Digital Yarn Twist Tester

Digital Yarn Twist Tester

A Digital Yarn Twist Tester is a laboratory device used to measure the number of twists (turns) per unit length in a yarn. It’s crucial for evaluating yarn quality, strength, elasticity, and uniformity. The digital version offers precise, automated readings for both S-twist and Z-twist yarns.

Purpose Digital Yarn Twist Tester:

To determine twist per inch (TPI) or twist per meter (TPM) in single and plied yarns using direct untwist or untwist-retwist methods.

Applications Digital Yarn Twist Tester:

Quality control in spinning mills

Yarn standard testing (cotton, polyester, blends)

R&D in textile manufacturing

Working Principle Digital Yarn Twist Tester:

One end of the yarn is clamped, and the other is rotated to remove or measure twists.

The tester counts and displays twist digitally based on length and rotation.

Benefits of Digital Yarn Twist Tester:

High Accuracy – Digital readout ensures precise twist measurements.

Quick Testing – Faster than manual methods, increasing lab efficiency.

Versatile Application – Suitable for single, doubled, or plied yarns.

Reduces Human Error – Automated counting improves repeatability and consistency.

Supports Both S & Z Twist – Measures both twist directions accurately.

User-Friendly Operation – Intuitive controls and clear display simplify use.

Features of Digital Yarn Twist Tester:

Digital Display – Shows real-time twist count and length.

Motorized Rotation- Smooth, adjustable rotation speed for controlled untwisting.

Dual Clamp System – Holds yarn securely to prevent slippage.

Length Measurement Scale – Built-in ruler or encoder for precise yarn length setup.

Auto Stop Function – Automatically stops when yarn is fully untwisted.

Selectable Units – Twist readings available in TPI or TPM.

How to Use Digital Yarn Twist Tester:

Prepare the Yarn Sample

– Cut a yarn length (e.g., 250 mm or 10 inches) as per testing standard.

– Make sure it’s free from knots or damage.

Mount the Yarn   – Fix one end in the stationary clamp and the other in the rotating clamp.

– Ensure the yarn is straight and under slight tension.

Set the Gauge Length – Adjust the length scale or input it digitally, depending on the machine.

Select Twist Direction – Choose S or Z direction based on the yarn’s twist.

Start the Test – Activate the motor to untwist (or untwist-retwist, if applicable).   – The display shows the number of rotations. Read the Twist Value  – The twist (TPI/TPM) appears automatically based on the set length.

Stop and Unload – Once reading is complete, stop the machine and remove the yarn.

Record the Result – Note the reading for documentation or further analysis.

Maintenance Tips for Digital Yarn Twist Tester:

Daily:

☐ Wipe down the machine and clamps to remove dust or fibers

☐ Check for yarn residue on rotating parts

☐ Ensure display and buttons are responsive

Weekly:

☐ Lubricate rotating spindle lightly (if required)

☐ Inspect clamps for wear or misalignment

☐ Test motor rotation for smooth operation

☐ Check twist direction selector switch

Monthly:

☐ Calibrate digital display if twist readings drift

☐ Inspect electrical wiring and connectors

☐ Tighten any loose screws or panel parts

Safety Tips:

Avoid Loose Clothing: Prevent getting caught in the rotating spindle

Use Proper Yarn Tension: Overstretching may snap the yarn or damage clamps

Handle With Care: Avoid rough handling of the digital panel or twist arm

Power Off When Not in Use: Prevents accidental operation

Follow Manual: Refer to user guide for specific calibration or cleaning procedures

Digital Yarn Twist Tester – Maintenance & Safety Checklist

Daily Maintenance:

☐ Clean clamps and body surface

☐ Remove lint or yarn fragments

☐ Verify display & control buttons function properly

Weekly Maintenance:

☐ Lightly lubricate spindle if required

☐ Inspect clamp alignment and grip

☐ Test motor for smooth, silent operation

☐ Check twist direction switch

Monthly Maintenance:

☐ Calibrate twist reading accuracy

☐ Inspect cables and connectors

☐ Tighten loose hardware

☐ Run full test to ensure system performance

Safety Checklist:

☐ Keep hands clear of rotating parts during testing

☐ Avoid loose clothing or jewelry

☐ Do not overstretch or over tension yarn

☐ Power off when cleaning or not in use

☐ Follow the machine’s manual for calibration and service

Basic Troubleshooting Guide – Digital Yarn Twist Tester

Issue: No Power / Display Not Turning On

–  Check power cable and socket

–  Inspect fuse or main switch

–  Ensure emergency stop isn’t engaged

Issue: Twist Count Seems Inaccurate

–  Recalibrate the machine

–  Verify yarn length input is correct

–  Check for slippage in clamps

Issue: Motor Not Rotating

–  Ensure motor switch is ON

–  Inspect motor connection and wiring

–  Test rotation manually to check for blockage

Issue: Display Freezes or Buttons Unresponsive

–  Restart the machine

–  Check control panel for dust or moisture

–  Contact support if issue persists

Issue: Auto-Stop Not Working

–  Ensure length and twist direction are set

–  Check sensor alignment or damage

–  Reboot and re-run test

Scope of application
It is used for testing the twist, twist irregularity and twist shrinkage of all kinds of yarns.
[Related standards]
GB/T2543.1/2 FZ/T10001 ISO2061 ASTM D1422 JIS L1095 etc.

Technical parameters
1. Work mode:Computer program control, data processing, printout results
2. Test methods:
A, Average twisting slip elongation
B, Average maximum twisting elongation.
C, Direct counting method D, twisting twisting A method
E, Twisting twisting B method f and three times twisting twisting method

3. Sample length:10、25、50、100、200、250、500mm
4. Twist test range:1~1998 twist /10cm, 1~1998 twist /m
5. The extent of twist removal:Maximum 50mm
6. Maximum twist measurement.20mm
7. Speed:600～3000r/min
8. Pre tension:0.5～171.5cN

Digital Yarn Twist Tester

9. Size:920×170×220mm
10. Power supply:Ac220V 50Hz 25W
11. Weight:16kg