LY/T 3198-2020Binderless bamboo chopping board (English PDF)

5.1 Raw material requirements

5.1.1 The bamboo is generally 4 to 6 years old raw bamboo.

5.1.2 The additives used in the production of glue-free bamboo cutting boards shall meet the requirements of the national standard GB 9685.

5.2 Product grade

The products are divided into two grades of superior products and qualified products according to the appearance quality requirements.

5.3 Sensory requirements

5.3.1 Odor

The smell is required to be free of musty and other obvious peculiar smells.

5.3.2 Appearance quality requirements

Note. Not obvious-Normal vision is 400mm away from the surface of the non-glue bamboo cutting board under natural light, which is not easy to distinguish by naked eye observation.

5.4 Specification size and deviation, shape error

5.4.1 Specifications and deviations

Should meet the requirements of Table 2.

5.4.2 Shape error

Should meet the requirements of Table 3.

5.6 Limits of hazardous chemical substances

The limit of hazardous chemical substances shall comply with the regulations in Table 5.

6.1 Sensory inspection

6.1.1 Odor

At a distance of 50mm from the surface of the non-glue bamboo cutting board, sniff the samples and inspect them as required.

6.1.2 Appearance quality requirements

Perform visual inspection on the samples as required. When using visual inspection, it should be approximately within the range of natural light or illuminance from 300lx to 600lx Under natural light (such as 40W fluorescent lamp), the viewing distance is 400mm~500mm.

6.2 Inspection of size, deviation and shape error

6.2.1 Measuring tools

The measuring tools and specifications used are as follows.

--Vernier caliper, the graduation value is 1.0mm, and the accuracy is 0.02mm.

--Feel gauge, accuracy level 1.

--Steel tape, 3m long, graduation value 1.0mm, accuracy 1.0mm.

--Steel ruler, graduation value is 0.5mm, precision is 0.5mm.

6.2.2 Length, width, thickness, diameter

6.2.2.1 Length (l) and width (w)

Choose 3 measuring points within 20mm from the edge of the bamboo cutting board, measure with a steel tape or steel ruler, and take the minimum of all the measured values as the measurement the test result is accurate to 1.0mm.

6.2.2.2 Thickness (t)

At the four corners of the rectangular bamboo cutting board and the middle of each side; on the circumference of the circular bamboo cutting board, select a total of 8 points, measure with a vernier caliper, and take the There is the minimum value of the measured value as the test result, accurate to 0.1mm.

6.2.2.3 Diameter (d)

Select a total of 3 points on the bamboo part of the circular bamboo cutting board, pass the center of the circle, and measure with a steel tape or a steel ruler, whichever is the smallest the value is used as the test result, accurate to 1.0mm.

Note. For bamboo cutting boards that have not been painted (painted), the amount of heavy metal migration may not be tested.

6.2.2.4 Warpage (f)

Place the bamboo cutting board on the surface of the water platform, and connect the side of the steel ruler (close to) any diagonal (diameter) of any use surface of the bamboo cutting board, Use a feeler gauge to measure the maximum chord height (accurate to 0.01mm). The ratio of the maximum chord height to the diagonal length (diameter) is the warpage. Take all samples to measure the maximum value of the value is used as the test result, expressed as a percentage, accurate to 0.01%.

6.3 Physical and mechanical properties and limit inspection of hazardous chemical substances

6.3.1 Sample preparation

6.3.1.1 It should be taken from a position at least 20 mm away from the edge of the sample.

6.3.1.2 Sampling can be based on the shape and structure of the product, and the sampling method can be determined after analysis and indicated in the inspection report.

6.3.1.3 Specimen specifications, quantity, and preparation requirements.

Should meet the requirements of Table 6.

6.3.2 Water content

According to the provisions of 4.3 in GB/T 17657-2013.The moisture content is the arithmetic average of the moisture content of the three tested samples.

6.3.3 Splicing quality

6.3.3.1 Hoop type non-glue bamboo cutting board

Test separately according to wet state and dry state.

a) Wet state. Take three samples and completely immerse the whole bamboo cutting board in water (the liquid level is more than 2mm above the board surface), according to the requirements in Table 4 After operation, check whether the fastener is broken and measure the degree of warpage.

b) Dry state. Take three samples and operate according to the requirements in Table 4 to check whether the fasteners are loose; use a feeler gauge to measure the seam separation and record;

Visually inspect the pores and count them.

6.3.3.2 Clamping non-glue bamboo cutting board

Test separately according to wet state and dry state.

a) Wet state. Take three samples and completely immerse the whole bamboo cutting board in water (the liquid level is more than 2mm above the board surface), and operate according to Table 4 After completion, check whether the fastener is broken or slippery; visually check whether there is a crack on the board surface or near the threaded hole.

b) Dry state. Take three samples and operate according to Table 4 to check whether the fasteners are loose; use a feeler gauge to measure the seam separation and record.

6.3.4 Handle firmness

6.3.4.1 Adopt the method of hanging from the code to detect, repeat three times.

6.3.4.2 Method

Fix the glue-free cutting board vertically on the fixed frame, the handle part is vertically downward, and the distance from the ground is about 1m. Choose the code and follow the glue-free bamboo cutting board the weight of 5 times the net weight is used to determine the weight of the law code. Hang the law code with a string on the handle, and the static load is 5 minutes.

6.3.5 Impact resistance of use surface

6.3.5.1 Use the falling ball impact method to test, repeat three times.

6.3.5.2 Method

6.3.6 Migration of sulfur dioxide

According to the provisions of GB 31604.32.

6.3.7 Residual amount of oxidant

6.3.8 Principle

Under acidic conditions, oxidant residues and potassium iodide will generate iodine. The produced iodine is titrated with sodium thiosulfate standard solution, and starch is used as the Indicator, the color of the solution fades from blue to colorless as the end point of the titration. Record the volume of the sodium thiosulfate standard solution consumed by the titration and use the formula Calculate the residual amount of oxidant.

6.3.8.1 Reagents

The reagents used are as follows.

a) Sulfuric acid solution (1 3). Take 1 volume of concentrated sulfuric acid and slowly inject 3 volumes of water.

b) Potassium sulfide solution. 50g/L, prepared during use.

c) 0.02mol/L sodium thiosulfate standard solution. Prepare and calibrate 0.1mol/L sodium thiosulfate standard solution according to GB/T 601, just before use.

d) 5g/L starch solution. Weigh 0.5g starch, add 5mL water to make it into a paste, add the paste to 50mL boiling water under stirring, Boil for 1min~2min, cool and dilute to 100mL. The use period is two weeks.

e) Acetic acid solution (11). Mix 1 volume of glacial acetic acid with 1 volume of water.

6.3.8.2 Method

Take 20g samples as a group and do two parallel tests. Into a 500mL stoppered iodine flask, add 25mL potassium iodide solution and 5mL sequentially Sulfuric acid solution, 0.5mL starch solution, 5mL acetic acid solution,.200mL distilled water, and then put each group of samples into an iodine measuring flask, screw the flask tightly Stopper, shake for 0.5h. Titrate the solution in the iodine flask with 0.02mol/L sodium thiosulfate standard solution. The color of the solution fades from blue to colorless, and 30s the color does not change as the titration end point. Record the volume of sodium thiosulfate standard solution consumed.

Carry out a blank test at the same time, the operation is the same as above. Record the volume of sodium thiosulfate standard solution consumed.

6.3.8.3 Results

6.3.9 Arsenic (As) migration

The determination of arsenic (As) migration is carried out in accordance with the regulations of GB 31604.38.

6.3.10 Migration of heavy metals

The measurement of lead (Pb) migration is carried out in accordance with the provisions of GB 31604.34.The measurement of cadmium (Cd) migration is carried out in accordance with the provisions of GB 31604.24 Row.

7.1 Inspection classification

Product inspection is divided into factory inspection and type inspection.

7.2 Factory inspection

Each batch of products shall undergo factory inspection, which shall be carried out on the premise of passing the type inspection. The factory inspection includes the following items.

a) Sensory inspection;

b) Inspection of size, deviation and shape error;

c) In the physical and mechanical performance test items, the moisture content, the impact resistance of the service surface, and the firmness of the handle are included.

7.3 Type inspection

7.3.1 Type inspection is all clauses in the technical requirements.

7.3.2 Normal production for one full year. In one of the following situations, type inspection shall be carried out.

a) Trial-type appraisal of new products or product transfer to factory production;

b) During formal production, such as when there are major changes in structure, raw materials, and processes;

c) When the product has been suspended for more than half a year, when production resumes;

d) When there is a big difference between the factory inspection result and the last type inspection result;

e) When the national market supervision and management agency puts forward a type inspection request.

7.4 Principles of group batching

Products with the same raw material variety, production conditions, specifications, and types are an inspection lot.

7.5 Sampling plan

7.5.1 Sensory requirements inspection sampling plan

7.5.1.1 In order to ensure that its finished products meet the standard requirements, the manufacturer determines its grade by inspecting the appearance quality requirements of glue-free bamboo cutting boards one by one.

7.5.1.2 When performing sensory inspection on the non-glue bamboo cutting boards allocated in batches, the normal inspection in GB/T 2828.1-2012 shall be used for the second sampling.

For the sample plan, the inspection level is II and the acceptance quality limit (AQL) is 6.5, which should meet the requirements of Table 7.

7.5.2 Sampling for size and deviation inspection

When inspecting specifications, dimensions and deviations, the normal inspection sub-sampling plan in GB/T 2828.1-2012 shall be adopted, and the inspection level shall be I.

The acceptance quality limit (AQL) is 10, which should meet the requirements of Table 8.

7.5.3 Sampling for physical and mechanical properties, limit inspection of hazardous chemical substances Samples are randomly selected from the submitted inspection batch. The sampling plan is shown in Table 9.Items that fail the first sampling test are allowed to be in the same batch.

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

7.6 Results judgment

7.6.1 Sensory requirements, specifications, dimensions, and deviation items are in compliance with the technical requirements of the corresponding category and level, and the batch of products is determined to be qualified or unqualified If it is still unqualified, the batch of products will be judged as unqualified products;

7.6.2 The physical and mechanical performance items are in compliance with the corresponding technical requirements, and the batch of products is determined to be qualified.

If unqualified, the batch of products shall be judged as substandard products;

7.6.3 If any one item (including one item) is unqualified in the limit of hazardous chemical substances, the batch of products shall be deemed unqualified.

8.1 Identification

8.1.1 Logo

The packaging, storage and transportation graphics shall be implemented in accordance with GB/T 191.

8.1.2 Label

The package should be marked with the name of the factory, the address, the name of the product, the specification, the quantity, the grade, the date of manufacture, the implementation standard, the main material composition, Use the surface and other signs, and place the instruction manual, inspection certificate, and other product signs can be stamped according to the supply and demand contract.

8.2 Packaging

8.2.1 The packaging should meet the requirements of firmness, cleanliness, moisture-proof and beautiful appearance.

8.2.2 The packaging materials should be dry, clean, free of peculiar smell, and should not affect product quality.

8.3 Transportation and storage

During transportation and storage, it must be protected from moisture, fire, packaging damage, pollution, and isolation from toxic, harmful and odorous items.