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发明申请
US20090092445A1 Apparatus for making drainage element with a periphery of different materials 有权
用于制造具有不同材料周边的排水元件的装置

Apparatus for making drainage element with a periphery of different materials
摘要：
The drainage element is made with a periphery formed of a filter material that allows the passage of water and prevents the passage of soil and a second peripheral section of net material that allows the passage of water while the preventing the passage of the lightweight aggregate therein. The filter material is preferably made of spun bonded polyester and may be made of a biodegradable material such as starch.
摘要（中）：

排水元件由具有允许水通过并防止污物通过的过滤材料制成的周边和允许水通过的网状材料的第二周边部分，同时防止轻质骨料在其中通过。 过滤材料优选由纺粘聚酯制成，并且可以由可生物降解的材料如淀粉制成。

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