QB/T 1924-1993Kitchen knifes (English PDF)

4.5 Roughness

4.5.1 If the main body of the blade is carbon steel, its roughness is Ralpha3.2 µm.

4.5.2 If the main body of the blade is stainless steel, its roughness is Ralpha1.6 µm.

4.6 The blade is straight and symmetrical, except for special design requirements.

4.7 The cumulative length of polished coarse wire and black wire, which is less than 10 mm, on the knife body, shall not exceed 50 mm. The number of pits, which is less than 1 mm2, shall not exceed 5.

4.8 Knife handle, knife hoop, washers

4.8.1 There is no looseness or deformation, after the end of the knife handle

bears a radial tension of 80 N. Knife hoop and washers shall be assembled tightly, firm, straight.

4.8.2 There shall be no pores or sand holes in the welding place, between the metal handle and the knife body; there is no water leakage; the welding shall be flat and smooth.

4.8.3 There is no looseness or deformation of the plastic knife handle, after the temperature resistance test.

4.9 The trademark shall be clear and upright.

4.10 See Appendix A (Supplementary) for the quality grading requirements of kitchen knives.

5.2 Sharpness. Use a kitchen knife sharpness tester to test; measure one point

at each of the front and rear 1/3 of the blade.

5.3 Hardness test. Use a hardness tester, to measure one point, each at the front, middle, back within 5 ~ 8 mm from the cutting edge line.

5.4 The metallographic organization is examined by a metallographic microscope (500X). The observation position is on the middle cross section of the blade length, 3 ~ 10 mm away from the cutting edge.

5.5 Quenching width and apparent steel and partial steel test. Coat 5% nitric

acid solution on the cutting edge of the knife head and root, respectively, to observe the color; measure it visually and with a ruler.

5.6 Roughness test. Use a roughness tester OR compare with roughness

samples. Use instrument measurement as the arbitration method.

5.7 Thick wire, black wire, pitting is measured by template or ruler.

5.8 Knife handle's strength test. Use the knife hoop as the fulcrum and the back

as the bottom surface. Use the hanging weight method, at 10 mm on the tail end of the knife handle.

5.9 Temperature resistance test of plastic knife handle. The plastic knife handle

is immersed in water at 100 °C for 15 minutes.

5.10 For other technical requirements, use visual inspection and hand feel inspection.

6.2.1 Exit-factory inspection

It is performed according to the provisions of GB 2828.Use one sampling plan of normal inspection. Carry out calculation based on the number of unqualified products per 100 units. The inspection items, nonconformance classification, inspection level, acceptance quality level shall meet the requirements of Table 4.

factory inspection. It is first re-inspected, according to the exit-factory inspection items. After the re-inspection is qualified, carry out the type inspection.

6.3 If it fails in the inspection, it shall double the quantity for re-inspection. If it

still fails in the re-inspection, the batch of products shall be judged as unqualified.

6.4 It is allowed for both parties to negotiate and adopt other inspection rules.

7.1 Marking

There shall be a permanent trademark on the product.

7.2 Packaging

7.2.1 Each knife shall be packed in paper bag or plastic bag; it is accompanied

with product description, manufacturer name, qualification mark.

7.2.2 The packing box shall indicate.

a. Product name, specification, grade;

b. The name and address of the manufacturer;

c. Date of manufacture and date of exit-factory;

d. Quantity;

e. Gross weight or net weight, kg;

f. Volume. length x width x height, cm3;

g. Moisture-proof mark.

7.2.3 Export packaging will be determined separately.

7.3 Transportation

Throwing, rain, and moisture shall be strictly prohibited during transportation.

7.4 Storage

The product shall be stored in a ventilated, dry warehouse, which has a relative humidity of no more than 80%. The product shall be more than 150 mm above the ground. In the absence of acid, alkali or other corrosive gases, the product will have a rust prevention period of 6 from the date of exit-factory.