Machines for the food processing industry
Düsseldorf   .  Deutschland


The DORNOW Roller Peeling Machines of the R-OW Series 
in the Vegetable Processing Industry and in the Tinning and Deep-freezing Industries

 

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 The construction of the rollers was chosen in a way that both an aggressive peeling (when using bad or even scurfy raw material) and a „gentle“ skinning (e.g. of new potatoes or cooked beetroot) is practicable. - The granulation of the coating on the rollers has to be accordingly selected.
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 The construction of the machines of the R-OW series offers a broad range of possibilities to optimise the desired peeling effect; this also goes for tubers and root vegetables with a totally different skin structure: celeriac, kohlrabi, waste potatoes that have been sorted out, fodder potatoes, new potatoes, cooked beetroot, carrots.
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 There were times when the potato processing factories could only get „fodder potatoes“ on the market, which are not normally used anymore for human food. Still, the DORNOW roller peeling machines of the R-OW series could and can, given an appropriate equipment and adjustment of the peeling rollers, make rapidly a usable produce from raw material of inferior quality... Thus, the DORNOW roller peeling machines are designed to give also good service in bad times as far as the quality of raw material is concerned...
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 The sections on the surface of the rollers provide - due to their three-dimensional working - for a steady and constant whirling of the tubers and a smooth peeling. - It was our intention to arrange the rollers in a stationary way which has many advantages.
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 We dispensed with superfluous technical appliances and gadgets (e. g. with rotating drums in which, again, there are a lot of turning rollers). Thus, we were able to avoid, from the beginning, the use of many possible wear parts. - Certain constructional features that seem to be useful and appropriate at first sight and arise astonishment because of the way the technical components are arranged, do not necessarily  prove good and efficient.
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 The DORNOW roller peeling machines of the R-OW series have a very sturdy construction. They are predestinated for a 24-hours service. The low-noise operation of the machines is guaranteed even with fast-rotating peeling rollers. They are extremely robust and have a very long service life!
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 As far as the choice of an adequate machine size is concerned, we recommend to opt for a higher-dimensioned machine so that you can yield good results even with bad raw material. The machines are available with volumes (diameters) in the range of 500, 600, 900, 1,100, 1,300, 1,500 and up to 2,500-mm and with peeling rollers up to 4,000 mm length.
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 The high performances are achieved, accordingly, in one machine of a piece. (It is not necessary to connect two or three machines in stepped arrangement). Thus, you have less rotating parts and you need less spare parts!
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 In roller peeling machines in stepped arrangement (here, e. g. three smaller roller peelers are connected in longitudinal direction), the peeling rollers run, for example during the peeling process, to the right, while they have to rotate in the other direction for the emptying of the various sections. There is the risk that e. g. carrots and potatoes get stuck for some time which causes unnecessary abrasion.
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 The axles of the peeling rollers of the DORNOW roller peeling machines of the R-OW series have a large diameter. This preserves the bearings and guarantees low-noise service.
- The bearings have a double protection against humidity and dirt and are outside the wet zone. They are, moreover, treated against oxidation.
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 Most of the products to be peeled allow peeling without water/waste water. This means, as a rule, considerable savings in costs. - The peeling pulp produced, for example, when peeling potatoes, is collected at a central point in a chute and can be moved by means of e.g. a pump. For non-floatable „dry“ waste a screw conveyor (auger) or a conveyor belt is mounted beneath the machine.
- The V-belts consist of elements and can be opened and closed. - V-belts, guide pulleys and bearings are subject to very little wear and tear.
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Due to the possible micro fine grain peeling, the carrots, potatoes etc. leave the machine as smooth as though they had been peeled by steam. Thus, they absorb considerably less oil during the frying process. - (Advice for laboratory test: „Peel“ the potatoes with a very fine emery paper to obtain a smooth surface. On the other hand use potatoes that have been peeled in the normal way with coarse carborundum. Then cut both lots and fry them in the test fryer. Determine the oil consumption!).
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 No need of expensively produced compressed air, no compressor. These unnecessary high costs have to be added to the purchase price of such machines that work with compressed air. - As for constructions connecting roller peeling machines arranged in steps, in longitudinal direction, these machines (or machine parts) are separated from each other by long flaps which are constantly opened and closed by compressed air. We have done without such constructions, because we think they are expensive gadgets. As to the DORNOW machines of the R-OW series: continuous and low-noise operation, controlled by adjustable worm drives.
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 No constant and virtually useless stop-and-start operations of several peeling roller groups in the DORNOW roller peeling machines of the R-OW series! We renounced the design that necessitates this unjustifiable constructional expenditure, because it increases the power  consumption considerably. -
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 During one peeling process the three groups of rollers are set in motion six times (three times to the left, three times to the right) and stopped three times, too! The unnecessary energy costs have to be added to the purchase price of machines of such a type. It is a matter of fact that the starting of a machine costs a lot of electrical energy.
- No discontinuous system! The potatoes are peeled in a continuous process!
- Automatic lubrication of the bearings is possible.
- Hydraulically working auxiliary tools for removing the peeling rollers can be supplied on request.
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 The peeling rollers can be mounted and taken out rapidly by means of the fast-exchange tool for rollers. This is true of the models of the R-OW-A series.
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 The mounting and dismantling of the peeling rollers will hardly cause any difficulties, not even to those technicians who have not yet had much experience in this field.
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The standard model is provided with jets for atomised water (water mist), divided into two groups (2/3 and 1/3) . Most of the products can be peeled without addition of water.
- If required – it is, however, not necessary – one can add some water to the machine, which does not necessarily produce any waste water. 
- The dry-peeled fruit have small particles on them. If you wish to remove them totally, we can offer you various possibilities.
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 The DORNOW roller peeling machines of the R-OW series use ø 150 mm rollers. The roller peelers of the "100" series have peeling rollers with a diameter of 100 mm.

 
It was DORNOW who built the first roller peeling machines in Europe.
25 years of experience in this field are at your service.

In addition to this treatise we can make available more papers dealing with the subject of PEELING.  

 

This paper contains non-committal notes. We do not lay claim to completeness. Alterations reserved. 
Our order confirmation, accepted by our customers, is in effect upon delivery. The presentation of a new edition of this treatise will substitute for any previous versions. 
Copyright by DORNOW food technology GmbH, D-40549 Düsseldorf

For more information:     www.dornow.de  

Q25 E7

Dornow food technology GmbH, Willstätterstr. 12, D-40549 Düsseldorf - Germany, USt-Id.-Nr. DE119264470
Tel. ++49-211-527060, Mobile ++49-172-2614932, Fax ++49-211-596883, email office@dornow.de, Internet: www.dornow.de, 
Commerzbank AG, Konto-No. 1452333, BLZ 300 400 00, Managing Director Karl-Dietrich Dornow, Amtsgericht Düsseldorf, HRB 22597