GB_T 3198-2010 Aluminum and aluminum alloy foil - pinhole

GB_T 3198-2010 Aluminum and aluminum alloy foil - pinholes: The number of pinholes and the diameter of pinholes of aluminum foil should comply with the provisions of the table, and when it is necessary to use high-precision or ultra-high-precision grade, it should be indicated in the contract (or order form), and it will be supplied
as ordinary grade when not specified.
Testing equipment: PAHT-30 aluminum foil pinhole tester test principle: under the specified environment and light box light source, use the light transmittance of aluminum foil pinholes to observe the number of pinholes and measure the size
of pinholes.
Observation room and pinhole box: The pinhole box is a wooden or recovery box, and the surface of the pinhole box is equipped with a piece of frosted glass with a thickness of 5 mm, and the surface of the frosted glass is left with a surface of not less than 0.
1 m'
.
The inspection surface is lined with paper to block the scattered light, and the box is equipped with fluorescent lamps, which are evenly distributed
in the box.
The illuminance in the pinhole box is 1 200 1lx~~1 500 1x, the ground-glass transmission illuminance is about 1 000 lx, the light is evenly distributed on the detection surface, and the ambient illuminance is 20 lx-~50 lx
.
Prepare the sample: the sample is cut off from the foil roll, and the surface of the sample should be flat, without wrinkling and bending phenomenon
.
The size of the specimen should be equal to or larger than the size of the inspection surface as much as possible, otherwise the inspection surface that the specimen cannot cover to prevent affecting the inspection effect
.
Test method: 1.
The observation distance is 0.
5 m, and the observer's visual acuity (or corrected visual acuity) is 5.
0
.
2.
Double aluminum foil faces the observer darkly, counting
the visible pinholes.
3.
The pinhole size can be measured
by 10 times ~ 20 times ruler magnifying glass or vertical microscope.
Equipment parameters: light source power 15W, 30W, 45W three gears optional magnification 80X, 40X optional application ambient illumination 1200Lux-1500Lux Minimum resolution 0.
01mm Maximum measuring aperture 4mm Observation window size 400×250mm Dimensions 800(L)×600(B)×300(H)mm net weight 24kg