Preparation of sheet stock having longitudinal external weakenings therein and product thereof

Claim 1

THE METHOD OF PREPARING NARROW STRIPS OF MATERIAL EACH HAVING AN INTERNAL DISCONTINUITY BETWEEN SURFACE LAMINATIONS, THE LAMINATIONS BEING CONNECTED AT THE LAT ERAL EDGES OF THE DISCONTINUITY, WHICH COMPRISES PREPARING A BILLET OF THE MATERIAL WITH A PLURALITY OF INTERNAL LONGITUDINAL CHANNELS SPACED LATERALLY FROM ONE ANOTHER AND FROM THE LONGITUDINAL EDGES OF THE BILLET BY PORTIONS OF SOLID METAL EXTENDING FROM FACE TO FACE OF THE BILLET, SAID CHANNELS CONTAINING EXTENSIBLE WELD-PREVENTING MATERIAL, SAID BILLET HAVING A PLURALITY OF LONGITUDINAL EXTERNAL GROOVES AT A ROLL-ENGAGING FACE THEREOF, EACH OF SAID FGROOVES BEING LOCATED OPOSITE ONE OF THE SAID SOLID METAL PORTIONS, THE PARTS OF SAID SOLID METAL PORTIONS BENEATH THE ROOTS OF SAID GROOVES BEING EFFECTIVE TO MAINTAIN INTEGRITY OF THE BILLET FROM SIDE TO SIDE DURING ROLLING, PLACING A WELD-PREVENTING MATERIAL ON A WALL OF EACH GROOVE, ROLLING THE BILLET LONGITUDINALLY WHEREBY TO CAUSE LATERAL CLOSURE OF THE GROOVES AND REDUCTION OF THE TOTAL THICKNESS OF THE BILLET TO THAT DESIRED FOR THE NARROW STRIPS WHEREWITH THE DIMENSION OF THE RESIDUES OF SAID WELD-PREVENTING MATERIAL IN THE DIRECTION OF THE THICKNESS OF THE STRIS IS REDUCED COORDINATELY WITH THE REDUCTION OF SUCH TOTAL THICKNESS, AND THEN APPLYING FORCES TO THE ROLLED PRODUCT WHEREBY TO OVER-STESS AND EFFECT SEPARATION ALONG THE LINES OF SAID RESIDUES OF THE WELD-PREVENTING MATERIAL APPLIED TO THE GROOVE WALLS AND THEREBY SEPRATE THE ROLLED PRODUCT INTO A PLURALITY OF NARROW STRIPS.

Claim 2

THE METHOD OF PREPARING NARROW STRIPS OF MATERIAL EACH HAVING AN INTERNAL DISCONTINUITY BETWEEN SURFACE LAMINATIONS, THE LAMINATIONS BEING CONNECTED AT THE LAT ERAL EDGES OF THE DISCONTINUITY, WHICH COMPRISES PREPARING A BILLET OF THE MATERIAL WITH A PLURALITY OF INTERNAL LONGITUDINAL CHANNELS SPACED LATERALLY FROM ONE ANOTHER AND FROM THE LONGITUDINAL EDGES OF THE BILLET BY PORTIONS OF SOLID METAL EXTENDING FROM FACE TO FACE OF THE BILLET, SAID CHANNELS CONTAINING EXTENSIBLE WELD-PREVENTING MATERIAL, SAID BILLET HAVING A PLURALITY OF LONGITUDINAL EXTERNAL GROOVES AT A ROLL-ENGAGING FACE THEREOF, EACH OF SAID FGROOVES BEING LOCATED OPOSITE ONE OF THE SAID SOLID METAL PORTIONS, THE PARTS OF SAID SOLID METAL PORTIONS BENEATH THE ROOTS OF SAID GROOVES BEING EFFECTIVE TO MAINTAIN INTEGRITY OF THE BILLET FROM SIDE TO SIDE DURING ROLLING, PLACING A WELD-PREVENTING MATERIAL ON A WALL OF EACH GROOVE, ROLLING THE BILLET LONGITUDINALLY WHEREBY TO CAUSE LATERAL CLOSURE OF THE GROOVES AND REDUCTION OF THE TOTAL THICKNESS OF THE BILLET TO THAT DESIRED FOR THE NARROW STRIPS WHEREWITH THE DIMENSION OF THE RESIDUES OF SAID WELD-PREVENTING MATERIAL IN THE DIRECTION OF THE THICKNESS OF THE STRIS IS REDUCED COORDINATELY WITH THE REDUCTION OF SUCH TOTAL THICKNESS, AND THEN APPLYING FORCES TO THE ROLLED PRODUCT WHEREBY TO OVER-STESS AND EFFECT SEPARATION ALONG THE LINES OF SAID RESIDUES OF THE WELD-PREVENTING MATERIAL APPLIED TO THE GROOVE WALLS AND THEREBY SEPRATE THE ROLLED PRODUCT INTO A PLURALITY OF NARROW STRIPS.