Package making – Methods – Wrapping contents including cover forming
Patent
1992-02-06
1993-11-30
Culver, Horace M.
Package making
Methods
Wrapping contents including cover forming
53465, 53214, 533729, B65B 1104, B65B 5110, B65B 5120, B65B 5122
Patent
active
052653994
ABSTRACT:
The present invention concerns a method and assembly for wrapping paper rolls in a wrapping material (12). The method employs such wrapping material that incorporates a heat-meltable laminate layer (26). According to the method the paper roll (23) is rotated on support rolls (13), the wrapper (12) is guided about the roll (23) so that the laminate layer (26) comes against the roll, the wrapper (12) is adhered to the roll by applying energy onto the wrapper in order to attain the melting of the plastic film laminate, whereby the wrapper (12) adheres to the roll (23), and the roll (23) being rotated is wrapped into at least one turn of the wrapper. According to the invention the wrapper laminate layer is melted from the laminate side to adhere the wrapper to the roll being wrapped, and when necessary, the area and/or energy density of melting energy application onto the wrapper material is varied in the direction of the center axis of the roll in order to achieve a desired pattern of adherence. The assembly according to the invention comprises a melting unit, which is divided in at least two melting zones, and said melting zones can be controlled partially or entirely independently from each other and can be directed against the surface of the wrapper material (12) in order to produce the thermal effect necessary for at least a partial melting of said laminate layer (26).
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Nieminen Hannu
Niskanen Tapio
Culver Horace M.
Valmet Paper Macinery, Incorporated
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