Polymer workpiece for flow coating

A polymer workpiece configured to reduce flow coating problems at an upper main surface of the polymer workpiece, the polymer workpiece comprising:

• an upper main surface,
• a lower main surface,
• an injection-mold separating surface including a surface region being an external surface between the upper main surface and the lower main surface, and
• a flow attack edge surface comprising an upper attack surface, a lower attack surface, and the surface region of the injection-mold separating surface that joins the upper attack surface to the lower attack surface,
• wherein the surface region of the injection-mold separating surface is a region of the flow attack edge surface facing the lower main surface running with a length from 0.005 mm to 0.1 mm along the injection-mold separating surface,
• wherein the upper attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the upper main surface that is formed as a convexly curved surface having an upper attack surface radius of curvature, and
• wherein the upper attack surface radius of curvature and the length from 0.005 mm to 0.1 mm are configured to guide a flow coating solution flooded onto the flow attack edge predominantly to the lower main surface to reduce flow coating problems at the upper main surface.

A method for producing a coated polymer workpiece, comprising:

• providing a polymer workpiece comprising an upper main surface, a lower main surface, an injection-mold separating surface between the upper main surface and the lower main surface that is an internal surface, and a flow attack edge surface comprising an upper attack surface and a lower attack surface,
• wherein the upper attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the upper main surface, and is formed as a convexly curved surface having an upper attack surface radius of curvature,
• wherein the lower attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the lower main surface, and is formed as a planar or convexly curved surface that deviates by an amount a from 0.0 mm to 0.5 mm from a planar surface that has an angle α relative to the injection-mold separating surface from 20° to 70°, and
• wherein the planar surface passes through i) a junction point of the upper attack surface and the injection-mold separating surface, and ii) a junction point of the lower main surface and the lower attack surface, and
• wherein the flow attack edge surface is an external surface between the upper main surface and the lower main surface,
• arranging the polymer workpiece with the flow attack edge surface pointing upward at an angle α relative to horizontal from 25° to 85°, wherein the lower main surface is facing ground,
• flooding the polymer workpiece from the flow attack edge surface onward with a coating solution, and
• based on the flooding, the upper attack surface radius of curvature, the amount a, and the angle α, guiding the coating solution predominantly to the lower main surface and thereby reducing flow coating problems at the upper main surface.

A method comprising:

• using a polymer workpiece as a pane, as a component of a pane, as a plastic covering of means of transportation for travel on land, in the air, or on water used, in particular as a rear window, windshield, side window, roof window, headlight cover, trim strip, and/or as a motor vehicle roof of passenger vehicles, trucks, buses, streetcars, subways, trains, and motorcycles,
• wherein the polymer workpiece comprises an upper main surface, a lower main surface, an injection-mold separating surface between the upper main surface and the lower main surface that is an internal surface, and a flow attack edge surface comprising an upper attack surface and a lower attack surface,
• wherein the upper attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the upper main surface, and is formed as a convexly curved surface having an upper attack surface radius of curvature,
• wherein the lower attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the lower main surface, and is formed as a planar or convexly curved surface that deviates by an amount a from 0.0 mm to 0.5 mm from a planar surface that has an angle α relative to the injection-mold separating surface from 20° to 70°,
• wherein the planar surface passes through i) a junction point of the upper attack surface and the injection-mold separating surface, and ii) a junction point of the lower main surface and the lower attack surface, and
• wherein the flow attack edge surface is an external surface between the upper main surface and the lower main surface and
• wherein the upper attack surface radius of curvature, the amount a and the angle α are configured to guide a flow coating solution flooded onto the flow attack edge predominantly to the lower main surface to reduce flow coating problems at the upper main surface.

A method for producing a coated polymer workpiece, comprising:

• providing a polymer workpiece comprising an upper main surface, a lower main surface, an injection-mold separating surface including a surface region being an external surface between the upper main surface and the lower main surface, and a flow attack edge surface comprising an upper attack surface, a lower attack surface, and the surface region of the injection-mold separating surface that joins the upper attack surface to the lower attack surface,
• wherein the surface region of the injection-mold separating surface is a region of the flow attack edge surface facing the lower main surface runs with a length from 0.005 mm to 0.1 mm along the injection-mold separating surface,
• wherein the upper attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the upper main surface that is formed as a convexly curved surface having an upper attack surface radius of curvature, and
• wherein the flow attack edge surface is an external surface between the upper main surface and the lower main surface,
• arranging the polymer workpiece with the flow attack edge surface pointing upward at an angle α relative to horizontal from 25° to 85°, wherein the lower main surface is facing ground,
• flooding the polymer workpiece from the flow attack edge surface onward with a coating solution, and
• based on the flooding, the upper attack surface radius of curvature, the length from 0.005 mm to 0.1 mm, and the angle α, guiding the coating solution predominantly to the lower main surface and thereby reducing flow coating problems at the upper main surface.

A method comprising:

• using a polymer workpiece as a pane, as a component of a pane, as a plastic covering of means of transportation for travel on land, in the air, or on water used, in particular as a rear window, windshield, side window, roof window, headlight cover, trim strip, and/or as a motor vehicle roof of passenger vehicles, trucks, buses, streetcars, subways, trains, and motorcycles,
• wherein the polymer workpiece comprises an upper main surface, a lower main surface, an injection-mold separating surface including a surface region being an external surface between the upper main surface and the lower main surface, and a flow attack edge surface comprising an upper attack surface, a lower attack surface, and the surface region of the injection-mold separating surface that joins the upper attack surface to the lower attack surface,
• wherein the surface region of the injection-mold separating surface is a region of the flow attack edge surface facing the lower main surface that runs with a length from 0.005 mm to 0.1 mm along the injection-mold separating surface,
• wherein the upper attack surface is an entire region of the flow attack edge surface between the injection-mold separating surface and the upper main surface that is formed as a convexly curved surface having an upper attack surface radius of curvature,
• wherein the flow attack edge surface is an external surface between the upper main surface and the lower main surface, and
• wherein the upper attack surface radius of curvature and the length from 0.005 mm to 0.1 mm are configured to guide a flow coating solution flooded onto the flow attack edge predominantly to the lower main surface to reduce flow coating problems at the upper main surface.