The cord winding crack tester is used to determine the bending performance of wires and cables at low temperatures. It is suitable for round wire and cable with outer diameter ≤12.5mm or round insulated core, and flat wire and cable with size ≤20mm or fan-shaped insulated core that cannot be made into dumbbells. The machine is an indispensable instrument in the wire and cable industry for the bending function test of products. The test standards be used for cord winding crack machine include:
IEC 60811-1-4 JIS C 3005 2014 ISO 6722-1 ISO 6722 -2 Test Mothod for Cord Winding Crack Tester: The machine is specialized in testing the impact and bending of the variable wires under low-temperature condition. If the cross -sectional area of than 100mm², then specimen must be put into testing chamber for freezing for one hour, after that immediately rolls specimen aro specified rod in a uniform speed. Otherwise, for the cross – sectional area over 100mm², roll the specimen before hand and put in freezing one hour. Afterwards, immediately roll specimen around the rod in reverse direction. Finally, take out of specimen for check its surface has crack or fissure or not.
The cord winding crack tester produced by Wewon Tech is suitable for the bending performance test of power distribution and communication cables and optical cables, including the material changes of the polymer insulation and protective sheath materials of marine and offshore cables and optical cables after bending at different temperatures. The test standards frequently used by customers are: ISO 6722-1 and ISO 6722-2. ISO 6722 has two parts, Part 1 is the size, test methods and requirements of copper conductor wires, and Part 2 is the size, test methods and requirements of aluminum conductor wires. Page Source: http://blog.sina.com.cn/xmsgstest
| Model Description | WEW-XL-010 | WEW-XL-100 |
| Test Room (mm) | 400×500×500 | 1000×1000×1000 |
| Dimensions (mm) | 1030×1020×1470 | 1610×1560×1960 |
| Temperature Range | -40°C (C type) ︱-70°C (E type) |
| Volatility Uniformity | ≤±0.5℃︱≤2℃ |
| Temperature Rise | 0.7~1℃/min (3℃/min, 5℃/min, 10℃/min) |
| Insulation Materials | Glass Fiber Cotton ︱Rigid Polyurethane Foam |
| Cooler System | Multi-stage Diaphragm Evaporator |
| Air Circulation | Single circulation, extended shaft, stainless steel centrifugal fan blades |
| Cooling Method | Unit Cooling Method︱Dual (cascade) Cooling Method |
| Compressor | French “Tecumseh” fully enclosed refrigeration compressor |
| Controller | Japan “Fuji” ︱ Honeywell, USA |
| Sensor Type | PT100 Platinum Resistance |
| Security Device | Leakage protection, over-temperature protection, fast fuse, compressor over-voltage protection |
| Standard Configuration | Internally heated hollow glass observation window: one 250×300 (mm), One test hole φ50mm, Two sample holders, One lighting lamp |
| Power Supply | 220V 50Hz︱380V 50Hz |
ISO 6722-1 Road Vehicles 60V and 600V Single-Core Cables, Part 1: Dimensions, test methods and requirements for copper conductor cables. ISO 6722-1: 2011 Main Test Content Include:
| 1 Outside Cable Diameter (ISO 6722-1 Section 5.1) | 2 Insulation Thickness (ISO 6722-1 Section 5.2) |
| 3 Conductor Diameter | 4 Conductor Resistance |
| 5 Withstand Voltage | 6 Insulation Faults |
| 7 Insulation Volume Resistivity | 8 Pressure test at High Temperature |
| 9 Strip Force | 10 Low Temperature Winding |
| 11 Cold Impact | 12 Sandpaper Abrasion |
| 13 Scrape Abrasion | 14 Long-term Ageing, 3000 Hours |
| 15 Short-term Ageing, 240 Hours | 16 Thermal Overload |
| 17 Shrinkage by Heat | 18 Fluid Compatibility (ISO 6722-1 Section 5.17) |
| 19 Durability of Cable Marking | 20 Resistance to Ozone (ISO 6722-1 Section 5.19) |
| 21 Resistance to Hot Water | 22 Temperature and Humidity Cycling |
| 23 Resistance to Flame Propagation | . |
| ● | ISO 1817 Rubber, Vulcanized or Thermoplastic –Determination of the Effect of Liquids | ISO 6722-1 Reference Standards |
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| ● | ISO 6931-1 Stainless Steels for Springs –Part 1: Wire |
| ● | IEC 60811-2-1 Common Test Methods for Insulating and Sheathing Materials of Electric and Optical Cables Part 2-1: Methods Specific to Elastomeric Compounds –Ozone Resistance, Hot Set and Mineral Oil Immersion Tests |
| ● | ASTM B1 Standard Specification for Hard Drawn Copper Wire |
| ● | ASTM B3 Standard Specification for Soft or Annealed Copper Wire |
| ● | ASTM B33 Standard Specification for Tin Coated Soft or Annealed Copper Wire for Electrical Purposes |
| ● | ASTM B298 Standard Specification for Silver Coated Soft or Annealed Copper Wire |
| ● | ASTM B355 Standard Specification for Nickel Coated Soft or Annealed Copper Wire |
| ● | EN 13602 Copper and copper alloys –Drawn, round copper wire for the manufacture of electrical Conductor |
ISO 6722 -2 Road Vehicles 60V and 600V Single-Core Cables, Part 2: Dimensions, test methods and requirements for aluminium conductor cables. ISO 6722-2: 2013 Main Test Content Include:
| 1 Outside Cable Diameter (ISO 6722-2 Section 5.1) | 2 Insulation Thickness (ISO 6722-2 Section 5.2) |
| 3 Conductor Diameter | 4 Cross-Sectional Area (ISO 6722-2 Section 5.3.2 Method 2) |
| 5 Conductor Resistance | 6 Withstand Voltage |
| 7 Insulation Faults | 8 Insulation Volume Resistivity |
| 9 Pressure Test at High Temperature | 10 Strip Force |
| 11 Low Temperature Winding | 12 Cold Impact |
| 13 Sandpaper Abrasion | 14 Scrape Abrasion |
| 15 Long-Term Ageing, 3000 Hours | 16 Short-Term Ageing, 240 Hours |
| 17 Thermal Overload | 18 Shrinkage by Heat |
| 19 Fluid Compatibility (ISO 6722-2 Section 5.17) | 20 Durability of Cable Marking |
| 21 Resistance to Ozone (ISO 6722-2 Section 5.19) | 22 Resistance to Hot Water |
| ● | ISO 6722-1 Road Vehicles –60V and 600V Single-Core Cables –Part 1: Dimensions, Test Methods and Requirements for Copper Conductor Cables | ISO 6722-2 Reference Standards |
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| ● | ISO 6892-1 Metallic Materials –Tensile Testing –Part 1: Method of Test at Room Temperature |
| ● | EN 573-1 Aluminium and Aluminium Alloys –Chemical Composition and Form of Wrought Products –Part 1: Numerical Designation System |
| ● | EN 573-3:2009 Aluminium and Aluminium Alloys –Chemical Composition and Form of Wrought Products –Part 3: Chemical Composition and Form of Products |
