Retsch AS 450 control Manuel d'utilisateur télécharger pdf (Page 31)

Working instructions

7.2 Overview Table

Sieving aids

Quantity for

each sieve /

material to be

sieved

Supplier

Area of Application

Note!!

Rubber balls

5 pcs., Ø20 mm

RETSCH, Haan

with fine, dry materials that are

difficult to separate and the use of

projection sieve shakers

When mechanical sieving aids are

used, there is a danger that soft

materials may disintegrate and

damage can occur to fine sieve

meshes!

Agate balls

10 pcs., Ø10 mm

RETSCH, Haan

Hard porcelain balls

approx. 10gr., Ø2

RETSCH, Haan

Vulkollan® cube

5 pcs., 12x12

RETSCH, Haan

when using planetary sieve

shakers

in manual sieving

Brushes

3 pcs.

RETSCH, Haan

Plastic rings

3 pcs., various

diameters

Small brush

highly dispersed silicic acid

0.5 to 2%

Degussa,

Frankfurt-on-Main

with fine, sticky materials that

contain fat and are

electrostatically charged

Before adding, check usability and

compatibility!

- “ - Aluminium oxide

0.5 to 1%

Degussa,

Frankfurt-on-Main

- “ – activated carbon

-  - talcum

with crude rubber and rubber

powder

Degreasing

When the material being sieved is

very greasy

The material being sieved and the

grain size must not be changed by

the solvent during degreasing or by

the temperature and air during

drying.

Drying

When the material being sieved is

very wet/very damp

Guide dry, warm air through

the sieve stack

When the material being sieved is

hygroscopic

Send water vapour through

the material

When the material being sieved is

coarse and electrostatically

charged

First screen with the fine

sieve and then with the

coarse sieve.

If it is important to prevent

contamination from other

mechanical aids, such as e.g.

rubber balls.

The coarse material works like a

mechanical sieving aid (balls) on the

fine sieves.

Intermittent sieving

RETSCH, Haan

for fine materials that stick easily

and drop only with difficulty

through the shaker.

Intermittent switching is built into

most projection sieve shakers and

can be switched on as required.

7.3 Sieving Sample Quantities

The stack of sieves required for the sieve analyses consists of test sieves arranged

one on top of the other in ascending order of aperture size as well as the collecting

pan.

To ensure quick fractioning with an exact result, the quantity of the material being

sieved must be adapted to suit the sieve diameter as well as the nominal diameter

of the openings. Guidelines are obtained in the respective standards for the sieve

analyses.

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Retsch AS 450 control Manuel d'utilisateur Page 31

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