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History of roller press

The first successful roller press was designed in Belgium by Louiseau in response for the need for a small briquette that could be transported over long distances. Roller presses are machines that achieve compaction of particulate matter by squeezing the material between two counter rotating rollers. Pockets formed in the working faces of the rollers form egg or pillow shaped briquettes that weigh in the order of 45 g each. Presses with capacities from 25 to 100 ton per hour can be constructed. Little has changed in the basic design of the presses, major improvements being in the way in which the pressure is applied to the rolls, the materials of construction to improve life and the ease of changing rolls and general maintenance.

Roller presses can also be used with fluted rolls to produce sheets of material that can then be broken up and screened to give a granular product. The granular material would be suitable for mixing with power station feedstock and would solve the handling and moisture problems associated with fine coal.

Briquettes can be produced with the aid of binders or by the use of pressure only either at low temperature or at a temperature where the coal is in the plastic state. The introduction of the Clean Air Act in the U.K. in 1956 saw an increase in high temperature briquetting to produce smokeless fuels from bituminous coals. The advent of cheap North Sea natural gas saw the closure of these processes. Cheap gas and oil has caused a reduction of coal briquette production in most countries although development of briquetting technique has continued as a result of the need to agglomerate many other materials. Improvement in plant throughput has been achieved in a variety of industries by agglomerating the raw feed to the process. Notable uses have been in glass production, iron smelting, zinc refining and the fertilizer industry.

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Why do you need briquetting machine?

1.  Control dust pollution
2.  Reduce volume for less storage space
3.  Add density for materials that go back to the metallurgy furnace secondly.
4.  Recovery the materials that are seen as waste
5.  Obtain products of uniform size and weight
6.  Improve the flowability of the powders, thus preventing problems of feeding, dosage or package.

Engaged in this area for many years, we are provider for briquetting solution.

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Wearing parts of briquetting machine - the roller

Working under high pressure, abrasive environment, the roller of briquetting machine is the most wearing part. The service life is of great importance to the economic profit.

The material of roller is an important factor. What we use is two kinds of alloy steel, 65Mn and 9Cr2Mo (for special purpose, stainless steel is also available). Generally, roller of 65Mn could serve about 6-10 months, while roller of 9Cr2Mo could serve about 12-15 months. Of course, service life also depends on the working hours and the materials you feed into the machine.

Even of the same alloy steel, rollers processed by different thermal treatment show different performance. Our roller would undergo several processes in sequence, annealing to reinforce the tenacity for further machining, quenching to improve the hardness after machining, aging treatment of 6-12 months to eliminate the internal stress. For some extremely abrasive materials, carburization of the roller surface is necessary. The thickness of 2-3mm would extend the service life a lot.

What can you conclude now? Obviously, we are an engaged, serious manufacturer of briquetting machine, briquetting press, roller press. If you need briquetting production line or briquetting plant, come to us for the professional solution.

For more info, please visit briquetting machine manufacturer.

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quicklime briquetting machine



How to choose suitable binder?

How to choose suitable binder?

Briquetting machine is applicable for various powders in waste & by-product, mineral & ore, chemical industry, such as mill scale, steelwork sludge, iron concentrate, sponge iron, magnetite, chrome ore fines, ferrosilicon powder, coal powder, caustic soda, quicklime or burnt lime, etc.

For most occasions, binder is used. Also, there are many different types of binder, which could be categorized into four groups based on mechanism:

1.   Van-der-waals force
2.   Mechanical linkage
3.   Forging
4.   Plasticization under pressure

Facing so many binders, which one is suitable for your material? Engaged in briquetting, HJ Machinery could give you the best professional advice. Both the type of binder and percentage are important.

Wrong type of binder wouldn’t give you satisfied result. And inappropriate percentage has bad influence on the strength.
Too less binder results in briquetting failure, too much binder brings more impurity which reduces the strength.


Binder or not?

Binder works as additives to hold the particles together during briquetting process. With binder coated evenly on the surface, powder could adhere to each other. Many different units come as one strong briquette. So, binder helps a lot for the briquetting machine to achieve the best performance. For wet powder briquetting, the moisture content is controlled around 12-15%. Sometimes, drying process is recommended to reduce moisture. After then, briquette strength comes to its highest level.

However, for some materials, binder is not allowed. Why? Some process has strict control on the impurity. It is binder, meanwhile, also impurity. What should we do for such occasion? Dry powder briquetting machine could solve this problem. Featured with high pressure, hydraulic system of dry powder briquetting machine compresses powder heavily. Van Der Waals force between molecules keep them together, rather than binder adhesion.

These two processes are of different mechanism.