WO2015079367A1 - Device and method for treating and applying pieces for making absorbent articles. - Google Patents

Device and method for treating and applying pieces for making absorbent articles. Download PDF

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Publication number
WO2015079367A1
WO2015079367A1 PCT/IB2014/066230 IB2014066230W WO2015079367A1 WO 2015079367 A1 WO2015079367 A1 WO 2015079367A1 IB 2014066230 W IB2014066230 W IB 2014066230W WO 2015079367 A1 WO2015079367 A1 WO 2015079367A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotation
pad
anvils
axis
pads
Prior art date
Application number
PCT/IB2014/066230
Other languages
French (fr)
Inventor
Matteo Piantoni
Valerio Soli
Original Assignee
Gdm S.P.A.
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 Gdm S.P.A. filed Critical Gdm S.P.A.
Publication of WO2015079367A1 publication Critical patent/WO2015079367A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H35/00—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers
    • B65H35/04—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators
    • B65H35/08—Delivering articles from cutting or line-perforating machines; Article or web delivery apparatus incorporating cutting or line-perforating devices, e.g. adhesive tape dispensers from or with transverse cutters or perforators from or with revolving, e.g. cylinder, cutters or perforators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15756—Applying tabs, strips, tapes, loops; Knotting the ends of pads
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15764—Transferring, feeding or handling devices; Drives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F15/00—Auxiliary appliances for wound dressings; Dispensing containers for dressings or bandages
    • A61F15/001—Packages or dispensers for bandages, cotton balls, drapes, dressings, gauze, gowns, sheets, sponges, swabsticks or towels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/24—Delivering or advancing articles from machines; Advancing articles to or into piles by air blast or suction apparatus
    • B65H29/241—Suction devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/332—Turning, overturning
    • B65H2301/3321—Turning, overturning kinetic therefor
    • B65H2301/33216—Turning, overturning kinetic therefor about an axis perpendicular to the direction of displacement and to the surface of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/33—Modifying, selecting, changing orientation
    • B65H2301/332—Turning, overturning
    • B65H2301/3322—Turning, overturning according to a determined angle
    • B65H2301/33222—90°
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/34—Suction grippers
    • B65H2406/345—Rotary suction grippers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/34—Suction grippers
    • B65H2406/345—Rotary suction grippers
    • B65H2406/3454—Rotary suction grippers performing oscillating movement during rotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/57—Diaper manufacture

Definitions

  • This invention relates to a device and a method for treating and applying pieces for making absorbent articles.
  • the device and method address the field of handling a continuous web of elasticized material used to make the elasticized waistbands of nappies for children or adults.
  • the device according to this invention orients the above- mentioned elasticized pieces before being applied along a continuous row of nappies being made up.
  • the known devices comprise a drum, rotating about a relative axis, which carries a plurality of anvils acting in conjunction with cutting means to divide the continuous web into individual pieces and a plurality of pads, each interposed between two respective anvils, which are able to receive the continuous web and retain the pieces made by dividing the continuous web.
  • the pads, as well as rotating around the axis of rotation of the above- mentioned drum are able to rotate about themselves, around a relative axis of rotation positioned along a direction which is radial to the axis of rotation of the drum, so as to orient the respective piece in a direction transversal to the direction of feeding the continuous row of nappies.
  • each pad must recover and annul the difference which usually exists between the feeding speed of the continuous web of elasticized material and the feeding speed of the continuous row of nappies along which the respective piece of elasticized material is applied to each nappy.
  • the distance between consecutive nappies consequently varies and, therefore, the distance between two consecutive zones of nappies on which the pieces of elastic material must be applied also varies. It follows, obviously, that the distance between two pieces of elasticized material also varies during their positioning along a continuous row of nappies being made up. It is known that to recover this difference in speed and adapt the device to changes in size, each pad is allowed to oscillate in a space defined between the two anvils between which it is interposed.
  • the aim of this invention is to provide a device and a method for treating and applying pieces for making absorbent articles which can overcome the above mentioned drawbacks, without the need to replace the entire device.
  • At least the specified aim is substantially achieved by a device for treating and applying pieces for making absorbent articles according to claim 1 and by a method for treating and applying pieces for making absorbent articles according to claim 7.
  • Figure 1 is a schematic perspective view of a device for treating and applying pieces for making absorbent articles according to this invention
  • Figure 2 is a front schematic view of the device of Figure 1 ;
  • Figure 3 is a side schematic view of the device of Figure 1 ;
  • FIGS 4 to 8 are schematic front views of different operating steps of the device according to this invention.
  • the numeral 1 denotes a device for treating and applying pieces 2 for making absorbent articles 3.
  • pieces refers to pieces of material designed to form the waistbands of nappies for children or adults.
  • the pieces 2 are obtained by cutting a continuous web 4 of material fed into the device 1 by a respective feeding station 5.
  • the continuous material can be of the elasticized type so as to make elasticized waistbands.
  • the device 1 comprises a plurality of anvils 6 and a plurality of pads 7, rotating about a same axis of rotation 6a.
  • the anvils 6 are mounted as one on a first wheel 8, the wheel rotating around the axis of rotation 6a. More specifically, in a preferred embodiment, the pads 7 are mounted as one on a second wheel 17, the wheel rotating around the same axis of rotation 6a.
  • the first and the second wheel 8, 17 are rotated by a same shaft 18 rotating around the axis of rotation 6a.
  • the anvils 6 are positioned equidistant from each other.
  • the angular distance between two successive anvils 6 defines a compartment 12 for housing a pad 7.
  • the anvils 6 are distributed uniformly around the axis of rotation 6a and define between them a plurality of housing compartments 12 each of which is designed to house a pad 7.
  • the anvils 6 keep a fixed radial distance relative to the axis of rotation 6a.
  • the anvils 6 also define respective surfaces, labelled 9 in the drawing, which act as counter-blades for cutting the continuous web 4 into pieces 2.
  • the device 1 comprises a cutting unit 10, preferably comprising a rotating roller equipped with one or more cutting means, which acts in conjunction with a respective surface 9 of the anvil 6 for cutting the continuous web 4 into pieces 2.
  • the cutting unit 10 and each of the anvils 6, when in the contact position relative to the same cutting unit 10, define a cutting station 1 1 positioned downstream of the station 5 for feeding the continuous web 4.
  • two consecutive pads 7 must define as smooth a surface as possible for the continuous web 4 to lie and be held down on and, at the moment of cutting, the anvil 6 must be positioned at this surface, which the web 4 is lying on.
  • the pads 7 are arranged in a respective initial position at which, together with the anvils 6, the respective surfaces on which the web 4 is lying on are continuous with each other.
  • the pads 7 During rotation of the pads 7 around the axis of rotation 6a, the pads 7 pass through the cutting station 1 1 at which the continuous web 4 is divided into pieces 2 each of which is held by a respective pad 7.
  • Each pad 7 has a respective surface 16 for retaining and releasing a respective piece 2.
  • the device 1 comprises an application station 13, positioned downstream of the cutting station 1 1 , at which the pads 7 apply the respective piece 2 along a line 14 for feeding the absorbent articles 3 being made up.
  • each pad 7 rotates about itself around a relative axis 7b of rotation which is radial to the axis of rotation 6a.
  • each pad 7 rotates about itself by at least 90° around the relative axis 7b of rotation. This allows the individual pieces 2 to be oriented, depositing them on the plane of the line 14 for feeding the absorbent articles 3, perpendicularly to the feeding of the web 4.
  • each pad 7 rotates about itself by a further 90° around the relative axis 7b of rotation to return to the configuration adopted in the cutting station 1 1 .
  • each pad 7 rotates about itself by at least 180° around the relative axis 7b.
  • each pad 7 could rotate about itself by 90° in the opposite direction to the first rotation performed. This allows the pad 7 to be positioned again in the initial configuration, resulting in an overall rotation of 0°.
  • the pads 7 move from the raised position to the initial position, adopted again at the cutting station 1 1 .
  • each pad 7 is movable along a direction radial to the axis of rotation 6a, that is, along the relative axis 7b of rotation.
  • each pad 7 is movable away from and towards the axis of rotation 6a and, therefore, relative to the shaft 18, along the relative axis 7b of rotation.
  • each pad 7 moves from the initial position to the raised position, away from the axis of rotation 6a, and from the raised position to the initial position towards the axis of rotation 6a.
  • doctor position means a position at which each pad 7 is positioned radially completely above the anvils 6.
  • the pad 7 is in a position furthest away from the axis of rotation 6a.
  • each pad 7 is in the raised position so that it is located in a position substantially tangential with the line 14 for feeding the absorbent articles 3.
  • each pad 7 is positioned between two respective starting anvils 6, one after the other, whilst downstream of the application station 13 the same pad 7 is positioned between two respective arrival anvils 6, one after the other, which are different from the starting anvils 6.
  • each pad 7, rotating around the first axis of rotation 6a raises and moves above at least one anvil 6, in particular above at least one of the two starting anvils 6, and positions itself in a respective compartment 12 defined by the two arrival anvils 6, different from the previous one.
  • each pad 7 is moved independently by the anvils 6 and is designed to position itself in a different housing compartment 12 between two successive, in particular consecutive, work cycles.
  • the device 1 has at least one free compartment 12, that is, not engaged by any pad 7, designed to house a respective pad 7 after it passes from the raised position to the initial position, downstream of the application station 13.
  • the device 1 before completing the work cycle, has at least two anvils 6 one after the other, designed to define a seat for the pad 7 which must return to the initial position.
  • the number of pads 7 of the device 1 differs from the number of anvils 6.
  • the number of pads 7 is less than the number of anvils 6. In an alternative embodiment not illustrated, the number of pads 7 is greater than the number of anvils 6.
  • each pad 7 has a first tangential speed v1 at the feeding station 5, and a second tangential speed v2 greater than the first speed v1 , at least at the respective application station 13.
  • the tangential or peripheral speeds V1 and V2 are determined by two variables which affect the dynamics of the device 1 , one variable is the angular speed ⁇ of the pad 7 and the other variable is the distance adopted by the latter in its position furthest away from the shaft 18, that is, in the position which allows the pad 7 to pass one or more anvils.
  • each pad 7 As shown in Figure 1 and as mentioned above regarding the possibility for each pad 7 to move during its rotation from a position in which it is positioned between two respective starting anvils 6 to reach a position in which it is positioned between two respective arrival anvils 6, one after the other, which are different from the starting anvils 6, it follows that between the feeding station 5 and at least just before the application station each pad 7, as well as moving away from the shaft 18, varies its angular speed ⁇ accelerating and decelerating and thereby passing the anvils which lie between these two, respective, starting and arrival points.
  • each pad 7 has a first angular speed con at the feeding station 5, and a second rotational speed cot2 greater than the first rotational speed cot-i , at least before the respective application station 13.
  • the pad 7 accelerates at least between the cutting station 1 1 and the application station 13 reaching a tangential speed coinciding with the tangential speed V2 and decelerates starting from the latter until positioning itself in a new seat defined by two successive anvils 6, at which it again adopts the tangential speed equal to that of the anvils 6 coinciding with the tangential speed V1 .
  • the average speed (jumt of rotation of the pads and the average speed urn of the anvils 6 are synchronised to allow each pad 7 to position itself in a different housing compartment 12 between two successive, in particular consecutive, work cycles.
  • the anvils 6 rotate at a constant speed, that is, at the first speed v1 , around the axis of rotation 6a, whilst each pad 7 accelerates at least between the cutting station 1 1 and the application station 13, to pass from the first to the second speed v1 and v2, and decelerates downstream of the application station 13 to return again to the first speed v1 , at the cutting station 1 1 .
  • each pad 7 has an average speed comt of rotation greater than the same speed comi of the anvils 6. This ensures that each pad 7 has a different compartment 12 at each work cycle.
  • each pad 7 has a different compartment 12 at each work cycle.
  • average speed of rotation comi of the anvils refers to the average speed of rotation at which the anvils 6 perform a complete work cycle rotating around the axis of rotation 6a.
  • average speed of rotation co m t of the pads refers to the average speed of rotation at which the pads 7 perform a complete work cycle rotating around the first axis of rotation 6a.
  • the device 1 comprises cam means 15 which are able to drive the pads 7 in their acceleration and deceleration around the axis of rotation 6a.
  • Each pad 7 performs from the respective initial and raised position, and vice versa, of each work cycle, at least one oscillation movement, generated by the accelerations and decelerations of the pad 7.
  • the oscillation is such as to move the pad 7 along a circular arc extending at least from a first compartment 12 defined by the starting anvils 6 to a second housing compartment 12, defined by the arrival anvils 6, different to the first compartment 12.
  • the pads 7 are mobile relative to the anvils 6.
  • the pad 7, for each work cycle performs at least three movements: a first rotational movement around the common axis of rotation 6a, a second rotational movement about itself around the relative axis 7b of rotation radial with respect to the common axis of rotation 6a, and a third movement moving away and/or towards the axis of rotation 6a. These three movement can be performed by the pad 7 independently of each other.
  • each pad 7 rotates about itself by at least 90° around the respective axis 7b to orient the surface 16 having the main longitudinal axis of extension positioned in a direction transversal to the feeding direction of the feed line 14.
  • each pad 7 rotates about itself by at least 90° around the respective axis 7b to orient the surface 16 having the main longitudinal axis of extension positioned in a direction parallel to the feeding direction of the feed line 14. This further rotation allows the pad to return to the initial position.
  • a shaft, not illustrated, having a helical profile or profiles of known type is associated with each pad 7 to perform the second rotational movement about itself around the relative axis 7b simultaneously with the third movement away from and towards the axis of rotation 6a.
  • each pad 7 performs the second movement and the third movement independently of each other.
  • the web 4 is fed, preferably continuously, by the feeding station 5.
  • the pads 7 So as to receive and retain the continuous web 4, the pads 7 have the respective retaining surfaces 16 oriented in such a way as to have the relative main longitudinal axis of extension positioned parallel to the direction of feeding the continuous web 4, as shown in Figure 4.
  • the pads 7 which receive the continuous web 4 are arranged in their initial position, that is, in a position wherein the pads 7 and the anvils 6 have the respective surfaces 9 and 16 to lie and be held down on continuous with each other.
  • pads 7 which receive the continuous belt 4 house in a respective compartment 12 defined by two respective starting anvils 6, and maintain that position until the continuous web 4 is divided into the above-mentioned pieces 2.
  • the pads 7 and the anvils 6 defining the housing compartment 12 are rotated around the axis of rotation 6a by the feeding station 5 towards the cutting station 1 1 at the first speed of rotation v1 .
  • the web 4 is divided into pieces 2 by the cutting unit 10 which acts on the contact surface 9 of a respective anvil 6.
  • the cutting unit 10 makes two consecutive cuts on the web 4, acting in conjunction with two anvils 6 consecutive with each other in the direction of rotation of the axis of rotation 6a, a single piece 2 is made, held by suction by the pad 7 housed in the compartment 12 defined by the two consecutive anvils 6.
  • the pad 7 starts its movement with respect to the anvil 6, during its rotation around the first axis of rotation 6a, as shown in Figure 5.
  • each pad 7 moves away in a direction radial to the axis of rotation 6a and, simultaneously, rotates about itself around the relative axis 7b to orient the pieces 2 in their application configuration, that is, in a transversal position relative to the feed line 14.
  • the anvils 6 continue to rotate around the first axis of rotation 6a at a constant speed of rotation, in particular the first speed v1 of feeding the web 4.
  • the pad 7 accelerates as described above and moves forward above at least one anvil 6, defining the housing compartment 12 in which it was positioned.
  • the pad 7 rotates around the axis of rotation 6a with a speed equal to the second feed speed v2 of the line 14 of absorbent articles 3.
  • the pad 7 is in a position substantially tangential with the line 14 for feeding the absorbent articles 3 and with the respective retaining surface 16 having the main longitudinal axis of extension positioned in a direction transversal to the feeding direction of the feed line 14, in such a way as to release and apply the piece 2 conveyed to a respective absorbent article 3 being made up.
  • the pad 7 has released the respective piece 2 it decelerates, as described above, to return to the first speed v1 of feeding the web 4, in this way completing its oscillation. After again reaching the first speed v1 , the pad 7 is positioned above the free compartment 12 designed to house it, which is different to the compartment 12 in which it was positioned in the cutting station 1 1 .
  • the pad 7 now moves close to the axis of rotation 6a in a radial direction and along the relative axis of rotation 7b into the free compartment 12 between two respective anvils 6, as shown in Figure 7.
  • the pad 7 rotates about itself around the relative axis 7b by 90° to return the respective retaining surface 16 with the relative main longitudinal axis of extension positioned in a direction parallel to the feeding direction of the web 4.
  • the pad 7 starts a new work cycle in a housing compartment 12 different from the work cycle described.
  • the pads can compensate for a greater spacing of two consecutive pieces arranged along the line for feeding the absorbent articles being made up. This allows changes to be made to the size of the absorbent article without making further modifications to the device. More specifically, the differences in speed between the feeding of the web and the feeding of the absorbent articles are compensated for by the oscillation of the pads which are positioned in different compartments in each work cycle.

Abstract

Described is a device for treating and applying pieces for making absorbent articles comprising a plurality of anvils (6) and a plurality of pads (7) both rotating about a same axis of rotation (6a); in particular, the anvils (6) are distributed uniformly around the axis of rotation (6a) and define between them a plurality of compartments (12) for housing the pads (7); each pad (7) performs a complete rotation around the common axis of rotation (6a) performing a work cycle for transferring from a cutting station (11) to an application station (13) a respective piece (2) and returning again to the cutting station (11); for each work cycle the average speed of rotation of the pads (7) is different to the average speed of rotation of the anvils (6) and between two successive work cycles each pad (7) has a different housing compartment (12) from the one occupied previously.

Description

DESCRIPTION
DEVICE AND METHOD FOR TREATING AND APPLYING PIECES FOR MAKING ABSORBENT ARTICLES.
Technical field
This invention relates to a device and a method for treating and applying pieces for making absorbent articles.
More specifically, the device and method address the field of handling a continuous web of elasticized material used to make the elasticized waistbands of nappies for children or adults.
More specifically, the device according to this invention orients the above- mentioned elasticized pieces before being applied along a continuous row of nappies being made up.
Background art
Normally, the known devices, of the type indicated above, comprise a drum, rotating about a relative axis, which carries a plurality of anvils acting in conjunction with cutting means to divide the continuous web into individual pieces and a plurality of pads, each interposed between two respective anvils, which are able to receive the continuous web and retain the pieces made by dividing the continuous web.
The pads, as well as rotating around the axis of rotation of the above- mentioned drum are able to rotate about themselves, around a relative axis of rotation positioned along a direction which is radial to the axis of rotation of the drum, so as to orient the respective piece in a direction transversal to the direction of feeding the continuous row of nappies.
Moreover, during their rotation, each pad must recover and annul the difference which usually exists between the feeding speed of the continuous web of elasticized material and the feeding speed of the continuous row of nappies along which the respective piece of elasticized material is applied to each nappy. It should also be noted that, upon changeover to a different size of the product, as well as the variations of the feeding speeds involved, the distance between consecutive nappies consequently varies and, therefore, the distance between two consecutive zones of nappies on which the pieces of elastic material must be applied also varies. It follows, obviously, that the distance between two pieces of elasticized material also varies during their positioning along a continuous row of nappies being made up. It is known that to recover this difference in speed and adapt the device to changes in size, each pad is allowed to oscillate in a space defined between the two anvils between which it is interposed.
However, since the extent of the arc available for the oscillation is predetermined and, relatively, not very large, beyond certain variations in speed of rotation and size of the product which should correspond to values of the angles or oscillation which are not permitted by the dimensions and architecture of the device it must be completely replaced.
Disclosure of the invention
The aim of this invention is to provide a device and a method for treating and applying pieces for making absorbent articles which can overcome the above mentioned drawbacks, without the need to replace the entire device.
At least the specified aim is substantially achieved by a device for treating and applying pieces for making absorbent articles according to claim 1 and by a method for treating and applying pieces for making absorbent articles according to claim 7.
Brief description of the drawings
The invention is described below with reference to the accompanying drawings, which illustrate a non-limiting embodiment of it and in which:
Figure 1 is a schematic perspective view of a device for treating and applying pieces for making absorbent articles according to this invention; Figure 2 is a front schematic view of the device of Figure 1 ;
Figure 3 is a side schematic view of the device of Figure 1 ;
Figures 4 to 8 are schematic front views of different operating steps of the device according to this invention.
Detailed description of preferred embodiments of the invention
With reference to Figures 1 to 3, the numeral 1 denotes a device for treating and applying pieces 2 for making absorbent articles 3.
More specifically, the term "pieces" 2 refers to pieces of material designed to form the waistbands of nappies for children or adults.
The pieces 2 are obtained by cutting a continuous web 4 of material fed into the device 1 by a respective feeding station 5.
The continuous material can be of the elasticized type so as to make elasticized waistbands.
The device 1 comprises a plurality of anvils 6 and a plurality of pads 7, rotating about a same axis of rotation 6a.
More specifically, in a preferred embodiment, the anvils 6 are mounted as one on a first wheel 8, the wheel rotating around the axis of rotation 6a. More specifically, in a preferred embodiment, the pads 7 are mounted as one on a second wheel 17, the wheel rotating around the same axis of rotation 6a.
The first and the second wheel 8, 17 are rotated by a same shaft 18 rotating around the axis of rotation 6a.
Preferably, the anvils 6 are positioned equidistant from each other.
The angular distance between two successive anvils 6 defines a compartment 12 for housing a pad 7.
In other words, the anvils 6 are distributed uniformly around the axis of rotation 6a and define between them a plurality of housing compartments 12 each of which is designed to house a pad 7.
The anvils 6 keep a fixed radial distance relative to the axis of rotation 6a. The anvils 6 also define respective surfaces, labelled 9 in the drawing, which act as counter-blades for cutting the continuous web 4 into pieces 2. The device 1 comprises a cutting unit 10, preferably comprising a rotating roller equipped with one or more cutting means, which acts in conjunction with a respective surface 9 of the anvil 6 for cutting the continuous web 4 into pieces 2.
During rotation of the second wheel 8, the cutting unit 10 and each of the anvils 6, when in the contact position relative to the same cutting unit 10, define a cutting station 1 1 positioned downstream of the station 5 for feeding the continuous web 4.
For the cut to be made correctly, two consecutive pads 7 must define as smooth a surface as possible for the continuous web 4 to lie and be held down on and, at the moment of cutting, the anvil 6 must be positioned at this surface, which the web 4 is lying on.
For this reason, from the feeding station 5 to the cutting station 10, the pads 7 are arranged in a respective initial position at which, together with the anvils 6, the respective surfaces on which the web 4 is lying on are continuous with each other.
During rotation of the pads 7 around the axis of rotation 6a, the pads 7 pass through the cutting station 1 1 at which the continuous web 4 is divided into pieces 2 each of which is held by a respective pad 7.
Each pad 7 has a respective surface 16 for retaining and releasing a respective piece 2.
Known suction means, which are not illustrated, are connected to the pads 7 to allow the retaining of the pieces 2 on the respective surfaces 16.
The device 1 comprises an application station 13, positioned downstream of the cutting station 1 1 , at which the pads 7 apply the respective piece 2 along a line 14 for feeding the absorbent articles 3 being made up.
In order to orient the pieces 2 according to a position transversal to the line 14 for feeding the absorbent articles 3, each pad 7 rotates about itself around a relative axis 7b of rotation which is radial to the axis of rotation 6a. Preferably, from the cutting station 1 1 to the application station 13, each pad 7 rotates about itself by at least 90° around the relative axis 7b of rotation. This allows the individual pieces 2 to be oriented, depositing them on the plane of the line 14 for feeding the absorbent articles 3, perpendicularly to the feeding of the web 4.
From the application station 13 to the cutting station 1 1 each pad 7 rotates about itself by a further 90° around the relative axis 7b of rotation to return to the configuration adopted in the cutting station 1 1 .
Consequently, for each work cycle, each pad 7 rotates about itself by at least 180° around the relative axis 7b.
In the same way, each pad 7 could rotate about itself by 90° in the opposite direction to the first rotation performed. This allows the pad 7 to be positioned again in the initial configuration, resulting in an overall rotation of 0°.
During rotation of the pads 7 around the axis of rotation 6a, they move from a respective initial lowered position, in particular close to the axis of rotation 6a, at the cutting station 1 1 , to a raised position, in particular away from the axis of rotation 6a, at the application station 13.
Downstream of the application station 13, the pads 7 move from the raised position to the initial position, adopted again at the cutting station 1 1 .
More specifically, from the initial position to the raised position, and vice versa, each pad 7 is movable along a direction radial to the axis of rotation 6a, that is, along the relative axis 7b of rotation.
More specifically, from the initial position to the raised position, and vice versa, each pad 7 is movable away from and towards the axis of rotation 6a and, therefore, relative to the shaft 18, along the relative axis 7b of rotation.
More specifically, each pad 7 moves from the initial position to the raised position, away from the axis of rotation 6a, and from the raised position to the initial position towards the axis of rotation 6a.
The term "raised position" means a position at which each pad 7 is positioned radially completely above the anvils 6.
Preferably, in the raised position, the pad 7 is in a position furthest away from the axis of rotation 6a.
In effect, at the application station 13, each pad 7 is in the raised position so that it is located in a position substantially tangential with the line 14 for feeding the absorbent articles 3.
In the initial position, the respective surfaces for the pads 7 and the anvils 6 to lie and be held down on are continuous with each other.
At the cutting station 1 1 , each pad 7 is positioned between two respective starting anvils 6, one after the other, whilst downstream of the application station 13 the same pad 7 is positioned between two respective arrival anvils 6, one after the other, which are different from the starting anvils 6. This is possible as each pad 7, rotating around the first axis of rotation 6a, raises and moves above at least one anvil 6, in particular above at least one of the two starting anvils 6, and positions itself in a respective compartment 12 defined by the two arrival anvils 6, different from the previous one.
In other words, for each work cycle each pad 7 is moved independently by the anvils 6 and is designed to position itself in a different housing compartment 12 between two successive, in particular consecutive, work cycles.
This is possible because when a pad 7 is positioned radially completely above the anvils 6 it is moved away radially by the shaft 18 by a stretch sufficient to allow it to pass the anvils without interfering with them.
More specifically, the device 1 has at least one free compartment 12, that is, not engaged by any pad 7, designed to house a respective pad 7 after it passes from the raised position to the initial position, downstream of the application station 13.
In other words, before completing the work cycle, the device 1 has at least two anvils 6 one after the other, designed to define a seat for the pad 7 which must return to the initial position. Advantageously, the number of pads 7 of the device 1 differs from the number of anvils 6.
More specifically, the number of pads 7 is less than the number of anvils 6. In an alternative embodiment not illustrated, the number of pads 7 is greater than the number of anvils 6.
As the speed of feeding the continuous web 4 differs from the speed of the line 14 feeding the absorbent articles 3 on which the respective pieces 2 are applied, each pad 7 has a first tangential speed v1 at the feeding station 5, and a second tangential speed v2 greater than the first speed v1 , at least at the respective application station 13.
In this regard, it should be noted that the tangential or peripheral speeds V1 and V2 are determined by two variables which affect the dynamics of the device 1 , one variable is the angular speed ω of the pad 7 and the other variable is the distance adopted by the latter in its position furthest away from the shaft 18, that is, in the position which allows the pad 7 to pass one or more anvils.
As shown in Figure 1 and as mentioned above regarding the possibility for each pad 7 to move during its rotation from a position in which it is positioned between two respective starting anvils 6 to reach a position in which it is positioned between two respective arrival anvils 6, one after the other, which are different from the starting anvils 6, it follows that between the feeding station 5 and at least just before the application station each pad 7, as well as moving away from the shaft 18, varies its angular speed ω accelerating and decelerating and thereby passing the anvils which lie between these two, respective, starting and arrival points.
More specifically, each pad 7 has a first angular speed con at the feeding station 5, and a second rotational speed cot2 greater than the first rotational speed cot-i , at least before the respective application station 13.
Due to the difference between the first and the second speeds con and cot2, the pad 7 accelerates at least between the cutting station 1 1 and the application station 13 reaching a tangential speed coinciding with the tangential speed V2 and decelerates starting from the latter until positioning itself in a new seat defined by two successive anvils 6, at which it again adopts the tangential speed equal to that of the anvils 6 coinciding with the tangential speed V1 .
It should therefore be noted that, in each work cycle, the average speed (jumt of rotation of the pads and the average speed urn of the anvils 6 are synchronised to allow each pad 7 to position itself in a different housing compartment 12 between two successive, in particular consecutive, work cycles.
In other words, during each work cycle, the anvils 6 rotate at a constant speed, that is, at the first speed v1 , around the axis of rotation 6a, whilst each pad 7 accelerates at least between the cutting station 1 1 and the application station 13, to pass from the first to the second speed v1 and v2, and decelerates downstream of the application station 13 to return again to the first speed v1 , at the cutting station 1 1 .
It follows that, during performance of each work cycle, each pad 7 has an average speed comt of rotation greater than the same speed comi of the anvils 6. This ensures that each pad 7 has a different compartment 12 at each work cycle.
In the embodiment (not illustrated) in which the number of pads 7 is greater than the number of anvils 6, the average speed of rotation comt during a work cycle of the pads 7 is less than the same average speed comi of the anvils 6. In this case, too, each pad 7 has a different compartment 12 at each work cycle.
The expression "average speed of rotation comi of the anvils" refers to the average speed of rotation at which the anvils 6 perform a complete work cycle rotating around the axis of rotation 6a.
The expression "average speed of rotation comt of the pads" refers to the average speed of rotation at which the pads 7 perform a complete work cycle rotating around the first axis of rotation 6a.
The device 1 comprises cam means 15 which are able to drive the pads 7 in their acceleration and deceleration around the axis of rotation 6a.
Each pad 7 performs from the respective initial and raised position, and vice versa, of each work cycle, at least one oscillation movement, generated by the accelerations and decelerations of the pad 7. The oscillation is such as to move the pad 7 along a circular arc extending at least from a first compartment 12 defined by the starting anvils 6 to a second housing compartment 12, defined by the arrival anvils 6, different to the first compartment 12.
As the anvils 6 maintain their position relative to the axis of rotation 6a, the pads 7 are mobile relative to the anvils 6.
It should be noted that the pad 7, for each work cycle, performs at least three movements: a first rotational movement around the common axis of rotation 6a, a second rotational movement about itself around the relative axis 7b of rotation radial with respect to the common axis of rotation 6a, and a third movement moving away and/or towards the axis of rotation 6a. These three movement can be performed by the pad 7 independently of each other.
Advantageously, for each work cycle, two of the above-mentioned three movements occur simultaneously.
More specifically, during the movement of each pad 7 away from the axis of rotation 6a, the pad 7 rotates about itself by at least 90° around the respective axis 7b to orient the surface 16 having the main longitudinal axis of extension positioned in a direction transversal to the feeding direction of the feed line 14.
During the movement of each pad 7 towards the axis of rotation 6a, the pad 7 rotates about itself by at least 90° around the respective axis 7b to orient the surface 16 having the main longitudinal axis of extension positioned in a direction parallel to the feeding direction of the feed line 14. This further rotation allows the pad to return to the initial position.
A shaft, not illustrated, having a helical profile or profiles of known type is associated with each pad 7 to perform the second rotational movement about itself around the relative axis 7b simultaneously with the third movement away from and towards the axis of rotation 6a.
Alternatively, each pad 7 performs the second movement and the third movement independently of each other.
In use, the web 4 is fed, preferably continuously, by the feeding station 5. So as to receive and retain the continuous web 4, the pads 7 have the respective retaining surfaces 16 oriented in such a way as to have the relative main longitudinal axis of extension positioned parallel to the direction of feeding the continuous web 4, as shown in Figure 4.
The pads 7 which receive the continuous web 4 are arranged in their initial position, that is, in a position wherein the pads 7 and the anvils 6 have the respective surfaces 9 and 16 to lie and be held down on continuous with each other.
It should be noted that the pads 7 which receive the continuous belt 4 house in a respective compartment 12 defined by two respective starting anvils 6, and maintain that position until the continuous web 4 is divided into the above-mentioned pieces 2.
The pads 7 and the anvils 6 defining the housing compartment 12 are rotated around the axis of rotation 6a by the feeding station 5 towards the cutting station 1 1 at the first speed of rotation v1 .
At the cutting station 1 1 , the web 4 is divided into pieces 2 by the cutting unit 10 which acts on the contact surface 9 of a respective anvil 6.
Once the cutting unit 10 makes two consecutive cuts on the web 4, acting in conjunction with two anvils 6 consecutive with each other in the direction of rotation of the axis of rotation 6a, a single piece 2 is made, held by suction by the pad 7 housed in the compartment 12 defined by the two consecutive anvils 6.
Once the piece 2 has been made from the web 4, the pad 7 starts its movement with respect to the anvil 6, during its rotation around the first axis of rotation 6a, as shown in Figure 5.
As stated above, each pad 7 moves away in a direction radial to the axis of rotation 6a and, simultaneously, rotates about itself around the relative axis 7b to orient the pieces 2 in their application configuration, that is, in a transversal position relative to the feed line 14.
As mentioned previously, the rotation about itself of the pad 7 around the relative axis 7b occurs simultaneously with the moving away of the axis of rotation 6a, along the relative axis 7b, as each pad 7 is rotatably coupled to a respective shaft, not illustrated.
It should be noted that, downstream of the cutting station 1 1 and upstream of the application station 13, each pad 7, after it has moved away from the axis of rotation 6a until being positioned above the anvils 6, starts to accelerate to pass from the first speed v1 to the second speed v2, moving forward above the anvils 6.
More specifically, when the pad 7 starts to accelerate, the anvils 6 continue to rotate around the first axis of rotation 6a at a constant speed of rotation, in particular the first speed v1 of feeding the web 4.
To reach the second speed v2, the pad 7 accelerates as described above and moves forward above at least one anvil 6, defining the housing compartment 12 in which it was positioned.
At the application station 13, the pad 7 rotates around the axis of rotation 6a with a speed equal to the second feed speed v2 of the line 14 of absorbent articles 3.
More specifically, as shown in Figure 6, at the application station 13, the pad 7 is in a position substantially tangential with the line 14 for feeding the absorbent articles 3 and with the respective retaining surface 16 having the main longitudinal axis of extension positioned in a direction transversal to the feeding direction of the feed line 14, in such a way as to release and apply the piece 2 conveyed to a respective absorbent article 3 being made up.
Once the pad 7 has released the respective piece 2 it decelerates, as described above, to return to the first speed v1 of feeding the web 4, in this way completing its oscillation. After again reaching the first speed v1 , the pad 7 is positioned above the free compartment 12 designed to house it, which is different to the compartment 12 in which it was positioned in the cutting station 1 1 .
The pad 7 now moves close to the axis of rotation 6a in a radial direction and along the relative axis of rotation 7b into the free compartment 12 between two respective anvils 6, as shown in Figure 7.
During the movement of the pad 7 towards the axis of rotation 6a, the pad 7 rotates about itself around the relative axis 7b by 90° to return the respective retaining surface 16 with the relative main longitudinal axis of extension positioned in a direction parallel to the feeding direction of the web 4.
The rotation about itself of the pad 7 around the relative axis 7b during the movement towards the axis of rotation 6a is possible as the pad 7 is rotatably coupled to the respective shaft, not illustrated.
It should be noted that the pad 7 starts a new work cycle in a housing compartment 12 different from the work cycle described.
This is because the pad 7 moves away from the axis of rotation 6a positioning itself along a circular arc having a diameter greater than the circumference defined by the contact surface 9 of the anvils 6. This allows the pad 7 to accelerate and decelerate above one or more anvils 6 and pass from the first speed v1 to the second speed v2 and vice versa.
In fact, it should be noted that, compared with the prior art, the pads can compensate for a greater spacing of two consecutive pieces arranged along the line for feeding the absorbent articles being made up. This allows changes to be made to the size of the absorbent article without making further modifications to the device. More specifically, the differences in speed between the feeding of the web and the feeding of the absorbent articles are compensated for by the oscillation of the pads which are positioned in different compartments in each work cycle.

Claims

1 . A device for treating and applying pieces for making absorbent articles, the pieces (2) being made by cutting a continuous web (4);
the device comprising
a plurality of anvils (6) and a plurality of pads (7) rotating about a same axis (6a) of rotation;
the anvils (6) being distributed around the axis (6a) of rotation and defining between them a plurality of compartments (12) for housing the pads (7); a station (1 1 ) for cutting the continuous web (4) into the pieces (2) and a station (13) for applying the pieces (2) along the absorbent articles (3); each pad (7) completing a work cycle, by performing a complete rotation around the axis (6a) of rotation, for transferring a respective piece (2) from the cutting station (1 1 ) to the application station (13) and returning again to the cutting station (1 1 );
the device comprises cam means (15) which are able to drive the pads (7) in a movement of acceleration and deceleration around the axis of rotation (6a),
each pad (7) being movable between an initial lowered position close to the axis of rotation (6a) at the cutting station (1 1 ) and a raised position away from the axis of rotation (6a) at the application station (13), the device characterised in that
in the raised position each pad (7) is positioned radially completely above the anvils (6), each pad (7) being positioned, at the cutting station (1 1 ), between two respective starting anvils (6), one after the other, each pad (7) being positioned, downstream of the application station (13), between two respective arrival anvils (6), one after the other, the starting anvils (6) being different, for each pad (7), from the respective starting anvils (6), the cam means being configured to impart to each pad (7), between the respective initial lowered portion and the raised portion, in each work cycle, at least an oscillation movement along a circular arc extending at least from a first housing compartment (12) defined between the starting anvils (6) to a second housing compartment (12), defined by the arrival anvils (6), different to the first compartment (12).
2. The device according to claim 1 , wherein the device has at least one of the compartments (12) free and designed to house a respective pad (7) following passage of the pad (7) from the raised position to the initial lowered position .
3. The device according claim 1 or 2, characterised in that the number of pads (7) is different from the number of anvils (6).
4. The device according to any one of the preceding claims, characterised in that the number of pads (7) is less than the number of anvils (6).
5. The device according to any one of the preceding claims, characterised in that the cam means (15) are configured in such a way that for each work cycle an average speed (comt) of rotation of the pads (7) is different to the average speed (comi) of rotation of the anvils (6); each pad (7) being positioned in a different housing compartment (12) in two consecutive work cycles.
6. The device according to any one of the preceding claims, characterised in that the cam means (15) are configured in such a way that, in each work cycle, an average speed (comt) of rotation of the pads (7) and average speed (comi) of the anvils (6) are synchronised to allow each pad (7) to be positioned in a different housing compartment (12) in two consecutive work cycles.
7. A method for treating and applying pieces for making absorbent articles, the pieces (2) being made by cutting a continuous web (4) using a device for treating and applying pieces for making absorbent articles comprising a plurality of anvils (6) and a plurality of pads (7) rotating about a same axis (6a) of rotation;
the anvils (6) being distributed uniformly around the axis (6a) of rotation and defining between them a plurality of compartments (12) for housing the pads (7);
a station (1 1 ) for cutting the continuous web (4) into the pieces (2) and a station (13) for applying the pieces (2) along the absorbent articles (3); each pad (7) completing a work cycle, by performing a complete rotation around the axis (6a) of rotation, for transferring a respective piece (2) from the cutting station (1 1 ) to the application station (13) and returning again to the cutting station (1 1 );
the method being characterised in that
for each work cycle the average speed (comt) of rotation of the pads (7) is different to the average speed (comi) of rotation of the anvils (6); each pad (7) being positioned in a different housing compartment (12) in two consecutive work cycles.
8. The method according to claim 7, characterised in that, in each work cycle, the average speed (comt) of rotation of the pads (7) is greater than the average speed (comi) of rotation of the anvils (6).
9. The method according to claim 7 or 8, characterised in that, in each work cycle, the average speed (comt) of rotation of the pads and the average speed (comi) of the anvils (6) are synchronised to allow each pad (7) to position itself in a different housing compartment (12) between two consecutive work cycles.
10. The method according to any one of claims 7 to 9, characterised in that at the cutting station (1 1 ) each pad (7) has a first tangential speed
(v1 ) and at the application station (13) the pad (7) has a second tangential speed (v2) greater than the first speed (v1 ); the pad (7) accelerating at least between the cutting station (1 1 ) and the application station (13).
1 1 . The method according to any one of claims 7 to 10, characterised in that from the cutting station (1 1 ) to the application station (13) each pad
(7) rotates by at least 90° around the relative axis (7b) of rotation radial with respect to the common axis of rotation (6a).
12. The method according to any one of claims 7 to 1 1 , characterised in that during the rotation around the axis (6a) of rotation the anvils (6) maintain their respective position with respect to the common axis of rotation (6a) and at a constant speed of rotation (v1 ).
13. The method according to any one of claims 7 to 12, characterised in that, for each work cycle, each pad (7) performs a first rotational movement around the common axis of rotation (6a), a second rotational movement about itself around the relative axis (7b) of rotation radial with respect to the common axis of rotation (6a), and a third movement moving away and/or towards the axis (6a) of rotation.
14. The method according to claim 13, characterised in that each pad (7) performs the first, the second and the third movement each independently of the other.
15. The method according to claim 13, characterised in that each pad (7) performs at least two of the first, second and third movements simultaneously.
PCT/IB2014/066230 2013-11-27 2014-11-21 Device and method for treating and applying pieces for making absorbent articles. WO2015079367A1 (en)

Applications Claiming Priority (2)

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IT000654A ITBO20130654A1 (en) 2013-11-27 2013-11-27 TREATMENT AND APPLICATION DEVICE FOR PACKAGING OF ABSORBENT ITEMS.
ITBO2013A000654 2013-11-27

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