The ornamental design for a plastichook for paperhanger, as shown and described.
FIG. 1 is a front perspective view of a plastic hook for paper hanger showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is an enlarged front elevation view thereof;
FIG. 4 is an enlarged rear elevation view thereof;
FIG. 5 is an enlarged right side elevation view thereof;
FIG. 6 is an enlarged left side elevation view thereof;
FIG. 7 is an enlarged top view thereof; and,
FIG. 8 is an enlarged bottom view thereof.
The broken lines shown represent portions of the plastic hook for paper hanger and environmental subject matter that form no part of the claimed design.