WO2020254929A1 - Device for forming an absorbent pad for an absorbent sanitary article - Google Patents

Device for forming an absorbent pad for an absorbent sanitary article Download PDF

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Publication number
WO2020254929A1
WO2020254929A1 PCT/IB2020/055532 IB2020055532W WO2020254929A1 WO 2020254929 A1 WO2020254929 A1 WO 2020254929A1 IB 2020055532 W IB2020055532 W IB 2020055532W WO 2020254929 A1 WO2020254929 A1 WO 2020254929A1
Authority
WO
WIPO (PCT)
Prior art keywords
seat
depth
absorbent
along
absorbent core
Prior art date
Application number
PCT/IB2020/055532
Other languages
French (fr)
Inventor
Marco Rosani
Federico TOSCANI
Matteo Piantoni
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 WO2020254929A1 publication Critical patent/WO2020254929A1/en

Links

Classifications

    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
    • A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
    • A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
    • 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
    • A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
    • A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
    • 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
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
    • A61F13/536—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes having discontinuous areas of compression

Definitions

  • This invention relates to a device for forming an absorbent core for an absorbent sanitary article.
  • the absorbent core also known in the trade as "core” is intended for use in making absorbent sanitary articles such as, for example, nappies for children and adults, to which express reference is hereinafter made without losing in generality, sanitary towels and the like.
  • the absorbent core is made using a forming drum which is rotatable about its own axis of rotation and whose peripheral surface confronts a feed hood for feeding the absorbent material.
  • the peripheral surface of the drum is provided with one or more seats for receiving and retaining the absorbent material used to make the absorbent core.
  • Each seat has a bottom surface on which the absorbent material is deposited and side walls for containing the absorbent material.
  • the shape of the seat determines the method of distributing the absorbent material inside it and, consequently, the response to the absorption of the liquid by the absorbent core.
  • the device comprises a forming drum, rotatable about its own axis of rotation, having a peripheral surface equipped with at least one seat for forming the absorbent core.
  • the seat has a main longitudinal axis of extension, parallel to the circumferential direction of extension of the peripheral surface of the drum.
  • the seat has a bottom surface and a lateral surface for containing the absorbent material defining the shape of the absorbent core made there.
  • the lateral surface of the seat has a first side and a second side, extending parallel to the longitudinal axis of the seat.
  • the bottom surface has at least a first portion, having a first depth, and a second portion, having at least a second depth greater than the first depth;
  • the second portion has a sequence of cavities for accumulating absorbent material, and protrusions for preventing accumulation of absorbent material, positioned one alternating with the other.
  • Each cavity has a respective bottom surface defining the second depth of the bottom surface of the seat.
  • the second portion of the bottom surface of the seat comprises a first cavity located adjacent to the first side and a second cavity adjacent to the second side.
  • the particular shape of the bottom surface of the seat makes it possible to increase the efficiency of absorbing the liquids of the absorbent core made in it compared with the prior art.
  • Figure 1 is a schematic front view of a device for forming an absorbent core for an absorbent sanitary article according to the invention
  • Figure 2 is a schematic perspective view of a detail of the device of Figure 1 ;
  • Figure 3 is a schematic view from above of the detail of Figure 2;
  • Figure 4 is a first schematic cross-section of the detail of Figure 3;
  • Figure 5 is a second schematic cross-section of the detail of Figure 3.
  • the numeral 1 denotes a device for forming an absorbent core 100 for an absorbent sanitary article.
  • the device 1 comprises a forming drum 2, rotatable about its own axis 2a of rotation, having a peripheral surface 3 equipped with at least one seat 4 for forming the absorbent core 100.
  • a system 22 for feeding absorbent material is positioned facing at least part of the peripheral surface 3 of the drum 2.
  • the drum 2 has a suction chamber 24 configured to determine the retaining of the absorbent material in the seat 4.
  • the seat 4 has a main longitudinal axis 4a of extension, parallel to the circumferential direction of extension of the peripheral surface 3 of the drum 2
  • the seat 4 has a bottom surface 5 and a lateral surface 6 for containing the absorbent material designed to define the absorbent core 100, as shown in Figure 2.
  • the lateral surface 6 of the seat 4 has a first side 7 and a second side 8, positioned along a direction parallel to the longitudinal axis 6a.
  • the lateral surface 6 of the seat 4 has a third side 9 and a fourth side 10 positioned along a direction transversal to the longitudinal axis 6a.
  • the third side 9 of the seat 4 defines a front side of the absorbent core 100, with reference to the user.
  • the fourth side 10 of the seat 4 defines a rear side of the absorbent core 100, with reference to the user.
  • the shape of the sides of the seat 4, that is, of the first, second, third and fourth sides 7, 8, 9, 10, may have a rectilinear shape, see the first, second and third sides 7, 8 and 9, or a curvilinear shape, see the fourth side 10.
  • the bottom surface 5 has at least a first portion 1 1 , having a first depth, and a second portion 12, having at least a second depth greater than the first depth.
  • the first depth and the second depth are referred to the peripheral surface 3 of the drum 2.
  • the first portion 11 extends along at least a first stretch T1 of the length of the bottom surface 5, along a direction parallel to the longitudinal axis 4a of main extension, and along the entire width of the bottom surface 5, along a direction transversal to the longitudinal axis 4a of main extension, as illustrated in Figure 3.
  • the first portion 11 of the seat 4 comprises one or more inserts 20 which inhibit the action of the suction chamber, not illustrated, and prevent absorbent material from being deposited at each insert 20, thus creating a corresponding zone free of absorbent material inside the absorbent core 100.
  • the first portion 1 1 defines at least a central portion of the absorbent article.
  • the first portion 1 1 defines a central portion and a rear portion of the absorbent article, with reference to the user.
  • the first portion 1 1 comprises at least part of the first and second sides 7, 8 and the fourth side 10.
  • the second portion 12 is positioned adjacent to the first portion 1 1 , extending along at least a second stretch T2 of the length of the bottom surface 5 and along the entire width of the bottom surface, along a direction transversal to the longitudinal axis 4a of main extension, as illustrated in Figure 3.
  • the second portion 12 defines a front portion of the absorbent core 100, with reference to the user.
  • the second portion 12 comprises at least part of the first and second sides 7, 8 and the third side 9.
  • the first portion 11 and the second portion 12 are both delimited laterally by the first side 7 and by the second side 8.
  • the first portion 11 is delimited laterally by the first side 7 and by the second side 8.
  • the second portion 12 is delimited laterally by the first side 7 and by the second side 8.
  • the first portion 1 1 and the second portion 12 are positioned one after the other.
  • the second portion 12 has a sequence of cavities 13 for accumulating absorbent material, and protrusions 14 for preventing accumulation of absorbent material, positioned in sequence one alternating with the other.
  • Each cavity 13 has a respective bottom surface 15 defining the second depth of the second portion 12 of the bottom surface 5 of the seat 4.
  • Each protrusion 14 has a respective top surface 14a.
  • the top surface 14a of a respective protrusion 14 defines a third depth of the seat 4.
  • the third depth can be included in the interval defined between the first depth of the first portion 1 1 and the second depth of the second portion 12 or can be equal to the first depth of the first portion 1 1.
  • Each cavity 13 is connected to a respective protrusion 14 defining a continuous curvilinear, or rectilinear, profile, having respective troughs, at the cavities 13, and peaks, at the protrusions 14.
  • the cavities 13 and the protrusions 14 of the second portion 12 have a main extension along a direction parallel to the longitudinal axis 4a of the seat 4.
  • the second portion 12 of the bottom surface 5 of the seat 4 comprises a first cavity 16 located adjacent to the first side 7 and a second cavity 17 adjacent to the second side 8 (Ref. Figure 4).
  • first cavity 16 and the second cavity 17 are positioned at respective lateral ends of the seat 4, with reference to a direction transversal to the longitudinal axis 4a of the seat 4.
  • the union between the first portion 1 1 and the second portion 12 of the seat 4 allows a particular distribution of the absorbent material to be made which reacts more effectively to the absorption of liquids.
  • the device 1 comprises a first system 18 for feeding a first web NW1 to the forming drum 2.
  • the first web NW1 is held by suction on at least part of the peripheral surface 3 of the drum 2, depositing in the seat 4 in contact with the bottom surface 5.
  • the suction system 9 causes the absorbent material 3 to be distributed on the first web NW1 , positioned on the forming drum 4, inside the seat 6.
  • the device 1 comprises a second system 19 for feeding a second web NW2.
  • the second web NW2 is fed to the forming drum 4 downstream of the feed system 22 of the absorbent material.
  • the first web NW1 , the second web NW2 and the absorbent material 3 interposed between the webs NW1 and NW2 define a composite web NW, that is, a continuous succession of absorbent cores 100.
  • the device comprises a joining system 21 for joining the composite web NW and a cutting system 23 for cutting the composite web NW into individual pieces, each defining a single absorbent core 100.
  • the joining system 21 is configured to join the composite web NW at the first and second webs NW1 , NW2 to define the longitudinal edges and the transverse edges of the absorbent core 100.
  • the joining system 21 is configured to join the composite web NW at the first and the second layer NW1 , NW2 at the zones free of absorbent material defined by the presence of the inserts 20.
  • the joining system 21 may comprise welding means - for example, ultrasound welding means - or pressing means if an adhesive substance is interposed between the two webs NW1 , NW2 to join them to each other.
  • the first web NW1 is intended to form a first layer 101 of the absorbent core 100.
  • the second web NW2 is intended to form a second layer 102 of the absorbent core 100.
  • the thickness of the absorbent core 100 is variable from a minimum thickness, determined by the depth of the first portion 1 1 of the bottom surface 5 of the seat 4, to a maximum thickness, determined by the depth of the second portion 12 of the bottom surface 5 of the seat 4.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Manufacturing & Machinery (AREA)
  • Absorbent Articles And Supports Therefor (AREA)

Abstract

A device for forming an absorbent core of an absorbent sanitary article; the device comprises a forming drum (2), rotatable about its own axis (2a) of rotation, which has a peripheral surface (3) equipped with at least one seat (4) for forming the absorbent core (100); 5 the seat (4) has a bottom surface (5) and a lateral surface (6) for containing the absorbent material defining the shape of the absorbent core (100); the bottom surface (5) has at least a first portion (11), having a first depth, and a second portion (12), having at least a second depth 10 greater than the first depth; the second portion (12) has a sequence of cavities (13) for accumulating absorbent material, and protrusions (14) for preventing accumulation of absorbent material, positioned one alternating with the other; 15 each cavity (13) has a respective bottom surface (15) defining the second depth of the bottom surface (5) of the seat (4); the second portion (12) of the bottom surface (5) of the seat (4) comprises a first cavity (16) located adjacent to the first side (7) and a second cavity (17) adjacent to the second side (8). 20

Description

DEVICE FOR FORMING AN ABSORBENT PAD FOR AN ABSORBENT
SANITARY ARTICLE
Technical field
This invention relates to a device for forming an absorbent core for an absorbent sanitary article. Background art
The absorbent core, also known in the trade as "core", is intended for use in making absorbent sanitary articles such as, for example, nappies for children and adults, to which express reference is hereinafter made without losing in generality, sanitary towels and the like.
It is known that the absorbent core is made using a forming drum which is rotatable about its own axis of rotation and whose peripheral surface confronts a feed hood for feeding the absorbent material.
The peripheral surface of the drum is provided with one or more seats for receiving and retaining the absorbent material used to make the absorbent core.
Each seat has a bottom surface on which the absorbent material is deposited and side walls for containing the absorbent material.
The shape of the seat determines the method of distributing the absorbent material inside it and, consequently, the response to the absorption of the liquid by the absorbent core.
Disclosure of the invention
Laboratory tests have recently been carried out to simulate the distribution of liquids in an absorbent core of an absorbent article.
The results of these tests have allowed the method of distributing the absorbent material in an absorbent core to be defined in order to improve the absorption efficiency. In this context, a device has been developed for forming an absorbent core for an absorbent sanitary article.
The device comprises a forming drum, rotatable about its own axis of rotation, having a peripheral surface equipped with at least one seat for forming the absorbent core.
The seat has a main longitudinal axis of extension, parallel to the circumferential direction of extension of the peripheral surface of the drum. The seat has a bottom surface and a lateral surface for containing the absorbent material defining the shape of the absorbent core made there. The lateral surface of the seat has a first side and a second side, extending parallel to the longitudinal axis of the seat.
The bottom surface has at least a first portion, having a first depth, and a second portion, having at least a second depth greater than the first depth; The second portion has a sequence of cavities for accumulating absorbent material, and protrusions for preventing accumulation of absorbent material, positioned one alternating with the other.
Each cavity has a respective bottom surface defining the second depth of the bottom surface of the seat.
The second portion of the bottom surface of the seat comprises a first cavity located adjacent to the first side and a second cavity adjacent to the second side.
Advantageously, the particular shape of the bottom surface of the seat makes it possible to increase the efficiency of absorbing the liquids of the absorbent core made in it compared with the prior art.
Brief description of drawings
Further features and advantages of the invention are more apparent in the detailed description below, with reference to a preferred, non-limiting embodiment of a device for forming an absorbent core for an absorbent sanitary article as illustrated in the accompanying drawings, in which:
Figure 1 is a schematic front view of a device for forming an absorbent core for an absorbent sanitary article according to the invention;
Figure 2 is a schematic perspective view of a detail of the device of Figure 1 ;
Figure 3 is a schematic view from above of the detail of Figure 2; Figure 4 is a first schematic cross-section of the detail of Figure 3; Figure 5 is a second schematic cross-section of the detail of Figure 3.
Detailed description of preferred embodiments of the invention
With reference to Figure 1 , the numeral 1 denotes a device for forming an absorbent core 100 for an absorbent sanitary article.
The device 1 comprises a forming drum 2, rotatable about its own axis 2a of rotation, having a peripheral surface 3 equipped with at least one seat 4 for forming the absorbent core 100.
A system 22 for feeding absorbent material is positioned facing at least part of the peripheral surface 3 of the drum 2.
The drum 2 has a suction chamber 24 configured to determine the retaining of the absorbent material in the seat 4.
The seat 4 has a main longitudinal axis 4a of extension, parallel to the circumferential direction of extension of the peripheral surface 3 of the drum 2
The seat 4 has a bottom surface 5 and a lateral surface 6 for containing the absorbent material designed to define the absorbent core 100, as shown in Figure 2.
The lateral surface 6 of the seat 4 has a first side 7 and a second side 8, positioned along a direction parallel to the longitudinal axis 6a.
The lateral surface 6 of the seat 4 has a third side 9 and a fourth side 10 positioned along a direction transversal to the longitudinal axis 6a.
The third side 9 of the seat 4 defines a front side of the absorbent core 100, with reference to the user. The fourth side 10 of the seat 4 defines a rear side of the absorbent core 100, with reference to the user.
The shape of the sides of the seat 4, that is, of the first, second, third and fourth sides 7, 8, 9, 10, may have a rectilinear shape, see the first, second and third sides 7, 8 and 9, or a curvilinear shape, see the fourth side 10. The bottom surface 5 has at least a first portion 1 1 , having a first depth, and a second portion 12, having at least a second depth greater than the first depth.
The first depth and the second depth are referred to the peripheral surface 3 of the drum 2.
The first portion 11 extends along at least a first stretch T1 of the length of the bottom surface 5, along a direction parallel to the longitudinal axis 4a of main extension, and along the entire width of the bottom surface 5, along a direction transversal to the longitudinal axis 4a of main extension, as illustrated in Figure 3.
The first portion 11 of the seat 4 comprises one or more inserts 20 which inhibit the action of the suction chamber, not illustrated, and prevent absorbent material from being deposited at each insert 20, thus creating a corresponding zone free of absorbent material inside the absorbent core 100.
Preferably, the first portion 1 1 defines at least a central portion of the absorbent article.
In the embodiment illustrated, the first portion 1 1 defines a central portion and a rear portion of the absorbent article, with reference to the user.
The first portion 1 1 comprises at least part of the first and second sides 7, 8 and the fourth side 10.
The second portion 12 is positioned adjacent to the first portion 1 1 , extending along at least a second stretch T2 of the length of the bottom surface 5 and along the entire width of the bottom surface, along a direction transversal to the longitudinal axis 4a of main extension, as illustrated in Figure 3. The second portion 12 defines a front portion of the absorbent core 100, with reference to the user.
The second portion 12 comprises at least part of the first and second sides 7, 8 and the third side 9.
The first portion 11 and the second portion 12 are both delimited laterally by the first side 7 and by the second side 8.
In other words, the first portion 11 is delimited laterally by the first side 7 and by the second side 8.
The second portion 12 is delimited laterally by the first side 7 and by the second side 8.
Considering the main longitudinal axis 4a of extension of the seat 4, the first portion 1 1 and the second portion 12 are positioned one after the other.
The second portion 12 has a sequence of cavities 13 for accumulating absorbent material, and protrusions 14 for preventing accumulation of absorbent material, positioned in sequence one alternating with the other. Each cavity 13 has a respective bottom surface 15 defining the second depth of the second portion 12 of the bottom surface 5 of the seat 4.
Each protrusion 14 has a respective top surface 14a.
The top surface 14a of a respective protrusion 14 defines a third depth of the seat 4.
The third depth can be included in the interval defined between the first depth of the first portion 1 1 and the second depth of the second portion 12 or can be equal to the first depth of the first portion 1 1.
Each cavity 13 is connected to a respective protrusion 14 defining a continuous curvilinear, or rectilinear, profile, having respective troughs, at the cavities 13, and peaks, at the protrusions 14.
The cavities 13 and the protrusions 14 of the second portion 12 have a main extension along a direction parallel to the longitudinal axis 4a of the seat 4.
In detail, with reference to the lateral surface 6 of the seat 4, the second portion 12 of the bottom surface 5 of the seat 4 comprises a first cavity 16 located adjacent to the first side 7 and a second cavity 17 adjacent to the second side 8 (Ref. Figure 4).
In other words, the first cavity 16 and the second cavity 17 are positioned at respective lateral ends of the seat 4, with reference to a direction transversal to the longitudinal axis 4a of the seat 4.
Advantageously, the union between the first portion 1 1 and the second portion 12 of the seat 4 allows a particular distribution of the absorbent material to be made which reacts more effectively to the absorption of liquids.
In order to make the absorbent core 100, the device 1 comprises a first system 18 for feeding a first web NW1 to the forming drum 2.
The first web NW1 is held by suction on at least part of the peripheral surface 3 of the drum 2, depositing in the seat 4 in contact with the bottom surface 5.
The suction system 9 causes the absorbent material 3 to be distributed on the first web NW1 , positioned on the forming drum 4, inside the seat 6.
The device 1 comprises a second system 19 for feeding a second web NW2.
The second web NW2 is fed to the forming drum 4 downstream of the feed system 22 of the absorbent material.
The first web NW1 , the second web NW2 and the absorbent material 3 interposed between the webs NW1 and NW2 define a composite web NW, that is, a continuous succession of absorbent cores 100.
The device comprises a joining system 21 for joining the composite web NW and a cutting system 23 for cutting the composite web NW into individual pieces, each defining a single absorbent core 100.
The joining system 21 is configured to join the composite web NW at the first and second webs NW1 , NW2 to define the longitudinal edges and the transverse edges of the absorbent core 100.
If the seat 4 has the inserts 20 in the first portion 11 of the bottom surface 5, the joining system 21 is configured to join the composite web NW at the first and the second layer NW1 , NW2 at the zones free of absorbent material defined by the presence of the inserts 20.
The joining system 21 may comprise welding means - for example, ultrasound welding means - or pressing means if an adhesive substance is interposed between the two webs NW1 , NW2 to join them to each other. The first web NW1 is intended to form a first layer 101 of the absorbent core 100.
The second web NW2 is intended to form a second layer 102 of the absorbent core 100.
The thickness of the absorbent core 100 is variable from a minimum thickness, determined by the depth of the first portion 1 1 of the bottom surface 5 of the seat 4, to a maximum thickness, determined by the depth of the second portion 12 of the bottom surface 5 of the seat 4.

Claims

1. A device for forming an absorbent core of an absorbent sanitary article;
the device comprises a forming drum (2), rotatable about its own axis (2a) of rotation, having a peripheral surface (3) equipped with at least one seat (4) for forming the absorbent core (100);
the seat (4) has a main longitudinal axis (4a) of extension, parallel to the circumferential direction of extension of the peripheral surface (3) of the drum (2);
the seat (4) having a bottom surface (5) and a lateral surface (6) for containing the absorbent material defining the shape of the absorbent core (100);
the lateral surface (6) of the seat (4) has a first side (7) and a second side (8), extending parallel to the longitudinal axis (4a) of the seat (4); the bottom surface (5) has at least a first portion (1 1 ), having a first depth, and a second portion (12), having at least a second depth greater than the first depth;
the first portion (1 1 ) and the second portion (12) are both delimited laterally by the first side (7) and by the second side (8);
the second portion (12) has a sequence of cavities (13) for accumulating absorbent material, and protrusions (14) for preventing accumulation of absorbent material, positioned one alternating with the other;
each cavity (13) has a respective bottom surface (15) defining the second depth of the bottom surface (5) of the seat (4);
the second portion (12) of the bottom surface (5) of the seat (4) comprises a first cavity (16) located along the first side (7) and a second cavity (17) located along the second side (8).
2. The device according to claim 1 , characterized in that the cavities (13) and the protrusions (14) extend parallel to each other along a direction parallel to the longitudinal axis (4a) of the seat (4).
3. The device according to claim 1 or 2, characterized in that each cavity (13) is connected to a respective protrusion (14) defining a continuous curvilinear, or rectilinear, profile, having respective troughs, at the cavities (13), and peaks, at the protrusions (14).
4. The device according to any one of the preceding claims, characterized in that the first portion (1 1 ) extends along at least a first stretch (T1 ) of the length of the bottom surface (5), along a direction parallel to the longitudinal axis (4a) of main extension, and along the entire width of the bottom surface (5), along a direction transversal to the longitudinal axis (4a) of main extension.
5. The device according to any one of the preceding claims, characterized in that the second portion (12) is positioned adjacent to the first portion (1 1 ), extending along at least a second stretch (T2) of the length of the bottom surface (5) and along the entire width of the bottom surface, along a direction transversal to the longitudinal axis (4a) of main extension.
6. The device according to any one of the preceding claims, characterized in that each protrusion (14) has a respective top surface (14a) defining a third depth of the seat (4);
the third depth being included in the interval defined between the first depth of the first portion (1 1 ) and the second depth of the second portion (12) or being equal to the first depth of the first portion (1 1 ).
7. The device according to any one of the preceding claims, characterized in that it comprises a first feed system (18) for feeding a first web (NW1 ), intended to form the first layer (101 ) of the pad (100), a second feed system (19) for feeding a second web (NW2) intended to form the second layer (102) of the pad (100), to the forming drum (4), at least the first web (NW1 ), the second web (NW2) and the absorbent material interposed between them define a composite web (NW); the device comprising a joining system (21 ) for joining the composite web (NW) and a cutting system (23) for cutting the composite web (NW) into individual pieces, each defining an absorbent core (100).
8. An absorbent pad made using the device according to any one of claims from 1 to 7, characterized in that the absorbent core (103) is variable from a minimum thickness, determined by the depth of the first portion (1 1 ) of the bottom surface (5) of the seat (4), to a maximum thickness, determined by the depth of the second portion (12) of the bottom surface (5) of the seat (4).
PCT/IB2020/055532 2019-06-17 2020-06-12 Device for forming an absorbent pad for an absorbent sanitary article WO2020254929A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000009123A IT201900009123A1 (en) 2019-06-17 2019-06-17 Device for forming an absorbent pad for a hygienic absorbent article
IT102019000009123 2019-06-17

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000032145A1 (en) * 1998-11-30 2000-06-08 The Procter & Gamble Company Absorbent article having channel
WO2008061178A2 (en) * 2006-11-15 2008-05-22 The Procter & Gamble Company Apparatus for making air-laid structures
WO2014083934A1 (en) * 2012-11-27 2014-06-05 花王株式会社 Absorptive article

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000032145A1 (en) * 1998-11-30 2000-06-08 The Procter & Gamble Company Absorbent article having channel
WO2008061178A2 (en) * 2006-11-15 2008-05-22 The Procter & Gamble Company Apparatus for making air-laid structures
WO2014083934A1 (en) * 2012-11-27 2014-06-05 花王株式会社 Absorptive article

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