Zhenfei Easylift Sping Shades Update：Coil for Large, Leaf for Narrow

The US, Canada, and the EU have mandated cordless window coverings — the era of corded curtains is ending. Meanwhile, minimalist aesthetics are driving global demand for sleek, cordless designs.Manufacturers face a dilemma: coil springs require complex tuning and risk force decay during shipping; leaf springs become costly at large sizes and suffer from noise issues. Zhenfei today unveils the upgraded Hand-Lift Cordless Curtain Dual-System, combining coil and leaf spring technologies to cover every order size — solving tuning, shipping, noise, and cost challenges in one move.Coil Spring: Pre-tensioned + Auto-Lock — No Tuning, No Shipping DecayZhenfei tackles the two biggest headaches of coil springs with proprietary engineering:First, factory pre-tensioned — zero on-site tuning. Each unit is precisely matched to size and weight at the factory. Workers assemble directly with no tuning required. Rework rate drops from the industry average of 15% to ＜1% — eliminating training costs and return risks.Second, auto-locking device — shipping-proof. A limit clip secures the spring after pre-tensioning, preventing force release during transit. Once inserted into the roller tube at the assembly site, the spring activates instantly. Test data: ＜1% force decay after 30 days of static load (industry average: 8%-12%). Vibration, stacking pressure, and temperature changes — none affect spring precision.Third, heavy-load capacity for large windows. Coil springs are inherently suited for large dimensions. Tested at extreme size: 6.5kg support at 2.4m × 2.5m; standard 1.8m windows handled by a single spring rod at 4.2kg with no auxiliary parts. 10,000 cycle life (≈6.8 years) · Zero noise.Leaf Spring: Modular Assembly + Noise Reduction — Purpose-Built for Narrow WindowsLeaf springs cannot handle large sizes — that's physics, and Zhenfei doesn't pretend otherwise. But in the small-size segment, we maximize their strengths:First, Lego-style modular assembly — zero training required. Standardized components combine to fit any size, with intuitive, plug-and-play operation.Second, optimized structure for quieter performance. Built-in spring mechanism reduces operating noise — noticeably quieter than comparable products, enhancing the premium feel.Third, covers segments coil springs can't reach. Ultra-narrow windows from 30-60cm width, or height-restricted small windows — leaf springs are the only solution. 3,000-5,000 cycle life (≈2-3.4 years).