JPH03284999A - Method and device for sealing paper - Google Patents

Abstract

PURPOSE: To enhance unsealing resistance and durability at a sealed part by setting surface moisture of two papers subjected to action from a knarling means within a range specified for the dry weight of paper. CONSTITUTION: Heads 18 of two sprays are suitable for spraying a cardboard through an appropriate distance and the cardboard is wetted at a wetting station until moisture of 5-98 wt.% is attained so that it can be subjected to action from knarled rollers 4, 4'. It is then fed to a second wetting station 19 and wetted by means of a spray nozzle 20. The spray nozzle 20 is movable in the arrow direction F and the cardboard M is stopped at the station 19 only for a time required for wetting. A station 21 for sealing through action from knarled rollers is disposed on the downstream side of the station 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention provides a surface bond along at least one edge of the paperboard, i.e. a self-enveloping (s
It relates to sealing envelopes such as elf-enveloping forms.

(Prior Art) In recent years, self-enveloping envelopes have been used especially for printed matter such as bills and cover letters and mail from general companies and public service companies (electricity, gas, telephone, water, etc.). It is as widespread as it is. Such invoices and cover letters are
It may be issued for a large number of customers on a deadline basis (actually every two months) and mailed or delivered.

When mailing, it is necessary to have one opening in the envelope for postal inspection in order to receive a service that allows mailing at a lower tax rate than the normal fee, subject to postal inspection.

The paperboard for self-enveloping envelopes is supplied to a billing and printing center as a separable continuous paper, where the customer's address and other information are printed, and then folded into envelopes and sent for mailing or delivery. .

Here, in the second half of the folding process, the paperboard is folded according to the fold lines parallel to each other so that two or three parts are formed. One edge of the paperboard is closed. The paperboard will then be sealed on at least two of the three edges that are not yet closed, depending on whether it is necessary to leave one opening for postal inspection.

According to known and used sealing techniques, a predetermined portion of the paperboard that has not yet been folded, except to form an unused line of weakness for tearing and separating the sections and/or edges of the paperboard, is used. A reversible or irreversible adhesive is selected and applied to the part, depending on whether the envelope is likely to be opened and sealed multiple times.

A popular type of self-enveloping envelope is a paperboard surface that has been folded several times, with adhesive applied along each edge of the blank that must be matched to each other.

(Problem to be Solved by the Invention) This fact is based on Italian Patent No. 1.1 filed on November 24, 1983 by the same inventor as the inventor of the present invention.
As discussed in detail in the first half of No. 69,138, these are not simply trivial shortcomings or problems.

In the above mentioned Italian patent, means are disclosed for solving the technical problem of sealing envelopes, in particular self-enveloping envelopes. The technical problem in this case is not so much the process of knurling the edges to be sealed;
Rather, it consists in the action of said rollers on the edges of the envelopes while the opposing knurl rollers pass over the edges of the overlapping and matched envelopes to be sealed.

That is, the envelope paperboard between the two rollers is subjected to an interference pressure of [1-ra].
sure) is applied, and in this state, if the overlapping edges of the paperboard are sealed together at three locations, the surface of the paperboard will be deformed.

It is clear that the solution in the Italian patent is E+W only if the envelope is sealed so that it cannot be opened without tearing it.

However, in order to carry out such conventional sealing successfully, it is necessary to carefully control the mechanical conditions to be carried out and to rely on the paper having certain properties for the fruit. It will end up being put away. As mentioned above, the certain fact here refers to the overlapping part of two paperboards, or the uneven part of the surface of two knurling rollers (
relieved and depressed por
When the edges of the paper under the action of tions are instantly deformed and sealed.

Any improvements to the deformation of the paper surface will lead to improvements in the sealing method, and this proposed modification will lead to the removal of the date from the numbers handled by the postal service, such as in registered mail. It is clear that it will be suitable for the case in which

(Means for Solving the Problems) In the present invention, in a method for sealing two sheets of paper that have been subjected to the action of a knurling means, the water content on the surface of the paper is determined immediately after the paper has been subjected to the action of the knurling means. , by setting the moisture content of the edges of the paper surface to be sealed within the range of 5 to 98% by weight compared to the dry weight of the paper, or by setting the moisture content of the edge of the paper surface to be sealed to The above problem was solved by setting the water content within the range of 5 to 98% by weight, which is higher than the water content of the desired portion.

Furthermore, the present invention has attempted to solve the above problem by providing a paper sealing device in which a means for moistening the surface of the paper is provided upstream of the knurling means.

(Function) When a knurling process is performed on the paper that has been subjected to the moistening process, water permeates into each other between the paper fibers forming the edge portions of the two sheets of paper. As a result, the sealed portion has resistance to opening and durability as long as it is not broken.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

(Example) The paperboard M shown in FIGS. 1 to 3 is divided into four sections A, B, C, and D by two fold lines IO and 11 that are perpendicular to each other.

The polygonal line 10 is formed by X-rays 10a and 10b. Segments adjacent to each other (A.

B) and (C, D) are bent in opposite directions, followed by folding line If, and then folding along folding line IO.

The plurality of lines I2 are weakened lines, for example, consisting of a plurality of continuous holes, which can be torn along the side edges of the envelope B corresponding to the lines 12, as shown in FIG.

Reference numerals 13, 14, and 15 in each of the sections A, B, C, and D are strip-shaped edges separated by each of the weakening lines I2.

As is clear from FIGS. 1 to 3, a paperboard M printed out by a printer is shaped into a bill or a cover letter, for example, and is made to be able to be divided into two areas. i.e. sections A and B for the actual invoice part and sections C and D for the postal and/or bank payment statement.
As shown in FIG. 2, it is first bent along a bending line 11 as a center line, and then, as shown in FIG. 3, it is bent again along the X-ray 10a of the bending line 10, Job.

When the paperboard is folded into the shape shown in FIG.
4c and sealed using the device according to the aforementioned Italian patent.

According to the present invention, as shown in FIG. moisturized.

Hereinafter, the paper sealing method according to the present invention will be explained with reference to FIG.

First, as in the case where the folding shown in FIG.
It is sealed tightly. In this case, if time has passed since the action of the knurl roller 4.4° on the paperboard M, an appropriate wetting process, which will be described later, is carried out.

Reference numeral 16 in FIG. 4 indicates a belt or roller conveyor belt. By this conveyor belt 16, the paperboard M
is sent to the separating and folding section 17 in the form shown in FIG.

Reference numeral I8 designates two sprayer heads of a commercially available type, which are suitable for spraying paperboard at a suitable distance.

Edges 14a, +4 of the paperboard in the folded state shown in FIG.
d, 14b and +4c are moistened at a wetting station as shown in FIG.
．． It becomes possible to receive an action of 4°.

After completing this partial sealing stage, the paperboard M has:
As shown in FIGS. 2 and 3, a second bending process is performed.

Before this second folding process, as shown in FIG.
The paperboard M is sent to a second wetting station 19 where the edge 1 of the paperboard M is wetted by the spray nozzles 20 of this station.
3d and +5c are moistened.

The spray nozzle 20 is provided on means movable in a direction transverse to the forward direction of the conveyor belt 16 (in the direction of arrow F in FIG. 4). The paperboard M is then stopped at the second wetting station 19 for the time necessary for the wetting process by the spray nozzle 20.

Immediately after this wetting process, the paperboard M is sent to a holding station (not shown).

Further, on the downstream side of the wetting station I9, a sealing station 2 for sealing by the action of a knurling roller is provided.
1 is provided.

The above description is based on the assumption that a simple self-enveloping envelope is used. By changing the aspects of the sealing process that are obvious to those skilled in the art,
It is obvious that it is also applicable to other self-enveloping envelopes, for example with a double fold, ie a double fold for two intersecting fold lines 11.

As mentioned above, the present invention applies the principles of the first wetting process to the effect of the effective knurling means, i.e. the thickness dimensions and properties of the edges of two sheets of paper that are to be sealed together. Since it is only necessary to provide an interference pressure between two suitable knurl rollers, it is applicable not only to the sealing of cardboard products such as cardboard boxes, but also to the sealing of conventional envelopes.

Thus, the invention is not limited to the embodiments shown and/or described, except that two sides of the paper or cardboard are sealed by a knurling process in conjunction with a first wetting process.

Further, in the paper sealing device of the present invention, a conveying means such as a conveying belt suitable for conveying at least two sheets of paperboard having edges to be joined in the knurling means may be used. Further, as the wetting means, it is possible to suitably use a spray nozzle which is disposed upstream in the direction of movement of the paperboards to be joined and is capable of spraying water only on the edges of the paperboards. The spraying of water by the spray nozzle is preferably carried out within a predetermined time period until the moisture content m of the edge of the paperboard reaches a predetermined value.

In addition, when a self-enveloping envelope paper is used as the paperboard, the wetting means having a nozzle is a standard folding means for folding the paperboard from a tearing means or a cutting means arranged downstream of the printer. It may be arranged downstream of. It is also possible to provide various stations for sealing with a knurling station and a corresponding wetting station located immediately downstream of each folding step of the paperboard. Furthermore, in the present invention, the non-contact surfaces, ie, the outer surfaces, of the two sheets of paper that are in effective contact with each other can be subjected to a wetting treatment, and then the two sheets of paper described below are subjected to the action of the knurl roller. It deforms instantaneously, allowing water to permeate between the sheets, ensuring that the edges of the knurled paper are sealed together.

(Effects of the Invention) As explained above, according to the present invention, for example, an envelope,
In particular, it is possible to ensure the sealing of self-enveloping envelopes that meet all mechanical and natural law requirements.

4 FFI 11i Explanation of Drawings Figures 1 to 3 are schematic development views showing the state of the folding process and sealing process in a self-enveloping envelope, respectively, and Figure 4 is a paper sealing device. FIG.

M...paper (paperboard), 4.4°...knurling roller (knurling means), 16...conveyor belt (transfer means),
19...Wetting station (wetting means).

Claims (1)

[Claims] 1. In a method of sealing two sheets of paper that have been subjected to the action of a knurling means, the water content on the surface of the paper immediately after the action of the knurling means is determined by determining the dry weight of the paper. A method for sealing paper, characterized in that the amount is set within a range of 5 to 98% by weight. 2. The paper sealing method according to claim 1, wherein the water content on the surface of the paper is set within a range of about 9 to 10% by weight. 3. A method for sealing paper according to claim 1, characterized in that paper having a self-enveloping edge is used. 4. The paper according to claim 1, 2, or 3, wherein the water content on the surface of the paper is set within the range by spraying water at least once. Sealing method. 5. The paper sealing method according to claim 1, wherein the surface of the paper is subjected to a wetting treatment immediately before being subjected to the action of the knurling means. 6. An apparatus comprising a knurling means and sealing paper using the paper sealing method according to any one of claims 1 to 5, wherein the knurling is provided on the upstream side of the knurling means. A device for sealing paper, comprising a wetting means for adjusting the moisture content of the surface of the paper to be acted upon by the means. 7. said paper having a self-enveloping edge and comprising transport means for transporting said paper from a folding station to a wetting station and from said folding station to a knurled station; 7. A paper sealing device as claimed in claim 6, characterized in that the stations are arranged to be repeated for each folding step of the paper. 8. The wetting station is provided with a wetting means;
8. A paper sealing device according to claim 6, wherein the wetting means comprises at least one water spraying means.