Application
The Fabric Density Glass is used to measure the number of yarns per unit area of fabric, both in the warp (lengthwise) and weft (widthwise) directions.
Fabric Density Definition
Fabric density refers to the number of yarns within a unit area of fabric. The term “warp density” refers to the number of yarns in the lengthwise direction, while “weft density” refers to the number of yarns in the crosswise direction. Fabric density is typically measured using the Metric or British systems:
- Metric system: Yarn count per 10 cm of fabric.
- British system: Yarn count per inch of fabric (1 inch = 2.54 cm).
For example, a fabric density of 7865 per inch means there are 78 warp yarns and 65 weft yarns in one square inch of fabric. It is expressed as warp density: 78/inch and weft density: 65/inch. The combined density would be written as 7865.
Specification
Standards
GB/T 4668, ISO 7211.2
Weight
2 kg
Dimensions
97 x 53 x 35 mm (L x W x H)
Testing Method
Use Method of Fabric Density Glass
- Select the appropriate lens magnification based on the fabric count and install it in the eyepiece frame of the instrument.
- Choose the cursor glass color that contrasts well with the fabric color (one of three options is available).
- Position the instrument on the fabric to be measured, ensuring it is aligned parallel to the fabric’s warp and weft. Adjust the lens height for a clear view, then use the rotating knob to align the lens to zero.
- Visually count the number of warp and weft yarns within a unit length to determine the fabric density.
Fabric Density Glass Maintenance
- Keep the instrument clean at all times. Avoid touching the lens with hands or objects to prevent smudging or damage.
- Ensure the two screws at the bottom surface of the instrument are secure to avoid fabric movement during use. Always place the instrument carefully to avoid damage to the lens.
Magnification Levels
- 10x magnification for fabrics with a yarn count below 60.
- 20x magnification for fabrics with higher yarn counts.
