Thermocracking Test Method
A dyeing prone to thermocracking is aftertreated with a fixative then
heat treated and its water fastness tested.
The dye-fibre linkage of reactive dyes can be partially hydrolyzed by
the action of heat (thermocracking), resulting in impaired wet fastness
properties. Heat can have this action, for example, during thermofixation of
dyeings. The detrimental effect of thermocracking can be eliminated by
aftertreatment with a cationic fixing agent(Reactive)...
Staining of the adjacent fabric and the shade change are assessed.
Procedure
Dyeing
Material / dyeing
|
cotton tricot, bleached dyed with:
|
a: 3.5 % Cibacron Scarlet 2G-E
pattern card CEL
3161 Cibacron method 1a/1b 85 °C
|
|
b: 4 % Cibacron Red F-B
pattern card 3173
Cibacron F/FN method with mixed alkali
|
|
Note
|
The dyeings must always be
freshly prepared (hydrolysis during storage !) and washed off as well as
possible.
|
Aftertreatment
|
0 - 3 % fixative
|
liquor ratio 40 : 1
|
|
pH 6 - 6.5 adjusted with acetic acid 80 %
|
|
30 min at 40°C
|
|
dry without rinsing
|
|
Heat treatment
|
2 min / 5 min
/ 10 min at 200°C in a stenter
dryer (no contact heat !!)
|
Fastness properties
|
ISO 105/E01 water fastness
test (see enclosure)
|
Assessment
|
The shade change of the test speciment and the staining of the
adjacent fabric are assessed
|
Document Flow
Document flow for the above documents are
as follows :
- Labdip Request Form with the required specification and attached samples from buyers are sent to laboratory for developing the colors and submitted on the specified required date.
- Labdip Register is used to record the Colour Name, Customer name, Specification Receiving date, Submission dates, etc. with corresponding LD#s which are serially followed throughout the year. So the LD# which will be written on the Lab Dye Record Form/Lab Dip For Approval will be taken from the Labdip Register.
- Recipes are made according to the number of shades, depth, and on what machine it will be loaded. Labdip Recipe Form is used for this purpose and the maximum recipe is 26
- If any shade is complete and match with the given standard then recipe is written on the Lab Dye Record Form (Form No. F81-201-3) with sample attached of ‘okay’ labdip and other samples are filed on Labdip Submission Form if only one shade is to be matched. In case of more than two shades to be matched then the Labdip For Approval Form is used to submit to the marketing department in three copies and keeping one copy for laboratory.
- Once the buyer approves the labdips then the approved shades are filed on the Approved Labdips Form and is sent to QC Inspection Department. A copy of this form is attached on the Labdip Submission Form and put together with the Lab Dye Record in a plastic file for future reference at QC Lab.
- In case of rejection on the labdips then the marketing department sends their comments and approval through e-mail according to the labdip numbers specified for each submitted color.
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