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Fabric Stiffness Tester
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Fabric Stiffness Tester
Fabric Stiffness Tester
Fabric Stiffness Tester is a lab instrument used to measure the stiffness or flexural rigidity of fabric materials. It evaluates how resistant a fabric is to bending, which influences its drape, comfort, and handling characteristics.
Purpose of Fabric Stiffness Tester:
To determine the stiffness of textiles by measuring the bending length and calculating flexural rigidity, often using methods like the Cantilever Test (as per ASTM D1388 or ISO 9073-7).
Working Principle of Fabric Stiffness Tester:
A fabric strip is slid over a horizontal platform until its free end bends under its own weight to a specific angle (usually 41.5°). The length at which this occurs is used to calculate bending length and stiffness.
Main Components of Fabric Stiffness Tester:
– Test Platform: Flat surface for sample movement.
– Graduated Scale: Measures the overhanging length of fabric.
– Angle Indicator: Guides the measurement based on standard deflection angle.
– Fabric Clamp or Guide: Helps place and move the sample smoothly.
Applications of Fabric Stiffness Tester:
– Apparel fabrics (e.g., for comfort and drape analysis)
– Technical textiles (e.g., automotive, medical fabrics)
– Paper, nonwovens, and films
Benefits of Fabric Stiffness Tester:
- Accurate Measurement of Flexibility – Provides reliable data on fabric stiffness, essential for quality control and product development.
- Improves Product Comfort – Helps assess how soft or rigid a fabric will feel in clothing or furnishings.
- Supports Material Selection – Aids designers and engineers in choosing the right fabric for specific applications based on stiffness.
- Quality Assurance – Detects fabric inconsistencies or defects that affect handling or drape.
- Standards Compliance – Enables testing as per international standards like ASTM D1388 and ISO 9073-7 for global product approval.
- Quick and Simple Operation – Delivers fast results with minimal operator training or preparation.
- Applicable to Multiple Materials – Suitable for woven, nonwoven, knitted fabrics, paper, and films.
- Enhances R&D Accuracy – Supports consistent material testing during product innovation and textile finishing.
Features of Fabric Stiffness Tester:
- Graduated Measurement Scale – Precise scale to measure overhang length for accurate stiffness calculation.
- Flat Test Platform – Smooth, level surface ensures consistent and reliable fabric movement.
- Standard Deflection Angle Guide – Built-in 41.5° angle reference for consistent stiffness testing (per ASTM/ISO).
- Manual or Motorized Models – Available in both types for simple or automated operation depending on lab needs.
- Compact Design – Space-saving unit ideal for textile labs and quality control rooms.
- Sample Holder or Clamp – Ensures correct alignment and smooth feeding of fabric strips during testing.
- Durable Construction – Made of corrosion-resistant materials like stainless steel or aluminum for long-term use.
- Compliance with Standards – Supports methods like ASTM D1388, ISO 9073-7 for stiffness testing of fabrics.
- Lightweight and Portable – Easy to move and use in various lab settings.
- Low Maintenance – Simple mechanical parts require minimal servicing.
How to Use Fabric Stiffness Tester (Cantilever Method):
- Prepare the Sample – Cut the fabric into a rectangular strip (e.g., 25 mm × 200 mm), as per standard.
- Place the Sample – Lay the fabric strip flat on the test platform with one end aligned at the zero mark.
- Slide the Fabric – Gently push the fabric forward so it slowly overhangs the platform.
- Watch for Deflection – Stop sliding when the free end of the fabric bends down to the reference angle (typically 41.5°).
- Read the Bending Length – Measure the overhang distance from the scale. This is the bending length (C).
- Calculate Flexural Rigidity
– Use the formula:
G = W × C³
Where:
– G = Flexural rigidity (mg·cm)
– W = Fabric weight per unit area (mg/cm²)
– C = Bending length (cm)
- Repeat for Accuracy – Test both warp and weft directions and average the results for better accuracy.
Tip: Always perform the test in a controlled environment (standard temperature and humidity) for reliable results.
Fabric Stiffness Tester
Scope of application
It is used to measure the stiffness of cotton,
wool, silk, linen, chemical fibers and other woven fabrics,
knitted fabrics, general nonwovens, coated fabrics, etc.
It is also suitable for measuring the stiffness of paper,
leather, film and other flexible materials.
Relevant Standards
GB/T 18318, ASTM D 1388, IS09073-7, BS EN22313 etc.
[Instrument Characteristics]
1. Infrared photoelectric invisible inclined plane
detection system replaces the traditional tangible inclined plane,
realizes non-contact detection, and overcomes the problem that
the measurement accuracy is affected by
the sample torsion lifted by the inclined plane.
2. The inclination adjustable mechanism of instrument
measurement to meet different test requirements.
3. Stepping motor drive, accurate measurement, smooth operation;
4. The color touch screen display can show the extended length,
bending length, bending stiffness of the sample, the warp average,
the weft average and the total average of the above values respectively.
5. Printing of Chinese report forms for thermal printers.
Technical parameters
1. Test methods: The two method (A method: Weft test, B method: Forward and backward test)
2. Measurement angle:41.5 degree, 43 degree and 45 degree adjustable
3. Extend the length range:5-220 mm (special requirements can be made at the time of ordering)
4. Length resolution:0.01mm
5. Measurement accuracy:±0.1mm
6. Specimen specifications:250×25mm
7. Work platform specifications:250×50mm
8. Specification of sample pressing plate:250×25mm
9. Pushing speed of press plate:3 mm/s; 4 mm/s; 5 mm/s
10. Display output: Touch screen display
11. Print Output: Chinese Report
12. Data Processing Volume: A total of 15 groups, each group less than 20 trials
13. Printer: Thermal printer
14, power supply:AC220V 50Hz
15. Host volume:570mm×360mm×490mm
16. Host weight:20kg
Description
Shipping & Delivery
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- Gray Scale for Color Change - Compares the original and tested sample to measure color fading or alteration.
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- Widely Accepted - Complies with international standards (ISO, AATCC) for color fastness grading.
- Cost-Effective Tool - Inexpensive yet essential for reliable quality control in textiles.
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- Dual Type Availability - Comes in two types: for Color Change and for Staining.
- 5-Point Grading System - Grades from 1 (poor) to 5 (excellent), with half-step intervals like 4–5, 3–4.
- Standardized Grey Chips - Includes contrasting grey color pairs to match fabric changes accurately.
- Compact Design - Small, portable card or booklet format for easy lab and field use.
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- Compliance with Standards - Follows ISO 105-A02 (Color Change) and ISO 105-A03 (Staining) norms.
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- Match Against Gray Scale Chips - Visually compare the difference between the samples and find the closest matching gray pair on the scale.
- Assign a Grade
- Record the Result - Note the grade in your test report as per the test method (e.g., ISO 105).
- Store Properly - Keep the gray scale away from light and moisture to avoid fading.
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- Supports Design Decisions - Helps designers select fabrics that match the intended look and movement of a product.
- Improves Garment Fit and Comfort - Ensures fabrics behave naturally on the body, enhancing wear ability.
- Enhances Product Aesthetics - Prevents stiff or limp fabric choices in fashion, interior, or technical textiles.
- Standardized Evaluation - Enables comparison across fabrics using drape coefficient, based on standards (e.g., BS 5058).
- Supports R&D - Useful in developing new fabrics or finishes to improve drape quality.
- Non-Destructive Testing - Tests fabric without damaging it, allowing for further analysis.
- Boosts Quality Control - Identifies batch inconsistencies or performance issues early in production.
- Rotating Support Disc - Holds the fabric sample over a smaller disc to create natural drape.
- Standard Sample Size Support - Designed for circular fabric samples, usually 30 cm in diameter.
- Light Projection System - Projects the draped fabric’s shadow onto a screen or recording surface.
- Drape Coefficient Calculation - Measures the shadow area to compute the drape coefficient (percentage of unsupported area covered by the shadow).
- Digital or Manual Options - Available in models with digital image processing or manual plan meter tracing.
- Stable Base and Structure - Ensures consistent and vibration-free testing conditions.
- Sample Templates Provided - For cutting precise, standard-sized fabric specimens.
- User-Friendly Interface - Simple controls for rotation and light alignment.
- Compact and Lab-Ready Design - Fits easily on lab benches and in testing environments.
- Compliance with Testing Standards - Supports BS 5058 and other relevant drape measurement methods.
- Prepare the Fabric Sample - Cut a circular fabric sample, typically 30 cm in diameter, using the provided template.
- Place the Fabric - Center the fabric sample over the smaller support disc (usually 18 cm diameter) on the tester.
- Turn on the Light Source - Illuminate the fabric from above so it casts a shadow onto the recording surface or paper below.
- Capture the Shadow Outline - Trace the shadow manually on paper or capture it digitally, depending on the model.
- Measure the Shadow Area - Use a plan meter (manual) or software (digital) to determine the shadow’s area.
- Calculate Drape Coefficient (DC) - Use the formula:
- Record the Result - Log the drape coefficient to evaluate how stiff or flexible the fabric is.
- Repeat for Accuracy - Test multiple samples and average the results for consistency.
It is used for testing dynamic and static drape properties
(drape coefficient, shape change rate, surface ripple and drape uniformity, etc.)
of various fabrics.
Related standards GB/T23329 FZ/01045 BS5058 etc.
Instrument characteristics
1. CCD imaging, dynamic and static image processing.
2. A variety of charts and data statistics, analysis, storage, output
3. No need to replace background color, can test all kinds of color samples.
4. Work mode:Microcomputer control, CCD imaging, automatic processing of images and data automatically.
Technical parameters
1. Communication interface: RS232, USB
2. Image sensor: CCD sensor.
3. Static (dynamic) state draping coefficient: 0 ~ 100% + 2
4. Drapability uniformity: 0 ~ 100% + 2
5. The rate of morphological change is 0 to 100% + 2.
6. Surface waviness error: + 1 
