Chalk eraser made from closed cell foam plastic

Abstract

Abstract An improved eraser having excellent wiping and wear qualities is composed entirely or principally of a cellular thermoplastic foam, preferably of expanded, closed-cell polyethylene foam, with the erasing surface being abraded or otherwise treated to form open and feathered cells at the surface. The eraser is of a one piece solid construction with an integrally formed handle which protects the fingernails of the user. The sides of the eraser are beveled to minimize flipping during use. The eraser is formed by passage of the expanded plastic foam stock material through a heated wire form, which cuts the material to the desired form and also provides a fused, impervious skin of plastic material over the eraser body. The erasing surface is then cut, roughened, abraded, or otherwise similarly treated to impart the desired wiping and erasing qualities thereto.

Inventors

• 👤 Frank E Vopat
• 👤 Stephen L Colucci

Bibliographic Details