MULCHING SHEETS MANUFACTURING METHOD, SHEETS FOR ENVIRONMENT FRIENDLY FARMING AND MANUFACTURING METHOD THEREOF

WIPO Patent Application WO/2010/095806

A2

The manufacturing method of mulching sheets of the present invention comprises: introducing a 1st mixture into a 1st extruder, the 1st mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form, a foaming agent and calcium carbonate; introducing a 2nd mixture into a 2nd extruder, the 2nd mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form with calcium carbonate; introducing a 2nd mixture into a 3rd extruder, the 2nd mixture prepared by mixing a raw material composed of polyethylene or polypropylene materials in powder or pellet form with calcium carbonate; performing a simultaneous blow molding of the 1st mixture discharged from the 1st extruder, the 2nd mixture discharged from the 2nd extruder and the 2nd mixture discharged from the 3rd extruder via a single outlet such that the 1st mixture components are disposed on the outer surface of a mold, and the 2nd mixtures discharged, respectively, from the 2nd and 3rd third extruders are disposed on the middle and inner surfaces in that order; and cutting the blow mold into vertical sections to put the cut blow molds around a tube, making each mold spread out in a sheet form.

LEE SANG HAN (KR)
KIM YOUNG SIK (KR)
LEE YOUNG KUK (KR)

PCT/KR2009/007402

August 26, 2010

December 10, 2009

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LEE SANG HAN (KR)
KIM YOUNG SIK (KR)
LEE YOUNG KUK (KR)

B29C47/04; B29D7/01; C08J5/18

KR100520128B1	2005-10-11
KR20070016686A	2007-02-08
KR100794584B1	2008-01-17
KR100359493B1
US20050170118A1	2005-08-04

GO, SEUNG HO (KR)
고승호 (KR)

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