Belangrijke punten bij suspensiebereiding

Essential points in suspension preparation1. Room:Illumination by TL light with filter (Rohm and Haas, type 303).

Temperature: 20 - 24o C.

One should be attentive to keep out copper, dust, grease and oil.

Each colour should, preferably, have its own preparation room

to prevent confusion in the preparation and the delivery of the

suspensions.

The floor should be cleaned once or twice a day, and kept

permanently wet to keep dust and dirt out.

2. Equipment: Equipment should be kept perfectly clean; spilled suspension

should be removed by means of a sponge at once.

Apparatus and glassware should be cleaned in deionized water

immediately after use.

Burettes require the use of grease-free cocks.

Graduates, feed funnels, jars, etc, should be clearly marked

by the colour they are intended for.

Since it is impossible to distinguish between the colours in

thew preparation room, the colours should be indicated in

clear text on the tape.

Colours are also to be indicated by means of bands of

adhesive tape to be stuck round the apparatus/aids, e.e.,

1 band for green

2 bands for blue

3 bands for red

3. Materials: Liquids (PVAL, deionized water) needed in the preparation of

the suspensions should have the same temperature as that

prevailing in the processing room (20 - 24o C).

Before it is used, the deionized water should be filtered

through a Cuno filtre.

The PVAL (Mowiol) should be pumped through a Sparkler filtre

by means of a Sihi pump before use.

Polythene storage bottles, and especially their cocks, should

be cleaned regularly.

4. Suspensions Before they are supplied to the flowcoating department, the

suspensions should be inspected for purity of their colour.

1. Immerse an object slide to 3/4 of its surface area into

the suspension to be inspected; wipe one side clean.

2. Suspend the slide and let it dry in air.

3. Clamp the dry slide onto the stage of the microscope;

focus with UV illumination on the fluorescent powder.

Microscope specifications

Power of objective : 16X

Total magnification : 16 x 1,6 x 10 = 256x

view field: 550 m.

ADVANCE \Y 708.0

FOR INTERNAL USE ONLY

80-04-01 DIRECTIVES FOR PREPARING 83-03-29 ----------- FLUORESCENT POWDER SUSPENSIONS RV-2-1-53/401 83-04-26 ----------- 91-02-12 FOR COLOUR TV TUBES ----------- name: H. Geerts 72-08-29 2 - 001 010 A4 TV WP5.0 (C) N.V. PHILIPS' GLOEILAMPENFABRIEKEN 1991

4. Inspect for impurities in four places in the view field.

Requirement: max. 5 impurities per inspection point.

object slide

Scale

AB

Inspection point 120140

220125

3 5125

A

4 5140

B

ADVANCE \Y 708.0

FOR INTERNAL USE ONLY

77-08-23 DIRECTIVES FOR PREPARING 83-03-29 ----------- FLUORESCENT POWDER SUSPENSIONS RV-2-1-53/401 91-02-12 ----------- FOR COLOUR TV TUBES ----------- name: H. Geerts 72-08-29 - 002 010 A4 TV WP5.0 (C) N.V. PHILIPS' GLOEILAMPENFABRIEKEN 1991