Repair tape for ETFE film high-tech greenhouses (horticulture building)

The currently available films and structures, such as the Venlo wide span greenhouse, make high-performance, long-lasting film greenhouses a possibility. Covering a high-quality horticulture greenhouse with film cladding can also bring benefits when it comes to energy. EFTE’s high levels of transparency across the whole PAR range allow you to create conditions that are particularly “plant friendly”.

There are different classes of good-value PE-based films, depending on the envisaged purpose and length of use, as well as co-extruded films with functionalised layers and high-quality PVC films. If a particularly long lifespan is an important factor (lifespans of over 25 years are possible), then glass and EFTE film claddings (e.g. F-Clean® from AGC) are practically the only two options open to you.

The provisions of construction law and plants typical demands (e.g. UV) require the use of special types of glass, which, in turn, require an expensive frame due to their weight. EFTE films offer a number of benefits, which make replacing glass and high-quality PE composite films worthwhile:

  • Optimum use of solar energy (85-90% transparency)
    Tearproof, elastic and extremely resistant to hail
  • Provides great heat insulation when two or three layers are used ( < 3,5 W/m² for a greenhouse )
  • Creates savings when two or three layers are used, by reducing power consumption by over 30%
  • Can block IR radiation and provides shade where special equipment is used
  • Very light, meaning it is also suitable for retractable roofs and other large roof ventilation systems.
  • Can be used as a film curtain, making it possible to completely open up the greenhouse.
  • When used as a covering material, EPTE film falls into the B1 building material class (fire-resistant).
  • Also suitable for greenhouse structures that use a combination of glass and film to save energy (CO2 optimisation).
  • Extremely resistant to chemicals, cannot be damaged through contact with chemical sprays.
  • No undesired longitudinal growth, chlorophyll is similar to that in plants grown on open land.
  • Very good resistance even against sand and dirt for projects in dessert-like environments
  • No expensive ESG glass for overhead glazing necessary

    Regardless of the envisaged use of a film greenhouse (horticultural buildings) with ETFE covering, whether it’s for cultivating vegetables and ornamental plants, producing seedlings or for toughening up of plants, the film membrane can still get repeatedly damaged by accident. Strong gusts of wind and the abrasion of load-bearing parts can also cause damage to the film. Given that EFTE is extremely resistant to contamination (given that it is an anti-adhesive surface) it is difficult to repair with standard tape. The surface, which has properties similar to Teflon, prevents good adhesion.
    That is why, for many years, CMC Klebetechnik has been making a type of tape that is particularly effective in repairing ETFE film greenhouses/horticultural buildings. The tape consists of a 100µm strong EFTE film from Nowofol. This tape is extremely resistant to chemicals and ageing and adheres really well to almost all surfaces, as well as being resistant to infiltration (by rain, dew or condensation). You can also use the CMC 77700 / CMC 77701 EFTE tape for sticking on chafe marks that pose a particular risk, helping to maintain the durability of the film covering.

    The EFTE tape can also be used to repair membrane structures (double-layered covers with a film structure that is stabilised using compressed air), as it can cope with the shear stress placed on it during inflation.

    This tape from CMC Klebetechnik allows high-quality film greenhouses to be maintained for many years, with repairs being almost invisible. This makes perfect sense when you take the costs of EFTE film into account.

    Adhesive tape rolls are available
    from 5 mm to 500 mm in 50 m length.
    Other length is possible (2 m – 200 m).
    Shape of die cut or kiss-cut parts are flexible and can defined by the customer.(

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The fifth building material – Maintenance of ETFE constructions (maintenance des verrières gonflables en ETFE )

The ETFE is a modified copolymer which is extruded into a thin film. The material is ageing resistant, self-cleaning and transparent. It is unaffected by UV light, atmospheric pollution or weathering and extensive testing has shown an anticipated life expectancy in excess of 40 years (used e.g. for green house cladding). The material is self-extinguishing and it is resistant to normal hailstorms.

Single layer constructions are supported by a cable net. Cushions are formed from multiple layers of ETFE. The foil is extremely thin: each layer is between 50 and 300 µm thick, it enables very high levels of light transmission in both the visible (94-97%) and ultraviolet range (83-88%). Together with light weight perimeter frames it is easily possible to have buildings which appear like as they were built of not much more than air. Architectural roofing designs are revolutionized by these ETFE-films since many years now. Also greenhouses (horticultural and industrial) and wall coverings, anti-graffiti protection for high traffic areas and solar collectors are applications, ETFE is used for due to its excellent properties. ETFE has only 1% the weight of glass, is 100% recyclable and is self-extinguishing.

Despite these advantages of ETFE films there are some problems appearing according to the low thickness of the material. Usually cushions are stabilized by inflating with dry air. Especially on rooftops birds love to land there and peck at their food to break it up before swallowing. The bigger the bird the more powerful their pecking action will be. It is widely known that ETFE roofs and Canopies installed nearby or close to stages (e.g. Allianz Arena Munich) or the sea suffer most of this problem. This is because Ravens, Crows or Seagulls use the ETFE roof membranes as an ideal platform to stop and peck at food rubbish or shellfish, crabs and the occasional stolen chip. This often vigorous and powerful pecking action causes punctures and tearing to the ETFE Membrane, opening holes where the inflating air can leak. This causes higher operation cost or the possibility of fatal destruction of a complete cushion.

Fortunately the ETFE material is resistant to tear growth so that it is easy to repair such holes and tears on-site by using a special adhesive tape from CMC Klebetechnik. This transparent tape is made of the same material as the cushion itself: an 100µm ETFE-film. The adhesive sticks good to the cushion surface and is similar resistant to UV and weathering as the ETFE. It is resistant against creeping of water under the adhesive tape and elastic as the base material of the cushion.
This is why CMC 77700 ETFE adhesive tape is ideal for repairing of damages (minor tears or holes) or reinforcement e.g. under supporting cables of single layer constructions. No need to replace individual elements of a roofing construction can save a lot of money. And due to the transparency of the adhesive tape, repairs are nearly invisible. Maintenance with ETFE adhesive tapes from CMC Klebetechnik reduce costs, time and effort for repair.

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