fabric moisture permeability tester
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Fabric Moisture Permeability Tester
A Fabric Moisture Permeability Tester, also known as a Water Vapor Permeability Tester, is a laboratory instrument designed to measure the rate at which water vapor passes through textile materials. This measurement is crucial for assessing the breathability and comfort of fabrics, especially those used in active wear, outdoor gear, medical textiles, and protective clothing.
Purpose of Fabric Moisture Permeability Tester
The primary function of this tester is to evaluate a fabric’s ability to allow moisture vapor to pass through it, which directly impacts the wearer’s comfort by facilitating sweat evaporation and thermal regulation. High moisture permeability indicates better breathability, making the fabric suitable for applications where moisture management is essential.
Working Principle of Fabric Moisture Permeability Tester
The tester operates by placing a fabric specimen over a container filled with water. Under controlled temperature and humidity conditions, water vapor passes through the fabric over a specified period. The amount of water vapor transmitted is determined by measuring the weight loss of the container, allowing for the calculation of the Water Vapor Transmission Rate (WVTR).
Common Testing Methods
- Upright Cup Method: The fabric covers a cup containing water, and the assembly is placed upright in a controlled environment. After a set duration, the weight loss is measured to determine the WVTR.
- Inverted Cup Method: The fabric is sealed over a cup, which is then inverted and exposed to a controlled environment. The amount of water vapor absorbed by the fabric is measured over time.
- Sweating Hot Plate Test: Simulates human perspiration by measuring the energy required to maintain a constant temperature on a heated plate covered with the fabric, providing insights into the fabric’s breathability.
Key Specifications of Fabric Moisture Permeability Tester
– Test Cups: Typically 6 to 8 cups, each with a diameter of approximately 83 mm and a depth of 18.5 mm.- Turntable Speed: Approximately 2 revolutions per minute (RPM) to ensure uniform exposure.
– Environmental Conditions: Tests are conducted under controlled temperature (e.g., 23 ± 2°C) and humidity (e.g., 50 ± 5% RH) settings.
– Standards Compliance: Conforms to international standards such as ASTM E96, ISO 15496, BS 7209, and JIS L1099.
✅ Benefits of Fabric Moisture Permeability Tester
– Enhanced Product Development: Provides critical data for designing breathable and comfortable textiles- Quality Assurance: Ensures consistency in fabric performance across different production batches- Regulatory Compliance: Helps manufacturers meet industry standards and certifications.
– Consumer Satisfaction: Contributes to the development of garments that offer better moisture management, leading to increased wearer comfort.
Applications of Fabric Moisture Permeability Tester
– Active wear and Sportswear: Assessing fabrics for athletic performance and comfort.
– Outdoor and Protective Clothing: Ensuring materials provide adequate breathability while offering protection. Medical Textiles: Evaluating materials used in healthcare settings for moisture management.
– Technical and Industrial Textiles: Testing specialized fabrics used in various industrial applications.
Features of fabric moisture permeability tester
- Multi-Cup Design – Typically includes 6 or more test cups for simultaneous testing of multiple samples.
- Rotating Turntable – Ensures uniform air exposure and consistent vapor transmission across all samples.
- Precision Weighing System- Accurate measurement of weight loss to calculate water vapor transmission rate (WVTR).
- Temperature & Humidity Control – Maintains stable environmental conditions (e.g., 23°C, 50% RH) for reliable results.
- Digital Display or Software Interface – Displays real-time data and test status; advanced models offer data logging and export.
- Compliance with Standards – Supports ASTM E96, ISO 15496, BS 7209, JIS L1099 testing methods.
- Sealed Test Chambers- Prevents external air interference, improving accuracy.
- Corrosion-Resistant Construction – Durable materials suitable for long-term use in lab environments.
- Easy Sample Mounting – Quick and secure fabric placement on test cups with sealing rings.
- Low Maintenance Design- Simplified components for easy cleaning and upkeep.
How to Use Fabric Moisture Permeability Tester (Cup Method):
- Prepare the Test Solution – Fill each test cup with a set amount of water (e.g., 50 ml), or a desiccant if using inverted method.
- Mount the Fabric – Cut the fabric into circular pieces matching the cup size.
– Securely seal each fabric over the cup opening with a gasket and ring to prevent leakage.
- Weigh the Cups – Record the initial weight of each cup with the fabric mounted.
- Place on Turntable – Position all cups on the rotating tray inside the controlled chamber.
- Set Conditions – Close the chamber and maintain temperature (e.g., 23°C) and relative humidity (e.g., 50%) as per test standard.
- Start the Test – Begin rotation (usually ~2 RPM) and let it run for the specified time (often 24 hours).
- Weigh the Cups Again- After the test duration, reweigh the cups to determine weight loss due to moisture vapor passing through the fabric.
- Calculate WVTR – Use the formula: WVTR = (Weight Loss in grams × 24) / (Test Area in m² × Time in hours) Expressed in g/m²/24h.
- Clean and Store – Clean cups and components for future use.
fabric moisture permeability tester
Scope of application
It is used to determine the moisture permeability of various fabrics
(including moisture permeable coated fabrics)
and nonwovens such as batting cotton and space cotton.
[Related standards] GB/T12704 ASTM E90 JIS L1099A BS 7209 JIS L1099B (custom) etc.
Instrument characteristics
1. Integrated structure of baking oven and constant temperature and humidity box.
2. Microcomputer control, color touch screen Chinese menu operation.
3. Circulating air velocity 0.2-3m/s digital setting.
4. Imported high-precision temperature and humidity sensor, imported motor drive, ceramic
heating tube heating.
Technical parameters
1.Work mode: Microcomputer control, color touch screen Chinese menu operation, test environment monitoring.
2. Sample box control temperature:15 ~ 40 C, accuracy 0.1 + C, resolution 0.01 C
3. Heat dissipation mode:Air cooling
4. Sample box control humidity:30 ~ 95%, precision + 2%, resolution 0.01%
5. Test chamber humidification:≥300ml/h
6. Accompany oven control temperature: Room temperature to 200 c
7. Test time:1min~999h59min
8. The rate of circulating steam flow:0. 2-3m/s digital setting resolution 0.01m/s
9. Moisture permeability area:2827㎜2(∮60㎜GB)
Optional 3848, 2 (70 70 ASTM)
10. The number of moisture permeable cups.6 (GB) can be replaced by 6 (US standard).
11. Internal dimensions of drying oven:490×400×215mm
12. Power supply:Ac220V 50Hz 6kw
13. Size:930×820×1700mm
14. Weight:350kg
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Fabric Drape Tester is a lab device used to measure the drape ability of fabric—how it hangs under its own weight. It assesses how fabric conforms in folds or waves, which affects garment appearance and comfort. Purpose of Fabric Drape Tester: To evaluate the aesthetic and functional behavior of a fabric when suspended, especially important in apparel and home textiles. Working Principle: A circular fabric specimen is placed over a smaller disc. The unsupported edges drape downward. A light source casts a shadow of the draped shape onto a recording surface or scanner. The area of the shadow is measured to calculate the drape coefficient. Main Components of Fabric Drape Tester: - Rotating Support Disc: Holds the fabric. - Light Source: Projects the drape shadow. - Paper or Digital Scanner: Captures the drape outline. - Template: For cutting fabric to standard test size. - Software or Plan meter: Calculates the drape coefficient. Applications of Fabric Drape Tester: - Fashion and apparel design - Fabric development - Quality control in woven, knitted, or nonwoven fabrics Benefits of Fabric Drape Tester:- Quantifies Fabric Flow - Measures drape behavior accurately, crucial for garments and furnishings.
- 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.
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- 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.
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- 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.
- 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).
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- 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.
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- Prepare the Sample - Cut the fabric into a rectangular strip (e.g., 25 mm × 200 mm), as per standard.
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- 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°).
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- High-Speed Rotating Impellers - Impellers rotate at around 1200 rpm to create intense, random tumbling motion.
- Compressed Air System - Ensures continuous fabric movement and realistic simulation of wear.
- Digital Timer- Allows precise setting of test duration with easy-to-read display.
- Viewing Windows- Transparent chamber doors for monitoring fabric movement during testing.
- Standard Compliant Design- Meets ASTM D3512, ISO 12945-3, GB/T 4802.4 and other major standards.
- Robust Construction- Durable materials and components designed for long-term laboratory use.
- Easy Sample Handling - Quick-open chamber lids and simple sample placement process.
- Compact Footprint- Saves space in laboratory environments.
- Prepare Samples- Cut fabric into standard-sized specimens (usually circular or rectangular per ASTM/ISO specs)- Condition samples as per the standard (usually 24 hrs at 21°C, 65% RH).
- Load the Chambers - Place each sample into a cork-lined test chamber. - Add a small piece of gray cotton backing fabric if required by the method.
- Set Parameters - Adjust compressed air pressure (typically 14–21 kPa or 2–3 psi).
- Start the Test- Close the chamber doors and press start. - Impellers rotate, tumbling the samples randomly with air flow.
- Stop and Unload - Once the timer ends, remove the samples carefully.
- Evaluate Pilling - Compare the tested samples to standard pilling rating photographs or scales.
- Record Results - Document the pilling grades and any observations.
