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WO2024175535A2 - Procédé d'inspection de qualité de buses d'un module d'impression à jet d'encre - Google Patents

Procédé d'inspection de qualité de buses d'un module d'impression à jet d'encre Download PDF

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Publication number
WO2024175535A2
WO2024175535A2 PCT/EP2024/054131 EP2024054131W WO2024175535A2 WO 2024175535 A2 WO2024175535 A2 WO 2024175535A2 EP 2024054131 W EP2024054131 W EP 2024054131W WO 2024175535 A2 WO2024175535 A2 WO 2024175535A2
Authority
WO
WIPO (PCT)
Prior art keywords
test pattern
nozzles
decor layer
test
paperboard web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2024/054131
Other languages
English (en)
Other versions
WO2024175535A3 (fr
Inventor
Sverker Olsson
Ferenc Tarczal
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tetra Laval Holdings and Finance SA
Original Assignee
Tetra Laval Holdings and Finance SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings and Finance SA filed Critical Tetra Laval Holdings and Finance SA
Publication of WO2024175535A2 publication Critical patent/WO2024175535A2/fr
Publication of WO2024175535A3 publication Critical patent/WO2024175535A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2142—Detection of malfunctioning nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
    • B65B61/26—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for marking or coding completed packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J2025/008—Actions or mechanisms not otherwise provided for comprising a plurality of print heads placed around a drum

Definitions

  • the invention relates to a method for quality inspection of nozzles of an ink-jet print module, a converting unit, a laminated packaging material, and a package folded from a laminated packaging material.
  • Packaging containers of the single use disposable type for liquid foods are often produced from a laminated packaging material.
  • the laminated packaging material is produced as a continuous web, which is either used in a roll-fed package forming and filling machine or cut into separate blanks for use in a blank-fed package forming and filling machine.
  • the laminated packaging material is produced using a converting procedure in which multiple materials are joined and processed to form the ready-to-use web of laminated packaging material.
  • a paperboard web, forming the core layer of the laminated packaging material may be digitally printed on the outside (i.e. the side intended as the exterior side of the laminated packaging material) for example by inkjet printing.
  • Print defects may arise from misfiring, non-jetting, clogged or blocked nozzles, crooked or in any way defective nozzles of the print heads. It is important to be able to detect such defects and accurately associate them with the specific faulty nozzle, single nozzle or multiple nozzles, in order to ensure a desired quality of the packaging material web and optimum print quality performance of the digital printing process.
  • US2009189928A1 discloses an image forming apparatus that forms images with a recording unit by ejecting inks, as coloring material, and treatment liquid from nozzles onto a recording medium, and that prints detection images for each color of ink so as to overlap each other.
  • the recording unit prints a nozzle-check pattern.
  • the nozzle-check patterns are printed between one image region and another image region formed with images instructed for image forming by a user, a specific example thereof being printing in a non-image region provided between each page.
  • the size (width W) of the non-image region is determined based on the size of the nozzle-check patterns.
  • US2017021612A1 discloses a method of testing a print head, a printing method, a device for testing a print head, and a printer which are capable of accurately detecting an abnormality of a recording element in a short period of time.
  • the print head prints a predetermined test chart, and the test chart is tested whether there is an abnormal nozzle based on a result of the output, or not.
  • the test chart is printed in a margin region of the paper to perform the test of the print head during the execution of the printing job. Therefore, printing of an image on the paper is performed with a margin.
  • test charts are printed in margin regions formed between respective images.
  • a method for quality inspection of nozzles of an ink-jet print module comprises forwarding a paperboard web continuously at a substantially constant speed in a machine direction; printing a decor layer on the paperboard web using the ink-jet print module; and printing a test pattern comprising a test element on the paperboard web by activating a plurality of the nozzles, which are intended to be inspected, and the test element having a fixed position in relation to the decor layer.
  • the test pattern is indicative of the quality of each nozzle of the plurality of nozzles.
  • the quality of the nozzles of the ink-jet print module used in printing decor on paperboard webs to form packaging materials can be easily tested due to the fixed positioning of the test pattern in relation to the decor layer, which gives a quick and accurate indication of whether a particular nozzle is faulty or not.
  • a converting unit configured to continuously manufacture a packaging material web.
  • the converting unit comprises a feeding unit configured to continuously forward a paperboard web at a substantially constant speed in a machine direction, an ink-jet print module comprising a plurality of print heads with a plurality of nozzles and being configured to print a decor layer and a test pattern comprising a test element on the paperboard web.
  • the test pattern is printed by activating the plurality of nozzles, such that the test pattern extends or is arranged at a fixed position in relation to the decor layer.
  • the test pattern is indicative of the quality of each nozzle of the plurality of nozzles.
  • a laminated packaging material comprises a paperboard web having a decor layer and a test pattern comprising a test element printed thereon.
  • the test pattern extends at least partially across the decor layer and has a fixed position in relation to the decor layer.
  • a package folded from a laminated packaging material according to the above is provided.
  • the test pattern is at least partly hidden in the folded package.
  • each element of the test pattern is associated with a specific nozzle, which is detectable by inspection. This provides a quick and reliable way of identifying a nozzle which is faulty and in need of service.
  • Detecting print defects is significantly easier if the test elements are fixed in relation to the decor layer. Extension of the test pattern with its test elements across the web enables error detection up to the full paperboard web width which reduces the inspection system complexity. Moreover, the quality inspection method is capable of detecting a single faulty digital printing nozzle, or even two neighboring nozzles, while production is running.
  • Fig. 1 is a schematic view of a converting unit
  • Fig. 2a is a top view of a paperboard web moving through a part of the converting unit of Fig.1 ,
  • Fig. 2b is a top view of a section of a paperboard web
  • Fig. 3 is a flow chart of a method for quality inspection of nozzles of an ink-jet print module
  • Fig. 4 is an alternative top view of a section of a paperboard web.
  • a package such as a liquid food or beverage container, is formed by folding blanks of a laminated packaging material.
  • the packaging material is typically manufactured in a manufacturing unit, such as a converting unit.
  • a decor layer is printed onto a substrate which, after a series of process steps, eventually forms part of the laminated packaging material.
  • the substrate is referred to as a paperboard material.
  • a converting unit 200 configured to manufacture a laminated packaging material web 100 is illustrated schematically.
  • the converting unit 200 includes at least one feeding unit 210, here illustrated as two feeding rolls.
  • the feeding unit(s) 210 is configured to continuously forward a paperboard web 130 at a substantially constant speed, preferably in the machine direction MD as indicated by the arrow markings in Fig. 1 , for example on 200 m/min or faster, particularly 230-280 m/min, more particularly 240-275 m/min, most particularly 270-275 m/min.
  • the converting unit 200 further comprises an ink-jet print module 220 comprising a plurality of print heads 222a-d, each print head 222a-d having a plurality of nozzles.
  • the plurality of nozzles of the ink-jet print module 220 extends across the paperboard web 130 in a transverse direction which is perpendicular to the machine direction MD.
  • the ink-jet print module 220 is configured to print a decor layer 140, as well as a test pattern 150 comprising at least one test element (not shown), on the paperboard web 130. For instance, there may be one printed test pattern per print head 222a-d across the printed substrate, which in this case is the paperboard web 130. This reduces the challenges faced by the in-line detection system to find the potentially misfiring, crooked or in any way faulty nozzles, and makes nozzle inspection possible without complex image recognition system in place.
  • the ink-jet print module 220 is illustrated as a support cylinder and a plurality of print heads 222a-d for cyan C, magenta M, yellow Y and black K. It should be noted that the exact configuration of the ink-jet print module 220 may be different depending on the particular application; for example, the ink-jet printer 220 may comprise multiple print heads 222a-d arranged in the machine direction and/or the transverse direction in order to cover the entire width of the paperboard web 130. Each print head 222a-d may be configured to print a unique color. Alternately, as shown in Fig. 1 , there are several print heads 222a-d for each unique color. Thus, the printed test pattern 150 may comprise a test element for each unique color and/or for each print head 222a-d.
  • Test pattern 150 including test elements
  • Printing of the test pattern 150, including test elements, onto the paperboard web 130 is performed by activating the plurality of nozzles of the ink-jet print module 220, such that the test pattern 150 extends at a fixed position in relation to the decor layer 140.
  • the test pattern 150 is indicative of the quality of each nozzle of the plurality of nozzles.
  • each nozzle of the plurality of nozzles are activated simultaneously, i.e. at the same time.
  • the fixed position of the test pattern 150 in relation to the decor layer 140 is to ensure reproducibility as well as traceability of the test pattern 150.
  • the test pattern 150 which includes a test element, may extend in a direction transverse to the machine direction MD, or in parallel, or in any angle of choice with respect to the machine direction MD.
  • the test element may for instance be a design element, such as a continuous design element, for instance a continues line formed by activating a plurality of the nozzles, which are intended to be inspected as in Fig.2b or Fig.4.
  • the design element is unique, and in a full package width, it may be fully visible only when the package is unfolded, i.e. prior to folding the laminated packaging material 100 into a package.
  • the test pattern is to be understood as having at least one test element, such as a plurality of design elements.
  • the plurality of design elements preferably represents the number of colors used in printing.
  • test pattern 150 may be part of the decor layer 140.
  • test pattern 150 is separate from the decor layer 140.
  • the test pattern 150 and the decor layer 140 should not be interpreted as being totally separate from one another. Rather, they may be separate from each other, or coincide with each other.
  • the test pattern 150 extends at least partially across the decor layer.
  • the test pattern 150 extends across the entire decor layer.
  • the plurality of nozzles of the ink-jet print heads 222a-c may extend transversely across the entire paperboard web 130 to achieve this.
  • the test pattern 150 may extend over the entire decor layer 140 in a continuous or non-continuous manner.
  • the test pattern 150 may be non-continuous.
  • the test pattern 150 may be one whole line, two or more parallel lines, dots, square shapes, shorter line sections, etc.
  • the decor layer 140 is preferably cyclic in the machine direction MD. This means that a repetitive series of decor layers 140 are printed on the paperboard web 130 in the machine direction during printing. Since the test pattern 150 is fixed in relation to the decor layer 140, the test pattern 150 is preferably also cyclic in the machine direction MD. This is further illustrated in Fig. 2a.
  • the test pattern may be printed together with the decor layer at the same constant speed, or at least at the same constant speed but in different occasions.
  • the speed is the production speed of the converting unit, that may be same as the feeding speed of the paperboard web.
  • the converting unit 200 further comprises an inspection unit 260 which is configured to inspect the test element(s) of the test pattern 150 and thereby the quality of each nozzle.
  • the inspection unit 260 may analyze different characteristics of the test element, such as color, continuity, opacity, color intensity, blurriness, etc. of the test element. Any of the characteristics may be analyzed by the inspection unit 260.
  • the continuity of the test element is analyzed. The continuity of the test element is directly related to the quality of the nozzles, and by inspection it is indicated whether the nozzle associated with the test element is defective or not.
  • An in-line defect inspection system in the form of the inspection unit 260 is able to detect errors in the nozzles by investigating the test elements across the entire package. Notably, in some embodiments the inspected test element will partly be hidden once the final package is folded.
  • a test element also referred to as a design element, may be interpreted as an element that forces all nozzles of a predetermined number of nozzles to jet onto the substrate.
  • a controller 300 may be provided in, or in conjunction with (such as remote from), the converting unit 200 to control the operation of the inspection unit 260.
  • the controller 300 may be a digital processing unit or the like.
  • the controller 300 may also be in electronic communication with the feeding unit(s) as well as the ink-jet print module 220 to control their respective function.
  • the inspection unit 260 comprises a camera.
  • the inspection unit 260 is configured to take an image of the test element(s) of the test pattern 150.
  • the controller 300 is configured to analyze the image from the inspection unit 260 with regards to a reference representation of the plurality of nozzles of the print module 220, such as a reference image of 100% well-functioning nozzles. If the captured image comprises deviations from the reference representation, these deviations are processed and associated with specific nozzles of the print module 220 in order to determine fault nozzles of the print module 220.
  • the inspection unit 260 may comprise other means for visual inspection.
  • the converting unit 200 may comprise a drying station 230 configured to dry the decor layer 140, as well as the test pattern 150.
  • the converting unit 200 may further comprise a creasing station 240 configured to provide a crease line pattern to the printed paperboard web 130, and optionally at least one lamination station 250 configured to laminate at least a further layer to the printed and creased paperboard web 130.
  • the so formed laminated packaging material web 100 may be transferred to a cutting and/or folding station (not shown) to form a package.
  • the different elements of the converting unit 200 may be arranged in the following order, upstream to downstream as illustrated in Fig. 1 ; feeding unit(s) 210, ink-jet print module 220, inspection unit 260, drying station 230, creasing station 240, lamination station 250.
  • a priming station (not shown) may also be provided in the converting unit 200, before the ink-jet printer 220.
  • the controller 300 mentioned above may also control the operation of the priming station, as well as the drying station 230, creasing station 240 and lamination station 250.
  • Fig. 2a illustrates a paperboard web 130 moving through a part of the converting unit 200 described above. More specifically, the paperboard web 130 is fed from the feeding unit 210, in the machine direction MD, towards the ink-jet print module 220 where the decor layer 140 and the test pattern 150 are printed onto the paperboard web 130. The decor layer 140 and the test pattern 150 are printed periodically onto the paperboard web 130. Preferably, the periodicity of the print is both in parallel with and perpendicularly to the machine direction MD, as in Fig. 2a. As a result, quality inspection, also referred to as print defect detection, is provided, with full decor design variability. This is because a static, reoccurring, test element is printed on all of the packages to be formed.
  • the printed paperboard web 130 is preferably divided into a plurality of paperboard web sections 160, also referred to as “sections”. Longitudinally aligned sections 160 belong to the same lane 170a-f. As shown in Fig. 2a, the paperboard web 130 may have multiple lanes 170a-f; and each lane 170a-f may have multiple sections 160 longitudinally aligned. On such a web 130, there may be unprinted decor areas between the lanes 170a-f that may be left for slitting to separate the lanes 170a-f from each other, for instance, to make them ready to be fed a roll-fed package forming and filling machine or to be cut further into sections 160 from a single lane 170a-f.
  • the test pattern, particularly at least one test element 151 , of each section on each lane 170a-f may extend along the whole width of the individual lane 170a-f including the stated unprinted decor area by the help of being formed by all nozzles corresponding to the lane 170a-f, see Fig.4.
  • all nozzles of the ink-jet print module 220 may be controlled by forming the test pattern of each lane 170a-f as explained above. This helps also to check some nozzles that are not needed for the current print cycle but that some nozzles may be needed for a later print cycle.
  • the sections 160 may also be referred to as blanks from which a package is to be formed, especially if the web of packaging material later is cut into individual sections for a blank-fed packaging machine.
  • the decor and test pattern prints are preferably identical in the corresponding sections 160 for a specific lane 170a-f, since the packages to be formed from the respective sections 160 are most likely to have the same print when produced by the same package forming unit.
  • Each section 160 includes a number of sub-sections which correspond to different parts of the package to be formed.
  • each section 160 of the printed paperboard web 130 includes three sub-sections 161-163 which correspond to different parts of the package to be formed.
  • the sub-sections, or regions, are preferably separated by crease lines, which intended positions are indicated as dotted lines (however in practice, these crease lines may not be formed until downstream the print module 220).
  • the crease lines may for instance be formed in the creasing station 240 of the converting unit 200 as briefly mentioned in relation to Fig. 1.
  • the decor layer 140 of the section 160 comprises a bottom area 161 , a body area 162 and a top area 163.
  • the bottom area 161 corresponds to a bottom part of the package to be formed
  • the body area 162 corresponds to a main body part of the package to be formed
  • the top area 163 corresponds to an upper part of the package to be formed.
  • the upper part of the package is typically the part from which the food or beverage product is to be poured out. Not all sub-sections of the section 160 need to be printed with a decor layer 140. From the above description, it is clear that a number of packages may be obtained from the packaging material web formed by converting unit 200.
  • Each package is formed by folding a section 160 at the crease lines thereof, and appropriate sealing.
  • the sections 160 referred to in relation to Fig. 2a thus form part of the laminated packaging material 100.
  • the test pattern 150 is preferably printed on each of the multiple sections 160 to be found on each of the packages to be formed.
  • the test pattern 150 is at least partly hidden in the folded package.
  • a package, folded from a laminated packaging material 100 according to the above will comprise an at least partly hidden test pattern 150.
  • the test pattern 150 extends at least partially across the decor layer 140.
  • the test pattern 150 may instead comprise a test element that covers the full package width on each individual package to be formed.
  • the test pattern 150 would for instance be in the shape of one or more continuous lines that would extend from one long side of the section 160 in Fig. 2a to the other long side.
  • the test pattern 150 also has a fixed position in relation to the decor layer.
  • the test pattern 150 is printed in proximity to the bottom area 161 of the decor layer 140.
  • “in proximity” could mean everything from within the bottom area 161 , to bridging the bottom area 161 and the body area 162.
  • the test pattern 150 may as well extend across the entire decor layer 140, such as between the long sides of the decor layer 140.
  • the test pattern is shown as black squares. Each square represents a test element. Furthermore, each test element of the test pattern 150 may for instance represent a unique color.
  • test pattern 150 is provided as a plurality of test elements 151.
  • Each test element 151 is a single line extending across at least the same width as the decor layer 140.
  • Each test element 151 is provided by a unique print head 222a-d being controlled to print from all nozzles covering the desired width of the test element 151.
  • quality inspection of the nozzles used to print the decor layer 140 and the test pattern 150 is performed by checking if there is any deviation in the test elements 151 , compared to perfectly printed continuous lines.
  • Fig. 3 an embodiment of a continuous in-line method for quality inspection of nozzles of an ink-jet print module 220 is illustrated.
  • the method may be performed in the converting unit 200 as described above.
  • the converting unit 200 is configured to perform the method as will now be described.
  • all aspects disclosed with regard to the method may be implied also for the converting unit 200, as well as the other way around.
  • the method includes a step S5 of forwarding a paperboard web 130 continuously, preferably at a substantially constant speed, in a machine direction MD.
  • the machine direction MD may be defined as the direction parallel to the movement of the paperboard web 130 through a manufacturing equipment such as a converting unit 200, or as the circumferential direction of a roll of paper used for providing the paperboard web 130.
  • a step of ink-jet printing S10 a decor layer 140 on the paperboard web 130 is performed, using the ink-jet module 220, and more specifically the nozzles included therein.
  • the paperboard layer 130 may comprise paper, paperboard or other cellulose- based material.
  • Ink-jet printing is a type of digital printing or computer printing. During ink-jet printing, a digital image is recreated by propelling droplets of ink onto a substrate, such as a paperboard layer 130 or a primer layer (not shown).
  • the method may further comprise other printing techniques, such as flexographic printing, and the decor layer 140 may hence be obtained by ink-jet printing only, or by a hybrid approach combining two or more printing techniques. In other words, the decor layer 140 may be ink-jet printed and flexography printed.
  • a step S15 of printing a test pattern 150 comprising a test element (further described above) onto the paperboard web 130 is performed.
  • the step S10 of printing the decor layer 140 and the step S15 of printing the test pattern 150 are performed substantially at the same time, for instance by continuously activating print heads 222a-d of the ink-jet print module 220.
  • the step S15 of printing the test pattern onto the paperboard web 130 is performed by activating a plurality of the nozzles of the ink-jet print module 220.
  • a purpose of providing the test patterns 150 (including test elements) is that the nozzles can be closely monitored and inspected during use of the converting unit 200. In other words, the method is an in-line quality inspection method.
  • the nozzles are inspected in a step S20, using for instance the inspection unit 260 arranged downstream of the ink-jet print module 220 shown in Fig 1.
  • the test pattern 150 is printed in a way such that it has a fixed position in relation to the decor layer 140.
  • the inspection unit 260 inspects the nozzles via their output in the form of the test pattern 150 including the test elements.
  • the test elements are indicative of the quality of each nozzle of the plurality of nozzles of the ink-jet print module 220.
  • the ink-jet print module 220 comprises a plurality of print heads, comprising the plurality of nozzles. Each print head is configured to print a unique color, and the test pattern 150 comprises a test element for each unique color.
  • the plurality of nozzles of the ink-jet print module 220 are activated at the same time.
  • the plurality of nozzles may be all, or a subset of all nozzles of the ink-jet print module 220.
  • the test element is a continuous design element as briefly described in relation to Fig. 1 above.
  • the test pattern 150 extends at least partially across the entire decor layer 140, preferably across the entire decor layer 140.
  • the steps S10 and S15 of printing a decor layer 140 and a test pattern 150 on the paperboard web 130 are performed repeatedly along the paperboard web 130.
  • the paperboard web 130 when moving through a converting unit 200 as disclosed herein, has a print, or coating, which is cyclic along the longitudinal direction of the paperboard web 130.
  • the decor layer 140 is cyclic in the machine direction MD.
  • the test pattern 150 which is fixed in relation to the decor layer in its position, is cyclic in the machine direction MD.
  • the printed paperboard web 130 is preferably divided into multiple sections 160 which are to be folded into respective packages.
  • the packages may also be referred to as food or beverage containers.
  • the sections 160 are preferably separated by a crease line pattern which may be provided in a step S40 after drying the printed decor layer 140 and the printed test pattern 150.
  • the crease line pattern facilitates the formation of a packaging container from the laminated packaging material web 100, see Fig. 1.
  • the crease line pattern is preferably repeated in the machine direction MD.
  • the decor layer 140 is printed within the sections 160 of the printed paperboard web.
  • the test pattern 150 is printed on each of the multiple sections
  • test pattern 150 is preferably such that the test pattern 150 is at least partly hidden after folding the paperboard web 130 to form the package.
  • the decor layer 140 is printed in regions referred to as a bottom area 161 , a body area 162 and a top area 163.
  • a bottom area 161 the decor layer 140 is printed in regions referred to as a bottom area 161 , a body area 162 and a top area 163.
  • a top area 163 the top area 163.
  • only one or a few of the regions of a section is printed on.
  • the test pattern 150 is printed in proximity to the bottom area 163 of the decor layer 140 on the section 160 of the printed paperboard web.
  • packages in the shape of quadrangular prism or like that is formed by folding the filled and sealed laminated packaging material obtained from the paperboard web 130 can have the test pattern 150 on the bottom face thereof, so, while standing on a surface, the test pattern 150 becomes out of sight.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)

Abstract

L'invention concerne un procédé d'inspection de qualité de buses d'un module d'impression à jet d'encre. Le procédé consiste à : faire avancer une bande de carton en continu à une vitesse sensiblement constante dans un sens machine ; imprimer une couche de décor sur la bande de carton à l'aide du module d'impression ; et imprimer un motif de test comprenant un élément de test sur la bande de carton par activation d'une pluralité des buses, qui sont destinées à être inspectées. Le motif de test a une position fixe par rapport à la couche de décor, et est indicatif de la qualité de chaque buse de la pluralité de buses.
PCT/EP2024/054131 2023-02-20 2024-02-19 Procédé d'inspection de qualité de buses d'un module d'impression à jet d'encre Ceased WO2024175535A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23157601 2023-02-20
EP23157601.8 2023-02-20

Publications (2)

Publication Number Publication Date
WO2024175535A2 true WO2024175535A2 (fr) 2024-08-29
WO2024175535A3 WO2024175535A3 (fr) 2024-10-03

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PCT/EP2024/054131 Ceased WO2024175535A2 (fr) 2023-02-20 2024-02-19 Procédé d'inspection de qualité de buses d'un module d'impression à jet d'encre

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EP (1) EP4417432A3 (fr)
WO (1) WO2024175535A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090189928A1 (en) 2008-01-25 2009-07-30 Fuji Xerox Co., Ltd. Coloring material recording device, coloring material recording program, and image forming apparatus
US20170021612A1 (en) 2014-05-20 2017-01-26 Fujifilm Corporation Method of testing print head, printing method, device for testing print head, and printer

Family Cites Families (6)

* Cited by examiner, † Cited by third party
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