A laminated, cylindrical, metal screen or molding element for vacuum perforation of plastic film or sheets, comprising two or more relatively thin cylindrical metal screens, each having a predetermined inside and outside diameter and each having a plurality of openings or holes therein of a predetermined size and geometrical shape, and said relatively thin screens stacked and bonded together, diametrically one inside the other thereby providing a screen of a desired thickness and a desired hole geometry wherein the holes in the screen have substantially straight walls perpendicular to the surface of the screen. A method of producing a relatively thick cylindrical metal screen for vacuum perforation of plastic film or sheets wherein the holes or openings in the screen have substantially straight walls perpendicular to the surface of the screen, comprising stacking and bonding together two or more matched relatively thin metal screens diametrically one inside the other.
An engine mount includes an inner member and an outer cylinder having a circumferential position around a central axis of the engine mount, the circumferential position being changeable relative to the inner member. A bracket fixed to the inner member supports an engine on the engine mount, the bracket having a circumferential position around the central axis of the engine mount which is changeable relative to the outer cylinder. A stopper of an elastic material is provided on one of the outer cylinder and the inner member, the stopper contacting the other of the outer cylinder and the inner member when a change in length of one of the outer cylinder and the inner member relative to the other exceeds a reference level. An interconnecting member of an elastic material exerts a pressing force on the outer cylinder and the inner member such that the other of the outer cylinder and the inner member is contacted by the stopper to prevent the change in length of one of the outer cylinder and the inner member from further increasing from the reference level. A reference position indicating unit indicates whether the circumferential positions of the outer cylinder and the bracket relative to each other around the central axis of the engine mount are reference positions.
5897543 - Film - Owned by Tredegar Industries, Inc. (Richmond, VA)
The invention is directed to a thermoplastic film having a first surface and a second surface. The second surface is spaced apart from the first surface. A plurality of perforations extend through the film from the first surface to the second surface. The perforations form capillaries that extend from the second surface. The capillaries are disposed at an angle from about 5.degree. to about 60.degree. with respect to a plane that is perpendicular to the first surface.
A cylindrical screen for perforating a thermoplastic film or sheets has an outer surface and an inner surface. A plurality of outer apertures extend from the outer surface and terminate at a corresponding inner aperture on the inner surface of the screen. The apertures in the outer surface can have the same or a different geometrical shape as the apertures in the inner surface. The apertures form a passageway through the screen. The passageways are disposed at least one angle from about 5.degree. to about 60.degree. with respect to a plane that is disposed substantially perpendicular to the outer surface of the screen to prevent a direct line of sight through the screen.
The invention is directed to a layered fabric material that is breathable and has resistance to fluid penetration. The fabric has a lightweight, breathable outer layer and a layer of non-woven material. The non-woven material is breathable and fluid resistant. The fabric also includes a thermoplastic film having a plurality of perforations. The perforations form capillaries that extend from a surface of said film. The capillaries are disposed at an angle from about 5.degree. to about 60.degree. with respect to the surface of said film. The capillaries formed by the perforations allow the film layer to be breathable while resisting direct flow of liquid through the film.
A cylindrical screen for perforating a thermoplastic film or sheets. The screen is formed from a relatively thin sheet that is secured together to form a cylindrical shape. A plurality of apertures are positioned in the sheet and the apertures in the sheets forms a passageway through the screen. The passageways are disposed at an angle from about 5.degree. to about 60.degree. with respect to a plane that is disposed substantially perpendicular to the surface of the screen.
