MOLDED POLYMERIC ARTICLE
A molded polymeric article includes a polymeric wall that has first and second legs that join each other at an inside corner. The first and second legs include respective continuous surfaces that meet at the inside corner and transition at respective inflections into a corner notch. The corner notch includes side surfaces extending from the inflections to a bottom surface that joins the side surfaces. The corner notch facilitates the mitigation of thermal warpage of the polymeric wall.
1 . A molded polymeric article comprising:
a polymeric wall including first and second legs that join each other at an inside corner, the first and second legs including respective continuous surfaces that meet at the inside corner and transition at respective inflections into a corner notch, the corner notch including side surfaces extending from the respective inflections to a bottom surface that joins the side surfaces.
2 . The article as recited in claim 1 , wherein the corner notch has a notch depth, and the notch depth is 25% to 50% of the thickness of the polymeric wall.
3 . The article as recited in claim 1 , wherein the corner notch has a notch depth, and the notch depth is approximately 50% of the thickness of the polymeric wall.
4 . The article as recited in claim 1 , wherein the corner notch is non-rectilinear.
5 . The article as recited in claim 1 , wherein the corner notch is rectilinear.
6 . The article as recited in claim 1 , wherein the corner notch is located along the inside corner with respect to a maximum radius of curvature of the inside corner.
7 . The article as recited in claim 1 , wherein the corner notch is located along the inside corner at a maximum radius of curvature of the inside corner.
8 . The article as recited in claim 1 , wherein the continuous surfaces define an angle there between of 120° or less.
9 . The article as recited in claim 1 , wherein the polymeric wall has a nominal thickness of 2-4 millimeters, and the corner notch has a notch depth, and the notch depth is approximately 50% of the nominal thickness of the polymeric wall.
10 . The article as recited in claim 1 , wherein the first and second legs also join at an outside corner opposite the inside corner, the outside corner being smooth and notch-free.
11 . The article as recited in claim 1 , wherein the first and second legs also join at an outside corner opposite the inside corner, wherein the corner notch provides a surface area in the inside corner that is approximately equal to a surface area of the outside corner.
12 . A method of fabricating a molded polymeric article, the method comprising:
molding a polymeric wall having first and second legs that join each other at an inside corner, the first and second legs being molded to include respective continuous surfaces that meet at the inside corner and transition at respective inflections into a corner notch, the corner notch including side surfaces extending from the inflections to a bottom surface that joins the side surfaces.
13 . A molded polymeric article comprising:
a polymeric wall including first and second legs that join each other at an inside corner, the inside corner including a corner notch that is located along the inside corner with respect to a maximum radius of curvature of the inside corner.
14 . The article as recited in claim 13 , wherein the corner notch is located along the inside corner at the maximum radius of curvature of the inside corner.
15 . The article as recited in claim 14 , wherein the polymeric wall has a nominal thickness of 2-4 millimeters, and the corner notch has a notch depth, the notch depth being approximately 25% to 50% of the nominal thickness of the polymeric wall, and the first and second legs also join at an outside corner opposite the inside corner, wherein the corner notch provides a surface area in the inside corner that is approximately equal to a surface area of the outside corner, the notch depth, location of the corner notch along the inside corner and the surface area mitigating thermal warpage of the polymeric wall.