Appearance:

-- The labels on spools meet the shipping requirements

-- Spool without breakage, edge without scratching and burrs

-- Enameled wire with uniform color and smooth surface

Dimensions

The measurement of the dimensions shall be measured with an instrument with an accuracy of 1/1000 mm. Take 100 cm from each spool as sample to measure the diameter of the sample as a test point.

-- Tolerance of conductor size,

-- Minimum film thickness

-- Maximum diameter

3. Electrical property

-- Electrical resistance

 1/ The resistance of 100 cm winding wire (temperature)

-- voltage breakdown

1/ Testing method as round baton when the diameter is under 0.100mm.

2/ Testing method as intertwining when the diameter is over 0.100mm.

mechanical property

-- Elongation: The ratio of the final length and initial.

-- Resilience: The testing angle of trial conductor is under appropriate standard

1/ Enameled wire should have a certain flexibility

2/ Different diameter hanging different weight, in different diameter reel winding 5.5 laps

3/ Remove the weight, copper rebound, leaning on the lotus sensor

4/ Instrument rotation, when the coil release stress, the copper wire again after the lotus, the instrument stops rotating, showing the rebound angle reading

-- film elasticity: checking if the coating crack after continuously wind 10 cycles on tested product.

-- Jerk test: checking if coating crack or loss adhesion by speed of 2 m/s.

-- peel test: scratching coating layer,winding enough rolls,checking conductor’s adhesion.

-- Unidirectional scrape paint test: increasing pressure until conductor leaked out , to know bearable maximum pressure.

Objective: Make the enameled film coating adhesion quantized

  Method: 1/ Select the corresponding weight according to the diameter.

2/ Enter the weight of the weight.

3/ Start the instrument, direct reading.

-- friction factor test

Thermal property

-- thermal shock: After winding or stretching the enameled wire according to the regulations, observe whether the paint film is cracked at a certain temperature for a certain period of time.

-- softening breakdown: Two enameled wire samples intersect perpendicularly, checking bearable ability at the intersection under a specified load and specified temperature.

1/ High temperature conditions: 220 ℃

2/ Force conditions: 0.25 ~ 70N adjustable

3/ Time: 30mins

Chemical property

-- solvent resistance: (without picture of instrument)

1/ The hardness of the 2H pencil is used to indicate the solvent-treated enameled wire.

-- straight welding: It is expressed by the time that immersing the sample in the solder bath to remove the paint film and plate the tin layer.

7. Special Enameled Wires Test Items