Introducing Coffee Polishing Technology

For the purpose of removing most of the impurities, the dirt sticks to the outer layer (silk shell) of the coffee beans, increasing the acceptability of the tasting process for the buyer as well as creating a shiny eye for Coffee beans, long ago, Vietnamese exporters have exported polished coffee.

Regardless of the design, the principle of polishing coffee beans has never changed, which is to make the coffee rubbed with honeycomb structure inside the machine, with steel knife panel attached two sides. During the spinning process and running from the top of the feeder to the outlet, the coffee has to be rubbed against the iron and the crumbs are shredded and the coffee shakes.

Coffee polisher
Polishing and cooling machines operate in a factory

Forced rubbing in this way causes the crack rate to rise sharply after polishing, so dry polishing machines are gradually eliminated, especially when buyers demand polishing. Over 90% must be polished twice to reach this level, and of course, the cracking rate (4-5%) will increase and the shrinkage rate will increase accordingly (about 2-3%).

In the world afterwards there are also manufacturers who develop wet polishing machines that satisfactorily deal with the disadvantages mentioned above, but the new problems arise because the technology has to give coffee "bath" with The first step is to remove the silk shells, then polish them so that the amount of waste water into the environment causes producers to face environmental protection agencies and people living around the area complaining. It is not said to spend a lot of energy and fuel to dry the coffee was bathed.

Another German technology developed simultaneously with the wet polishing machine but using the spray technology before it was introduced into the polish seems to have solved the disadvantages of the two lines, however. The simple way is to put the coffee in a bucket, then the automatic mist system will work and the coffee will be stirred for about an hour in a net, rubbing coffee together, And brushes on the wing also make the ball up, but this way there is a downside that is quite large power but the productivity is only 500kg / hour with a loss of about 2% and increased by about 2, 5%. Looking at the dust bucket, we can see a lot of small coffee breaks into it.

In addition, the efforts of many domestic coffee makers have applied advances in other industries to coffee polishing, such as polishing machines using combined irons. The rupture rate is too high and the power consumption is too high, about 100kw for the power of 800kg / h and often have to change the charge.

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Coffee beans are polished and are being cooled

An attempt to create a machine that overcomes all of these shortcomings when it seems like giving up, but with perseverance as well as combined with years of experience in the industry. After 3 years of experimentation and improvement, from 2002 to 2005, we have proudly succeeded and brought to Vietnamese coffee processors as well as some foreign companies having houses. Machine in Vietnam contributes to a high quality coffee to many customers in the world.

The machine uses a high pressure spray to spray continuous polishing fog, according to the principle of promoting the coffee beans rubbed against each other for polishing, no honeycombs or knives mounted inside the machine, no sewage, no drying and especially the extremely low loss of lead at 1.1-1.2% escaped in the dust container and silk shell, the rate of broken up after polishing is only 0.2-0.4% , the total power consumption of 30kw / h machine capacity reached 750kg-800kg / hour. Along with the instant cooler, it does not make the coffee color change or become silver after a long period of storage.

The machine is controlled by touch screen and the PLC system automatically controls the startup and shutdown process, which is easy to operate for the workers.