the drum?

The diameter of the drive and turning drum must be considered before choosing a conveyor belt. With small diameter drums, you should not choose a conveyor belt that has too many layers of cloths. A thick conveyor belt with many layers should not be bent too hard. Then the different layers of rubber can be separated from each other. This happens if you have too small a drum diameter.

The diameter of both the drive drum and the turning drum is crucial for the belt quality in terms of strength.

Example:
If you need to haul a lot of mass on a steep uphill slope, you need a strong conveyor belt. Such a tape will have several layers of fabric, perhaps up to 4 layers of rubber. Then it has great thickness. If you then have a small drum, the four layers start to separate and the strength disappears.

4. Do I need a special tape?

We have examples of trials with special tapes and specially adapted constructions of tapes that have multiplied their lifespan. In situations where the load is high, there are alternatives with extra good rubber that should be used.

In special cases, it often needs to be tested and calculated in order to order correctly. Most suppliers can help you with that.

If you have a belt that is directly under a large crusher, where there is a fall of heavy stones or you have a conveyor of several hundred meters, you may want to consider an alternative and choose a belt with stronger rubber, multiple layers and thick cores.

Read more:
Avoid conveyor belt misalignment in 10 simple steps

In such cases, you can check the &#;tensile strenght&#; of the tape in the inspection certificate. This will give you a good indication of what the tape can withstand in terms of shocks and heavy loads.

5. What are the manufacturer&#;s quality requirements for the tape?

Conveyor belts with quality rubber from European manufacturers have significantly stricter quality requirements than the standard DIN norm. Well-known brands have modern factories and established production routines. This ensures that the quality is consistent every time a conveyor belt rolls out of the factory. In addition, they test the wear factor and strength of their conveyor belts. Some also provide a test certificate to guarantee that what you get is of the quality they promise.

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When ordering, you may often only specify the desired quality, width and thickness of the tape.

You may want to provide additional details about, among other things:

• quantity (tons per hour)
• what kind of mass to be transported
• the specific usage situation

If you ask the questions and check the various points above when buying conveyor belts, you will be in a better position to buy the right belt for your application. When it comes to purchasing conveyor belts, it may not be the purchase price that matters most. The most important thing is that you make a thorough assessment of your characteristics and needs. Choosing the right tape for your needs will have a positive impact on production and you will achieve the best possible durability per ton produced in the long term.

The conveying method of the rubber conveyor belt depends on the conveying capacity of the conveyor belt and will be restricted by terrain and environmental protection conditions. It is the prerequisite for determining the carcass material, structure, safety factor, and conveyor belt length for heavy-duty rubber conveyor belts. The rubber conveyor belt has the characteristics of heat-resistant belt, wear-resistant belt, fire-resistant belt, oil-resistant belt, alkali-resistant belt, acid-resistant belt, heat-resistant belt, and cold-resistant belt. It is mainly used for the transportation of solid materials in various mining, metallurgy, steel, coal, hydropower, building materials, chemical, food, and other enterprises.

Selection of carcass material and structure of rubber conveyor belt:

The performance of the conveyor belt is closely related to the material, structure, and number of layers of the belt core. The multi-layer cotton canvas belt has low strength, many layers, is not fatigue resistant, easy to mold, heavy-weight, and high energy consumption;

Nylon belts have high strength, great elasticity, lightweight, good impact resistance and bending resistance, good trough forming performance, mildew resistance, water resistance, and other properties that are better than cotton canvas conveyor belts. The disadvantage is that the elongation is large. When the tensioning stroke can be set to be longer, the nylon rubber belt can be preferred;

The strength of the polyester belt is similar to that of nylon. It has all the advantages of a nylon conveyor belt. Its elastic modulus is higher than nylon, its elongation is small, and its dimension is stable. It is an ideal transportation belt commonly used in industry.

The steel cord conveyor belt has high strength, good trough ability, small elongation, and short tensioning stroke. It is especially suitable for the transportation requirements of large transportation volume, high belt speed, and long-distance.

From the structural point of view, the rubber conveyor belt is mainly composed of three parts: carcass material, cover layer, and skim rubber material. The covering layer is a key part that determines its performance and use. According to the different materials used in the cover layer, the conveyor belt industry can be divided into two categories: heavy conveyor belts and light conveyor belts. The former uses rubber (including natural rubber and synthetic rubber) as the main raw material, so it is also called rubber conveyor belts. The scope is concentrated in the fields of heavy industry and infrastructure construction; the latter mainly uses polymer materials, which are mainly used in light industries such as food and electronics.

Cover rubber selection:

The choice of cover layer includes covering material, surface morphology, and thickness. The main components of the covering layer are various rubbers and plastics. Since the properties of various rubbers vary greatly, such as natural rubber and styrene-butadiene rubber have good abrasion resistance, ethylene-propylene rubber is particularly heat-resistant, but cyanide rubber has good oil resistance, and propylene butyl rubber is both heat-resistant and oxidation-resistant. Therefore, the choice of the type of covering material must be comprehensively considered according to the types of commonly used conveying materials, operating conditions, and working environment.

Besides, the increase in the thickness of the covering layer is also conducive to improving the impact resistance and abrasion resistance of the rubber conveyor belt. Especially nowadays, the cotton canvas belt core has been replaced by a synthetic fiber fabric belt core. The performance of the belt core has been greatly improved, while the thickness is relatively reduced. To improve the overall performance of the belt, it is necessary to increase the thickness of the covering layer to give full play to its advantages and increase the service life of the conveyor belt. However, if the lower covering layer is too thick, the running resistance of the conveyor belt will increase. 

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