QB/T 5076-2017 English PDF (QBT5076-2017)

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QB/T 5076-2017: Heat sealing biaxially oriented polyethylene terephthalate film
QB/T 5076-2017
QB
LIGHT INDUSTRY STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.140.10
Classification No.: Y28
Filing No.: 57109-2017
Heat sealing biaxially oriented polyethylene terephthalate
film
热封型双向拉伸聚对苯二甲酸乙二醇酯薄膜
ISSUED ON: JANUARY 09, 2017
IMPLEMENTED ON: JULY 01, 2017
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Requirements ... 5
4 Test method ... 6
5 Inspection rules ... 10
6 Marking, packaging, transportation, storage ... 11
Heat sealing biaxially oriented polyethylene terephthalate
film
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking,
packaging, transportation, storage of heat sealing biaxially oriented polyethylene
terephthalate film.
This standard is applicable to heat sealing biaxially oriented polyethylene terephthalate
film (hereinafter referred to as film), which is made of polyethylene terephthalate as the
main raw material, through multi-layer co-extrusion and biaxially oriented process.
2 Normative references
The following documents are essential to the application of this document. For the dated
documents, only the versions with the dates indicated are applicable to this document;
for the undated documents, only the latest version (including all the amendments) is
applicable to this standard.
GB/T 1037-1988 Test method for water vapor transmission of plastic film and sheet
- Desiccant method and water method
GB/T1038-2000 Plastics - Film and sheeting - Determination of gas transmission -
Differential-pressure method
GB/T 1040.1-2006 Plastics - Determination of tensile properties - Part 1: General
principles
GB/T 1040.3-2006 Plastics - Determination of tensile properties - Part 3: Test
conditions for films and sheets
GB/T 2410-2008 Determination of the luminous transmittance and haze of
transparent plastics
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing
GB/T 6672-2001 Plastics film and sheeting - Determination of thickness by
After cutting off 3 ~ 5 layers of film on the outer surface of the film roll to be tested,
cut the specimens according to the requirements of the test items.
4.3 Appearance
Visually inspect under natural light or 40 W fluorescent lamp; the sampling area shall
not be less than 1 m2.
4.4 Length deviation and width deviation
The test shall be carried out in accordance with the provisions of GB/T 6673-2001.
4.5 Thickness deviation
The test shall be carried out in accordance with the provisions of GB/T 6672-2001. The
instrument measurement accuracy shall not be less than 1 μm. First sample multiple
layers; remove the upper and lower layers; then test 10 layers.
The average thickness deviation shall be calculated according to formula (1):
Where:
Wa - Average thickness deviation, %;
δ1 - Average thickness, in micrometers (μm);
δ0 - Nominal thickness, in micrometers (μm).
The thickness limit deviation shall be calculated according to formula (2):
Wu - Thickness limit deviation, %;
δ2 - Maximum (minimum) thickness, in micrometers (μm);
δ0 - Nominal thickness, in micrometers (μm).
4.6 Tensile strength and nominal strain at break
The test shall be carried out in accordance with the provisions of GB/T 1040.1-2006
and GB/T 1040.3-2006, using type 2 specimens which have a specimen width of 15
mm; the initial fixture spacing is 100 mm; the test speed is (100 ± 10) mm/min; the
longitudinal and transverse directions are tested, respectively. The number of specimens
is 5 each. The results are taken as the arithmetic average.
4.7 Thermal shrinkage
4.7.1 Test instruments
The test instruments are as follows:
a) Oven, accuracy ±1 °C;
b) Vernier caliper, accuracy 0.02 mm.
4.7.2 Specimens
The specimen size is 100 mm × 100 mm; the number of specimens is 5. Mark 1 line
each in the longitudinal and transverse directions, indicating the longitudinal and
transverse directions. Use a steel ruler, which has a graduation value of 0.5 mm, to
measure the length of the two lines.
4.7.3 Test steps
Adjust the oven temperature to (150 ± 3) °C. Quickly put the specimen in and start
timing. The specimen is placed flat, kept for 30 minutes. Take it out. After cooling to
the test environment temperature, measure the longitudinal and transverse lengths of
the specimen. Calculate the thermal shrinkage of the specimen. Take the arithmetic
mean as the measurement result, accurate to 1 decimal place.
4.7.4 Calculation
See formula (3)
Where:
S - Heat shrinkage, %;
L0 - Length before heating, in millimeters (mm);
L1 - Length after heating, in millimeters (mm).
4.8 Haze
Test according to GB/T 2410-2008.
4.9 Gloss
Test according to GB/T 8807-1988, with an incident angle of 45°.
4.10 Heat seal strength
4.10.1 Test instrument
Test instruments are as follows:
a) Heat sealer, which has a temperature fluctuation range of ±1 °C;
b) Tensile tester.
4.10.2 Specimens
Cut 5 specimens uniformly in the width direction of the film roll, which have a length
of 150.0 mm and a width of (15.0 ± 0.1) mm.
4.10.3 Steps
During the test, overlap the specimens. Align the two ends and place them flat on the
welding surface of the heat sealer for heat sealing. The heat sealing temperature is
125 °C; the heat sealing welding surface pressure is 0.18 MPa; the heat sealing time is
1 s. With the heat sealing part as the center line, clamp the two ends of the specimen on
the two clamps of the tensile tester respectively, so that the longitudinal axis of the
specimen coincides with the center line of the upper and lower clamps. The clamps are
appropriately tight, to prevent the specimen from slipping and breaking in the clamps.
The initial spacing between the clamps is 100 mm; the test speed is (100 ± 10) mm/min.
Read the maximum load when the specimen breaks. If the specimen does not break at
the heat seal, the specimen is invalid and another specimen is taken for re-test.
4.10.4 Result calculation
The test result is based on the arithmetic mean of 5 specimens, which is expressed in
N/15 mm.
4.11 Wetting tension of treated surface
The test is carried out in accordance with the provisions of GB/T 14216-2008.
4.12 Friction coefficient
Test according to GB/T 10006-1998.
4.13 Oxygen permeability coefficient
Test according to GB/T 1038-2000.
4.14 Water vapor permeability coefficient