1 . Purpose and scope of application
Stationery Products refer to cultural learning tools and basic aids for day-to-day work-learning management. Stationery Products are closely related to our lives, work and learning. It includes stationery supplies for office, Stationery Supplies For School, kid's stationery supplies, etc.. Stationery products such as pens, paper, stamps, pen holders, Plastic Storage Boxes, etc. are used in life, study, and work. The main materials for stationery products are also varied, such as wood, plastic, PVC, paper and so on.
If our customers have personalized customization requirements for stationery products, our technical team can provide them.
stationery supplies for school
Stationery Products Stationery Products,General Stationery Supplies,Stationery Office Supplies,Stationery Box Set Triple C International (Shenzhen) Co.,Ltd. , https://www.CCC-Triple.com
Ensure that medium density fiberboard meets process and quality requirements.
Applicable to the inspection of purchased fiberboard.
2 . Reference Standard
GB11718.1 Medium Density Fiberboard Definition and Classification
GB11718.2 medium density fiberboard technical requirements and inspection rules
3 . the term
3 . 1 medium density fiberboard
Wood fiber or other vegetable fiber is used as a raw material, and a urea resin or other suitable adhesive is applied to form a sheet having a density of 0.5"0.88 g/cm3 .
3 . 2 partial soft
Partial looseness due to poor paving or poor bonding.
3 . 3 corner defects
A defect caused by damage to the corners or edges of the board.
4 . classification
Divided into three types according to density, see Table 1 .
5 . skills requirement
5 . 1 rating
The products are divided into three grades: special grade, first grade and second grade.
5 . 2 specifications and deviations
5 . 2 . 1 thickness specification and its dimensional deviation
5 . 2 . 1 . 1 Thickness specifications are: 6 , ( 8 ), 9 , 12 , 15 , ( 16 ), 18 , ( 19 ), 21 , 24 , ( 25 ) mm, etc.
5 . 2 . 1 . 2 The thickness dimension deviation shall not exceed the requirements of Table 2 .
5 . 2 . 2 format specifications and dimensional deviation
The deviation of the size of the web shall not exceed the requirements of Table 3 .
5 . 2 . 3 diagonal deviation
The difference between the lengths of the two diagonals must not exceed 6 mm .
5 . 2 . 4 edge is not straight
No more than 1mm per 1000mm length .
5 . 2 . 5 warpage
The warpage shall not exceed the requirements of Table 4 .
5 . 3 surface appearance quality
The surface appearance quality shall comply with the requirements of Table 5 , and the defects within the deviation band shall not be counted.
6 . Testing method
6 . 1 sampling
Extracted proportionally based on the amount of feed.
6 . 2 measuring moisture content
The moisture content should be 4% "13%" measured using an instrument .
6 . 3 inspection procedures
6 . 3 . 1 thickness size inspection
Vernier caliper with an accuracy of 0.05mm, the four sides of the calibration plate at an intermediate inwardly of corners and four sides 25mm 25mm co inwardly 8, which is the arithmetic mean of the thickness to the nearest 0.1mm.
6 . 3 . 2 size measurement
The length is on both sides of the width of the board, and the width is measured on the two sides of the board with a steel tape measure to the nearest 1 mm .
6 . 3 . 3 diagonal length inspection
Use a steel tape measure to check the diagonal length of the plate to the nearest 1 mm .
6 . 3 . 4 edge non-straightness check
Use a ruler with a length of 1000mm to close the edge of the board and check the maximum deviation of the edge of the board from the ruler to the nearest 1mm .
6 . 3 . 5 warpage measurement
Place the concave side of the plate on the water platform and place it on the concave surface of the plate with a 1000mm long ruler edge. Check the maximum chord height for the warp to 1mm .
