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GB/T 2374-2017 PDF in English


GB/T 2374-2017 (GB/T2374-2017, GBT 2374-2017, GBT2374-2017)
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GB/T 2374-2017: PDF in English (GBT 2374-2017)

GB/T 2374-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.01; 87.060.10
G 55
Replacing GB/T 2374-2007
Dyestuffs – General Rules for Dyeing Test
ISSUED ON. MAY 31, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
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Table of Contents
Foreword ... 3 
1 Application Scope ... 5 
2 Normative References ... 5 
3 Requirements for Materials and Reagents ... 5 
4 Requirements for Apparatus ... 7 
5 Basic Requirements for Dyeing Test ... 7 
6 Control of Dyeing Process ... 10 
7 Evaluation of Dyeing Results ... 11 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 2374-2007, Dyestuffs – General Rules for Dyeing Test.
Compared with GB/T 2374-2007, the major technical changes in addition to the
editorial modifications are as follows.
-- the title and expression of fibre are modified (see 3.3; 3.3 of edition 2007);
-- the structure and expression of dyeing depth are modified (see 5.1; 5.1 of edition
2007);
-- the title and expression of dyed fibre are modified (see 5.2; 5.2 of edition 2007);
-- the expression of standard gradient selection is modified (see 5.3.3; 5.3.3 of
edition 2007);
-- the expression of dyeing bath ratio is modified (see 5.4; 5.4 of edition 2007);
-- the expression of use amount calculation of reagents and auxiliaries is modified
(see 5.5.1; 5.5.1 of edition 2007);
-- the title, structure and expression of visual evaluation are modified (see 7.1.1;
7.1.1 of edition 2007);
-- the expression of instrument measurement is modified (see 7.1.2; 7.1.2 of edition
2007);
-- the recommended colour difference boundary values in the instrument
measurements for the determination whether the shade conforms or not (see
7.1.2);
-- “evaluation of results” is moved to 7.1.1 “visual evaluation” (see 7.1.1.5; 7.3 of
edition 2007).
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Dyestuffs (SAC/TC 134).
The drafting organizations of this Standard. Zhejiang Runtu Co., Ltd., Shenyang
Research Institute of Chemical Industry, National Centre of Quality Supervision and
Inspection for Dyestuff.
The main drafters of this Standard. Dong Zhongsheng, Gu Weidi, Zhu Minghui, Chen
Sufen, Wang Yong.
The previous editions of the standard replaced by this Standard are as follows.
Dyestuffs – General Rules for Dyeing Test
1 Application Scope
This Standard specifies the requirements for materials and reagents, requirements for
apparatus, basic requirements for dyeing test, control of dyeing process and evaluation
of dyeing results in dyeing (or printing) tests.
This Standard applies to dyeing (or printing) tests of all varieties of dyestuffs.
2 Normative References
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
GB/T 4841.1-2006, Colour Cards of Standard Depths for Dyeing with Dyestuffs 1/1
GB/T 4841.2-2006, Colour Cards of Standard Depths for Dyeing with Navy Blue
and Black Dyestuffs
GB/T 4841.3-2006, Colour Cards of Standard Depths for Dyeing with Dyestuffs 2/1,
1/3, 1/6, 1/12, 1/25
GB/T 6682-2008, Water for Analytical Laboratory Use – Specification and Test
Methods
GB/T 6688-2008, Dyestuffs – Determination of Relative Strength and Color
Difference – Instrumental Method
GB/T 8170-2008, Rules of Rounding off for Numerical Values and Expression and
Judgement of Limiting Values
GB/T 25811, Standard Bleached Polyester Fabric Used for Dyeing Test
GB/T 25812, Standard Bleached Cotton Fabric Used for Dyeing Test
GB/T 25813, Standard Bleached Cotton Yarn Used for Dyeing Test
3 Requirements for Materials and Reagents
3.1 Reagents
The chemical reagents and dyeing auxiliaries used in dyeing test shall be the normal
5.1.2.2 Colour fastness
When colour fastness is tested, one or several depths may be tested as required by
the applications of all dyestuffs. Each depth for dyeing selected shall be as specified
in GB/T 4841.1-2006, GB/T 4841.2-2006 and GB/T 4841.3-2006. The standard depth
for dyeing 1/1 or 1/3 may be selected as a general rule; the standard depth for dyeing
light navy blue or light black may be selected for navy blue and black dyestuffs.
5.1.2.3 Other dyeing performances
The depths for dyeing shall be specified in the standard or test method when the other
dyeing performances of dyestuffs are tested. Unless otherwise stated, the standard
depth for dyeing 1/1 specified in GB/T 4841.1-2006 is used as a general rule.
5.2 Dyed fibres
5.2.1 Selection of fibres
Select appropriate categories of fibres in accordance with the nature of dyestuffs to be
tested; select yarns or fabrics in accordance with the test purpose. The yarns or fabrics
selected shall satisfy relevant quality specification standards or requirements. They
shall be specified in detail in the method standards or products of all varieties of
dyestuffs as a general rule.
5.2.2 Weighing of yarns or fabrics
The weight of yarns or fabrics used for dip dyeing test shall be accurate to 0.01 g at
least.
The fabrics for pad dyeing and printing shall be cut into an appropriate size as required,
without weighing.
5.2.3 Pretreatment of yarns or fabrics
All yarns or fabrics shall be treated first before dyeing test as a general rule; the
methods and conditions for treatment shall be specified in detail in the test methods of
all varieties of dyestuffs.
The yarns or fabrics which have been treated and washed shall be dehydrated of
excessive water. The water brought into the dye vat along with the yarns or fabrics is
not included in the volume of dye liquor.
5.3 Dyestuffs
5.3.1 Weighing
The dyestuffs for dip dyeing shall be weighed accurately to 0.000 2 g; the dyestuffs for
pad dyeing and printing shall be weighed accurately to 0.001 g. During pad dyeing and
printing, the standard dyed samples and dyed samples of dyestuffs shall be weighed
6.3 During hand dyeing, the stirring degree of all dye vats shall be kept consistent;
keep stirring within 15 min from the beginning of dyeing and then stir once every 5 min
henceforth. Try to make the times of stirring consistent. The splash of dye liquor out of
the dye vats shall be avoided during stirring; after stirring, the yarns or fabrics shall not
be exposed above the liquor surface.
6.4 Before dying, all fibres shall be marked, dyed in sequence and taken out after
dyeing in the same sequence and for the same time interval to ensure the times of
dyeing for all dyed samples are the same. In addition, the other controlling factors for
all dye vats shall be kept consistent.
6.5 During the process of dyeing (especially the hand boiling dyeing for a long time),
attention shall be paid to the volume of dye liquor; water of the same temperature as
that of dye liquor shall be added if necessary to maintain a certain bath ratio.
6.6 During pad dyeing, the pick-up ratios of all dyed samples shall be consistent; the
deviation of temperature control for pre-baking and baking shall not be greater than
2°C.
6.7 During printing, the pressures around the printing equipment shall be consistent;
the running speed of scraper shall be constant.
6.8 After dyeing, the dyed samples shall be treated in accordance with the
posttreatment method specified; then the dyed samples are suspended in an airflow
containing no hazardous gas for drying. Direct sunlight exposure shall be avoided.
They may also be suspended in an electric heating drying oven of temperature not
exceeding 60°C for drying.
6.9 The dyed samples shall be stored for some time after drying; they shall be
evaluated after the shade becomes stabilized. The dyeing samples for the evaluation
of shade and relative strength shall be dyed uniformly; the depths of standard dyed
samples and dyed samples shall satisfy the depth interval specified for dyeing.
7 Evaluation of Dyeing Results
7.1 Evaluation of shade and relative strength
7.1.1 Visual evaluation
7.1.1.1 Environmental conditions
The reflected light of the objects outside shall be avoided; the tone of the surroundings
shall be of neutral grey of medium lightness. The evaluation may be conducted under
the natural daylight satisfying the environmental conditions, and may also be
conducted under a D65 standard light source of illuminance not lower than 600 lx.
During arbitration tests, evaluation shall be conducted under a D65 standard light
source.
......
 
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