QB/T 2540-2023 PDF English
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QB/T 2540: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| QB/T 2540-2023 | 275 | Add to Cart | Auto, 9 seconds. | Leather bracelets | Valid |
| QB/T 2540-2013 | 479 | Add to Cart | 3 days | Leather bracelets | Obsolete |
| QB/T 2540-2002 | 319 | Add to Cart | 3 days | Leather bracelets | Obsolete |
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QB/T 2540-2023: Leather bracelets
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QBT2540-2023QB LIGHT INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 39.040.10 CCS Y 11 QB/T 2540-2023 Replacing QB/T 2540-2013 Leather bracelets 皮革表带 Issued on: APRIL 21, 2023 Implemented on: NOVEMBER 01, 2023 Issued by. Ministry of Industry and Information Technology of the People's Republic of China.
Table of Contents
Foreword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 6 4 Requirements... 6 5 Test methods... 12 6 Inspection rules... 17 7 Marks, packaging, transportation, storage... 20 Annex A (informative) Names and CAS numbers of 24 harmful aromatic amines... 22 Leather bracelets1 Scope
This document specifies the requirements for leather bracelets (hereinafter referred to as "bracelets") and describes the corresponding test methods. It specifies the inspection rules, marks, packaging, transportation, and storage contents. This document applies to the production, inspection, and sale of bracelets made from various natural leather and synthetic leather materials. For the production, inspection, and sales of bracelets made of other materials, refer to this document.2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2828.1, Sampling procedures for inspection by attributes -- Part 1.Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 2829, Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability) GB/T 4048, Timekeeping instruments -- Wristwatches -- Dimensions of bracelet-to- case fastening elements GB/T 10111, Generation of random numbers and procedures applied to sampling inspection for product quality GB/T 19941.1, Leather and fur -- Determination of formaldehyde content -- Part 1. High performance liquid chromatography method GB/T 19941.2, Leather and fur -- Determination of formaldehyde content -- Part 2. Colorimetric method GB/T 19942, Leather and fur -- Chemical tests -- Determination of banned azo colorants GB/T 22808, Leather and fur -- Chemical tests -- Determination of chlorinated phenols content GB/T 22930.1, Leather and fur -- Chemical determination of metal content -- Part 1.Extractable metals GB/T 26125, Electrical and electronic products -- Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers) GB/T 38020.2-2019, Watchcases and accessories -- Gold alloy coverings -- Part 2. Determination of fineness, thickness, corrosion resistance and adhesion QB/T 2537, Leather -- Tests for colour fastness -- Colour fastness to cycles of to- and-fro rubbing QB/T 4781, Test conditions for appearance of watch casings QB/T 5175.3, Wear environmental test methods for watch casings -- Part 3.solar radiation test3 Terms and definitions
There are no terms or definitions that need to be defined in this document.4 Requirements
4.1 Size and limit deviation 4.1.1 Series and limit deviation of width dimensions of bracelet shaft hole end The width of the bracelet shaft hole end should comply with the size requirements in GB/T 4048.The size series and limit deviation shall comply with the provisions of Table 1. 4.1.2 Maximum deviation of bracelet length, thickness, and bracelet shaft hole diameter The shape of the bracelet should be straight, with a full, smooth, and natural curved surface, and a straight embedded core. The cutting and edging surfaces should be flat and smooth. The shape of the symmetrical part of the same bracelet should be basically consistent. 4.2.2 Bonding The adhesive parts of the bracelet and hoop should be firm, flat, and free from any glue peeling. 4.2.3 Surface quality 4.2.3.1 The bracelet fabric and hoop should not have defects such as damage, wrinkles, cracks, looseness, stains, adhesive marks, etc. The color, pattern, and luster of the same bracelet should be basically consistent. 4.2.3.2 The lining of the bracelet should not have any damage, wrinkles, cracks, stains, or other obvious defects. 4.2.4 Bracelet pivot hole The bracelet shaft hole should be smooth and unobstructed. There should be no residual glue or other foreign objects inside the hole. 4.3 Suture 4.3.1 Bracelet stitching density, stitch spacing, and limit deviation The bracelet stitching density, stitch spacing, and limit deviation should comply with the provisions of Table 4. 4.3.2 Stitch 4.3.2.1 The stitching on the bracelet should be uniform. There should be no floating lines, open lines, jumping stitches, or other phenomena. Suture turns should be natural, smooth, and symmetrical. 4.3.2.2 The starting and ending lines of the two lines of stitching should be parallel to the end line of the shaft hole. Its parallelism should not exceed 0.5 mm. 4.3.2.3 There should be no residual threads on the surface or inside of the bracelet. 4.4 Punching holes The punching hole surface of the bracelet should be neat and straight. The hole wall should be smooth. The deviation of the punching center from the centerline of the bracelet should not exceed 0.5 mm. 4.5 Label The bracelet label should be clear and upright. The edge of the label should be smooth and even. The deviation of the center line of the label from the center line of the bracelet should not exceed 0.5 mm. NOTE. If there are special requirements for the labeling position, it shall be determined through consultation between the supplier and the purchaser. 4.6 Tensile properties The tensile performance of the bracelet shaft hole end, bracelet body, and hoop should comply with the provisions of Table 5. 4.7 Tensile and torsional fatigue resistance performance After the tensile and torsional fatigue performance test of the bracelet, there should be no fracture or damage to the shaft hole end of the bracelet, and no fracture to the bracelet body. 4.8 Bending fatigue performance After the bending fatigue performance test of the bracelet, there should be no peeling, breakage, cracks, or glue peeling around the bending and punching areas. 4.9 Wear resistance After the wear resistance test, the bracelet should not show obvious discoloration, wear, or surface detachment. The felt on the test head should not show obvious staining. 4.10 Punching test After the punching test, there should be no peeling, cracking, or glue peeling around the punched bracelet. 4.11 Buckle test 4.11.1 The bracelet should pass smoothly through the buckle without any jamming. 4.11.2 After the buckle test, bracelets with stitch buckles should not show signs of wear or surface detachment. 4.12 Light resistance performance After the light resistance test, the surface of the bracelet should have no damage or significant color change. 4.13 Corrosion resistance After the corrosion resistance test, the surface of the bracelet should not have bubbles, delamination, or curling. 4.14 Combination test After the combination test, the bracelet should not exhibit phenomena such as peeling, cracking, discoloration, wrinkling, etc. 4.15 Limit of harmful substances The limit of harmful substances in bracelets should comply with the provisions of Table 6. The requirements, testing methods, and inspection rules for the limit of harmful substances shall be implemented in accordance with mandatory national standards if they are issued and implemented.5 Test methods
5.1 Instruments and equipment The resolution and maximum allowable error of test instruments and equipment shall comply with the provisions of Table 7. 5.2 Size and limit deviation Measure the width of the bracelet shaft hole end with a caliper. Visually inspect the number of punched holes. The punching spacing and punching aperture/width are measured using a projector. The length of the bracelet and the length of the fixed push ring extending from the end of the bracelet are measured with a steel ruler. Measure the thickness of the bracelet with a caliper at a distance of 20 mm from the end of the bracelet shaft hole. Measure the diameter of the bracelet shaft hole with a plug gauge. During measurement, the gauge should be smoothly inserted and removed from the shaft hole without any jamming. 5.3 Appearance Under the conditions specified in QB/T 4781, visually inspect the bracelet shape, adhesion, surface quality, and bracelet axis hole of the bracelet with normal vision. 5.4 Suture 5.4.1 Stitch length The stitch spacing of the bracelet stitching is measured with a steel ruler. 5.4.2 Stitch mark The stitch marks on the bracelet should be visually inspected. Parallelism can be measured with a caliper. 5.5 Punching and marking Under the conditions specified in QB/T 4781, visually inspect with normal vision. If necessary, a caliper can be used for measurement. 5.6 Tensile properties 5.6.1 Axial hole end tension Conduct tests on the long and short bracelets of the bracelet according to the following steps. a) Insert a steel shaft into the bracelet shaft hole and fix the steel shaft in the upper fixture; b) Fix the fixture at a distance of 40mm from the end of the bracelet axis hole. When fixing, the bracelet should be placed straight; c) Set the tension value of the tension machine based on the bracelet material and conduct the test. Maintain for 10 s. 5.6.2 Carrying tension Conduct tests on the long and short bracelets of the bracelet according to the following steps. a) Fix the fixture 5 mm away from the end of the bracelet axis hole; b) Fix the fixture at a distance of 40mm from the end of the bracelet axis hole; c) Set the tension value of the tension machine based on the bracelet material and conduct the test. Maintain for 10 s. 5.6.3 Hoop tension Thread the hoop into 2 steel shafts with a diameter of 2.5 mm and fix them in the upper and lower fixtures. Set the tension value of the tension machine based on the bracelet material and conduct the test. Maintain for 10 s. 5.7 Tensile and torsional fatigue resistance performance Connect the bracelet to the case and buckle it into a ring shape. Place it on the tensile torque machine as shown in Figure 2.The parameter values of the testing machine are set as follows. tensile force of 50 N, torque of 0.6 N · m, twisting frequency of 60 times/min, and twisting of 1000 times. 5.8 Bending fatigue performance Fix the two ends of the long and short bracelets respectively on the bending fatigue testing machine and conduct 2000 90° bending tests. 5.9 Wear resistance 5.9.1 Friction material The requirements and production methods of felt shall comply with the provisions of QB/T 2537.Dry felt is used in the dry friction test. Do not handle the felt in any way. Wet felt is used in the wet friction test. 5.9.2 Test steps Place the bracelet fabric facing upwards and secure it onto the friction testing machine. Then fix the test felt on the test head so that the test felt is in horizontal contact with the bracelet. Friction back and forth along the same track (counted as one round trip). The friction area of the bracelet should avoid the punching position. The mass of the test head is (1000 ± 25) g. The stroke is 25 mm~35 mm. The frequency of exercise is (40 ± 2) times per min. Perform a dry friction test with reciprocating friction for 300 times. Perform a wet friction test with reciprocating friction for 100 times. The dry friction test and wet friction test were conducted on different bracelets. After the test, remove the bracelet and felt. Visually inspect the friction area of the bracelet and the condition of the felt. Wet bracelets and felt should be dried at room temperature before visual inspection. 5.10 Punching test Choose any punching hole and insert and remove the buckle tongue used with the bracelet 200 times (counted as 1 insertion and extraction). Visually inspect the appearance of the bracelet after the test. 5.11 Buckle test 5.11.1 Thread the buckle used with the bracelet through all punching positions on the bracelet and repeat twice. 5.11.2 For bracelets using pin buckles, fix the pin buckles onto the buckle friction testing machine shown in Figure 3.Fold the bracelet through the buckle and ensure that the fabric contacts the buckle. Pull the bracelet with a force of 20 N~30 N to make it rub back and forth against the buckle (counted as one round trip). The friction stroke should be at least 2.5 cm. Friction should be repeated 200 times. The frequency of the testing machine ranges from 90 times/min~100 times/min. Visually inspect the appearance of the bracelet after the test. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
