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CUCUMBER

Still unconvinced about the light transmission through a SLS 10 ULTRA PLUS energy screen?


It has been proven that a movable energy screen makes it possible to reach substantial energy savings. But at Svensson, we know that while saving energy is important, it is not necessarily more important than achieving the maximum possible light transmission into the greenhouse. That is why we developed the SLS 10 ULTRA PLUS.

We take a step further with this new energy screen. Figures such as 88% direct and 81% diffuse light transmission say a lot. What says even more, for example, is the saving of 15 cubic metres of gas per square metre for pepper, tomato and cucumber growers.

Of course, using an energy screen requires a different growing strategy. Or, to put it another way, requires experimentation with light, temperature and humidity levels. Sufficient knowledge about these aspects is now available, certainly at Svensson.

We are happy to help you get started. This is a technical breakthrough with many details that may not all be addressed here. If you would like to know more, we or your installer would be happy to provide you with more information.

The most frequently asked questions about SLS 10 ULTRA PLUS.

  1. How about light transmission?
    Excellent: the direct light transmission is 88%, the diffuse light transmission is 81%. That is an impressive 6% more than this screen's predecessor, the SLS 10 ULTRA, and no less than 9% more than alternative screens. Consequently, the screen can remain closed during the day at the start of the season.
  2. How many cubic metres of gas can I save annually using the SLS 10 ULTRA PLUS?
    With normal use, you can easily save 15 cubic metres of gas per square metre.
  3. Does the SLS 10 ULTRA PLUS comply with the requirements of the Enhanced Capital Allowance Scheme?
    Yes.
  4. What is the story with the water vapour transmission of this screen?
    Thanks to the special knitted structure, SLS 10 ULTRA PLUS is able to breathe. This allows excess water vapour to pass through, without letting the air humidity drop too low at the start of the season.
  5. How prone is it to becoming dirty?
    Minimum condensation prevents algae growth and the screen remains clean for a long time.
  6. Is the SLS 10 ULTRA PLUS flexible enough?
    Yes, thanks to its knitted structure, the screen easily folds up into a small package, minimising shading as much as possible.
  7. How long does the screen last?
    SLS 10 ULTRA PLUS is resistant to UV, heat and chemicals, so it lasts a very long time - longer than other types of fabric with normal use.
  8. Can the SLS 10 ULTRA PLUS be used as a solar reflection screen?
    Yes, thanks to the light diffusing properties of the material, bright sunrays are blocked, so you prevent plant stress.
  9. So what are we waiting for?
    Right you are. Contact your installer or us to get to know the most translucent energy screen around: THE SLS 10 ULTRA PLUS.

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PEPPER

Still unconvinced about the light transmission through a SLS 10 ULTRA PLUS energy screen?

It has been proven that a movable energy screen makes it possible to reach substantial energy savings. But at Svensson, we know that while saving energy is important, it is not necessarily more important than achieving the maximum possible light transmission into the greenhouse. That is why we developed the SLS 10 ULTRA PLUS.

We take a step further with this new energy screen. Figures such as 88% direct and 81% diffuse light transmission say a lot. What says even more, for example, is the saving of 15 cubic metres of gas per square metre for pepper, tomato and cucumber growers.

Of course, using an energy screen requires a different growing strategy. Or, to put it another way, requires experimentation with light, temperature and humidity levels. Sufficient knowledge about these aspects is now available, certainly at Svensson.

We are happy to help you get started. This is a technical breakthrough with many details that may not all be addressed here. If you would like to know more, we or your installer would be happy to provide you with more information.

The most frequently asked questions about SLS 10 ULTRA PLUS.

  1. How about light transmission?
    Excellent: the direct light transmission is 88%, the diffuse light transmission is 81%. That is an impressive 6% more than this screen's predecessor, the SLS 10 ULTRA, and no less than 9% more than alternative screens. Consequently, the screen can remain closed during the day at the start of the season.
  2. How many cubic metres of gas can I save annually using the SLS 10 ULTRA PLUS?
    With normal use, you can easily save 15 cubic metres of gas per square metre.
  3. Does the SLS 10 ULTRA PLUS comply with the requirements of the Enhanced Capital Allowance Scheme?
    Yes.
  4. What is the story with the water vapour transmission of this screen?
    Thanks to the special knitted structure, SLS 10 ULTRA PLUS is able to breathe. This allows excess water vapour to pass through, without letting the air humidity drop too low at the start of the season.
  5. How prone is it to becoming dirty?
    Minimum condensation prevents algae growth and the screen remains clean for a long time.
  6. Is the SLS 10 ULTRA PLUS flexible enough?
    Yes, thanks to its knitted structure, the screen easily folds up into a small package, minimising shading as much as possible.
  7. How long does the screen last?
    SLS 10 ULTRA PLUS is resistant to UV, heat and chemicals, so it lasts a very long time - longer than other types of fabric with normal use.
  8. Can the SLS 10 ULTRA PLUS be used as a solar reflection screen?
    Yes, thanks to the light diffusing properties of the material, bright sunrays are blocked, so you prevent plant stress.
  9. So what are we waiting for?
    Right you are. Contact your installer or us to get to know the most translucent energy screen around: THE SLS 10 ULTRA PLUS.

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TOMATO

TOMATO GROWERS: Still unconvinced about the light transmission through a SLS 10 ULTRA PLUS energy screen?

It has been proven that a movable energy screen makes it possible to reach substantial energy savings. But at Svensson, we know that while saving energy is important, it is not necessarily more important than achieving the maximum possible light transmission into the greenhouse. That is why we developed the SLS 10 ULTRA PLUS.

We take a step further with this new energy screen. Figures such as 88% direct and 81% diffuse light transmission say a lot. What says even more, for example, is the saving of 12 cubic metres of gas per square metre for tomato growers.

Of course, using an energy screen requires a different growing strategy. Or, to put it another way, requires experimentation with light, temperature and humidity levels. Sufficient knowledge about these aspects is now available, certainly at Svensson. There are several different types of the SLS 10 ULTRA PLUS. They vary in terms of openness to achieve the desired humidity level. This is a technical breakthrough with many details that may not be addressed here. If you would like to know more, we or your installer would be happy to provide you with more information.

The most frequently asked questions about SLS 10 ULTRA PLUS.

  1. How many cubic metres of gas can I save annually using the SLS 10 ULTRA PLUS?
    With normal use, you can easily save 12 cubic metres of gas per square metre.
  2. Does the SLS 10 ULTRA PLUS comply with the requirements of the Enhanced Capital Allowance Scheme?
    Yes.
  3. What is the story with the water vapour transmission of this screen?
    SLS 10 ULTRA PLUS is made in a very extraordinary way sothat it is able to breathe. Air humidity remains optimum even when the screen is closed.
  4. Is the SLS 10 ULTRA PLUS flexible enough?
    Yes, thanks to its knitted structure, the screen folds up into a small package, minimising shading as much as possible.
  5. How about light transmission?
    Excellent: the direct light transmission is 88%, the diffuse light transmission is 81%. That is an impressive 6% more than this screen's predecessor, the SLS 10 ULTRA, and no less than 9% more than alternative screens.
  6. How prone is it to becoming dirty?
    Minimum condensation prevents algae growth and the screen remains clean for a long time.
  7. How long does the screen last?
    SLS 10 ULTRA PLUS is resistant to UV, heat and chemicals, so it lasts a very long time - longer than other types of fabric with normal use.
  8. So what are we waiting for?
    Right you are. Contact your installer or us to get to know the most translucent energy screen around: The SLS 10 ULTRA PLUS.

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ROSES

The ideal remedy against high radiation and crop temperatures.


It is quite well known that it is difficult for a rose crop to continue growing and producing quality flowers under high radiation and temperature conditions. Both leaf- and flower temperature might increase dramatically under such conditions, resulting in stress and loss of color in the flowers. Precautions should be taken under such weather conditions to ensure uninterrupted growth and optimum quality. For instance, several growers apply white wash on their roofs for a few weeks or for several months. Others try to increase the humidity and decrease the temperature by means of mist systems or roof sprinklers.

More and more growers have decided to invest in a movable Svensson® screen to improve the climate during the summer season. As Svensson® screens reflect part of the sun radiation back through the plastic or glass of the roof, they lower both ambient and crop temperatures considerably.

The Problem
During hot and sunny weather conditions a rose plant tries to cool itself down by transpiration of water through the leaves. This is, however, a process with a certain maximum capacity. During extreme light and temperature conditions it is not enough to keep the plant temperature under control. As a result, leaf temperatures reach very high levels, resulting in slower growth and sometimes even burning.

A high transpiration rate, taking place at high radiation and temperature levels, is important for the cooling of the crop. When it lasts too long, however, it might result in a stunted growth, as the leaves withdraw water from other parts of the plant like the growing point and the stem. This results into a stocky crop and shorter flower stems with a lower selling price. The flower buds are in an even more delicate position, as they do not have the ability to cool themselves through transpiration. Thus, sun radiation, falling on the buds, is transformed completely into heat, significantly increasing their temperature, easily 5 °C above that of the surrounding air. Flower buds of dark red cultivars like First Red, Grand Prix and Red Berlin are especially sensitive to this. The result is a decline in quality and a loss of color.

The solution
It has been proven that reflective Svensson® screens help solve the above problems to a large extent. Growers in The Netherlands, France, Italy, Israel, and USA and around the globe have experienced great improvements in their crop growth and flower quality by using one of the screens provided by Svensson.

Svensson® screens are made of pure aluminium strips, combined with light transmitting polyester or open strips. The aluminium strips reflect nearly 100% of the sun radiation upwards so that less sun and heat radiation falls on the crop. The result is a considerable decrease in air and crop temperature. At the same time the transpiration rate returns to more normal levels. Energy is spent on growth rather than maintenance.

The overall effect of using the screen is:

  1. A better flower colour
  2. Less leaf burning
  3. Longer flower stems
  4. Quicker development of new flower stems

The effect of Svensson® screens on the inside temperature is clearly illustrated in the following graph. It shows the temperature inside the greenhouse using XLS 14 F FIREBREAK shade screen. This screen reflects 41% of the sun and it has an open structure. This allows the air to pass through the screen, so that the ventilation through roof vents is not hampered.

Closing the screen at around 10:30 a.m. lowers the inside air temperature by up to 5 °C less than with no screen.

No whitewashing anymore
Rose growers who don't use a reflective Svensson® screen often apply whitewash on the roof in order to reduce the incoming radiation. Although being effective in lowering the inside temperature it is considered not to be an optimum solution. The whitewash is permanent, so it also cuts down the incoming light during overcast conditions and during early morning and late afternoon hours. Cutting down the light intensity during such times is not beneficial to the crop. To an extent, it lowers the growth potential of the roses. Those growers who have invested in a movable Svensson® screen could eliminate whitewashing the roof and by this, increase the amount of light available for the crop, by at least 20% over having a permanent of fixed shade level.

Roof sprinklers and mist systems
Screens are not the only means to solve overheating and crop burning. Growers often use a combination of screens, mist systems and/or roof sprinklers. The combined effect not only gives a considerable decrease in the temperature but, simultaneously, an increase in the air humidity.

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XLS FIREBREAK

A breakthrough in limiting greenhouse fires.

XLS FIREBREAK is an improved version of our well-known XLS range of climate screens. The intention of XLS FIREBREAK technology is to limit screen-to-screen fire spread. There is a firebreak section along both edges of each screen. So, the firebreak area is effectively doubled across two adjacent screens. XLS FIREBREAK shall be used in flat, sliding systems partially containing fire-resistant support wires to achieve intended fire limiting performance.

Svensson has developed the firebreak technology for the XLS screens without sacrificing the properties of high efficiency in shading, retaining heat, preventing condensation and transporting excess water vapor. XLS FIREBREAK is available in shading versions from 12-99,9%.

The beauty of XLS FIREBREAK is the materials used, and the manner in which it is constructed, influences the burning. The result is clearly demonstrated, by comparing the amount of heat that is released during burning, of the XLS FIREBREAK and the ALUMINIUM/POLYETHYLENE screen. As a reference we have also plotted the flame retardant screen XLS REVOLUX.

According to Room Scale Test ISO-9705 from SP Swedish National Testing and Research Institute the peak heat release value for XLS FIREBREAK is 43 kW and for ALUMINIUM/POLYETHYLENE screen 1123 kW, i.e. 26 times difference. The heat release of 4 kW for XLS REVOLUX can be neglected.

The total energy released when burning XLS FIREBREAK is 4.0 MJ in comparison to 15.0 MJ for ALUMINIUM/POLYETHYLENE screen and 0.8 MJ for the XLS REVOLUX.

The XLS FIREBREAK installation is different from traditional systems. Before ordering and installing contact your Svensson representative for these details. XLS REVOLUX should be used in all installations where a certificate of flame retardancy screen is required. Perimeter seals used for the XLS FIREBREAK technology has to be XLS REVOLUX screen.

The above information is given in good faith, but without warranty. Freedom from patent rights and registered trademarks must not be assumed. Svensson is a registered trademark owned by AB Ludvig Svensson. The REVOLUX product range is flame retardant, all other products delivered from Svensson are not flame retardant. All textiles, especially when in bundle, will burn at the sufficiently high temperature.


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SVENSSON INSECT SCREEN - LS ECONET

Excluding pests from growing areas is the most effective control method. Some growers have reduced their pesticide use by 90% using LS ECONET in combination with insect-free stock and good sanitation. In addition to being the most effective, it is also the least expensive form of prevention.
Plan your crop production and IPM program in advance. Using good sanitation and exclusion is the key to properly managing your growing environment. Design you ventilation system to handle the pressure loss from insect screens.

Common name

Scientific name

Insect critical dimension,mm*

Western flower thrip

Frankliniella occidentalis

0,215
Silverleaf whitefly Bemisia argentifolii 0,239

Greenhouse whitefly

Trialeurodes vaporariorum

0,288
Melon aphid

Aphis gossypii

0,355
Green peach aphid

Myzus persicae

0,434
Serpentine leafminer Liriomyza trifolii 0,608

* Sources: Bethke 1994

Here are some helpful tips for excluding insects from your greenhouse:

  • LS ECONET generally must have openings as small or smaller than the insects it excludes.
  • Any LS ECONET will reduce the number of insects migrating into crops.
  • LS ECONET must be sized appropriately to avoid hampering ventilation.
  • Use LS ECONET to screen vents and doorways.
  • Keep doors closed, except when entering or leaving the greenhouse.
  • Construct a screened vestibule at greenhouse entrances. Workers and equipment must pass through a plant-free space between two sets of doors before entering the growing area.
  • Create a positive pressure entrance by installing fans so that they blow into the space between the doors causing air to flow from inside to outside.
  • LS ECONET must be cleaned periodically. Use a stream of water to wash from inside to out.

DATA ABOUT SVENSSON® LS ECONET

LS ECONET Air flow reduction, % Light transmission direct, % Hole size 
(mm)          
Standard width
B
5
90
1 X 4
13' 9"
L
25
84
0,6 X 0,6
10' 6"
M
30
90
0,4 X 0,45
10' 10"
SF MAX
25
97
0,3 X 0,75
10' 6"
T
40
85
0,15 X 0,35
11' 2"
S
45
91
0,14 X 0,14
11' 2"


LS ECONET screens carry a warranty against UV degradation: 3 years for outdoor use and 5 years for indoor use. Longevity in most climates is 5 to 8 years.

* Sources:
Bethke, J.A., and T.D. Paine. 1991 Screen hole size and barriers for exclusion of insect pests of glasshouse crops. J. Entomol. Sc. 26: 169-177. Bethke, J.A., R.A. Redak, and T.D. Paine. 1994. Screens deny specific pests entry to greenhouses. Calif. Agric. 48 (3):37-40.
The above information is given in good faith, but without any warranty. Freedom from patent rights and registered trademarks must not be assumed. Svensson is a registered trademark owned by AB Ludvig Svensson. LS ECONET screens are not flame retardant.


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LS GROUNDCOVER

A surface for your greenhouse floor that is stable, stops weeds from growing and reduces heat.

The LS Groundcover is designed to provide you with a stable ground surface for walking on and it will also stop weed growth. It is an invaluable addition to your greenhouse. Made from high quality H.D.P.E., the groundcover is sufficiently porous to prevent puddles from forming.

  • Sheets marked at 20cm intervals for laying out pots
  • Reflects light, reducing harmful heat build up in your greenhouse
  • Assists in ripening the fruits near the ground

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