WO2016098157A1 - Dispositif de fabrication d'élément de feuille, et procédé de fabrication d'élément de feuille - Google Patents

Dispositif de fabrication d'élément de feuille, et procédé de fabrication d'élément de feuille Download PDF

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Publication number
WO2016098157A1
WO2016098157A1 PCT/JP2014/083133 JP2014083133W WO2016098157A1 WO 2016098157 A1 WO2016098157 A1 WO 2016098157A1 JP 2014083133 W JP2014083133 W JP 2014083133W WO 2016098157 A1 WO2016098157 A1 WO 2016098157A1
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WO
WIPO (PCT)
Prior art keywords
sheet member
roller
sheet
transport
transport roller
Prior art date
Application number
PCT/JP2014/083133
Other languages
English (en)
Japanese (ja)
Inventor
雅和 白石
宜秀 石川
Original Assignee
ユニ・チャーム株式会社
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 ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to JP2015523329A priority Critical patent/JP5799191B1/ja
Priority to PCT/JP2014/083133 priority patent/WO2016098157A1/fr
Publication of WO2016098157A1 publication Critical patent/WO2016098157A1/fr

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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
    • B41J15/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/04—Supporting, feeding, or guiding devices; Mountings for web rolls or spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/038—Controlling transverse register of web by rollers

Definitions

  • the present invention relates to a sheet member manufacturing apparatus and a sheet member manufacturing method.
  • a pattern or a letter is attached to the outer member of the diaper in order to improve the design on the appearance or make it easy to distinguish the front and rear of the diaper.
  • it is common to comprise a diaper using the base material sheet on which images, such as a character, were printed beforehand.
  • a predetermined color design is printed on the entire area of an interior sheet (base material sheet) that covers the back surface of a paper diaper so that the color design can be viewed from the outside of the diaper.
  • Inkjet printing is known as a method for printing an image with good image quality on a diaper.
  • an ink droplet is ejected from a printing device and landed on a base sheet (for example, a nonwoven fabric) that forms a diaper, whereby an image is printed on a landing portion of the ink droplet.
  • base sheet for example, a nonwoven fabric
  • ink droplets are ejected from the inkjet printer installed on the transport path to the base sheet while transporting the base sheet of the diaper in the transport direction.
  • the method of making it known is known.
  • the present invention has been made in view of the above problems, and the object of the present invention is to stably provide a sheet member when inkjet printing an image on the sheet member in an absorbent article production line. It is to carry.
  • the main invention for achieving the above object is: An apparatus for manufacturing a sheet member according to an absorbent article, wherein the sheet member is provided on a downstream side in the transport direction with respect to a first transport roller that transports the sheet member in a transport direction while supporting the sheet member.
  • a transport unit having a second transport roller, a support roller provided between the first transport roller and the second transport roller and supporting the sheet member, and the first transport roller,
  • a printing unit that prints an image by ejecting ink droplets onto the sheet member from an ink ejection device disposed between the second conveyance roller and the first conveyance roller being the sheet member
  • the position where the support roller supports the sheet member is higher than the position where the support roller supports the sheet member, and the support roller is higher than the position where the second transport roller supports the sheet member.
  • the position where the roller supports the sheet member is higher, and the inclination of the rotation axis in the horizontal plane is changed with respect to at least one of the first conveyance roller and the second conveyance roller.
  • the sheet member manufacturing apparatus is characterized in that skew is adjusted.
  • an image with good image quality can be printed by stably conveying the sheet member.
  • FIG. 1 It is a schematic perspective view of the underpants type diaper 1 as an example of the absorbent article which concerns on this embodiment. It is the schematic plan view which looked at the diaper 1 of the unfolding state from the skin side. It is a schematic perspective view which decomposes
  • FIG. 3 is an enlarged side view of a region of a printing unit 10 in a production line LM. It is the figure expanded and represented about the area
  • region M of FIG. 10A to 10C are diagrams illustrating a method for setting the transport position in the production line LM.
  • 11A and 11B are diagrams for describing a method of adjusting the skew (skew to the left side) of the low-extension continuous sheet 9A in the printing section.
  • 12A and 12B are diagrams for describing a method of adjusting the skew (skew to the right) of the low-extension continuous sheet 9A in the printing section.
  • 13A and 13B are diagrams specifically illustrating a method of changing the inclination of the rotation axis in the horizontal plane of the first transport roller CVp1.
  • An apparatus for manufacturing a sheet member according to an absorbent article wherein the sheet member is provided on a downstream side in the transport direction with respect to a first transport roller that transports the sheet member in a transport direction while supporting the sheet member.
  • a transport unit having a second transport roller, a support roller provided between the first transport roller and the second transport roller and supporting the sheet member, and the first transport roller,
  • a printing unit that prints an image by ejecting ink droplets onto the sheet member from an ink ejection device disposed between the second conveyance roller and the first conveyance roller being the sheet member.
  • the position where the support roller supports the sheet member is higher than the position where the support roller supports the sheet member, and the support roller is higher than the position where the second transport roller supports the sheet member.
  • the position where the roller supports the sheet member is higher, and the inclination of the rotation axis in the horizontal plane is changed with respect to at least one of the first conveyance roller and the second conveyance roller.
  • a sheet member manufacturing apparatus when an image is inkjet printed on a sheet member in an absorbent article manufacturing line, an appropriate tension is applied in the conveyance direction while preventing the sheet member from skewing.
  • the sheet member can be stably conveyed.
  • the landing positions of the ink droplets are difficult to shift, and an image with good image quality can be printed.
  • the transport unit includes a first support roller, a second support roller, and a third support roller arranged along the transport direction, The position where the second support roller supports the sheet member is higher than the position where the first support roller supports the sheet member, and the third support roller supports the sheet member. It is desirable that the position where the second support roller supports the sheet member is higher than the position.
  • a force in the thickness direction acts on the sheet member at a support point designated by the support roller, so that the sheet member can be conveyed while applying an appropriate tension. Therefore, the sheet member is prevented from being loosened or fluttering up and down during conveyance. This makes it easy to print an image with good image quality.
  • the printing unit includes a plurality of head units that discharge the ink droplets from the nozzles along the transport direction, and the support roller includes two different adjacent ones in the transport direction. It is preferable that the sheet member is provided at a position between the head units, and the sheet member is supported by being supported between the plurality of support rollers.
  • the sheet member manufacturing apparatus since the support interval in the conveyance direction of the sheet member is shortened, the sheet member being conveyed is hardly bent. Since printing is performed between the sheet members stretched between the support rollers, the landing positions of the ink droplets are less likely to shift, and it becomes easier to print an image with good image quality.
  • the sheet member has an inclination of a predetermined angle with respect to a horizontal plane in at least a partial region between the first transport roller and the second transport roller.
  • the head unit is arranged such that the nozzle surface is inclined according to the inclination so that the nozzle surface in which a plurality of the nozzles are arranged on the same plane and the sheet member are parallel to each other. It is desirable that
  • the distance between each of the plurality of nozzles provided on the nozzle surface of the head unit and the sheet member becomes equal. That is, the distance from the ejection of ink droplets from each nozzle to the landing on the sheet member becomes equal. This makes it difficult for the landing positions of the ink droplets to shift and makes it easy to print an image with good image quality.
  • complicated adjustment work is not required.
  • the support roller is disposed at a position not facing a nozzle row provided in the printing unit.
  • ink droplets ejected from nozzles are prevented from penetrating the sheet member in the thickness direction and adhering to the support roller.
  • the outer peripheral surface of a support roller becomes difficult to be contaminated with ink.
  • the support roller is rotationally driven by receiving power from a power source.
  • the sheet member manufacturing apparatus preferably has a cleaning mechanism that contacts the outer peripheral surface of the support roller and removes ink adhering to the outer peripheral surface.
  • the sheet member manufacturing apparatus even when ink adheres to the outer peripheral surface of the support roller, the sheet member is contaminated by the ink adhered to the support roller by performing cleaning. Can be suppressed.
  • an apparatus that performs a predetermined process on the sheet member is provided on the downstream side in the transport direction of the second transport roller, and the first transport roller It is desirable that the skew of the sheet member is adjusted by changing the inclination of the rotation axis in the horizontal plane.
  • the length of the sheet member wound around the second conveying roller is longer than the length of the sheet member wound around the first conveying roller in the conveying unit. The longer one is desirable.
  • a larger frictional force acts on the sheet member on the second conveyance roller side than the first conveyance roller.
  • a method for producing a sheet member comprising: ejecting ink droplets from a disposed ink ejection device onto the sheet member to print an image, wherein the first conveying roller supports the sheet member. The position where the support roller supports the sheet member is higher than the position, and the position where the second transport roller supports the sheet member.
  • the position where the support roller supports the sheet member is higher, and the inclination of the rotation axis in the horizontal plane is changed for at least one of the first transport roller and the second transport roller, whereby the sheet
  • the sheet member manufacturing method is characterized in that the skew of the member is adjusted.
  • FIG. 1 is a schematic perspective view of a pant-type diaper 1.
  • FIG. 2 is a schematic plan view of the unfolded diaper 1 as seen from the skin side.
  • FIG. 3 is a schematic perspective view showing the exploded diaper 1 in an exploded state.
  • skin side the side that should be located on the skin side of the wearer
  • the power side is simply called the “non-skin side”.
  • Diaper 1 is a so-called two-piece diaper. That is, the diaper 1 has an absorbent main body 3 that absorbs excreted fluid such as urine as a first component. And the non-skin side surface of the absorptive main body 3 is provided, and it has the planar view substantially hourglass-shaped exterior sheet 7 which makes the exterior of the diaper 1 as a 2nd component.
  • the absorbent main body 3 has an absorbent core 3c that absorbs excretory fluid.
  • the absorptive core 3c is formed by molding liquid absorptive fibers such as pulp fibers and liquid absorptive granular materials such as superabsorbent polymers into a predetermined shape (for example, a rectangular shape).
  • the skin side surface of the absorbent core 3c is provided with a liquid-permeable top sheet 4 such as a nonwoven fabric so as to cover the surface.
  • the non-skin side surface of the absorbent core 3c is provided with the surface.
  • a liquid-impermeable leak-proof sheet 5 such as a film is provided so as to cover the entire surface.
  • the exterior sheet 7 is a flexible sheet having a substantially hourglass shape in plan view in the unfolded state of FIG. 2, and the sheet 7 has a thickness direction, a longitudinal direction, and a width direction as three directions orthogonal to each other. ing.
  • the exterior sheet 7 is divided into three portions 7f, 7b, and 7c with respect to the longitudinal direction. That is, the exterior sheet 7 is formed on an abdominal side portion 7f disposed on the wearer's belly side, a back side portion 7b disposed on the wearer's back side, and a crotch portion 7c disposed on the wearer's crotch. It is divided.
  • the exterior sheet 7 is a composite sheet having an inner layer sheet 8 that forms an inner layer facing the wearer's skin when the diaper 1 is worn, and an outer layer sheet 9 that forms an outer layer facing the non-skin side when the diaper 1 is worn. is there.
  • the inner layer sheet 8 and the outer layer sheet 9 are bonded together by adhesion or welding while being overlapped in the thickness direction.
  • the joining portion between the inner layer sheet 8 and the outer layer sheet 9 is welded with a predetermined joining pattern (not shown) formed by discontinuous dispersion.
  • a stretchable sheet 8 having stretchability in the width direction of the diaper 1 is used as the material for the inner layer sheet 8.
  • the material for the outer layer sheet 9 low stretchability is low in the width direction of the diaper 1.
  • An extensible sheet 9 is used as the material for the outer layer sheet 9.
  • the stretchable inner layer sheet 8 is stretched in the width direction to a predetermined stretch ratio such as 2.5 times the natural length (hereinafter also referred to as the stretched state).
  • the stretch is also low stretch in the state stretched in the width direction.
  • the sheet 8 and 9 are superposed on the outer layer sheet 9 and fixed integrally with the above-mentioned bonding pattern.
  • the inner layer sheet 8 shrinks in the width direction of the diaper 1 based on its own stretchability.
  • the low stretchable outer layer sheet 9 has a plurality of hooks.
  • the diaper 1 is bent in the width direction, whereby the outer layer sheet 9 quickly follows the contraction of the inner layer sheet 8 to shorten the entire length in the width direction.
  • the outer sheet 7 is shortened in the width direction as a whole, and the outer surface of the outer sheet 7 is caused by bending of the outer layer sheet 9. It is in a state where there are multiple wings.
  • the exterior sheet 7 can be stretched approximately elastically until the wrinkle is fully extended, whereby the exterior sheet 7 of the diaper 1 It has become a specification with elasticity.
  • the term “stretchability” as used herein refers to the property that when an external force of tension is applied, it stretches approximately elastically in the direction of the external force and contracts approximately elastically when the external force is released. is there.
  • the stretchable sheet 8 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
  • the elongation (%) when pulled in the longitudinal direction by an external force is an arbitrary value in the range of 50% to 300%, and the residual elongation strain (%) that remains without contracting after the external force is released and contracted However, it is preferable that the value is an arbitrary value in the range of 0% to 40%.
  • the elongation rate is an arbitrary value in the range of 70% to 200%
  • the residual elongation strain is an arbitrary value in the range of 0% to 30%.
  • the above-mentioned elongation rate (%) is the natural length L0, which is the length of the belt-like sheet at the time of no load before being pulled, from the length L1 of the belt-like sheet when pulled with an external force of 1.0 (N).
  • the “low stretch sheet 9” is a stretch sheet lower than the stretch sheet 8 described above. That is, the stretch rate (%) when an external force of a predetermined tensile force is applied is lower than the stretch rate (%) of the stretchable sheet 8 described above.
  • the low-extensible sheet 9 desirably satisfies the following conditions. That is, in the state where both ends in the longitudinal direction of the belt-like sheet having a short dimension of 25 mm are equally gripped with the total length of 25 mm in the short direction, the both ends are each 1.0 (N) as a power point.
  • the elongation (%) when pulled in the longitudinal direction by an external force is preferably an arbitrary value in the range of 0% to 20%. More preferably, the elongation rate is an arbitrary value in the range of 0% to 10%.
  • the stretchable sheet 8 and the low-extensible sheet 9 are made of a nonwoven fabric.
  • the stretchable sheet 8 and the low stretchable sheet 9 may be composed of other sheets such as woven fabric.
  • the nonwoven fabric which can be utilized for the elastic sheet 8 it is appropriate to perform a gear stretching process or the like on a nonwoven fabric having a thermoplastic elastomer fiber exhibiting substantially elasticity and a thermoplastic resin fiber exhibiting substantially inelasticity.
  • Examples of the nonwoven fabric subjected to various stretching treatments That is, by performing such stretching treatment, if the substantially inelastic thermoplastic resin fibers contained in the nonwoven fabric are plastically deformed or the joints between the fibers are destroyed, the substantially elastic properties of the thermoplastic elastomer fibers can be reduced.
  • the non-woven fabric can be changed to a structure that hardly inhibits general stretch deformation, whereby the stretchability of the non-woven fabric is expressed and the stretchable sheet 8 can be used.
  • the stretchable sheet 8 Since such a stretchable sheet 8 is configured in a state where a plurality of fibers are randomly entangled, when viewed microscopically, the stretchable sheet 8 has a structure having a plurality of voids between the fibers. . And on the surface, there are a portion where the fibers are intertwined closely and a portion where the fibers are intertwined roughly. In other words, the stretchable sheet 8 has a structure having a density. Therefore, even when both ends of the elastic sheet 8 are gripped equally in the lateral direction and pulled in the longitudinal direction, the entire region in the lateral direction does not extend evenly, and is partially dense. Becomes larger, and a portion where the gap becomes larger is generated.
  • SMS nonwoven fabric, air-through nonwoven fabric and the like can be exemplified.
  • the fiber structure is not limited to a single fiber made of a single thermoplastic resin as described above.
  • the low-extension sheet 9 also has a structure having a plurality of voids between entangled fibers.
  • the absorbent main body 3 is joined at the joint portion J on the skin side of the exterior sheet 7.
  • seat 7 to which the absorptive main body 3 was attached is folded in half by the crotch part 7c, and the abdominal side part 7f and the back side part 7b are overlapped. Then, in this overlapped state, the abdomen side portion 7f and the back side portion 7b are joined at the respective end portions 7eW in the width direction, so that the waist opening HB as shown in FIG. It is made into the form of the underpants type diaper 1 in which the leg periphery opening parts HL and HL were formed.
  • an image G composed of predetermined characters, patterns, characters, and the like is printed on the exterior sheet 7 (see FIG. 1).
  • the image G improves the design on the appearance of the diaper 1 and allows the user to visually recognize information about the diaper 1 (for example, information indicating the product name and the front and back of the diaper 1). .
  • FIG. 4 is a schematic side view of a production line LM for producing the exterior sheet 7 constituting the diaper 1.
  • the production line LM uses as a material a continuous sheet 8A of the stretchable sheet 8 (hereinafter also referred to as a stretchable continuous sheet 8A) and a continuous sheet 9A of a low stretchable sheet 9 (hereinafter also referred to as a low stretchable continuous sheet 9A).
  • a continuous sheet 7A in which the exterior sheet 7 is continuous in the width direction hereinafter also referred to as an exterior continuous sheet 7A
  • the production line LM includes a transport mechanism CV, a printing unit 10, a drying unit 30, and a sheet member joining unit 50.
  • the transport mechanism CV is a transport unit that continuously transports the stretchable continuous sheet 8A (interior sheet 8), the low-extension continuous sheet 9A (exterior sheet 9), or both along a predetermined transport path.
  • a transport roller a suction belt conveyor having a suction holding function on a belt surface as a placement surface, or the like is used.
  • the low-extension continuous sheet 9A is transported in a line in the transport direction while aligning the direction corresponding to the width direction of the diaper 1 with the transport direction.
  • the stretchable continuous sheet 8A is also transported in a line in the transport direction while aligning the direction corresponding to the width direction of the diaper 1 with the transport direction.
  • the above-described transport direction set on the production line LM may be referred to as “MD direction”.
  • the MD direction can be different depending on the type of the sheet, and even the same sheet can be different depending on the conveyance place.
  • One of the two directions orthogonal to the MD direction may be referred to as a “CD direction”, and the other may be referred to as a “Z direction”.
  • the CD direction is a direction parallel to the width direction of each sheet, and is a direction perpendicular to the paper surface of FIG.
  • the Z direction is a direction parallel to the thickness direction of each sheet.
  • the printing unit 10 prints the image G on the low-extension continuous sheet 9A in the process in which the low-extension continuous sheet 9A is conveyed downstream in the MD direction by the conveyance mechanism CV.
  • the printing unit 10 of the present embodiment is an ink ejection device (inkjet printing device) that ejects ink droplets from a large number of nozzles Nz and forms an image G by ink droplets (dots) landed on the low-extension continuous sheet 9A.
  • the printing unit 10 includes a head unit 12 and a printing control unit 13.
  • FIG. 5 is a side view illustrating the configuration of the head unit 12 of the printing unit 10.
  • FIG. 6 is a diagram illustrating the arrangement of the head unit 121 and the nozzles Nz.
  • the head unit 12 has a plurality of nozzles Nz arranged in the CD direction, and is an ink ejection unit that ejects ink droplets from each nozzle Nz.
  • the printing unit 10 of the present embodiment four head units 12 are arranged along the MD direction, and each head unit 12 ejects yellow ink, magenta ink, cyan ink, and black ink, respectively.
  • the head unit 12 may be capable of ejecting a plurality of colors of ink. Further, the number of head units 12 arranged is not limited to four.
  • Each head unit 12 has a plurality of heads 121 arranged in the MD direction. In the example of FIG. 6, four heads 121 are arranged along the MD direction.
  • the head 121 has a plurality of short heads 121s arranged in a staggered pattern along the CD direction. In the example of FIG. 6, four short heads 121s are arranged along the CD direction.
  • the number of heads 121 provided in one head unit 12 and the number of short heads 121s provided in one head 121 are not limited to the example in FIG.
  • Each short head 121s has a plurality of nozzles Nz arranged in the CD direction. Thereby, the head unit 12 can discharge ink with respect to the whole area
  • each nozzle Nz is arrange
  • a plane on which the nozzles are arranged in the head unit 12 of the printing unit 10 is also referred to as a nozzle surface (see FIG. 5).
  • the ink droplet ejection method by the head 121 may be a piezoelectric method using a piezoelectric element, a thermal method using a heater, or another method.
  • the printing control unit 13 is a control unit that controls the operation of the printing unit 10. For example, the print control unit 13 controls the ejection timing and ejection amount of ink droplets ejected from the nozzles Nz of the head unit 12 by controlling the head unit 12.
  • the drying unit 30 is provided downstream of the printing unit 10 in the MD direction, and dries the ink by blowing dry air onto the extensible continuous sheet 9A on which the image G is printed.
  • the drying unit 30 includes a drying chamber 31, a conveyor belt 32, a plurality of air outlets 33, and a pressurizing chamber 34 (see FIG. 4).
  • the inside of the drying chamber 31 is kept at a high temperature, and the low-extension continuous sheet 9A is blown with dry air when passing through the drying chamber 31 in a state where it is adsorbed and held by the conveyor belt 32.
  • the dry air is air that has been dehumidified and heated to a predetermined temperature (for example, about 80 °), is supplied from the pressurization chamber 34, and is ejected from the blowout port 33.
  • the air outlet 33 is a slit-like opening in which an opening having a predetermined width in the MD direction extends in the CD direction, and uniform dry air (heating air) in the thickness direction toward the low-extension continuous sheet 9A. Can be erupted.
  • the drying unit 30 of the present embodiment as shown in FIG.
  • the plurality of air outlets 33 are opposed to the surface on which the image of the low-extension continuous sheet 9 ⁇ / b> A is printed (hereinafter also referred to as a printing surface). It can arrange
  • the dry air ejected from each outlet 33 flows from the lower side to the upper side in the thickness direction so as to penetrate the low-extension continuous sheet 9A, and heats the ink to the inside of the low-extension continuous sheet 9A. dry.
  • the closer to the printing surface the more ink is attached to the fibers. Therefore, the ink can be efficiently dried by blowing dry air from the printing surface side.
  • dry air may be blown from the opposite side (that is, from the upper side to the lower side).
  • the drying unit 30 may have other configurations. For example, while holding the low extensibility continuous sheet 9A on the outer peripheral surface of the rotating drum, the low extensibility continuous sheet is sucked into the drum from the air blown from a plurality of outlets arranged around the drum.
  • a drum-type drying device that allows dry air to pass in the thickness direction of the sheet 9A may be used.
  • the sheet member joining section 50 superimposes and joins the stretchable continuous sheet 9A on which the image G is printed with the stretchable continuous sheet 8A in the thickness direction to generate the exterior continuous sheet 7A.
  • the sheet member joining portion 50 is an ultrasonic welding device having an anvil roller 51 and an ultrasonic horn 52 (see FIG. 4).
  • the anvil roller 51 includes a stretchable continuous sheet 8A that is stretched in the MD direction at a predetermined stretch ratio (for example, 2.5 times the natural length), and a stretched state in the MD direction (a tension that does not cause plastic deformation). And a low-extension continuous sheet 9 ⁇ / b> A in a state in which is provided.
  • the stretchable continuous sheet 8A and the low stretchable continuous sheet 9A are wound around the outer peripheral surface of the anvil roller 51 in a state where the stretchable continuous sheet 8A and the low stretchable continuous sheet 9A are overlapped in the thickness direction.
  • the extensible continuous sheet 9A is welded when passing through the ultrasonic horn 52, and the exterior continuous sheet 7A is generated.
  • the stretchable continuous sheet 8A is joined to the surface opposite to the printing surface (the surface on which the image is printed) of the low stretchable continuous sheet 9A.
  • the printing surface of the low-extension continuous sheet 9A is disposed on the opposite side of the stretchable continuous sheet 8A, so that the printing surface of the low-extension continuous sheet 9A is the non-skin side of the exterior sheet 7 of the diaper 1, that is, Since it is arranged on the outermost surface (outermost surface) of the diaper 1 (see FIG. 3), the image G of the exterior sheet 7 of the diaper 1 can be visually recognized in a colorful manner.
  • FIG. 7 is a process explanatory diagram from the generation of the exterior continuous sheet 7A to the completion of the diaper 1.
  • the production line LM forms an opening in the exterior continuous sheet 7A that serves as a leg-hole opening HL (see FIG. 1). This opening is formed by being punched from the exterior continuous sheet 7A by an annular cutter blade (not shown).
  • the exterior continuous sheet 7A that has been conveyed in the stretched state is contracted in the MD direction. Thereby, wrinkles are formed on the outer surface of the exterior continuous sheet 7A.
  • the absorptive main body 3 is attached between the leg openings HL of the exterior continuous sheet 7A, and the exterior continuous sheet 7A is folded in two.
  • An end seal portion (end portion 7eW in FIG. 1) is formed by welding in the CD direction from the leg opening HL of the exterior continuous sheet 7A folded in half, and the exterior continuous sheet 7A is divided and separated at the end seal portion. Part becomes diaper 1.
  • the printing unit 10 performs ink jet printing by ejecting ink droplets to land on the low-extension continuous sheet 9A conveyed in the MD direction.
  • the stretchable continuous sheet 9A being conveyed vibrates up and down in the thickness direction, or if the conveying direction is skewed, the landing positions of the ink droplets shift and the image quality of the printed image deteriorates. There is a risk. Therefore, in order to print an image with good image quality, the low-extension continuous sheet 9A needs to be stably conveyed along the conveyance direction.
  • FIG. 8 is an enlarged side view of the area of the printing unit 10 in the production line LM.
  • FIG. 9 is an enlarged view of the region M in FIG.
  • a section surrounded by a broken line in FIG. 8 in the production line LM is also referred to as a “print section” for convenience.
  • the low-extension continuous sheet 9A is provided by the first transport roller CVp1 of the transport mechanism CV and the second transport roller CVp2 provided on the downstream side in the transport direction (MD direction) from the first transport roller CVp1. It is conveyed in the MD direction.
  • Both the first transport roller CVp1 and the second transport roller CVp2 are rotationally driven by a driving force of a motor (not shown), thereby transporting the low-extension continuous sheet 9A to the downstream side in the MD direction at a predetermined speed.
  • the outer diameter D2 of the second transport roller CVp2 is larger than the outer diameter D1 of the first transport roller CVp1 (D2> D1). The reason for this will be described later.
  • a printing unit 10 (ink ejection device) is disposed between the first conveyance roller CVp1 and the second conveyance roller CVp2, and inkjet printing is performed while the low-extension continuous sheet 9A is conveyed through the printing section. .
  • a plurality of support rollers for supporting the low-extension continuous sheet 9A are provided between the first transport roller CVp1 and the second transport roller CVp2.
  • a first support roller Sr1, a second support roller Sr2, and a third support roller Sr3 are provided along the MD direction.
  • the height (vertical height) of the position where each support roller supports the low-stretch continuous sheet 9A is higher than the height of the position where the first transport roller CVp1 supports the low-stretch continuous sheet 9A. It is high.
  • the height (vertical height) at which each support roller supports the low-stretch continuous sheet 9A is higher than the height at which the second transport roller CVp2 supports the low-stretch continuous sheet 9A. ing.
  • the point at which the low-stretch continuous sheet 9A is supported by the first transport roller CVp1 is a support point S1
  • the point at which the low-stretch continuous sheet 9A is supported by the second transport roller CVp2 is a support point S2.
  • the point where the low extensibility continuous sheet 9A is supported by the first support roller Sr1 is a support point S3
  • the point where the low extensibility continuous sheet 9A is supported by the second support roller Sr2 is a support point S4.
  • a point where the low-extension continuous sheet 9A is supported by Sr3 is defined as a support point S5.
  • the heights of the support points S3, S4 and S5 are higher than the height of the support point S1 and higher than the height of the support point S2. Further, the height of the support point S4 is higher than the height of the support point S3 and higher than the height of the support point S5.
  • the tension in the MD direction acts between the support points S1 and S2 on the low extensibility continuous sheet 9A.
  • a force including a component on the upper side in the vertical direction (force in the thickness direction) is applied by the support points S3 to S5.
  • moderate tension acts on the low-extension continuous sheet 9A throughout the printing section to suppress loosening and flapping during conveyance, so that the low-extension continuous sheet 9A can be stably conveyed.
  • each of the support rollers Sr1 to Sr3 is disposed between two different head units 12 and 12 arranged adjacent to each other in the MD direction. That is, the low extensibility continuous sheet 9A is conveyed in the MD direction while being supported so as to be bridged between the support rollers. Thereby, since the support space
  • the number of support rollers arranged in the printing section may be increased.
  • three support rollers Sr4, Sr5, and Sr6 are provided between the first support roller Sr1 and the second support roller Sr2.
  • the support rollers Sr4, Sr5, and Sr6 are all arranged at positions that do not face the nozzle row (head 121) of the head unit 12. This is because the low-extension continuous sheet 9A is a nonwoven fabric, and thus ink droplets are prevented from passing between the fibers of the nonwoven fabric and adhering to the support roller.
  • a cleaning mechanism for removing ink attached to the outer peripheral surface of the support roller may be provided for each support roller.
  • the cleaning mechanism 40 is provided on the lower side in the vertical direction of each support roller.
  • the cleaning mechanism 40 includes a wiping unit 41 that wipes off ink adhering to the outer peripheral surface of the support roller, and a moving unit 42.
  • the wiping portion 41 is a cloth-like or brush-like cleaning portion extending in the CD direction, and is moved up and down in the vertical direction by the moving portion 42.
  • the wiping portion 41 is normally disposed at a position where it does not come into contact with each support roller, and moves so as to come into contact with the outer peripheral surface of the support roller regularly or irregularly, and ink stains adhered to the outer peripheral surface. Wipe off.
  • the support roller is cleaned after a printing operation is continuously performed for a predetermined time or at an arbitrary timing. Thereby, it is suppressed that the low extensibility continuous sheet 9A is contaminated by the ink adhering to the support roller.
  • the wiping part 41 and each support roller are not contacting at the time of normal conveyance, the conveyance operation
  • each of these support rollers may be driven to rotate by receiving a power from a power source such as a motor to convey the low-extension continuous sheet 9A in the MD direction. If it does in this way, since the force which conveys low extensibility continuous sheet 9A to MD direction can be made to act in a plurality of supporting points in a printing section, it can be made to act on low extensibility continuous sheet 9A. Accordingly, the concentrated local force is suppressed and the low-extension continuous sheet 9A can be more stably conveyed. However, each support roller may be passively rotated by contacting the low-extension continuous sheet 9A.
  • the installation angle of the head unit 12 of the printing unit 10 is adjusted according to the conveyance path of the low-extension continuous sheet 9A. Specifically, each head unit 12 is transported so that the nozzle surface of the head unit 12 is substantially parallel to the surface of the low-extension continuous sheet 9A that is transported while being inclined in an arch shape in the printing section. It is installed along the slope of For example, in FIG. 9, the low-extension continuous sheet 9A is supported between the first support roller Sr1 and the second support roller Sr2 so as to have an angle ⁇ with respect to the horizontal plane. In this case, the head unit 12 is also installed at an angle ⁇ with respect to the horizontal plane along the inclination.
  • the distances between the nozzles Nz of the four heads 121, 121, 121, 121 arranged in the MD direction and the low-extension continuous sheet 9A are equal. Supposing that the nozzle surface of the head unit 12 is horizontally arranged, the head 121 arranged on the most upstream side in the MD direction and the head 121 arranged on the most downstream side in the MD direction have a low nozzle Nz.
  • the distance between the stretchable continuous sheet 9A will be different. That is, since the flying distances of the ejected ink droplets are different, the landing positions of the ink droplets are liable to shift.
  • the ink droplets are landed on the low-extension continuous sheet 9A after being ejected from each nozzle Nz.
  • the distance to do is equal. Therefore, landing deviation of ink droplets is suppressed, and it becomes easy to print an image with good image quality. Further, since it is sufficient to install the head unit 12 at an angle, complicated adjustment work such as height adjustment for each head 121 is unnecessary.
  • the head unit 12 is installed so that the inclination angle of the nozzle surface with respect to the horizontal plane is 30 ° or less, more preferably 5 ° or less.
  • the support rollers are arranged so that the inclination angle of the conveyance path of the low-extension continuous sheet 9A is 30 ° or less, more preferably 5 ° or less.
  • a printing surface is formed on the upper side in the thickness direction of the low-extension continuous sheet 9A, and a large amount of undried ink is attached to the surface of the printing surface, so that it is conveyed to the printing surface side. It is difficult to install rollers and support rollers.
  • a stable transport operation can be realized without bringing a support roller or the like into contact with the printing surface side. .
  • the transfer position is set based on the end plate DR.
  • the end plate DR is a flat wall plate that stands upright in a direction perpendicular to the horizontal plane (vertical direction), and is provided parallel to the paper surface in FIG.
  • Each device such as the printing unit 10 and the transport mechanism CV is fixed to a predetermined position on the production line LM by being attached to the end plate DR.
  • FIGS. 10A to 10C are diagrams for explaining a method of setting the transport position in the production line LM.
  • a virtual center line is set at a position separated from the surface of the end plate DR by a predetermined distance h (see FIG. 10A). That is, the virtual center line is a straight line set on a plane parallel to the end plate DR.
  • the first transport roller CVp1 and the second transport roller CVp2 are attached to the end plate DR so that the center positions of the first transport roller CVp1 and the second transport roller CVp2 in the CD direction (rotational axis direction) overlap with the virtual center line ( (See FIG. 10B).
  • each transport roller is attached so that the distance between the center position and the surface of the end plate DR is h.
  • the center position in the CD direction when the low-extension continuous sheet 9A is conveyed coincides with the virtual center line.
  • the printing unit 10 is attached to the end plate DR so that the center position of the nozzle row in the CD direction overlaps the virtual center line (see FIG. 10C).
  • the CD direction length of the head 121 is 2L2
  • each head 121 is attached so that the distance between the center position and the surface of the end plate DR is h.
  • the center position in the CD direction during printing coincides with the virtual center line.
  • the center in the CD direction when the low-stretch continuous sheet 9A is transported coincides with the center in the CD direction at the time of printing, so that the transport position of the low-stretch continuous sheet 9A is accurately set along the virtual center line.
  • the low-extension continuous sheet 9A may be skewed with respect to the transport direction while repeating the printing operation. That is, there is a case where an inclination (displacement) occurs in the horizontal plane between the direction in which the low stretchable continuous sheet 9A is actually conveyed and the direction of the virtual center line.
  • a deviation occurs in the landing positions of ink droplets between the upstream side and the downstream side in the transport direction (particularly, the deviation in the CD direction becomes large), and the image quality of the printed image is deteriorated.
  • FIG. 11A shows a case where the low-extension continuous sheet 9A is skewed toward the end plate DR in the CD direction, that is, the low-extension continuous sheet 9A is skewed to the left in the horizontal plane.
  • FIG. 11B the inclination of the rotation axis in the horizontal plane of the first transport roller CVp1 is changed to the direction opposite to the skew direction. That is, the rotation axis is tilted to the right in the horizontal plane.
  • the force which inclines and conveys the low extension continuous sheet 9A to the right side in a horizontal surface acts, and skew is corrected.
  • the skew can be corrected by changing the inclination of the rotation axis in the horizontal plane of the second transport roller CVp2 to a direction opposite to the skew direction.
  • FIG. 12A shows a state in which the low-extension continuous sheet 9A is skewed to the side opposite to the end plate DR in the CD direction, that is, the low-extension continuous sheet 9A is skewed to the right side on the horizontal plane.
  • the inclination of the rotation axis in the horizontal plane of the first transport roller CVp1 is changed to the direction opposite to the skew direction. That is, in contrast to the case of FIG. 11B, the skew can be corrected by tilting the rotation axis to the left in the horizontal plane. Similarly, the skew can be corrected even if the inclination of the rotation axis in the horizontal plane of the second transport roller CVp2 is changed in the skew direction.
  • FIGS. 13A and 13B are diagrams specifically illustrating a method of changing the inclination of the rotation axis in the horizontal plane of the first transport roller CVp1.
  • FIG. 13A is a plan view of the first transport roller CVp1 as viewed from the downstream side toward the upstream side along the MD direction.
  • FIG. 13B is a plan view in a horizontal plane when the first transport roller CVp1 is viewed from the vertically upper side.
  • the first transport roller CVp1 is attached to the end plate DR by the support tool 21 and the attachment tool 22.
  • the support tool 21 is a member that rotatably supports the rotation shaft of the first transport roller CVp1.
  • the attachment tool 22 includes a flat plate-like attachment portion 221 and a support portion 222 provided orthogonal to the attachment portion 221, and is attached to the end plate DR by the attachment portion 221. And the upper surface part of the support tool 21 and the support part 222 of the attachment tool 22 are connected via the joint shaft 23.
  • the joint shaft 23 is disposed at the center position in the MD direction of the first transport roller CVp1 and at the center position in the CD direction (position overlapping the virtual center line), and the joint shaft 23 is used as a fulcrum.
  • the support 21 is rotatable with respect to the fixture 22 in a horizontal plane.
  • the support 21 supporting the first transport roller CVp1 is tilted with respect to the mounting tool 22 using the joint shaft 23 as a fulcrum. Rotate in the direction to be changed (see FIG. 13B). Thereby, 1st conveyance roller CVp1 becomes rotatable in a horizontal surface by using the center position of MD direction and CD direction as a fulcrum. Note that the support tool 21 and the attachment tool 22 are connected so that they do not move (do not rotate) with each other at normal times. Therefore, when changing the inclination of the rotation axis of the first transport roller CVp1, a dedicated adjustment is performed. Instruments are used.
  • the method of attaching the second transport roller CVp2 to the end plate DR and the method of changing the inclination of the rotation axis in the horizontal plane of the second transport roller CVp2 are performed in the same manner as the method described in FIGS. 13A and 13B.
  • a device that performs a predetermined process on the low-stretch continuous sheet 9 ⁇ / b> A such as a drying unit 30, on the downstream side in the MD direction of the printing unit 10.
  • a drying unit 30 on the downstream side in the MD direction of the printing unit 10.
  • the drying unit 30 Since the drying unit 30 is immediately disposed on the downstream side in the MD direction of the second transport roller CVp2, the skew in the upstream side in the MD direction (printing section) is inclined by tilting the rotation axis of the second transport roller CVp2 in the horizontal plane. Even if it can be adjusted, the conveyance of the low-extension continuous sheet 9A may be affected on the downstream side in the MD direction. On the other hand, if the skew of the low-extension continuous sheet 9A is adjusted by the first transport roller CVp1, skew is less likely to occur in the printing section on the downstream side in the MD direction. This is because it is easy to suppress the occurrence of skew even on the downstream side in the MD direction of the transport roller CVp2.
  • the outer diameter D2 of the second transport roller CVp2 is made larger than the outer diameter D1 of the first transport roller CVp1 (see FIGS. 4 and 8). Therefore, the length wound around the outer peripheral portion of the second transport roller CVp2 is likely to be longer than the length where the low-extension continuous sheet 9A is wound around the outer peripheral portion of the first transport roller CVp1. As a result, a greater frictional force acts on the low-extension continuous sheet 9A on the second conveyance roller CVp2 side than the first conveyance roller CVp1.
  • equipment such as the drying unit 30 is provided on the downstream side in the MD direction of the second transport roller CVp2, but the low-stretch continuous sheet 9A can be stably transported by the second transport roller CVp2. As a result, it becomes easy to carry out the drying process stably.
  • a so-called line printer type in which a head unit is fixed is used as an inkjet printing apparatus.
  • a serial type inkjet in which a head having a plurality of nozzles arranged in the MD direction reciprocates in the CD direction.
  • a printing device may be used.
  • the low-extension continuous sheet 9A is a printing medium.
  • the printing medium is not limited to this, and inkjet printing is performed on a printing medium (for example, a woven cloth) other than a nonwoven fabric. It may be done.
  • seat (low-extension continuous sheet 9A) which comprises the underpants type diaper 1 was a to-be-printed medium, with respect to the sheet
  • a step of heating the low-extension continuous sheet 9A may be provided before printing on the low-extension continuous sheet 9A by the printing unit 10. That is, a heating unit that heats the low extensibility continuous sheet 9 ⁇ / b> A may be provided on the upstream side in the MD direction of the printing unit 10.
  • a heating unit that heats the low extensibility continuous sheet 9 ⁇ / b> A may be provided on the upstream side in the MD direction of the printing unit 10.
  • the friction resistance of the image G can be improved.
  • the gaps are widened, the heated air can easily flow through the thickness direction of the low-extension continuous sheet 9A in the drying step after printing, and the drying of the ink can be promoted.
  • heating before printing may be performed step by step.
  • a preheating step may be provided as a pre-stage of the pre-printing heating step.
  • a cooling unit that cools the low-extension continuous sheet 9A may be provided on the downstream side in the MD direction of the drying step 30 and on the upstream side in the MD direction of the sheet member joint 50. Since the low-extension continuous sheet 9A is heated by being blown with dry air in the drying step 30, the low-extension continuous sheet 9A may be stretched due to a tension during conveyance, or the like, or the sheet member joining portion 50 When joining with the stretchable continuous sheet 8A, the elastomer component of the stretchable continuous sheet 8A may be destroyed. Then, it becomes easy to manufacture a higher quality sheet member (exterior continuous sheet 7A) by lowering the temperature of the low extensibility continuous sheet 9A to near normal temperature by the cooling unit.
  • Printing section (ink ejection device), 12 head units, 121 heads, 121s short head, 13 Print control unit, 21 Supporting tool, 22 Mounting tool, 221 Mounting part, 222 Supporting part, 23 Joint shaft, 30 Drying section, 31 Drying chamber, 32 Conveyor belt, 33 Air outlet, 34 Pressure chamber, 40 Cleaning mechanism, 41 Wiping unit, 42 moving unit, 50 sheet member joint, 51 anvil roller, 52 ultrasonic horn, LM production line, CV transport mechanism (transport part), CVp1 first transport roller, CVp2 second transport roller, Sr1 first support roller

Landscapes

  • Absorbent Articles And Supports Therefor (AREA)

Abstract

L'invention concerne un dispositif de fabrication d'élément de feuille qui comprend : une unité de transport qui comprend un premier rouleau de transport qui transporte l'élément de feuille dans une direction de transport tout en soutenant l'élément de feuille, un second rouleau de transport qui est placé en aval du premier rouleau de transport dans la direction de transport, et des rouleaux de support qui sont placés entre le premier rouleau de transport et le second rouleau de transport et qui soutiennent l'élément de feuille ; et une unité d'impression qui déverse des gouttelettes d'encre sur l'élément de feuille depuis un dispositif de déversement d'encre positionné entre le premier rouleau de transport et le second rouleau de transport et imprime une image. Une position dans laquelle les rouleaux de support soutiennent l'élément de feuille est plus haute qu'une position dans laquelle le premier rouleau de transport soutient l'élément de feuille, une position dans laquelle les rouleaux de support soutiennent l'élément de feuille est plus haute qu'une position dans laquelle le second rouleau de transport soutient l'élément de feuille, et l'inclinaison de l'élément de feuille est réglée par changement de l'inclinaison, dans le plan horizontal, d'un arbre de rotation d'au moins un du premier rouleau de transport et du second rouleau de transport.
PCT/JP2014/083133 2014-12-15 2014-12-15 Dispositif de fabrication d'élément de feuille, et procédé de fabrication d'élément de feuille WO2016098157A1 (fr)

Priority Applications (2)

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JP2015523329A JP5799191B1 (ja) 2014-12-15 2014-12-15 複合シートの製造装置、及び、複合シートの製造方法
PCT/JP2014/083133 WO2016098157A1 (fr) 2014-12-15 2014-12-15 Dispositif de fabrication d'élément de feuille, et procédé de fabrication d'élément de feuille

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Cited By (1)

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US11447893B2 (en) 2017-11-22 2022-09-20 Extrusion Group, LLC Meltblown die tip assembly and method

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CN111483857B (zh) * 2020-04-17 2021-10-01 重庆东登科技有限公司 卷材用正反向纠偏装置

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JP2000141618A (ja) * 1998-11-06 2000-05-23 Miyakoshi Printing Machinery Co Ltd インクジェットプリンタ
JP2006076784A (ja) * 2004-09-13 2006-03-23 Fuji Xerox Co Ltd 画像形成装置
JP2008126516A (ja) * 2006-11-21 2008-06-05 Dainippon Screen Mfg Co Ltd 画像記録装置
JP2008238629A (ja) * 2007-03-28 2008-10-09 Brother Ind Ltd インクジェット記録装置
JP2011235530A (ja) * 2010-05-10 2011-11-24 Canon Inc プリント装置
US20120026233A1 (en) * 2009-04-15 2012-02-02 Whitney Elaine Loper Counteracting expansion effects of moisture on media within fluid-ejection device
JP2012200875A (ja) * 2011-03-23 2012-10-22 Seiko Epson Corp 画像形成装置及び画像形成方法

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JP5277051B2 (ja) * 2009-04-03 2013-08-28 ユニ・チャーム株式会社 吸収性物品に係る複合シートの製造方法、及び製造装置
JP5557637B2 (ja) * 2010-07-27 2014-07-23 ユニ・チャーム株式会社 吸収性物品に係る連続シートの蛇行修正装置

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JP2000141618A (ja) * 1998-11-06 2000-05-23 Miyakoshi Printing Machinery Co Ltd インクジェットプリンタ
JP2006076784A (ja) * 2004-09-13 2006-03-23 Fuji Xerox Co Ltd 画像形成装置
JP2008126516A (ja) * 2006-11-21 2008-06-05 Dainippon Screen Mfg Co Ltd 画像記録装置
JP2008238629A (ja) * 2007-03-28 2008-10-09 Brother Ind Ltd インクジェット記録装置
US20120026233A1 (en) * 2009-04-15 2012-02-02 Whitney Elaine Loper Counteracting expansion effects of moisture on media within fluid-ejection device
JP2011235530A (ja) * 2010-05-10 2011-11-24 Canon Inc プリント装置
JP2012200875A (ja) * 2011-03-23 2012-10-22 Seiko Epson Corp 画像形成装置及び画像形成方法

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11447893B2 (en) 2017-11-22 2022-09-20 Extrusion Group, LLC Meltblown die tip assembly and method

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