The ornamental design for a coretray, as shown and described.
FIG. 1 is a front perspective view of the core tray showing the new design;
FIG. 2 is a top perspective view thereof;
FIG. 3 is a bottom perspective view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a front end view thereof;
FIG. 8 is a sectional end view seen along arrows VIII-VIII in FIG. 4;
FIG. 9 is a sectional end view seen along arrows IX-IX in FIG. 4; and,
FIG. 10 is a enlarged view of the area indicated by arrow X in FIG. 9.
It is noted that the left side of the core tray is a mirror image of the right side shown in FIG. 6, and the back end of the core tray is a mirror image of the front end shown in FIG. 7.
The broken line showing in FIGS. 4, 9, and 10 is included for the purpose of illustrating the plane of the sectional views and enlarged areas and forms no part of the claimed design.