温室大棚覆盖材料的种类与性能
温室大棚覆盖材料有以下几种：
1．普通膜。以聚乙烯或聚氯乙烯为原料，膜厚0.1毫米，无色透明。使用寿命约为半年。
2．多功能长寿膜。是在聚乙烯吹塑过程中加入适量的防老化母料和表面活性剂制成。目前生产的宽幅（7.5米）多功能膜，厚0.06毫米，使用寿命比普通膜长一倍，夜间棚温可高1～2℃，而且膜面不易结水滴。因而覆盖效果好，成本低，效益高。
3．草被、草扇。草被、草扇是常用的夜间保温材料，用稻草编织而成，保温性较好。
4．聚乙烯高发泡软片。白色多气泡的塑料软片，宽1米，厚0.4～0.5厘米，质轻能卷起。保温性与草被相近。
5．无纺布。为一种涤纶长丝、不经纺织的布状物。分黑白两种，并有不同的密度和厚度。常用规格为50克/米2。除保温外，还常用作遮阳防雨。
6．遮阳网。一种塑料编织丝网，目前常用有黑色和银灰色两种，并有数种密度规格，遮光率各有不同。主要用于遮阳防雨，但也可作冬天保温覆盖用。
The types of greenhouses cover material and performance
Canopy cover material has the following kinds:
1. The common membrane. With polyethylene or polyvinyl chloride as raw materials, film thickness 0.1 mm, colorless transparent. Life is about half a year.
2. The multifunctional longevity membrane. Is in the process of polyethylene blow molding to join the right amount of anti aging masterbatch and surfactant. Currently xinguang plastics factory production in zhejiang province wide (7.5 meters) multifunctional film, 0.06 mm thick, twice as long service life than ordinary membrane, shed WenKeGao 1 ~ 2 ℃ at night, and the membrane surface and water droplets. Thus covering effect is good, low cost and high efficiency.
3. The grass, grass fan. Grass, grass is the commonly used thermal insulation material at night, woven with straw, heat preservation is good.
4. High polyethylene foam film. White bubble plastic film, 1 meter wide, 0.4 ~ 0.5 cm thick, can light up. Heat preservation are similar with grass.
5. Non-woven fabric. As a kind of polyester filament, without textile cloth. Divide into two kinds, black and white and have different density and thickness. Commonly used specifications 50 g/m2. In addition to the heat preservation, also commonly used as sunshade rainproof.
6. Sun-shade net. A plastic woven wire mesh, now commonly used in both black and silver, and the density of several kinds of specifications, the shading rate is different. It is mainly used for sunshade rainproof, but also to make a winter insulation cover. |
