Retsch AS 200 tap 30.025.1001 Manuel d'utilisateur télécharger pdf (Page 18)

8 January 2008 Retsch GmbH 18 Doc. no. D 98.025.9999

Working Instructions

Sieving aids

For materials that are difficult to separate we recommend the

additional use of sieving aids in the individual sieve fractions. For

this purpose and depending on the mesh size of the sieve and the

preselected oscillation intensity, balls of agate, rubber, porcelain or

nylon brushes and Vulkollan® cubes can be used. See also the table

below.

Make sure that the sieve mesh is not stretched excessively by

overloading with sieving aids, as this would impair the precision

of your analytical sieves.

For recommendations with regard to quantities of material

to be sieved, see the section on “Sieving Quantities”

Overview Table

Sieving aids

Quantity per

sieve or sieved

material

Supplier

Field of application

Caution !!

Vulkollan® cubes

5 pcs., 12x12

RETSCH, Haan

when planar sieve

machines are used

Brushes

3 pcs.

RETSCH, Haan

Plastic rings

3 pcs., various

diameters

Small brushes

with manual sieving

Highly dispersed silicic acid

(Aerosil)

0.5 to 2%

Degussa,

Frankfurt on

Main

with fine, sticky sieve

materials that contain

fat and are

electrostatically charged

Before adding, check usability and

compatibility!

- - Aluminium oxide

0.5 to 1%

Degussa,

Frankfurt on

Main

- - Talcum

with crude rubber and

rubber powder

Drying

with very wet/very

humid sieve materials

Pass dry warm air through the

set of sieves

with hygroscopic sieve

materials

TAP function

for fine materials that

stick easily and fall

through the machine

with difficulty

A TAP function is built into the AS 200

tap tapping sieve machine and can be

switched off at will.

Quantities of material to be sieved

The stack of sieves required for sieve analysis is made up

of a number of analytical sieves arranged one on top of

the other in ascending order of hole width.

To ensure quick fractioning with an exact result, the

quantity of material to be sieved must be adapted to the

sieve diameter and the nominal diameter of the openings.

Guide levels for this are given in the respective standard

specifications for sieve analysis, e.g. according to DIN

22019/1 the following maximum added quantities are

recommended:

Nominal diameter of

sieve openings

Material quantities in dm

for

diameters of 200mm

0 . 5 0 0

3 . 1 5

0 . 3 0 0

0 . 1 4 0

0 . 5

0 . 1 0 0

0 . 2

0 . 0 6 0

0 . 0 6 3

0 . 0 3 5

0 . 0 2 0

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 27 28

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Retsch AS 200 tap 30.025.1001 Manuel d'utilisateur Page 18

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