Manufacturing container or tube from paper; or other manufacturi – With coating – Adhesive
Reexamination Certificate
1997-04-29
2001-02-13
Hail, III, Joseph J. (Department: 3205)
Manufacturing container or tube from paper; or other manufacturi
With coating
Adhesive
C493S332000, C493S399000, C493S947000, C412S008000, C281S036000
Reexamination Certificate
active
06186935
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a method and an apparatus for producing folders of the kind comprising two cover sheets, a spine, which is connected with the cover sheets by means of creasing lines, and a binding agent, which is applied to the inside of the spine and which is activable to connect sheets inserted between the cover sheets to the spine.
Folders of this kind have been widely used, especially folders using hot-melt glue as the binding agent. On insertion of a stack of sheets in the folder into contact with the hot-melt glue in the spine of the folder, the folder with contents is placed in a so called binding machine, in which the hot-melt glue is heated such that the stack of sheets will sink into the glue. After cooling, the stack of sheets is connected with the spine of the folder.
PRIOR ART
There are previously known a variety of methods and devices for manufacturing folders of the above described type.
A common method is attaching a solid strip of glue to a flat folder blank, which will then be folded along creasing lines on either side of the strip of glue to define a finished folder. Attachment of the strip of glue and forming of the creasing lines may be carried out, for example, in the way disclosed in the Swedish patent application as published for opposition 413 647, and the subsequent folding may take place, for example, in the way described in the Swedish patent application as published for opposition 431 975.
These known methods provide folders of high quality, however, it is necessary to use two different machines, increasing the costs of manufacture. Further, the side edges of the strip of glue will not adhere to the cover sheets in the finished folder, which under certain circumstances may cause sheets located on the outside in a stack of sheets to be situated between the strip of glue and the cover sheets in the subsequent binding process, so that said sheets will not adhere to the spine of the folder.
Another known method comprises the steps of forming creasing lines on a flat folder blank, or on a web of material, from which folder blanks will then be separated, and immediately thereafter spraying hot-melt glue between said creasing lines. A method like this is disclosed, for example, in the German Offenlegungsschrift 2 611 242.
The major disadvantages of the latter method is that the folder blank must be folded in a subsequent folding operation, that the strip of glue will be uneven and will partly cover the creasing lines, and that the side edges of the strip of glue will not adhere to the cover sheets of the finished folder.
In order to solve the problem of the side edges of the strip of glue not abutting against the cover sheets of the finished folder, a variety of solutions have been proposed.
A solution of this kind is disclosed in the U.S. Pat. No. 4,289,330 showing that special strips of glue are attached in the area of connection between the cover sheets and the folder spine provided with a strip of glue. Manufacture of a folder of this kind is complicated and expensive and is difficult to carry out automatically.
Another solution, evident from the U.S. Pat. No. 4,129,471, comprises the spraying of melted glue onto a flat folder blank, whereupon the blank is folded in order to define two cover sheets and a spine. Folding is carried out along lines located in the glue area. The major disadvantages of this solution is that folding is difficult to carry out and that the folding edges will be irregular and unsharp.
SUMMARY OF THE INVENTION
It is an object of the present invention to eliminate, at least partly, the disadvantages of previously known methods and devices of the above kind and to provide a method and an apparatus making it possible to produce high-quality folders at high speed.
This object is fulfilled in that the invention is provided with the features stated in the characterizing portions of the claims.
REFERENCES:
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patent: 5062754 (1991-11-01), Bolin
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patent: 5120176 (1992-06-01), Bhatia
patent: 5203590 (1993-04-01), Ranson
patent: 3811133 (1989-09-01), None
patent: 2072096 (1981-09-01), None
patent: 2186526 (1987-08-01), None
patent: 2197256 (1988-05-01), None
patent: 452287 (1987-11-01), None
Bindomatic AB
Cooper & Dunham LLP
Day Christopher W.
Hail III Joseph J.
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