EP0671337A1 - Envelope or mailing bag and process for producing such envelope - Google Patents

Abstract

The envelope (1) has a tear-off thread (3) in the form of a flat, adhesive-coated degradable strip is located in at least one fold-edge (2) of one side flap, and is stuck to the envelope paper and or to the inner lining of the envelope. In part (4) of at least one end (5) of the thread located inside the envelope, the envelope (1) has a perforation (7) to form a tear-off corner (6) covering the thread's end. The envelope is made from a continuous length of paper (8) of suitable width (9). The side edges (11) are cut by a machine (14). While the length of paper is continuously travelling, the tear-off thread is placed in the direction of travel in one side fold-edge, stuck down by pressure, and conveyed along with the paper.

Description

The invention relates to an envelope or a mailing bag or the like, preferably made of paper with a tear thread lying in a folded edge.

The invention further relates to a process for the production of such envelopes and mailers, e.g. B. made of paper with an inserted tear thread, the tear thread being arranged in the course of production at a fold edge different from a folded edge of a closure flap before the envelope is finished folded.

Envelopes in the form of envelopes of the type described at the outset are already known from DE-G 93 02 248. According to claim 1 of this utility model, the cutting thread is arranged on an edge different from the closure flap and on both ends of the lower edge in the area of Bonding set. Since the cutting thread known according to this utility model acc. Claim 1 of this utility model to be fixed at both ends of the lower edge in the area of the adhesive bond, the cutting thread can only be arranged on the lower edge opposite the closure flap and on no other edge. This thread must be inserted piece by piece during production and it is not clear how such a thread should be inserted during production. It would be conceivable to place such a thread on the type of insertion of a weft thread in a weaving machine. However, the way in which such a thread is introduced is in the utility model mentioned not explained. The insertion in the manner of a weft thread would make the manufacturing machine very slow. This would be uneconomical. Manual insertion is out of the question.

According to claim 2 of this utility model, at least on the one hand the cutting thread is laterally guided out of the envelope and attached to the front or back, for example by gluing. This allows you to easily grasp this thread from the outside and thus cut or tear open the envelope. However, this has the disadvantage that there is a great risk that such an envelope will be torn open during transport because the thread is hanging somewhere, or that the thread will be torn off so that it can no longer be gripped and the envelope will no longer be with it can be torn open. The danger of thread destruction and envelope destruction exists in particular if envelopes stacked on top of one another are pushed back and forth against one another. To fulfill the purpose, however, as can be seen from the full section on page 4 of the utility model documents, the thread must be removed from the envelope. On page 3 of the utility model documents mentioned, it is said in the last complete paragraph that the positioning and fixing of the cutting thread is carried out simultaneously and in the same operation with the gluing of the side flaps, and that in this way a slowdown in the production process can be avoided and the additional equipment expenditure is minimal and is easy to integrate into the existing production. However, it is not clear how the thread insertion and separation should take place and what the devices that mean the "additional device effort" can look like and what they can do. Nor can it be seen in what way the thread can be attached to the existing system and which system is meant by this.

Based on this StdT. the invention is therefore based on the object of proposing an envelope of the type described at the beginning, the tear thread of which is easy to handle, a torn or soiled protrusion of the thread being avoided.

The invention is also intended to propose a method for producing such an envelope.

With regard to the envelope, which is hereinafter referred to only as an envelope, this task is according to the invention. solved in that a tear thread is arranged in at least one lateral folding edge and is in love with the paper of the envelope and / or an inner lining of the envelope without protrusions. A tear thread that is arranged along the side edge, that is to say a side folding edge of the blank and glued there without an overhang, cannot be torn off from the outside. The guiding of the thread along the side edge allows continuous threading and unwinding of the thread with the run of the endless paper tape, so that the thread is easily placed and cut with knives for trimming the side edges and is in love with the folded edge of the still flat cut, so that during the further folding of the blank to the finished envelope not any other special measures. this thread must be taken, but the thread can rather be completely ignored. By tearing off a smaller upper corner on the side edge of the envelope or at any other corner where the thread ends, the thread can be gripped and pulled off in the lateral direction and the envelope can thus be opened. The thread can thus be introduced economically, so that the envelope is economically restored can be. It is no longer possible to tear off protruding thread ends because no thread ends protrude. Accordingly, an envelope cannot be opened unintentionally via the protruding thread end which is glued to the envelope at its free end.

For technical reasons, the thread is arranged in a side folding edge of the blank. This fold edge of a side flap is the fold edge running in the machine direction. Positioning just in this edge allows an endless thread to be inserted in the envelope manufacturing according to the procedure described below.

According to one embodiment of the invention, it is proposed that in the area of at least one end of a thread which is located within the envelope, the envelope has a perforation to form a tear-off corner covering the thread end. This makes it very easy to mark the point at which the thread end with which the tearing process is to begin is located. The perforation is easy to insert and can be inserted during the run with the knife for trimming the side edges. When perforating, however, care must be taken to ensure that the thread end is not perforated or even severed. The perforations must therefore be next to the thread end and must not separate the thread end. Perforation is especially necessary for thick papers to support the tearing process.

In addition, it is then proposed according to the invention that the tear thread is designed as a flat ribbon. As a result, an impermissible thickening of the side edges, which would produce a one-sided stack elevation, avoided. If the tape thickness is 40 µm, for example, the sleeves are later easier to stack.

Another further development provides that the tear thread is provided with adhesive which sticks under pressure and / or heat. In this way, it is possible to dispense with appropriate gluing or gumming of the envelope itself or of the blank before the thread is applied. The adhesive is always where the thread is and there are no positioning problems between an adhesive strip and a thread. It can also no longer occur with this form of gluing that the tear thread, which is only glued to a single point at its end, releases from its movement at the start of the tear-open process, so that it can simply be pulled out and an opening by means of this Thread is no longer possible. Here, for example, so-called hot-melt strips are to be mentioned, which love through the supply of heat or self-adhesive strips, which stick to the paper web by pressing.

Finally, it is proposed that the thread consist of a material that is easily decomposed. Such materials are already known today. In particular, high-strength decomposable nonwovens from which such a thread could be cut are already known. Such a thread could then be separated during recycling of the envelope and fed to a separate rotting process. He could also if necessary. rot together with the envelope. If the thread is made from a polyprorylene material, the thread can be skimmed off with the foil windows when recycling the envelope.

With regard to the method mentioned at the outset. The object underlying the invention is achieved in that at least one tear thread is continuously placed in the area of a lateral folding edge extending in the direction of travel of the paper web while a continuous machine of suitable width is being passed through a processing machine prior to trimming the side edges to produce a blank prepared for the final folding is pressed on and thereby glued and transported along with the paper web, with the format side cut-out subsequently separating the resulting excess in the longitudinal direction. Machines with those from a paper tape that is quickly and continuously transported through the machine. have already been printed in the desired manner in the machine, a flat blank can be cut for the production of envelopes, are already known. Their structure and mode of operation therefore need not be described here. On the continuous paper web, which is not yet separated in the transverse direction and is not yet trimmed at the side edges, is at a suitable point, for. B. on a deflecting roller, laterally a later extending edge in the direction of the running paper web, the tear thread is continuously placed and pressed by means of a roller or roller and thus continuously in love with the paper web and continuously transported. The laying on and falling in love and the transport can take place without any impairment of the normal transport speed of the paper web. The general work of the known machine is in no way disturbed. During the transport of the paper web through the machine and after the tear thread is placed in the manner mentioned, the shape of the side edges is trimmed z. B. by means of a rotary knife, which is also known per se and therefore does not require any further description in its function and shape. The Rotary knives now not only cut away excess paper parts in the area of the trimming of the side edges, but also the excess of the tear thread, so that the tear thread of each envelope is cut to its correct length at the same time. When the blank is subsequently folded into the finished envelope, the thread placed on it no longer has to be observed. When the envelope is folded out of the blank, the thread is in the right place. In order to be able to quickly and easily grasp the tear thread later, it makes sense to perforate a paper area at least at one end of a tear thread to form a tear-off corner. In a further embodiment of the invention, this can be carried out together with the format cutout of the side edges.

Finally, with regard to the design of the method, it is also proposed that after folding in the side flaps comprising the tear-open thread, the folded edge is rolled over under pressure. As a result, the adhesive of the tear thread is secured again and the subsequent tearing easier.

The invention will now be explained in more detail with reference to the accompanying drawings, which only show a schematic structure and sequence.

Fig. 1

ununterbrochene Papierbahn mit eingezeichneten Konturen des Zuschnitts in Draufsicht

Fig. 2

schematisch einen Ausschnitt einer Maschine zum Herstellen von Briefumschlägen mit zugeordneter Fadenspuleinrichtung und Führungs- und Anpresseinrichtung

Fig. 3

Messerrolle für die Beschneidung der Seitenränder

Fig. 4

abgewickelte Schneide der Messerrolle

Fig. 2 zeigt den schematischen Aufbau eines Ausschnitts 15 einer Maschine 14 zur Herstellung von Briefbögen, der ein Teil einer Gesamtanlage ist. Eine ununterbrochene Papierbahn 8, wie sie auch in Fig. 1 dargestellt ist, durchläuft, wie Fig. 2 erkennen läßt, diesen Ausschnitt 15, der zwischen der Fensterstation 10 und der Station für den Formatseitenausschnitt 26 liegt in Richtung des Pfeils 20. Die Anordnung direkt vor dem Formatseitenausschnitt hat den Vorteil, daß die mit dem Band beklebte Papierbahn vor dem Schneiden des Fadens nicht verschiedenen Krümmungen unterliegt, die ein Ablösen des Fadens forcieren könnten. Dem Ausschnitt 15 zugeordnet ist eine Fadenspuleinrichtung 16 und eine Führungs- und Anpresseinrichtung 19.Show it:

Fig. 1

uninterrupted paper web with drawn contours of the blank in top view

Fig. 2

schematically shows a section of a machine for producing envelopes with an associated thread winding device and a guiding and pressing device

Fig. 3

Knife roll for trimming the side edges

Fig. 4

developed edge of the knife roll

Fig. 2 shows the schematic structure of a section 15 of a machine 14 for the production of letterhead, which is part of an overall system. An uninterrupted paper web 8, as also shown in FIG. 1, passes through this cutout 15, as can be seen in FIG. 2, which lies between the window station 10 and the station for the format side cutout 26 in the direction of the arrow 20. The arrangement is direct Before the format side cutout has the advantage that the paper web glued to the tape is not subject to different curvatures before cutting the thread, which could force the thread to come off. A thread winding device 16 and a guiding and pressing device 19 are assigned to the cutout 15.

The thread spool device 16 carries a thread spool 18 and this is followed by a dispenser 17, with which the thread tension of the tear thread 3 can also be regulated.

During operation, the tear thread 3 is removed from the thread spool 18 of the thread spool device 16 by the unwinding device 17 regulating the thread tension unwound through and led to the guide and pressing device 19. The thread 3 is guided into the correct lateral position and then, if necessary, guided to the paper web 8 in the area in front of the station for the format side cutout 26 via further guide rollers and placed there on the paper web and pressed onto the paper web via the pressure roller 22. Since the tear thread 3 itself has the necessary adhesive, it is thereby glued to the paper web, which transports it back in the direction of the arrow 20 during operation, thereby forcing the same speed as the paper web 8 itself. The pressure roller 22 can be used to generate the required contact pressure z. B. be spring loaded. The lateral orientation of the tear thread 3 is such that it is placed along a folding edge 2 (FIG. 1) which extends in the direction of the arrow 20 and moves in this direction. Immediately after this process, the side edge 11 is cut on both sides of the paper web 8 using a rotating knife 25, as shown in FIG. 3, in a format cutting station 26. This creates the necessary side contour of an envelope to be folded later from such a blank. A separating cut along the separating edge 21 for separating a blank from other blanks takes place later. With the aid of the knife contour 24 of the rotary knife shown in FIG. 3, which is shown again in development in FIG. 4 and can also be seen in development in FIG. 1, an unnecessary edge region, which is shown hatched in FIG. 1, now becomes cut off. Here, the tear thread 3 is cut through in this area, which becomes waste with the hatched paper area. This cutting process forms side flaps 13, which are later folded inwards along the folding edge 2 when the envelope 1 is folded, so that after this folding inwards the tear thread 3 is covered by the paper of the blank. It ends exactly at the edges of the cut and does not protrude anywhere.

In addition to the knife contour 24, a perforation knife 25 is provided, with which the perforation 7 is introduced during the cut in such a way that the tear thread 3 is not damaged thereby. This perforated area 4 at the end of the thread 5 then forms a tear-off corner after the folding of the envelope 1, which can be easily recognized and torn off, so that the corresponding end 5 of the thread 3 is held in hands and then the corresponding folded edge of the envelope can be torn open. The entire width 9 of the paper web 8 is thus only reached by the side flaps 13 and is narrower at the side edges 11 which are cut by the knife contour 24, with a closure flap after the separating edge 21 opposite the transport direction of the arrow 20 23 of the next blank. However, the cutting of such an envelope 1 and its production are known per se and therefore do not require any further explanation here either.

It can also be seen that the normal production process for the production of such envelopes, as is known, is not disrupted by the application of the tear thread 3 in the manner described here. There are no changes in the production process. All that is required to carry out the method is the known sequence of the method and additionally the thread placement described. As a machine 14 for carrying out the method, it is sufficient to supplement any known machine that is used in the production of such envelopes so that on an accessible support roller for the fast-moving paper web 8, a thread extends in the correct lateral orientation and in the transport direction placed on the paper web and glued by pressing with the pressure roller 22. To do this, the thread that is assigned by an Thread winding device is provided, are guided in the correct lateral direction, because yes, the thread 3 to be provided on the thread spool 18 is not only wound one above the other but also side by side, so that this thread runs back and forth continuously when unwinding. However, it is also possible not to use a thread guide roller for thread guidance, but other suitable means such as, for example, a thread inlet funnel with an outlet nozzle in the correct lateral position for the thread. If the thread spool is not too wide and instead has a larger diameter, a simple eyelet is sufficient as a thread guide, through which the thread runs.

The sizing of the thread itself in such a way that the adhesive properties only become effective again under pressure and / or with the addition of heat, makes it superfluous to provide glue feeds on any gluing devices which have to be aligned and furthermore no glue scrapers have to be provided, so that the processing is extraordinary can be done cleanly.

List of the reference symbols used

1

Envelope

2nd

Folded edge

3rd

Tear thread

4th

Area

5

End of thread

6

Tear-off corner

7

perforation

8th

Paper web

9

Paper web width

10th

Window station

11

Side edges

12th

Got over

13

Side tab

14

machine

15

Neckline

16

Thread winding device

17th

Dispenser

18th

Thread spool

19th

Guiding and pressing device

20th

arrow

21

Separating edge

22

Pressure roller

23

Locking tab

24th

Knife contour

25th

Perforation knife

26

Station for the format page cutout

Claims (9)

Envelope (1) or mail bag or similar With a tear thread (3) lying in a fold edge (2), characterized in that a tear thread (3) is arranged in at least one fold edge (2) of a side flap and glued to the paper of the envelope and / or an inner lining of the envelope without protrusions is. Envelope according to claim 1, characterized in that in the area (4) of at least one end (5) of a thread (3) which is located within the envelope (1), the envelope (1) to form an end covering the thread end (5) Tear-off corner (6) has a perforation (7). Cover according to one of claims 1 and 2, characterized in that the tear thread (3) is designed as a flat ribbon. Cover according to one of claims 1 to 3, characterized in that the tear thread (3) is provided with adhesive which sticks under pressure and / or supply of heat. Cover according to one of claims 1 to 4, characterized in that the thread (3) consists of an easily rotten material. Method for producing an envelope (1) or a mailing bag or the like with inserted tear thread (3), the tear thread (3) being arranged in the course of production on a fold edge different from a folded edge of a closure flap before the envelope is completely folded, characterized in that more suitable during the passage of an uninterrupted paper web (8) Width (9) through a processing machine (14) before trimming the side edges (11) to produce a blank prepared for the final folding, at least one tear thread (3) continuously placed in the area of a lateral folding edge (2) extending in the running direction of the paper web, pressed on and thereby loved and transported along with the paper web (8), with the format side cut-out subsequently being used to cut off the protrusion which arises in the longitudinal direction. Method according to claim 6, characterized in that a paper area (4) is perforated to form a tear-off corner (6) on at least one end (5) of a tear thread (3). Method according to claim 7, characterized in that the perforation (7) is carried out together with the format cutout of the side edges (11). Method according to one of claims 6 to 8, characterized in that after folding in the side flaps (13) comprising the tear-open thread (3), the folded edge (2) is rolled over under pressure.

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