How to do Filament Yarn Strength Test?

Automatic testing:

Set up test parameters as the first step and then install the specimen

Press “START” button on the operating panel. The manipulator returns to the lowest position and the lower clamp goes up to the top at the max. speed until it touches the upper limit switch.

The specimen is clamped and a downward movement follows. The moment for it to leave the upper limit switch is taken as the initial point of length measurement. The number of encoder impulse is registered so that the lower clamp stops moving when it reaches at the preset gauge length.

Now the manipulator grips the specimen to apply pretension and the upper clamp closes by suction. The lower clamp draws at the preset speed and the load cell is applied by force. The computer registers the force value of the load cell and the elongation value of the encoder, which are sent to the screen for display and plotting a force-elongation curve.

When a cycle of drawing is completed, the computer processes the registered values to get the data of breaking force, breaking tenacity, breaking elongation, elongation at break, work done, time-to-break, elongation at specified force, force at specified elongation, etc. The remaining yarn after breaking is automatically collected by suction into the suction box.

Then the tester repeats the above cycle for the next test. When a bobbin is completely tested, the front guide rack moves one step to the right side and the pneumatic scissor cuts off the previous yarn. Then the manipulator goes up to the highest position to pick up the next yarn for testing. The tester stops operation as soon as tests are completed entirely. When “Data Statistics” is clicked, the single test value and the max., min., mean and CV% values of the test data will be displayed. The user may choose printout or data saving.

As for fiber factory or lab research .They should know their sample is filament or staple fiber. Thus we can recommend the correct model the correct model with correct clamp .

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