GB/T 12705.2-2024 English PDF (GBT12705.2-2024)

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GB/T 12705.2-2024: Textiles - Methods of testing the down-proof property - Part 2: Tumble test
GB/T 12705.2-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 59.080.30
CCS W 04
Replacing GB/T 12705.2-2009
Textiles - Methods of testing the down-proof property - Part
2: Tumble test
ISSUED ON: APRIL 25, 2024
IMPLEMENTED ON: NOVEMBER 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Principle ... 7
5 Equipment, utensils and materials ... 7
6 Samples ... 9
7 Conditioning and test environment ... 9
8 Sample preparation ... 9
9 Selection of test conditions ... 12
10 Test steps ... 14
11 Calculation and evaluation of test results... 14
12 Test report ... 15
Appendix A (Informative) Test equipment ... 16
Textiles - Methods of testing the down-proof property - Part
2: Tumble test
1 Scope
This document describes a method for determining the down-proof property of fabrics
and products made from them by the tumble method.
This document applies to textile products filled with down and feathers and the fabrics
used to make such products.
This document does not apply to products filled with a blend of down, feathers and
other fillings.
2 Normative references
The provisions of the following documents constitute the essential clauses of this
document through normative references in this text. Among them, for referenced
documents with dates, only the versions corresponding to the dates are applicable to
this document; for referenced documents without dates, the latest versions (including
all amendments) are applicable to this document.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 8170 Rules of rounding off for numerical values and expression and judgment
of limiting values
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for textile
testing
GB/T 17685-2016 Down and feather
GB/T 31907 Method of garment measurement
QB/T 1514-2011 Needles for household sewing machines
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 down-proof property
The property of a fabric to prevent feathers, down, down fibers and feather fibers from
sticking out from its surface.
NOTE: It is generally expressed by the number of the roots of the down sticking out from the fabric
under specified conditions.
4 Principle
The fabric sample is made into a sample bag of a certain size, and a certain mass of
down and feather filling is filled into it, or the down and feather products are directly
used as samples. The sample bag or sample is placed in the rotary box of the down-
proof testing machine equipped with a rubber ball. The rotary box rotates at a constant
speed to bring the rubber ball to a certain height and impact the sample in the box to
simulate the various squeezing, rubbing, collision and other effects that the down and
feather products are subjected to during use. The down-proof property of fabrics or
down and feather products is evaluated by counting the number of feathers, down, down
fibers and feather fibers sticking out from the inside of the sample bag or sample.
5 Equipment, utensils and materials
5.1 Down-proof testing machine
The down-proof testing machine consists of a rotary box that can rotate forward and
backward and its electrical control part, has the functions of a preset number of
revolutions and automatic stop when the number of revolutions is full. The rotary box
is a cube with a smooth inner wall made of transparent organic glass. The testing
machines are divided into small box down-proof testing machines and large box down-
proof testing machines according to the size of the rotary box. The internal dimensions
of the rotary box of a small box down-proof testing machine are (45±0.8) cm × (45±0.8)
cm × (45±0.8) cm, and the rotary box speed is (45±1) r/min; the internal dimensions of
the rotary box of a large box down-proof testing machine are (60±1.0) cm × (60±1.0)
cm × (60±1.0) cm, and the rotary box speed is (42±1) r/min.
Appendix A gives a diagram of the testing machine for reference; other instruments
with the same performance may be used.
5.2 Rubber ball
The specifications of the rubber ball are shown in Table 1, and the shape of the special-
shaped ball is shown in Figure 1.
8.2.4 Use an electric heat gun (5.7) to seal the laboratory seams and rolled edges of the
sample bag (make sure the needle holes of the laboratory seams are sealed). The side
seams and surface seams of the original product are kept without sealing.
8.3 Preparation of test specimens for whole-piece product testing
For whole-piece down garments and other down and feather products (the clothing
length or length is less than or equal to 40 cm), a representative sample can also be
directly selected as a test specimen for whole-piece testing (this shall be noted in the
report). Measure the clothing length (or pants or skirt length) of down garments
according to GB/T 31907, and select the corresponding test conditions according to the
provisions of Table 3. Before testing, zip up the down garment to keep it in the use state.
If there are detachable parts without down and feather filling, they shall be disassembled
before testing. If there is a fur collar, it shall be removed. If appropriate, the fur collar
seam can be sealed with glue to prevent the down and feathers from sticking out.
8.4 Specimen washing and drying procedures
If it is necessary to test and evaluate the down-proof property of the sample after
washing, the unsealed sample bag (see 8.1 or 8.2) or the sample to be tested as a whole
(see 8.3) shall be washed and dried once according to the 4N program washing (type A
reference washing machine, reference detergent type-3) and program A drying specified
in GB/T 8629-2017. It may also be washed and dried according to the method and times
agreed upon by the parties concerned. The washed and dried sample shall be
conditioned to equilibrium in the standard atmosphere specified in GB/T 6529 and then
used for testing.
9 Selection of test conditions
9.1 Conventional test conditions
Select the test conditions in Table 3 for testing according to the specimen type.
10 Test steps
10.1 Select the appropriate test conditions according to the type and requirements of
the specimen in accordance with Table 3 or Table 4. Before testing, clean the feathers,
down, down fibers and feather fibers inside and outside the rotary box of the down-
proof testing machine (5.1). Clean the rubber balls (5.2) and place the corresponding
number of rubber balls in the rotary box.
10.2 Clean the feathers, down, down fibers and feather fibers on the outer surface of
the specimen and then put it into the rotating box, one specimen at a time. The whole-
piece down clothing specimen must be cleaned on both the surface and lining before
testing. If the length of the garment is too long, the specimen can be folded in half and
placed horizontally.
10.3 Preset the corresponding number of revolutions of the down-proof testing machine
according to the selected test conditions, press the forward start button, and the rotary
box will start to rotate.
10.4 When the testing machine stops automatically after reaching the full count, take
out the sample bag or the whole-piece test specimen, check and count the number of
feathers, down, dow...