Corrugator belt cleaning assembly, system comprising the same, and method of use of the cleaning assembly

Abstract

A corrugator belt cleaning assembly 30 is provided for cleaning a corrugator belt 12 having a width 24 and used in the production of corrugated card. A cleaning assembly 30 has a first spray-cleaning

Description

The present invention relates to an assembly for cleaning a corrugator belt. The present invention further relates to a corrugator system which includes at least part of a corrugator in addition to the cleaning assembly. The invention also relates to a method of cleaning the corrugator belt. A corrugator is an assembly which forms and glues together sheets of paper to form corrugated cardboard. The corrugated cardboard is transported on one or more corrugator belts, typically moving in an endless loop. A corrugator belt may also be referred to as a blanket. Over time, debris such as pulp and / or adhesive, contaminate the corrugator belt which is typically formed of thick cotton. This contamination process is referred to as the belt “going blind”. Contamination affects moisture retention, heat retention, and airflow through the belt, such that the quality of the product is impacted and unreliable. For instance, contamination may inhibit or prevent the sheets of paper from drying correctly. During cleaning, asymmetric wetting of the belt, such as due to pressure washing one edge of the belt at a time, may also cause asymmetry during drying of the belt, leading to the belt shrinking at different rates across the width of the belt. In turn, asymmetric shrinkage causes the belt to move transversally away from its normal, central position, a phenomenon called “wandering”. To counteract wandering, the position of the belt needs to be automatically adjusted by a process referred to as “auto tracking”. Auto tracking requires additional equipment, such as a camera and equipment to alter the position of the corrugator belt, such as an adjustment roller, which increasing costs and manufacturing complexity. Furthermore, contamination and the effects of overheating reduce the life of the corrugator belt which therefore needs to be replaced more frequently, costing time and money. To address these issues, a contaminated belt is cleaned frequently. The cleaning process involves stopping the belt, then a user standing on the stationary belt, manually scrubbing the surface with a brush and soapy water. However, this presents a number of issues. During cleaning, the belt is out of action, so manufacturing is put on halt for an extended period of time such as days, which leads to a loss of production and thus profit. Cleaning is a laborious process requiring physical strength, which limits the range of workers who can carry out cleaning. Accidents happens and exposure to cleaning chemicals is damaging to a user’s health. Thus, manual cleaning of a corrugator belt is hazardous. Furthermore, the abrasive contact between the brush and the belt damages the belt over time. Cleaning with a brush only removes surface debris, such that the remaining thickness of the belt remains substantially contaminated. The cleaning brushes themselves require cleaning, costing time, effort and money. Brushes wear out and brush bristles may even become embedded in the belt. The present invention seeks to provide a solution to these problems. According to a first aspect of the present invention, there is provided a corrugator belt cleaning assembly for cleaning a corrugator belt having a width, the assembly comprising: a first spray-cleaning head; a second spray-cleaning head; and a positioning means for positioning the first spray-cleaning head and second spray-cleaning head along the width of the corrugator belt, wherein the positioning means defines a first zone in which the first spray-cleaning head is moveable and the positioning means defines a second zone in which the second spray-cleaning head is moveable. The cleaning assembly enables automatic cleaning of a corrugator belt, thereby negating the need for a user to stand on the belt and manually clean the belt. Automatic cleaning reduces labour costs. Cleaning is done by spraying a fluid, such as air or a liquid, at high pressure towards the belt. Automatic cleaning is also faster than manual cleaning. As no user needs to be near the belt, this reduces the risk of accidents or contact with chemicals, which increases safety. Automatic pressure cleaning removes the need for physical contact between the corrugator belt and a solid object such as a brush and / or a person, thereby increasing the lifetime of the corrugator belt. No consumable components such as a brush are required, whereas the brush may otherwise wear out over time. The terms “spraying”, “spray-cleaning”, “pressure cleaning” and “pressure washing” used herein and throughout are used interchangeably. Beneficially, the positioning means may include a centre which in-use aligns with a centreline of the corrugator belt, and wherein the first zone may extend to one side of the centre, and the second zone may extend to the opposite side of the centre. There is limited or even no overlap in the area cleaned by each head such that the time needed by the assembly to clean a set area of corrugator belt may be reduced. Preferably, the first spray-cleaning head and the second spray-cleaning head may be positioned within the first zone and second zone, respectively, so as to in-use sprayclean the corrugator belt symmetrically or substantially symmetrically across at least part of the width of the belt. Even more preferably, a width-wise distance from the first spraycleaning head to the centre may match or substantially match a width-wise distance from the second spray-cleaning head to the centre. The corrugator belt is wetted symmetrically or substantially symmetrically width wise. When drying, the belt dries symmetrically or substantially symmetrically. This reduces or eliminates asymmetric shrinkage and thus, reduces or eliminates wandering of the belt. Furthermore, the positioning means may include a rotary motor. A rotary motor is easy to source. Additionally, the positioning means may include has a drive belt. A drive belt is easy to manufacture or source, and therefore cheap. A drive belt is also light. Additionally or alternatively to a drive belt, the positioning means may include a chain and / or a cylinder. Preferably, the positioning means may further include a roller element. Advantageously, the roller element may be a pulley. The roller element and / or the motor may put the drive belt in motion. Additionally or alternatively, the roller element may be or may include a sprocket, gear, toothed gear, a cylinder, a plurality of any of the above, and any combination thereof. Preferably, the cleaning assembly may further comprise a controller. The cleaning assembly may be controlled automatically, negating the need for manual control and / or oversight by a user. Beneficially, the assembly may have at least one sensor. The sensor may beneficially enable monitoring. For example, the sensor may sense that cleaning is being carried out as expected. The sensor may detect whether the belt is wandering. The sensor can enable the start / stop positions. The sensor can detect a join of the belt. Additionally, the sensor may be a photocell. Furthermore, the or a said sensor may be a camera. Sensing involves visual feedback. This avoids the need for physical contact with the belt, which might otherwise degrade or damage the belt over time. Alternatively or additionally, the or a said sensor may be a pressure sensor. The pressure of the fluid being sprayed from a head may be sensed. Preferably, the cleaning assembly may further comprise a communication module. The communication module enables communication with another device. The device may be the corrugator or at least the belt thereof. The device may be a third party device such as a telecommunications device, such as a computer or phone. Optionally, the assembly may further comprise a safety module including an emergency stop module. The safety of the system is increased. Beneficially, the assembly may further comprise a user interface. The user interface enables a user to provide an input and / or receive an output from the assembly. Additionally, the assembly may further comprise a fluid-regulator. The pressure of the fluid can be altered, for example to apply a higher pressure or a lower pressure to the belt. Optionally, the assembly may further comprise a pre-cleaning element for applying moisture to the belt to loosen debris prior to being spray-cleaned. Debris embedded within the belt are loosened before pressurised fluid is applied. Cleaning efficiency is improved. According to a second aspect of the present invention, there is provided a corrugator system comprising: a corrugator belt cleaning assembly as claimed in any one of the preceding claims, and at least part of a corrugator. Optionally, the corrugator part may be the belt. The cleaning assembly and at least part of the corrugator are provided together. This may enable improved integration between the corrugator and the cleaning assembly, rather than retrofitting the cleaning assembly to an existing corrugator, although this alternative may be envisioned. According to a third aspect of the present invention, there is provided a method of cleaning a corrugator belt of a corrugator, the method comprising the step of: a] spraycleaning a corrugator belt using a first spray-cleaning head and a second spray-cleaning head of a corrugator belt cleaning assembly, the first spray-cleaning head being moveable in a first zone along at least part of the width of the corrugator belt, and the second spray-cleaning head being moveable in a second zone along at least part of the width of the corrugator belt. The belt is pressure cleaned automatically by the assembly, negating the need for any user to carry out cleaning. The safety is increased. Preferably, in step a] the corrugator belt may move past the first spray-cleaning head and / or second spray-cleaning head whilst being spray-cleaned. The belt is already designed to move when used to manufacture cardboard. This pre-existing set-up or ability is simply being re-used for the purpose of cleaning. As no additional parts are required to cause the belt to move for cleaning, logistics are simplified, and costs are reduced. The cleaning assembly may be stationary or substantially stationary in the longitudinal direction. However the alternative arrangement could be envisioned whereby the cleaning assembly is designed to move along the length of the stationary belt. In a further modification, both the cleaning assembly and the belt may be moveable along the longitudinal direction, for example in opposite directions to clean the total surface of the corrugator belt even faster. Beneficially, the corrugator belt may have a join so as to form a closed loop, the method may further comprise a step of b] halting the spray-cleaning for a period of time during which the join of the belt moves past the or each spray-cleaning head or vice versa, so as to not spray the join. The join connects the ends of the belt together, so that the belt forms a closed loop. The join is therefore the weakest point of the belt. Applying pressurised fluid to the join risks damaging the join. A first benefit of halting the cleaning when the join is within the footprint of a head is that this avoids applying pressurised fluid on the join, thereby reducing the risk of breakage and increasing the lifespan of the belt. A second benefit of halting the cleaning when the join is within the footprint of a head is to reduce the risk of the join rusting if formed of metal. Applying a liquid to metal may otherwise cause the join to rust over time, again, increasing the risk of the ends of the belt becoming disconnected. Thirdly, as the join forms a break in the otherwise continuous texture of the belt surface, the join may cause a fault in the product during manufacture. To remedy this, it is common in the industry to apply a layer of short fibres to cover the join, in a process called “flocking”. The layer provides better continuity, and thus reduces or eliminates damage to the product during manufacture. However, pressure washing the short fibres would damage or remove the layer fibres, uncovering the join and thereby damaging the cardboard formed during manufacture. The ability to halt pressure washing at the correct time beneficially reduces or eliminates damage to the flocking. Additionally, the corrugator belt cleaning assembly may further comprise a controller and a sensor adapted to detect the join, the sensor being communicable with the controller, the method may further comprise a step prior to step b] of: the sensor detecting the join, and in response to an input from the sensor, the controller may emit a command to at least one spray-cleaning head such that in step b] the spray-cleaning may be automatically halted in response to the command received from the controller. The join is automatically detected. There is no need to hardcode when the join is beneath a head, such as by the time elapsed and / or the distance travelled by the belt, to know when to temporarily halt spraying. There is also no need for a user to be watching the belt and manually halting the spraying at the relevant time. Automatic detection and temporary halting provides greater flexibility as the system can accommodate any deviations from the expectation, such as due to shrinkage or wandering altering the time when the join is within the footprint of a head, or an unexpected number of joins. As the join is automatically detected, the system can also stop and start spraying with greater accuracy. In contrast, hardcoding the timing when the join is below a head might include providing a time buffer to accommodate for any deviation, leading to a greater area of belt not being cleaned. Beneficially, the corrugator belt cleaning assembly may comprise the or a controller having a communication module communicable with at least part of the corrugator, wherein upon receiving an input from the corrugator via the communication module, the controller may issue a command to the first spray-cleaning head and / or second spraycleaning head. The corrugator system may provide an input to the cleaning assembly via the communication module. This provides greater integration between the corrugator and the cleaning assembly. Advantageously, the command may be a stop command. The cleaning assembly may automatically stop if the corrugator system is not running, or at least if the belt is not moving. This increases cleaning efficiency, and safety. Stopping the cleaning assembly when not required reduces energy and / or cleaning fluid wastage. According to a fourth aspect of the present invention, there is provided a corrugator belt cleaning assembly for cleaning a corrugator belt, the assembly comprising: a first spraycleaning head; and a second spray-cleaning head. Two spray-cleaning heads instead of one spray-cleaning head has a number of advantages. If the heads do not overlap along the width of the belt, the time required to clean a given total surface is reduced relative to a single head cleaning the same total surface. If the heads are positioned or arranged such that the areas of the belt wetted are symmetric or substantially symmetric, this reduces or eliminates asymmetric shrinkage when the belt dries, in turn reducing or eliminating wandering. If the heads partially or fully overlap along the width of the belt during cleaning, even temporarily, this effectively results in two jets of pressurised fluid applied to the same area of belt. If the jets are oriented to hit the same area at the same time at each other, this doubles the force applied to the area, which may result in deeper cleaning. It may not be possible to provide a single head with the equivalent pressure. Different angles of impact may help dislodge different debris, and / or direct the debris off the belt. If the jets hit the same area but staggered in time, this is equivalent to the area experiencing two pulses of jets. The second jet may beneficially remove any debris not dislodged or not fully dislodged by the first jet. The second jet may remove from the belt any loose debris dislodged by the first jet but remaining on the belt. The invention will now be more particularly described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 shows a front cut-away representation of part of an embodiment of a cleaning assembly and part of a corrugator belt of a corrugator in accordance with the second aspect of the present invention, in-use, showing two spray-cleaning heads of the cleaning assembly in a first position, spraying cleaning fluid onto the corrugator belt and moving along the width of the corrugator belt towards a second position; Figure 2 is a top down plan representation of the cleaning assembly and part of the corrugator belt of Figure 1, in-use; Figure 3 illustrates a top down plan representation of the cleaning assembly and part of the corrugator belt of Figure 2, in-use after the two spray-cleaning heads have moved from the first position, indicated as a dashed outline, to a second position; and Figure 4 shows a side cut-away representation of the cleaning assembly and parts of the corrugator of Figure 1, in-use in accordance with the third aspect of the invention. At least part of a corrugator 10 from the prior art is present in Figures 1 to 4. The corrugator 10, also referred to as a corrugator assembly, is used to transport corrugated board. The corrugator 10 includes a corrugator belt 12, a corrugator motor, a roller 14, a corrugator bed 16, and a safety control system, but any of the above may be omitted and / or a plurality of any of the above may be provided. The corrugator belt 12 is an elongate, movable element. The corrugator belt 12 may also be referred to as a blanket. The corrugator belt 12 has a belt body 18, a belt join 20 and, optionally, flocking 22. A corrugator belt 12 may support and / or move corrugated card at different stages of manufacture. For example, a corrugator belt 12 may support and move a layer of pulp drying to form a layer of card. Alternatively, a corrugator belt 12 may carry a dry layer of card onto which is positioned and connected by an adhesive a second layer of card. The corrugator belt 12 preferably forms a closed loop, also referred to as an endless loop. This is preferably achieved by virtue of two opposite ends 18a, 18b of the corrugator belt 12 being connected together by the belt join 20. The belt body 18 may be formed from one or more of a range of possible materials. The material or materials may include: metal, wood, plastics, a natural material, carbon fibre, glass fibre, any other suitable material, and any combination thereof. Plastics includes elastomeric materials, such as rubber or silicone. Metal includes metal alloys. Nature fibres include materials such as cotton, flax, wool, by way of examples only. The belt body 18 may be formed of a solid / monofilament. Alternatively, the belt body 18 may be formed of a plurality of materials, such as a hybrid material. Preferably, the belt body 18 comprises cotton. The belt body 18 has a width 24 and a length. The width 24 is the distance from one side or edge to the opposite side or edge along a width orientation or direction. A longitudinal orientation or direction is perpendicular to the width 24. Preferably, the longitudinal orientation is or is substantially parallel with one or both sides of the belt body 18. The length is measured along the longitudinal direction 26. The total length of the corrugator belt 12 is the distance from one belt end 18a to the opposite belt end 18b measured when the ends 18a, 18b are not joined together. A centreline 28 of the belt body 18 divides the width 24 of the belt body 18 into two, preferably equal, halves. If the corrugator belt 12 suffers from wandering, it is understood that the centreline 28 may move accordingly. As such, the centreline 28 may or may not be a straight line, at least for a portion of corrugator belt 12 extending between two adjacent rollers 14. The join 20 is preferably formed at least in part of metal, but any alternative to metal, such as plastics or carbon fibre, may be envisioned. More preferably, the join 20 includes steel, and more preferably stainless steel. The flocking 22 prevents or inhibits the join 20 damaging the product during manufacture. The flocking 22 may comprise fibres, more preferably short monofilament fibres. The fibres may be adhered to the belt body 18 by adhesive. The corrugator motor in-use causes the corrugator belt 12 to move or travel. The corrugator belt 12 is supported by, and preferably stretched by one or more belt rollers 14. A belt roller 14 may be passively rotatable. Alternatively, a belt roller 14 may be actively rotatable. An actively rotatable belt roller 14 may help drive the movement of the corrugator belt 12 during use. The corrugator bed 16, if provided, is positioned below the corrugator belt 12. The corrugator bed 16 preferably contains and / or emits a heated fluid. The heated fluid may be steam or gas, such as air. This beneficially heats the corrugator belt 12. In the case or air, if any card or pulp is present on the corrugator belt 12, the card or pulp is heated and thus dried. The corrugator bed 16 may be a M / C bed. The safety control system in-use provides control over the corrugator 10. The safety control system may also increase safety, for instance by stopping the corrugator belt 12 during a fault. The safety control system may control the corrugator motor. Referring now to the invention, there is provided a cleaning assembly indicated generally at 30. The cleaning assembly 30 in-use cleans the corrugator belt 12. The cleaning assembly 30 may thus be referred to as a corrugator belt cleaning assembly 30. The cleaning assembly 30 may be retrofittable to the corrugator 10. The cleaning assembly 30 includes positioning means 32, at least one, and preferably a plurality of spray-cleaning heads 34, a controller 36, a sensor 38, and a pre-cleaning element 40, but any of the above may be omitted and / or any of the above may be provided. The positioning means 32 in-use supports the at least one spray-cleaning head. The positioning means 32 may also position the spray-cleaning head 34, if the spray-cleaning head 34 is movable. The head 34 may be pivotably moveable and / or translatably movable. The positioning means 32 has a support element 42, a moveable element 44, a driving element 46, a centre 48, a first zone 50a, and a second zone 50b, but any of the above may be omitted and / or a plurality of any of the above may be provided. Additional zones may be considered depending on the number of heads 34. The support element 42 provides a structure for one or more other elements of the positioning means 32. The support element 42 here includes a beam or beam element 52 and a roller element 54, but any of the above may be omitted and / or a plurality of any of the above may be provided. Optionally, a plurality of beam elements 52 may form a support framework. The support element 42 or at least a beam element 52 thereof extends across at least part of the width of the corrugator belt 12. As shown, the support element 42 spans the width of the corrugator belt 12. The support element 42 may optionally include one or more ground-engaging members 56. The ground-engaging members 56 may be M / C Side frames. A roller element 54 may be freely rotatable, in which case it may be referred to as an idler roller element 54a for clarity. Alternatively or additionally, a roller element 54 may be non-freely rotatable in at least one or both directions of rotation. A roller element 54 may be driven. The roller element 54 may thus be referred to as a driven roller element or a drive roller element 54b. Preferably, the illustrated embodiment includes an idler roller element 54a and a driven roller element 54b. However, any number and / or any combination of types of roller elements may be envisioned. Furthermore, in the preferred embodiment, the, each or at least one roller element 54 may include a pulley. Correspondingly, there is illustrated an idler pulley and a driven pulley in Figures 1 to 3. The moveable element 44 in-use enables movement of the at least one head 34. In the preferred embodiment, the moveable element 44 includes a belt, referred to as a driving belt or a head-moving belt for clarity. Preferably, the driving belt is a timing belt in the present embodiment. However, any additional or alternative moveable element 44 may be envisioned, such as a chain, cable, or lead screw The at least one head 34 is associated with the moveable element 44 so as to be driven thereby. The driving belt is preferably engaged with the support element 42 and more preferably with the roller element or roller elements 54. The roller elements 54 are preferably spaced apart so that the driving belt is taut or substantially taut between them. Optionally, instead of or in addition to the driving belt, the cleaning assembly 30 may include left hand and / or right hand thread, lead screw and optional nut. The thread and lead screw may cooperate to cause movement of a head 34. For example, an elongate screw may extend across width wise. The or each head 34 may include a complementary screw thread engageable with the screw. The support element 42 may provide a track or tracks along which the head or heads are slidably translated. The head or heads may be forced to translate width wise along the track or tracks by engagement of the screw thread engaged with the elongate screw and the elongate screw is rotated. The driving element 46 in-use causes the at least one head 34 to move, directly or indirectly. The driving element 46 here includes a drive motor 46a. The drive motor 46a may be a rotary motor, as illustrated by Arrows 57 in Figure 3. Optionally, the motor may be a servo motor, a stepper motor, an Alternative Current (AC) motor, or any type of suitable motor. In the illustrated embodiment, the driving element 46 is associated with the driven roller element 54b. The driving element 46 may cause the at least one head 34 to move along the width direction continuous or discontinuously. Discontinuous movement may be step-wise, by way of example only. For instance, the head 34 may be immobile or substantially immobile relative to the width of the corrugator belt 12 for a belt revolution or a multiple thereof. The multiple may or may not be a round number. The head 34 may be moved at the start of a new belt revolution before remaining stationary width wise for the duration of the belt revolution or multiple thereof, by way of example only. The centre 48 in-use aligns or is alignable with the centreline 28 of the corrugator belt 12. The first zone 50a is the area in which a first said head 34 operates. The second zone 50b is the area in which a second said head 34 operates. The first zone 50a and second zone 50b are outlined in Figure 2 as dashed areas. If any further heads are provided, additional zones may be considered, incrementally numbered for clarity. A said zone may extend the full width of the corrugator belt 12, however, half, a major extent or a minor extent of the width may be envisioned. Any two zones may overlap partially or fully, whether width-wise and / or length wise. There may be no overlap width-wise and / or length wise between two zones. Preferably, the first zone 50a extends to one side of the centre 48. Preferably, the second zone 50b extends to the opposite side of the centre 48. The first zone 50a and the second zone 50b may overlap at the centre 48. The overlap is at least width wise, but may additionally be length wise. A generalised spray-cleaning head will now be described. It is understood that the description and caveats of the generalised head 34 preferably apply to all or at least a plurality of heads 34 of the present invention. A head 34 in-use sprays a cleaning fluid 58a at a high pressure to clean the corrugator belt 12. In other words, the head 34 emits a pressurised jet of cleaning fluid 58a. The head 34 may thus be referred to as a spray-cleaning head 34. The head 34 includes a nozzle 60, a nozzle support 62, a connection to a source of fluid 64, and a fluid-regulator 66 but any of the above may be omitted and / or a plurality of any of the above may be provided. The nozzle 60 in-use directs the jet of cleaning fluid 58a. The nozzle 60 preferably has a nozzle aperture, but a plurality may be envisioned. The nozzle 60, or at least the nozzle aperture thereof, has a dimension or diameter of preferably between 5 millimetres and 100 mm, more preferably between 10 mm and 50 mm, and even more preferably between 15 mm and 30 mm. In the preferred embodiment, the nozzle 60 or nozzle aperture thereof has a diameter or dimension of 20 mm. The benefit of a smaller dimension, such as 20 mm, is that the fluid can be sufficiently pressurised. However, a small dimension of nozzle 60 means that a footprint 68 on the corrugator belt 12 is small. For example, the footprint 68 of a 20 mm nozzle 60 may have a radius, diameter or dimension of 10 cm or less, more preferably 5 cm or less. Most preferably, the footprint 68 has a radius, diameter or dimension of between 15 mm and 30 mm. The diameter or dimension of the nozzle aperture may be fixed or non-fixed, such as variable. The pressure and volume are preferably balanced to achieve optimum clean. The angle of the nozzle 60 and / or of a nozzle aperture thereof may be variable. The footprint 68 is the area of corrugator belt 12 that is wetted by a head 34 at any time. The footprint 68 of a head 34 may be generally a circle or ellipse as shown in Figure 3. Any alternative shape may be considered, for example the footprint may be a straight line or rectangle, by way of examples only. The sprayed area 70 corresponds to the total area wetted by a head 34, shown as the hatched area within the dot-dot-dashed line. The sprayed area 70 may effectively form a stripe extending along the length of the corrugator belt 12. A small footprint 68 means that only a small area of the corrugator belt 12 can be cleaned at a time, meaning multiple revolutions of the corrugator belt 12 may be required to clean the whole or nearly whole area of the corrugator belt 12. On the other hand, a nozzle dimension which is greater than 20 mm may result in a lower pressure than the desired pressure. The nozzle support 62 supports, positions or holds the nozzle 60. The nozzle support 62 preferably engages with the support element 42, and more preferably the moveable element 44 thereof. The nozzle support 62 may alter the orientation, angle, or movement of the nozzle 60. For example, the nozzle support 62 may angle the nozzle 60 relative to a support element 42 and / or relative to a vertical direction. The angle may be between 1° and 60°, more preferably between 10° and 50° and more preferably between 15° and 45°. The nozzle support 62 may cause the nozzle 60 to spray in a pattern, such as a linear pattern and / or a rotary pattern. A rotary pattern may beneficially have a greater footprint 68. The connection to a source of fluid 64 enables the nozzle 60 to be connected to the source of fluid 71, such as tubing or conduit. The cleaning assembly 30 may have a fluid flow path along which the cleaning fluid 58a flows. The fluid flow path is preferably defined by the or at least one nozzle 60, the connection to a source of fluid 64, and optionally the source of fluid 71. As there are preferably a plurality of nozzles 60, the fluid flow path may fork or split into a plurality of sub-paths, each sub-path extending through a said nozzle 60. Optionally, the source of fluid 71 may comprise any or any combination of: a pump; the fluid mains, such as the water mains; a container; a plurality of any of the above; and any combination thereof. The pump may enable the fluid to be pressurised if not already pressurised or the pressure to be regulated, such as increased. Thus, the pump may regulate the fluid pressure. Optionally, the pressure may be infinitely or continuously variable. However, the pressure may have discrete ranges or discrete settings of pressure. For example, the pump may have an “extra high” pressure setting, and / or a “low” high-pressure setting, in addition to a “normal” high pressure. Correspondingly, the pump may have one or more switches. The extra-high pressure setting may beneficially be used to clear a blockage, such as along the fluid flow path. Preferably, when the assembly 30 is operating at the “extra-high” pressure setting, the cleaning fluid is pressurised, preferably by the pump, to be at a pressure of at least 190 bar or 1.9 x107 Pascal. Preferably, the pressure is at most 200 bar or 2.0 x107 Pascal. If there are a plurality of nozzles 60, the pressure is divided by the number of nozzles. Here, there are preferably two nozzles 60 such that the pressure in each nozzle 60 is between 95 bar and 100 bar, equivalent to between 9.5 x106 Pascal and 1 x107 Pascal when the assembly 30 is operating at the “extra-high” pressure setting, The ’’normal” high pressure is preferably greater than 120 bar or 1.2 x107 Pascal. The ’’normal” high pressure is preferably less than 190 bar or 1,9x107 Pascal. More preferably the “normal” high pressure is more preferably between 140 bar and 180 bar, corresponding to between 1.4 x107 Pascal and 1.8 x107 Pascal. Most preferably, the “normal” high pressure is 160 bar or 1.6 x107 Pascal. This beneficially is the optimum pressure. Once again, if there is a plurality of nozzles, the total pressure of the fluid in may be divided by the number of nozzles. The “low” high-pressure may be used during cleaning fluid 58a starvation whilst still pressurising the cleaning fluid 58a so as to effectively clean the corrugator belt 12. The “low” high-pressure is preferably still higher than fluid pressure in water mains. The “low” high-pressure is preferably at most 120 bar or 1.2 x107 Pascal. Once again, if there is a plurality of nozzles, the total pressure may be divided by the number of nozzles. Optionally, if there is a fluid shortage such that the pressure drops to below 120 bar or 1.2 x107 Pascal, the assembly 30 and more preferably the fluid regulator 66 may automatically stop or shut off the flow of fluid. The fluid-regulator 66 in-use regulates the cleaning fluid 58a. The fluid-regulator 66 preferably includes a valve but a plurality may be provided. The valve may reduce the pressure of the cleaning fluid 58a exiting the nozzle 60. The valve may even stop any flow of fluid from the nozzle 60. Thus, the valve may be an on / off valve. The valve is preferably a solenoid valve. A solenoid valve may beneficially be controlled electronically. In the preferred embodiment, each head 34 has a fluidregulator 66. However, it could easily be considered that a plurality of heads may share a communal fluid-regulator and / or a valve thereof. The fluid-regulator 66 may additionally or alternatively be associated with the pump. Examples of a suitable cleaning fluid 58a include: steam, condensate steam, water, a gas, a chemical washing product such as detergent, any other suitable product, or any combination thereof. The gas may be air. As such, a spray-cleaning head 34 may spray pressurised air. Optionally, the head 34 may include a dosing device. The dosing device may dose or auto dose a chemical into the cleaning fluid. The dosing device may be provided anywhere along the fluid flow path. Preferably, the dosing device is associated with the pump. In the shown embodiment, there are two heads, which may be referred to as a first head 34a and second head 34b for clarity. Figure 3 illustrates a first position FP of the heads 34 in a dashed outline and a second position SP in solid lines. Preferably, the first head 34 remains in the first zone 50a and the second head 34 remains in the second zone 50b. Even more preferably, the first head 34 and the second head 34 may be equidistant or substantially equidistant from the centre 48. In other words, the distance between the corrugator belt edge and the first head 34 matches or substantially matches the distance between the opposite corrugator belt edge and the second head 34, but this is not strictly necessary. In other words, the heads 34, and preferably their respective footprints are symmetrically or substantially symmetrically distributed along the width 24. If the nozzles 60 are angled, the footprints of the respective heads may be symmetric or substantially symmetric instead, without the heads necessarily being symmetrically distributed along the width 24. If the zones overlap with the centre 48 width wise at least,, the heads 34 may find themselves aligned longitudinally, as in the second position. The controller 36, also referred to as a control panel, in-use enables the cleaning assembly 30 to be controlled automatically. The electrical components are preferably Ingress-Protection (IP) rated. In other words, the electrical components are protected from fluid ingress. The controller 36 is preferably mechanically secured. Furthermore, the controller 36 may be password protected. The controller 36 includes a housing 72, a logic module 74, a memory module 76, a clock element 78, and a communication module 80, a safety module 82 including an emergency stop module, a user interface 84, but any of the above may be omitted and / or a plurality of any of the above may be provided. The housing 72 may provide a protective shell or barrier to at least part of one or more of the other components of the controller 36. The housing 72 may be formed at least in part of metal. Steel and more preferably stainless steel are examples of a suitable metal. The housing 72 may optionally comprise an isolator. The isolator may beneficially help to isolate mechanically and / or electrically any electronics of the controller 36 from the rest of the cleaning assembly, such as for maintenance or in case of an electrical fault. The logic module 74 in-use processes inputs and / or emits outputs. An example of an output is a software command. An input may be any or all of: data from a sensor, a user input, an input from the corrugator 10, a software command, a set of instructions stored in the memory module 76, data from the clock element 78, any other suitable input, and any combination thereof. An example of a user input may be a password, for instance if the controller 36 is protected by a password. Any other suitable example of an input and / or output may be considered. The logic module 74 preferably includes a Programmable Logic Controller or a Printed Circuit Board. The logic module 74 is preferably communicable with at least one and preferably all components of the controller 36. The memory module 76 in-use stores data. The data may relate to the movement and / or positioning of a head 34, for example width wise and / or in relation to a respective zone. The data may relate to the timing of spraying by a head 34. The data may relate to variables and / or thresholds. By way of examples, the data may relate to the number, type, dimensions and / or footprint of a head 34. The data may relate to pressure settings, nozzle configurations, spray patterns. The data may relate to depth, intensity of clean, and / or speed of cleaning. The data may relate to information about the corrugator 10 and / or corrugator belt 12 thereof. The data may relate to a threshold, for example of a temperature, a pressure, a thickness of belt, a dirtiness of belt. Any relevant data may be stored in the memory module 76. Optionally, the data may include one or more cleaning programmes, such as one or more sets of software instructions. For example, the cleaning programmes may be different spraying patterns, such as manual cleaning; edge clean and automatic function; automatic for full width clean; manual for localised cleaning; edge clean for a preset edge clean, and a double clean. The clock element 78 in-use measures time. The measurement may be an absolute clock element 78, in other words, providing an absolute time and / or date stamp. Alternatively or additionally, the clock element 78 may measure a relative time period. In this case, the clock element 78 may be a timer or a countdown clock. The clock element 78 may provide an output to the logic module 74. For example, the clock element 78 may measure time since the corrugator belt 12 or part thereof was last cleaned. The fluid-regulator 66 in-use regulates or alters the pressure of the fluid. The fluidregulator 66 may set or rectify the pressure of the cleaning fluid 58a. Optionally, the cleaning assembly 30 may have a plurality of pressure settings, for instance for different use cases. For instance, the cleaning assembly 30 may have one or more of: a “high” pressure setting, a “normal” high pressure setting, and a “low” high pressure setting. The “high” pressure setting may increase the pressure to remove any blockages along the fluid flow path of the cleaning assembly 30. The “normal” high pressure setting may be used to pressurise the cleaning fluid 58a to a pressure suitable for cleaning the corrugator belt 12 by pressure washing. The “low” high pressure setting may be used to pressurise the cleaning fluid 58a to a pressure suitable for cleaning the corrugator belt 12 by pressure washing when there is a restriction or shortage of cleaning fluid 58a, for example when water is scarce. The communication module 80 in-use enables integration of or communication between parts of the cleaning assembly 30. Additionally or alternatively, the communication module 80 in-use enables integration of or communication between the cleaning assembly 30 and a third party device 86. The third party device 86 may be the corrugator 10 and / or any part thereof, such as the corrugator belt 12. Additionally or alternatively, the third party device 86 may be a third party computing device, such as a computer or phone. The phone may be a smartphone. The integration or communication may be mechanical such as via a force transmission system. A force transmission system may include a cog or gear system, a motor shaft, a drive belt, by way of examples. The integration or communication may be electrical, such as via a wire. Integration or communication may be wireless, such as via Bluetooth, internet, Wi-Fi, or Near-Far Communication (NFC) by way of examples. Beneficially, integration or communication between the cleaning assembly 30 and the corrugator 10 may increase safety and / or efficiency. For example, a run signal can be provided by the corrugator 10, such as an electrical signal from an encoder associated with the corrugator motor or a motor wheel thereof, to the cleaning assembly 30. If the signal is that the corrugator belt 12 is not moving, the cleaning assembly 30 may be prevented from cleaning, to avoid one or more of: cleaning fluid wastage, electricity wastage, unnecessary wear of the cleaning assembly 30, and damage to the corrugator belt 12 from pressure washing the same area due to lack of relative movement between the corrugator belt 12 and the cleaning assembly 30. Integration or communication with a third party device 86 enables a third party, such as a user, to provide an input and / or receive an output. The third party device 86 may include one or more switches. Thus, the communication module 80 may provide remote operator control switches, such as on / off, manual / auto, edge clean, or home position. The user interface 84 in-use enables a user to provide an input and / or receive an output. The input may be a command. The output may be an indication of a machine condition, such as “ready to run”, or “faulty”. The user interface 84 may include at least one and preferably a plurality of light-emitting elements, such as an LED. For example, a lightemitting element may be emitting light, to indicate that the cleaning assembly 30 is cleaning the corrugator belt 12. Optionally, the user interface 84 may include any or all of: a screen, a keyboard, a speaker, a microphone, a button, a toggle, a handle, any other suitable element for providing input and / or an output, and any combination thereof. The safety module 82 in-use increases the safety of the cleaning assembly 30. The safety module 82 may have an emergency stop element. The emergency stop element may be a shut-down button, by way of example. The emergency stop element may be manual and / or digital. The emergency stop element may be local and / or independent, such as located remotely. The emergency stop element may be automatic. For example, the emergency stop element may automatically shut-down the cleaning assembly 30 or any part thereof in case of emergency, such as during a fault. The sensor 38 in-use measures a parameter. The sensor 38 may provide data to the logic module 74. Thus, the sensor 38 may directly or indirectly detect debris or foreign bodies in or on the corrugator belt 12. The sensor 38 may be any of: a photocell 88, a linear position sensor 89, a camera 90, a pressure sensor 91, or any other desirable sensor. There may be a plurality of sensors 38. A said sensor 38 may be the same type as a further said sensor 38. Additionally or alternatively, a said sensor 38 may be a different type as a further said sensor 38. In the illustrated embodiment, the cleaning assembly 30 includes one or more of each of the above types of sensor 38. The sensor 38 may be adapted or configured to detect the join 20. The sensor 38 is preferably communicable with the controller 36 and more preferably the logic module 74 thereof. The photocell 88, also referred to as a photoresistor, in-use changes its resistance when detecting light. For instance, the photocell 88 may be positioned to receive light reflected from the corrugator belt 12. The photocell 88 may be positioned to overlie and / or be angled towards the corrugator belt 12. Optionally, the photocell 88 may even be able to emit light to the corrugator belt 12 which is subsequently reflected back to the photocell 88. The amount and / or type of light received by the photocell 88 may be indicative of a property of the corrugator belt 12, such as the cleanliness of the corrugator belt 12. The photocell 88 may detect a thickness of the belt. For example, a monitoring linear photocell 88 may measure a distance from the photocell 88 to the surface of the corrugator belt 12. If the distance is greater than a threshold distance, this may indicate that the corrugator belt 12 may be worn out and in need of replacement. In other words, the photocell 88 may be able to monitor the calliper or thickness of the corrugator belt 12. Optionally, the photocell 88 may be able to monitor the calliper across all the width of the corrugator belt 12, but across a majority or even a minority of the width may be envisioned. The photocell 88 may be able to detect the belt join 20, for example, the different geometry and / or material of the belt join 20 may reflect light differently to the rest of the corrugator belt 12, causing a change in resistance of the photocell 88. The photocell 88 may be able to detect the positional limits for one or a plurality of heads 34. The linear position sensor 89 in-use measures a distance travelled by the corrugator belt 12, in other words, the cumulative distance travelled by any section of corrugator belt 12 during use. Linear meterage may be beneficial to determine when the corrugator belt 12 needs to be cleaned. Optionally, the controller 36 and more preferably the memory module 76 thereof may store a reference threshold value for travel distance. The camera 90 in-use captures an image. The camera 90 can be used to image the corrugator belt 12 for example to detect the join, and / or monitor belt. The camera 90 may be able to monitor the contamination condition and / or whether the corrugator belt 12 is moving. The camera 90 may also enable auto tracking, if wanted. However, if the belt is wetted symmetrically or substantially symmetrically such that wandering of the corrugator belt 12 is eliminated. The camera 90 may be able to send data, such as an image or video to the logic module 74. Optionally the memory module 76 may comprise data relating to a reference image or reference video. The controller 36 and / or logic module 74 thereof may be able to compare the image or video from the camera 90 to the reference image or video stored by the memory module 76. The logic module 74 may take a decision and provide an output. Thus, the controller 36 and / or camera 90 thereof may determine a threshold debris, for instance via the colour, thickness, porosity, moisture content or other metric, and determine whether cleaning is required. Optionally, there may be a calibration against a new belt, or a physical sample of a new belt, or corresponding reference values. The pressure sensor 91 in-use measures a pressure. More preferably, the pressure sensor 91 measures a pressure of the cleaning fluid 58a in the cleaning assembly 30 or at least a head 34 thereof. If a pre-cleaning element 40 is provided, the pressure sensor 91 may be able to measure a pressure of a pre-cleaning fluid 58b. The pressure sensor 91 may be able to emit a measured pressure value to the logic module 74. Optionally, the controller 36 or at least the memory module 76 thereof may store one or more reference values of pressure, such as one or more threshold pressures, and optionally an acceptable tolerance. Optionally, the controller 36 or at least the logic module 74 may be able to detect if measured pressures deviates from the reference pressure, such as beyond an acceptable tolerance. The controller 36 or at least the logic module 74 may be able to produce an output, such as to one or more of: the fluid-regulator 66, a spraycleaning head 34, any other part of the controller 36, the communication module 80, the safety module 82, and the user interface 84. For example, if the pressure sensor 91 detects a lower pressure than expected, this may be indicative of a leak. The pre-cleaning element 40, also referred to as a pre-cleaning bar, in-use moistens the corrugator belt 12, which is typically dry prior to cleaning. Moistening by the pre-cleaning element 40 softens debris prior to pressure washing by a spray-cleaning head 34, thereby increasing the efficiency ofcleaning by the spray-cleaning head 34. Pre-cleaning involves the application of a pre-cleaning fluid 58b, which may be the same or different to the cleaning fluid 58a sprayed by a spray-cleaning head 34. In the preferred embodiment, the pre-cleaning fluid 58b includes water and / or a chemical. The chemical is preferably shampoo and more preferably pH neutral shampoo, but any alternative suitable chemical may be envisioned. The pre-cleaning fluid 58b may be any temperature. Preferably, at least when the pre-cleaning fluid 58b is applied to the corrugator belt 12, the pre-cleaning fluid 58b may be less than 37°C, and more preferably, is less than 30°C. The pre-cleaning fluid 58b may be at room temperature, such as around 25°C. The pre-cleaning fluid 58b may be cold water, such as around 15°C. Thus, the pre-cleaning fluid 58b is not heated before application, although this alternative may be envisioned. Beneficially, the corrugator bed 16 increases the temperature of the pre-cleaning fluid 58b, which may beneficially soften or further soften the debris. An additional benefit is that an existing part of the corrugator 10, which is the corrugator bed 16, is re-used to enable or enhance the cleaning of the corrugator belt 12. Re-use of an existing part to heat the pre-cleaning fluid and / or cleaning fluid reduces complexity, uses less resources and space, simplifies installation, and may reduce running costs. Whilst preferably not part of the cleaning assembly 30 in the present invention, the source of fluid may be the water mains, and / or a compressor, such as an air compressor. In the case of the source of fluid being the water mains, as previously mentioned, one or more chemicals may be added to the water, such as by the dosing device, to provide the cleaning fluid and / or pre-cleaning fluid. In an alternative embodiment, the cleaning assembly may include the source of fluid. Beneficially, inclusion of the source of fluid within the cleaning assembly may result in the cleaning assembly being portable, by virtue of not requiring a connection to water mains. For example, the source of fluid may be in the form of a tank of fluid. In-use, the user obtains a corrugator system including the cleaning assembly 30 and at least part of a corrugator 10. If the corrugator 10 or part thereof is already installed, the user may only need the cleaning assembly 30. The cleaning assembly 30 may be retrofitted to the corrugator 10. The cleaning assembly 30 may be removably installed. In otherwords, the cleaning assembly 30 may remain temporarily in position, such as for the duration of the cleaning only, before being removed. Preferably however, once installed, the cleaning assembly 30 remains in position throughout, even when not cleaning the belt corrugator 10. The cleaning assembly 30 may be a permanent fixture. The cleaning assembly 30 may be integrated with the corrugator 10 and / or the safety control system thereof. To install the cleaning assembly 30, the following steps are carried out, not necessarily in the following order. The positioning means 32 is installed. In the illustrated embodiment, this involves positioning the or each beam element 52 to extend at least in part along the width of the corrugator belt 12. The ground-engaging members 56, if any, are made to engage with the ground. The driving element 46 is installed. The or each roller element 54 is installed. In the case of a driven roller element 54, the roller element 54 is engaged or associated with the driving element 46, so as to be driven thereby. The or each moveable element 44 is installed. In the present case, the moveable element 44 is a driving belt. The driving belt is positioned around the one or more roller elements 54. Preferably, the roller elements 54 are positioned relative to each other to tension the driving belt. The driving belt may therefore be taut or substantially taut. The or each spray-cleaning head 34 is installed. In the illustrated embodiment, the or a said nozzle support 62 is connected to the or a said moveable element 44 and / or the positioning means 32. The or each nozzle 60 is connected to the source of fluid 71 by the connection to a source of fluid 64. Optionally, a same connection to a source of fluid 64 may be used for a plurality of heads 34. It may be envisioned that each head may have a separate connection to the or a said source of fluid. The fluid-regulator 66 is installed so as to regulate the pressure. If provided and / or desired, the pre-cleaning element 40 is installed. The controller 36 is installed. The controller 36 is configured, adapted, or arranged to be communicable with any other part of the cleaning assembly 30 and / or the corrugator 10 or part thereof. Once in an assembled condition, the cleaning assembly 30 is ready for use to clean the corrugator belt 12 when required. To disassemble the cleaning assembly 30, any or all the reverse steps to the above may be carried out, not necessarily in the reverse order. The corrugator 10 is used to manufacture card or cardboard. During manufacture, debris, such as adhesive and / or paper fibres, may accumulate on and / or embed themselves into the corrugator belt 12. Debris alter the porosity, thereby preventing or inhibiting steam moving through the corrugator belt 12 and / or retaining heat. Debris may even alter the surface geometry of the corrugator belt 12. In all cases, the quality of the resulting product is reduced. Determining when the corrugator belt 12 needs to be cleaned may be carried out in a number of different ways. A user may input a command for the cleaning assembly to carry out cleaning. Alternatively, the cleaning assembly 30 and more preferably the controller 36 may determine automatically that the corrugator belt 12 needs to be cleaned, by one or more of the following methods. If a camera 90 is provided, the camera may capture an image of the corrugator belt 12 and transmit the image or data corresponding thereto to the logic module 74. If a photocell 88 is provided, one or more measurements of the resistance may be provided to the logic module 74. If provided, the linear position sensor 89 may measure the distance travelled by the corrugator belt 12. If provided, the clock element 78 may provide an indication of time to the logic module 74, such as the date and time of the last clean, or how long has elapsed since the last clean. In each case, the logic module 74 may determine, for example by comparison with a reference and / or threshold value, whether cleaning is required. Optionally, the logic module 74 may use more than one of the above methods. Multiple methods may increase the certainty that a clean is required and reduce a false positive determination. Optionally, parameters of the cleaning may be varied according to the condition of the corrugator belt 12, such as length, duration, pressure, or location. The logic module 74 may be able to automatically determine the required parameters of the cleaning, to carry out the most suitable type of cleaning. To clean the corrugator belt 12, the following steps are carried out. Optionally, if a pre-cleaning element 40 is provided, the pre-cleaning element 40 may apply pre-cleaning fluid 58b to the belt 12. At least one, and preferably the plurality of spraying-cleaning heads 34 are positioned above the corrugator belt 12. This may require moving one or more heads 34 to a desired location and / or orientation. To move one or more heads 34, the moveable element 44 is driven by the driving element 46. In the illustrated embodiment, the drive motor 46a drives the, each or at least one driven roller element 54 to rotate. This causes the driving belt to move around the roller elements 54. The, each or at least one head 34 moves with the driving belt. Beneficially, the driving belt may move a plurality of heads 34 simultaneously and by the same amount. A driving belt is therefore a simple arrangement. In an alternative embodiment, each head may be controlled independently. Preferably, the heads 34 are positioned relative to the driving belt and / or positioning means 32 so as to be or be moved to their respective zones. Furthermore, the heads 34 are positioned relative the driving belt and / or positioning means 32 so as to be on either side of the centre 48 of the positioning means 32. Positioning on either side of the centre 48 may preferably minimise or avoid any overlap in the sprayed footprint of each nozzle 60. Thus, for a total given surface area of corrugator belt 12 to be cleaned, the time required to clean the corrugator belt 12 is divided by the number of heads 34, at least compared to a single head 34. Even more preferably, the heads 34 are positioned relative to the relative the driving belt and / or positioning means 32 so as to spray the corrugator belt 12 symmetrically or substantially symmetrically. In the illustrated embodiment, this symmetry or substantial symmetry is enabled by virtue of the driving belt extending around a pulley and a head 34 being provided on either side of the pulley, associated with a portion of the driving belt which is going in the opposite direction of movement relative to the other head. Thus, when one head 34 moves in one direction width wise, the other head 34 moves in the other direction width wise. This is indicated as Arrows A and B in Figures 1 and 2. It is understood that the heads 34 may thus be staggered length wise, as well as width-wise. However, symmetry may be envisioned by other mechanisms. For example, the nozzles may be angled so as to direct their jet of cleaning fluid to pressure clean an area of the corrugator belt. The footprint of a head may therefore not necessarily lie directly below the head. The footprints may be symmetric or substantially symmetric along the width of the corrugator belt, independently of whether the heads themselves are positioned symmetrically or substantially symmetric along the width of the corrugator belt and / or positioning means. The heads may even be fixed or non-movable width wise. In an alternative embodiment, each head may be individually controlled. In any case, the corrugator belt 12 being cleaned symmetrically or substantially symmetrically beneficially prevents or inhibits asymmetric shrinkage when drying. Wandering is reduced or eliminated. In the preferred embodiment, the cleaning assembly 30 is or is substantially fixed in position relative to the ground and / or corrugator 10. The corrugator belt 12 moves past the cleaning assembly 30. However, it may be envisioned that the corrugator belt may be stationary and the cleaning assembly may move along the length of the corrugator belt. In a further modification, both the cleaning assembly and the corrugator belt may move lengthwise. As each head 34 may only spray a fraction of the width at any given time, it may be necessary for the corrugator belt 12 to do more than one belt revolution. When a full revolution has been completed, optionally tracked by the controller 36, the head or heads 34 may be moved to spray another strip of corrugator belt 12. Thus, the head or heads 34 may alternate between moving and being stationary. Alternative patterns may be envisioned, such as the heads 34 moving continuously width wise. The heads may start from the first position FP and move towards the second position SP, however, the reverse embodiment may be envisioned. In the above use scenario, the whole area of the corrugator belt 12 is cleaned. However, it may not necessarily be desired that the whole area of the corrugator belt 12 be cleaned. For example, the heads may together wash only part of the width of the corrugator belt. This may be desirable, for example to clean only the edges of the corrugator belt. The user and / or controller 36 may select an alternative cleaning programme in such case. As the corrugator belt 12 has a join 20, optionally covered in flocking, it is desirable to avoid spraying the join 20. The controller 36 may halt the spray-cleaning for a period of time during which the join 20 of the corrugator belt 12 moves past the or each spraycleaning head or vice versa. Beneficially, the result is that the join 20 is not sprayed. The controller 36 may emit a command to at least one spray-cleaning head 34 and / or the fluid-regulator 66 thereof. Thus, if the fluid-regulator 66 is a valve and more preferably a solenoid valve, the valve is actuated to be in a closed condition for the period during which the spraying is to be halted. To resume spraying, the controller 36 may actuate the fluid-regulator 66 and more preferably the valve into an open condition. The cleaning assembly 30 may determine when the spray-cleaning needs to be halted by one or more of a number of ways. If the clock element 78 is provided, the controller 36 may work out when to halt spraying based on timing, such as how long has elapsed since the join 20 overlapped with the footprint 68 of at least one head 34. If the cleaning assembly 30 includes a sensor 38, the sensor 38 may detect the join 20, and emit data to the controller 36. In response to an input from the sensor 38, the controller 36 may emit a command to at least one spray-cleaning head 34 and / or the fluid-regulator 66 thereof. This enables the automatic halting of the spray-cleaning in response to the command received from the controller 36. Preferably, the cleaning assembly 30 includes a sensor 38 and a clock element 78. The sensor 38 may be angled towards the corrugator belt 12 and able to detect the presence of the belt join 20. The clock element 78 in conjunction with the logic module 74 may calculate a period of time during which the spraying needs to be halted to avoid any overlap between the footprint 68 of the head or heads 34 and the belt join 20, referred to as the no-spray period 92a, for clarity. Optionally, if a pre-cleaning element 40 is provided, a similar no-spray period may be provided to avoid the pre-cleaning element 40 applying pre-cleaning fluid 58b to the join 20. Preferably, the no-spray period 92a lasts 1 minute or less, but more than a minute may be envisioned. More preferably, the no-spray period 92a lasts 30 seconds or less, even more preferably 10 seconds or less, and even more preferably yet 1 second or less. In the illustrated embodiment, the no-spray period 92a lasts 0.4 second. If the cleaning fluid or pre-cleaning fluid is water, the no-spray period 92a may be referred to as a “water off period”. Preferably, the sensor 38 may be positioned spaced-apart from at least one head 34. The clock element 78 in conjunction with the controller 36 may therefore also calculate a delay period 92b until the join 20 reaches the head or heads 34. Calculation of the delay period 92b may depend on a number of factors such as the distance between the sensor and the head 34, and the speed of travel of the corrugator belt 12. A user may provide a command to halt the spraying, such as via the controller 36. In all cases, the or each head 34 stops spray-cleaning the corrugator belt 12 during the no-spray period or periods 92a. Preferably, the communication module 80 enables communication of the cleaning assembly 30 with at least part of the corrugator 10 for integration and safety. Upon receiving an input from the corrugator 10, the controller 36 may issue a command to the first spray-cleaning head and / or second spray-cleaning head 34. The input may be that the corrugator 10 or at least the corrugator belt 12 thereof is not moving. The command may be a stop command. Thus, there may be automatic integration between the corrugator 10 and the cleaning assembly 30. Any of the features and caveats that apply to one of the embodiments or features may easily be provided or applicable to any of the other embodiments or features. Whilst a preferred shape may have been specified for any of the above-described features, any alternative shape may be envisioned in any of or lateral cross-section, longitudinal cross-section, in side view, or in plan view. The shape may be any or any combination of: curved, part curved, non-curved, linear, part linear, non-linear, a broken line, any polygon, whether regular or irregular, having one or more chamfered and / or rounded corners, a triangle, a quadrilateral, such as a square, a rectangle, a trapezium, a trapezoid, a pentagon, a hexagon, a heptagon, an octagon, or any other polygon, a cross, an ellipse, a circle, part circular, an oval, or any abstract shape. It is therefore possible to provide a cleaning assembly which can carry out automatic cleaning of a corrugator belt by virtue of having at least one spray-cleaning head. This reduces or eliminates the need for manual cleaning, thereby reducing labour costs, reducing time during which the corrugator belt is unavailable, and increases safety. Automated cleaning is more systematic than manual cleaning, such that the risk of missing part of the corrugator belt when cleaning is reduced. Cleaning can happen during the night to further reduce the impact of downtime on manufacture. The provision of a plurality of spray-cleaning heads is beneficial as it improves the effectiveness of cleaning if there is overlap in the footprints of the heads. In the absence of overlap in footprints, the time required to pressure clean a given area of corrugator belt is divided by the number of heads. Thus, a plurality of heads greatly increases the speed of cleaning, and further reduces the duration of time during which the corrugator belt is not available, compared to a single spray-cleaning head. It is further possible to provide a cleaning assembly in which the spray-cleaning heads are movable to be better positioned relative to the corrugator belt. This benefit is enabled by virtue of a positioning means. Furthermore, it is possible to provide a corrugator system which includes a cleaning assembly and at least part of a corrugator. The corrugator and the cleaning assembly are better integrated with other if provided together. It is further possible to provide a method of cleaning a corrugator belt of a corrugator automatically, via the use of at least one and preferably a plurality of pressure-washing heads. Automation reduces or negates the need for a user to clean the corrugator belt, which increases safety for the user, reduces labour costs and time spent cleaning such that the corrugator belt can be available for use faster. The words ‘comprises / comprising’ and the words ‘having / including’ when used herein with reference to the present invention are used to specify the presence of stated features, integers, steps or components, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination. The embodiments described above are provided by way of examples only, and various other modifications will be apparent to persons skilled in the field without departing from the scope of the invention as defined herein.

Claims

1. A corrugator belt cleaning assembly for cleaning a corrugator belt having a width, the assembly comprising:a first spray-cleaning head;a second spray-cleaning head; anda positioning means for positioning the first spray-cleaning head and second spray-cleaning head along the width of the corrugator belt, wherein the positioning means defines a first zone in which the first spraycleaning head is moveable andthe positioning means defines a second zone in which the second spraycleaning head is moveable.

2. A corrugator belt cleaning assembly as claimed in claim 1, wherein the positioning means includes a centre which in-use aligns with a centreline of the corrugator belt, and wherein the first zone extends to one side of the centre, and the second zone extends to the opposite side of the centre.

3. A corrugator belt cleaning assembly as claimed in claim 1 or claim 2, wherein the first spray-cleaning head and the second spray-cleaning head are positioned within the first zone and second zone, respectively, so as to in-use spray-clean the corrugator belt symmetrically or substantially symmetrically across at least part of the width of the belt.

4. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, wherein the positioning means includes a rotary motor.

5. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, wherein the positioning means includes has a drive belt.

6. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, wherein the positioning means further includes a roller element.

7. A corrugator belt cleaning assembly as claimed in claim 6, wherein the roller element is a pulley.

8. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a controller.

9. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further having at least one sensor.

10. A corrugator belt cleaning assembly as claimed in claim 9, wherein the sensor is a photocell.

11. A corrugator belt cleaning assembly as claimed in claim 9 or claim 10, wherein the or a said sensor is a camera.

12. A corrugator belt cleaning assembly as claimed in any one of claims 9 to 11, wherein the or a said sensor is a pressure sensor.

13. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a communication module.

14. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a safety module including an emergency stop module.

15. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a user interface.

16. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a fluid-regulator.

17. A corrugator belt cleaning assembly as claimed in any one of the preceding claims, further comprising a pre-cleaning element for applying moisture to the belt to loosen debris prior to being spray-cleaned.

18. A corrugator system comprising:a corrugator belt cleaning assembly as claimed in any one of the preceding claims, andat least part of a corrugator.

19. A method of cleaning a corrugator belt of a corrugator, the method comprising the step of: a] spray-cleaning a corrugator belt using a first spray-cleaning head and a second spray-cleaning head of a corrugator belt cleaning assembly, the first spray-cleaning head being moveable in a first zone along at least part of the width of the corrugator belt, and the second spray-cleaning head being moveable in a second zone along at least part of the width of the corrugator belt.

20. A method as claimed in claim 19, wherein in step a] the corrugator belt moves past the first spray-cleaning head and / or second spray-cleaning head whilst being spray-cleaned.

21. A method as claimed in claim 19 or in claim 20, wherein the corrugator belt has a join so as to form a closed loop, the method further comprising a step of b] halting the spray-cleaning for a period of time during which the join of the belt moves past the or each spray-cleaning head or vice versa, so as to not spray the join.

22. A method as claimed in claim 21, wherein the corrugator belt cleaning assembly further comprises a controller and a sensor adapted to detect the join, the sensor being communicable with the controller, the method further comprising a step prior to step b] of: the sensor detecting the join, and in response to an input from the sensor, the controller emitting a command to at least one spray-cleaning head such that in step b] the spray-cleaning is automatically halted in response to the command received from the controller.

23. A method as claimed in any one of claims 19 to 22, wherein the corrugator belt cleaning assembly comprises the ora controller having a communication module communicable with at least part of the corrugator, wherein upon receiving an input from the corrugator via the communication module, the controller issues a command to the first spray-cleaning head and / or second spray-cleaning head.

24. A method as claimed in claim 23, wherein the command is a stop command.

25. A corrugator belt cleaning assembly for cleaning a corrugator belt, the assembly comprising:a first spray-cleaning head; anda second spray-cleaning head.

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