Design specifications for the dimensions of canopy connections and nodes
The connection nodes of the canopy include membrane-to-membrane connection nodes and membrane-to-support structure connection nodes. Depending on the support system, they can be categorized into membrane-to-flexible support structure nodes and membrane-to-rigid support structure nodes. Based on their location, they can be divided into intermediate nodes and boundary nodes. Second, the connection structure design of the membrane structure should consider factors such as the shape of the structure, load, fabrication, and installation conditions to accommodate possible displacements and rotations.
Assumptions made about nodes during shape design and load analysis should be consistent with the actual structure. The impact of various simplifications during calculation should be considered in node design and verification. The influence of structural installation deviations should be taken into account in node design. The connection nodes between the membrane and the support structure must have sufficient strength and stiffness, should not fail before the connected canopy components and membrane material, and should not cause deformations that affect load-bearing performance. Membrane connections should maintain high water tightness, undergo peel resistance testing, and prevent fabric wear and tearing. Metal components at the connections should have anti-corrosion measures. The connection structure should fully consider the effects of membrane material creep.

Sunlight Panel Product Characteristics:

(1) Light Transmittance: PC sunlight panels have a light transmittance of up to 89%, comparable to glass. UV-coated panels do not easily yellow, fog, or lose transmittance when exposed to sunlight. After ten years, the light transmittance loss is about 10%, while PVC loses 15–20%, and fiberglass loses 12–20%.
(2) Impact Resistance: The impact strength is 250–300 times that of ordinary glass, about 30 times that of acrylic sheets of the same thickness, and 2–20 times that of tempered glass. It is known as "unbreakable glass" and "resonant steel."
(3) UV Protection: One side of the PC panel is co-extruded with an anti-UV coating, and the other side has anti-condensation treatment, combining UV resistance, heat insulation, and anti-fogging functions. It blocks UV rays, making it suitable for protecting valuable artworks and exhibits from UV damage.
(4) Lightweight: The specific gravity is about half that of glass, reducing transportation, handling, installation, and support framework costs.
(5) Flame Retardant: According to standard GB50222—95, PC sunlight panels are classified as flame-retardant (B1 grade). The self-ignition point of PC panels is about 580°C, and they self-extinguish after being removed from fire. They do not produce toxic gases when burning and do not contribute to the spread of flames.
(6) Bendability: Can be cold-bent on-site according to design drawings to form arches, semi-circular roofs, and windows. The bending radius is about 175 times the panel thickness, and it can also be heat-bent.
(7) Sound Insulation: PC sunlight panels have significant sound insulation effects, outperforming glass and acrylic sheets of the same thickness in acoustic insulation. Under the same thickness conditions, the sound insulation of PC sunlight panels is 5–9 dB higher than that of glass. They are the material of choice for highway sound barriers.
(8) Energy Efficiency: Cool in summer and warm in winter, PC sunlight panels have a lower thermal conductivity (K-value) than ordinary glass and other plastics. Their heat insulation effect is 7–25% higher than that of glass, with up to 49% heat insulation, significantly reducing heat loss. Ideal for buildings with heating systems.
(9) Temperature Adaptability: PC panels do not become brittle at -40°C and do not deform at 125°C. Their mechanical and physical properties remain largely unchanged in harsh environments.
(10) Weather Resistance: PC sunlight panels maintain the stability of various physical indicators within a range of -40°C to 120°C. After 4,000 hours of artificial weathering tests, the yellowing degree is 2, and the light transmittance reduction is about 0.6%.
(11) Anti-Condensation: At an outdoor temperature of 0°C and an indoor temperature of 23°C with relative humidity below 80%, the inner surface of the material does not condense. Condensation flows along the surface of the panel without dripping.
Yongxin PC structural panel categories: General-purpose polycarbonate sheets (single-layer panels), single (double)-sided UV polycarbonate sheets, textured panels, frosted panels, transparent sound barrier panels, scratch-resistant panels, corrugated sheets, general-purpose sunlight panels (multi-layer panels), single (double)-sided UV sunlight panels, crystal-clear panels, anti-drip sunlight panels, easy-clean sunlight panels, anti-drip + easy-clean sunlight panels, sunlight panels, multi-layer sunlight panels, PC tiles. PC structural panel varieties: General-purpose single-layer panels, impact-resistant panels, transparent sound barrier panels, scratch-resistant panels, and weather-resistant multi-layer sunlight panels. Products are mainly used for canopies in various building spaces, daylighting greenhouses, highways, railway sound barriers, thermoformed skylight domes, etc.