Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1980-02-07
1982-02-02
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
73 73, 162DIG3, 162DIG6, 264129, 264134, 264322, 264340, 427 8, 4274301, 4274344, 427439, 493 8, 493 85, 493275, 493329, B29C 1703, B31D 502, B31F 136
Patent
active
043138993
ABSTRACT:
Tearing, blistering, delamination and other defects in deep drawn plastic laminated paperboard containers are eliminated by adding controlled amounts of warmed moisture to the paperboard immediately prior to forming thereof. Water is heated to a desired temperature and is applied by in-line processing equipment to the unlaminated side of the paperboard which functions to both soften and paperboard and preheat the laminate. By heating both the male and female parts of a die press employed for forming the preheated, softened laminate into the container, preheating the laminate using warm water prior to forming and, continuously controlling the moisture added to the paperboard, the degree of stress imposed on the plastic layer of the laminate and the resulting defects in the formed container are significantly reduced.
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Whittington, Whittington's Dictionary of Plastics, Technomic, Stamford, Conn. (1975), p. 258.
Champion International Corporation
Hoag Willard E.
Sommer Evelyn M.
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