Retsch AS 400 User Manual download pdf (Page 21)

06.11.2012  Retsch GmbH 21

Working instructions

Sieving aids

When dealing with material that is difficult to separate, we recom-

mend the additional use of sieving aids in the individual sieve frac-

tions. Depending on the width of the sieve meshing and the prese-

lected vibration intensity, pearls made of agate, rubber, porcelain or

nylon bristles and Vulkollan cubes may be used. Also refer to the

table below.

Ensure that the fabric of the sieve is not overstretched by over-

loading with sieving aids as this would have a detrimental effect

on the precision of your analytical sieve.

Refer to the paragraph on sieving material quantities for the rec-

ommended material volume.

Overview table

Sieving aids

Quantity per

sieve or charge

Supplier

Area of use

Caution !!

Vulkollan cubes

5 pcs., 12x12

RETSCH, Haan

Planetary sieving ma-

chines

Bristles

3 pcs.

RETSCH, Haan

Plastic rings

3 pcs., various Ø

Brushes

Manual sieving

Highly dispersed silicic acids

(aerosil)

0.5 to 2%

Degussa, Ffm

Materials to be screened

are fine, sticky, fatty

and electrostatically

charged

Check applicability and compatibility before

adding!

-  - aluminium oxide

0.5 to 1%

Degussa, Ffm

-  - talcum

Latex and rubber pow-

der

Dry

Materials to be screened

are very wet or damp

Guide dry, warm air through the

sieve set

Hygroscopic materials to

be screened

Intermittent sieving

RETSCH, Haan

Materials to be screened

are fine, stick easily, or

only fall through the

mesh with difficulty

Intermittent switching (changes direction of

rotation) is built into the AS400 flat-bed

sieving machine and can be switched on, if

required.

Sieving material quantities

The sieve stack required for sieve analyses is composed of analyti-

cal sieves arranged one above the other, with progressively larger

holes towards the top, plus the base pan.

To ensure fast separation with exact results, the quantity of the

material to be screened should be adapted to the sieve diameter

and the nominal size of the openings.

The relevant standards on sieve analysis (e.g. DIN 22019 / part 1)

state guideline values in which the following maximum charge

quantities are recommended:

Nominal widths of the screen

openings

Material quantities in dm

400 mm sieve diameter

4 , 0 0 0

2 , 4 0 0

2 , 0 0 0

6 , 3

1 , 6 0 0

1 , 4 0 0

3 , 1 5

1 , 2 0 0

0 , 6 0 0

0 , 8

0 , 5 0 0

0 , 5

0 , 4 0 0

0 , 3 1 5

0 , 3 2 0

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 31 32

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Retsch AS 400 User Manual Page 21

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