GB1566496A - Method for producing a self-copying multi-layer paper product - Google Patents

Abstract

To produce a self-copying multilayer paper product, a wide web (1) of paper is successively printed and provided with a copying layer in successive stations (2a, 2b, 3). In a further treatment station (4), the web (1) of paper is divided by longitudinal blades into a number of longitudinally aligned paper web sections (5), after which the said paper web sections are placed one on top of the other by means of deflection rods (6). These paper web sections, which are combined in groups to form endless multilayer forms, then reach a perforating and/or concertina folding station (8) in which transport perforations can also be applied. The finished forms are then conveyed onwards by conveyor belts (9). The method makes it possible to combine paper web sections having essentially the same paper properties so that they are virtually congruent with one another, in order to avoid uneven deformation of paper, such as shrinking in endless multilayer forms, to a substantial extent. <IMAGE>

Description

(54) METHOD FOR PRODUCING A SELF-COPYING MULTI-LAYER PAPER PRODUCT (71) We, OY WARThILX AB, a Finnish Company, of Box 10230, Helsinki 10, Finland and G. A. SERLACHIUS OY, a Finnish Company, of 35800 Mantta, Finland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a method for producing a self-copying multi-layer paper product or the like.

Usually self-copying multi-layer paper products or the like are produced by first coating a web with a copying layer, whereafter the web is slit into narrow websections which are wound up into rolls.

After this a number of rolls in question are taken for printing of their web-sections, for arranging the web sections one above another and for other possible handling operations, which possibly may all be formed in one and the same machine. One drawback cf this production method is that, starting from the printing phase, it is necessary to handle several short small rolls which slows down the production and raises the price of the final product. Furthermore, it is possible that small rolls brought together from a temporary storage place for printing and afterprinting treatment may be sections of different webs possibly having varying paper quality characteristics, due, for instance, to different pulp composition, basis weight fluctuation and different fibre orientation.Environmental factors and their variations have a different influence on different paper qualities, due to which, for instance, the shrinkage caused by the humidity of the surroundings varies from one web section to another. Consequently, the quality of products formed of superimposed web sections from different webs and intended to be used, for instance, as multi-layer continuous forms, may be inferior, due inter alia to said shrinkage. As a result, when such a form is subsequently filled in, the text may come into incorrect places in the different layers of the form, so that the clarity and legibility of the form may be considerably degraded. Only a partial dislocation of the feeding holes usually used in multi-layer continuous forms of the kind in question is even more harmful. It would probably result in frequent disturbances in the feeding of the form.

The present invention aims to eliminate the above mentioned drawbacks from the production of self-copying multi-layer paper products or the like. The method according to the invention is characterised in that printing and application of a copying layer, in either order, are performed on a broad web, thereafter the web is longitudinally slit into sections, and subsequently the slit web sections are subjected to a finishing treatment, comprising arranging the web sections one above another to produce the desired product.

By the method of the invention it is possible to simplify and speed up in a decisive way the production of the product in question, since it is no longer necessary to handle separately a great number of short small rolls, so that production costs can be reduced. The paper quality in the different layers of the product will not differ substantially, since all the layers have been taken from the same web. Due to this, environment factors have basically the same influence on all the layers of the product, which improves the quality of the multilayer product in question.

When carrying out the coating it is of advantage, if, when so required, only part of the surface of the web and/or both sides of the web can be coated. Especially when producing multi-layer continuous forms, the finishing treatment also includes perforation and zig-zag folding of the web sections. In this connection, the web sections can also with advantage be provided with feeding holes for possible use subsequently for mechanical feeding of the continuous form.

If set forms have to be produced, the different layers of the multi-layer web sections have to be joined at suitable portions in some way, for instance by glueing, and the web sections have to be cut into sheets of suitable size. The relative order and the performance of these treatments, known per se, is chosen to suit the actual situation in the most favourable way. As another possible treatment, for instance, winding of a produced multi-layer web is feasible prior to performing other finishing treatments at a later stage.

Furthermore, several combinations of these different treatments are, of course, feasible.

The forming of the copying layer can be considerably sped up if it is carried out separately in a fast machine, the other treatments being carried out in another machine as described above.

By using turning bars the slit web sections can easily be arranged one above another.

The turning bars can also be arranged so that from the same web two or more different multi-layer web section groups are formed, and necessary treatment is carried out on each group separately, so that from one machine several finished products can be obtained simultaneously.

The invention will now be described, by way of example, with reference to the accompanying drawing, the single Figure of which is a schematic perspective view of apparatus for producing multi-layer continuous forms.

In the drawing, the numeral 1 indicates a web which passes through coating stations 2a and 2b to a printing station 3, and from there to a station 4 for longitudinal slitting.

After this, separate web portions 5 are superimposed by means of turning bars 6 to form two groups at stations 7. Instead, the web portions can, of course, be arranged to form one, or alternatively, more than two groups, so that a corresponding number of multi-layer continuous forms are produced.

After this, the produced multi-layer webs are, for instance, perforated and zig-zag folded, which takes place at station 8. At the same station the punching of feeding holes can also be carried out if desired, but this has not been shown in detail in the example shown in the drawing. The ready-made forms are transported away by means of conveyers 9, for instance, to a storage place.

WHAT WE CLAIM IS: 1. A method for producing a self-copying multi-layer paper product or the like, characterised in that printing and application of a copying layer, in either order, are performed on a broad web, thereafter the web is longitudinally slit into sections, and subsequently the slit web sections are subjected to a finishing treatment, comprising arranging the web sections one above another to produce the desired product.

2. A method according to Claim 1, in which only part of the web surface is coated with a copying layer.

3. A method according to Claim 1 or 2, in which the web is coated with a copying layer on both sides.

4. A method according to any of the preceding claims, in which the finishing treatment also includes perforation and zigzag folding of the web sections.

5. A method according to Claim 4, in which the finishing treatment also includes the punching of feeding holes in the web sections.

6. A method according to any of Claims 1 to 3, in which the finishing treatment includes steps, such as cutting and joining of the web sections, necessary for producing set forms.

7. A method according to any of the preceding claims, in which a web is provided with a copying layer in a first machine from which produced paper rolls are moved to another, more slowly running machine in which the other steps of the method are carried out.

8. A method according to any of the preceding claims, in which the arrangement of the slit web sections, one above another, is made by means of turning bars.

9. A method according to any of the preceding claims, in which, after the slitting, two or more multi-layer web section groups are formed from the same web, said treatment steps being performed separately for each of the groups.

10. A method for producing a selfcopying multi-layer paper product substantially as herein described with reference to the accompanying drawing.

11. A self-copying multi-layer paper product when made by the method claimed in any of the preceding claims.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (11)

**WARNING** start of CLMS field may overlap end of DESC **. holes for possible use subsequently for mechanical feeding of the continuous form. If set forms have to be produced, the different layers of the multi-layer web sections have to be joined at suitable portions in some way, for instance by glueing, and the web sections have to be cut into sheets of suitable size. The relative order and the performance of these treatments, known per se, is chosen to suit the actual situation in the most favourable way. As another possible treatment, for instance, winding of a produced multi-layer web is feasible prior to performing other finishing treatments at a later stage. Furthermore, several combinations of these different treatments are, of course, feasible. The forming of the copying layer can be considerably sped up if it is carried out separately in a fast machine, the other treatments being carried out in another machine as described above. By using turning bars the slit web sections can easily be arranged one above another. The turning bars can also be arranged so that from the same web two or more different multi-layer web section groups are formed, and necessary treatment is carried out on each group separately, so that from one machine several finished products can be obtained simultaneously. The invention will now be described, by way of example, with reference to the accompanying drawing, the single Figure of which is a schematic perspective view of apparatus for producing multi-layer continuous forms. In the drawing, the numeral 1 indicates a web which passes through coating stations 2a and 2b to a printing station 3, and from there to a station 4 for longitudinal slitting. After this, separate web portions 5 are superimposed by means of turning bars 6 to form two groups at stations 7. Instead, the web portions can, of course, be arranged to form one, or alternatively, more than two groups, so that a corresponding number of multi-layer continuous forms are produced. After this, the produced multi-layer webs are, for instance, perforated and zig-zag folded, which takes place at station 8. At the same station the punching of feeding holes can also be carried out if desired, but this has not been shown in detail in the example shown in the drawing. The ready-made forms are transported away by means of conveyers 9, for instance, to a storage place. WHAT WE CLAIM IS:

1. A method for producing a self-copying multi-layer paper product or the like, characterised in that printing and application of a copying layer, in either order, are performed on a broad web, thereafter the web is longitudinally slit into sections, and subsequently the slit web sections are subjected to a finishing treatment, comprising arranging the web sections one above another to produce the desired product.

2. A method according to Claim 1, in which only part of the web surface is coated with a copying layer.

3. A method according to Claim 1 or 2, in which the web is coated with a copying layer on both sides.

4. A method according to any of the preceding claims, in which the finishing treatment also includes perforation and zigzag folding of the web sections.

5. A method according to Claim 4, in which the finishing treatment also includes the punching of feeding holes in the web sections.

6. A method according to any of Claims 1 to 3, in which the finishing treatment includes steps, such as cutting and joining of the web sections, necessary for producing set forms.

7. A method according to any of the preceding claims, in which a web is provided with a copying layer in a first machine from which produced paper rolls are moved to another, more slowly running machine in which the other steps of the method are carried out.

8. A method according to any of the preceding claims, in which the arrangement of the slit web sections, one above another, is made by means of turning bars.

9. A method according to any of the preceding claims, in which, after the slitting, two or more multi-layer web section groups are formed from the same web, said treatment steps being performed separately for each of the groups.

10. A method for producing a selfcopying multi-layer paper product substantially as herein described with reference to the accompanying drawing.

11. A self-copying multi-layer paper product when made by the method claimed in any of the preceding claims.