Before the test, the sample shall be placed in the standard environment specified in GB/T2918 for 24 hours. Unless otherwise specified, the test shall also be carried out under these conditions.
Preparation of the test piece: When preparing the test piece, it should be considered that the performance of the decorative surface of the product is required to be consistent in the longitudinal and transverse directions. In addition to the performance of the decorative surface, the other requirements of the product in the longitudinal, transverse and frontal directions are also consistent. The preparation position of the test piece shall be within 50 mm from the edge of the product. The size and quantity of the test piece are shown in Table 5.
Appearance quality: Visual inspection should be carried out under natural light conditions that are not exposed to direct sunlight. The plates were placed side by side in the same production direction, and the angle between the plate and the horizontal plane was 70 ° ± 10 °, which was visually observed at a distance of 3 m from the center of the plate surface.
For the various defects visually observed, the maximum dimension is measured using a ruler with a minimum graduation value of 1 mm, which shall not exceed the upper limit specified in the defect in Table 1. Those who take and place samples are not involved in the visual test.
When the visual result of the color difference is controversial, the color difference arbitration test shall be carried out according to the method of GB/T11942, and the consistency of the production direction of the test piece shall be maintained during the test.
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