Greenhouse covers
Before the creation of greenhouses, agricultural methods were limited by weather conditions. According to the climate zone, people were limited to a select range of species and times of the year in which they could plant plants. However, around 30 AD, the Roman Empire has the first recorded attempt to build an artificial environment. Due to the illness of Emperor Tiberius, the royal doctors recommended that the emperor eat a cucumber daily. Given that cucumber
They are delicate summer plants and do not grow easily throughout the year. Therefore, the Romans designed an artificial environment like a greenhouse so that cucumbers are available to the emperor throughout the year. Cucumbers were planted in wheeled carts that were exposed to the sun every day and then moved to a warmer place at night to keep them warm.
The next biggest development in greenhouse design came from Korea in the 15th century during the Joseon Dynasty in the 1450s. These greenhouses were the first active greenhouses that did not rely solely on the sun’s heating system and could heat and humidity through a node heating system. create a name called Andole.
The main concept of the greenhouse appeared in the 17th century in the Netherlands and then in England, where providing adequate and balanced heat was considered one of its most serious problems. The first greenhouse equipped with a heater was established in the Chelsea Physic Garden in England in 1681.
Greenhouses provide the possibility of harvesting more than once a year. One of the best covers to protect these environments is plastic greenhouse covers (greenhouse nylons) Semanplast (Parse) with the ability to produce all types of these nylon covers up to 16 meters wide in different grades and also different additives, nylon It provides different lifespans based on thickness and other additives and according to the intended application (flowers, vegetables, fruits, traditional agriculture, hydroponic agriculture, geothermal application and place of use).
Technical specifications (greenhouse covers)
order delivery
10 working days
Minimum order quantity: 2000 kg
Packing: nylon, sack
General characteristics of greenhouse covers
Film thickness: 180-220 microns
Film width: 4-16 meters
Raw materials: light polyethylene, plus linear light polyethylene
Additives: EVA, Anti UV, Anti-block, PPA, IR,
Color: green, lemon, red and…
standards
INSO 21558-1
DIN EN 13206:2015
NF T 54-192:2011
KS M 3503:1992
| order delivery | General characteristics of greenhouse covers | standards |
|---|---|---|
|
10 working days Minimum order quantity: 2000 kg Packing: nylon, sack |
Film thickness: 180-220 microns Film width: 4-16 meters Raw materials: light polyethylene, plus linear light polyethylene Additives: EVA, Anti UV, Anti-block, PPA, IR, Color: green, lemon, red and… |
INSO 21558 – 1 DIN EN 13206:2015 NF T 54-192:2011 KS M 3503:1992 |
Additives capability of greenhouse nylons
Thermal covers EVA + IR
benefits :
- Protection against freezing and low temperature
- Milder temperature drops and generally higher night temperatures
- Reducing energy consumption for heating
- Higher product performance
- Early harvesting of products
- High quality of manufactured products
Non-thermal coatings
In areas with strong sunlight, when the weather is hot or the growth of crops requires shade, the interior of the greenhouse must be cooler than the outside, for this purpose, greenhouse nylons with a cooling effect can be produced in cement plastic, which are The mechanism of sunlight reflection, absorption and refraction prevents the increase of the internal temperature of the greenhouse during the day. Greenhouse covers with a cooling effect warm up later in the morning than greenhouse covers without this addition.
Anti-fog coatings
This additive helps reduce the fogging problem known as a side effect of greenhouse coatings at sunrise and sunset that occurs in coatings where an anti-drip additive is used. The anti-fog additive has a negative effect on the efficiency and effectiveness of the anti-drip additive, and as a result, it reduces the efficiency and shortens the effectiveness period of the anti-drip additive.
Anti-drip coatings
The space inside the greenhouse is humid, and its humidity increases with transpiration in the plants and evaporation of water from the soil surface. Whenever the particles in the greenhouse hit a cold object, they turn into liquid water. Due to the large temperature difference between the inside and outside of the greenhouse. , which usually has a higher temperature inside the greenhouse than outside, there is a high possibility of water droplets forming on the inner part of the greenhouse covers. These water drops, in addition to increasing the light reflection from the surface of the cover, lead to a decrease in the light transmitted into the greenhouse. Also, water dripping on the plants increases the possibility of diseases or reduces the quality of the products by causing stains.
In addition to that, the increase in the amount of drops can cause an increase in soil moisture and, as a result, plant suffocation or the occurrence of soil-borne diseases. In anti-drip coatings, water condensate is placed as a continuous layer on the inner surface of the coating and forms A narrow stream is directed to the sides of the greenhouse, but in the covers that do not have this feature, small drops join together and form large and heavy drops that drip on the plant due to the weight of the cover.
One of the most effective parameters in the dripping of water droplets is the slope of the greenhouse roof.
benefits :
- More light in the greenhouse
- Higher product performance
- Early withdrawal
- Better product quality, higher commercial value
- Fewer diseases
- Reducing the need for pesticides
Sunlight Diffusion (LD) Coatings
The coatings that are produced with this additive by Semanplast Parse company, in addition to allowing a lot of light into the greenhouse, cause more light to diffuse or fog the light inside the greenhouse. These covers can reduce the direct radiation of light and cause a more uniform distribution of light in the entire greenhouse and finally cause a more uniform growth of the plant, increase the quality and yield of the product and reduce burns in the plants. Light diffusion is the percentage of vertical incoming light that deviates more than 2.5 degrees from a straight line. This additive can diffuse between 40 and 70 percent of sunlight depending on the type and thickness of the produced films. The light diffusion index in completely transparent glass, which does not diffuse light at all, is zero percent. The combination of the amount of direct transmitted and diffused light from a greenhouse cover depends on the type of product, weather conditions, and plant growth stages.
Pest control coatings (AV)
This additive blinds insects in the greenhouse, such as whiteflies and leaf beetles, thereby inhibiting fungal or viral growth. It increases efficiency, increases product quality and minimizes the need for pesticides. Antivirus is only effective when the film thickness is more than 100 microns.
Films with the ability to select the passage of the light spectrum (UV-A and UV-B)
Radiation below 400 nm is called ultraviolet (UV). It is invisible to the human eye and is not used by plants for photosynthesis, however, due to its effect on anthocyanin formation, it is important for photomorphogenesis and for the coloring of some fruits and flowers. In particular, it is essential for salad reds and some varieties of roses that require intense UV light to develop their characteristic color. Semanplast offers UV-A and UV-B transmissive films that allow the full spectrum of UV-A and UV-B rays to enter the greenhouse. Apart from their use to enhance the color of red salads and certain types of roses, UV-A and UV-B transmissive films are often preferred in red fruits and other crops to achieve stronger plants and better rooting. be. Since this is very product specific.
Anti-dust covers (A Dust)
This additive makes the dust attached to the outer surface of the plastic easily removed with the help of wind and rain. Therefore, the light transmission from the greenhouse cover will remain high for a long time, thus increasing the efficiency and quality of the products.
