Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Patent
1984-01-04
1986-12-02
Husar, Francis S.
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
493143, 493134, 493136, 493176, 493147, 493182, 53563, B31B 144
Patent
active
046262342
DESCRIPTION:
BRIEF SUMMARY
This invention relates to tray-type cartons, in particular such cartons which are generally rectangular and erected by folding from a flat blank of cardboard or other foldable sheet material and which, furthermore, have a peripheral flange on to which a closure lid for the carton may be attached, for example by heat-sealing of the lid margin to the free upper surface of the flange.
In the erection of rectangular tray-type cartons having peripheral flanges from flat blanks, it is known to form the flanges by the same operation as is used to fold up the side wall panels of the cartons in relation to the carton bases, and to secure those panels in their desired side wall forming relation by means of gusset folds formed from gusset panels which join the side wall panels integrally together; the gusset folds are secured against the side wall at, for example, the outside surface of the side wall panels at the ends of the carton. Such a method, however, has several disadvantages attendant upon the formation of the peripheral flanges, and it is an object of the present invention to provide an improved method and apparatus for erecting a carton as recited above, including the formation of the peripheral flange.
According to the invention from a first aspect, there is provided a method of erecting from a blank of foldable sheet material a rectangular tray-type carton having a base formed from a base panel of the blank, a side wall upstanding from the base and formed from four side wall panels, gusset folds secured against the side wall at the corners of the carton and formed from gusset panels by which the side wall panels are joined integrally together, and a continuous peripheral flange outturned from the side wall around the mouth of the carton, the flange being formed from elongate panels carried by the side wall panels and formed at their ends with tabs which are secured together in overlapping relation at the corners of the carton, the method comprising: be uppermost in the erected carton, panels in relation to the base panel whilst folding the gusset panels to form the gusset folds, such folding being accompanied by movement of the elongate panels with the side wall panels as coplanar extensions thereof with the exception of the said uppermost ones of the tabs, station, relation to the side wall and into generally coplanar relation with one another, with the said uppermost tabs overlying other ones of the tabs at the corners of the carton, and form the continuous peripheral flange.
In accordance with the invention from a second aspect there is provided an apparatus for performing the method defined in the previous paragraph and comprising: to fold up from the plane of the blank those of the tabs which are to be uppermost in the erected carton, and a punch and die arranged to form the side wall by folding up the side wall panels in relation to the base panel whilst folding the gusset panels to form the gusset folds, such folding being accompanied by movement of the elongate panels with the side wall panels as coplanar extensions thereof with the exception of the said uppermost ones of the tabs, first station and to transport it to a second and third stations, outwardly in relation to the side wall so as to form the peripheral flange and to bring the tabs into overlapping relationship at the corners of the carton, and together to complete the peripheral flange.
Preferably the pivotal fingers are arranged to be operated by a cam mechanism associated with the punch. The conveyor may be intermittently driven to index the cartons through the second and third stations. Preferably the folding means is in two parts arranged to operate sequentially, first on the leading and trailing edges and then on the sides of the carton. The folding means may comprise a vertically reciprocable actuating assembly carrying spring-mounted former members to effect a first folding and vertical pins movable through apertures in the former members to effect a further folding of the elongate panels.
The sealing means at the third station p
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Husar Francis S.
Jones David B.
Metal Box Public Limited Company
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