发明名称 |
Vorrichtung zur langsamen Freigabe eines Pestizids |
摘要 |
A spun-bonded, preferably paper-like, polyolefin sheet (1) or fleece composed of heat and pressure bonded minute polyolefin fibres which is vapour- and gas-pervious but impervious to liquid water and dust, naturally water-resistant and of high tensile and tear strength, is rendered heat-weldable. The material is used for making an applicator for releasing volatile substances, e.g. phosphine derived from metal phosphides at a controlled rate and with complete protection of the contents against liquid water. Excessive local phosphine build-up is avoided. The release rate is controlled by the sheet material itself and by its available surface area. A heat weldable sheet material (1), in particular for the above purposes, is coated, preferably by powder sprinkle coating with a thermoplastic highly porous heat welding bonding layer (2), e.g. EVA, melting so much lower (say 30 to 80 DEG C lower) than the polyolefin fibres that a heat welding seam (6) forms before the fibres melt so that the physical properties of the polyolefin fibres and the gas permeability are substantially retained. |
申请公布号 |
DE3855728(T2) |
申请公布日期 |
1997.04.17 |
申请号 |
DE19883855728 |
申请日期 |
1988.05.25 |
申请人 |
DETIA FREYBERG GMBH, 69514 LAUDENBACH, DE |
发明人 |
FRIEMEL, WOLFGANG, DR., W-6148 HEPPENHEIM, DE;BARTH, VOLKER ERWIN, DR., W-6700 LUDWIGSHAFEN, DE |
分类号 |
B32B3/26;A01M17/00;A01N25/18;A01N25/34;A01N59/26;B32B5/24;B32B7/02;B32B27/12;B65D65/38;B65D65/42;B65D81/28;B65D85/82;(IPC1-7):B65D65/38;A01M1/20 |
主分类号 |
B32B3/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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