Packaging apparatus and method for forming multiple sealed packages filled with dispensable products.

Abstract

A packaging machine (1) for forming multiple sealed packages (2) includes a conveying device (5) configured to advance a web (4) of packaging material, an isolation chamber (10), a tube forming device (13) configured to form a tube (3) from the advancing web (4) of packaging material, a partitioning element (40) positioned inside the tube (3) and designed to divide the tube (3) into a first space (41) and a second space (42), a pressurizing device (43) configured to guide a flow of sterilization gas into the second space (42) and obtain a second gas pressure in the second space (42), a sealing device, a filling device (15), a package forming unit (16) configured to form a package (2) from the advancing tube (3) and seal it laterally, and a control unit (17) configured to control the filling device (15) and the pressurizing device (43) so that in the first transient phase, the filling device (15) becomes inactive and the pressurizing device (43) becomes active.

Description

Technical Field

[0001] The present invention relates to a packaging machine for manufacturing a sealed package of a pourable product, particularly a pourable food product.

[0002] The present invention also relates to a method for manufacturing a sealed package of a pourable product, particularly a pourable food product.

Background Art

[0003] Many liquid or pourable food products, such as fruit juices, UHT (ultra-high temperature treated) milk, wine, tomato sauce, etc., are sold in packages made of sterilized packaging materials.

[0004] As a typical example, there is a parallelepiped-shaped package for liquid or pourable food products known as Tetra Brik Aseptic (registered trademark). This is manufactured by sealing and folding a laminated strip of packaging material. The packaging material has a multi-layer structure in which both sides of a base material layer such as paper are covered with layers of heat-sealable plastic materials such as polyethylene. In the case of a sterile package for long-term storage products such as UHT milk, the packaging material further includes a layer of an oxygen barrier material (oxygen barrier layer), for example, an aluminum foil, which is laid on top of a layer of heat-sealable plastic material and is further covered with another layer of heat-sealable plastic material that forms the inner surface of the package and finally contacts the food.

[0005] This type of package is usually manufactured by a fully automatic packaging machine. The packaging machine passes a web of packaging material through a sterilization device that sterilizes the web at a sterilization station and through an isolation chamber (a closed sterile environment) that maintains and advances the sterilized packaging material web. While the packaging material web passes through the isolation chamber, the packaging material web is folded and sealed longitudinally at a tube-forming station to form a tube having a longitudinal seam. This tube is further sent along a vertical conveying direction.

[0006] To complete the molding operation, the tubes are filled with a sterilized or sterile-treated pourable product, particularly a pourable food, and are sealed laterally while being transported vertically within the packaging molding unit of a packaging machine, and then cut at equal intervals along the cross section.

[0007] This forms a pillow pack within the packaging machine, and the pillow pack has a longitudinal sealing band, an upper transverse sealing band, and a lower transverse sealing band.

[0008] A typical packaging machine comprises a conveying device for feeding a web of packaging material along a web advance path; tubes formed from the web of packaging material along a tube advance path; a sterilizing device for sterilizing the web of packaging material before forming it into tubes; a tube forming and sealing device at least partially located in an isolation chamber and configured to form tubes from the web of packaging material in transit and to seal the tubes longitudinally; a filling device for filling the tubes with a dispenseable product; and a package forming unit adapted to form, laterally seal, and cut individual packages from the tubes of packaging material.

[0009] A typical packaging machine also includes a tension adjuster configured to control the tension of the tube, i.e., the packaging material forming the tube. In particular, it is known that the tension adjuster is placed between the sterilization station and the tube forming station to control the tension of the tube. Examples of packaging machines equipped with a tension adjuster are disclosed in European Patent Registration EP3725692B1 and European Patent Registration EP3725689B1 in the name of the present applicant.

[0010] To accurately form individual packages, the hydrostatic pressure provided by the dispenseable product within the tube must be sufficiently high. Otherwise, irregularly shaped packages may be obtained. Typically, the column of dispenseable product present within the tube to provide the required hydrostatic pressure extends at least 500 mm above the hit position (i.e., the position where each assembly for molding, sealing, and cutting begins to contact the advancing tube). As an alternative, the applicant's European Patent Registration EP3456638B1 proposes providing a pressurizing device configured to introduce a sterile gas into the tube during use, thereby obtaining a gas pressure that provides the appropriate molding pressure within the tube. This reduces the required hydrostatic pressure provided by the product column. [Overview of the project] [Problems that the invention aims to solve]

[0011] Although this machine operates satisfactorily, there is a need to improve its behavior during the transient phase between the stop phase and the operation phase, specifically the transition phase from the stop phase to the restart of the machine. [Means for solving the problem]

[0012] Therefore, an object of the present invention is to provide a packaging machine that overcomes at least one of the aforementioned drawbacks. Another object of the present invention is to provide a method for manufacturing a sealed package that overcomes at least one of the aforementioned drawbacks.

[0013] These objectives are fully achieved by packaging machines and methods for manufacturing sealed packages according to one or more of the attached claims.

[0014] Two non-limiting embodiments of the present invention will be described illustratively with reference to the accompanying drawings. [Brief explanation of the drawing]

[0015] [Figure 1]This is a schematic diagram of the packaging machine according to the present invention, with some parts removed for clarity. [Figure 2] Figure 1 is a magnified view of the packaging machine in detail, with some parts removed for clarity. [Figure 3] Figure 1 schematically illustrates the behavior of the machine during the stop phase, first transient phase, second transient phase, and operation phase. [Modes for carrying out the invention]

[0016] Number 1 shows the entire packaging machine that uses tubes 3 made of packaging material webs 4 to produce sealed packages 2 for dispenseable foods such as pasteurized milk and fruit juice. In particular, when in use, the tubes 3 extend along their longitudinal axes and are positioned especially vertically.

[0017] The web 4 of the packaging material has a multilayer structure, typically consisting of a layer of fibrous material, which is paper, and a structure in which both sides of the web are covered with layers of heat-sealable plastic material such as polyethylene.

[0018] Preferably, the web 4 further comprises a gas and light blocking layer (e.g., aluminum foil or ethylene vinyl alcohol (EVOH) film) and at least first and second heat-sealable plastic material layers. The gas and light blocking layer is superimposed on the first heat-sealable plastic material layer and further covered by the second heat-sealable plastic material layer. The second heat-sealable plastic material layer forms the inner surface of the package 2 that ultimately comes into contact with the food product.

[0019] A typical package 2 produced by the packaging machine 1 comprises a longitudinal seal and a pair of transverse seals 66, in particular a pair of upper and lower transverse seals 66 (i.e., one seal 66 located at the top of the package 2 and another seal 66 located at the bottom).

[0020] Referring to FIG. 1, the packaging machine 1 comprises a conveying device 5 that advances the web 4 along the web advancing path P from the supply station to the forming station 9 in a known manner. During use, the web 4 is formed into the tube 3. The conveying device 5 is also configured to advance the tube 3 along the tube advancing path Q.

[0021] The packaging machine 1 comprises an isolation chamber 10 having an internal environment 11, in particular an internal sterile environment 11, which contains a sterilizing gas, in particular sterilized air, and is separated from the external environment 12.

[0022] The packaging machine 1 comprises a tube forming device 13 that extends along the longitudinal axis and is particularly arranged vertically. In particular, at the forming station 9, it is at least partially, preferably completely, arranged within the isolation chamber 10 and is configured to form the tube 3 from the advancing web 4 during use.

[0023] The packaging machine 1 comprises a sealing device that is at least partially arranged within the isolation chamber 10 and is configured to longitudinally seal the tube 3 formed by the tube forming device 13.

[0024] Preferably, the tube forming device 13 is configured to gradually fold the web 4 into the tube 3. In particular, by overlapping the first edge of the web 4 with the second edge of the web 4 on the opposite side of the first edge, a longitudinal seam portion of the tube 3 is formed, in particular a longitudinal seam portion that is sealed by the operation of the sealing device during use.

[0025] Preferably, the conveying device 5 is configured to advance the tube 3 and the intermediate body of the tube 3 along the tube advancing path Q, particularly from the forming station 9 to the package forming unit 16. In particular, the expression "intermediate body of the tube 3" means any shape of the web 4 after the folding of the web 4 by the tube forming device 13 has started but before the tube structure is obtained. In other words, the intermediate body of the tube 3 is obtained during the process of gradually folding the web 4 to obtain the tube 3, particularly the process of overlapping the first edge and the second edge with each other.

[0026] Preferably, the tube forming device 13 comprises at least two forming ring assemblies 22, and is particularly arranged within the isolation chamber 10 (particularly within the internal environment 11), and is configured to cooperatively fold the web 4 step by step into the tube 3, specifically, by overlapping the first edge and the second edge with each other to form a longitudinal joint portion. In the specific case shown in the figure, the first forming ring assembly 22 is arranged downstream of the second forming ring assembly 22 along the path Q. In particular, the first and second forming ring assemblies 22 are arranged in parallel at intervals from each other. Further, the first and second forming ring assemblies 22 are arranged coaxially with each other and define the longitudinal axis of the tube forming device 13.

[0027] Preferably, the sealing device comprises a sealing head 21 configured to interact with the tube 3 and seal the tube 3 longitudinally, particularly to seal the longitudinal joint portion. In particular, the sealing head 21 is configured to heat the tube 3, particularly along the joint portion. The sealing head 21 can be of a type that operates by induction heating, heat flow, ultrasonic waves, or other means.

[0028] Preferably, the sealing device comprises a pressing assembly configured to apply a mechanical force to the tube 3, particularly to the portion where the first edge and the second edge of the tube 3 substantially overlap, to ensure the sealing of the tube 3 along the joint portion. In particular, the pressing assembly comprises an interacting roller and a counter-interacting roller configured to apply a mechanical force from the opposite side of the joint portion. In use, the joint portion is placed between the interacting roller and the counter-interacting roller. Preferably, the interacting roller is supported by the forming ring assembly 22.

[0029] The packaging machine 1 comprises a filling device 15 for (continuously) filling the tube 3 with a pourable product.

[0030] Referring to Figures 1 and 2, the filling device 15 includes a product storage tank for storing / supplying dispensable products and a filling pipe 27 that is fluid-connected.

[0031] In particular, the filling pipe 27 is configured to guide the dispenseable product into the tube 3 during use. Preferably, the filling pipe 27 is at least partially located inside the tube 3 to supply the dispenseable product to the tube 3 (continuously) during use. Specifically, the filling pipe 27 includes a linear main pipe section 28 extending into the tube 3.

[0032] More specifically, the main pipe section 28 comprises an upper section 29 and a lower section 30 that are (preferably detachably) connected to each other. More specifically, the lower section 30 has an outlet opening into which a product that can be dispensed during use is supplied to the tube 3.

[0033] The packaging machine 1 includes a package forming unit 16 that forms a tube 3 that moves forward during use, seals it laterally, and cuts it laterally to form a package 2. In particular, the package forming unit 16 is located downstream of the isolation chamber 10, the tube forming device 13, and the sealing device along the path Q.

[0034] Referring to Figure 2, the package molding unit 16 is - Multiple actuating assemblies 61 (only one shown) and multiple counter actuating assemblies 62 (only one shown); and - A track (not shown) is configured to move the actuation assembly 61 and the counter actuation assembly 62 forward along their respective forward paths, and in particular, the actuation assembly 61 and the counter actuation assembly 62 move periodically along the forward path. More specifically, the actuation assembly 61 and the counter actuation assembly 62 are movable independently of each other along the track. It is equipped with.

[0035] More specifically, the actuation assembly 61 is configured to cooperate with the counter actuation assembly 62 to form the package 2 from the tube 3 when in use. In particular, the actuation assembly 61 and the counter actuation assembly 62 are configured to shape, laterally seal, and preferably laterally cut the tube 3 to form the package 2.

[0036] More specifically, the actuation assembly 61 and the counter actuation assembly 62 are configured to cooperate with each other to form package 2 from tube 3 as they advance along the actuation portion of the forward path. In particular, while advancing along the forward path, the actuation assembly 61 and the counter actuation assembly 62 advance parallel to tube 3 and in the same direction.

[0037] More specifically, the actuation assembly 61 and the counter actuation assembly 62 are configured to contact the tube 3 as they move forward along the actuation portion of the forward path. In particular, the actuation assembly 61 and the counter actuation assembly 62 are configured to initiate contact with the tube 3 at a (fixed) hit position.

[0038] Furthermore, the actuation assembly 61 and the counter actuation assembly 62 are - Half shell 63 that is in contact with tube 3 and adapted to define at least partially the shape of package 2; - Either a sealing element 64 or a counter-sealing element 65 for laterally sealing a tube 3 located between adjacent packages 2 and forming a lateral seal 66; and - One of the following: a cutting element (not shown, known) or a counter-cutting element (not shown, known) for cutting the tube 3 laterally between adjacent packages 2, particularly between the sealing portions 66. It is equipped with.

[0039] In particular, the half shell 63 is configured to be controlled between an operating position and a resting position by the drive assembly. Specifically, the half shell 63 is configured to be controlled to the operating position when in use, with the operating assembly 61 or the counter operating assembly 62 moving forward along the operating part.

[0040] Furthermore, the sealing element 64 and the counter sealing element 65 can be of a type that operates by induction heating, heat flow, ultrasound, or other means.

[0041] According to preferred non-limiting embodiments, the package molding unit 16 is of the type described in European Patent Publication EP3254980A1 and EP3476751A1 in the name of the present applicant. It is expressly understood that all the functional and structural features of the package forming assemblies described in European Patent Publication EP3254980A1 and EP3476751A1 are applicable to the package molding unit 16 described herein.

[0042] Referring to Figures 1 and 2, the isolation chamber 10 comprises a housing 14 (shown schematically only) that defines the internal environment 11 (i.e., the housing 14 separates the internal environment 11 from the external environment 12). In particular, the internal environment 11 comprises (i.e., includes) a sterilization gas, in particular sterilization air, at a predetermined pressure. Preferably, the predetermined pressure is slightly above the ambient pressure to reduce the risk of contaminant intrusion into the internal environment 11. Specifically, the predetermined pressure is about 100 Pa to 500 Pa (0.001 Bar to 0.005 Bar) higher than the ambient pressure.

[0043] Preferably, the packaging machine 1 includes means (not shown, known means) for supplying a sterilization gas, particularly sterilization air, to the isolation chamber 10, particularly the internal environment 11.

[0044] According to one or more embodiments of the present invention, particularly referring to Figure 2, the packaging machine 1 further, - Partitioning elements 40 that are placed inside tube 3 when in use and are designed to divide tube 3 into a first space 41 and a second space 42 when in use; and - A pressurizing device 43 is configured to guide the flow of sterilization gas into the second space 42, particularly continuously during use, and to ensure that the gas pressure in the second space 42 is higher than the gas pressure in the first space 41. It is equipped with.

[0045] More specifically, the first space 41 is demarcated by the tube 3, particularly the walls of the tube 3, and the partitioning element 40. Furthermore, the first space 41 is connected to the internal environment 11. More specifically, the partitioning element 40 demarcates the first space 41 in its downstream portion, particularly at the bottom.

[0046] More specifically, the second space 42 is partitioned during use by the tube 3, particularly the walls of the tube 3, the partitioning element 40, and the lateral sealing portion 66.

[0047] It should be noted that the outlet opening of the lower section 30 of the filling pipe 27 is open to the second space 42. Therefore, the outlet opening of the lower section 30 is operably located below the compartment element 40.

[0048] More specifically, the first space 41 is located upstream of the second space 42 along the tube forward path Q. More precisely, the first space 41 is located upstream of the partition element 40 along the path Q. In the illustrated example, the second space 42 is located below the first space 41.

[0049] In particular, as will become clear from the following explanation, the second space 42 defines a high-pressure region within the tube 3, and the first space 41 defines a low-pressure region within the tube 3.

[0050] In the context of this application, the high-pressure region (i.e., the second space 42) is understood to have an internal pressure that is approximately 5 kPa to 40 kPa (0.05 bar to 0.4 bar), and particularly approximately 10 kPa to 30 kPa (0.10 bar to 0.30 bar), higher than the ambient pressure (i.e., the pressure in the second space 42 is approximately 5 kPa to 40 kPa (0.05 bar to 0.4 bar), and particularly approximately 10 kPa to 30 kPa (0.10 bar to 0.30 bar), higher than the ambient pressure). In other words, the second space 42 is in an overpressurized state.

[0051] The low-pressure region (i.e., the first space 41) is understood to be a state where the pressure is slightly higher than the ambient pressure. In particular, being slightly higher than the ambient pressure means that the pressure is in the range of 100 Pa to 500 Pa (0.001 bar to 0.005 bar) higher than the ambient pressure.

[0052] More specifically, the first space 41 is (directly) fluidly connected to the internal environment 11. Therefore, the sterilization gas present in the first space 41 can flow into the internal environment 11.

[0053] In particular, tube 3 (and its intermediate portion) is placed at least partially within the isolation chamber 10 (especially the internal environment 11).

[0054] Preferably, the pressure in the first space 41 is (substantially) equal to a predetermined pressure present in the isolation chamber 10, particularly in the internal environment 11. Preferably, the pressure in the first space 41 is in the range of 100 Pa to 500 Pa (0.001 bar to 0.005 bar) higher than the ambient pressure.

[0055] The filling device 15, particularly the filling pipe 27, is configured to guide the dispenseable product into the second space 42. Therefore, during use, the second space 42 contains the dispenseable product and pressurized sterilization gas. The pressurized sterilization gas provides the hydrostatic pressure necessary for accurate packaging of the package 2 (i.e., the sterilization gas replaces the effect of the column of dispenseable product within the tube 3).

[0056] Advantageously, the partitioning element 40 is designed to provide at least one fluid passage 44, particularly having an annular shape, which fluidly connects the second space 42 and the first space 41 during use. This allows for leakage of sterilization gas from the second space 42 (high-pressure region) to the first space 41 (low-pressure region) during use. Specifically, during use, sterilization gas leaks from the second space 42 (high-pressure region) to the first space 41 (low-pressure region) through the fluid passage 44. By providing the fluid passage 44, it becomes possible to control the gas pressure in the second space 42 with greater precision. Preferably, the partitioning element 40 is designed so that the fluid passage 44 is formed by the gap between the inner surface of the tube 3 and the partitioning element 40, particularly the peripheral edge 45 of the partitioning element 40, during use.

[0057] In particular, the pressurizing device 43 is configured to supply sterilization gas at a variable flow rate of approximately 10 to 200 Nm3 / h, especially 20 to 180 Nm3 / h, and more specifically, approximately 25 to 150 Nm3 / h.

[0058] Preferably, the pressurizing device 43 is adjusted to change the flow rate of the sterilization gas in response to the sterilization gas flowing from the second space 42 to the first space 41, particularly through at least the fluid passage 44.

[0059] Advantageously, the pressurizing device 43 is designed to provide a closed sterilization gas circuit from the internal environment 11 to the second space 42 and back to the internal environment 11. More specifically, the pressurizing device 43 is configured to draw sterilization gas from the internal environment 11, pressurize (compress) the sterilization gas, and guide the pressurized (compressed) sterilization gas to the second space 42.

[0060] Preferably, the pressurizing device 43 includes a pump device 46 configured to draw sterilization gas from the internal environment 11, pressurize (compress) the sterilization gas, and guide the pressurized sterilization gas to the second space 42. Preferably, the pump device 46 is a rotating machine, and more specifically, a compressor.

[0061] The packaging machine 1 also includes a control unit 17 for controlling the operation of the packaging machine 1.

[0062] Preferably, the rotating machinery, in particular the compressor, is configured to maintain a substantially constant gas pressure in the second space 42, thereby enabling a variable flow rate of sterilization gas in response to the gas flow from the second space 42 to the first space 41 (through the fluid passage 44).

[0063] Preferably, the pressurizing device 43 includes a gas supply pipe 48 that is at least indirectly fluid-connected to the internal environment 11 and the second space 42 in order to deliver sterilization gas from the internal environment 11 to the second space 42. In particular, the gas supply pipe 48 is directly fluid-connected to the second space 42. Preferably, the gas supply pipe 48 is at least indirectly connected to a pumping device 46, particularly a compressor.

[0064] More specifically, the gas supply pipe 48 includes at least a main section 49 that extends into the tube 3 when in use. In particular, the main section 49 extends parallel to the main pipe section 28. More specifically, at least the main section 49 and the main pipe section 28 are coaxial with each other.

[0065] In the illustrated example, the filling pipe 27 extends at least partially into the gas supply pipe 48. Alternatively, the gas supply pipe 48 may extend at least partially into the filling pipe 27.

[0066] More specifically, at least the main pipe portion 28 of the filling pipe extends at least partially into the main portion 49 of the gas supply pipe.

[0067] In particular, the cross-sectional diameter of the main pipe section 28 of the filling pipe is smaller than the cross-sectional diameter of the main section 49 of the gas supply pipe.

[0068] Preferably, the gas supply pipe 48 and the filling pipe 27 define / restrict the annular conduit 50 for supplying sterilization gas to the second space 42. In particular, the annular conduit 50 is restricted by the inner surface of the gas supply pipe 48 and the outer surface of the filling pipe 27.

[0069] In other words, during use, the sterilization gas is introduced into the second space 42 through the annular conduit 50.

[0070] The pressurizing device 43 further, - Pumping device 46, in particular a rotating machine, more specifically a compressor, and a first gas conduit 51 directly fluid-connected to the gas supply pipe 48; and - The internal environment 11 and the pumping device 46, in particular the rotary machine, and more specifically the compressor and the second gas conduit 52 directly connected to the fluid, It is equipped with.

[0071] Therefore, during use, sterilization gas is taken out from the internal environment 11 via the gas conduit 52, pressurized (compressed) by the pump device 46, and then guided into the second space 42 via the gas conduit 51 and gas supply pipe 48.

[0072] Preferably, the compartment element 40 is detachably connected to at least a portion of the filling pipe 27 and / or the gas supply pipe 48, particularly in a floating manner (i.e., with some play). In other words, the compartment element 40 is configured to move (slightly) parallel to the tube 3 as it moves forward during use.

[0073] Referring to Figure 1, the packaging machine 1 further includes a tension adjustment device 32 configured to control the tension of the tube 3. In particular, the tension of the tube 3 can be adjusted depending on the periodic forward speed of the web 4 and / or the tube 3, and / or depending on the operation of the packaging forming unit 11.

[0074] In particular, the tension adjustment device 32 is positioned upstream of the tube forming apparatus 13 along the web advance path P and is configured to adjust the tension of the tube 3, especially the tension of the portion of the web 4 extending between the tension adjustment device 32 and the tube forming apparatus 13.

[0075] Referring to Figure 1, the tension adjustment device 32 is - Main drive roller 33 that can rotate around the main rotation axis; and - A main drive motor, particularly a servo motor, is connected to the main drive roller 33 and configured to rotate the main drive roller 33 around the main rotation axis. It is equipped with.

[0076] According to a preferred, non-limiting embodiment, the tension adjustment device 32 is - Auxiliary drive roller 35 that can rotate around an auxiliary rotation axis; and - An auxiliary drive motor, particularly an auxiliary servo motor, is connected to the auxiliary drive roller 35 and configured to actuate and / or control the rotation of the auxiliary drive roller 35 around the auxiliary rotation axis. To further prepare.

[0077] According to a preferred, non-limiting embodiment, the auxiliary drive roller 35 and the main drive roller 33 are spaced apart along the web forward path P, with the auxiliary drive roller 35 positioned upstream of the main drive roller 33.

[0078] According to a preferred, non-limiting embodiment, the tension adjustment device 32 is - A main counter roller 36 that is rotatable about a central axis and is positioned adjacent to the main drive roller 33, particularly in the tangential direction; and - Auxiliary counter roller 37 that is rotatable about a central axis, adjacent to the auxiliary drive roller 35, and particularly positioned tangentially, To further prepare.

[0079] In particular, during use, the web 4 is interposed between the main counter roller 36 and the main drive roller 33, especially between the auxiliary counter roller 37 and the auxiliary drive roller 35, and / or moves forward.

[0080] Advantageously, the control unit 17 is configured to control the main drive motor so that the angular velocity of the main drive roller 33 changes periodically to control the tension of the tube 3, and in particular to control the tension of the portion of the web 4 extending between the main drive roller 33 and the tube forming apparatus 13.

[0081] According to a preferred, non-limiting embodiment, the control unit 17 is configured to control the main drive motor such that the angular velocity and / or angular acceleration of the main drive roller 33 are changed and / or controlled in response to the operation of the package molding unit 16 and / or the package forming cycle and / or the forces acting on the tube 3 and / or the operation of the filling device 15 and the filling of the tube 3.

[0082] According to a preferred, non-limiting embodiment, the control unit 17 is configured to control the auxiliary drive motor and the main drive motor between the auxiliary drive roller 35 and the main drive roller 33 such that the free loop 38 of the web 4 expands and / or advances when in use. In the present invention, the term free loop 38 indicates that the portion of the web 4 that expands and / or advances between the auxiliary drive roller 35 and the main drive roller 33 is not subjected to any tension and defines and / or forms the free loop 38.

[0083] Preferably, the control unit 17 is configured to control the auxiliary drive motor such that the angular velocity of the auxiliary drive roller 35 controls the extension of the free loop 38 that expands and / or advances between the auxiliary drive roller 35 and the main drive roller 33.

[0084] In particular, during use, the angular velocity of the auxiliary drive roller 35 substantially controls the extension of the free loop 38, and the angular velocity of the main drive roller 33 substantially controls the tension of the tube 3.

[0085] According to a preferred, non-limiting embodiment, the packaging machine 1 further includes a sterilizer for sterilizing at least a portion of the web 4, preferably at least a first surface, more preferably the first and second surfaces, in particular, while advancing the web along the sterilization section of the web advance path during use, toward at least the first surface. Preferably, the sterilizer is configured to sterilize at least a portion of the web 4 in a sterilization station located upstream of the tube formation station along the web advance path P. Preferably, the sterilization station is fluidly connected to the isolation chamber 10.

[0086] In particular, the irradiation device comprises at least a first irradiation emitter, particularly a first electron beam emitter, configured to apply sterilization irradiation, particularly electromagnetic wave irradiation, and more specifically electron beam irradiation, to the first surface of the packaging material web 4. Preferably, the irradiation device further comprises a second irradiation emitter, particularly a second electron beam emitter, configured to apply sterilization irradiation, particularly electromagnetic wave irradiation, and more specifically electron beam irradiation, to the second surface of the packaging material web 4 when in use.

[0087] Preferably, the irradiation device is of the type described in European Patent Publication EP3549878A1 and European Patent Publication EP3549613A1 in the name of the present applicant. It is expressly understood that all the functional and structural features of the devices described in European Patent Publication EP3549878A1 and European Patent Publication EP3549613A1 are applicable to the irradiation device described herein.

[0088] According to a preferred, non-limiting embodiment, the packaging machine 1 further comprises a folding unit configured to receive a sealed package 2 from a package forming unit 16 and produce a folded package.

[0089] It should be noted that the package 2 (so-called "pillow package") produced by the package molding unit 16 comprises a body, a first end, and second ends positioned on both sides of the body. The first end includes a first fin and a pair of first flaps projecting laterally from the body, and the second end includes a second fin and a pair of second flaps projecting laterally from the body. In particular, the first fin has a rectangular shape and projects from an (upper) lateral sealing portion 66, and the second fin has a rectangular shape and projects from another (lower) lateral sealing portion 66. The first end tapers from the body toward the first fin, and the second end tapers from the body toward the second fin. The first flaps have a substantially triangular shape and project from the counter-side of the first end. The second flaps have a substantially triangular shape and project from the counter-side of the second end.

[0090] The folding unit is - An endless conveyor that continuously transports package 2 along a folding path from the supply station to the discharge station; - A first bending means that periodically interacts with package 2 to flatten the first end, bend the first fin toward the first end, and bend the first flap toward the second end toward the main body; - A second bending means for flattening the second end, folding the second fin towards the second end, and folding the second flap towards the second fin. It essentially provides this.

[0091] Preferably, the folding unit further includes a heating device that acts on the folded first and second flaps to melt the outer layer of the packaging material and seal the flaps before they are pressed against the main body and the second fin.

[0092] Preferably, the folding unit further comprises a pressing device that cooperates with package 2 to hold the flap on the flattened fin while the flap is cooled. A heating device is positioned, in particular, between the folding means and the pressing device along the folding path.

[0093] In particular, the heating device includes an assembly air device, a pair of first nozzles connected to the assembly air device and configured to blow hot air onto the first flap of the package before the package 2 reaches the pressing device, and a pair of second nozzles connected to the assembly air device and configured to blow hot air onto the second flap of the package 2.

[0094] Preferably, the folding unit is of the type described in European Patent Application Publication EP3549613A1 in the name of the present applicant. It is expressly understood that all the functional and structural features of the apparatus described in European Patent Application Publication EP3549613A1 are applicable to the folding unit described herein.

[0095] According to a preferred, non-limiting embodiment, the packaging machine 1 further comprises a strip-fitting device configured to apply a sealing strip onto a web of packaging material. The strip-fitting device comprises a forwarding device configured to advance the sealing strip along a strip-forwarding path toward the web 4 of packaging material and position it on the web 4 before the formation of the tube 3. The strip-fitting device comprises a heat distribution device configured to blow a stream of heated gas (particularly air) onto the web 4 and / or the sealing strip. The strip-fitting device comprises an adhesion device configured to adhere the sealing strip to the web 4.

[0096] Preferably, the strip mounting device is of the type described in European Patent Application Publication EP4137295A1 in the name of the present applicant. It is expressly understood that all the functional and structural features of the device described in European Patent Application Publication EP4137295A1 are applicable to the folding unit described herein.

[0097] The control unit 17 is configured to control the operation of the filling device 15 and the package molding unit 16, and preferably also to control the operation of the pressurizing device 43. In particular, the control unit 17 is configured to control the filling device 15, the package molding unit 16, and preferably the pressurizing device 43 to define the operation phase and the stop phase. Specifically, in the operation phase, the packaging machine 1 produces sealed packages 2 filled with dispenseable products. In the stop phase, the packaging machine 1 is stopped, and no packages 2 are produced.

[0098] During the operating phase, the filling device 15 is in an active state, continuously filling the tube 3 with a product that can be dispensed.

[0099] Furthermore, during the operation phase, the package molding unit 16 is in an active state, forming the package 2 from the advancing tube 3 and sealing it laterally.

[0100] Preferably, during the operating phase, the pressurizing device 43 is in an active state, directing the flow of sterilization gas into the second space 42 in order to obtain a second gas pressure in the second space 42.

[0101] During the shutdown phase, the filling device 15 is in an inactive state and does not fill the tube 3 with a product that can be dispensed.

[0102] Furthermore, during the stop phase, the package molding unit 16 is in an inactive state, not forming a package 2 from the advancing tube 3 and not performing lateral sealing.

[0103] Preferably, during the shutdown phase, the pressurizing device 43 is in an active state to maintain overpressure in the second space 42.

[0104] In particular, the filling device includes a filling valve connected to a filling pipe 27, which is operable in an open position that allows the dispenseable product to flow through the filling pipe 27 (particularly the outlet of the lower section 30) and in a closed position that prevents the dispenseable product from flowing through the filling pipe 27 (particularly the outlet of the lower section 30). The control unit 17 is configured to control the filling valve to switch the filling device 15 between an active and an inactive state.

[0105] According to this disclosure, the control unit 17 is configured to control the filling device 15 and the package molding unit 16, preferably the pressurizing device 43, and to define at least a first transient phase. In particular, the first transient phase is after the stop phase and before the operation phase. Therefore, the first transient phase occurs when the machine is restarted following the stop phase.

[0106] During the first transient phase, the filling device 15 is in an inactive state.

[0107] Furthermore, during the first transient phase, the package molding unit 16 is in an active state.

[0108] Preferably, in the first transient phase, the pressurizing device 43 is in an active state.

[0109] In the first transient phase after the shutdown of the packaging machine 1, the filling device 15 is inactive, but the packaging machine 1 has already started manufacturing the package 2. However, because the filling device 15 is still inactive, the package 2 is not filled with the liquid product. In this way, in the first transient phase, the packaging machine 1 is prepared for the subsequent operation of the filling device 15. This ensures that the package design is under control when the filling device 15 is activated, preventing molding problems (packaging not being properly formed and / or not having the correct shape). At the same time, the integrity of the tube is ensured.

[0110] It should be noted that the package molding unit 16 is configured to release the sealed package 2 according to the release rate. It should be noted that the release rate, web advance rate, and tube advance rate are substantially equal to each other.

[0111] The control unit 17 is configured to control the package molding unit 16 so that the discharge rate is substantially equal to the operating discharge rate during the operating phase (or part thereof). The control unit 17 is also configured to control the package molding unit 16 so that the discharge rate is less than the operating forward speed during the first transient phase. This reduction in discharge rate helps ensure the integrity of the tube during the first transient phase.

[0112] In particular, the first transient phase comprises a first part in which the discharge rate increases from zero to a first transient rate (smaller than the operating discharge rate), and a second part following the first part in which the discharge rate is kept constant and equal to the first transient rate.

[0113] Preferably, the control unit 17 is configured to control the rotational speed of the compressor of the pressurizing device 43. In particular, during the stop phase, the compressor operates at a base rotational speed. Preferably, the base rotational speed is not zero, and especially greater than zero. During the operating phase, the compressor operates at an operating rotational speed greater than the base rotational speed. During the first transient phase, the compressor operates at a first transient rotational speed greater than the base rotational speed and less than the operating rotational speed. The combination of operating the compressor at a first transient rotational speed less than the operating rotational speed and having a release speed less than the operating release speed contributes to ensuring the integrity of the tube (particularly the integrity of the longitudinal seal) during the first transient phase.

[0114] It should be noted that during the stop phase, the tube is empty of any product that can be dispensed. By operating the compressor to the first transient rotation speed, the tube 3 can be pressurized with sterilization gas. In this way, during the first transient phase, the packaging machine 1 can produce an empty package with internal pressure from the sterilization gas, thereby enabling proper shaping.

[0115] In particular, the inventors recognized that a low second gas pressure (and consequently, compressor rotation speed) in the second space 42 and / or tube 3 is preferable to ensure tube integrity when the machine is restarted. However, to properly form the package and avoid contamination inside tube 3, it is necessary to increase the second gas pressure (and therefore the compressor rotation speed) in the second space 42 and / or tube 3. Therefore, by operating the compressor at a first transient rotation speed, which is an intermediate value between the basic rotation speed and the operating rotation speed, a good result can be obtained in which the integrity of the tube (especially the longitudinal seal) is ensured, the package is properly formed, and contamination inside tube 3 is avoided.

[0116] Preferably, the control unit 17 is configured to further control the filling device 15, the package molding unit 16, and the pressurizing device 43 to define a second transient phase after the first transient phase and before the operating phase. Thus, after the stop phase, the first transient phase, the second transient phase, and the operating phase occur in sequence. In the second transient phase, the filling device 15 is in an active state. Also in the second transient phase, the package molding unit 16 is in an active state. Furthermore, in the second transient phase, the compressor operates at a rotational speed greater than the first transient rotational speed and less than the operating rotational speed.

[0117] In particular, the second transient phase includes a first part and a second part. The first part of the second transient phase occurs immediately after the second part of the first transient phase. That is, there is no intermediate phase between the second part of the first transient phase and the first part of the second transient phase. In the first part of the second transient phase, the rotational speed increases from the first transient rotational speed to the second transient rotational speed. In the second part of the second transient phase, the rotational speed maintains a constant value equal to the second transient rotational speed.

[0118] Preferably, the control unit 17 is configured to control the package molding unit 16 so that the release rate does not change from the first transient phase to the second transient phase. In particular, the control unit 17 is configured to control the package molding unit 16 so that the release rate is the same in the second part of the first transient phase and the first part of the second transient phase, i.e., equal to the first transient release rate.

[0119] The filling device 15 is confirmed to be operating at the start of the second transient phase, i.e., at the start of the first part of the second transient phase. In the first part of the second transient phase, the tube 3 is filled with the dispenseable product, the discharge rate is kept constant, and the compressor rotation speed increases. At the end of the first part of the second transient phase, the tube 3 is filled with the dispenseable product. Therefore, in the second part of the second transient phase, the packaging machine 1 produces a package 2 that is already filled with the dispenseable product. However, in the second part of the second transient phase, the discharge rate, and consequently the compressor rotation speed, remains lower than the values ​​in the operating phase. In this way, in the second part of the second transient phase, the filling of the tube is stabilized while ensuring the integrity of the tube.

[0120] Subsequently, the second phase of the second transient phase preferably includes a third part that follows the second part and precedes the operating phase, in which the discharge rate and the compressor rotational speed are increased to the operating discharge rate and operating rotational speed.

[0121] Preferably, the second transient phase lasts for at least 10 seconds and less than 40 seconds, more preferably at least 15 seconds and less than 35 seconds. In particular, the first part of the second transient phase lasts for at least 1 second and less than 5 seconds. The second part of the second transient phase lasts for at least 5 seconds and less than 15 seconds. The third part of the second transient phase lasts for at least 5 seconds and less than 15 seconds.

[0122] Preferably, the first transient phase lasts for at least 5 seconds and less than 25 seconds, preferably at least 10 seconds and less than 20 seconds.

[0123] According to one aspect of the present invention, the control unit 17 is configured to control the transport device 5 such that the tube advance speed along the tube advance path Q and / or the web advance speed along the advance path P are substantially equal to the discharge speed of the package 2.

[0124] Preferably, the control unit 17 is configured to control the transport device 5 as follows: - During the operating phase, the conveying device 5 is in an active state, advancing the web 4 of the packaging material along the forward path P; - During the stop phase, the conveying device 5 is in an inactive state, not advancing the web 4 of the packaging material along the forward path P; - In the first transient phase, the transport device 5 is in an active state; and preferably, - During the second transient phase, the transport device 5 is in an active state.

[0125] In particular, during the first transient phase, the control unit 17 is configured to control the conveyor 5 so that the forward speed of the packaging material web 4 and / or tube 3 is lower than that during the operating phase. Preferably, the control unit 17 controls the conveyor 5 so that the forward speed of the packaging material web 4 and / or tube 3 increases from zero to the transient forward speed value during the first part of the first transient phase. Subsequently, the control unit 17 controls the conveyor 5 so that the forward speed of the packaging material web 4 and / or tube 3 maintains a constant speed equal to the transient forward speed value during the second part of the first transient phase and the first and second parts of the second transient phase. Subsequently, during the third part of the second transient phase, the control unit 17 is configured to control the conveyor 5 so that the forward speed of the packaging material web 4 and / or tube 3 increases from the transient forward speed value to the operating speed.

[0126] During the operating phase, the tube advance speed and / or web advance speed are the operating speed. During the stopping phase, the tube advance speed and / or web advance speed are zero.

[0127] Figure 3 schematically illustrates the behavior described above. Specifically, Figure 3 shows the following trends over time: - Second gas pressure P in the second space 42; - Product level L in tube 3; - Release rate S of the sealed package released by the package molding unit 16.

[0128] Prior to time t0, the packaging machine is in the stop phase. During the stop phase, the package molding unit 16 and the conveying device 5 are inactive, and the package release rate is zero. The pressurizing device is operating, and in particular the compressor is operating at its basic rotational speed, so the second gas pressure in the second space 42 is maintained at a (slightly) higher level than the ambient pressure, for example, 0.01 bar higher than the ambient pressure.

[0129] From time t0 to time t1, the packaging machine 1 is in the first transient phase. During this first transient phase, the package forming unit 16 and the conveying device 5 operate, and (empty) packages are released according to the first transient release rate. Simultaneously, the rotational speed of the compressor increases, and the second gas pressure P in the second space 42 also increases.

[0130] At time t1, the filling device 15 switches to the active state. As a result, tube 3 begins to be filled with the dispenseable product, and the product level L rises.

[0131] From time t1 to time t2, the packaging machine 1 is in the first part of the second transient phase. In this first part, the discharge rate S is kept substantially constant. Furthermore, the compressor rotation speed increases, and the second gas pressure P in the second space 42 increases, while the dispenseable product fills tube 3.

[0132] At time t2, the fluidity level L of the product in tube 3 has reached the operating value (although fluctuations may still occur).

[0133] From time t2 to time t3, the packaging machine 1 is in the second part of the second transient phase. In this second part, the release rate S and the pressure P in the second space 42 are kept substantially constant, and the level L of the dispenseable product is stable or stabilizing.

[0134] At time t3, the level of the dispenseable product is sufficiently stable. From time t3 to time t4, the packaging machine 1 is in the third part of the second transient phase. In this third part, the discharge rate S and the compressor rotation speed increase. As a result, the pressure P in the second space 42 also increases.

[0135] At time t4, the discharge rate reaches the operating discharge rate, and the compressor rotation speed reaches the operating rotation speed. Therefore, from time t4 onward, the packaging machine 1 begins its operating phase.

[0136] Preferably, the control unit 17 is configured to control the sealing device as follows: - During the operating phase, the sealing device is in an active state, sealing the tube formed by the tube forming device in the longitudinal direction. - During the shutdown phase, the sealing device is in an inactive state and does not seal the tube formed by the tube forming device in the longitudinal direction. - In the first transient phase, the sealing device is in an active state; and preferably, - During the second transient phase, the sealing device is in an active state.

[0137] In particular, during the first part of the first transient phase, the sealing force supplied by the seal head increases from zero to the transient sealing force. Subsequently, during the second part of the first transient phase and the first and second parts of the second transient phase, the sealing force is kept substantially constant, equal to the transient sealing force. Then, during the third part of the second transient phase, the sealing force increases to the operating sealing force.

[0138] Preferably, the control unit 17 is configured to control the sterilization device as follows: - During the operating phase, the sterilizer is in an active state in which the sterilizer irradiates at least one front surface of the packaging material. - During the shutdown phase, the sterilizer is in an inactive state where it does not irradiate at least one front surface of the packaging material with sterile light; - In the first transient phase, the sterilization device is in an active state; and preferably, - During the second transient phase, the sterilization device is in an active state.

[0139] In particular, during the first part of the first transient phase, the irradiation force supplied by the sterile irradiation increases from zero to the transient irradiation force. Subsequently, during the second section of the first transient phase and the first and second sections of the second transient phase, the irradiation force is kept substantially constant, equal to the transient irradiation force. Then, during the third section of the second transient phase, the irradiation force increases to the working irradiation force.

[0140] Preferably, the control unit 17 is further configured to control the folding unit as follows: - During the operation phase, the folding unit is in an active state in which the folding mechanism performs at least one folding operation on the package. - During the stop phase, the folding unit is in an inactive state in which the folding mechanism does not perform at least one folding operation on the package; - In the first transient phase, the folding unit is in an active state; and preferably, - During the second transient phase, the folding unit is in an active state.

[0141] In particular, during the first part of the first transient phase, the speed of the folding unit's endless conveyor increases from zero to the transient endless conveyor speed. Subsequently, during the second part of the first transient phase and the first and second parts of the second transient phase, the endless conveyor speed is kept substantially constant, equal to the transient endless conveyor speed. Then, during the third part of the second transient phase, the endless conveyor speed increases to the operating endless conveyor speed.

[0142] Furthermore, in the first part of the first transient phase, the heating force supplied by the heating device of the folding unit increases from zero to the transient heating force. Subsequently, in the second part of the first transient phase and the first and second parts of the second transient phase, the heating force is kept substantially constant, equal to the transient heating force. Then, in the third part of the second transient phase, the heating force increases to the operating heating force.

[0143] Preferably, the control unit 17 is further configured to control the strip mounting device as follows: - During the operating phase, the strip attachment device is in an active state, attaching the sealing strip to the web 3 of the packaging material; - During the shutdown phase, the stripping device is in an inactive state and does not attach sealing strips to the web 3 of the packaging material; - In the first transient phase, the strip attachment device is in an active state; and preferably, - During the second transient phase, the strip attachment device is in an active state.

[0144] Furthermore, in the first part of the first transient phase, the heating force supplied by the heat distribution device of the strip mounting device increases from zero to the transient strip mounting device heating force. Subsequently, in the second part of the first transient phase and the first and second parts of the second transient phase, the heating force supplied by the heat distribution device of the strip mounting device is equal to the transient strip mounting device heating force and kept substantially constant. Subsequently, in the third part of the second transient phase, the heating force supplied by the heat distribution device of the strip mounting device increases to the working strip mounting device heating force.

[0145] Therefore, during the first and second transient phases, while the tube forming apparatus 13 forms the tube 3 and the package forming unit 16 manufactures the sealed package 2, the tube 3 is filled with the dispenseable product, and the sealing apparatus and / or sterilization apparatus and / or folding unit and / or stripping apparatus operate until the packaging machine 1 reaches its operational configuration.

[0146] Furthermore, this disclosure provides a method for forming a plurality of sealed packages 2 filled with a dispensable product. Preferably, this method is carried out by a packaging machine 1, which is the subject of this disclosure.

[0147] This method (particularly in the operating phase) includes the step of advancing the web 4 of the packaging material along the web advance path P via a conveying device 5.

[0148] The method includes the step of forming a tube 3 from a web 4 of a moving packaging material via a tube forming device 13 that is at least partially positioned within the internal environment 11 of an isolation chamber 10 containing a sterile gas (particularly during the operating phase) and extends along the longitudinal axis.

[0149] This method includes the step of advancing the tube 3 along a tube advancement path Q (particularly during the operating phase). A partitioning element 40 is placed inside the tube, dividing the tube into a first space 41 that is fluidly connected to the internal environment 11 and a second space 42 located downstream of the first space 41 along the tube advancement path Q.

[0150] This method (particularly during the operating phase) includes a step of introducing a variable flow rate of sterilization gas into the second space 42 via a pressurizing device, thereby obtaining a second gas pressure in the second space 42. This second gas pressure is higher than the second gas pressure in the first space 41.

[0151] This method (particularly in the operating phase) includes the step of sealing the tube formed by the tube forming apparatus 13 longitudinally via a sealing device at least partially located within the internal environment 11 of the isolation chamber 10.

[0152] This method includes the step of continuously filling the tube 3 with a dispenseable product via the filling device 15 (particularly during the operating phase).

[0153] This method includes the step of forming a package 2 from a forward-moving tube 3 via a package molding unit 16 and sealing (and cutting) it laterally.

[0154] This method includes the step of controlling the tension of the web 4 and / or tube 3 of the packaging material via a tension adjustment device 32 (particularly during the operating phase).

[0155] In particular, this method includes an operating phase in which the filling device 15 is in an active state, continuously filling the tube 3 with a product that can be dispensed, and the package molding unit 16 is in an active state, forming the package 2 from the advancing tube 3 and sealing it laterally.

[0156] Furthermore, during the operating phase, the pressurizing device 43 is in an active state, directing sterilization gas into the second space 42.

[0157] This method includes a stop phase in which the filling device 15 is in an inactive state where it is not filling the tube 3 with a product that can be poured out, and the package molding unit 16 is in an inactive state where it is not forming a package 2 from the advancing tube 3 and is not sealing it laterally.

[0158] Furthermore, during the shutdown phase, the pressurizing device 43 is in an active state, directing the flow of sterilization gas into the second space 42. However, the rotational speed of the compressor of the pressurizing device 43 during the shutdown phase is lower than during the operation phase. As a result, the flow of sterilization gas into the second space 42 during the shutdown phase is less than during the operation phase.

[0159] Furthermore, during the shutdown phase, the conveying device 5 and / or the tube forming device 13 (particularly the strip mounting device), and / or the sealing device, and / or the package forming unit 16, and / or the tension adjustment device 32, and / or the sterilization device, and / or the folding unit are in an inactive state.

[0160] According to this disclosure, the method includes a first transient phase in which the filling device 15 is inactive and the package molding unit 16 is active. During the first transient phase, the pressurizing device 43 is active. The first transient phase is after the stop phase and before the operation phase. Preferably, the first transient phase includes (or is configured as) a first part and a second part, as described above.

[0161] According to this disclosure, the method includes a second transient phase following a first transient phase. Preferably, the second transient phase includes (or comprises) the first, second, and third parts described above.

[0162] The advantages of the packaging machine 1 according to the present invention are clear from the above description.

[0163] When the machine is restarted, a first transient phase is introduced during which tube 3 is pressurized with sterile gas and packaging machine 1 produces already empty packages. The first transient phase ensures the integrity of the tubes while avoiding molding problems (i.e., poor packaging and / or shape defects due to low molding pressure) when filling into the tubes subsequently begins.

[0164] Preferably, a second transient phase is provided after the first transient phase, during which the pressure inside the tube gradually increases to reach the operating pressure value. This second transient phase is also useful for ensuring the integrity of the tube.

Claims

1. A packaging machine (1) for forming multiple sealed packages (2) filled with a dispenseable product, A conveying device (5) configured to advance the web (4) of the packaging material along a forward path (P), An isolation chamber (10) separates the internal environment (11) containing sterilization gas from the external environment (12), A tube forming device (13) extending along the longitudinal axis and at least partially located within the isolation chamber (10), configured to form a tube (3) from the advancing web (4) of the packaging material when in use, A partitioning element (40) is placed inside the tube (3) during use and is designed to divide the tube (3) into a first space (41) which is fluidly connected to the internal environment (11) and a second space (42) which is located downstream of the first space (41) along the tube's forward path. A pressurizing device (43) is configured to guide a sterilization gas flow into the second space (42) during use in order to obtain a second gas pressure in the second space (42) that is higher than the first gas pressure in the first space (41), A sealing device, at least partially located within the isolation chamber and configured to seal the tube (3) formed by the tube forming apparatus (13) in the longitudinal direction, A filling device (15) is configured to fill the tube (3) with a dispenseable product and to guide the dispenseable product into the second space (42), A package molding unit (16) is configured to form the package (2) from a tube (3) that moves forward during use and to seal it laterally, A control unit (17) configured to control the operation of the packaging machine (1), Equipped with, The control unit (17) is configured to control the filling device (15) and the pressurizing device (43) as follows: During the stop phase, the filling device (15) is in an inactive state and does not fill the tube (3) with a product that can be dispensed, and the package molding unit (16) is in an inactive state and does not form the package (2) or seal it laterally. During the operating phase, the filling device (15) is in an active state for filling the tube (3) with a product that can be dispensed, and the package molding unit (16) is in an active state for forming the package (2) and sealing it laterally. The control unit (17) is further configured to control the filling device (15) and the package molding unit (16) as follows: In the first transient phase after the stop phase and before the operation phase, the filling device (15) is in an inactive state, and the package molding unit (16) is in an active state. Packaging machine (1).

2. The pressurizing device (43) includes a compressor configured to extract the sterilization gas from the internal environment (11), compress the sterilization gas, and guide the pressurized sterilization gas into the second space (42), and the control unit (17) is configured to control the pressurizing device (43) as follows: During the aforementioned stopping phase, the compressor operates at its basic rotational speed. During the aforementioned operating phase, the compressor operates at an operating rotational speed greater than the basic rotational speed. In the first transient phase, the compressor operates at a first transient rotational speed that is greater than the basic rotational speed and less than the operating rotational speed. The packaging machine (1) according to claim 1.

3. The aforementioned basic rotational speed is greater than zero. The packaging machine (1) according to claim 2.

4. The control unit (17) is further configured to control the filling device (15), the package molding unit (16), and the pressurizing device (43) to define a second transient phase after the first transient phase and before the operation phase. In the second transient phase, The filling device (15) is in an active state. The package molding unit (16) is in an active state. The compressor operates at a rotational speed greater than the first transient rotational speed and less than the operating rotational speed. The packaging machine (1) according to claim 2 or 3.

5. The package molding unit (16) is configured to release the sealed package (2) according to the release rate, and the control unit (17) is configured to control the package molding unit (16) as follows: In the aforementioned operating phase, the discharge rate is substantially equal to the operating discharge rate. In the first transient phase, the discharge rate is smaller than the operating forward speed. The control unit (17) is configured to control the package molding unit (16) so that the release rate does not fluctuate from the first transient phase to the second transient phase. The packaging machine (1) according to claim 4.

6. The second transient phase lasts for at least 10 seconds and less than 40 seconds. The packaging machine (1) according to claim 4 or 5.

7. The first transient phase lasts for at least 5 seconds and less than 25 seconds. A packaging machine (1) according to any one of claims 1 to 6.

8. The control unit (17) is configured to control the transport device (5) as follows: During the operation phase, the conveying device (5) is in an active state that advances the web (4) of the packaging material along the forward path (P). During the stop phase, the conveying device (5) is in an inactive state, not moving the web (4) of the packaging material along the forward path (P). In the first transient phase, the transport device (5) is in an active state. A packaging machine (1) according to any one of claims 1 to 7.

9. In the first transient phase, the control unit (17) is configured to control the conveying device (5) such that the forward speed of the web (4) of the packaging material is less than the forward speed in the operating phase. The packaging machine (1) according to claim 8.

10. The control unit (17) is configured to control the sealing device as follows: In the aforementioned operating phase, the sealing device is in an active state that seals the tube (3) formed by the tube forming device (13) in the longitudinal direction. During the stop phase, the sealing device is in an inactive state and does not seal the tube (3) formed by the tube forming device (13) in the longitudinal direction. In the first transient phase, the sealing device is in an active state. A packaging machine (1) according to any one of claims 1 to 9.

11. The sterilization apparatus includes an irradiation device configured to sterilize by irradiating at least the first surface of the transport web (4) of the packaging material as it advances through the sterilization section of the web advance path during use, The control unit (17) is configured to control the sterilization device as follows: In the aforementioned operating phase, the sterilizer is in an active state in which it irradiates at least one first surface of the packaging material with sterilization irradiation. During the stop phase, the sterilizer is in an inactive state in which it does not irradiate at least the first surface of the packaging material with sterilization irradiation. In the first transient phase, the sterilization device is in an active state. A packaging machine (1) according to any one of claims 1 to 10.

12. The folding unit is configured to receive the sealed package (2) from the package molding unit (16) and fold it to manufacture the package, and the folding unit comprises an endless conveyor for continuously transporting the package (2) along a folding path from a supply station to a discharge station, and a folding mechanism that cooperates with the package (2) during use to perform at least one folding operation on the package (2), The control unit (17) is configured to control the folding unit as follows: During the operation phase, the folding unit is in an active state in which the folding mechanism performs at least one folding operation on the package. During the stop phase, the folding unit is in an inactive state in which the folding mechanism does not perform at least one folding operation on the package. In the first transient phase, the folding unit is in an active state. A packaging machine (1) according to any one of claims 1 to 11.

13. A method for forming multiple sealed packages (2) filled with a dispenseable product, The steps include: advancing the web (4) of the packaging material along the web advance path (P) via the conveying device (5), The steps include forming a tube (3) from a web (4) of the packaging material as it advances, via a tube forming device (13) that is at least partially positioned within the internal environment (11) of an isolation chamber (10) containing sterile gas and extends along the longitudinal axis, The steps include: advancing the tube (3) along the tube advancement path (Q), Equipped with, A partitioning element (40) is placed inside the tube, dividing the tube into a first space (41) that is fluidly connected to the internal environment (11), and a second space (42) located downstream of the first space (41) along the tube's forward path (Q). To obtain a second gas pressure in the second space (42), a step is to introduce a variable flow rate of sterilization gas into the second space (42) via a pressurizing device (43), and the second gas pressure is higher than the first gas pressure in the first space (41). The steps include sealing the tube formed by the tube forming apparatus (13) in the longitudinal direction via a sealing device at least partially located within the internal environment (11) of the isolation chamber (10), The steps include filling the tube (3) with a product that can be dispensed via the filling device (15), The package (2) is formed from the advancing tube (3) via the package molding unit (16) and sealed laterally. Equipped with, The aforementioned method, The operating phase is such that the filling device (15) is in an active state for filling the tube (3) with a product that can be poured out, and the package molding unit (16) is in an active state for forming the advancing tube (3) and sealing it laterally. The stop phase is characterized in which the filling device (15) is in an inactive state where it is not filling the tube (3) with a product that can be dispensed, and the package molding unit (16) is in an inactive state where it is not forming the advancing tube (3) and is not sealing it laterally. Equipped with, The method includes a first transient phase after the stop phase and before the operation phase, in which the filling device (15) is in an inactive state and the package molding unit (16) is in an active state. method.

14. The pressurizing device (43) includes a compressor, During the aforementioned stopping phase, the compressor operates at its basic rotational speed. During the aforementioned operating phase, the compressor operates at an operating rotational speed greater than the basic rotational speed. In the first transient phase, the compressor has a first transient rotational speed that is greater than the basic rotational speed and less than the operating rotational speed. The method according to claim 13.

15. The package molding unit (16) discharges the sealed package (2) according to a discharge rate, wherein in the operating phase, the discharge rate is substantially equal to the operating discharge rate, and in the first transient phase, the discharge rate is less than the operating forward speed. The method according to claim 13 or 14.

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