GB/T 8629-2017 English PDF (GB/T8629-2017)

GB/T 8629-2017: Textiles -- Domestic washing and drying procedures for textile testing
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GB/T 8629-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.01
W 04
Replacing GB/T 8629-2001
Textiles - Domestic Washing and Drying Procedures for
Textile Testing
(ISO 6330:2012, MOD)
ISSUED ON: MAY 12, 2009
IMPLEMENTED ON: DECEMBER 01, 2010
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.
Table of Contents
Foreword ... 4 
1 Scope ... 7 
2 Normative References ... 8 
3 Terms and Definitions ... 8 
4 Principle ... 9 
5 Apparatus and Materials ... 9 
5.1 Automatic washing machines ... 9 
5.2 Tumble dryers ... 9 
5.3 Electrically (dry) heated flat-bed press ... 10 
5.4 Line drying ... 10 
5.5 Drying racks ... 10 
5.6 Ballasts ... 10 
6 Reagents ... 10 
6.1 Reference detergents ... 10 
6.2 Water ... 12 
7 Conditioning and Testing Atmosphere ... 12 
8 Wash Load... 12 
8.1 Total wash load ... 12 
8.2 Number of specimens ... 12 
8.3 Selection of ballast ... 12 
8.4 Ratio of load to ballast ... 13 
9 Washing Procedure ... 13 
10 Drying Procedure ... 14 
10.1 Open-air dry ... 14 
10.2 Tumble dry ... 15 
11 Test Report ... 16 
Annex A (Normative) Specification for Reference Washing Machine Type A —
Horizontal Axis, Front-loading Type ... 18 
Annex B (Normative) Specification for Wash Procedures for Reference Washing
Machine Type A ... 19 
Annex C (Normative) Specification for Reference Washing Machine Type B —
Vertical Axis, Top-loading Agitator Type ... 22 
Annex D (Normative) Specification for Washing Procedures for Reference Washing
Machine Type B ... 23 
Annex E (Normative) Specification for Reference Washing Machine Type C —
Vertical Axis, Top-loading Pulsator Type ... 24 
Annex F (Normative) Specification for Washing Procedures for Reference Washing
Machine Type C ... 25 
Annex G (Normative) Specification for Tumble Dryers ... 26 
Annex H (Normative) Specifications for All Ballast Types Used in Washing ... 27 
Annex I (Normative) Nominal Percentage Composition for Non-phosphate Powder
Reference Detergent 1 ... 28 
Annex J (Normative) Nominal Percentage Composition for Non-phosphate Reference
Detergent 2 ... 30 
Annex K (Normative) Nominal Percentage Composition for Non-phosphate
Reference Detergent 3 ... 31 
Annex L (Normative) Nominal Percentage Composition for Reference Detergent 4 . 32 
Annex M (Normative) Nominal Percentage Composition for Non-phosphate Liquid
Reference Detergent 5 ... 33 
Annex N (Normative) Nominal Percentage Composition for Powder Reference
Detergent 6 ... 35 
Annex O (Normative) Distribution and Mixing of Reference Detergent 2, 3 or 6 ... 36 
Annex P (Normative) Determination of Cycle Drying Time for Tumble Dryers With a
Timer Device ... 38 
Annex Q (Informative) Drying Procedure — Oven Dry ... 40 
Textiles - Domestic Washing and Drying Procedures for
Textile Testing
1 Scope
1.1 This standard specifies domestic washing and drying procedures for textile testing. The
procedures are applicable to textile fabrics, garments or other textile articles which are subjected
to appropriate combinations of domestic washing and drying procedures. This standard also
specifies the reference detergents and ballasts for the procedures.
1.2 This standard specifies the following washing procedures:
a) 13 different washing procedures based on the use of the reference washing machine Type A:
horizontal axis, front-loading type;
b) 11 procedures based on the use of the reference washing machine Type B: vertical axis,
top-loading agitator type;
c) 7 procedures based on the use of the reference washing machine Type C: vertical axis,
top-loading pulsator type.
1.3 Each washing procedure represents a single domestic wash.
1.4 This standard also specifies six drying procedures:
A — Line dry
B — Drip line dry
C — Flat dry
D — Drip flat dry
E — Flat press
F — Tumble dry
Note: When decided through consultation between all parties concerned, oven drying procedure may be used,
see also Annex Q.
1.5 A complete test consists of a washing and drying procedure.
5.2.1 Type A1 tumble dryer – Vented
The specification for Type A1 tumble dryer is given in Annex G.
5.2.2 Type A2 tumble dryer – Condenser
The specification for Type A2 tumble dryer is given in Annex G.
5.2.3 Type A3 tumble dryer – Large vented
The specification for Type A3 tumble dryer is given in Annex G.
5.3 Electrically (dry) heated flat-bed press
If this method of drying is used, the type of press shall be specified among the interested parties.
5.4 Line drying
For procedure for line drying, see 10.1.1; for drip line drying, see 10.1.2.
5.5 Drying racks
Use screen drying racks of approximately 16 mesh stainless steel or plastic for flat drying (see
10.1.3) or drip flat drying (see 10.1.4).
5.6 Ballasts
5.6.1 Type I, 100% Cotton ballast
The nominal composition of 100% Cotton ballast is given in Annex H.
5.6.2 Type II, 50% Cotton/50% Polyester ballast
The nominal composition of 50% Cotton/50% Polyester ballast is given in Annex H.
5.6.3 Type III, 100% Polyester ballast
The nominal composition of 100% Polyester ballast is given in Annex H.
6 Reagents
6.1 Reference detergents
6.1.1 Reference detergent 1
Reference detergent 1 is a non-phosphate powder detergent without enzymes and is available both
with and without optical brightener. [Other designations are 1993 AATCC standard reference
detergent without optical brightener (WOB) and 1993 AATCC standard reference detergent with
optical brightener.]
Reference detergent 1 can only be used in machine Type B. The nominal composition of reference
detergent 1 is given in Annex I.
6.1.2 Reference detergent 2
Reference detergent 2 is a non-phosphate powder detergent with optical brightener and with
enzymes (another designation is IEC reference detergent A∗). Reference detergent 2 can be used
in both machine Type A and Type B. The nominal composition of reference detergent 2 is given in
Annex J. For distribution and mixing, see Annex O.
6.1.3 Reference detergent 3
Reference detergent 3 is a non-phosphate powder detergent without optical brightener and without
enzymes (Another designation is ECE reference detergent 98). Reference detergent 3 can be used
in both machine Type A and Type B. The nominal composition of reference detergent 3 is given in
Annex K. For distribution and mixing, see Annex O.
6.1.4 Reference detergent 4
Reference detergent 4 is a non-phosphate powder detergent with optical brightener and with
enzymes. [Another designation is JIS K 3371 (Category 1).]. Reference detergent 4 can only be
used in washing machine Type C. The nominal composition of reference detergent 4 is given in
Annex L.
6.1.5 Reference detergent 5
Reference detergent 5 is a non-phosphate liquid detergent and is available both with and without
optical brightener (WOB) (Other designations are 2003 AATCC standard reference liquid
detergent with optical brightener and 2003 AATCC standard reference liquid detergent without
optical brightener). Reference detergent 5 can only be used in washing machine Type B. The
nominal composition of reference detergent 5 is given in Annex M.
6.1.6 Reference detergent 6
Reference detergent 6 is a non-phosphate powder detergent with optical brightener and without
enzymes. (Another designation is SDC Reference Detergent Type 4). Reference detergent 6 can be
used in machine Type A. The nominal composition of reference detergent 6 is given in Annex N.
For distribution and mixing, see Annex O.
For cellulosic products, the Cotton ballast, Type I shall be used (see 5.6.1). For synthetic products
and products that are made of blends, either the Polyester/Cotton ballast, Type II or the Polyester
ballast, Type III shall be used (see 5.6.2 and 5.6.3).
Note: Type III polyester ballast (see 5.6.3) may be used for other fiber products not specified in this standard.
8.4 Ratio of load to ballast
If dimensional stability is being determined, not more than half of the wash load shall consist of
test specimens.
Note: In the case of testing a whole garment, report the ratio of load to ballast if it is more than 1/1.
9 Washing Procedure
9.1 Select the washing procedure to be used from those given in Annex B for a type A reference
washing machine, from Annex D for a type B reference washing machine, or from Annex F for a
type C reference washing machine.
9.2 Weigh the (individual) specimens or made-up articles or garments before washing if
measurement of weight loss is required or if they are to be tumble dried.
9.3 Place the material to be washed in the washing machine (see 5.1.1 to 5.1.3) and add
sufficient ballast (see 5.6) to make a total air-dry material load of the mass shown in 8.1 using the
washing procedure selected.
The specimen and the ballast shall be evenly mixed before it is loaded into the reference machine.
a) In Reference washing machines Type A, add (20 ± 1) g of the reference detergent 2, 3 or 6
directly into the dispenser.
b) In Reference washing machines Type B fill the machine with water at the selected
temperature, then add (66 ± 1) g of reference detergent 1 or add (100 ± 1) g of reference
detergent 5, or if reference detergent 2 or 3 is used, add the appropriate amount to provide
good running suds having a height of not more than (3 ± 0.5) cm at the end of the washing
cycle.
c) In reference machines Type C, fill the machine with water at the selected temperature, then
add 1.33 g/l of reference detergent 4 directly into the dispenser.
d) See Table 1 for a summary of the reference detergent dosage.
horizontal screen drying rack (see 5.5) or perforated surface; remove the wrinkles by hand without
stretching or distorting. Allow the specimen to dry in still air in ambient conditions.
Note: For subsequent testing, the drying may be carried out in a conditioned atmosphere according to GB/T
6529.
10.1.4 Procedure D — Drip flat dry
Follow the procedure in 10.1.3 without extracting the water.
10.1.5 Procedure E — Flat press
Remove the specimen from the washing machine and place the specimen on the flat bed of the
press (see 5.3). Smooth out heavy wrinkles by hand and lower the head of the press, which shall
be set at a temperature suitable for the specimen to be pressed, for one or more short periods as
required to dry the specimen. Record the temperature and pressure used.
10.2 Tumble dry
10.2.1 Procedure F — Tumble dry
At the end of the selected washing procedure, immediately remove the load and place the
specimens and the ballast in the tumble dryer (see 5.2). Tumble dry the load as specified in either
10.2.2, 10.2.3 or 10.2.4.
10.2.2 Timer setting for tumble dryer
To determine the optimum heat setting, tumble dry the load at the normal (high) heat setting for
the calculated test cycle time as determined by the method described in Annex P. At the end of the
calculated test cycle time, the final moisture shall be equivalent to the moisture content of the
conditioned textile relative humidity.
If measuring the fabric temperature during tumble drying is required, plastic ribbons
(thermos-labels) that indicate the temperature shall be affixed to the fabric. These thermos-labels
shall be capable of measuring in the temperature range (40 to 90)℃.
For the machines specified in 5.2, ensure that the temperature of the exhaust from the drum is set
at a minimum temperature of 40℃ and not exceeding 80℃ for normal fabrics and 60℃ for
delicate fabrics. Operate the dryer until the load is dry, and continue tumbling for 5 min with the
heat turned off. Remove the fabrics immediately.
10.2.3 Over-drying
Over-drying is characterized by drying to a final moisture level below the conditioned state.
Annex O
(Normative)
Distribution and Mixing of Reference Detergent 2, 3 or 6
O.1 General warning
This annex calls for the use of substances/procedures that may be injurious to the
health/environment. It refers only technical suitability and does not absolve the user from legal
obligations or professional regional recommendations relating to health and safety/environment at
any stage.
O.2 General information
The reference detergent 2, 3 or 6 is distributed in three separate parts:
a) detergent base powder;
b) sodium perborate tetrahydrate;
c) bleach activator tetra-acetylethylene diamine;
They shall be mixed prior to use according to the following procedure.
For consistency, it is desirable to dry mix the three separate parts in the proportions of:
— 77% detergent base powder,
— 20% sodium perborate, and
— 3% bleach activator
Weigh the quantity of detergent components to make up the detergent dose required for the test.
The components shall be mixed together thoroughly prior to use. Mixed detergent shall be stored
in a sealed container if it is not used immediately. The maximum storage time prior to use of each
reference detergents after mixing of detergent components shall be 14 d. All detergent components
shall be within their expiry date at the time of use.
O.3 Effect of enzymes (applicable to detergents 2 and 3 only)
If it is desirable to evaluate the effects of enzymes, the optional addition of the following enzymes
to detergents 2 and 3 can be made with a corresponding reduction in the detergent powder.
Annex P
(Normative)
Determination of Cycle Drying Time for Tumble Dryers With a Timer Device
P.1 Method of estimating cycle time
P.1.1 Use a load composed entirely of 100% ballast (see 5.6) and condition it in the standard
atmosphere (see Clause 6). Determine the conditioned mass of the load, in kilograms, to the
nearest 0.05 kg.
P.1.2 Wash the load as specified in Clause 8. After spinning, weigh the load (initial mass).
P.1.3 Set the tumble dryer (5.2) to a time in excess of 80 min and let it run. After 30 min (or 60
min if preferred) stop the machine, remove the load and weigh. Calcula...