Thermoformed packages

Abstract

Abstract A THERMOPLASTIC CARTON BLANK HAVING AT LEAST ONE SURFACE THERMOFORMED, PREFERABLY THE TOP OR BOTTON, TO CONFORM TO THE CONTOURS OF THE ARTICLE TO BE PACKAGED IN THE CARTON MADE FROM THE BLANK. THE CARTON BLANK IS SCORED, CREASED AND THEN FOLDED INTO A CARTON PARTICULARLY USEFUL IN PACKAGING ARTICLES THAT COULD BE BROKEN OR MARRED IN THE ABSENCE OF AN OUTER WRAP SUCH AS GLASS CONTAINER, BREAKABLE PLASTICS, POLISHED METAL, CERAMIC METALS, DELICATE INSTRUMENTS AND THE LIKE. THE THEROFORMED PORTION OF THE SURFACE OF THE CARTON ASSISTS IN RESTRAINING MOVEMENTS OF THE PACKAGED ARTICLE AND THE THERMOPLASTIC MATERIAL CUSHIONS THE ARTICLE. THE THERMOPLASTIC MATERIAL PREFERABLY IS A LAMINATE OF (A) A CORE OF ORIENTED CLOSED CELL FOAM HAVING AN ELONGATION OF LESS THAN ABOUT 50% AND CONSISTING ESSENTIALLY OF STYRENE POLYMER HAVING A TENSILE MODULUS GREATER THAN 150,000 P.S.I.,AND (B) BONDED TO BOTH SIDES OF THE CORE IS A THERMOPLASTIC FILM HAVING A TENSILE MODULUS GREATER THAN 150,000, A PERCENT ELONGATION AT BREAK GREATER THAN THE FUNCTION 1$R WHERE T IS THE THICKNESS OF THE FILM AND R IS THE RADIUS OF A CREASING EDGE WHEN THE CARTON BLANK IS FOLDED AND IS THERMOFORMABLE WITHIN A TEMPERATURE RANGE OF ABOUT 50* TO 230*C.

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