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YBB 00122003-2015: Test for Welding Strength
YBB 00122003-2015
YY / YBB
PETROCHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
YBB 00312003-2015
Test for Welding Strength
ISSUED ON. AUGUST 11, 2015
IMPLEMENTED ON. DECEMBER 01, 2015
Issued by. China Food and Drug Administration of PRC
Test for Welding Strength
This Standard applies to the determination of the welding strength of plastic welded to plastic
or other base materials (such as aluminium foils) and the welding strength of plastic
compound bags.
Specimen preparation
Material. in accordance with the welding conditions specified for a product, test specimens
are welded on heat seal tester. Cut 5 test specimens of 15.0 mm ± 0.1 mm in width in the
longitudinal and lateral directions apiece from the middle of welding.
Compound bag. as shown in Figure 1, cut altogether 10 test specimens of 15.0 mm ± 0.1
mm in width from the side, back, top and bottom of compound bag, in the direction
perpendicular to the welding part. The difference in the number of test specimens taken from
all parts shall not be greater than 1. The spread length is 100 mm ± 1 mm; if the spread length
is less than 100 mm ± 1 mm, adhesive tape may be used to adhere the material the same
as that of bag to make the spread length of test specimens meet the requirement of 100 mm
± 1 mm, as shown in Figure 2.
Test specimens shall be stored for 4 h in the environment of temperature 23°C ± 2°C, relative
humidity 50% ± 5%; they shall be tested under such conditions.
Method for determination
Take test specimens centred on the welding part; open to 180°; fix both ends of test
specimens to the two clamps of tester. The axis of test specimens shall coincide with the
centre line of the upper and lower clamps; an appropriate degree of tightness is required in
order to prevent test specimens slipping or rupturing in the clamps before test. The spacing
between the clamps is 50 mm; test speed is 300 mm/min ± 20 mm/min; read the maximum
load at the time of separation or rupture of test specimens (with the indication error of tensile
tester controlled within ± 1%).
If test specimens rupture in the clamps, then they are abandoned and test specimens are
taken once again for a retest.
Result evaluation
Test result is expressed by the arithmetic mean value of 5 test specimens in the longitudinal
and lateral directions apiece for materials, or the arithmetic mean value of 10 test specimens
taken from different welding parts for compound bags, as the welding strength of the test
specimens, in N/15 mm.