EP2627594A1

EP2627594A1 - Device and method for transversely folding a web section and hygienic tissue

Info

Publication number: EP2627594A1
Application number: EP11781743.7A
Authority: EP
Inventors: Marc Schnell; Reiner Seger
Original assignee: Winkler and Duennebier GmbH
Current assignee: Winkler and Duennebier GmbH
Priority date: 2010-10-15
Filing date: 2011-10-17
Publication date: 2013-08-21
Anticipated expiration: 2031-10-17
Also published as: DE102011116003B4; CN103282295B; DE102011116003A1; EP2627594B1; CN103282295A; WO2012048904A1

Abstract

By means of a device (2) for transversely folding a web section (70), a web section, in particular a handkerchief, is to be folded to 1/3 of an edge length thereof. This is achieved by using a device (2) having a central folding cylinder (8) and a first and a second pre-crease folding cylinder (14, 20), wherein the respective axes of rotation of the folding cylinders (8, 14, 20) are oriented parallel to each other, wherein the direction of rotation of the central folding cylinder (8) is opposite to the direction of rotation of the first and second pre-crease folding cylinders (14, 20), wherein the folding cylinders (8, 14, 20) each have controllable suction orifices for applying suction to the web section (70). The device has a plurality of ironing shafts, wherein the central folding cylinder (8) has a first suction orifice (82) for transporting the web section (70) to the first pre-crease folding cylinder (14), and wherein the central folding cylinder (8) is provided with a third suction orifice (94) and the first pre-crease folding cylinder (14) is provided with a second suction orifice (88), the suction action of which on the web section (70) creates a 1/3 fold (140) at the front end (76) of said section, and wherein the second pre-crease folding cylinder (20) has a sixth suction orifice (100), the suction action of which on the web section (70) produces a fold in the web section (70), wherein the web section (70) is firmly held on the central folding cylinder (8) by a fourth and a fifth suction orifice (112, 118) in said cylinder. The invention further relates to a corresponding method and to a hygienic tissue.

Description

description

Device and method for the transverse folding of a web section

and hygiene towel

The invention relates to a device and a method for the transverse folding of a web section. It also relates to a sanitary towel.

Hygienic towels in the form of handkerchiefs have long been known. They are folded from a tissue blank consisting of tissue paper with the standard dimensions of about 210 mm x 210 mm and packed in stacks of five to ten folded paper tissues in an optionally resealable packaging wrapper.

The type of folding of the sanitary towels is of greater importance, since it depends on the format and the thickness of the 5-1 Oer stack packed wipes. There are various folding options, the best known are the so-called Z-folding and the folding in pocket or pocket format.

Folded paper handkerchiefs of this type often have a rectangular shape shown in DE 25 12 140 A1 with an aspect ratio of the long to short rectangle side of 2: 1. This rectangular shape is achieved by folding the square fabric blank around two longitudinal fold lines, the so-called Z-fold, and then folding it around three transverse fold lines. The folded in this way tissue paper has a thickness of eight folds.

There is a need to optimize the format, in particular the thickness of the packet, in the usual handkerchief or pocket format and to keep it as low as possible. As a result, on the one hand packaging material can be saved and on the other hand the stowage of the packet can be improved.

CONFIRMATION COPY It is therefore an object of the present invention to provide a device with a folded towelette, especially handkerchief while maintaining the previous surface of the unfolded cloth blank has a smaller thickness than known sanitary towels. Furthermore, an associated method for producing a folded sanitary towel is provided which, when folded into a tissue or pocket format while maintaining the previous surface of the unfolded blank fabric has a smaller thickness than known sanitary towels. Furthermore, a handkerchief is provided.

With respect to the device, this object is achieved according to the invention by the features of claim 1. With respect to the method, this object is achieved by the features of claim 2. With respect to the towel, we achieved the above object according to the invention by the features of Claims 3 and 4. Advantageous embodiments of the invention are the subject of the dependent claims and the description of the embodiments.

This object is achieved with a device for transverse folding of web sections of paper, tissue or similar materials, in particular hygienic towels, with a central folding cylinder and a first and a second Vorbruchfalzzylinder, wherein the axes of rotation of the folding cylinder are aligned parallel to each other, wherein the direction of rotation the central folding cylinder is opposite to the direction of rotation of the first and second Vorbruchfalzzylinders, wherein the folding cylinders each have controllable suction holes for sucking the web portion and having a plurality of bow shafts, wherein the central folding cylinder of a first suction bore for transporting the web portion to the first Vorbruchfalzzylinder, and wherein in the central folding cylinder, a third suction hole and in the first Vorbruchfalzzylinder a second suction hole are provided by the suction of the web portion at its front end a 1/3 convolution, and wherein the second Vorbruchfalzzylinder a sixth suction hole, by the suction of the web portion preferably a 1/6 fold in the web section is generated, wherein the web section is held by a fourth and a fifth suction hole in the central folding cylinder at this. The invention is based on the consideration that the folded format and the thickness of a sanitary towel depends on the type of folding. A smaller format and a smaller thickness can be achieved by a different type of folding of the sanitary towel. A particularly favorable combination is achievable by folding a handkerchief into three almost equal section lengths with respect to an edge length. A 210 x 210 mm handkerchief can be folded in this way to a format of 70 x 70 mm. But also folds in the approx. 104 x 54 mm (standard format) or the approx. 76 x 54 mm pocket format can be achieved with this type of folding.

In the apparatus, unfolded blank fabrics are fed via a centrally arranged folding cylinder to a first and a second Vorbruchfalzzylinder. The axes of rotation of the folding cylinders are each aligned in parallel. The direction of rotation of the central folding cylinder is opposite to the direction of rotation of the two Vorbruchfalzzylinder. The folding cylinders have controllable suction bores with which the web sections of the cloth blanks are transported further from cylinder to cylinder. There are provided a plurality of bow shafts, which advantageously support the folding of the tissue sheets.

Due to the particularly advantageous design device, the web sections are folded transversely to 1/3 of an edge length.

In particular, the fast rotation of the folding cylinders causes large centrifugal forces, which may cause, among other things, a detachment of the web portion preferably at its front end of the central folding cylinder. Especially the suction of the web section at the central folding cylinder after passing through the second pre-folding cylinder is critical and therefore requires a special device. In order to avoid a detachment on the one hand and on the other to ensure a secure guidance of the web section on the central folding cylinder, two suction bores, which are referred to as fourth and fifth and are arranged one behind the other in the direction of rotation of the central folding cylinder, are therefore advantageously provided. Ideally, these are in combination with the suction device on the second Vorbruchfalzzylinder so ordered that both the web section is securely held on the central folding cylinder and the desired folding is achieved.

In a preferred embodiment causes the fourth suction hole in an intermediate step after completion of the suction on the second Vorbruchfalzzylinder and supported by a bow shaft that the web section receives another, only auxiliary existing fold. This is located inside the railway section directly behind the front of the railway section. By generating this auxiliary fold near the front, a better suction, in particular of the front part of the web section is made possible. The fourth suction hole is used only for a short time, so that after the end of the use of the fourth suction hole, the auxiliary fold dissolves again and the remaining suction holes can ensure safe onward transport. After completion of the suction through the fourth suction hole, the front of the paper fold is shifted to the fifth suction hole, which corresponds approximately to the desired fold.

Ideally, the fourth and fifth suction holes are arranged so that at any time the paper fold is held by one of the two suction holes. The maximum distance between the fourth and fifth suction holes should therefore correspond to the Papierfalzlänge.

Furthermore, the object is achieved according to the invention with a method for transverse folding of web sections of paper, tissue or similar materials, in particular sanitary towels, with a central folding cylinder and a first and a second Vorbruchfalzzylinder, the axes of rotation of the folding cylinders are aligned parallel to each other, wherein the The direction of rotation of the central folding cylinder is opposite to the direction of rotation of the first and second Vorbruchfalzzylinders, the folding cylinders each having controllable suction holes for sucking the web portion, and having a plurality of bow shafts, said web portion by means of a first suction bore on the central folding cylinder to the first Vorbruchfalzzylinder is transported, and wherein provided with a provided in the central folding cylinder third suction hole and provided in the first Vorbruchfalzzylinder second suction hole through the respective suction of the web section at its front end a 1/3 fold is performed, and where by a suction a 1/6 fold in the web section is produced with the aid of a sixth suction hole in the second pre-folding cylinder and the web section is held thereby by a fourth and a fifth suction bore in the central folding cylinder.

By means of this method according to the invention and also by the device, unfolded cloth blanks are preferably folded around two longitudinal fold lines and two or three transverse fold lines. The unfolded blank fabric preferably has a square shape. The cloth blank is transported via the central folding cylinder to the first pre-folding cylinder. To guide the separately controllable suction ports are used for this purpose.

In per se conventional design, the web section can be folded by a longitudinal fold in the longitudinal direction.

Commonly used sanitary napkins have a square shape in which first and second edge lengths, i. Long side and transverse side, the same length. In order to particularly optimize the thickness and format of a folded towelette, in a sanitary napkin, especially handkerchief, the second edge length, i. the length of the longitudinal side is three-quarters as long as the first edge length, i. the transverse side.

Despite the shorter longitudinal side, the handkerchief can be folded in the same format as well as the actually known handkerchief formats. Due to the shortened side material is saved considerably. Also, the thickness of the folded handkerchief is less, so that is saved in a stack of 5 or 10 sanitary towels to a packet of packaging material.

An embodiment of the invention will be explained in more detail with reference to a drawing. In a schematic representation:

1 shows a device for the transverse folding of a web section with a central folding cylinder, a first and a second Vorbruchfalzzylinder and a first and second bow shaft in a preparation step, FIG. 2 shows the device of FIG. 1 in a first folding step, FIG.

3 shows the device from FIG. 1 in a first intermediate step, FIG.

4 shows the device from FIG. 1 in a second intermediate step, FIG.

5 shows the device from FIG. 1 in a second folding step, FIG.

6 shows the device with additionally shown suction holes,

7 shows a handkerchief according to the prior art and a handkerchief according to the invention with two and three transverse folds and two longitudinal folds,

8 shows a handkerchief according to the prior art and an inventive handkerchief with two or three transverse folds and a longitudinal fold, and

9 shows a handkerchief according to the prior art and a handkerchief according to the invention with two or three transverse folds and two longitudinal folds.

Identical parts are provided in all figures with the same reference numerals.

The device 2 for the transverse folding of a web section according to FIG. 1 has a central folding cylinder 8. Adjacent thereto are a first pre-preg-folding cylinder 14 and a second prebreak-folding cylinder 20. A first ironing shaft 26 is disposed between the first preg-folding cylinder 14 and the second prebreak-folding cylinder 20. The first pre-preg-folding cylinder 14 is also referred to as 1/3 pre-preg-folding cylinder, the second pre-preg-folding cylinder 20 is referred to as 1/6 pre-preg-folding cylinder. A second stirrup shaft 32 is arranged in the direction of rotation 38 of the central folding cylinder 8 behind the second Vorbruchfalzzylinder 20. The direction of rotation 38 of the central folding cylinder 8 corresponds in the clockwise direction, while the directions of rotation 38 of the two Vorbruchfalzzylinder 14, 20 run counterclockwise. The axes of rotation of the folding cylinders 8, 14, 20 are aligned parallel to each other. The three folding cylinders show each because a coat 40, 46, 52 on. The facing lateral surfaces of the central folding cylinder 8 and the first Vorbruchfalzzylinders 14, and the lateral surfaces of the central folding cylinder 8 and the second Vorbruchfalzzylinders 20 each define a passage gap 58 for the web section. Furthermore, a knife shaft 64 rotating in the counterclockwise direction is drawn, from which the web section 70 to be processed, in the present exemplary embodiment a handkerchief, is guided onto the central folding cylinder 8.

For guiding the web section 70 during the folding process, separately controllable suction bores are respectively used in the three folding cylinders 8, 14, 20, the position and mode of operation of which will be explained in more detail below.

The front end 76 of the web section is taken over by the knife shaft 64 with the first suction bore 82 onto the first folding cylinder 8 in the method step illustrated in FIG. 1. For this purpose, the front end 76 is just so firmly sucked on a first suction bore 82 that a secure transport on the first folding cylinder 8 is made possible without the web section 70 unintentionally becoming detached. After a predetermined angle of rotation d1, the front end 76 is released with the first suction bore 82 and taken over by the first Vorbruchfalzzylinder with a second suction hole 88. The web section 70 continues to be held by a third suction hole 94 at the second third of the web section 70 viewed from the front end 76. After a predetermined angle of rotation d2 of the central folding cylinder 8, the front end 76 is released from the second suction hole 88.

In Fig. 2, the device 2 is shown during a first folding step, which is usually referred to as 1/3 folding. The suction effect of the first suction bore 82 has been stopped or switched off, ie, the first suction bore 82 is no longer in action. The third suction hole 94 holds the web portion 70 and the handkerchief so firmly that about 1/3 of the imaginary finished folded handkerchief rests backwards on the remaining handkerchief of about 2/3 length, creating a 1/3 fold 140 is formed. The handkerchief prepared in this way is now in the direction of rotation 38 of the first folding cylinder 8 in the direction of the second Vorbruchfalzzylinders 20 transports.

3 shows the device 2 in a first intermediate step. The third suction hole 94 of the central folding cylinder 8 has released from the handkerchief. A sixth suction bore 100 of the second Vorbruchfalzzylinders 20 has now taken over the web portion 70 in the amount of a first fold 106 and sucks him. In the central folding cylinder 8, a fourth suction bore 112 and a fifth suction bore 116 are still provided, the web section 70 continue to hold on the central folding cylinder 8 in the process step shown. The sixth suction bore 100 now lets go of the web section 70, after which the leading edge 124 is now held by the fourth suction bore 112. In this way, a Hilfsf altkante, which prepares the approximate 1/3 fold in a later step by releasing the track section 70 through the fourth suction hole 112.

In a second intermediate step, illustrated in FIG. 4, in which the central folding cylinder 8 has rotated further in a clockwise direction than the first intermediate step, it can be seen that the 1/6 fold at this point in time is not exactly at the leading edge. 3 away from the actual cloth start is positioned. Rather, a small part of the actual cloth start is still held by the fourth suction hole 112. It creates in this way a kink, which is required to initiate the next fold, the so-called 1/6 fold, and favors the holding of the cloth beginning at the central folding cylinder 8. The temporary holding of the cloth beginning by the fourth suction bore 112 favors in particular a better distribution of the forces acting, so that the transfer of the cloth and thus the overall process runs more stable. After the operation of the fourth suction hole 112 is set, the cloth beginning of the fifth suction hole 118 is held. Without the stepped use of the fourth 112 and also the fifth suction hole 118, the cloth beginning could detach from the central folding cylinder 8 and the illustrated folding process would then not be able to be carried out.

In a second folding step shown in FIG. 5, the fourth suction bore 112 has released the web section 70. The leading edge 124 jumps to the fifth suction back hole and the inner leg of the cloth start rolling back in the kink of 1/6 fold. The handkerchief so folded in this manner is transferred to a dispensing cylinder 142 in a conventional manner under a guide 130. For this purpose, the tissue is taken over by a seventh suction bore 148 of the discharge cylinder 142 and released from the fifth suction bore 118. The tissue is then placed on a conveyor belt 154.

In Fig. 6 further suction holes, namely an eighth suction hole 160 and a ninth suction hole 168 of the central folding cylinder 8 are located. The eighth suction bore 160 assists the fifth suction bore 118 in holding the tissue after the fourth suction bore 112 has released it so that it does not open. The ninth suction bore 168 has a supporting effect on the region 174 of the pocket tissue so that it does not open or does not detach from the fifth suction bore 118. The area circled in FIG. 6 is shown next to it somewhat larger.

The longitudinal folding of the web section 70 is advantageously carried out in the usual way in a longitudinal fold or longitudinal seam aggregate arranged in front of a cutting and folding unit.

In Fig. 7, a handkerchief 200 according to the prior art with two longitudinal folds 218 and two transverse folds 212 is shown. The tissue 200 has a square shape and 210 x 210 mm, for example. The edge length 230 of the handkerchief 200 thus corresponds to the edge length 232. The handkerchief 200 is in the upper region of FIG. 7 with two folds, in the central region of FIG. 7 in the unfolded state, and in the lower region of the figure in the folded state in plan view shown. To clarify the position and position of the individual sections of the handkerchief, the edge 224 is drawn in each case filled. The tissue 200 with the provided folds 212, 218 in the folded state has the standard Z-format. The tissue 200 has two Längsfalze 218 and three Querfalze 212. The longitudinal folds 218 extend at right angles to the transverse folds 212. In the collapsed folded state, this sanitary towel is eight fold layers thick. In contrast, an inventive handkerchief 206 shown in FIG. 7, which can be produced with the aid of the method described above, has exactly two transverse folds 212 and two longitudinal folds 218. Again, the Längsfalze 218 perpendicular to the transverse folds 212. The edge length 230 is also here 210 mm. The edge length 232 corresponds to only about% of the edge length 230. The edge length 232 is thus reduced in the longitudinal direction to 3/4 of the edge length 232 of the known handkerchief. The handkerchief 206 is replaced by a rectangular shape when unfolded. The handkerchief 206 can now also be folded in the manner of a Z-fold. When folded, it has the same format as the handkerchief 200, but is only ³ λ SO thick. This handkerchief is only six fold layers thick.

In FIG. 8, similar to FIG. 7, a conventional handkerchief 200 and a handkerchief 206 according to the invention are shown. Both handkerchiefs 200, 206 are shown in the lower part of the figure in the so-called book or V-fold. The handkerchief 200 has a longitudinal fold 218 and three transverse folds 212. The tissue 206 has two transverse folds 212 and a longitudinal fold 218. In both handkerchiefs, the longitudinal folds 218 extend at right angles to the transverse folds 212. The format of the folded handkerchief 206 agrees with that of the handkerchief 200. However, also in this folding, the tissue 200 is eight fold layers thick, whereas the handkerchief 206 has only six fold layers.

The handkerchiefs 200 (prior art) and 206 shown in FIG. 9 each have two longitudinal folds 218, respectively. The handkerchief 206 according to the invention has two, the known handkerchief 200 three Querfalze on. Again, the longitudinal folds 218 are perpendicular to the transverse folds 212. Both handkerchiefs are shown in the lower part of the figure in a compact pocket format or mini format. Similar to the embodiments of the handkerchief 206 according to FIGS. 7 and 8, both handkerchiefs in the folded state have the same format. The edge length 232 of the handkerchief 206 again corresponds to% of the edge length 230. The handkerchief 200 has twelve folded layers in the folded state. The handkerchief 206 is only nine fold layers thick. The Ta shown in FIGS. 7, 8, 9 Shawls are advantageously folded by the method set forth above and thus stacked into packets for packaging.

List of Reference Devices

central folding cylinder

first Vorbruchfalzzylinder

second Vorbruchfalzzylinder

first bow shaft

second bow shaft,

direction of rotation

coat

Passage gap

cutterhead

web section

front end

first suction hole

second suction hole

third suction hole

sixth suction hole

first folding point

fourth suction hole

fifth suction hole

leading edge

guide

1/6 fold

1/3 folding

discharge cylinder

conveyor belt

eighth suction hole

ninth suction hole

Area

Handkerchief

Handkerchief 212 transverse fold

218 longitudinal fold

224 edge

230 edge length

232 edge length

236 longitudinal direction d1 rotation angle d2 rotation angle

Claims

claims

Device (2) for the transverse folding of web sections (70) of paper, tissue or similar materials, in particular sanitary towels, with a central folding cylinder (8) and a first and a second Vorbruchfalzzylinder (14,20), wherein the axes of rotation of the folding cylinder (8 , 14, 20) are each aligned parallel to each other, wherein the direction of rotation of the central folding cylinder (8) is opposite to the direction of rotation of the first and second Vorbruchfalzzylinders (14,20), wherein the folding cylinders (8,14,20) each controllable suction holes for suction said central folding cylinder (8) has a first suction bore (82) for transporting the web section (70) to the first deburring folding cylinder (14), and wherein in the central folding cylinder (8 ) a third suction bore (94) and in the first Vorbruchfalzzylinder (14) a second suction bore (88) are provided by the suction of the web portion (70) to be At the front end (76) a 1/3 fold (140) is formed, and wherein the second Vorbruchfalzzylinder (20) has a sixth suction hole (100), by the suction of the web portion (70) a fold in the web section (70) is generated in which the web section (70) is held by a fourth and a fifth suction bore (112, 118) in the central folding cylinder (8).

Apparatus according to claim 1, characterized in that the fourth suction bore (112) and the fifth suction bore (118) in the central folding cylinder (8) and the suction bore (100) in the second Vorbruchfalzzylinder (20) are arranged to each other such that during operation of the fourth suction bore (112) on the central folding cylinder (8), the leading edge (124) of the web portion (70) is held by this, and that upon operation of the fifth suction bore (118) on the central folding cylinder and after completion of the suction operation of the fourth suction bore (112), the leading edge (124) of the web section (70) is held by the fifth suction bore (124).

Apparatus according to claim 2, characterized in that the fourth suction bore (112) and the fifth suction bore (118) in the central folding cylinder (8) and the Suction bore (100) in the second Vorbruchfalzzylinder (20) are arranged to each other such that the leading edge (124) of the web section (70) from the fourth suction hole (112) in the central folding cylinder (8) is held so that adjacent to the leading edge (124) a further fold is formed, which dissolves upon release of the web section (70) from the fourth suction bore (112), and the leading edge (124) is then located on the fifth suction bore (118).

4. Device according to one of claims 1, 2 or 3, characterized in that the distance between the fourth (112) and fifth suction bore (118) is less than the length of the web section (70).

5. A method of transversely folding web portions (70) of paper, tissue or similar materials, in particular sanitary towels, with a central folding cylinder (8) and a first and a second Vorbruchfalzzylinder (14,20), wherein the axes of rotation of the folding cylinders (8, 14, 20) are each aligned parallel to one another, wherein the direction of rotation of the central folding cylinder (8) is opposite to the direction of rotation of the first and second Vorbruchfalzzylinders (14,20), wherein the folding cylinders (8,14,20) each controllable suction holes for suction the web portion (70) and having a plurality of bow shafts, wherein the web portion (70) by means of a first suction bore (82) on the central folding cylinder (8) to the first Vorbruchfalzzylinder (14) is transported, and wherein with a in central folding cylinder (8) provided third suction bore (94) and provided in the first Vorbruchfalzzylinder (14) second suction bore (88) through the respective An suction of the web portion (70) at its front end (76) a 1/3 fold (140) is performed, and wherein by sucking the web portion (70) by means of a sixth suction hole (100) in the second Vorbruchfalzzylinder (20) a Fold in the web section (70) is generated, and wherein the web section (70) thereby by a fourth and a fifth suction bore (112,118) in the central folding cylinder (8) is held thereon.

6. The method of claim 5, wherein the web portion is folded by a longitudinal fold in the longitudinal direction.

7. web section (70), in particular hygienic towel or handkerchief, characterized in that it is folded according to the method of any one of claims 1 to 6.

8. sanitary towel, in particular handkerchief (206), having a first rectangular shape and a first (230) and a second (232) edge length, characterized in that the second edge length is three-quarters as long as the first edge length.

9. Sanitary towel according to claim 7 with two parallel to the second edge length transverse folds (212).

10. Sanitary towel according to claim 8 with one, two or three parallel to the first edge length Längsfalzen (218).