Manufacturing container or tube from paper; or other manufacturi – Control means energized in response to activator stimulated... – Responsive to work material – the product or means engaging...
Patent
1987-06-22
1989-05-02
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Control means energized in response to activator stimulated...
Responsive to work material, the product or means engaging...
493 29, 493 35, 493205, 493206, 493208, B31B 100, B31B 164
Patent
active
048264750
DESCRIPTION:
BRIEF SUMMARY
The extremely rapid development within the areas of information and communication with regard to printed sheets, messages of different kind, envelopes etc. has been accompanied by a similarly very large technical contribution with regard to the actual handling technique for the printed product. For example, it has been known for a long time to provide an envelope with perforated, tear-off edges from one and the same printed sheet, the edges of the sheet being coated before or after printing with some type of glue, e.g. of the moisture or hotmelt type. The moisture type is usually a water-based composition and is applied to the sheet without increase in temperature, sealing then taking place under a certain amount of pressure and possible the supply of heat. The hotmelt type is a plastic glue, which must be applied hot (in a liquid state) and which rapidly solidifies after application. For sealing, the glue must be heated once again with the simultaneous application of pressure.
The sheet which is to be sealed, i.e. glued together along the edges to form an envelope, is first folded so that two half portions of it come against each other, these portions then being pressed together to form an adhesive joint along the edges. The technique for this must be adjusted to the type of glue used. For the moisture type, only a light compression of the two sheet halves is required as a rule, with or without heating, whereas the hotmelt type requires heating to the melting point of the glue, or at least to its softening point, with simultaneous compression.
In recent years, printing in laser printers (so-called electronic printing) has been in a state of very rapid development. Electronic printing means that all text, with possible figures and pictures, is formed by a special kind of carbon powder, so-called toner, which is coated on to the paper surface electrostatically, using a now well-known technique, and is subsequently melted into the surface under heating and compression. The toner, which is a finely divided substance, comprises a composition of carbon powder and some suitable type of powdered plastics. Each printed portion of the paper surface will thus be coated with a thin, somewhat rolled-out layer of toner.
It has now been found that such a toner layer has a certain adhesive capacity, if it is once again heated during simultaneous compression. Particularly heavy adhesion is obtained if two toner coated surfaces are heated and pressed together.
In connection with this observation, a method has been developed by Rank-Xerox, which in principle signifies that the sheet, which is to be sealed to form an envelope, is coated with a comparatively narrow toner bead along the edges, or along the portions which are to be adhered to each other. The sheet is then folded so that the beads of toner coating are exactly opposite each other, after which a seal can be made. The method is described in the European patent application No. 85200178.4.
The present invention relates to a machine for sealing material in sheets which has been coated with toner beads by electronic printing for sealing the sheet to form an envelope.
The machine in accordance with the invention is characterized by an implementation such that the sheet, after folding to the intended envelope format, where two toner beads are always situated opposite each other, is first caused to pass through a first sealing zone, where one or more first toner beads are simultaneously sealed, and is subsequently caused to pass through a second sealing zone where one or more second toner beads, laid at 90.degree. to the first toner beads, are simultaneously sealed. The second sealing zone is arranged at 90.degree. to the first sealing zone, and in a stop position between both sealing zones there is arranged an advancing mechanism for rapid, automatic advancing of the envelope between the sealing zones.
Each sealing zone further includes heated, driven pairs of sealing discs, each pair comprising an upper and a lower disc adapted for elastic compression of the envelope to
REFERENCES:
patent: 2114625 (1938-04-01), Bergstein
patent: 2242799 (1941-05-01), Moore
patent: 3985067 (1976-10-01), Livio et al.
patent: 4011798 (1977-03-01), Bambara et al.
Schmidt Frederick R.
Showalter Robert
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