Composite pane having a multiple-ply composite layer and method for production thereof

A composite pane, comprising:

• an inner pane;
• an outer pane;
• and
• at least one multiple-ply composite layer arranged between the outer pane and the inner pane, wherein the at least one multiple-ply composite layer is a laminate, including
• a first thermoplastic film adhered to an inner face of the outer pane,
• at least one polyester film adhered to a surface of the first thermoplastic film opposite the inner face of the outer pane, and
• a second thermoplastic film positioned between the at least one polyester film and a top surface of the inner pane that is opposite the inner face of the outer pane,
• wherein a ratio, a/b, of a thickness a of the first thermoplastic film to a thickness b of the at least one polyester film, is in a range from 1/5 to 5/1,
• wherein a ratio, c/(a+b), of a thickness c of the second thermoplastic film to a sum of the thickness a and the thickness b, is in a range from 25/1 to 2/1,
• wherein the first thermoplastic film and the at least one polyester film have a common edge that runs at a distance A parallel to an edge of the second thermoplastic film, and
• wherein a material of the second thermoplastic film fills a space between the common edge, the inner face of the outer pane, and the edge of the second thermoplastic film, and is fused with a material of the first thermoplastic film so that the common edge is isolated from an environment of the composite pane.

A method for producing a composite pane, the method comprising:

• providing an inner pane having a top surface;
• covering the top surface with a second thermoplastic film up to a region that defines an edge of the second thermoplastic film;
• completely covering a surface of the second thermoplastic film opposite the top surface with at least one polyester film;
• completely covering a free surface of the at least one polyester film with a first thermoplastic film;
• using a cutting device, vertically cutting the first thermoplastic film and the at least one polyester film at a distance A from the edge;
• based on the cutting, removing a strip of the first thermoplastic film and the at least one polyester film having a width A, thereby forming a common edge of the first thermoplastic film and the at least one polyester film, and exposing a free horizontal surface of width A of the second thermoplastic film;
• and
• arranging an inner face of an outer pane to make contact with a top surface of the first thermoplastic film, and pressing the outer pane with a pressure D, thereby filling a free space between the edge of the second thermoplastic film, the inner face of the outer pane, and the top surface of the inner pane by inflow of a material of the second thermoplastic film, and forming the composite pane.