Posted by
JinjiudingFRP on Thursday, November 12, 2009 2:31:09 AM
The international community often referred to as glass fiber
reinforced plastic polyester-based plates, written in English FRP (Fiber
Glass-Reinforced Plastics) glass plate refers to the unsaturated polyester resin
impregnated glass fiber mat, glass fiber fabrics or chopped fibers, and
condensate rubber curing and obtained the products, it has a light weight, high
strength, impact performance, particularly those with a unique translucent
nature of construction of building structures for lighting and lighting of
greenhouse crops marked effect, as well as excellent corrosion resistance,
resistance to atmospheric aging, simplify the design, installation, replace them
simple and can choose the color.
A glass plate with the raw materials
A
reinforcing material
FRP panels are usually reinforced material of choice
for the glass cloth, untwisted glass rovings, chopped glass fiber mat.
Twist
Glass Roving
Continuous FRP corrugated molding process of glass used in
untwisted rovings should have a good cutting, decentralized nature, branch
invasive, does not produce static electricity or less.
Short-cut glass fiber
mat is usually used in the current domestic chopped glass fiber mat of the
specifications, EMC300, EMC450, EMC600 three, with a density of uniform, soaked
in good, clean, weather, light transmission and so on.
2 resin matrix
Continuous FRP corrugated sheet forming process the majority of selected
unsaturated polyester resins (UP) resin, has high mechanical strength, good
weatherability and impact resistance, but also has a lower shrinkage rate and
the appropriate viscosity in order to impregnated glass fiber has a good nature
of Pai Pao.
3 Films
FRP corrugated sheet forming a continuous film with
the requirements, the surface smooth, without folds outside the most important
thing is have a high tensile strength and a certain degree of heat resistance,
to ensure that the process of forming corrugated film is not deformed, according
to use of FRP corrugated film film and anti-aging process can be divided into
two kinds of films.
a single fluoride films, anti-aging effects of
atmospheric and light excellent, can be used for corrugated board up to 20
years.
b polyester film.
4 Other supporting material
FRP plates used
in the resin formulations of the supporting materials, initiator, accelerator,
pigment lakes, UV absorbers, and now the widespread use of methyl ethyl ketone
peroxide, cobalt accelerator solution for different bitterness, so that
corrugated pure color, in particular, is to make transparent board for more than
87% light transmission rate.
High-quality light board has the following features:
1,
transmission - up to 85% light transmission for more than 90% of the sun
blocking ultraviolet radiation.
2, weather resistance - in Celsius -40 ?
~ 120 ? temperature range to maintain stable performance, does not appear high
temperature softening, the phenomenon of cold embrittlement.
3,
flame-retardant - flame retardant lighting board oxygen index ≤ 30%, up to the
national standard of two flame-retardant.
4, portability - light weight,
superior impact resistance, not easy to break, beautiful and practical, easy to
install.
5, anti-aging properties - products are available for 15 years, the
same yellow, do not fade.
Lighting panels in a greenhouse on the Application of
Transparent glass steel Greenhouse:
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A transparent glass fiber reinforced
plastic greenhouse in a transparent glass fiber reinforced plastic instead of
glass, built a greenhouse. Practice has proved that in a transparent glass fiber
reinforced plastic greenhouse cultivated plants and crops, can significantly
improve the yield and quality to achieve results. For example, Wuhan University
and Beijing Chinese holly leaf jointly built by the transparent glass fiber
reinforced plastic greenhouse, using even the inter-frame structure, simple
structure, easy construction and low cost. Greenhouse cucumber, tomato
significantly increase production, the data show that glass fiber reinforced
plastic greenhouse in winter cucumber yield under the same conditions than in
glass fiber reinforced plastic greenhouse, high yield 55%, in the spring tomato
yield 48%. In Europe, transparent glass fiber reinforced plastic greenhouse
cultivation of vegetables and flowers than the annual output of greenhouse
glass, steel 10% ~ 20%. Beijing FRP apple orchard louang nursery greenhouse was
imported from America, and in nurturing seedlings, planting flowers, planting of
rare trees and tropical plants has made great achievements.
Transparent
glass fiber reinforced plastic greenhouse structure:
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Transparent glass and steel is light and the
carrying capacity of multi-functional composite materials used to build
greenhouses can simplify the design of building structures, save material,
reduce costs and facilitate construction.
Many forms of glass
fiber reinforced plastic greenhouse, small greenhouse often used single-slope
roof structure. The light side of this greenhouse is transparent glass fiber
reinforced plastic plates, in order to reduce the support structure, the use of
transparent glass, the strength of steel, light panels can be designed to build
cross-section for waveform, curved, folded plate-shaped and trapezoidal and so
on.
Large glass-steel greenhouse can be used with cross-vaulted
roof, or double-sloping roof, this greenhouse can be used load-bearing structure
of aluminum, galvanized light steel and prestressed reinforced concrete
structures. Greenhouse-span is generally 6 ~ 12m, can also be designed to be
larger, such as Germany built for the 18m span steel glass greenhouse, sloping
transparent glass roof is a two-wave cross-section three twisted steel arch
plate, a transparent glass side walls folded steel plate, arch seat and columns
of steel.
In a greenhouse scale, done specifically statistics,
greenhouse area to 300 ~ 400m2, 900 ~ 1000m2, and 1000 ~ 1500m2 up. Small area
of greenhouse used for kinds of melon, nursery, 1000 m2 large area is mainly
used for greenhouse cucumbers, tomatoes, eggplant and other vegetables growing.
To save energy, farmers in northern China more than a single-slope greenhouse
plus insulation cover.
A variety of sunlight on plant photosynthesis:
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In vegetables, flowers and crops, the growth
process, the role of its light is only a part of the sun - visible light. Too
much solar radiation the Earth's surface on the UV wavelength is 290 ~ 400um,
visible light is 400 ~ 760um, infrared light and far-infrared light for more
than 760um.
? It is an invisible ultraviolet short-wave light, the
wavelength range of 290 ~ 390um, on plant growth would not achieve a positive
role, but the metabolism of plant growth, as well as changes in flower color is
essential. Therefore, planting eggplant, cherry, flowers, greenhouse, hoping
ultraviolet light through a little bit more. For the Department of root and leaf
vegetables, flowers, remove the UV light contribute to the growth of plants.
Impervious to UV light in the greenhouse cultivation of vegetables, Komatsu
dish, round pepper, their photosynthesis faster than in the open air cultivation
large and Sclerotinia sclerotiorum on cucumber, tomatoes inhibit the toxic
diseases.
? wavelength of visible light visible light range 400 ~
760um, removing 500um below the wavelength, can improve the quality of tea. In a
translucent membrane, under selective cultivation of soybeans, crude protein
content increased; in the blue film under cultivation, increased water content;
in pink under the crude fat content of films increased, while root systems are
well developed. In the plant growth process, the visible light is very
important, in which red-orange light on crops play a key role in photosynthesis,
crops also depend on the formation of vegetative organs of blue, purple. Visible
light transmittance and thus directly affect the production of vegetables and
flowers, and quality.
? infrared wavelength 760um or more infrared
light alone, 760 ~ 800um wavelength of light is necessary for bud formation and
flowering of light. 800um above the light is not absorbed by crops, only
reflected or transmitted.
In the radiant energy of sunlight, 740um
or more near-infrared light accounted for 50% to 60%.
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