Working principle of folding: collect gauze through its folds (like an accordion). Some people like to use mosquito-repellent incense or electric mosquito-repellent incense, while others like to use spray. In any case, using invisible screen window is the most natural, healthy, environmentally friendly and economical way. Invisible screen window can not only prevent mosquitoes, but also prevent outdoor dust from entering the home, thus protecting our health. A certain amount of gauze is wound in a container by using a torsion spring roller shutter mechanism, which can be pulled out when in use and retracted when not in use, thus preventing mosquitoes and flies from entering and leaving, and is a beautiful and practical screen window. Invisible screen window is not invisible in the true sense. The design principle of invisible screen window is only that the material line diameter is extremely thin (one thousandth of a millimeter) and the light transmittance is extremely high (96%). Without careful observation, it seems that there is almost no screen window: the material that can be used to make invisible screen window requires high tensile strength, transparency, corrosion resistance, weather resistance, stability and low refractive index. Transparent monofilaments must be used. The weaving density is high, which can form the diffraction phenomenon of light and form "high-grade white". A chemical coating that increases light transmittance. Gauze can be rewound automatically.