Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1995-04-17
1997-12-16
Hail, III, Joseph J.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493255, 493917, B42D 1508, B31B 1900
Patent
active
056978790
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method for folding and gluing a sheet of paper that contains information and serves both as a letter and an envelope, wherein the sheet is folded transverse to its parallel lateral edges, and said lateral edges, the end edge of the last folded sheet portion and the transverse edge are closed by glue joints, and the folded and glued lateral edges and the transverse edge are perforated, and wherein the travel direction of the sheet is changed by about 90.degree. after treatment of the lateral edges.
BACKGROUND OF THE INVENTION
In previously known folding gluing methods the sheet of paper is passed along a straight path throughout the process in a folding gluing machine operating on a cold sealing principle. To begin with, glue is applied to two parallel lateral edges of the sheet. Subsequently the sheet is forwarded to grooved rolls, which have glue nozzles in the grooves for spraying points of glue on one end of the sheet. The sheet is then folded perpendicular to the lateral edges. Due to the folding and gluing, the sheet forms a closed document, e.g. a letter ready for mailing. Usually the sheet is folded twice, and the two lateral edges of the folded and glued sheet are perforated to facilitate opening. The glued end of the sheet is opened by tearing. In documents like this, the actual information is not written on the same side of the unfolded sheet as the information about the sender and the receiver.
The drawback of the method and the closed document produced by it is that glue points cannot be sprayed sufficiently close to one another on the end of the sheet to make it impossible for an outsider to peek at the letter by opening it slightly between the glue points. It is true that double folding restricts the possibility of peeking at the document to some extent, but the condition is that text be printed on both sides of the unfolded sheet, as stated above. This in turn reduces the rate of printing of the sheet.
It is also known to produce pre-glued sheets of paper in which all information is to be printed on one side and which are folded only once. Documents folded from these sheets are well protected against outsiders, but they require a specific heat-sealing folding machine. Pre-glued sheets are also very expensive.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above drawbacks and to provide a method by which documents well protected against outsiders can be produced without the use of pre-glued sheets and in which gluing can be performed by conventional cold sealing.
The objects are achieved with the method of the invention, which is characterised in that transverse gluing of the end edge of the last folded sheet portion and the transverse edge is performed just before perforation of these parts by opening slightly the sheet portions that are to be glued together and by spraying glue on the slots.
The essential difference of the present invention over the previously known method is that transverse gluing for final closing of the sheet, i.e. gluing in a folding direction of the sheet, is not performed until after the sheet has been folded and is performed without the known gluing rolls. For the transverse gluing, the travel direction of the sheet is changed to be perpendicular to the earlier travel direction, whereby glue can be sprayed on the joints to be glued from the sides of the folded sheet as the sheet moves forward. This in turn makes it possible to provide a uniform glue joint, whereby the text on the closed sheet cannot be read without opening the sheet.
In the method of the invention all the information contained in the sheet can be printed on one side of the unfolded sheet even though the sheet is then folded several times. Single-sided printing requires only about half as much time as double-sided printing.
BRIEF DESCRIPTION OF THE DRAWINGS
In the following the invention will be described in greater detail with reference to the attached drawings, in which
FIG. 1 shows a folding gluing machine used in carrying out th
REFERENCES:
patent: 4928875 (1990-05-01), Hutchinson
patent: 5174493 (1992-12-01), File
patent: 5289972 (1994-03-01), Sauerwine
patent: 5294041 (1994-03-01), Whiteside
patent: 5328438 (1994-07-01), Crowley
patent: 5360159 (1994-11-01), Perriman
patent: 5360160 (1994-11-01), Sauerwine
patent: 5370304 (1994-12-01), Sauerwine
patent: 5376048 (1994-12-01), Whiteside
patent: 5391136 (1995-02-01), Makowka
patent: 5402934 (1995-04-01), Sauerwine
Day Christopher W.
Hail III Joseph J.
Mail Systems Oy
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