Multi-Span Plastic Film Greenhouse Tunnel

1.Product Overview

Multi-Span Plastic Film Greenhouse Tunnel,also known as gutter-connected polytunnel greenhouse,consists of multiple single arched plastic tunnels connected side by side with shared galvanized drainage gutters.Different from separate small single tunnels,it forms one large continuous enclosed planting space.

The whole structure is built with hot-dip galvanized anti-rust steel pipes,covered with agricultural plastic film(PO/PE/double-layer inflatable film).It integrates low construction cost,easy installation and full climate regulation functions.The large interior space allows mechanized farming and matching with a full range of automatic supporting equipment.This tunnel greenhouse is globally popular for mass production of vegetables,flowers,seedlings and hydroponic crops.

2.Main Structure

2.1 Galvanized Steel Frame

Material:Hot-dip galvanized round steel pipe,anti-corrosion passivation treatment,service life over 15 years.

Standard sizes:Single span 6m,8m,10m,12m;ridge height 2.8–5m;column spacing 3–4m;pipe wall thickness customizable.

Load design:Capable of resisting strong wind and snow load,suitable for plains,coastal and hilly regions.

Gutter system:Integrated rain gutters between tunnels to collect and drain rainwater centrally,prevent leakage and waterlogging.

2.2 Plastic Film Covering

PO Film:High light transmittance≥90%,long-lasting anti-fog&anti-drip,anti-UV aging,service life 3–5 years.

PE Film:Economical choice,light transmittance 82%–88%,service life 2–3 years.

Double-layer inflatable plastic film:Adds air insulation layer,reduces winter heating energy consumption for cold zones.

All plastic films soften sunlight to avoid crop sunburn and cut condensation-induced plant diseases.

3.Optional Automatic Supporting Systems

All equipment can be configured separately or connected to an intelligent PLC control cabinet:

Cooling system:Exhaust fan+cooling pad

Ventilation system:Electric top&side roll-up film ventilation

Shading&insulation:External sunshade net,internal thermal screen

Irrigation system:Drip irrigation,sprinkler irrigation,water and fertilizer all-in-one machine

Auxiliary devices:Heating equipment,CO₂generator,seedling beds,environmental sensors

4.Core Advantages

Higher land utilization rate

Shared gutters and side walls eliminate gaps between single tunnels,land utilization rate above 85%.

Stable growing microclimate

Large continuous tunnel space avoids sharp temperature fluctuations;temperature,humidity and light stay uniform for consistent crop growth.

Support mechanized operation

Wide unobstructed tunnel interior enables tractors,transplanters and picking trolleys to move freely,saving labor cost for large-scale planting.

Low investment&easy maintenance

Plastic film and steel frame cost far less than glass or PC sheet greenhouses;film replacement is simple and low-cost.

Flexible customized design

Tunnel span,height,total length and supporting equipment can be adjusted according to local climate,land area and customer budget.

5.Application Range

Commercial vegetables:Tomato,cucumber,pepper,leaf greens,melons

Cut flowers and potted ornamental plants

Fruit and vegetable seedling breeding

High-value fruits:Strawberry,grape

Hydroponic soilless cultivation factories

Sightseeing picking gardens and agricultural demonstration bases