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2022-08-14
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National standard: steel drums for packaging containers (3)

normal align=center> appendix a

normal align=center> (standard appendix)

normal align=center is similar to POM and hips r> steel drum paint film adhesion determination method

normal align=left> this method is applicable to the determination of steel drum paint film adhesion. The fastness of the paint film to the steel barrel bottom material is the adhesion, which is evaluated according to the integrity of the paint film within the scratch range of the square grid, expressed in grade

normal align=left>a1 inspection tool

normal align=left>a1.1 single edge knife, with a 30 ° round blade, the shape and size are shown in Figure A1

normal align=left>a1.2 the spacing width of the guide blade is 1mm, and the shape is shown in Figure A2

a detailed drawing

the blade must be repaired when it is worn to 0.1mm

figure A1 single edge knife

figure A2 guide

a1.3 paint brush: width mm. A1.4 4x magnifying glass. A2 determination method A2.1 sample: prepared according to gb/t1727; Or directly measure on the flat surface of the paint film of the steel barrel. 1. Generally, the speed regulation range is narrow. If there is high speed, there will be no low speed or if there is low speed, there will be no high speed. A2.2 the paint layer should be dry and measured at room temperature. A2.3 scratches: hold the single blade knife by hand, make the front edge of the knife perpendicular to the surface of the template or the flat surface of the steel barrel, use the deflector, maintain stability, and apply even force to cut 6 parallel scratches with a length of about mm and a spacing of 1mm on the paint film at the rate of () mm/s. Then turn 90 ° and draw a square in the same way. The scratches must be straight and cut through the entire depth of the paint film; Scratches should be made in three different places. If the measurement results are inconsistent, it should be repeated in more parts, otherwise the measurement is invalid. A2.4 clean up scratches: use a paint brush to gently brush five times back and forth along the two diagonal directions of the square grid. A2.5 inspection rating: check the square grid scratches by visual inspection or with a 4x magnifying glass, and evaluate the level of paint film adhesion according to the classification in table A1. Table A1 classification level of paint film adhesion measurement results

description

example of scratch grid

0

paint film scratch grid is firmly attached to the can body substrate. It also has a set of rubber characteristics. The scratch grid is complete, smooth, clear and free of peeling

1

the scratch grid of the paint film is firmly attached to the bottom of the can body. However, there are small pieces of peeling at the edge or intersection of the scratch grid. The damaged area is not more than 5%

2

small pieces of peeling can be clearly seen at the edge or intersection of the paint film scratch grid. However, the damaged area of the scratch grid is greater than 5% and less than 15%

3

flakes or strips are damaged at the edge or intersection of the paint film scratch grid, and some small squares are stripped. However, the damaged area of the scratch grid is greater than 15% and less than 35%

4

there are long strips of damage at the edge of the paint film scratch grid, and the small squares in the grid are completely or partially connected into blocks and stripped. However, the damaged area is greater than 35%, and the function of the small system depends on the configuration of system accessories, which is 65%

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