As a supplier of Tencel Lyocell Twill, ensuring the colorfastness of our products is of utmost importance. Colorfastness refers to the ability of a fabric to retain its color when exposed to various conditions such as washing, rubbing, light, and perspiration. In this blog post, I'll share some effective methods to test the colorfastness of Tencel Lyocell Twill, providing you with insights into maintaining the high - quality of our fabrics.
1. Washing Fastness Test
The washing fastness test is one of the most common ways to evaluate how well the color of Tencel Lyocell Twill holds up during laundering.
Test Materials and Equipment
- Fabric Samples: Cut several pieces of Tencel Lyocell Twill samples with a size of about 10cm x 4cm. Make sure the samples are representative of the whole batch of fabric.
- Washing Machine: A standard household washing machine can be used, preferably one that can simulate different washing cycles and temperatures.
- Detergent: Use a common laundry detergent without any special color - brightening or bleaching agents.
- Gray Scale for Assessing Change in Color: This scale is used to evaluate the degree of color change of the fabric sample after washing. It ranges from 1 (severe color change) to 5 (no color change).
Test Procedure
- First, weigh the fabric samples accurately and record their initial weights.
- Place the fabric samples in the washing machine along with a certain amount of detergent according to the manufacturer's instructions.
- Select a washing cycle. For Tencel Lyocell Twill, a normal cotton cycle at 40°C is a common choice. However, you can also test at different temperatures (such as 30°C and 60°C) to simulate different real - life washing scenarios.
- After the washing cycle is completed, remove the fabric samples from the washing machine and rinse them thoroughly with clean water to remove any remaining detergent.
- Hang the samples to dry in a shaded area away from direct sunlight.
- Once the samples are completely dry, use the gray scale to assess the change in color. Compare the washed samples with the unwashed samples and determine the grade of color change.
2. Rubbing Fastness Test
The rubbing fastness test measures the resistance of the fabric's color to rubbing. It is divided into dry rubbing fastness and wet rubbing fastness.
Test Materials and Equipment
- Fabric Samples: Similar to the washing fastness test, cut fabric samples of appropriate size (e.g., 20cm x 5cm).
- Crockmeter: A crockmeter is a device specifically designed for rubbing fastness testing. It has a rubbing head that can move back and forth on the fabric sample.
- Cotton Rubbing Cloths: For dry rubbing, use dry cotton cloths; for wet rubbing, soak the cotton cloths in distilled water and wring them out until they are damp but not dripping.
- Gray Scale for Assessing Staining: This scale is used to evaluate the degree of color transfer from the fabric sample to the rubbing cloth. It also ranges from 1 (severe staining) to 5 (no staining).
Test Procedure
- Dry Rubbing Test
- Mount the fabric sample on the base of the crockmeter.
- Attach a dry cotton rubbing cloth to the rubbing head of the crockmeter.
- Set the crockmeter to rub the fabric sample for a certain number of cycles (usually 10 cycles).
- After the rubbing is completed, remove the rubbing cloth and use the gray scale for assessing staining to evaluate the degree of color transfer from the fabric to the cloth.
- Wet Rubbing Test
- Follow the same steps as the dry rubbing test, but use a damp cotton rubbing cloth instead. Make sure the moisture content of the cloth is consistent for accurate results.
- After rubbing, dry the rubbing cloth in a shaded area and then assess the staining using the gray scale.
3. Light Fastness Test
The light fastness test evaluates how the color of Tencel Lyocell Twill changes when exposed to light.
Test Materials and Equipment
- Fabric Samples: Prepare fabric samples and mark them clearly for identification.
- Light Source: A xenon arc lamp is commonly used as a light source to simulate natural sunlight. It can provide a spectrum of light similar to that of sunlight.
- Light Exposure Chamber: This chamber is used to control the intensity and duration of light exposure.
- Gray Scale for Assessing Change in Color: As in the washing fastness test, this scale is used to evaluate the color change of the fabric samples after light exposure.
Test Procedure
- Place the fabric samples in the light exposure chamber under the xenon arc lamp.
- Set the light intensity and exposure time according to the relevant standards. For example, you can expose the samples to light for 20 hours, 40 hours, or more, depending on the requirements.
- Periodically check the fabric samples during the exposure process.
- After the specified exposure time is completed, remove the samples from the chamber and let them cool to room temperature.
- Use the gray scale for assessing change in color to evaluate the degree of color change of the samples.
4. Perspiration Fastness Test
The perspiration fastness test assesses how the fabric's color is affected by perspiration.
Test Materials and Equipment
- Fabric Samples: Cut fabric samples as required.
- Perspiration Solutions: Prepare two types of perspiration solutions: acidic perspiration solution (simulating the pH of human sweat under normal conditions) and alkaline perspiration solution (simulating the pH of sweat during heavy exercise).
- Test Jars or Containers: These are used to soak the fabric samples in the perspiration solutions.
- Pressing Apparatus: A pressing apparatus is used to apply pressure to the soaked fabric samples to simulate the contact between the fabric and the skin.
- Gray Scale for Assessing Change in Color and Staining: To evaluate both the color change of the fabric sample and the staining of adjacent fabrics.
Test Procedure
- Soak the fabric samples in the acidic and alkaline perspiration solutions respectively for a certain period (usually 30 minutes).
- After soaking, place the samples between two adjacent fabrics (such as white cotton fabrics) and put them in the pressing apparatus. Apply a certain pressure (e.g., 12.5kPa) for a specific time (e.g., 4 hours).
- Remove the samples from the pressing apparatus and dry them in a shaded area.
- Use the gray scales to evaluate the color change of the fabric samples and the staining of the adjacent fabrics.
Importance of Colorfastness Testing
Colorfastness testing is crucial for our Tencel Lyocell Twill products. High - quality colorfastness ensures that our customers can enjoy long - lasting and vibrant colors in their clothing and other textile products made from our fabric. It also reflects the overall quality and durability of our Tencel Lyocell Twill.
As a supplier, we are committed to providing fabrics with excellent colorfastness. We regularly conduct these tests on our products to meet the high - standards of our customers. Our Tencel Fabric Products are known for their superior quality, and the Polyester Tencel Blend Fabric also combines the advantages of both materials. Moreover, the Tencel Fabric Breathable feature makes our products even more appealing.
If you are interested in our Tencel Lyocell Twill or other related products, we welcome you to contact us for further procurement and negotiation. We are looking forward to establishing long - term and mutually beneficial partnerships with you.
References
- AATCC Test Methods: A collection of standardized test methods for textiles, including colorfastness tests.
- ISO Standards: International standards related to textile testing, which provide detailed guidelines for colorfastness testing.
