LY/T 2222-2020Bamboo veneer (English PDF)

5.1 Classification

When finished bamboo veneer products meet the requirements of this standard in terms of specifications, dimensions, deviations and other physical and chemical properties, they are classified as excellent according to their appearance and quality.

Equal and qualified products.

5.2 Specifications and deviations

5.2.1 Thickness, width and length specifications and deviations

Should meet the requirements of Table 1.

5.2.2 Diagonal size and deviation

Should meet the requirements of Table 2.

5.4.2 Formaldehyde release

Should meet the requirements of GB 18580.Uncoated peeling bamboo veneer Except for.

6.1 Specifications and deviations

6.1.1 Measuring tools.

Micrometer, the graduation value is 0.01 mm;

Steel tape with a graduation of 1.0 mm.

6.1.2 Length and width

According to the provisions of GB/T 19367-2009 in 8.2.

6.1.3 Thickness

According to the provisions of GB/T 19367-2009 in 8.1, the bamboo joints should be avoided.

6.1.4 Diagonal difference

Measure the diagonal length of the veneer with a steel tape, and calculate the absolute value of the difference between the two diagonals to the nearest 1 mm.

6.2 Appearance quality

6.2.1 Through visual inspection or measuring tool inspection one by one, determine its grade according to the provisions of Table 3.

6.2.2 Defect measurement. measure the number of defects on the surface of the bamboo veneer with meters as the unit of measurement, and use the measured number of defects as the length and surface of the board the number of defects.

6.3 Physical and chemical properties

6.3.1 Sampling and test pieces

The distribution of the sample in the sample and the configuration of the test piece are shown in Figure 1 and Figure 2.The sample is distributed according to Figure 1 to prepare 3 samples, and then according to the figure 2 shows the test pieces with moisture content on each sample. If the sample width is not enough, samples can be prepared separately from several samples in the same batch.

Several samples of the same batch can also be spliced together in the same direction. When intercepting samples and test pieces, avoid material defects that affect the accuracy of the test.

Sinks and processing defects, and keep the surface of the test piece clean. When there is a defect in the specified place for taking the test piece, the preparation position of the test piece can be moved appropriately.

Unit is mm

6.3.2 Water content

According to the provisions of 4.3 in GB/T 17657-2013.

6.3.3 Formaldehyde emission

According to the provisions of GB/T 18580.

7.1 Inspection classification

Product inspection is divided into factory inspection and type inspection.

7.2 Factory inspection

The factory inspection includes the following items.

Standard sizes;

Appearance Quality;

Water content in physical and chemical properties.

7.3 Type inspection

Type inspection includes all inspection items specified in this standard. During normal production, the type inspection shall not be less than once every six months.

In one case, type inspection should be carried out.

When the raw and auxiliary materials and production process undergo major changes;

When production resumes after a long-term shutdown;

When the market supervision agency requests for type inspection.

7.2 Sampling plan and determination rules

7.2.1 Specification and size inspection

7.2.1.1 Sampling plan

The inspection of thickness, width, length and diagonal difference adopts the general inspection level I and acceptance quality limit (AQL) in GB/T 2828.1-2012 it is the secondary sampling of 6.5 normal inspection, and the sampling plan is shown in Table 5.

7.2.1.2 Judgment rules

For thickness, width, length, and diagonal difference, the number of samples for the first inspection should be equal to the number of samples given in the plan. According to Table 1,

Table 2 requires judgment. If the number of unqualified products found in the first sample is less than or equal to the first acceptance number, the batch of products should be considered acceptable.

To receive. If the number of nonconforming products found in the first sample is greater than or equal to the first rejected number, the batch of products should be considered unacceptable.

If the number of nonconforming products found in the first sample is between the first acceptance number and the first rejection number, a second sample should be taken. If tired If the number of unqualified products found in the first and second samples is less than or equal to the second acceptance number, it is determined that the batch of products is acceptable. in case If the cumulative number of unqualified products is greater than or equal to the second rejected number, the batch of products is determined to be unacceptable.

7.2.2 Appearance quality inspection

7.2.2.1 Sampling plan

Appearance quality inspection adopts the general inspection level II in GB/T 2828.1-2012 and the normal inspection II with an acceptance quality limit (AQL) of 4.0 Sub-sampling, the sampling plan is shown in Table 6.When multiple defects exist on a board at the same time, the defect that affects the product level is judged.

7.2.2.2 Judgment rules

The sample size for the first inspection should be equal to the first sample size given in the plan. If the number of nonconforming products found in the first sample is less than or equal to the first acceptance number, the batch of products should be considered acceptable. If the number of nonconforming products found in the first sample is greater than or equal to the first for a rejected number, the batch of products shall be considered unacceptable.

If the number of nonconforming products found in the first sample is between the first acceptance number and the first rejection number, a second sample should be taken. If tired If the number of unqualified products found in the first and second samples is less than or equal to the second acceptance number, it is determined that the batch of products is acceptable. in case If the cumulative number of unqualified products is greater than or equal to the second rejected number, the batch of products is determined to be unacceptable.

7.2.3 Physical and chemical performance inspection

7.2.3.1 Sampling plan

Samples are randomly selected from the batch submitted for inspection. The sampling plan is shown in Table 7.Items that fail the first sampling inspection are allowed to be in the same batch.

Double the sampling re-inspection of the secondary products, and the re-inspection is divided into two groups.

7.2.3.2 Judgment rules

When the moisture content and formaldehyde emission meet the requirements, it is qualified; otherwise, the unqualified items should be doubled for sampling and re-inspection. When the re-inspection is qualified, the physical and chemical properties of this batch of products are judged as qualified, otherwise it is judged as unqualified.

7.3 Comprehensive judgment

The three inspection results of product specifications and dimensions, appearance quality, and physical and chemical properties meet the technical requirements of the corresponding level, and the batch of products is determined to be Qualified products, otherwise judged as unqualified products.

8.1 Packaging

8.1.1 The bamboo veneers are packaged in bundles according to grade, specification and quantity. After the plastic film is sealed, it is put into a cardboard box.

It is firm and level to avoid damage to the bamboo veneer.

8.1.2 Bundles of bamboo veneers are packaged into large packages according to different grades, thicknesses and specifications. The packaging should be based on storage and transportation needs and the moisture content of bamboo veneers Take corresponding measures to prevent moisture, mildew and corrosion. The upper and lower parts of the bale are made of corrugated plywood (sawn timber or artificial board and other hard Packing materials) clamped, and then packed with steel or plastic belts, etc. The packaging should be firm to avoid damage. After packing, it should be stacked 10 cm above the ground Store indoors above the wooden frame foundation. The storage place should be ventilated and dry. Packaging requirements can also be negotiated between the supplier and the buyer.

8.2 Sign

8.2.1 The surface of each bundle of bamboo veneers shall have the number, specification, type, grade, quantity and other signs of the bamboo veneer, and the signs must be clear.

8.2.2 There should be a sign on each large package, indicating the product name, standard number, category, thickness, grade, trademark, name of the manufacturer, and location.

Address and other content.

8.2.3 There should be transportation and moisture-proof marks on the big bag.

8.3 Transportation and storage

The product should be protected from rain, moisture, sun and deformation during transportation and storage.