multi-span connected film greenhouse,sawtooth-shaped film greenhouse and pe film greenhouse are economical and versatile structure designed for year-round cultivation, utilizing UV-stabilized polyethylene plastic as its primary covering material. Ideal for small farms, nurseries, and commercial growers, it provides effective weather protection while optimizing light diffusion for plant growth.
Multi-span Swatooth-shaped PE Film Greenhouse
1. Executive Summary of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
The Multi-span Sawtooth-shaped PE Film Greenhouse represents an advanced agricultural structure designed for commercial-scale production, combining superior ventilation capabilities with cost-effective polyethylene film technology. This 3000-word technical guide provides a complete analysis of:
Innovative architectural design principles
Advanced polyethylene film formulations
Precision environmental control systems
Structural engineering specifications
Commercial cultivation performance data
Developed through extensive agricultural engineering research, this greenhouse design delivers 40-50% better natural ventilation than conventional multi-span structures while maintaining the economic benefits of PE film coverings.
2. Architectural Design & Structural Engineering of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
2.1 Sawtooth Roof Configuration
Ventilation Geometry:
30° north-facing vertical ventilation plane
25° south-facing light capture plane
Continuous ridge vent spanning entire greenhouse length
Structural Advantages:
60% greater air exchange capacity
Reduced wind resistance coefficient (Cd=0.4)
Optimized light penetration (92% PAR transmission)
2.2 Multi-span Structural System
| Component | Specification | Performance Standard |
|---|---|---|
| Primary Columns | Galvanized steel (150×150×4mm) | ISO 1461 (85μm zinc) |
| Roof Trusses | Triangular space frame design | 60kg/m² snow load |
| Gutters | Aluminum alloy (0.8mm thickness) | 15L/m rainfall capacity |
3. Advanced PE Film Technology of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
3.1 Multi-layer Film Composition
5-layer Co-extruded Construction:
Outer: UV-stabilized LLDPE (50μm)
Middle: EVA bonding layer (20μm)
Core: Reinforced scrim (30μm)
Middle: IR-absorbing layer (25μm)
Inner: Anti-condensation surface (25μm)
3.2 Optical & Thermal Properties
| Parameter | Performance | Benefit |
|---|---|---|
| PAR Transmission | 91% | Optimal photosynthesis |
| Light Diffusion | 65% haze | Reduced plant stress |
| UV Blocking | 98% (280-400nm) | Extended film lifespan |
| Thermal Retention | 75% IR absorption | Night temperature stability |
4. Environmental Control Systems of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
4.1 Natural Ventilation System
Sawtooth Vent Operation:
Automatic vent openers (60° maximum angle)
Wind-direction responsive control
25 air changes per hour capacity
Supplemental Systems:
Side roll-up curtains (1.5m height)
Horizontal airflow fans (0.5m/s velocity)
4.2 Temperature Management
Passive Systems:
Thermal screens (R-value 2.1)
Water tube heat storage (200L/m²)
Active Systems:
Pad-and-fan cooling (30cm cellulose pads)
Hot air heaters (50,000kcal/h capacity)
5. Structural Performance Data of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
5.1 Load Testing Results
| Load Type | Capacity | Safety Factor |
|---|---|---|
| Snow Load | 75kg/m² | 1.5 |
| Wind Load | 130km/h | 2.0 |
| Hail Impact | 25mm diameter | 1.8 |
5.2 Durability Metrics
Film Lifespan: 5-8 years (UV-stabilized)
Structural Lifespan: 20+ years
Corrosion Resistance: 5,000 hour salt spray test
6. Agricultural Performance of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
6.1 Crop Production Results
| Crop | Yield Increase | Quality Improvement |
|---|---|---|
| Tomatoes | +35% | 20% higher brix |
| Cucumbers | +40% | 30% straighter fruit |
| Leafy Greens | +45% | Reduced tipburn |
| Flowers | +30% | Extended vase life |
6.2 Climate Control Performance
| Parameter | Control Range | Stability |
|---|---|---|
| Temperature | 10-32°C | ±1.5°C |
| RH | 50-90% | ±5% |
| CO₂ | 400-1500ppm | ±50ppm |
7. Installation & Maintenance of multi-span connected film greenhouse ，sawtooth-shaped film greenhouse and pe film greenhouse
7.1 Construction Process
Site Preparation (3-5 days)
Ground leveling (±2cm tolerance)
Drainage system installation
Structural Erection (10-15 days)
Column placement (0.5mm alignment)
Truss assembly (laser-leveled)
Film Installation (3-5 days)
Tensioned application (50kg/m tension)
Edge sealing (butyl tape)
7.2 Maintenance Protocol
Daily: Ventilation system check
Weekly: Film surface cleaning
Monthly: Structural inspection
Annual: Film replacement
