Package making – Methods – Closing package or filled receptacle
Reexamination Certificate
2011-07-19
2011-07-19
Tawfik, Sameh H. (Department: 3721)
Package making
Methods
Closing package or filled receptacle
C053S371800, C053S374800
Reexamination Certificate
active
07980047
ABSTRACT:
A method of severing and sealing a film formed of a thermoplastic material includes heating a cutting edge implement to a temperature sufficient to melt but not to burn the thermoplastic material, feeding a plurality of layers of the film between the cutting edge implement and an opposing surface, and moving the cutting edge implement, which is preferably a supported hot wire, and the opposing surface relative to one another to pinch the plurality of layers of film therebetween. Thereafter, any relative lateral movement between the cutting edge implement, the film, and the opposing surface is suspended, while the cutting edge implement and the opposing surface are relatively biased together with the plurality of layers of film pinched therebetween, until the cutting edge implement cuts through the plurality of layers of film, contacts the opposing surface, and seals the plurality of layers of film together.
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International Search Report in Int'l Appln. No. PCT/US01/21830.
Gangler Stephen P.
Hoffman Jeffrey S.
Velez P. Gregory
Woody Clark
S.C. Johnson & Son Inc.
Tawfik Sameh H.
Weeks Gloria R
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