MULTI-ROW COAXIAL BLOW FUSION SYSTEM
Patent Information
- Authority / Receiving Office
- MX · MX
- Patent Type
- Patents
- Current Assignee / Owner
- FRATELLI CECCATO MILANO SRL
- Filing Date
- 2022-06-17
- Publication Date
- 2026-05-19
AI Technical Summary
Multi-row coaxial meltblown systems face issues with assembly and disassembly complexity due to the need for precise alignment of multiple plates, leading to potential tube deformations and breakages, especially at high processing temperatures, and are not easily adaptable for producing different types of nonwoven fabrics.
A multi-row coaxial meltblown system with a support structure that includes a removable box and a mask, allowing easy assembly and disassembly by sliding the box into a housing, and enabling conversion to produce different nonwoven fabrics by replacing the box without disassembling the air plates.
Facilitates simple, efficient, and economical assembly and maintenance, reduces axiality losses, and allows easy conversion to produce various nonwoven fabrics by replacing the box, maintaining high processing efficiency.
Smart Images
Figure MX434519B0
Abstract
Description
MULTI-ROW COAXIAL BLOW-IN FUSION SYSTEM Field of Invention The present invention aims at a multi-row coaxial blow melting system of the type specified in the preamble of the first claim. In other words, the present invention aims at a system for the manufacture of extruded polymeric filaments intended to produce directly or indirectly non-woven fabric, also known as TNT. Background of the Invention As is widely known, nonwoven fabric, or TNT, is an industrial product similar to a textile, but obtained through processes other than weaving and knitting. Therefore, within a nonwoven fabric, the fibers exhibit a random pattern, without any identifiable ordered structure, whereas in a woven fabric, the fibers have two predominant and orthogonal directions, generally called warp and weft. Currently, a variety of products containing TNT are manufactured, depending on the manufacturing technique used, which is mainly related to the use of the product itself. A distinction is made, in particular, between high-quality nonwoven fabrics for hygiene products and low-quality nonwoven fabrics used mainly for geotextiles (geotex). From a technical point of view, non-woven fabrics, also known by the English term non-woven fabric, can be basically subdivided into hydro-interlaced, spunbond and melt-blown. Within blow fusion technology, in particular, there is multi-row coaxial blow fusion, or multi-row coaxial blow fusion systems. An example of such a system is shown in Figures 6-8. In general, such systems involve stretching the polymer that comes out of the tubes, arranged in rows, through the air that passes coaxially from the outside of the tube and drives the fibers downwards. In particular, multi-row coaxial blow fusion systems comprise components that define coaxial holes, arranged in ML / a / ZUZZ / UU 11 u» - 2 rows, capable of accommodating at least part of said tubes that pass coaxially within the holes so as to allow diffusion of the polymeric fluid and, at the same time, allow diffusion of air or gas from at least part of the holes. Typically, such systems include apparatus, called spinning packages, comprising a plurality of different components capable of interacting with each other. A spinning package generally consists of a spinneret and a diffusion device that includes one or more components called air plates. In addition, the row can be connected at the same time to a cone and / or a breaker plate. If present, the breaker plate is also connected to an extrusion head capable of delivering at least the polymer fluid and possibly also pressurized air or gas to the spinning package. The breaker plate and cone have essentially the same characteristics as the breaker plate and cone used in spunbond and meltblown bonding technologies. However, multi-row coaxial melt blow systems that include spinning packs do not include a diffusion device that includes a support to support an air knife, do not include a cusp, or do not have a simple die that only allows the polymer to escape. In multi-row coaxial meltblown systems, the spinneret essentially serves as a support for the tubes that eject the polymer filaments. The diffusion device is therefore attached to the spinneret and comprises an intermediate plate, or air plate, capable of allowing the passage of these tubes and the release of air or another pressurized gas, and an outer mask, or external air plate, typically divergent in shape, from which the polymer filament emerges, pushed downwards by the air, before reaching the conveyor belts present in any nonwoven fabric production system. Multi-wire coaxial blow fusion devices include some significant drawbacks. In particular, to produce a non-woven fabric by meltblowing, it is necessary that the tubes pass through the support, the plate, and the outer mask without losing coaxiality with respect to the holes made, in -3particularly, on the plate and mask to ensure the correct functioning of the system. In fact, it is possible that the ends of the tubes that exit the outer mask through the holes, which are configured with a larger diameter than the tubes to also allow the escape of air or gas, may suffer deformations. This is mainly due to the need to maintain at least one gap between the plate and the outer mask for the distribution of gas or air. Furthermore, the systems just described have several overlapping plates and are not very compact or difficult to disassemble. Using multiple plates during the installation phase leads to considerable problems once the system has undergone multiple processes. Specifically, the plates and masks must fit perfectly on all pipes, and the outer plate and mask must also align perfectly to avoid unwanted overlaps that could lead to pipe breakage or prevent the intermediate and outer air plates from fitting onto the inner air plate. These problems are greatly amplified by the high processing temperatures and expansion that can occur in the various components of multi-row coaxial blow-fusion systems. Furthermore, all the aforementioned problems are greatly amplified when the spinning pack is particularly large, as mounting or dismounting the air plate from the tubes can result in the need to considerably increase the force required to overcome the mutual friction between the air plate and the tubes. Summary of the Invention In this situation, the technical task underlying the present invention is to devise a multi-row coaxial blow melting system capable of substantially overcoming at least some of the aforementioned drawbacks. Within the context of this technical task, an important scope of the invention is to obtain a multi-row coaxial blow-fusion type system capable of facilitating the assembly and disassembly of one or more system components. ML / a / ZUZZ / UU 11 u» Another important objective of the invention is, therefore, to achieve a system whose maintenance is simple, fast, efficient and economical. In conclusion, another objective of the invention is to create a system that is extremely versatile and that allows easy modification of the conformation, understood for example as density or number, of the tubes from which the polymer filaments emerge. The specified technical task and purposes are achieved by means of a multi-wire coaxial blow fusion system as claimed in appended claim 1. The preferred technical solutions are highlighted in the dependent claims. Brief Description of the Figures of the Invention The features and advantages of the invention are clarified below by means of a detailed description of the preferred embodiments of the invention, with reference to the accompanying drawings, where: Figure 1 illustrates a cross-sectional view along the main plane of a multi-row coaxial blow-fusion system according to the invention, wherein the system is assembled and the section shows the first holes in detail; Figure 2 illustrates a cross-sectional view along the secondary plane of a multi-row coaxial blow-fusion system according to the invention, wherein the system is assembled and the section shows the second holes and clamping means in detail; Figure 3 is an exploded view of the system in Figure 1; Figure 4 is an exploded view of the system in Figure 2; Figure 5 illustrates an exploded perspective view of a multi-row coaxial blow melt system according to the invention; Figure 6 illustrates a cross-sectional view of a multi-row coaxial blow-fusion system of the known invention, highlighting the holes in the intermediate air plate through which the air flows; Figure 7 is another cross-sectional view of a multi-row coaxial blow-fusion system of the known technique, where the holes in the intermediate air plate are evident through the -5through which the air flows; and Figure 8 is an exploded, perspective view of a known-art multi-row coaxial blow-melt system showing, from bottom to top, an outer air plate, an intermediate air plate, an inner air plate, a cone, a breaker plate, and a second cone intended to be held in contact with an extrusion head. Detailed Description of the Invention In this document, measurements, values, shapes, and geometric references (such as perpendicularity and parallelism), when associated with words like "close to" or other similar terms such as "approximately" or "substantially," should be considered as exceptions for measurement errors or inaccuracies due to production and / or manufacturing errors, and, above all, except for slight deviations from the value, measurement, shape, or geometric reference to which they are associated. For example, these terms, if associated with a value, preferably indicate a divergence of no more than 10% of the value. Furthermore, when used, terms such as first, second, superior, inferior, primary, and secondary do not necessarily identify an order, a priority of relationship, or a relative position, but can simply be used to clearly distinguish between their different components. Unless otherwise specified, as a result of the following expositions, terms such as processing, computation, determination, calculation, or the like refer to the action and / or processes of a computer or similar electronic computing device that manipulates and / or transforms data represented as physical, such as electronic quantities in computer system records and / or memories, other data represented in a similar manner such as physical quantities within computer systems, records, or other information storage, transmission, or display devices. The measurements and data reported in this text should be considered, unless otherwise stated, as having been made in the ICAO International Standard Atmosphere (ISO 2533:1975). With reference to the figures, the coaxial blow-fusion system of IVI A / a / ZUZZ / UU 11 u» -6 multiple rows according to the invention is referred to globally as number 1. System 1, according to the title, includes some features of common blow-melt systems and other special features. Device 1 is configured for use within a multi-row coaxial blow fusion system. The installation, according to the title, includes some features of common blow-melt installations and other special features. In particular, system 1 preferably includes at least one support 2 and one box 3. The subsequent description of all the components that may be present in a system 1 is made by considering them along a cross-section of the system in a main plane la, or a secondary plane la' parallel to the main plane la, as shown for example in Figures 1-2. Naturally, such an installation 1 and its component parts also extend along a longitudinal direction Ib perpendicular to the main plane la and the secondary plane la', or rather to the cross-sections mentioned above. Thus, essentially, the main plane la and the secondary plane la' of the section are planes displaced relative to each other along the longitudinal direction Ib. Support 2 performs essentially the same functions as an ordinary breaker plate. Thus, support 2 is essentially a mounting device onto which the other components of system 1 are attached. Essentially, support 2 is the main connection element between the system components and the external devices capable of supplying the system with substances used in the normal operation of the same system 1. For example, among the various devices external to system 1, there may be a device capable of supplying pressurized polymeric fluid to the system, or a pneumatic device capable of supplying pressurized air or gas to the system, or others. Among the external devices, in detail, there may be an extrusion head. The extrusion head, as is well known, generally includes at least one main channel. The main channel is preferably designed to allow the passage of a first polymer fluid through the extrusion head. This fluid can be fed into the box by a device external to the system. Preferably, as is the case in common meltblowing systems, the main channel is designed to allow the passage of hot polymer fluid at temperatures of approximately 180°C. For example, the polymer fluid could be polypropylene, polyester, nylon, cellulose, viscose, or other fluids suitable for the production of nonwoven fabrics, or TNT, in a multi-row coaxial meltblowing system. In addition, the extrusion head may also include a secondary channel. The secondary channel is preferably designed to allow gas to pass through the extrusion head. Again, gas can flow into the system from external sources. Preferably, the support 2 comprises one or more first channels 20. Preferably, the support 2 comprises a plurality of first channels 20. The first channels 20 are substantially configured to carry polymeric fluid. In this way, the first channels 20 are adapted to allow the passage of a first polymeric fluid through the support 2. Such fluid can be fed to the support 2 by an apparatus external to the system. Preferably, the first 20 conduits are suitable for being arranged in a fluid passage connection, for example, with the main channel of the extrusion head to receive polymeric fluid from it. The first one or more conduits 20, even in greater detail, are configured to transport the polymeric fluid along or parallel to a supply direction 2a. The supply direction 2a is substantially a vertical direction, preferably perpendicular to the ground or to a roller on which the polymer filaments forming the nonwoven fabric can be deposited. Therefore, the supply direction 2a preferably extends in one of the planes la, la' and is, in general, transverse to the longitudinal direction lb. In addition, support 2 may also comprise at least one second conduit IVI A / a / ZUZZ / UU 11 u» -821. The second conduit 21 is preferably configured to carry air or gas and is therefore suitable for allowing gas to pass through support 2. Again, gas can flow into system 1 from an apparatus outside the system. For example, the second conduit 21 may be in fluid passage connection with the secondary conduit of the extrusion head. Support 2 may include additional elements. For example, support 2 may include filter media 25. The filter media 25, if present, are preferably arranged upstream of the first conduits 20 so that they filter the polymeric fluid. The filter media 25, in particular, may include a common flat filter, substantially a mesh suitable for filtering the first polymeric fluid, or may include a porous element. System 1 may also include a cone 5. Cone 5, if present, is detachably attached to system 2. In particular, cone 5 is essentially a connecting element between support 2 and any device external to system 1. Therefore, cone 5 can be placed between support 2 and the extrusion head. In any case, support 2 may include first means of containment 23. The first clamping means 23 are preferably configured to allow the support 2 to be attached to an external device, for example, the extrusion head, or even to the housing 3 itself. Alternatively, the first clamping means 23 can allow the support 2 to be attached to a cone 5. The first means of clamping 23 can be made with conventional couplings such as, for example, screws and bolts or other solvable joints, or even magnetic connectors provided that they allow stable clamping between external devices, such as the extrusion head or the cone 5 and the support 2. In addition, support 2 preferably also includes second means of clamping 24. The second set of fastening means 24 are configured to allow fastening -9 of support 2 with another system component 1, as specified below. The second means of fastening 24 may be conventional and may be substantially of the same type as the first means of fastening 23. Furthermore, advantageously, the second fastening means 24 are preferably accessible on an opposite side of the support 2 with respect to said first fastening means 23. This feature implies that the support 2 can be advantageously coupled to components on both sides at different times without the use of the first clamping means 23 hindering, for example, the use of the second clamping means 24 and vice versa. Box 3 is preferably attached removably to support 2. Box 3 is substantially a beam element that extends predominantly along or parallel to the longitudinal direction Ib, i.e., a direction transverse to the delivery direction 2a and preferably perpendicular to the plane la or la'. Box 3, in even more detail, is essentially the installation of a first portion 3a, similar to a conventional internal air plate, or spinner, and a second portion 3b, similar to a conventional intermediate air plate. In other words, box 3 is, as a whole, a portion of a spinneret assembly where the external air plate is not present. In fact, box 3 preferably includes a plurality of acceleration ducts 30. The acceleration ducts 30 are preferably arranged in the first portion 3a. The acceleration conduits 30 are substantially configured to receive the first polymeric fluid from the first conduits 20. Therefore, preferably, the acceleration conduits are arranged in fluid passage connection with the first conduits 20. The acceleration ducts 30 extend parallel to the supply direction 2a. In addition, the acceleration ducts 30 are preferably configured to accelerate the first polymer fluid. In this respect, in multi-row coaxial blow fusion systems, the acceleration ducts include, or may comprise, IVI A / a / ZUZZ / UU 11 u» - 10 tubes 10. These tubes 10 can therefore be attached separably to box 3. Tubes 10 are widely known in the current state of the art and are essentially conduits that include at least one converging internal section capable of allowing the acceleration of the first polymeric fluid that passes through them. In addition, the 10 tubes have a substantially cylindrical tubular shape and define diameters normally between 0.6 and 1 mm. In addition, tubes 10 are intended to extend through box 3, as shown in Figures 1 and 3. If the 10 tubes are not one piece with the box 3, the support usually includes housings. The housings can be substantially cavities, including at least one flange or step, within which the tube 10 can be at least partially housed. Tube 10, at the same time, preferably includes a base and a stem. The base is preferably configured to be inserted within one of the accommodations. The stem extends preferentially along the supply direction 2a, or rather in a vertical direction along the cross-section. Therefore, the initial polymer fluid from the first conduits 20 enters substantially into the base of the tubes 10 and is accelerated along the stems. Thus, the tubes 10 are substantially in fluid passage connection with one more of the first ducts 20 and are configured to distribute said polymeric fluid. The acceleration ducts 30 can then be distributed along one or more rows extending parallel to the longitudinal direction. In particular, they are normally distributed regularly to form orderly rows both in the longitudinal direction and along each cross-section of system 1. Sometimes, the acceleration ducts 30 of adjacent rows are offset from each other along the longitudinal direction in such a way that they form a substantially gridded configuration. Box 3 also includes first holes 31 and second holes 32. ML / a / ZUZZ / UU 11 u» - 11 These latter are preferably arranged in the second portion 3b. The first orifices 30 are preferably extended along the direction parallel to the supply direction 2a. Furthermore, they are preferably centered and spaced apart from the acceleration conduits 30 along the distribution axis 2a. Therefore, the first orifices 31 are preferably configured to each accommodate part of a respective tube 10. The tubes 10, as mentioned above, are in turn configured to distribute polymeric fluid. Therefore, the first holes 31 are designed to allow the polymeric fluid to pass through the tubes 10. The second holes 32, on the other hand, are preferably located apart from the first holes 30. They are particularly suitable for allowing the passage of air or gas. Alternatively, the second holes 32 can coincide with the first holes 31 and accommodate the tubes 10, maintaining an external space around them to allow the passage of air or gas. In general, the second holes 31 also extend parallel to the supply direction 2a. Therefore, essentially, the first holes 31 are adapted to accommodate part of the stem of the tubes 10. The latter are attached to the box 3 in the first portion 3a and pass through the first holes 31 in the second portion 3b. The second holes 32, in turn, are intended to allow the passage of air or gas. Box 3 also includes a slit 33. The slit 33 extends transversely to the supply direction 2a between the acceleration conduits 30 and the first orifices 31. In other words, the acceleration conduits 30 and the first orifices 31 are connected by the tubes 10 and separated by the slit 33 which is transverse to the same tubes 10. Thus, the slit 33 is in fluid passage connection with the second orifices 32. Advantageously, the slit 33 extends across the box 3 from side to side. This means that the slit 33 extends, in a plane transverse to the box and parallel to the supply direction 2a, starting at an opening on one side of box 3 and ending at an opening on the opposite side of box 3. Thus, support 2 advantageously comprises a housing 22. IVI A / a / ZUZZ / UU 11 u» - 12 housing 22 is substantially a groove made in the support 2 that extends along the longitudinal direction ib. The housing 22 is also preferably opened on at least one side along the longitudinal direction Ib, such that the housing 3 is removable and insertable by sliding, preferably along the longitudinal direction Ib and along the side comprising said opening. This opening is also preferably resealable by means of locking mechanisms such as, for example, a resealable interlocking plate 26 or a plate 26 that slides in a direction perpendicular to the longitudinal direction Ib, or the like. Housing 22 is configured to contain box 33. Thus, support 2 essentially encompasses box 3 when the latter is in use in system 1. Box 3 essentially acts as an insert or cartridge that can be inserted into support 2. Preferably, therefore, the second conduit 21 accesses housing 22 transversely to the supply direction 2a. In particular, the second conduit 2 accesses housing 22 transversely to both the supply direction 2a and the longitudinal direction 1b. Therefore, slot 33 is in fluid passage connection with the second conduit 21 and is also configured to transport air or gas from the second conduit 21 to the second slots 32. System 1, in addition to what is described, may also include a mask 4. Mask 4 is mostly similar to a common external air plate with some differences. Preferably, mask 4 is removably attached to one or more of the support 2 and the box 3. Preferably, mask 4 is removably attached to support 2, for example, by the second fastening means 24. Therefore, mask 4 acts as a lid that traps box 3 in the housing 22 within support 2. Preferably, mask 4 includes a plurality of third holes 40. The third holes 30 are preferentially centered with respect to the first holes 31. Furthermore, they are capable of accommodating part of the tubes 10 from the first holes 31 of box 3 and are in communication with the second holes 42. In this way, the third holes 40 accommodate part of the tubes 10 and, at the same time, allow the passage of air or gas around them. IVI A / a / ZUZZ / UU 11 u» - 13 the tubes 10. In other words, the third holes 40 are also in fluid passage connection with the second holes 32. To achieve this feature, it is sufficient that the third holes 40 are oversized with respect to the tubes 10 to create a space around the tubes 10 for the passage of air. Mask 4 also includes seat 41. Advantageously, seat 41 is configured to accommodate box 3. In this way, mask 4 can be anchored to box 3. More specifically, seat 41 is preferably delimited by two side panels 41a. The two side panels 41a are advantageously positioned on opposite sides with respect to the supply direction 2a. Therefore, they project parallel to the supply direction 2a and preferably extend parallel to the longitudinal direction Ib. In this way, seat 41 also generally extends parallel to the longitudinal direction Ib. Box 3 therefore comprises at least two slots 34. The two slots 34 are advantageously configured to accommodate the sides 41a. Thus, when box 3 is placed on top of mask 4, or vice versa, substantially the side rails 41a are inserted into the slots 34 so that box 3 is anchored to mask 4. The slots 34 extend into the box 3 preferably parallel to the supply direction 2a at the ends through which the slit 33 passes. The side panels 41a, moreover, preferably define a convergent shape with respect to the supply direction 2a. This shape advantageously facilitates their insertion into the cracks 34 and thus also facilitates the alignment of the third holes 40 with the tubes 10 when, for example, system 1 is assembled. The invention also comprises a conversion kit for a multi-row coaxial blow-fusion system. The kit comprises the system 1 and a plurality of housings 3. The housings 3 are replaceable within the housing 22. However, the housings 3 include different quantities and / or different arrangements of the first holes 31, thus also including the tubes 10 and the second holes 31. This means that, unlike systems of the known technique where it is necessary to remove the outer air plate, the air plate - 14 intermediate and the inner air plate, system 1 allows changing the type of non-woven fabric reproducible with system 1 simply by releasing the mask 4 from the support 2 and replacing the box 3 in the housing 22. Thus, the invention enables an innovative conversion process of system 1 comprising at least one stage of replacing box 3. Furthermore, the invention also comprises a novel procedure for assembling system 1. The process essentially includes at least one introduction stage. In the introduction stage, the box 3 is inserted into the housing 22, arranging the slit 33 in fluid passage connection with at least one second conduit 21 and the tubes 10 in fluid passage connection with one or more first conduits 20. In addition, the assembly procedure may also include a placement stage. In the placement stage, the box 3 is placed in seat 41. The placement stage can be performed equivalently before inserting the box 3 into the housing 22 or even afterward. Additionally, the procedure can include a securing stage where the mask 4 is secured to the support 2. Preferably, the securing stage is performed using the second securing means 24. Furthermore, in even more detail, during the placement stage the side panels 41a are inserted into the crack 34. The invention also makes it possible to perform a new cleaning procedure for system 1. Thus, the cleaning procedure comprises at least one step of removing the housing 3 from the recess 22 and one step of lining the groove 33 with compressed air. Therefore, lining the groove 33 with compressed air also removes the dust deposited inside it. System 1 according to the invention achieves significant advantages. In fact, system 1 allows for the prevention of axiality losses between the tubes housed in part of the diffusion device and the holes made in the system components, since the cleaning of box 3 can be carried out from the sides, through the slit 33, without needing to remove the tubes 10 from the first holes 31, as occurs in systems of ML / a / ZUZZ / UU 11 uu - 15 the known technique. Furthermore, device 1 maintains high processing efficiency while reducing the complexity of installation and maintenance of system 1. The installation of system 1 is extremely simple and easy, and the number of components is reduced to a minimum. Furthermore, system 1 is easily converted to manufacture different types of non-woven fabrics since the conversion is completed simply by replacing box 3 within housing 22. The invention is susceptible of variations within the scope of the inventive concept as defined in the claims. Within this scope, all details are replaceable by equivalent elements and the materials, shapes and dimensions can be any.
Claims
1. A multi-row coaxial blow fusion system comprising: - a support including one or more first conduits configured to carry polymer fluid parallel to the supply direction and at least one second conduit configured to carry air or gas, - a housing removably attached to said support and including: - a plurality of acceleration conduits extending parallel to said supply direction comprising tubes in fluid-pass connection with said first conduits and configured to distribute said polymer fluid, - first orifices extending parallel to said supply direction, centered and spaced with respect to said acceleration conduits along said supply direction and configured to accommodate each portion of said respective tube,- second orifices extending parallel to said supply direction and adapted to allow the passage of air or gas, and - a slit extending transversely to said supply direction between said acceleration conduits and said first orifices in connection with the fluid passage to said second orifices, and characterized in that: - said support comprises a housing configured to contain said box, - said slit extending within said box from side to side to be in fluid passage connection with said second conduit and configured to carry said air or gas from said second conduit to said second orifices.
2. The system according to claim 1, wherein said second conduit accesses said housing transversely to said supply direction.
3. The system according to any of the preceding claims, further comprising a mask removably attached to one or more of said support, and said housing including a plurality of third holes centered with respect to said first holes communicating with said second holes and configured to accommodate part of said tubes and simultaneously permit the passage of said air or gas around said tubes.
4. The system according to claim 3, wherein said mask comprises a seat configured to accommodate said plate.
5. The system according to claim 4, wherein said seat 10 is delimited by two side panels placed on opposite sides with respect to said supply direction and projecting parallel to said supply direction, and said housing comprises at least two slits configured to each accommodate one side panel. 15 6. The system according to any of the preceding claims, wherein said support comprises first clamping means configured to allow the clamping of said support to an extrusion head or said housing and second clamping means are configured to allow the clamping of said mask onto said support and accessible on an opposite side of said support with respect to said first clamping means.
7. A conversion unit for the multi-row coaxial blow fusion system comprising a system according to any of the 25 preceding claims, characterized in comprising a plurality of replaceable housings within said housing and including different quantities and / or different arrangements of said first holes, said tubes, and said second holes. 30 8. The assembly process of a multi-row coaxial blow fusion system according to any of claims 1-6, characterized in that it comprises inserting said box into said housing, arranging said slit in fluid passage connection with at least one of said second conduits and said tubes in fluid passage connection with said one or more first conduits.
9. The process according to claim 8 and at least one of claims 4-5, comprising placing said box inside said seat and securing, after said insertion, said mask onto said support.
10. The cleaning process of a multi-row coaxial blow-fusion system according to any of the preceding claims, characterized in that it comprises: - removing said box from said housing, - coating said recess with pressurized air to remove the dust 10 deposited inside said recess.