GB/T 33276-2016 PDF in English
GB/T 33276-2016 (GB/T33276-2016, GBT 33276-2016, GBT33276-2016)
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Knitted fabrics and knitted composite fabrics for automotive interior
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GB/T 33276-2016: PDF in English (GBT 33276-2016) GB/T 33276-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
W 59
Knitted fabrics and knitted composite fabrics for
automotive interior
ISSUED ON: DECEMBER 13, 2016
IMPLEMENTED ON: JULY 01, 2017
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Product classification ... 6
5 Technical requirements and quality evaluation ... 6
6 Test method ... 10
7 Inspection rules ... 14
8 Marking, packaging, transportation and storage ... 15
Appendix A (Normative) Elongation at constant load and residual deformation
rate ... 17
Appendix B (Normative) Schopper wear ... 18
Appendix C (Normative) Organic matter volatilization test ... 20
Knitted fabrics and knitted composite fabrics for
automotive interior
1 Scope
This Standard specifies the product classification, technical requirements,
inspection methods, inspection rules, marking, packaging, transportation and
storage of knitted fabrics and knitted composite fabrics for automotive interior.
This Standard applies to knitted fabrics and knitted composite fabrics for
automotive interior, such as canopies, sun visors, door panels, seats, which are
mainly textile fiber raw materials, and processed by knitting technology.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 250, Textiles - Tests for colour fastness - Grey scale for assessing
change in colour
GB/T 2912.2-2009, Textiles - Determination of formaldehyde - Part 2:
Released formaldehyde (vapour absorption method)
GB/T 3820, Determination of thickness of textiles and textile products
GB/T 3917.3, Textiles - Tear properties of fabrics - Part 3: Determination of
tear force of trapezoid-shaped test specimens
GB/T 3920, Textiles - Tests for colour fastness - Colour fastness to rubbing
GB/T 3923.1, Textiles - Tensile properties of fabrics - Part 1: Determination
of maximum force and elongation at maximum force using the strip method
GB/T 4666, Textiles - Fabrics - Determination of width and length
GB/T 4669-2008, Textiles - Woven fabrics - Determination of mass per unit
length and mass per unit area
GB/T 4745, Textiles - Testing and evaluation for water resistance - Spray test
method
GB/T 5713, Textiles - Tests for colour fastness - Colour fastness to water
GB/T 6529, Textiles - Standard atmospheres for conditioning and testing
GB/T 8170, Rules of rounding off for numerical values & expression and
judgment of limiting values
GB 8410, Flammability of automotive interior materials
GB/T 13773.1, Textiles - Seam tensile properties of fabrics and made-up
textile articles - Part 1: Determination of maximum force to seam rupture
using the strip method
GB/T 14801, Test method for skewness and bow in woven and knitted fabrics
GB/T 16991-2008, Textiles - Test for colour fastness - Colour fastness and
ageing to artificial light at high temperatures: Xenon arc
GB 18186-2000, Fermented soy sauce
GB/T 19977, Textiles - Oil repellency - Hydrocarbon resistance test
GB/T 21196.2, Textiles - Determination of the abrasion resistance of fabrics
by the Martindale method - Part 2: Determination of specimen breakdown
FZ/T 01118, Textiles - Testing and evaluation for anti-soil properties - Soil
release
FZ/T 01128, Textiles - Determination of abrasion resistance - Double-head
method
FZ/T 60045-2014, Textile trim materials in the interior of automobiles - Test
method for fogging characteristics
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Knitted laminated fabrics for automotive interior
Cohere the knitted fabrics with polyurethane foam or knitted fabrics, non-woven
fabrics and the like to form two or more layers of composite for automotive
interior.
6 Test method
6.1 Inherent quality
6.1.1 Thickness deviation rate
Perform according to GB/T 3820.
6.1.2 Mass deviation rate per unit area
Perform according to Method 5 of GB/T 4669-2008.
6.1.3 Breaking force
Perform according to GB/T 3923.1.
6.1.4 Tearing strength
Perform according to GB/T 3917.3.
6.1.5 Seam strength
Perform according to GB/T 13773.1. Where, the sewing density is 5 mm/needle,
19# round head needle, 19.7 tex×3 polyester thread (filament).
6.1.6 Elongation at constant load and residual deformation rate
Perform in accordance with the provisions of Appendix A.
6.1.7 Peeling strength
6.1.7.1 Peeling strength (normal)
Perform humidifying and tests on the samples in the standard atmosphere that
is specified in GB/T 6529. Before the test, humidify the sample for at least 24 h.
Take two groups of test samples from the to-be-tested fabrics, namely one
group of warp-direction test samples, and one group of weft-direction test
samples. Each group of test samples contains 3 test samples, which shall avoid
wrinkles and defects; the test sample shall be at least 150 mm away from the
cloth edge, so as to ensure that the test samples are evenly distributed on the
sample. The test sample dimension is 200 mm × 50 mm. Along the length of
the sample, manually peel it off at least 40 mm; respectively clamp it on the
upper and lower clamps of the CRE tensile test machine; set the distance
between the upper and lower clamps to 50 mm; record the curve. Remove the
1/4 part before and after the curve; take the average value of the peak values
in the middle 1/2 part as the result. The test result is expressed by the arithmetic
6.1.12 Dimensional stability during heat storage
Humidify the samples according to the standard atmosphere of GB/T 6529 for
at least 4 h; take two samples whose size is 300 mm × 300 mm. Make three
groups of marking points in the vertical and horizontal directions of each test
sample; make the distance between each group of marking points at 200 mm;
place the test sample on a 16-mesh metal mesh; place it into an oven; start
counting when the temperature reaches 110 °C; take out after 5 minutes;
humidify according to the standard atmosphere of GB/T 6529 for at least 4 h;
measure the distance of each marking point to the nearest 1 mm. Calculate the
dimensional change rate and average value of the sample in the vertical and
horizontal directions; round off the data according to the method of GB/T 8170;
retain the calculation result to one decimal place. Use the minus sign (-) to
indicate decrease (contraction); use the plus sign (+) to indicate increase
(elongation).
6.1.13 Combustion performance
Perform in accordance with GB/T 8410.
6.1.14 Formaldehyde content
Perform according to GB/T 2912.2-2009. Sampling is 2 g. For the formaldehyde
correction solution, take at least 5 concentrations according to 6.2.2 method in
GB/T 2912.2-2009; in addition, add the following 2 concentrations:
0 mLS2 to 500 mL, containing 0 μg formaldehyde/ mL = 0 mg formaldehyde/ kg
fabric;
0.5 mLS2 to 500 mL, containing 0.075 μg formaldehyde/ mL = 3.75mg
formaldehyde/ kg fabric.
6.1.15 Atomization performance
Perform according to 8.2 gravimetric method in FZ/T 60045-2014.
6.1.16 Odor
Take 3 test samples; place them in a 1 L seal can. The seal can shall be
odorless at room temperature and 80 °C; it shall have an easy-open lid. Keep
the seal can clean during the test. Dry in an oven at (80 ± 2) °C for 2 h. After
drying, cool to (60 ± 5) °C; then, evaluate. When the sample thickness is less
than 3 mm, the size is (200 ± 20) cm2; when the thickness is greater than 3 mm
and less than 20 mm, the sample size is (50 ± 5) cm3; the sample thickness
cannot exceed 20 mm; if it exceeds, cut the sample down to a thickness of 20
mm along the use surface of the sample. When smelling, the evaluator shall
put the head close to the can (about 15 cm), and remove the lid; then, fan it by
Perform in accordance with GB/T 19977.
6.2 Appearance quality
6.2.1 In general, adopt light inspection; use 3 ~ 4 40W hooded green
fluorescent tubes, of which the illumination at the cloth surface is ≥1 075 lx, and
the distance between the light source and the cloth surface is 1.0 m ~ 1.2 m.
During the inspection, spread the cloth on the cloth inspection table; perform
the inspection one by one along the warp-direction. The inspector shall look
squarely at the cloth surface; the distance between the eyes and the cloth
surface is 55.0 cm ~ 60.0 cm.
6.2.2 Dimension deviation
Perform according to GB/T 4666.
6.2.3 Color difference
Use the color-changing gray card of GB/T 250 to evaluate.
6.2.4 Weft skew and weft bow
Perform according to GB/T 14801.
7 Inspection rules
7.1 Batch regulations
When the same product has the same raw materials and production processes,
the products of the same cycle (same dyeing tank) are divided into one batch.
7.2 Sampling
7.2.1 Inherent quality
For products which are supplied in the form of sheet material, the drawn sheet
number shall meet all inherent quality indicator performance tests; for products
which are supplied in the form of rolls, randomly select one roll, and cut the test
sample at least 2 m from the head end; its dimensions shall meet all inherent
quality indicator performance test.
7.2.2 Appearance quality
The sampling plan for the inspection of appearance quality is shown in Table 5.
Appendix A
(Normative)
Elongation at constant load and residual deformation rate
A.1 Test equipment
A.1.1 Equipment such as constant-load elongation racks (with fixtures and
weights), or electronic strength machines that meet the test requirements can
be used.
A.1.2 Steel ruler or tape measure, accurate to 1 mm.
A.2 Test steps
A.2.1 Sample preparation
Take at least three samples along both the warp and weft directions. The width
of the knitted fabric sample is (50 + 1) mm; the length is at least 160 mm.
Perform humidifying and tests on the samples according to GB/T 6529. Before
the test, humidify the sample for at least 24 h.
A.2.2 Elongation at constant load
Draw two marking lines in the middle of the sample length direction; make the
distance between the marking lines at 100 mm (L0). After clamping under a
certain load for 30 minutes, measure the length (L1) between the two marking
lines; calculate the constant load elongation according to Formula (A.1).
A.2.3 Residual deformation rate
After the test of elongation at constant load, remove the load from the sample.
Then, after 30 minutes, measure the length (L2) between the two marking lines.
Calculate the residual deformation rate according to Formula (A.2).
A.3 Result expression
Take the average of the three groups of data at warp and weft directions,
respectively, as the result; round off according to GB/T 8170; retain the result
to one decimal place.
Elongation at constant load
Residual deformation rate
Appendix C
(Normative)
Organic matter volatilization test
C.1 Principle
Use a headspace sampler to extract the residual volatile organic compounds in
the samples; use the gas chromatograph-hydrogen flame ionization detector
(GC/FID) for determination; base on the total carbon.
C.2 Test equipment and chemical reagents
C.2.1 Gas chromatograph: with split-splitless-inlet and flame ionization detector
(FID).
C.2.2 Headspace sampler.
C.2.3 Capillary separation column: inner diameter of 0.25 mm; film thickness of
0.25 μm; length of 30 m; 100% polyethylene glycol stationary phase (Wax-type,
such as DB-Wax, Carbowax).
C.2.4 Electronic balance: accuracy of 0.1 mg.
C.2.5 Microliter syringe: accuracy of 5 μL.
C.2.6 Chemical reagents:
a) acetone: HPLC grade.
b) n-butanol: HPLC grade.
c) 2,6-butylated hydroxytoluene (BHT): analytical reagent.
C.3 Test steps
C.3.1 Headspace sampler parameters
C.3.1.1 Temperature: heating furnace 120 °C; quantitative tube 150 °C; transfer
tube 180 °C.
C.3.1.2 Time: The pressure rises for 19 s; the gas is extruded for 16 s; the
injection is continued for 5 s.
C.3.1.3 Pressure: The carrier pressure is 124.80 kPa (18.1 psi or 1.25 bar); the
bottle pressure is 159.96 kPa (23.2 psi or 1.60 bar).
C.3.2 Test conditions
C.3.5 Calibration
C.3.5.1 Draw a calibration curve, so as to quantitatively calibrate the total
carbon volatility and the amount of various special substances. Use acetone as
a calibration substance for total carbon volatilization.
C.3.5.2 After a new separation column is installed, and when the instrument is
modified, use 7 concentrations for basic calibration. In addition, at least use 3
concentrations for controlled calibration every month.
C.3.5.3 When performing basic calibration on the acetone, prepare solutions,
of which the concentrations are 0.1 g/L, 0.5 g/L, 1 g/L, 5 g/L, 10 g/L, 50 g/L, 100
g/L in n-butanol, as a calibration sample. During the controlled calibration, at
least prepare solutions of three concentrations, namely 0.5 g/L, 5 g/L, 50 g/L.
Before the calibration, it shall be ensured that no peaks of n-butanol and
acetone appear simultaneously.
C.3.5.4 All substances which are used during the calibration shall meet at least
the annual quality requirements.
C.3.5.5 During calibration measurement, use a 5 μL syringe to take 2 μL of
solution from a 10 mL glass container and inject it into an empty, air-tight
headspace sample bottle. It shall be noted that there must be no air bubbles in
the syringe.
C.3.5.6 After the calibration sample is subjected to a constant temperature
treatment at 120 °C for 1 hour, perform the analysis according to the test
specifications. After the solvent is diluted, the temperature chart of the gas
chromatograph is interrupted. Perform at least 3 measurements for each
calibration solution.
C.3.5.7 Draw a straight line of the peak area of acetone against the
concentration of the sample; its slope represents the calibration coefficient K [K
(G) represents the total carbon volatilization; K (i) represents the emission of a
single substance].
C.4 Result expression
C.4.1 Recording of data
The data that is recorded in the gas chromatograph shall include the total peak
area and the peak area of the individual substances that are given in the
drawing:
a) Only the peaks need to be considered when calculating the total peak
area;
b) The peak height shall be greater than 3 times the baseline noise value;
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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