CN1003575B - Device for wrinkling paper web - Google Patents

Abstract

The device consists of two intermeshing creping rollers. In order to avoid damaging the creping roller when the adhesive part repairing the crack on the web passes through the creping roller, and also to avoid stopping the work of the device for cutting off the adhesive part, the creping roller and the two corrugating rollers have the same The drive wheels are associated with feed rollers that engage both sides of the web to feed it. When the detection device detects a sticky part on the web, before it passes, the first servo motor disengages the upper creping roller from the engagement with the lower creping roller, and immediately after it passes, the second servo motor makes the The upper and lower creping rollers return to the meshing state. With the aid of an adjustable stop surface, the depth of engagement of the creping rollers, ie the creping depth, can be determined precisely as before.

Description

Device for wrinkling paper web

The invention relates to a device for creping paper webs, comprising at least two creping rolls which are in engagement with one another and between which the paper web is fed for processing, and to the use of such a device.

It is known that in the production of cigarette filters, the creping process used is to crepe the web using a grooved roll. The web used is long and wound on large storage reels. Up to now, during the production or rolling of these webs, it has not been possible to avoid frequent tearing of the webs. Thus, they have to be adhered together at the tear using adhesive tape. In any case, the portion of the web to be creped is extremely harmful. This is because the creping rolls are very precise and quenched, so they are very expensive and the corresponding thin tooth spaces and teeth used intermesh with very little play. They are very sensitive to the aforementioned adhesive parts and therefore the creping roll begins to be damaged. When the adhesive portion passes between the creping rollers, the creping rollers can be rendered very weak. To avoid this, it has hitherto been customary to provide the adhesive portion of the storage roll with markings designed to be directed outwardly from the side. When the marked web is creped, the creping device and the web are stopped before the marked adhesive portion passes through the creping device and the adhesive portion is cut off, while the creping roller is removed using a fine adjustment device, the web with the adhesive portion cut off is reinserted between the separate creping rollers, and the creping rollers are then returned to their original interengagement using the fine adjustment device. The creping device is then accelerated to the desired speed and the gap between the creping rolls is readjusted by the fine adjustment device until the desired degree of creping is achieved.

However, the complex methods described above greatly limit the maximum creping speed.

The object of the present invention is therefore to produce a device in which the above-mentioned disadvantages are avoided, i.e. a creping device in which the adhesive portion passes through without stopping the machine.

To this end, according to the invention, in the case of a device of the type mentioned initially, the creasing rollers are associated with at least two feed rollers coupled to a drive and adapted to engage opposite faces of the web, the creasing rollers being mutually rapidly adjustable between an unengaged position and an adjustable stop surface limiting their depth of engagement with each other, at least one of the two creasing rollers being coupled to a rapid adjustment device, the rapid adjustment device being operated in synchronism with the web feed speed, the synchronous operation being performed by detection means mounted in front of the input side of the creasing rollers, the detection means being adapted to detect portions of the web which are not creased and are to be cut out, so that the creasing rollers are already in unengaged condition before the portions to be cut out pass, after the portions to be cut out have passed, the creping rolls are returned to their original operating position.

When the crumpling roller is engaged, it is not necessarily required that the conveying roller is also in the conveying position. Conveniently, therefore, the feed rollers are mutually rapidly adjustable between an inoperative position and a delivery position in which the feed rollers are in engagement with the web to be fed, at least one of the two feed rollers being coupled to the rapid adjustment device, and the creasing roller and the feed rollers being adjustable in this position so as to bring only one pair of the rollers into engagement with the web to be fed or creased at the same time. Advantageously, the rollers on the same side of the web being processed are rotatably mounted on two respective common supports which are rotatable relative to each other about a common axis parallel to the axes of the rollers, and at least one hydraulic or pneumatic servo-booster is mounted between the two supports for relatively rotating the two supports on the axis.

To facilitate insertion of the web into the creping device when the device is in operation, an air nozzle device is mounted in front of the input side of the creping roller. The air nozzles are directed towards the gap formed between the delivery rolls so that when the web is required between the delivery rolls, it can be inserted into the delivery rolls and, if required, also towards the gap formed between the creping rolls.

It is also advantageous if the detection device also drives a web severing device arranged behind the output side of the crumpling roller in order to cut off the portion to be cut off from the web with the web severing device.

The invention also relates to the use of a web crumpling device according to the invention in the preparation of a cigarette filter.

Advantageously, for removing cigarette filters containing uncreped paper, the detection device is used in synchronism with the web feed to control a filter ejection device mounted after the cigarette filter cutting device near the exit end of the cigarette filter production machine, independently of the web feed speed.

The invention will be described in detail below in connection with a cigarette filter production apparatus and with reference to embodiments of the apparatus of the invention given in the accompanying drawings. As shown in the figures, in the system illustrated here, the web 2 drawn from the storage reel 1 is fed to the crumpling device 5 by means of the regulating wheel 4. During transport, the web 2 passes through a photo detection device 6.

The corrugating device 5 has two corrugating rollers 8, 8' which are in engagement and are produced in a known manner and have on their outside circumferential tooth gaps and teeth. The web 2 is fed between the creping rollers 8, 8' for processing.

The creasing rollers 8, 8 'are associated with two delivery rollers 9, 9' coupled to a drive, cooperating and adapted to engage opposite faces of the web 2.

The creping rollers 8, 8' can be adjusted very rapidly using pneumatic servo boosters 14, 15, the pneumatic servo boosters 14, 15 each comprising a cylinder and a piston slidable in the cylinder and coupled to a piston rod. The depth of engagement between the corrugating rollers is limited by a cam 10 which precisely adjusts the clearance with the support surface 11, while the support surface 13 is similarly adjustable by a cam 12, defining the non-engagement position or pressure on the feed rollers 9, 9'. The limiting surfaces are made of elastic materials. For this purpose, the rollers 8, 9 on the same side of the web 2 and the rollers 8 ', 9' on the other side are each fixed to two common supports 16, 17, respectively, and the common supports 16, 17 are relatively rotatable about a common axis 18 parallel to the axes of the rollers.

In this way, the transport rollers 9, 9' are also rapidly adjustable relative to each other, the adjustment being carried out between the disengaged position and the transport position. In the transport position, the transport rollers 9, 9' are in engagement with the web 2 being transported. The result of the adjustment of the creasing rollers 8, 8 'and of the transfer rollers 9, 9' is that only one of the two pairs of rollers 8, 8 'and 9, 9' is in a condition of disengagement with the web 2 to be transferred or creased at the same time.

As mentioned above, an electro-optical web detection device 6 that detects the web 2 being conveyed is installed between the reel 1 and the adjustment roller 4. The detection device 6 is intended to detect the portions of adhesive on the web 2 that must not be creped, in order to avoid damage to the creping rollers 8, 8'.

The output signal of the device 6 is supplied to a signal processing device 21 together with a signal representing the transport speed of the web 2 generated by the speed sensor 7. The signal processing means 21 control the control 22 of the servo motors through the line 23 so that the pneumatic servo-boosters 14 bring the creping rollers 8, 8' into their non-engaged position immediately before the passage of the portions of glue (non-creped portions), irrespective of the web feed speed, and so that the pneumatic servo-boosters 15 return them to their original operating position exactly after the passage of the portions of glue.

The roller 9 'is mounted on the same rotatable support 17 as the roller 8' and if the roller 8 'is moved to the disengaged position, the transfer roller 9' is automatically moved to its operative, i.e. engaged, position so that the web 2 is drawn virtually without interruption.

The required amount of movement is about 1 to 2 mm, the movement being performed at the point where the crumpling rollers 8, 8 'and the transfer rollers 9, 9' engage the web. The size (large module) of the creping teeth of the rolls 8, 8 ' is such that when they are disengaged from the web, they remain engaged with each other, except that they retain an enlarged interdental space, so that on the one hand the portions of adhesive on the web 2 being transported cannot damage the teeth of the rolls 8, 8 ' and on the other hand the rolls 8, 8 ' can reliably return to their creping position. When the rolls 8, 8' are disengaged from the web 2, the toothed rolls are still running in synchronism with each other, but an increased gap between the teeth remains, to avoid any risk of damage.

A common drive wheel 3 (shown in dotted lines) drives the rollers 8, 8 'and 9, 9' via a gearwheel 19 (also shown in dotted lines) and a toothed belt 20.

When the detection device 6 detects the portion of glue on the web 2 being transported, the signal supplied to the device 21 also advantageously ensures that the transport speed of the web 2 is slowed down until the portion of glue has been removed and subsequently the web 2 is increased again to its original speed.

To facilitate the insertion of the web 2 into the creping device 5 when the device is activated, an air nozzle device 24 is mounted in front of the transport rollers 9, 9 ' and directed towards the gap between the transport rollers 9, 9 ' in order to insert the beginning of the web 2 between the rollers 9, 9 '.

During transport of the web 2, the web 2 is slid between the rollers 9, 9 'and 8, 8' on horizontally oriented guide rollers (not shown).

Of course, it is possible to adjust the rollers 8, 8 'and 9, 9' separately and quickly, instead of using one common rotatable carriage 17.

After the web 2 exits the creping device 5, the web 2 is blown into a stream using a known method, namely an air nozzle 25, forming a paper strand having a circular cross-section. It is then supplied to a known cigarette filter production apparatus 26 where the paper strand is wrapped with a wrapper paper 27 to produce a longitudinally seam-bonded cigarette filter.

A filter cutting device 28, constituted by a knife rotatable about a horizontal axis, is mounted at the outlet of the device 26. The filter cutting device 28 cuts the rod-shaped filters into equal length segments regardless of the filter conveying speed.

The cut filters are fed to a orienting and ejecting device 29, the device 29 being manufactured, for example, according to the specifications of swiss patent No. 619846.

The device 29 consists of a cylinder 30 with grooves for collecting the filters and an air nozzle 32, the air nozzle 32 being controllable by a solenoid valve 31 to allow the ejection of the rejected filters to be under precise control. Subsequently, regardless of the transport speed of the web 2, the valve 31 is controlled by the signal processing device 21 so that all the filters containing the non-crimped paper are ejected as rejected products.

The apparatus is capable of producing cigarette filters made of creped paper at higher speeds than prior art apparatus (e.g., 400 m/min or more) and is not operated intermittently by the adhesive portion of the web which interferes with the creping process.

For example, the device can also be used for producing ink reservoirs to replace the production of cigarette filters.

The creping device 5 according to the invention can also be used, for example, for processing cleaning paper made of crepe paper.

Claims (4)

1. A device for crumpling a paper web, comprising at least two crumpling rollers in a mutually meshing state, between which the paper web is fed and processed, characterized in that the crumpling rollers (8, 8') are associated with at least two conveying rollers (9, 9') connected to a drive device and adapted to engage opposite sides of the paper web (2); the crumpling rollers (8, 8') are rapidly adjustable relative to each other between a non-meshing position and an adjustable support surface (11) which limits the depth of their engagement; at least one of the two crumpling rollers (8') is connected to a rapid adjustment device (14, 15), and the rapid adjustment device is driven synchronously with the web conveying; the synchronous drive is completed by a detection device (6) installed in front of the input side of the corrugating rollers (8, 8'); the detection device (6) is used to detect the part of the web that is not corrugated and is to be cut off, so that before the part to be cut off passes through, the corrugating rollers (8, 8') are brought to their non-engaged positions, and after passing through, the corrugating rollers (8, 8') return to their original operating positions. 2. The device according to claim 1, characterized in that the transport rollers (9, 9') are adjustable relative to each other between an idle position and a transport position; in the transport position, the rollers (9, 9') are in meshing engagement with the web (2) to be transported, at least one of the two transport rollers (9') being connected to a rapid adjustment device (14, 15), and the wrinkling rollers (8, 8') and the transport rollers (9, 9') are adjusted so that only one pair of rollers (8, 8') or (9, 9') is in meshing engagement with the web (2) to be transported or to be wrinkled at any one time. 3. An apparatus according to claim 1, characterized in that said rollers (8, 8' or 8', 9') on the same side of said web (2) to be processed are rotatably mounted on two common supports (16 or 17), and the two supports (16, 17) are rotatable relative to each other about a common axis parallel to the axes of the rollers. 4. The device according to claim 3, characterized in that at least one hydraulic or pneumatic servo booster (14, 15) is installed between the two supports (16, 17) for causing the two supports (16, 17) to rotate relative to each other.