Package making – Methods – Wrapping contents including cover forming
Reexamination Certificate
1999-07-06
2001-05-01
Vo, Peter (Department: 3721)
Package making
Methods
Wrapping contents including cover forming
C053S477000, C053S232000, C053S234000, C053S370700, C053S371600, C053S374600, C053S586000
Reexamination Certificate
active
06223506
ABSTRACT:
The present invention relates to a method of wrapping a product in a sheet of heat-seal wrapping material.
The present invention may be used to particular advantage on machines for cellophaning packets of cigarettes, to which the following description refers purely by way of example.
BACKGROUND OF THE INVENTION
On known machines for cellophaning packets of cigarettes, a sheet of heat-seal wrapping material is folded onto one wall of the product to superimpose two portions of the sheet of wrapping material by means of a folding device, which gradually releases the sheet of wrapping material once this is folded. When the folding device is fully detached from the wall of the product, a sealing surface of a sealing head is brought into contact with the superimposed portions of the sheet of wrapping material to seal and so stabilize the sheet of wrapping material in the folded configuration.
On known cellophaning machines of the above type, the two portions of the sheet of wrapping material folded one on top of the other against the wall of the product are left substantially free during the time interval between being released by the folding device and being engaged by the sealing surface. During which time, springback of the sheet of wrapping material may cause even a substantial alteration in the configuration of the sheet, thus impairing the quality of the finished wrapping.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method of wrapping a product in a sheet of heat-seal wrapping material, designed to eliminate the aforementioned drawback, and which at the same time is both straightforward and cheap to implement.
According to the present invention, there is provided a method of wrapping a product in a sheet of heat-seal wrapping material, the method comprising the steps of causing said sheet of wrapping material to engage folding means for folding the sheet of wrapping material about said product to superimpose portions of the sheet. of wrapping material and obtain at least two superimposed portions; causing said sheet of wrapping material, once folded, to be released gradually from said folding means; and establishing contact between said superimposed portions and a sealing surface of a sealing head to seal the superimposed portions to each other; characterized in that said contact is established by bringing the sealing surface gradually into a position facing the superimposed portions as the superimposed portions are gradually released from the folding means.
The present invention also relates to a machine for wrapping a product in a sheet of heat-seal wrapping material.
According to the present invention, there is provided a machine for wrapping a product in a sheet of heat-seal wrapping material, the machine comprising folding means; first actuating means for causing said sheet of wrapping material to engage said folding means to fold the sheet of wrapping material about said product and superimpose portions of the sheet of wrapping material to obtain at least two superimposed portions, and for causing said sheet of wrapping material, once folded, to be released gradually from said folding means; a sealing head having a sealing surface; and second actuating means for establishing contact between said superimposed portions and said sealing surface to seal the superimposed portions to each other; characterized in that said second actuating means are so designed as to establish said contact by bringing the sealing surface gradually into a position facing the superimposed portions as the superimposed portions are gradually released from the folding means.
REFERENCES:
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patent: 5085028 (1992-02-01), Boriani et al.
patent: 5123226 (1992-06-01), Near
patent: 5410858 (1995-05-01), Osti et al.
patent: 5701725 (1997-12-01), Neri et al.
patent: 5794413 (1998-08-01), Draghetti
patent: 5839253 (1998-11-01), Draghetti
patent: 6000199 (1999-12-01), Boldrini
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patent: 2258187 (1993-02-01), None
Ghini Marco
Spatafora Mario
G. D Societa'per Azioni
Huynh Louis
Ladas & Parry
Vo Peter
LandOfFree
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