B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 59/04 (2006.01) A61F 13/15 (2006.01) B26F 1/10 (2006.01) B26F 1/20 (2006.01) B26F 1/26 (2006.01) B29C 51/10 (2006.01)
Patent
CA 2225719
The invention is directed to a cylindrical screen (14) for perforating a thermoplastic film (17) or sheets. The screen (14) is formed from a relatively thin sheet (31) that is secured together to form a cylindrical shape. A plurality of apertures (41) are positioned in the sheet (31) and the apertures (41) in the sheets (31) form a passageway (45) through the screen (14). The passageways are disposed at an angle from about 5~ to about 60~ with respect to a plane (47) that is disposed substantially perpendicular to the surface (39) of the screen (14).
L'invention porte sur un crible cylindrique (14) permettant de perforer un film thermoplastique (17) ou des feuilles thermoplastiques. Ce crible (14) est constitué d'une feuille relativement mince (31) assujettie sur elle-même pour donner une forme cylindrique. Plusieurs ouvertures (41) se trouvent dans la feuille (31) et y constituent un passage (45) traversant le crible (14). Ces passages se répartissent selon un angle compris entre environ 5 et environ 60· par rapport à un plan (47) sensiblement perpendiculaire à la surface (39) du crible (14).
G. Ronald Bell & Associates
Tredegar Film Products Corporation
Tredegar Industries Inc.
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