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Stamp and die cutting tool for paper web - has cylindrical die whose opening widens tttowards free end of hollow die

Waibel Martin
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TLDR
In this article, a cylindrical body with a floor is formed whose shape matches that of the associated stamping tool, and the opening widens in its cross-section towards the free end of the hollow body.
Abstract: 
A cutting tool is esp. for stamping holes in a paper web which passes between two drums and has a stamping tool positioned releasably in one drum and a die in the other. The die comprises a cylindrical body (6) with a floor (7) in which an opening (8) is formed whose shape matches that of the associated stamping tool. The opening widens in its cross-section towards the free end of the hollow body. At its inlet end the die has a cylindrical section (9) whose axial length is less than that of the broadened section (10) of the opening. The use of such a broadened section ensures that the die has a longer service life.

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Patent

Method and apparatus for perforating a non-woven sheet

Boscolo Galliano
TL;DR: In this paper, a perforation in a non-woven sheet (N) is obtained by cutting out a portion (P) of the nonwoven sheets by shearing of the fibers or filaments of the N, between the sharp edge ( 8 g ) of the insert ( 8 ) and a perfating member ( 9 ) driven simultaneously in translation and in rotation about its own axis.
Patent

Method and apparatus for perforationg non-woven webs

Boscolo Galliano
TL;DR: In this article, the sheet material is passed between a perforated cylinder and a roller with spring-loaded perforating fingers, where the perforations are formed by a series of detachable inserts with sharp edges.
Patent

Non-woven sheet material perforating procedure and machine uses cylinder with sharp-edged hollow inserts and roller with perforating fingers

Boscolo Gianni G
TL;DR: In this article, the sheet material is passed between a perforated cylinder and a roller with spring-loaded perforating fingers, where the perforations are formed by a series of detachable inserts with sharp edges.