RHINO PLASTICS is the sole importer and supplier of PLASTIKA KRITIS greenhouse films in South Africa and most African countries. Plastika Kritis is one of the first companies worldwide that have invested in 7-layer technology for wide agricultural films, having foreseen the advantages that this technology can provide for the development and production of specialized films. Plastika Kritis greenhouse films combine long life time, superior strength and high light transmission with other, optional, characteristics that transform the film to an active contributor to plant protection, growth and productivity.
Rhino Plastics has a full range of greenhouse structures available. We represent ULMA AGRICOLA from Spain, with over 35 years experience, ULMA Agrícola is a company with a vast experience in manufacturing and developing greenhouses. We collaborate with agricultural producers offering them a comprehensive solution for their crops and assisting them in their projects from start to finish. We also work closely with certain greenhouse tunnel manufacturers within South Africa to meet our customers requirements.
Rhino Plastics has a wide range of greenhouse accessories, ranging from floor plastics to shading agents. Please contact our office for more information.
PLASTIKA KRITIS offers special thermic films, containing a combination of EVA and Infra-Red additives skilfully structured in the layers of the films, which absorb the Infra-Red radiation and reduce heat losses during the night.
Light from the sun passing through a greenhouse film and entering a greenhouse is split into direct light and diffused light. It is now generally accepted that diffused light has a positive effect on plant growth, especially for spring and summer crops and in areas with strong sunlight. Light diffusion causes a film to look hazy to human eye, however this doesn’t mean that the film is less transparent.
PLASTIKA KRITIS has the know-how and produces films with more or less diffusion, according to the specific requirements of each area and crop:
The choice of the most appropriate level of diffusion depends on the climate of the area, the crop and the season(s) of growing.
Droplets formed at the inside surface of greenhouse films due to water-condensation have negative consequences on plant quality and growth, as they reduce light-transmission by 15-30% and increase the incidence of certain diseases.
PLASTIKA KRITIS is manufacturing “anti-dripping” films that contain special additives which eliminate droplets and form instead a continuous thin layer of water running down the sides.
Anti-dripping films, when used properly, offer the following benefits:
Important note: Anti-dripping films are mainly recommended for well ventilated and/or heated greenhouses, with adequate inclination of the roof. The “anti-dripping” effect lasts for up to 2 years.
Under certain circumstances there is mist (fog) formation in greenhouses covered with anti-dripping films. Such mist usually occurs at sun-set and dawn and is undesirable as it could cause damages to the plants.
To allow the use of anti-dripping films, with all their benefits, without fear of the mist that is sometimes formed during sun-set and dawn in greenhouses covered with such films.
PLASTIKA KRITIS has developed anti-dripping films with a special anti-mist function that reduces the formation of mist.
Note: Due to the complex mechanism of its activity and to the variety of parameters affecting its performance, PLASTIKA KRITIS does not provide a warranty nor assumes any liability on the effectiveness and duration of the anti-mist effect.
In many areas of the world there is growing requirement for films that cut-down excessive heat during day-time and maintain a cooler environment in the greenhouse.
In areas with strong sunlight and hot weather as well as in nurseries and for shadow-loving ornamental plants, the “cooling effect” is becoming more and more a requirement.
PLASTIKA KRITIS offers special types of films, which reflect and/or absorb the Near Infra-Red (NIR) Radiation, a the part of solar spectrum which is useless for plants growth but carries most of the heat entering a greenhouse, thus reducing the heat inside the greenhouse during day-time.
It has been demonstrated that the higher the outside temperature, the larger the temperature reduction achieved with “cooling” films.
PLASTIKA KRITIS’ range of “cooling” films includes:
Note: after cold winter nights, temperature rise in the morning may be a little slower under “cooling” films than under conventional PE films.
PLASTIKA KRITIS has developed a range of special disease control films, which contribute efficiently in “Integrated Pest Management” and help to reduce the usage of pesticides.
An important type of disease and insects control films is “UV-blocking” films, which absorb UV-radiation up to 380 nm, thus achieving:
Note: “UV-blocking” films should be used after prior testing when bumble-bees are used as pollinators or when growing eggplants or other purple flowers or crops.
The plastic film alone may not control diseases, it can, however, contribute to their control, when used in conjunction with other suitable methods.
PLASTIKA KRITIS offers a range of special films incorporating selected additives and pigments to modify the light spectrum entering the greenhouse, thus changing the growth behavior of plants (photosynthesis and photomorphogenesis).
By using such films it is possible to increase the yield, to promote or retard the growth and to cause elongation or dwarfing of the stems.