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GB/T 15036 consists of the following two parts under the general title Solid wood flooring:
——Part 1: Technical requirements;
——Part 2: Examination methods.
This is Part 2 of GB/T 15036.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 15036.2-2009 Solid wood flooring—Part 2: Examination methods The following main changes have been made with respect to GB/T 15036.2-2009:
——the appearance quality inspection requirements are specified (see 3.2);
——the preparation and detection methods of test pieces for paint film surface resistant to pollution are added (see 3.3.2.5);
——the test method of heavy metal content (limited to color paint) is added (see 3.3.2.6);
——the identification method of wood name is added (see 3.4);
——the sampling requirements in the examination methods are modified (see 4.2.1; 4.2.1 of Edition 2009);
——Annex A is deleted.
This part was proposed by the National Forestry and Grassland Administration.
This part is under the jurisdiction of National Technical Committee 41 on Timber of Standardization Administrator of China (SAC/TC 41).
The previous editions of this part are as follows:
——GB/T 15036.6-1994, GB/T 15036.2-2001 and GB/T 15036.2-2009.
Solid wood flooring—
Part 2: Examination methods
1 Scope
This part of GB/T 15036 specifies the examination methods and rules of solid wood flooring.
This part is applicable to the quality inspection and evaluation in the production, sales and circulation of solid wood flooring.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated reference, the latest edition of the referenced document (including any amendments) applies.
GB/T 2828.1-2012 Sampling procedures for inspection by attributes—Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
GB/T 4823-2013 Defects in sawn timber
GB/T 4893.4-2013 Test of surface coatings of furniture—Part 4: Determination of adhesion—Cross cut
GB/T 6739-2006 Paints and varnishes—Determination of film hardness by pencil test
GB/T 15036.1-2018 Solid wood flooring—Part 1: Technical requirements
GB/T 17657-2013 Test methods of evaluating the properties of wood-based panels and surface decorated wood-based panels
GB 18584 Indoor decorating and refurbishing materials—Limit of harmful substances of wood based furniture
GB/T 29894-2013 General method of wood identification
JB/T 3889-2006 Coated abrasives—Abrasive cloth
3 Examination methods
3.1 Specifications and dimensions
3.1.1 Measuring tools
3.1.1.1 Steel tap with a precision of 1 mm.
3.1.1.2 Steel ruler with a precision of 1 mm.
3.1.1.3 Vernier caliper with a precision of 0.02 mm.
3.1.1.4 Micrometer with a precision of 0.01 mm.
3.1.1.5 Feeler gauge with a precision of 0.01 mm.
3.1.2 Length (l)
The length (l) is measured with a steel tape or steel ruler at 20 mm from the two long sides of the flooring, with the value accurate to 1 mm, as shown in Figure 1.
Dimensions in millimeters
Figure 1 Drawing for length (l) measurement
3.1.3 Width (w)
The width (w) is measured with a vernier caliper at 20 mm from both ends of the flooring and at the long center of the flooring, with the value accurate to 0.02 mm, as shown in Figure 2.
Dimensions in millimeters
Figure 2 Drawing for width (w) measurement
3.1.4 Thickness (t)
The thickness (t) is measured with a micrometer at the place where the four corners of the flooring are 20 mm away from the long side and the end side respectively, and at the place where the midpoint of the long side of the flooring is 20 mm away from the long side, with the value accurate to 0.01 mm, as shown in Figure 3.
Dimensions in millimeters
Figure 3 Drawing for thickness (t) measurement
3.1.5 Tongue width (w1)
The tongue width (w1) is measured with a vernier caliper at 20 mm from both ends of the flooring, with the value accurate to 0.02 mm, as shown in Figure 4.
Dimensions in millimeters
Figure 4 Drawing for tongue measurement
The tongue width is calculated using Equation (1):
w1＝w0－w (1)
where:
w1——the tongue width, mm;
w0——the measured width including tongue, mm;
w——the measured width of the flooring, mm.
3.1.6 Warpage (f)
Put the flooring on the horizontal test bed with its concave side upside, place the steel ruler vertically against the two long sides of flooring and measure the maximum chord height cmax with the feeler gauge, with the value accurate to 0.01 mm. The ratio of the maximum chord height to the measured width is the warpage fw in the width direction, expressed as a percentage, with the value accurate to 0.01%, and measured at any corresponding point on the long side. See Figure 5. Put the flooring on the horizontal test bed laterally along the length, place the steel ruler or steel wire rope vertically against both ends of flooring and measure the maximum chord height hmax with a feeler gauge, with the value accurate to 0.01 mm; the ratio of the maximum chord height to the measured width is the warpage fl in the length direction, expressed as a percentage, with the value accurate to 0.01%, and measured at any corresponding point on the end edge. See Figure 6.
Figure 5 Drawing for measurement of warpage (fw) in width direction
Figure 6 Drawing for measurement of warpage (fl) in length direction
3.1.7 Assembled gap (o) and assembled high difference (h1)
Assemble 10 pieces of flooring tightly as specified in Figure 7, place them on the horizontal test bed and then measure with the feeler gauge the maximum value of assembled gap (o) and assembled high difference (h1) of 18 points shown in Figure 7, with the value accurate to 0.01 mm.
Figure 7 Drawing for measurement of assembled gap and assembled high difference
3.2 Appearance quality
3.2.1 The height of the inspection bench shall be about 700 mm.
3.2.2 Three fluorescent tubes (40 W) with a spacing of about 400 mm shall be adopted as the lighting source. The tubes shall be parallel to the board in terms of their length directions. The tubes shall be about 2 m from the inspection bench, and natural light shall not affect the inspection.
3.2.3 The vision of the inspector shall be normal. The samples shall be inspected one by one, with a sight distance of 0.5 m-1.5 m and a viewing angle of 30°-90°.
3.2.4 The inspection shall be carried out according to the provisions of GB/T 4823-2013, and the product grade shall be determined according to the requirements of Table 4 of GB/T 15036.1-2018.
3.3 Physical and chemical properties
3.3.1 Requirements on preparation, size and quantity of test pieces
3.3.1.1 Preparation position, dimension specifications and quantity of the test pieces shall comply with those specified in Figure 8 and Table 1. When the size of the flooring is too small to meet the requirements of the size and quantity of test pieces, continue to take samples at random until all the required test pieces can be cut.
