| 摘要 |
<p>Layup comprises a flexible rectangular traction sheet with a thin layer of friction material on the back, and flexible marker tubes of partially cured cross-linked polymer tubing hardened into the constrained flattened shape fixed transversely across te sheet fron face by releasably pressure adhesive. The tubes are pref. of polyvinylidene fluoride or modified polyolefin, and the friction layer is a polymer film to maximise traction with a typewriter platen of similar material. The adhesive is pref on a tape overlying and removably adhered to one tube and underlying the next where it is permanently attached to the sheet.</p> |
