Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1987-11-17
1992-08-11
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
2641771, 264178R, 2642107, 264281, 264160, 264245, 425 67, 425377, B29C 4704, B29C 4790
Patent
active
051376733
ABSTRACT:
Plasticized polyvinyl butyral sheet optionally containing a gradient color band is formed by continuously extruding a sheet having a predetermined region across its width formed from melt issuing from a die at an increased mass flow rate in comparison with other portions of the melt forming the rest of the sheet and then forwardly distorting such sheet immediately after forming by preferentially stretching the side containing the predetermined region to form an arcuate shape of substantially uniform thickness. Arcuately shaped sections are then cut from the sheet to form discrete, shaped interlayer blanks having improved thickness uniformity and dimensional stability providing improved performance when used in laminated safety glass.
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Bourcier David P.
Esposito Robert A.
Farrington William J.
Heitbrink Jill L.
Monsanto Company
Murphy Michael J.
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