LY/T 3226-2020Oriented strand board for container flooring (English PDF)

4.1 Specification size, size deviation and density deviation

4.1.1 Common format specifications. 1200mm×2400mm, 1220mm×2440 mm. It can also be produced according to the agreement between the supplier and the demander Produce.

4.1.2 Thickness specifications. 14mm, 15mm, 16mm, 18mm, 20mm, 22mm, 24mm. Can also double according to supply and demand Party agreed to produce.

4.1.3 Product size deviation and density deviation should meet the requirements of Table 1.

4.2 Appearance quality

The appearance quality should meet the requirements of Table 2.

4.3 Physical and mechanical properties

The physical and mechanical properties should meet the requirements of Table 3.

5.1 Apparatus

5.1.1 Micrometer, the graduation value is 0.01mm.

5.1.2 Vernier caliper, graduation value 0.02mm.

5.1.3 Steel tape, with an graduation value of 1.0mm.

5.1.4 Balance with a sense of 0.01g.

5.2 Sampling and test pieces

5.2.1 Take samples as specified in Section 7.

5.2.2 Saw three samples according to the sample in Figure 1, and indicate the sample number, the position of the upper and lower surfaces and the edge of the board. Each sample According to Figure 2 and Table 4, saw the test piece.

Note. In the figure, L represents the length of the sample, and B represents the width of the sample.

5.3 Measurement of dimensional deviation

According to the relevant regulations in GB/T 19367-2009.

5.4 Edge straightness determination

According to the relevant regulations in GB/T 19367-2009.

5.5 Measurement of verticality

According to the relevant regulations in GB/T 19367-2009.

5.6 Determination of moisture content

According to the provisions of 4.3 in GB/T 17657-2013.The test piece does not need to be balanced.

5.7 Density determination

According to the provisions of 4.2 in GB/T 17657-2013.The test piece does not need to be balanced.

5.8 Determination of static bending strength and elastic modulus

According to the provisions of GB/T 17657-2013, 4.7.The test piece does not need to be balanced.

5.9 Determination of internal bond strength

According to the provisions of 4.11 in GB/T 17657-2013.The test piece does not need to be balanced.

5.10 24 hours water absorption thickness swelling rate measurement According to the provisions of 4.4 in GB/T 17657-2013.The test piece does not need to be balanced.

5.11 Determination of internal bonding strength after boiling

According to the provisions of 4.12 in GB/T 17657-2013.The test piece does not need to be balanced.

5.12 Short-span shear strength determination

Determine the short-span shear strength according to the method in Appendix A. The test piece does not need to be balanced.

6.1 Result calculation

6.1.1 Average

The average value of a board is the arithmetic average of the test values of n test pieces in the board, calculated according to formula (2).

6.1.2 Find the minimum value among several test pieces of a plate (static bending strength, internal bonding strength, elastic modulus, short span shear strength (Longitudinal)) or maximum value (24 hours water absorption thickness expansion rate).

6.2 Judgment method

6.2.1 The average value of static bending strength, internal bonding strength and elastic modulus, and short span shear strength (longitudinal) of a board must meet.

6.2.2 The arithmetic average of the water absorption thickness expansion rate of a board must meet.

6.2.3 When inspecting multiple boards, each board should meet the requirements of 6.2.1 and 6.2.2, if not, re-inspect according to Article 7.3.1 and judgment.

6.2.4 For other performance indicators that are not specified, only their arithmetic average values are judged.

7.1 Inspection classification

Product inspection is divided into factory inspection and type inspection.

7.1.1 The factory inspection includes the following items.

a) Appearance quality;

b) Specifications and dimensions;

c) Physical and mechanical properties. density deviation, moisture content, water absorption thickness expansion rate, static bending strength, elastic modulus, internal bonding Strength, short span shear strength.

7.1.2 Type inspection is all inspection items required in Chapter 4.

During normal production, the type inspection shall not be less than once every six months; when one of the following situations occurs, the type inspection shall be carried out.

a) When there are major changes in raw and auxiliary materials and production processes;

b) When production has been suspended for more than three months and production is resumed;

c) When the quality supervision department proposes type inspection requirements.

7.2 Dimensions

The general inspection level in GB/T 2828.1-2012 is II and the acceptance quality limit (AQL) is 4.0.

Case, see Table 5.

7.3 Physical and mechanical properties

7.3.1 The physical and mechanical properties shall adopt the re-inspection sampling plan according to Table 6.Take n1 boards for the first time, if an indicator in the test result is not Qualified, then take n2 plates for the second time to re-inspect the unqualified items, and the performance value of the second sample n2 (the unqualified items in n1) must all meet the standard requirements, otherwise the batch of products will be judged as unqualified.

7.3.2 When the factory conducts self-inspection on the physical and mechanical properties of the boards, the number of samples can be 1 per shift.

7.4 Judgment rules

When all inspection items are qualified, the batch of products is determined to be a qualified batch, otherwise it is unqualified.

8.1 Identification

The product shall be affixed with a mark indicating the product name, specifications, production date and inspector code.

8.2 Packaging

Products should be properly packaged according to different specifications. Each package should be accompanied by the product name, manufacturer's name, trademark, regulations Grid size, quantity, implementation standard, moisture-proof and inspection label with qualified seal.

8.3 Transportation and storage

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

Appendix A

(Normative appendix) Short span shear strength measurement method A.1 Test instruments and equipment A1.1 Mechanics universal testing machine, the graduation value is 10N;

A1.2 Vernier caliper, graduation value 0.02mm;

A1.3 Micrometer, the graduation value is 0.01mm.

A.2 Test procedure

A.2.1 Record the length, width and thickness of the test piece (accurate to 0.1mm).

A.2.2 Adjust the span between the two supports to 10 times the nominal thickness of the test piece, and determine the short span shear strength as shown in Figure A.1.

A.2.2.1 The axis of the loading roller should be parallel to the axis of the support roller;

A.2.2.2 The diameter of the end face of the loading roller is (30±0.5) mm, and the diameter of the supporting roller is (15±0.5) mm;

A.2.2.3 The length of the loading roller and the supporting roller should be greater than the width of the test piece;

A.2.2.4 The axis of the loading roller must be perpendicular to the centerline of the long axis of the test piece, and the load should be evenly loaded. The loading speed is 2.0mm/min.

Until the specimen is broken, record the maximum breaking load, accurate to 10N.