What better use of polycarbonate for greenhouses
currently produces monolithic and cellular polycarbonate dyed various thicknesses and transparent.The range of polymeric materials of this type is diverse.Consumers appreciate the high specifications and extensive use of polycarbonate for greenhouses.
In order to determine what is best for polycarbonate greenhouses, you must carefully examine the properties of both types of transparent plastic.At the same chemical composition, they have different structures and significantly differ in their specifications.The choice of the coating material for greenhouses is done in view of the requirements for the design of such facilities.
- What polycarbonate best for greenhouses - cellular or monolithic
- How thick polycarbonate is best used for greenhouses
- What color polycarbonate is better to choose for the greenhouse
- polycarbonateUV rays and without
- Comparative characteristics of popular manufacturers of polycarbonate
What polycarbonate best for greenhouses - cellular or monolithic
The main function of a greenhouse is to ensure the optimum temperature and humidity conditions required for growing crops in largevolumes.To solve this problem needed facilities spanning quite a large area.To erect this is possible only when using materials with a low specific weight, otherwise require robust and consequently heavy frame.
Well so it meets the requirements of polycarbonate, which has a hollow structure.In comparison with the monolithic material has a significantly smaller specific gravity with the same sheet thickness.Thus, one square meter of a 10-mm polycarbonate panels more than an order of magnitude better than the single sheet of the same chemical composition.Besides polycarbonate, due to its hollow structure it has a lower thermal conductivity.This circumstance is crucial in deciding on the choice of cover for greenhouses.
solid polycarbonate sheets.
And so we decided that the need for the greenhouse polycarbonate, but which one is best among what is presented in a wide range on the market?This coating is chosen on the basis of a set of various properties and characteristics, the list of which includes the following:
- mechanical strength;
- resistance to changing environmental conditions;
- thermal conductivity;
- light transmission;
- availability of protection against strong ultraviolet radiation.
Polycarbonate has high parameters on all the above items, the information about the technical characteristics of the panel is presented in the table:
|Panel thickness mm||4 6 8||10||16|
|The share||kg / m2||0,8||1,3||1,5||1,7||2,5|
|length and width of the sheet||m||2,10 × 6,00|
|minimum bending radius||m||0,8||1,3||1,5||1,7||2,5|
|Light transmission coefficient||%||82||78||75||72||62|
|Thermal conductivity W/ m2 ° C||3,6||3,4||3,0||2,7||2,0|
|Operating temperature||° C||-40 - +130|
|Max.||linear expansion mm / m 3|
Features polycarbonate depend on two main factors: the quality of raw materials and strict observance of production technology material.Production is carried out by extrusion panels using special equipment.Different manufacturers use the company distinguished by the properties of the raw material, and the structure of the material they may be different.
The above factors are taken into account when choosing a particular brand of polycarbonate for the construction of greenhouses.In addition to these parameters is critical cost panel, which depends on the thickness and quality of the sheet.Cheaper materials, usually made in violation of technical specifications and they are not capable of withstanding prolonged use.
How thick polycarbonate is best used for greenhouses
can choose the thickness of polycarbonate for covering greenhouses is affected by the following factors:
Step crates used for greenhouses
shape and angles of raysused greenhouses
Snow load and temperature conditions in the region
kind of culture that is planned to grow
The customer is often a temptation to get savingsand to get the thinnest and inexpensive sheet to cover greenhouses.This decision will lead to a need to increase the load-bearing frame members, to compensate for insufficient strength of the panel, which during operation is subjected to significant wind and snow load.Moreover, cheaper material often does not correspond to the stated thickness, which also contributes to its specifications.
should not go to the other extreme and be used for the construction of greenhouses polycarbonate maximum thickness.Four-thick panel with a complex structure of ribs, which greatly reduces the light transmission.In addition, a greater proportion of sheet also require strengthening of the supporting structure of the framework.
Experience shows that the optimum thickness of the coating of polycarbonate greenhouses amounts to 4 to 10 mm.It is important to consider that when choosing a panel should pay attention not only to the technical specifications, but also on the quality of the material.The latter must be confirmed by a certificate of conformity of the material requirements of the national standard issued by an accredited laboratory for a specific batch of products.
Recommended step crates for greenhouses of polycarbonate is 700 mm or 1050 mm, a step equal to half or a third of the width of the sheet and reduces material consumption.
dependence polycarbonate sheet thickness, the size of the cell crates greenhouses when snow load 180 kg / m:
arch When constructing greenhouses should also take into account the maximum possible bending radius of the material.This rate also depends on the thickness of material (see. The above table), but can vary depending on the manufacturer (see. Table below).
angle of slope of the roof will also have an impact on the required thickness of the sheet.But this figure is relevant only for pitched greenhouses.It is therefore often sloped wall greenhouses made of 4mm thick polycarbonate, but the roof of a thickness of 6 - 10 mm.Best of all in areas with high snow load to use greenhouses or teardrop-shaped arch, which do not contribute to the accumulation of snow on the roof of the greenhouse.
Snow load in various regions of the Russian Federation.
In regions with moderate snow load is most often used sheets of polycarbonate thickness 4 - 6 mm.
thickness of the material and depends on the purpose of the greenhouse.If the future of the greenhouse will be used for the distillation of seedlings, it is best to take the polycarbonate, 6 mm thick, but for the cultivation of early vegetables will be sufficient and 4 mm.
What color is best to choose polycarbonate for greenhouses
Manufacturers offer painted and fully transparent resin panel.When choosing colors for the construction of polycarbonate greenhouses consumer should come from two considerations.First of all, the coating should ensure maximum light transmission panels and lighting inside the building should be as close as possible to the natural solar spectrum.
therefore meet the requirements of transparent polycarbonate panels, which have the highest light transmission at the level of about 80%.At the same time sheets opal detain and dissipate up to 40% of sunlight and the bronze panels of the fashion color and do absorb up to 60% of the radiation.This circumstance adversely affect the plants and will prevent their normal growth and development.
Among other things, colored sheets have selective light transmission.The radiation of the spectrum that are necessary for their crops simply do not reach.This situation can not contribute to higher productivity.Experts recommend to be used as a transparent cover panel that allow you to make the most greenhouse light and warm.
polycarbonate with protection against UV radiation and without
During long-term operation in the transparent plastic to strong sunlight.The ultraviolet portion of the spectrum it is able to launch processes photovoltaic destruction, initially formed on the surface microcracks.Over time, they expand, which ultimately leads to fragility panel and its gradual destruction.
To protect against data processes on the outer layer of polycarbonate cellular applied a special coating.Coextrusion technology with mutual introduction of materials eliminates separation of the protective layer from the substrate.In most types of materials such coating is only on one side.In order to inform the user on the packaging film is applied to the label showing how to mount panels.
on certain types of polycarbonates photo stabilizing coating is applied to both sides of the sheet.Such panels are used for outdoor advertising structures and noise barriers that are set along the major roads near settlements.Their application for the erection of greenhouses does not make sense, since in this case the UV exposed to only one side.
Manufacturers also offer polycarbonate having no light-stabilizing layer.Such panels are used solely for internal work and not suitable for greenhouses.Destructive processes will lead to the destruction of the panel after one year of operation.For greenhouses it is recommended to use high-quality polycarbonate with a one-sided UV protection of famous trademarks.Generally such sheets are covered with a film in which there is a designation which side has a protective layer.
Purchase inexpensive material produced by the company, which has no name or does not have it, most likely, would mean a waste of money.Such plastics tend to serve no deadline, and it will have in the near future to change to a higher quality.When choosing polycarbonate for greenhouses should focus on their own financial opportunities and to avoid non-conforming products.
Comparative characteristics of popular manufacturers of polycarbonate
In the Russian market there are many kinds of clear plastic, made by domestic and foreign producers.Consider the most common brands of polycarbonate represented by different manufacturers.For ease of analysis of data in the article will be described bilayer panel thickness of 4 mm with ribs perpendicular to its surface.
One of the largest manufacturers of polycarbonate in our country, the company «SafPlast Innovative» markets its products under the brand name Novattro.Products of the company have worked well in the consumer and are in steady demand.
Bayer Material Science
Another manufacturer Bayer Material Science offers the consumer under the brand polycarbonate Makrolon.These products are high quality and has excellent performance.
Russian-Israeli company "Polygal" markets a polycarbonate cell under the same brand name.Relatively inexpensive and durable material with a long service life.
Products Chinese company «PlastiLux» brand Sunnex is classified as the most affordable materials and is popular with buyers.
Key Features Polycarbonate panels 4 mm thick listed manufacturers tabulated:
|Specifications||Unit.rev.||manufacturer and brand|
| SafPlast |
| Bayer |
|Polygal|| PlastiLux |
|distance between the ribs||mm||6 6||5,8||57|
|Specific gravity kg / m 2||0,75||0,8||0,65||0,79|
|minimum bending radius||mm||750 700 800||700|
|thermal resistance||M2 ° C / W||5,8||46||2,56||3,9|
From the information we can conclude that the alleged characteristics of the material from different manufacturers are approximately at the same level.Practice and study of customer feedback, at the time, bought some form of polycarbonate shows the following:
1. the cheapest brand Sunnex panels are not more than 3 - 4 years, with the declared useful life of 8 years.
2. Polycarbonate from "Polygal East" provides the immutability of its characteristics for about 10 years when properly installed.This material is sufficiently hard and durable, during the installation takes the form of a good frame.
3. panels «Novattro» from the Russian manufacturer SafPlast proven themselves on the positive side.Affordable price with a maximum term of operation of not less than 8 years.
4. highest specifications from polycarbonate honeycomb brand Makrolon.According to the results of operation in the middle zone it maintains the integrity of the sheet and the main properties for at least 12 years.
In view of the above, we can confidently assert that the products of the Chinese company has the shortest life, and the German pane - the longest.
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