Method of welding plastic seams
AssigneeNeumann Engraving Co.
InventorJoseph G. Hotton
Life of this patent
Estimating the term…
Abstract
A method of welding together two thermoplastic surfaces to form a strong watertight bond therebetween comprising the steps of serrating the two surfaces while simultaneously melting the serrations formed therein and pressing the two surfaces together, ridge to ridge and valley to valley, to collapse the ridges and cause the molten thermoplastic material to flow into the valleys until a single continuous watertight seam is formed therebetween.
Claims7
A method of welding together first and second thermoplastic surfaces to form a strong watertight bond therebetween comprising the steps of simultaneously serrating the first and second surfaces by simultaneously softening and shaping said surfaces with a heated forming element interposed therebetween to form ridges and valleys on each of said surfaces;
- withdrawing said forming element;
- and thereafter pressing the first and second surfaces together, with the ridges of the first surface substantially opposite and aligned with the ridges of the second surface to collapse the ridges and to flow the softened thermoplastic material into the valleys until a single continuous watertight seam is formed therebetween.
Dependencies are inferred from the claim text.