Testing standards and appearance quality inspection methods for melamine decorative paper
Appearance quality inspection method
- The height of the inspection table is about 700mm
- The lighting source is three 40W fluorescent tubes, with a spacing of approximately 400mm between the tubes. The length direction of the tubes is parallel to the length direction of the plate,
The height of the lamp tube from the inspection platform is about 2 meters, and natural light should not affect the inspection.
- The inspection personnel should have normal vision (or corrected vision) and inspect one by one at both ends of the board length, with a visual distance of 0.5m-1.5m and a viewing angle of 30 ° -90 °.
- Specific Content
Dry or wet flowers are allowed within 5 mm of the front edge of the board; The total area of dry or wet flowers on the back shall not exceed 5% of the board surface.
- One stain is allowed within 3 mm2-30 mm2 of any 1 square meter board on the front; 3 stains are allowed within 5 mm2-30mm2 of any 1 m2 board surface on the back.
2 scratches with a length of ≤ 100 mm are allowed on any 1 square meter board on the front side, and those that affect the decorative layer are not allowed; Four scratches with a length ≤ 200 mm are allowed on any 1 m2 board surface on the back, and those that affect the decorative layer are not allowed.
No indentation is allowed on the front side; There is allowed to be one area within 20 mm2-50 mm2 of any 1 m2 board on the back.
No obvious transparency is allowed on the front and back sides of 5; The width shall not exceed 10mm, and only one side of the cardboard is allowed to be misaligned; The total surface pore area shall not exceed 3% of the board surface.
- No obvious color mismatch or uneven gloss is allowed on the front and back sides.
- No bubbles are allowed on the front; One blister ≤ 10 mm2 is allowed within any 1 m2 board on the opposite side.
A paper with a front and back surface ≤ 100 mm is allowed to tear at one point per sheet.
- Local paper shortage is not allowed on the front; Local paper shortage of ≤ 10 mm2 on the back is allowed at one point per sheet.
No chipping is allowed on the front side; A chipping edge of ≤ 3 mm is allowed on the reverse side.
- Serious defects such as cracks, layering, and edge defects that affect the use and decoration effect are allowed on the front and back sides.
- The dimensional deviation between length and width shall not exceed ± 2 mm, and the thickness deviation shall not exceed ± 0.3 mm.
- The verticality deviation shall not exceed 1 mm/m, and the edge right angle deviation shall not exceed 1 mm/m.
- The warpage with a thickness of 3 mm-12 mm shall not exceed 0.5%; The warping degree for thicknesses greater than 12 mm shall not exceed 0.3%.
The density of the 15 boards is 690-800kg/m3.
- The water absorption expansion rate is ≤ 8.0%;
- Moisture content: 3.0-10.0%
18 Static bending strength: thickness ≤ 13mm ≥ 22.0MPa; Thickness>13-20 mm ≥ 20.0MPa; Thickness>20-25 mm ≥ 18.0MPa; Thickness 25>mm ≥ 17.0 MPa.
19 Inner bonding strength: thickness ≤ 13mm ≥ 0.55MPa; Thickness>13-20 mm ≥ 0.45MPa; Thickness>20-25 mm ≥ 0.45MPa; Thickness 25>mm ≥ 0.45MPa.
The grip force of 20 screws (on the board surface) is ≥ 1000N.
- Surface resistance to cold and hot cycles: no cracks or bubbles.
22 Surface scratch resistance: ≥ 1.5N, with no continuous scratches on the surface.
23 Surface * * *: ⑴ Wear value: ≤ 80 (mg/100r) ⑵ Surface pattern condition: After grinding for 100 r, more than 50% of the pattern should be retained. ⑶ Surface plain color condition: After grinding for 150 r, there should be no bottom exposure.
- Surface resistance to dry heat: no cracking or blistering.
25 Formaldehyde release (Climate box method E1): ≤ 0.12 mg/m3.
The above is the testing standards for melamine paper introduced to everyone
