Fabric Light Transmittance Testing Machine
The Fabric Light Transmittance Testing Machine is designed to measure the visible light transmittance of fabrics and evaluate their light-blocking performance. It is suitable for flat textile materials, including curtain fabrics and other sheet textile products. The instrument uses a light source and an illuminance measurement system to compare illuminance with and without a specimen, helping manufacturers and laboratories assess fabric light transmission.
The instrument also supports spectral transmittance measurement within the visible wavelength range of 380–780 nm, making it suitable for textile research, product development, and quality inspection.
Application
(1) Curtain fabrics used in residential and commercial buildings.
(2) Drapery fabrics requiring evaluation of visible light transmission.
(3) Sheet textile materials used in interior decoration.
(4) Textile materials developed for light-blocking applications.
(5) Quality inspection of textile materials during production.
(6) Research and development of fabrics with different light transmission properties.
The test results can support material selection, product development, and quality control in the textile and home furnishing industries.
Standards
(1) JIS L 1055:2009 — Testing Methods for Light Blocking Effect of Curtain Materials. The Japan Standards Association lists this standard as valid, with its latest confirmation recorded in October 2023.
(2) FZ/T 01009-2008 — Textiles — Determination of the Luminous Transmittance of Fabrics. This textile industry standard specifies a method for measuring the total visible light transmittance of flat textile products over the 380–780 nm wavelength range.
(3) GB/T 42999-2023 — Household Textiles — Determination of Light-Blocking Properties of Fabrics by the Illuminance Meter Method. This standard is listed as current by China's National Public Service Platform for Standards Information and took effect on April 1, 2024.
Parameters
| Parameter | Specification |
|---|---|
| Product Name | Fabric Light Transmittance Testing Machine |
| Test Purpose | Measurement of visible light transmittance of fabrics |
| Light Source Power | 1000 W |
| Power Supply | 220 V |
| Light Intensity Adjustment Range | Ambient light level to approximately 20,000 lx; exact lower limit to be confirmed |
| Illuminance Meter Range | 0.01–999,900 lx |
| Illuminance Meter Accuracy | ±5% |
| Spectral Measurement Range | 380–780 nm |
| Wavelength Scanning Interval | Selectable; specific intervals to be confirmed |
| Light Path Configuration | Dual-beam optical arrangement |
| Parallel Beam Deviation Angle | Not more than 5° |
| Sample Holder | Designed to hold the specimen without tension |
| Integrating Sphere | Equipped
with an optical port and photodetector, as described in the supplied
specifications |
Test principle
1. A light source (light bulb) is illuminated, and the light is irradiated to the photodetector of the illuminance meter;
2. Adjust the brightness of the light source to 10,000 (1X);
3. Determine the illuminance of the sample;
1: illuminance (lx) after installation of the sample; I0: no illumination of the specimen (I1: I1 / I0) × 100%, I1: Lx).
Main feature
1, with the determination of spectral transmittance function.
2, with the mouth and the photon detector integral ball.
3, with an optical device capable of generating a double beam.
4, two parallel beam of light and its beam axis of the incident angle of not more than 5 °.
5 has a function of scanning at a desired wavelength interval in the wavelength range of 380 nm to 780 nm.
6, with the sample in the tension-free state to keep the sample folder.
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