The reason why the tarpaulin of the side curtain trailer can achieve "no water droplets and no dust particles enter" is due to the triple protection system of **material + structure + process**:
1. "Three protections" of the material itself
- PVC coated polyester fiber: The surface is high-density PVC, the film thickness is ≥0.7 mm, and the hydrostatic pressure is ≥3000 mmH₂O, which is equivalent to no water seepage in 2 hours of continuous heavy rain.
- Dust-proof particle layer: The outer surface of PVC is covered with a layer of "lotus effect" treatment, dust cannot adhere, and light rain can wash away floating dust, reducing manual cleaning.
- Mold-proof and flame-retardant: Mold-proof and flame-retardant are added to the coating, and it will not mold or self-ignite in a humid environment.
2. Structural "two gates"
1. Top fringe + water channel
The width of the roof cloth is greater than the width of the car body, and 10-15 cm more is added on both sides to form a "fringe", and rainwater is directly discharged; the top rail has a hidden water channel to guide the seepage to the rear of the car.
2. Side curtain pressure frame + sealing strip
The lower edge of the curtain uses an aluminum alloy pressure frame + EPDM rubber sealing strip to form a "bite" seal with the bottom plate of the car body, and dust particles larger than 0.5 mm cannot enter.
3. Process "seamless heat sealing"
- The entire curtain cloth has no pinholes, and the seams are **high-frequency heat-sealed** (temperature 200 ℃, pressure 0.6 MPa), and the weld strength is ≥ 85% of the parent material, eliminating water seepage from traditional sewing holes.
- Stainless steel tensioners are installed around the periphery, and the curtain cloth continuously maintains a tension of more than 30 kg, and no flapping gaps are generated in heavy rain and strong winds.
To sum up in one sentence: Side curtain tarpaulin = "PVC raincoat + sealed zipper + water-conducting eaves", the trinity achieves **rainstorm-level waterproofing and industrial-grade dustproofing**.