Fourdrinier windowed thread.,申请号ZA19920007952-传众专利搜索

Fourdrinier windowed thread.

申请公布号：ZA9207952(B)

申请号：ZA19920007952

申请日期：1992.10.15

申请公布日期：1993.04.26

申请人：

PORTALS LIMITED

发明人：MALCOLM ROBERT MURRAY KNIGHT

分类号：D21F1/44;D21H21/42

主分类号：D21F1/44

摘要：This invention relates to a method of making sheet materials and security paper having partially embedded therein an elongate security element which is at least substantially exposed at one surface of the sheet at a plurality of spaced locations, which method comprises the steps of depositing fibres onto a moving support surface, supplying an elongate security element to overlie rotatable embedment means, which embedment means comprise a plurality of spaced-apart raised portions having recesses therebetween, introducing the security element into the fibres with rotation of the embedment means such that some fibres move into said recesses between the security element and the embedment means so that said security element is covered by fibres, and substantially preventing fibres from penetrating between the raised portions and the overlying security element.