DE102006008979A1 - Classification method for grain-type or granular and crystalline products e.g. sugar, involves passing product over or through multiplicity of sieves in plansifter up to ten fractions, where it is classified by particle size - Google Patents

Abstract

The method involves passing the product over or through a multiplicity of sieves in a plansifter. The product in the plansifter goes through up to ten fractions and is classified by particle size and the selection accuracy of the fractions averages five to ten percent of the particle size.

Description

The The invention relates to a method for classifying granular, crystalline products, in particular for sifting and classifying of crystalline sugar.

Usually become grainy, crystalline products such as sugar by throw sieves in few, mostly 3 to 5 fractions classified. It creates a high Mass of fine dust and the separation is relatively blurred, resulting in the application of sugar to relatively inaccurate formulations and regulations. For example, must for the resolution of sugar in liquids the dissolution time after the biggest to be accepted grain sizes done while smaller crystals long ago solved are.

at the milling of cereal products and the like are sieves or sieve boxes with a floor and side walls as well as lateral Gutaustragsöffnungen known, being over the upper edges the side walls a sieve surface, For example, a mesh is stretched. The sieves are stackable and can as a stack of sieves in Plansichtern be arranged to use different mesh sizes of screen mesh granular to to separate floury products into different fractions and qualities or to sift. It should be a high throughput at the highest possible Quality, d. H. selectivity the fractions are reached.

sugar and the like crystalline products behave very abrasive, so Plansichter due to the high sieve wear so far did not apply.

Of the The invention is based on the object of a method for classifying of grainy or granular and crystalline products, such as from To develop sugar, which has the disadvantages of the prior art avoids and allows a more accurate classification of such products.

The solution The object is achieved with the features of the claim. by virtue of the classification or screening of crystalline sugar in Plansichtern is a variety of fractions with high selectivity from each other educated.

preferred Embodiments of the method are disclosed in the subclaims. Thus, up to ten fractions can be classified or sighted and the reading accuracy is 5-10% or less on the grain size.

As a result the higher one selectivity the fractions can be extended the scope of sugar and process steps can be better determined. The effort in the crystallization or Milling sugar can be lowered by adding the necessary Grinding work is controlled on the basis of the visual results. Furthermore, can for example, the dissolution time a quantity of sugar in liquid be specified more precisely, resulting in a reduction in production time of 10% or more leads. Also, the amount of sugar used can be better dosed and reduced become.

The Invention will be described in more detail in an embodiment.

In a sugar mill is at least one plan sifter, for example a squarer plan sifter according to WO 93/16815 or others provided by the milled sugar in, usual in the grain muckery Directed to a classification or sifting to grain sizes reach, wherein the viewing process is carried out so that the readout accuracy of the Fractions approx. 5-10% is.

Out PUR foamed screen boxes the sieves arranged in the plan sifter have a base plate as well side walls and partitions for receiving an insert screen frame with webs.

Of the foamed Sieve box has no sharp corners and edges, which makes cleaning easier. The wear is low.

Of the Stainless steel insert screen frame is contour contoured Seal provided what an optimal tightness between Einlegesiebrahmen and sieve box guaranteed. In each field of a screen is a, in particular star-shaped screen cleaner intended for cleaning screen cloth, floor and outlet openings. This consists of a resilient material with three arms and has a foot in the center of gravity, which is longer than the feet below the heads the poor. The heads are on the top with cleaning elements for cleaning of Provided sieve fabric of the screen.

The length difference the feet allows one tilting movement of the sieve cleaner on the bottom plate of the sieve. The screen mesh is on a stainless steel insert frame or another metallic material.

At the rounded outsides, the heads also have a rounded Metal insert on. The metal insert is fixed in a form-fitting manner and arranged so that it only the insert frame, but not the Siebkastenberührt. He allows a more intense movement of the sieve cleaner at much lower Wear. This is especially true when sifting abrasive materials such as sugar beneficial.

To another variant can the heads also as rotatable heads be trained to the intensity the movements of the sieve cleaner and thus the cleaning effect continue to increase.

Claims (3)

Method for classifying granular or granular and crystalline products, such as sugar by means of guide of the product over or through a multitude of sieves in a plan sifter. Method according to claim 1, characterized in that that the product passes through the plan sifter in up to ten Fractions by particle size is classified. Method according to claim 2, characterized in that that the accuracy of reading the fractions at least 5-10% of grain size is.