Packaging system for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder

Abstract

A packaging system (1) for producing pouches comprising a water-soluble base film (18), a water-soluble cover film (10), and a fluid or powder (19), comprising multiple moulds (20), a mould conveyor (23), a base film device (26) configured to supply said base film and to position said base film on the moulds, a cover film device (30) configured to supply the water-soluble cover film and to position said cover film on said base film, a moistening device (13) configured to moisten the supplied cover film or the supplied base film, a control system (14), a sensor system (32), and wherein the control system is configured to control the moistening device to moisten said cover film or base film on basis of first moistening condition data and second moistening condition data as received from the sensor system.

Description

[0001] Title: Packaging system for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder

[0002] FIELD OF THE INVENTION

[0003] The invention relates to a packaging system for producing pouches comprising a water- soluble base film, a water-soluble cover film, and a fluid or powder. More specifically, the packaging system may be used for producing pouches containing a detergent fluid or a detergent powder.

[0004] BACKGROUND OF THE INVENTION

[0005] The known packaging system has the disadvantage that insufficiently sealed pouches are produced. As a result, fluid or powder may leak from the pouches during the production of the pouches or at a later stage. Leakage from the pouches during production may result in down time of the packaging system in order to allow cleaning operations. Leakage from the pouches at a later stage may lead to a lower customer experience.

[0006] The invention is based on the insight that there is a need in the field of the art for a packaging system which produces adequately sealed pouches in order to avoid or at least reduce the risk of leakage of fluid or powder.

[0007] SUMMARY OF THE INVENTION

[0008] The invention has the objective to provide an improved, or at least alternative, packaging system for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder.

[0009] This objective is achieved by a packaging system for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder, wherein the packaging system comprises:

[0010] - multiple moulds, each mould having a mould cavity for forming a compartment in said base film, and

[0011] - a mould conveyor configured to move the moulds in a conveying direction along a mould trajectory, such as an endless mould trajectory, and wherein the moulds are moved along:

[0012] -- a base film device configured to supply said base film and to position said base film on the moulds,

[0013] -- a compartment forming device configured to position parts of said base film in the mould cavities to form the compartments in said base film, -- a filling device comprising multiple dispensers to dispense the fluid or powder in the compartments,

[0014] -- a cover film device configured to supply a water-soluble cover film and to position said cover film on said base film and over the fluid or powder in the compartments in order to form a web of pouches holding the fluid or powder between said base film and said cover film, -- a moistening device configured to moisten the supplied cover film or the supplied base film, -- a control system configured to control the moistening device to moisten said cover film or base film, which control system is operatively coupled to the moistening device, -- a sensor system configured to acquire first moistening condition data of said cover film or base film at a first location upstream of the moistening device and second moistening condition data of said cover film or base film at a second location downstream of the moistening device, which sensor system is operatively coupled to the control system, and wherein:

[0015] — the control system is configured to control the moistening device to moisten said cover film or base film on basis of the first moistening condition data and the second moistening condition data as received from the sensor system.

[0016] The water-soluble cover film and base film have the tendency to be affected by the environment in which they are located. The conditions of the environment, such as humidity and temperature, may affect the moisture level of the cover film and base film. The cover film and base film are typically stored in the form of rolls of cover film or rolls of base film. The cover film or base film is in practice often unrolled from the film rolls and supplied to the moistening device. The moisture levels of the rolls of cover film or rolls of base film may differ from each other. This may amongst others be caused by the way the film rolls are produced and the conditions under which the film rolls are stored. In addition to this, the moisture levels of sections of the cover film or base film being unrolled from one film roll may differ from each other.

[0017] First moistening condition data of the cover film or base film acquired at a first location upstream of the moistening device by the sensor system provides an indication of the moisture level of the, respectively, cover film or base film supplied to the moistening device. Second moistening condition data of the cover film or base film acquired at a second location downstream of the moistening device by the sensor system provides an indication of the moisture level of said cover film or base film moistened by the moistening device. The cover film device is configured to supply said cover film in a cover film direction along a cover film trajectory and said first location is, for said cover film, in the cover film direction along said cover film trajectory located upstream of the moistening device. Said second location is, for said cover film, in the cover film direction along said cover film trajectory located downstream of the moistening device. The base film device is configured to supply said base film in a conveying direction along a mould trajectory and said first location is, for said base film, in the conveying direction along said mould trajectory located upstream of the moistening device. Said second location is, for said base film, in the conveying direction along said mould trajectory located downstream of the moistening device.

[0018] The control system is configured to control the operation of the moistening device on basis of the first moistening condition data and the second moistening condition data. This means that the moistening device can be controlled to achieve a desired degree of moistening of said cover film or base film while taking into account the moisture level of the used cover film or base film before being moistened by the moistening device. This allows that the moistening of said cover film or base film by the moistening device is more accurately controlled and an improved sealing can be obtained.

[0019] In an embodiment of the packaging system, the control system is configured to perform at least one calculation on the first moistening condition data and the second moistening condition data.

[0020] In an embodiment of the packaging system, the control system is configured to generate a control command based on at least one calculation and the moistening device is configured to moisten said cover film or base film according to the control command.

[0021] In an embodiment of the packaging system, the packaging system comprises a tracking system which is operatively coupled to the control system, the tracking system is configured to register when predetermined sections of said cover film or base film move through the first location and subsequently through the second location, the control system is configured to relate the first moistening condition data and the second moistening condition data to the predetermined sections of said cover film or base film and to generate the control command by performing for each of the predetermined sections of said cover film or base film at least one calculation on basis of the first moistening condition data and the second moistening condition data belonging to said predetermined section of said cover film or base film.

[0022] In an embodiment of the packaging system, the control system is configured to relate the first moistening condition data and the second moistening condition data of said cover film or base film in real-time and to generate the control command by performing calculations on basis of the first moistening condition data and the second moistening condition data belonging to different predetermined sections of said cover film or base film.

[0023] In an embodiment of the packaging system, the sensor system comprises:

[0024] - a first sensor configured to perform first measurements at the first location of said cover film or said base film and to provide first moistening condition parameter values forming the first moistening condition data of the cover film before moistening by the moistening device, and

[0025] - a second sensor configured to perform second measurements at the second location and to provide second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device.

[0026] In an embodiment of the packaging system, the first sensor is located at a first sensor distance from said cover film or base film when performing first measurements at the first location of said cover film or base film and the second sensor is located at a second sensor distance from said cover film or base film when performing second measurements at the second location of said cover film or base film, wherein the first sensor distance and the second sensor distance are preferably equal.

[0027] In an embodiment of the packaging system, the first sensor is in contact with said cover film or base film when performing first measurements at the first location of said cover film or base film, and the second sensor is in contact with said cover film or base film when performing second measurements at the first location of said cover film or base film.

[0028] In an embodiment of the packaging system, the base film device comprises a first base film roller configured to guide said base film, which first base film roller is rotatable about a first base film roller rotation axis, the base film device comprises a second base film roller configured to guide said base film, which second base film roller is rotatable about a second base film roller rotation axis, the first sensor is a first base sensor, preferably a first base capacitive base sensor, and located on the first base film roller, the second sensor is a second base sensor, preferably a second base capacitive sensor, and located on the second base film roller, the sensor system is configured to perform first measurements at the first location of said base film when the first base sensor moves along with said base film during rotation of the first base film roller, and the sensor system is configured to perform second measurements at the second location of said base film when the second base sensor moves along with said base film during rotation of the second base film roller. In an embodiment of the packaging system, the cover film device comprises a first cover film roller configured to guide said cover film, which first cover film roller is rotatable about a first cover film roller rotation axis, the cover film device comprises a second cover film roller configured to guide said cover film, which second cover film roller is rotatable about a second cover film roller rotation axis, the first sensor is a first cover sensor, preferably being a first cover capacitive sensor, and located on the first cover film roller, the second sensor is a second cover sensor, preferably a second cover capacitive sensor, and located on the second cover film roller, the sensor system is configured to perform first measurements at the first location of said cover film when the first cover sensor moves along with said cover film during rotation of the first cover film roller, and the sensor system is configured to perform second measurements at the second location of said cover film when the second cover sensor moves along with said cover film during rotation of the second cover film roller.

[0029] In an embodiment of the packaging system, the first sensor is a first capacitive sensor positioned along said cover film or base film and directed to the first location, and the second sensor is a second capacitive sensor positioned along said cover film or base film and directed to the second location, and optionally said cover film or base film comprises a first film side which is moistened by the moistening device and second film side which is not moistened by the moistening device, wherein the first capacitive sensor and the second capacitive sensor are preferably located at the second film side.

[0030] In an embodiment of the packaging system, the first sensor is a first optical sensor positioned along said cover film or base film and directed to the first location, and the second sensor is a second optical sensor positioned along said cover film or base film and directed to the second location, and optionally said cover film or base film comprises a first film side which is moistened by the moistening device and a second film side which is not moistened by the moistening device, wherein the first optical sensor and the second optical sensor are preferably located at the first film side.

[0031] In an embodiment of the packaging system, the packaging system comprises a first light source directed to the first location and a second light source directed to the second location.

[0032] The first light source may be placed on the first film side or on the second film side. The second light source may be placed on the first film side or on the second film side. This has the benefit of allowing for flexibility in the placement of the first light source and the second light source relative to said cover film or base film and the first optical sensor, and said cover film or base film and the second optical sensor, respectively. In an embodiment of the packaging system, the sensor system comprises a sensor provided on sensor movement device configured to move the sensor from a first measurement position into a second measurement position, and vice versa, which sensor is configured to perform in the first measurement position first film measurements at the first location of said cover film or base film and to provide first moistening condition parameter values forming the first moistening condition data of said cover film or base film before moistening by the moistening device and configured to perform in the second measurement position second film measurements at the second location and to provide second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device, and wherein the sensor movement device is optionally configured to control the movement of the sensor by the sensor movement device.

[0033] In some embodiments the sensor provided on the sensor movement device is a capacitive sensor directed to said cover film or base film, or an optical sensor directed to said cover film or base film.

[0034] The sensor system may be movable along said cover film or base film in a reciprocating or cyclical manner. In this way, the sensor system may acquire first moistening condition data at a first location and second moistening data at a second location of a predetermined section of said cover film or base film by moving along with or moving ahead of said predetermined section of said cover film or base film from the first location to the second location. When reaching the second location, the sensor system may acquire second moistening condition data, after which the sensor system may return to said first location in order to acquire first moistening condition data for a subsequent predetermined section of said cover film or base film. Additionally, the sensor system may acquire continuous moistening data over the distance between the first location and the second location when returning from the second location to the first location, or travelling from the first location to the second location. The first location may be located upstream of the moistening device. The second location may be located downstream of the moistening device.

[0035] In an embodiment of the packaging system, the control system is configured to perform at least one calculation on the first moistening condition parameter values and the second moistening condition parameter values to generate the control command.

[0036] In an embodiment of the packaging system, the control system is configured to perform the following calculations to generate the control command: - first moistening condition parameter value minus second moistening condition parameter value, OR

[0037] - second moistening condition parameter value minus first moistening condition parameter value, OR

[0038] - first moistening condition parameter value divided by second moistening condition parameter value, OR

[0039] - second moistening condition parameter value divided by first moistening condition parameter value.

[0040] In an embodiment of the packaging system, the moistening device is configured to supply a moistening fluid at an adjustable supply rate measured in millilitre (mL) per square meter of said cover film or base film (m2), and the control system is configured to control the supply rate (mL / m2) of said moistening fluid on basis of the first moistening condition data and the second moistening condition data.

[0041] In an embodiment of the packaging system, the control system is configured to control the moistening device to supply the moistening fluid to said cover film or base film at the supply rate (mL / m2) of between, and including, 1 mL / m2and 100 mL / m2, preferably between, and including, 10 mL / m2and 30 mL / m2.

[0042] In an embodiment of the packaging system, the moistening device comprises a moistening roller being rotatable about a moistening roller rotation axis and a roller drive configured to rotate the moistening roller around the moistening roller rotation axis at an adjustable rotational speed measured in rounds per minute (RPM), and the control system is configured to control the roller drive and to adjust the rotational speed (RPM) of the moistening roller on basis of the first moistening condition data and the second moistening condition data.

[0043] In an embodiment of the packaging system, the control system is configured to adjust a relative speed difference between the moistening roller and said cover film or base film at a contact area in which the moistening roller and said cover film or base film make contact, and wherein optionally a roller speed of the moistening roller at the contact area is between, and including, 1 % and 10% higher than a film speed of said cover film or base film at the contact area.

[0044] The moistening roller and said cover film or base film may move in the same direction or in opposite directions at a contact area between the moistening roller and said cover film or base film. The moistening of said cover film or base film is, in part, dependent on the relative movement of the moistening roller relative to said cover film or base film.

[0045] In an embodiment of the packaging system, the cover film device or base film device are configured to move said cover film or base film, respectively, relative to the moistening roller in order to adjust a film contact angle (a) along which the moistening roller is in contact with said cover film or base film.

[0046] In an embodiment of the packaging system, the moistening device is configured to move the moistening roller relative to said cover film or base film in order to adjust a film contact angle (a) along which the moistening roller is in contact with said cover film or base film.

[0047] In an embodiment of the packaging system, the moistening device comprises a moistening roller movement device configured to move the moistening roller relative to said cover film or base film in order to adjust the film contact angle (a) between the moistening roller and the cover film or base film.

[0048] In an embodiment of the packaging system, the moistening roller movement device is operatively coupled to the control system, and the control system is configured to control the movement of the moistening roller by the movement device, preferably in order to adjust the film contact angle (a) on basis of the first moistening condition data and the second moistening condition data.

[0049] In an embodiment of the packaging system, the packaging system comprises an adjustable moistening fluid supply configured to supply moistening fluid to the moistening device and operatively coupled to the control system, and wherein the control system is configured to control the moistening fluid supply and to adjust the amount of moistening fluid supplied to the moistening device on basis of the first moistening condition data and the second moistening condition data.

[0050] In an embodiment of the packaging system, the moistening fluid supply comprises a slotdie head positioned adjacent to the moistening roller, and the slot-die head is configured to supply moistening fluid to the moistening roller.

[0051] In an embodiment of the packaging system, the moistening roller comprises an outer moistening surface configured to contact said cover film or base film and the slot-die head comprises a fluid discharge opening located adjacent to the outer moistening surface. In an embodiment of the packaging system, the fluid discharge opening has an elongated form, preferably an elongated rectangle, and the fluid discharge opening extends parallel to the moistening roller rotation axis.

[0052] In an embodiment of the packaging system, the fluid slot-die head and the moistening roller are configured to maintain a constant distance between the fluid discharge opening and the outer moistening surface during rotation of the moistening roller around the moistening roller rotation axis.

[0053] In an embodiment of the packaging system, the fluid discharge opening extends horizontally.

[0054] In an embodiment of the packaging system, the moistening roller rotation axis extends horizontally.

[0055] In an embodiment of the packaging system, the slot-die head is configured to supply moistening fluid in vertical direction to the moistening roller.

[0056] In an embodiment of the packaging system, the moistening fluid supply comprises a spray head directed to the moistening roller, and the spray head is configured to supply moistening fluid to the moistening roller.

[0057] In an embodiment of the packaging system, the moistening roller comprises an outer moistening surface configured to contact said cover film or base film and the spray head comprises nozzle openings directed to the outer moistening surface.

[0058] In an embodiment of the packaging system, the nozzle openings are aligned and the aligned nozzle openings together extend parallel to the moistening roller rotation axis.

[0059] In an embodiment of the packaging system, the packaging system comprises a first moistening device configured to moisten said cover film and a second moistening device configured to moisten said base film.

[0060] In this way, the moisture content of interacting surfaces of the cover film and the base film can be more accurately controlled, and an improved sealing can be obtained. It will be clear to the skilled person that any combination of any number of the above identified embodiments of the packaging system may be made.

[0061] The present invention further relates to a method for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder, such as a detergent fluid or detergent powder, wherein the method comprises:

[0062] - moving multiple moulds in a conveying direction along a mould trajectory, such as an endless mould trajectory, wherein each mould has a mould cavity for forming a compartment in said base film,

[0063] - positioning the base film on the moulds,

[0064] - positioning parts of said base film in the mould cavities to form the compartments in said base film,

[0065] - dispensing the fluid or powder in the compartments,

[0066] - moistening said cover film or base film with a moistening device,

[0067] - positioning said cover film on said base film and over the fluid or powder in the compartments in order to form a web of pouches holding the fluid or powder between said base film and said cover film,

[0068] - acquiring first moistening condition data of said cover film or base film at a first location upstream of the moistening device and second moistening condition data of said cover film or base film at a second location downstream of the moistening device with a sensor system being operatively coupled to a control system for controlling the moistening device, and

[0069] - controlling the moistening of said cover film or base film by the moistening device with the control system on basis of the first moistening condition data and the second moistening condition data.

[0070] In an embodiment of the method, the method comprises the step of performing at least one calculation on the first moistening condition data and the second moistening condition data with the control system.

[0071] In an embodiment of the method, the method comprises the step of generating a control command based on said at least one calculation with the control system.

[0072] In an embodiment of the method, the method comprises the steps of:

[0073] - registering when predetermined sections of said cover film or base film move through the first location and subsequently through the second location using a tracking system, wherein the tracking system is operatively coupled to the control system, - relating the first moistening condition data and the second moistening condition data to the predetermined sections of said cover film or base film.

[0074] In an embodiment of the method, the method comprises the steps of:

[0075] - relating the first moistening condition data and the second moistening condition data of said cover film or base film in real-time with the control system,

[0076] - generating the control command by performing calculations on basis of the first moistening condition data and the second moistening condition data belonging to different predetermined sections of said cover film or base film.

[0077] In an embodiment of the method, the method comprises the steps of:

[0078] - performing first measurements at the first location of said cover film or base film with a first sensor,

[0079] - providing first moistening condition parameter values forming the first moistening condition data of said cover film or base film before moistening by the moistening device with the first sensor,

[0080] - performing second measurements at the second location with a second sensor, and

[0081] - providing second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device with the second sensor.

[0082] It will be clear to the skilled person that any combination of any number of the above identified embodiments of the method may be made.

[0083] BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Embodiments of the packaging system according to the invention and the method according to the invention will be described by way of example only, with reference to the accompanying schematic drawings in which corresponding reference symbols indicate corresponding parts, and in which:

[0085] Figure 1 schematically shows a side view of a first embodiment of the packaging system and method according to the invention,

[0086] Figure 2 schematically shows a side view of a second embodiment of the packaging system and method according to the invention,

[0087] The Figure 3A and 3B schematically show an enlarged view of part III of the packaging system of figure 1,

[0088] Figure 30 schematically shows a further enlarged view of the figures 3A and 3B, Figure 4 schematically shows an alternative embodiment of figure 3A, Figure 5 schematically shows another alternative embodiment of figure 3A, Figure 6 schematically shows another alternative embodiment of figure 3A, Figure 7A schematically shows another alternative embodiment, Figure 7B schematically shows an enlarged view of the slot-die head of figure 7A, Figure 7C schematically shows a view in direction of arrow 93 of figure 7B, Figure 8A schematically shows another alternative embodiment, Figure 8B schematically shows an enlarged view of the spray head of figure 8A, Figure 8C schematically shows a view in direction of arrow 93 of figure 8B, and Figure 9 schematically shows an alternative embodiment of figure 1.

[0089] DETAILED DESCRIPTION OF THE DRAWINGS

[0090] Figure 1 shows an overview of a first embodiment of the packaging system 1 and method according to the invention. The packaging system 1 is configured to produce pouches comprising a water-soluble base film 18, a water-soluble cover film 10, and a fluid or powder 19. In particular, the fluid or powder 19 may be a detergent fluid or detergent powder.

[0091] The packaging system 1 comprises multiple moulds 20, each mould 20 comprising a mould cavity 21 for forming a compartment 22 in the base film 18. A mould conveyor 23 is configured to move the moulds 20 in a conveying direction 24 along a mould trajectory, in particular an endless mould trajectory. The mould conveyor 23 is embodied as a mould conveyor belt 25. The moulds 20 are moved along a base film device 26 configured to supply said base film 18 and to position said base film 18 on the moulds 20. The packaging system 1 further comprises a compartment forming device 27 configured to position parts of said base film 18 in the mould cavities 21 to form the compartments 22 in said base film 18. The filling device 28 comprises multiple dispensers 29 to dispense the fluid or powder 19 in the compartments 22. The cover film device 30 is configured to supply a water-soluble film 10 and to position said cover film 10 on said base film 18 and over the fluid or powder 19 in the compartments 22, in order to form a web of pouches 31 holding the fluid or powder 19 between said base film 18 and said cover film 10. The moistening device 13 is configured to moisten said supplied cover film 10.

[0092] Figure 2 shows an overview of a second embodiment of the packaging system 1 and method according to the invention. This embodiment differs from figure 1 in that the mould conveyor 23 is embodied as a rotary drum 46, creating an endless mould trajectory.

[0093] Figure 3A shows an enlarged view of part III of the packaging system 1 of figure 1. A control system 14 is configured to control the moistening device 13 to moisten the cover film 10, which control system 14 is operatively coupled to the moistening device 13 and the sensor system 32. The sensor system 32 is configured to acquire first moistening data of the cover film 10 at a first location 33 upstream of the moistening device 13 and second moistening condition data of the cover film 10 at a second location 34 downstream of the moistening device 13. The control system 14 is configured to control the moistening device 13 to moisten the cover film 10 on basis of the first moistening condition data and the second moistening condition data as received from the sensor system 32.

[0094] The water-soluble cover film 10 has the tendency to be affected by the environment in which it is located. The conditions of the environment, such as humidity and temperature, may affect the moisture level of the cover film 10. The cover film 10 is typically stored in the form of rolls of cover film 10. The cover film 10 is in practice often unrolled from the film rolls and supplied to the moistening device 13. The moisture levels of the rolls of cover films 10 may differ from each other. This may amongst others be caused by the way the film rolls are produced and the conditions under which the film rolls are stored. In addition to this, the moisture levels of sections 36 of the cover film 10 being unrolled from one film roll may differ from each other.

[0095] First moistening condition data of the cover film 10 acquired at a first location 33 upstream of the moistening device 13 by the sensor system 32 provides an indication of the moisture level of the cover film 10 supplied to the moistening device 13. Second moistening condition data of the cover film 10 acquired at a second location 34 downstream of the moistening device 13 by the sensor system 32 provides an indication of the moisture level of the cover film 10 moistened by the moistening device 13. The cover film device 30 is configured to supply said cover film 10 in a cover film direction 58 along a cover film trajectory 59 and said first location 33 is in the cover film direction 58 along said cover film trajectory 59 located upstream of the moistening device 13. Said second location 34 is in the cover film direction 58 along said cover film trajectory 59 located downstream of the moistening device 13.

[0096] The control system 14 is configured to control the operation of the moistening device 13 on basis of the first moistening condition data and the second moistening condition data. This means that the moistening device 13 can be controlled to achieve a desired degree of moistening of the cover film 10 while taking into account the moisture level of the used cover film 10 before being moistened by the moistening device 13. This allows that the moistening of the cover film 10 by the moistening device 13 is more accurately controlled and an improved sealing can be obtained. The moistening device 13 comprises a moistening roller movement device 62. The moistening roller movement device 62 is configured to move a moistening roller 16 relative to the cover film 10. The moistening roller movement device 62 may be used to adjust a film contact angle (a), as shown in figure 3C, along which the moistening roller is in contact with said cover film 10.

[0097] In figure 3B, the moistening roller 16 has been moved relative to the cover film 10, such that the film contact angle (a), as shown in figure 3C, has increased. A larger film contact angle (a) leads to a larger contact area 44 between the cover film 10 and the moistening roller 16.

[0098] The film contact angle (a)tends to be an effective parameter for controlling the amount of moisture transferred from the moistening roller 16 to the cover film 10.

[0099] The first moistening condition data of the cover film 10 at the first location 33 upstream of the moistening device 13 acquired by the sensor system 32 relates, directly or indirectly, to the moisture level of the cover film 10 before being moistened by the moistening device 13. The second moistening condition data of the cover film 10 at the second location 34 downstream of the moistening device 13 acquired by the sensor system 32 relates, directly or indirectly, to the moisture level of the cover film 10 after being moistened by the moistening device 13.

[0100] The control system 14 is configured to perform at least one calculation on the first moistening condition data and the second moistening condition data, and is configured to generate a control command based on said at least one calculation, with the moistening device 13 being configured to moisten the cover film 10 according to the control command.

[0101] The cover film 10 contacts the wetting roller 16 at the contact area 44, wetting the cover film 10. A tracking system 35 registers when predetermined sections 36 of the cover film 10 move through the first location 33 and subsequently through the second location 34. The tracking system 35 is operatively coupled to the control system 14. The control system 14 is configured to relate the first moistening condition data and the second moistening condition data to the predetermined sections 36 of the cover film 10.

[0102] The control system 14 may be configured to generate the control command by performing for each of the predetermined sections 36 of the cover film 10 at least one calculation on basis of the first moistening condition data and the second moistening condition data belonging to said predetermined section 36 of the cover film 10. Alternatively, the control system 14 may be configured to relate the first moistening condition data and the second moistening condition data of the cover film 10 in real-time. The control system 14 then generates the control command by performing calculations on basis of the first moistening condition data and the second moistening condition data belonging to different predetermined sections 36 of the cover film 10.

[0103] In the embodiment of the packaging system 1 shown in figure 3A, the sensor system 32 of the packaging system 1 comprises a first sensor 11 and a second sensor 12. The first sensor 11 is configured to perform first measurements at the first location 33 of the cover film 10 and provides first moistening condition parameter values, forming the first moistening condition data, of the cover film 10 before moistening by the moistening device 13. The second sensor 12 is configured to perform second measurements at the second location 34 and provides second moistening condition parameter values, forming the second moistening condition data, of the cover film 10 after moistening by the moistening device 13. The first sensor 11 is located at a first sensor distance 37 from the cover film 10. The second sensor 12 is located at a second sensor distance 38 from the cover film 10, with the first sensor distance 37 and second sensor distance 38 being equal.

[0104] The first sensor 11 is a first capacitive sensor 51 and the second sensor 12 is a second capacitive sensor 52. It is preferred that the first sensor distance 37 and the second sensor distance 38 do not fluctuate to prevent noise in the first moistening condition data and the second moistening condition data.

[0105] In some embodiments (not shown) in which the first sensor 11 is a first capacitive sensor 51 and the second sensor 12 is a second capacitive sensor 52, the first sensor 11 makes contact with the cover film 10 at the first location 33 on the second film side 48 which is not moistened by the moistening device 13, and the second sensor 12 makes contact with the cover film 10 at the second location 34 on the second film side 48 which is not moistened by the moistening device 13.

[0106] The cover film 10 has a first film side 47 which is moistened by the moistening device 13 and a second film side 48 which is not moistened by the moistening device 13.

[0107] The first sensor 11 is a first capacitive sensor 51 positioned along the cover film 10 and directed to the first location 33 and the second sensor 12 is a second capacitive sensor 52 positioned along the cover film 10 and directed to the second location 34. The first capacitive sensor 51 and second capacitive sensor 52 are preferably located at the second film side 48. The first capacitive sensor 51 and the second capacitive sensor 52 may, for instance, be Litronic-FMS CCS planar sensors from Liebherr.

[0108] The control system 14 may perform at least one calculation on the first moistening condition parameter values and the second moistening condition parameter values to generate a control command. The control system 14 is configured to perform the following calculations to generate the control command: first moistening condition parameter value minus second moistening condition parameter value, or second moistening condition parameter value minus first moistening condition parameter value, or first moistening condition parameter value divided by second moistening condition parameter value, or second moistening condition parameter value divided by first moistening condition parameter value.

[0109] The moistening device 13 comprises a moistening roller 16, which is rotatable about a moistening roller rotation axis 43. The moistening device 13 further comprises a roller drive 17 configured to rotate the moistening roller 16 around the moistening roller rotation axis 43 at an adjustable rotational speed measure in round per minute (RPM). The control system 14 is configured to control the roller drive 17 on basis of first moistening condition data and second moistening condition data. The control system 14 is further configured to adjust a relative speed difference between the moistening roller 16 and the cover film 10 at a contact area 44 in which the moistening roller 16 and the cover film 10 make contact. The roller speed of the moistening roller 16 is optionally between, and including, 1% and 10% higher than a film speed of the cover film 10 at the contact area 44. The moistening roller 16 and cover film 10 may move in the same direction or in opposite directions at the contact area 44.

[0110] The moistening device 13 of the packaging system 1 in figures 1 and 2 is configured to supply moistening fluid at an adjustable supply rate measured in millilitre (mL) per square meter of cover film 10 (m2). The control system 14 is configured to control the supply rate (mL / m2) of the moistening fluid on basis of the first moistening condition data and the second moistening condition data. The supply rate (mL / m2) may be between, and including, 1 mL / m2and 100 mL / m2, preferably between, and including, 10 mL / m2and 30 mL / m2.

[0111] The packaging system 1 comprises an adjustable moistening fluid supply 15 configured to supply moistening fluid to the moistening device 13. The moistening fluid supply 15 is operatively coupled to the control system 14. The control system 14 is configured to control the moistening fluid supply 15 and to adjust the amount of moistening fluid supplied to the moistening device 13 on basis of first moistening condition data and second moistening condition data. The first sensor 11 is operatively coupled to the control system 14 through a first sensor connection 65. The second sensor 12 is operatively coupled to the control system 14 through a second sensor connection 66. The roller drive 17 is operatively coupled to the control system 14 through a roller drive connection 67. The moistening fluid supply 15 is operatively coupled to the control system 14 through a moistening fluid supply connection 69. The tracking system 35 is operatively coupled to the control system 14 through a tracking system connection 70. The moistening roller movement device 62 is operatively coupled to the control system 14 through a moistening roller movement device connection 71. Connections to the control system 14 may be e.g. wired connections using for instance electrical wires, or wireless connections utilising for instance electromagnetic radiation.

[0112] Figure 3C shows a further enlarged view of the figures 3A and 3B. Two positions of the moistening roller 16 are shown. In the position of the moistening roller 16 to the right of the figure, a small film contact angle (a) exists between the cover film 10 and the moistening roller 16. This leads to a small contact area 44 between the cover film 10 and the moistening roller 16. In the position of the moistening roller 16 to the left of the figure, shown in dashed lines, the film contact angle (a) is larger, leading to a larger contact area 44 between the cover film 10 and the moistening roller 16. The moistening roller 16 is moved by a moistening roller movement device 62 along a moistening roller movement direction 76, preferably in order to adjust the film contact angle (a) on basis of the first moistening condition data and the second moistening condition data.

[0113] The skilled person will appreciate that instead of or in addition to the moistening device 13 being configured to move the moistening roller 16 relative to said cover film 10 in order to adjust a film contact angle (a) along which the moistening roller 16 is in contact with said cover film 10, the cover film device 30 may be configured to move said cover film 10 relative to the moistening roller 16 of the first moistening device 13 in order to adjust the film contact angle (a).

[0114] In the embodiment of the packaging system 1 shown in figure 4, the first sensor 11 is a first optical sensor 53 positioned along the cover film 10 and directed to the first location 33. The second sensor 12 is a second optical sensor 54 positioned along the cover film 10 and directed to the second location 34. Optionally, the cover film 10 comprises a first film side 47 which is moistened by the moistening device 13 and a second film side 48 which is not moistened by the moistening device 13, wherein the first optical sensor 53 and the second optical sensor 54 are preferably located at the first film side 47. In the embodiment shown in figure 4, the first optical sensor 53 and the second optical sensor 54 are positioned at the second film side 48. A first light source 49 is directed to the first location 33 and a second light source 50 is directed to the second location 34.

[0115] The first light source 49 may be placed on the first film side 47 or on the second film side 48. The second light source 50 may be placed on the first film side 47 or on the second film side 48. This has the benefit of allowing for flexibility in the placement of the first light source 49 and the second light source 50 relative to the cover film 10 and the first optical sensor 53, and the cover film 10 and the second optical sensor 54, respectively.

[0116] The first light source 49 is operatively coupled to the control system 14 through a first light source connection 72. The second light source 50 is operatively coupled to the control system 14 through a second light source connection 73. Connections to the control system 14 may be e.g. wired connections using for instance electrical wires, or wireless connections utilising for instance electromagnetic radiation. The first optical sensor 53 and the second optical sensor 54 may be infrared sensors or hyperspectral sensors, such as the Specim SWIR or Specim FX17.

[0117] It will be clear to the skilled person that the embodiment of the packaging system 1 shown in figure 4 may comprise a tracking system 35, as shown in figure 3A, which is operatively coupled to the control system 14 and is configured to register when predetermined sections 36 of the cover film 10 move through the first location 33 and subsequently through the second location 34.

[0118] In the embodiment of the packaging system 1 shown in figure 5, the sensor system 32 of the packaging system 1 comprises a sensor 57 provided on a sensor movement device 41 configured to move the sensor 57 from a first measurement position 55 into a second measurement position 56, and vice versa, along a sensor movement direction 77. The sensor 57 is configured to perform in the first measurement position 55 first measurements at the first location 33 of the cover film 10 and to provide first moistening condition parameter values forming the first moistening condition data of the cover film 10 before moistening by the moistening device 13. The sensor 57 is configured to perform in the second measurement position 56 second measurements at the second location 34 and to provide second moistening condition parameter values forming the second moistening condition data of the cover film 10 after moistening by the moistening device 13.

[0119] In this way, first measurements at the first location 33 of the cover film 10 and second measurements at the second location 34 of the cover film 10 can be performed by a single sensor 57. The sensor 57 can thus provide both first moistening condition parameter values and second moistening condition parameter values, forming first moistening condition data before moistening by the moistening device 13 and second moistening condition data after moistening by the moistening device 13 of the cover film 10 respectively.

[0120] The sensor 57 provided on the sensor movement device 41 may be a capacitive sensor directed to the cover film 10 or an optical sensor directed to the cover film 10. The sensor 57 is operatively coupled to the control system 14 through a sensor connection 74. The sensor movement device 41 is operatively coupled to the control system 14 through a sensor movement device connection 75. Connections to the control system 14 may be e.g. wired connections using for instance electrical wires, or wireless connections utilising for instance electromagnetic radiation.

[0121] In the embodiment of the packaging system 1 shown in figure 6, the cover film device 30 comprises a first cover film roller 80 and a second cover film roller 83 configured to guide said cover film 10. The first cover film roller 80 is rotatable (see arrow 82) about a first cover film roller rotation axis 81. The second cover film roller 83 is rotatable (see arrow 85) about a second cover film roller rotation axis 84.

[0122] The first sensor 11 is a first cover sensor 86, preferably a first cover capacitive sensor, and located on the first cover film roller 80. The second sensor 12 is a second cover sensor 87, preferably a second cover capacitive sensor, and located on the second cover film roller 83.

[0123] The sensor system 32 is configured to perform first measurements at the first location 33 of said cover film 10 when the first cover sensor 86 moves along with said cover film 10 during rotation of the first cover film roller 80. In addition, the sensor system 32 is configured to perform second measurements at the second location 34 of said cover film 10 when the second cover sensor 87 moves along with said cover film 10 during rotation of the second cover film roller 83.

[0124] It will be clear that the embodiment of figure 6 can be applied in a similar way to the base film device 26.

[0125] In the embodiment of the packaging system 1 shown in the figures 7A-C, the moistening fluid supply 15 comprises a slot-die head 88 positioned adjacent to the moistening roller 16. The slot-die head 88 is configured to supply moistening fluid to the moistening roller 16. This way a more homogeneous moistening of said cover film 10 tends to be achieved.

[0126] The moistening roller 16 comprises an outer moistening surface 90 configured to contact said cover film 10 (or base film 18) and the slot-die head 88 comprises fluid discharge opening 89 located adjacent to the outer moistening surface 90.

[0127] The fluid discharge opening 89 has an elongated form, more specifically the form of an elongated rectangle. The fluid discharge opening 89 extends parallel to the moistening roller rotation axis 43. The fluid slot-die head 88 and the moistening roller 16 are configured to maintain a constant distance between the fluid discharge opening 89 and the outer moistening surface 90 during rotation of the moistening roller 16 around the moistening roller rotation axis 43.

[0128] The arrows 91 and 92 of figure 7C show a horizontal and vertical direction, respectively. The fluid discharge opening 89 and the moistening roller rotation axis 43 extend horizontally. The slot-die head 88 is configured to supply moistening fluid in vertical direction to the moistening roller (see arrows 94). Each of these measures tends to allow a more homogeneous supply of moistening fluid along the moistening roller 16.

[0129] In the embodiment of the packaging system 1 shown in the figures 8A-C, the moistening fluid supply 15 comprises a spray head 95 directed to the moistening roller 16, and the spray head 95 is configured to supply moistening fluid to the moistening roller 16.

[0130] The spray head 95 comprises nozzle openings 96 directed to the outer moistening surface 90 of the moistening roller 16. The nozzle openings 96 are aligned and the aligned nozzle openings 96 together extend parallel to the moistening roller rotation axis 43.

[0131] Figure 9 depicts an alternative embodiment of figure 1. In this embodiment, the packaging system 1 comprises a first moistening device 13 and a second moistening device 113. The first moistening device 13 is configured to moisten the cover film 10. The second moistening device 113 is configured to moisten the base film 18. The first moistening device 13 and the second moistening device 113 are analogous to each other, except for the second moistening device 113 in this embodiment not comprising a moistening roller movement device 62. Both the first moistening device 13 and the second moistening device 113 comprise a first sensor 11 , 111, a second sensor 12, 112, a control system 14, 114, a moistening fluid supply 15, 115 and a moistening roller 15, 115. The base film device 26 is configured to move the base film 18 relative to the moistening roller 116 of the second moistening device 113, in order to adjust the film contact angle (a) along which the moistening roller 116 is in contact with the base film 18. This is achieved by moving the guide roller 61 relative to the moistening roller 116 (not shown). Further measures may be taken to keep the second sensor 112 at a constant second sensor distance from the base film 18.

[0132] Because the alternative embodiment in figure 9 comprises both a first moistening device 13 and a second moistening device 113, the cover film 10 and the base film 18 are moistened. In this way, the moisture content of interacting surfaces of the cover film 10 and the base film 18 can be more accurately controlled, and an improved sealing can be obtained.

[0133] As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting, but rather, to provide an understandable description of the invention.

[0134] The terms "a" or "an", as used herein, are defined as one or more than one. The term plurality, as used herein, is defined as two or more than two. The term another, as used herein, is defined as at least a second or more. The terms including and / or having, as used herein, are defined as comprising (i.e. , open language, not excluding other elements or steps). Any reference signs in the claims should not be construed as limiting the scope of the claims or the invention.

[0135] It will be apparent to those skilled in the art that various modifications can be made to the device and method shown in the drawings without departing from the scope as defined in the claims.

Claims

CLAIMS1. Packaging system (1) for producing pouches comprising a water-soluble base film (18), a water-soluble cover film (10), and a fluid or powder (19), such as a detergent fluid or detergent powder, wherein the packaging system comprises:- multiple moulds (20), each mould (20) having a mould cavity (21) for forming a compartment (22) in said base film, and- a mould conveyor (23) configured to move the moulds in a conveying direction (24) along a mould trajectory, such as an endless mould trajectory, and wherein the moulds are moved along:-- a base film device (26) configured to supply said base film and to position said base film on the moulds,-- a compartment forming device (27) configured to position parts of said base film in the mould cavities to form the compartments in said base film,-- a filling device (28) comprising multiple dispensers (29) to dispense the fluid or powder in the compartments,-- a cover film device (30) configured to supply a water-soluble cover film (10) and to position said cover film on said base film and over the fluid or powder in the compartments in order to form a web of pouches (31) holding the fluid or powder between said base film and said cover film,-- a moistening device (13) configured to moisten the supplied cover film or the supplied base film,-- a control system (14) configured to control the moistening device to moisten said cover film or base film, which control system is operatively coupled to the moistening device, -- a sensor system (32) configured to acquire first moistening condition data of said cover film or base film at a first location (33) upstream of the moistening device and second moistening condition data of said cover film or base film at a second location (34) downstream of the moistening device, which sensor system is operatively coupled to the control system, and wherein:- the control system is configured to control the moistening device to moisten said cover film or base film on basis of the first moistening condition data and the second moistening condition data as received from the sensor system.

2. Packaging system according to claim 1 , wherein the control system is configured to perform at least one calculation on the first moistening condition data and the second moistening condition data.

3. Packaging system according to claim 2, wherein the control system is configured to generate a control command based on said at least one calculation and the moistening device is configured to moisten said cover film or base film according to the control command.

4. Packaging system according to claim 3, wherein:- the packaging system comprises a tracking system (35) which is operatively coupled to the control system,- the tracking system is configured to register when predetermined sections (36) of said cover film or base film move through the first location and subsequently through the second location,- the control system is configured to relate the first moistening condition data and the second moistening condition data to the predetermined sections of said cover film or base film and to generate the control command by performing for each of the predetermined sections of said cover film or base film said at least one calculation on basis of the first moistening condition data and the second moistening condition data belonging to said predetermined section of said cover film or the base film.

5. Packaging system according to claim 3, wherein the control system is configured to relate the first moistening condition data and the second moistening condition data of said cover film or base film in real-time and to generate the control command by performing calculations on basis of the first moistening condition data and the second moistening condition data belonging to different predetermined sections of said cover film or base film.

6. Packaging system according to any one of the preceding claims, wherein the sensor system comprises:- a first sensor (11) configured to perform first measurements at the first location of said cover film or base film and to provide first moistening condition parameter values forming the first moistening condition data of said cover film or base film before moistening by the moistening device, and- a second sensor (12) configured to perform second measurements at the second location and to provide second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device.

7. Packaging system according to claim 6, wherein:- the first sensor is located at a first sensor distance (37) from said cover film or base film when performing first measurements at the first location of said cover film or base film,- the second sensor is located at a second sensor distance (38) from said cover film or base film when performing second measurements at the second location of said cover film or base film, and- the first sensor distance and the second sensor distance are preferably equal.

8. Packaging system according to claim 6, wherein:- the first sensor is in contact with said cover film or base film when performing first measurements at the first location of said cover film or base film, and- the second sensor is in contact with said cover film or base film when performing second measurements at the first location of said cover film or base film.

9. Packaging system according to any one of the claims 6 - 8, wherein:- the base film device comprises a first base film roller configured to guide said base film, which first base film roller is rotatable about a first base film roller rotation axis,- the base film device comprises a second base film roller configured to guide said base film, which second base film roller is rotatable about a second base film roller rotation axis,- the first sensor is a first base sensor, preferably a first base capacitive base sensor, and located on the first base film roller,- the second sensor is a second base sensor, preferably a second base capacitive sensor, and located on the second base film roller,- the sensor system is configured to perform first measurements at the first location of said base film when the first base sensor moves along with said base film during rotation of the first base film roller, and- the sensor system is configured to perform second measurements at the second location of said base film when the second base sensor moves along with said base film during rotation of the second base film roller.

10. Packaging system according to any one of the claims 6 - 9, wherein:- the cover film device comprises a first cover film roller configured to guide said cover film, which first cover film roller is rotatable about a first cover film roller rotation axis,- the cover film device comprises a second cover film roller configured to guide said cover film, which second cover film roller is rotatable about a second cover film roller rotation axis,- the first sensor is a first cover sensor, preferably a first cover capacitive sensor, and located on the first cover film roller,- the second sensor is a second cover sensor, preferably a second cover capacitive sensor, and located on the second cover film roller,- the sensor system is configured to perform first measurements at the first location of said cover film when the first cover sensor moves along with said cover film during rotation of the first cover film roller, and- the sensor system is configured to perform second measurements at the second location of said cover film when the second cover sensor moves along with said cover film during rotation of the second cover film roller.

11. Packaging system according to any one of the claims 6 - 7, wherein:- the first sensor is a first capacitive sensor positioned along said cover film or base film and directed to the first location, and- the second sensor is a second capacitive sensor positioned along said cover film or base film and directed to the second location, and optionally- said cover film or base film comprises a first film side which is moistened by the moistening device and second film side which is not moistened by the moistening device, wherein the first capacitive sensor and the second capacitive sensor are preferably located at the second film side.

12. Packaging system according to any one of the claims 6 - 8, wherein:- the first sensor is a first optical sensor positioned along said cover film or base film and directed to the first location, and- the second sensor is a second optical sensor positioned along said cover film or base film and directed to the second location, and optionally- said cover film or base film comprises a first film side which is moistened by the moistening device and a second film side which is not moistened by the moistening device, wherein the first optical sensor and the second optical sensor are preferably located at the first film side.

13. Packaging system according to claim 9, wherein the packaging system comprises a first light source directed to the first location and a second light source directed to the second location.

14. Packaging system according to any one of the claims 1 - 5, wherein the sensor system comprises a sensor provided on a sensor movement device (41) configured to move thesensor from a first measurement position into a second measurement position, and vice versa, which sensor is configured to perform in the first measurement position first measurements at the first location of said cover film or base film and to provide first moistening condition parameter values forming the first moistening condition data of said cover film or base film before moistening by the moistening device and configured to perform in the second measurement position second measurements at the second location and to provide second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device, and wherein the sensor movement device is optionally operatively coupled to the control system, and wherein the control system is optionally configured to control the movement of the sensor by the sensor movement device.

15. Packaging system according to any one of the claims 6 - 11 , wherein the control system is configured to perform at least one calculation on the first moistening condition parameter values and the second moistening condition parameter values to generate the control command.

16. Packaging system according to any one of the claims 6 - 12, wherein the control system is configured to perform the following calculation to generate the control command:- first moistening condition parameter value minus second moistening condition parameter value, OR- second moistening condition parameter value minus first moistening condition parameter value, OR- first moistening condition parameter value divided by second moistening condition parameter value, OR- second moistening condition parameter value divided by first moistening condition parameter value.

17. Packaging system according to any one of the preceding claims, wherein the moistening device is configured to supply a moistening fluid at an adjustable supply rate measured in millilitre (mL) per square meter of said cover film or base film (m2), and the control system is configured to control the supply rate (mL / m2) of said moistening fluid on basis of the first moistening condition data and the second moistening condition data.

18. Packaging system according to claim 14, wherein the control system is configured to control the moistening device to supply the moistening fluid to said cover film or base film at the supply rate (mL / m2) of between, and including, 1 mL / m2and 100 mL / m2, preferablybetween, and including, 10 mL / m2and 30 mL / m2.

19. Packaging system according to any one of the preceding claims, wherein the moistening device comprises a moistening roller (16) being rotatable about a moistening roller rotation axis (43).

20. Packaging system according to claim 19, wherein the moistening device comprises a roller drive (17) configured to rotate the moistening roller around the moistening roller rotation axis at an adjustable rotational speed measured in rounds per minute (RPM), and the control system is configured to control the roller drive and to adjust the rotational speed (RPM) of the moistening roller on basis of the first moistening condition data and the second moistening condition data.

21. Packaging system according to claim 20, wherein the control system is configured to adjust a relative speed difference between the moistening roller and said cover film or base film at a contact area (44) in which the moistening roller and said cover film or base film make contact, and wherein optionally a roller speed of the moistening roller at the contact area is between, and including, 1 % and 10% higher than a film speed of said cover film or base film at the contact area.

22. Packaging system according to claim 20 or 21 , wherein the cover film device or base film device are configured to move said cover film or base film, respectively, relative to the moistening roller in order to adjust a film contact angle (a) along which the moistening roller is in contact with said cover film or base film.

23. Packaging system according to any one of the claim 20 - 22, wherein the moistening device is configured to move the moistening roller relative to said cover film or base film in order to adjust a film contact angle (a) along which the moistening roller is in contact with said cover film or base film.

24. Packaging system according to claim 23, wherein the moistening device comprises a moistening roller movement device (62) configured to move the moistening roller relative to said cover film or base film in order to adjust the film contact angle (a).

25. Packaging system according to claim 25, wherein the moistening roller movement device (62) is operatively coupled to the control system, and the control system is configured to control the movement of the moistening roller by the movement device (62), preferably inorder to adjust the film contact angle (a) on basis of the first moistening condition data and the second moistening condition data.

26. Packaging system according to any one of the preceding claims, wherein the packaging system comprises an adjustable moistening fluid supply (15) configured to supply moistening fluid to the moistening device and operatively coupled to the control system, and wherein the control system is configured to control the moistening fluid supply and to adjust the amount of moistening fluid supplied to the moistening device on basis of the first moistening condition data and the second moistening condition data.

27. Packaging system according to claim 26 and in combination with claim 19, wherein:- the moistening fluid supply comprises a slot-die head positioned adjacent to the moistening roller, and- the slot-die head is configured to supply moistening fluid to the moistening roller.

28. Packaging system according to claim 27, wherein the moistening roller comprises an outer moistening surface configured to contact said cover film or base film and the slot-die head comprises a fluid discharge opening located adjacent to the outer moistening surface.

29. Packaging system according to claim 28, wherein the fluid discharge opening has an elongated form, preferably an elongated rectangle, and the fluid discharge opening extends parallel to the moistening roller rotation axis.

30. Packaging system according to claim 28 or 29, wherein the fluid slot-die head and the moistening roller are configured to maintain a constant distance between the fluid discharge opening and the outer moistening surface during rotation of the moistening roller around the moistening roller rotation axis.

31. Packaging system according to any one of the claims 28 - 30, wherein the fluid discharge opening extends horizontally.

32. Packaging system according to any one of the claims 19 - 31, wherein the moistening roller rotation axis extends horizontally.

33. Packaging system according to any one of the claims 27 - 32, wherein the slot-die head is configured to supply moistening fluid in vertical direction to the moistening roller.

34. Packaging system according to claim 26 and in combination with claim 19, wherein:- the moistening fluid supply comprises a spray head directed to the moistening roller, and- the spray head is configured to supply moistening fluid to the moistening roller.

35. Packaging system according to claim 34, wherein the moistening roller comprises an outer moistening surface configured to contact said cover film or base film and the spray head comprises nozzle openings directed to the outer moistening surface.

36. Packaging system according to claim 35, wherein the nozzle openings are aligned and the aligned nozzle openings together extend parallel to the moistening roller rotation axis.

37. Packaging system according to any one of the preceding claims, wherein the packaging system comprises a first moistening device configured to moisten said cover film and a second moistening device configured to moisten said base film.

38. Method for producing pouches comprising a water-soluble base film, a water-soluble cover film, and a fluid or powder, such as a detergent fluid or detergent powder, wherein the method comprises:- moving multiple moulds in a conveying direction along a mould trajectory, such as an endless mould trajectory, wherein each mould has a mould cavity for forming a compartment in said base film,- positioning the base film on the moulds,- positioning parts of said base film in the mould cavities to form the compartments in said base film,- dispensing the fluid or powder in the compartments,- moistening said cover film or base film with a moistening device,- positioning said cover film on said base film and over the fluid or powder in the compartments in order to form a web of pouches holding the fluid or powder between said base film and said cover film,- acquiring first moistening condition data of said cover film or base film at a first location upstream of the moistening device and second moistening condition data of said cover film or base film at a second location downstream of the moistening device with a sensor system being operatively coupled to a control system for controlling the moistening device, and- controlling the moistening of said cover film or base film by the moistening device with the control system on basis of the first moistening condition data and the second moistening condition data.

39. Method according to claim 38, wherein the method comprises the step of performing at least one calculation on the first moistening condition data and the second moistening condition data with the control system.

40. Method according to claim 38, wherein the method comprises the step of generating a control command based on said at least one calculation with the control system.

41. Method according to any one of the claims 38 - 40, wherein the method comprises the steps of:- registering when predetermined sections of said cover film or base film move through the first location and subsequently through the second location using a tracking system, wherein the tracking system is operatively coupled to the control system,- relating the first moistening condition data and the second moistening condition data to the predetermined sections of said cover film or base film.

42. Method according to any one of the claims 38 - 40, wherein the method comprises the steps of:- relating the first moistening condition data and the second moistening condition data of said cover film or base film in real-time with the control system,- generating the control command by performing calculations on basis of the first moistening condition data and the second moistening condition data belonging to different predetermined sections of said cover film or base film.

43. Method according to any one of the claims 38 - 42, wherein the method comprises the steps of:- performing first measurements at the first location of said cover film or base film with a first sensor,- providing first moistening condition parameter values forming the first moistening condition data of said cover film or base film before moistening by the moistening device with the first sensor,- performing second measurements at the second location with a second sensor, and- providing second moistening condition parameter values forming the second moistening condition data of said cover film or base film after moistening by the moistening device with the second sensor.

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