초록 ▼

The fibrous structure of a non-woven mat is disrupted by an apparatus comprising at least one roll which has one or more upraised ribs in a chevron pattern extending helically around the roll. In processing, the mat passes under tension over at least a portion of at least one chevron roll and prefer

The fibrous structure of a non-woven mat is disrupted by an apparatus comprising at least one roll which has one or more upraised ribs in a chevron pattern extending helically around the roll. In processing, the mat passes under tension over at least a portion of at least one chevron roll and preferably over two chevron rolls which may or may not be intermeshing. Thereafter, the mat may be crushed or crimped by being fed through to intermeshing third and fourth chevron rolls. Additional rolls may be supplied to exert tension. The mat which exits from the apparatus has a disrupted fibrous structure and is a superior skeleton within a structure such as a polymeric foam board.

대표청구항 ▼

A method of disrupting the fiber structure and at least doubling the thickness of a non-woven fibrous mat comprising passing said non-woven fibrous mat under tension over a first rotating roll having extending radially outwardly therefrom and helically therearound at least one rib formed in a chevro

A method of disrupting the fiber structure and at least doubling the thickness of a non-woven fibrous mat comprising passing said non-woven fibrous mat under tension over a first rotating roll having extending radially outwardly therefrom and helically therearound at least one rib formed in a chevron pattern, wherein the portions of the rib extending away from the point of the chevron are curved continuously over substantially the entire width of the mat, and passing said mat over a second rotating roll having extending radially outward therefrom and helically therearound at least one rib formed in a chevron pattern disposed on said second roll, wherein the portions of the rib extending away from the point of the chevron are curved continuously over substantially the entire width of the mat, and wherein both of said first and second rolls are disposed with the portion of the chevron pattern defining an angle less than 180°toward the mat portion coming into contact with said first or second roll.