-- The labels on spools meet the shipping requirements
-- Spool without breakage, edge without scratching and burrs
-- Enameled wire with uniform color and smooth surface
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。
-- 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 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
-- 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