Introduction
This invention features a gauze and a gaupage retraction mechanism consisting of a main pipe, a spring box, a shaft support, an inner shaft, and an end seat. It functions as a standard screen window, allowing users to adjust both the glass window and the screen window opening as needed. When the glass window is opened, the gauze expands along with it to cover the open area. When the glass window is closed, the gauze is wound back onto the inner shaft and stored inside the main tube, thanks to the spring force of the retraction mechanism. This design saves space and does not interfere with the window's function. The product offers an elegant appearance, with the screen either visible or hidden depending on the window’s operation. It is easy to install and remove, making it an ideal choice for sliding windows.
Invisible screens are not truly "invisible." Their design relies on materials with extremely fine wire diameters (measured in thousandths of a millimeter) and high light transmittance (up to 96%). The effect is similar to having no screen at all. To achieve this, the material must have high tensile strength, transparency, corrosion resistance, weather resistance, stability, and a low refractive index. Transparent monofilament is essential, and the weave density should be high enough to create a diffraction effect, producing a "soft white" appearance. Additionally, chemical coatings can enhance light transmittance and improve performance.
Common window screens are typically made from glass fiber yarn, polyester yarn, or Taiwan SPL yarn. Both glass fiber and polyester are plain weave, and currently, we use flat-woven glass fiber yarn available in black, gray, and off-white. Black is more common in the north, while gray is more popular in the south. However, black yarn is stronger due to the addition of carbon black during production, which acts as a stabilizer and improves adhesion between PVC and fiberglass. Polyester yarn has high strength but lacks fire resistance and is banned in some cities like Beijing. Taiwan SPL yarn is twisted and the strongest among these options, but it is expensive and still not fireproof. Although some people use it for home decoration, it is unsuitable for large-scale projects.
Nailless Installation
There are two main installation methods for invisible screens on the market: flat type and push-pull type. The flat type is fixed using straight buckles and cannot be moved, while the push-pull type is mounted directly on the slide rail and can be moved along it. The window’s opening type determines the installation method. Nail-free invisible screens are installed using high-strength double-sided tape and glass glue, ensuring a secure fit without damaging the window. This method is simple and widely used by manufacturers, but it is not recommended for high-rise buildings due to the risk of falling, which could cause injury or property damage.
Professional Knowledge
1. When purchasing invisible screens, pay attention to the profiles. The market mainly offers aluminum alloy and plastic steel. Plastic profiles are commonly used in engineering applications and last about one year. Aluminum alloy profiles are divided into engineering and home-use types. Engineering-grade screens last around four years, while home-use ones can last up to six years. Note that this refers to partial damage, not complete failure.
Suggestion: When choosing screen doors and windows, check the strength of the aluminum alloy. Thickness and hardness vary significantly, so it's important to select high-quality materials.
2. Bearing Differences: Bearings come in domestic and imported varieties.
Recommendation: In areas with high wind and sand, such as Beijing, domestic open bearings may become clogged with dust and lose smoothness. Therefore, it's better to choose imported fully enclosed silent bearings.
3. Spring Selection: Springs are categorized into those for windows and doors.
Suggestion: Since it's an invisible accessory, test the rewinding effect after installation. If the rewinding is too slow, it might be a window spring rather than a door spring.
4. Gauze Differences: Gauze comes in glass fiber mesh and polyester-coated chemical fiber mesh.
Recommendation: Glass fiber mesh is the most popular option due to its flame resistance, durability, and environmental friendliness. High-quality glass fiber gauze from Tianjin is known for its superior quality, though it is more expensive than Hebei products. Quality can be assessed by checking if the holes are even, the color uniform, and the surface smooth. Glass fiber gauze typically lasts over eight years, although frequent dust accumulation may shorten its lifespan. Polyester-coated mesh is used for folding screens and is lightweight, but it tends to deform within three to four years.
5. Screen Design: Due to modern windows being tall and narrow, using screen windows can be inconvenient. For example, high pull points require more effort, and strong winds may blow the gauze out. Magnetic strips may also fail to rewind automatically.
Recommendation: If your window height exceeds 1.4 meters, request a side-pull design when ordering. This makes usage easier and reduces stress on the screen components, helping to avoid malfunctions during the warranty period.
6. Screen Door Design: Since the lower track is often stepped on, ensure the screen door has an anti-tread design.
Recommendation: For screen doors wider than 1.2 meters, install two doors. This ensures smoother retraction and prevents issues caused by one-sided pulling.
7. Color of Doors and Windows: In Beijing, where window colors are diverse, pay attention to the color quality after purchase. Check for fading or peeling. High-quality invisible screen doors from major manufacturers use electrostatic powder coating, which is baked for durability. This process matches well with existing doors and windows and avoids color mismatch.
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