| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an inexpensive covering material which is widely useful regardless of the kind of a medium, simply applied and transported, has a medium temperature being hardly affected by an outside air temperature, is readily adjusted to a proper temperature and in which a drain is reused without being discharged in a field and to provide a method therefor. <P>SOLUTION: The medium cover film is obtained by attaching a water-permeable material such as a nonwoven fabric, a net or a polyolefin-based resin film having effective pores to the proper position of the inside of a polyolefin-based resin film which is twice-folded, has proper thickness and is mixed with a suitable amount of a weather-resistant agent and making a drainage layer and a cultivation layer from the same film. At least the cultivation layer of the medium cover film has constitution of two or more layers of the piled films and the medium cover film has temperature regulation function by passing a fluid having a proper temperature through the intermediate zone of the films. <P>COPYRIGHT: (C)2004,JPO |
