Coating apparatus – Immersion or work-confined pool type – Work-confined pool
Patent
1985-06-19
1987-01-27
McIntosh, John P.
Coating apparatus
Immersion or work-confined pool type
Work-confined pool
156291, B05C 502
Patent
active
046387579
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for spreading jointing adhesive on both sides of a crosswise tear-off perforation in a paper web which makes one side of form envelopes, said apparatus comprising a glue or adhesive spreading roll and a counter roll for passing therebetween said paper web with crosswise tear-off perforations.
The generalization of computerized billing has led to the development of invoice forms which are sealed between two continuous paper webs in a manner that the forms, together with their envelopes, can be later detached from each other at crosswise tear-off perforations. In the preparation of such forms and their envelopes, the forms are set upon a paper web making one side of the envelope between the perforations, and a paper web making the other side of the envelope is passed through a jointing adhesive spreading device, in which jointing adhesive is spread or applied on each side of a perforation, the paper webs being placed against each other so as to bring the perforations in alignment with each other whereby the ends of said envelopes on each side of the perforations will be glued to each other. Also the sides of paper webs are conventionally glued to each other but this procedure involves no problems. On the other hand, spreading of jointing adhesive on each side of a perforation requires extremely high accuracy since, even after the sides of the envelopes have been glued to each other, the adhesive material must not spread to a perforation nor extend to the edge of a form itself so that the form can be pulled out of the envelope. The space between a perforation and a form edge must be kept as narrow as possible so that the lengths of a form and envelope do not unreasonably differ from each other. Both the dosage and positioning of the amount of adhesive must be done most accurately. This requirement is not sufficiently met with available adhesive spreading equipment, designed for this purpose, their particular defect being that such adhesive spreading principle limits the equipment's productive capac- ity.
An object of the invention is to provide for the above purpose such an adhesive spreading apparatus that can be worked at a high rate of production and at high accuracy.
This object is achieved by an apparatus of the invention on the basis of the characterizing features set out in the annexed claims.
One embodiment of the invention will now be described in more detail with reference made to the accompanying drawings, in which
FIG. 1 is a side view of an apparatus of the invention.
FIG. 2 shows an adhesive spreading roll for said apparatus and
FIGS. 3 and 4 show another embodiment of an adhesive spreading roll.
The apparatus comprises on each side thereof vertical frame plates 1, mounted at a distance (orthogonal to the plane of drawing) from each other. Extending between frame plates 1 are an adhesive spreading roll 2 and a counter roll 6, a paper web 7 for making one side of form envelopes being passed around the latter. Web 7 is provided with crosswise tear-off perforations at set intervals, corresponding to the length (or width) of a form envelope to be produced. On each side of these tear-off perforation lines as close to perforation as possible must be spread jointing adhesive which must not spread to perforation when the web will later be glued upon a paper web which makes the other side of an envelope. A chain of finishing envelopes, with the forms sealed therein, must be such that it can later be separated along perforation lines into separate envelopes after running said chain of envelopes through a computer printer, which through an envelope prints necessary date on the forms and address information on the envelope.
For this spreading or application of jointing adhesive, said adhesive spreading roll 2 is fitted with two parallel, lengthwise of the roll extending arrays of glue nozzles 2a (FIGS. 2 and 3). Glue or adhesive can be passed into nozzles 2a, as set forth in e.g. FI Patent application No. 830385. Another alternative is to build inside a roll 2 a
REFERENCES:
patent: 3034476 (1962-05-01), Didde et al.
patent: 4249984 (1981-02-01), Vermehren
patent: 4295445 (1981-10-01), Kopenhauer
patent: 4332212 (1982-06-01), Jesme
McIntosh John P.
Oplatek Oy
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