EP2018959A2 - Matériau de papier gaufré, procédé et dispositif pour sa fabrication - Google Patents

Matériau de papier gaufré, procédé et dispositif pour sa fabrication Download PDF

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Publication number
EP2018959A2
EP2018959A2 EP08425478A EP08425478A EP2018959A2 EP 2018959 A2 EP2018959 A2 EP 2018959A2 EP 08425478 A EP08425478 A EP 08425478A EP 08425478 A EP08425478 A EP 08425478A EP 2018959 A2 EP2018959 A2 EP 2018959A2
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EP
European Patent Office
Prior art keywords
embossing
ply
protuberances
roller
series
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08425478A
Other languages
German (de)
English (en)
Other versions
EP2018959A3 (fr
Inventor
Mauro Gelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fabio Perini SpA
Original Assignee
Fabio Perini SpA
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 Fabio Perini SpA filed Critical Fabio Perini SpA
Publication of EP2018959A2 publication Critical patent/EP2018959A2/fr
Publication of EP2018959A3 publication Critical patent/EP2018959A3/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/07—Embossing, i.e. producing impressions formed by locally deep-drawing, e.g. using rolls provided with complementary profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0733—Pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0707—Embossing by tools working continuously
    • B31F2201/0715—The tools being rollers
    • B31F2201/0723—Characteristics of the rollers
    • B31F2201/0738—Cross sectional profile of the embossments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0758—Characteristics of the embossed product
    • B31F2201/0761—Multi-layered
    • B31F2201/0764—Multi-layered the layers being nested
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F2201/00—Mechanical deformation of paper or cardboard without removing material
    • B31F2201/07—Embossing
    • B31F2201/0758—Characteristics of the embossed product
    • B31F2201/0761—Multi-layered
    • B31F2201/0766—Multi-layered the layers being superposed tip to tip

Definitions

  • the present invention relates to an embossed web material, in particular a paper material and specifically a multi-ply tissue paper material.
  • the invention also relates to improvements to methods and to devices for processing paper web materials, in particular tissue paper.
  • Embossing is one of the operations that are normally performed on plies or sheets of tissue paper, to produce paper articles for personal and household cleaning and hygiene, or also for commercial and industrial use, such as toilet paper, kitchen towels, paper napkins and handkerchiefs and the like.
  • Embossing is an operation that is performed for the dual purpose of improving aesthetic properties and increasing functional properties, in particular the softness, smoothness, absorption capacity or thickness of the finished material.
  • tissue paper material such as kitchen towel or toilet paper
  • a tissue paper material is produced from two or more plies of paper embossed separately and subsequently joined together by applying glue and laminating the plies between counter-rotating rollers defining a lamination nip.
  • Embossing is typically performed by feeding each ply between an embossing roller, equipped with protuberances, and a pressure roller with an outer surface coated in yielding material, typically rubber.
  • this is known as steel to rubber embossing, as the embossing roller is typically made of steel.
  • embossing is performed between two rollers made of steel or another hard material, one provided with protuberances and the other with corresponding recesses.
  • the protuberances of the embossing roller produce corresponding protuberances or protrusions in the paper ply.
  • the protuberances formed in the two outermost plies are facing the inside of the finished product.
  • the two plies of paper web material are joined by making the protuberances of one ply coincide with protuberances of the other ply, having previously applied glue to the protuberances of one of the two plies, or to at least to some of these protuberances.
  • two embossing rollers that emboss two paper plies separately by means of respective pressure rollers, form therebetween a lamination nip, through which the two embossed plies are fed before being detached from these rollers.
  • the protuberances of one roller coincide with the protuberances of the other roller and the reciprocal distance between the rollers is such as to cause localized compression of the plies at said protuberances.
  • a tip-to-tip embossing unit for obtaining a product of this type is described in US-A-3,414,459 .
  • the tip-to-tip embossing technique has gradually been perfected and improved, in order to solve particular problems arising with this processing method.
  • US-A-5,096,527 describes, for example, a technique to reduce the vibrations and wear in tip-to-tip embossing units.
  • US-A-6,113,723 describes a distribution of protuberances having the object of increasing the adhesion strength through a particular arrangement of the protuberances.
  • US-A-5,736,223 describes a method for producing a paper article in sheet form comprising three layers or plies of tissue paper.
  • US-A-5,173,351 ; US-A-6,032,712 ; US-A-6,245,414 ; US-A-6,053,232 describe embossing-laminating units which with particular measures prevent concentrated wear of the protuberances also when these do not completely coincide, but give rise to a partial correspondence in areas, between some of the protuberances of one roller and some of the protuberances of the other.
  • US-A-3,961,119 describes a tip-to-tip embossing unit, wherein two mutually cooperating embossing rollers are equipped with helical projections. The projections of one embossing roller has protrusions that mesh with recesses provided in the helical projections of the opposed embossing roller.
  • the two plies are embossed separately, each between an embossing roller and a counter-roller or pressure roller.
  • the two plies are then mutually joined so that the protuberances of one ply are nested between the protuberances of the other ply.
  • This is known as "nested" embossing.
  • Lamination of the two plies is obtained between one of the embossing rollers and a laminating roller, while the two embossing rollers are not in contact to one another. Examples of embossing-laminating devices of this type are described in US-A-3,556,907 ; US-A-3,867,225 ; US-A-5,339,730 .
  • Some embossing units can alternatively perform embossing according to the nested technique or according to the tip-to-tip technique.
  • embossing was performed according to very simple geometric patterns, with uniform distribution of frusto-conical or frusto-pyramidal shaped protuberances. This embossing had a prevalently technical function, used to produce a product of adequate thickness and with sufficient softness and absorption capacity.
  • GB-A-2132141 describes an embossing system wherein a multi-ply web material, composed of two plies previously joined by gluing, is fed through an embossing nip defined between two embossing rollers made of steel or the like.
  • the two embossing rollers have protuberances and recesses that mutually mesh to form on the multi-ply web material, which is fed therebetween, protrusions or protuberances that extend from one or other of the two faces of the web material.
  • the product that is obtained is not particularly voluminous and moreover is stiff, due to the presence of large quantities of glue. Machining the embossing rollers or cylinders is complex and the need to angularly adjust them precisely to make the protrusions of one mesh with the recesses of the other substantially limits the type of embossing patterns obtainable with this technique.
  • an object of an embodiment of the invention is to provide a multi-ply paper material made of embossed tissue paper or the like, which presents particular properties of softness and thickness.
  • a multi-ply paper material comprising at least a first paper ply, preferably tissue paper, embossed and joined by gluing to at least a second paper ply, preferably tissue paper, wherein the first ply comprises at least a first series of embossing protuberances protruding from a base surface toward the second ply, and wherein glue is applied to the protuberances of the first series to join said first ply and said second ply.
  • the first ply has a second series of embossing protuberances protruding from the base surface toward the outside of the material on the opposite side with respect to the protuberances of the first series.
  • the second ply is also embossed.
  • the second ply comprises embossing protuberances protruding from a base surface toward the inside of the material and toward said first ply, at least partly nested in recesses defined between embossing protuberances of said first series of embossing protuberances of the first ply.
  • the second ply can be provided with embossing protuberances protruding toward the first ply, inserted in recesses of the first ply forming the inside of the embossing protuberances of said second series of embossing protuberances of the first ply.
  • the second ply comprises embossing protuberances protruding from a base surface toward the inside of the material and having two different heights.
  • the embossing protuberances of the second series of protuberances of the first ply have a rounded outer surface.
  • the embossing protuberances of the second series of protuberances of the first ply are at least partly surrounded by linear protuberances protruding toward the inside of the material, provided with glue and joined to the second ply.
  • the first series of embossing protuberances of the first ply can comprise a plurality of truncated-cone or truncated-pyramid shaped protuberances.
  • the embossing protuberances of the second series of protuberances of said first ply have variable heights.
  • the protuberances of the second series have a linear shape. They can be joined together to form mutually connected continuous lines.
  • the invention provides for a method for the production of a multi-layer embossed paper material, comprising the steps of:
  • An embodiment of the method according to the invention provides for generating on the first ply, by the first embossing roller and the first pressure roller, a second series of embossing protuberances protruding from an opposite side of said base surface with respect to said first series of protuberances.
  • the second series of embossing protuberances is generated by penetration of said elastically yielding coating of the first pressure roller inside recesses extending toward the inside of said surface of the first embossing roller.
  • the embossing protuberances of the second ply can be inserted in recesses of the first ply forming the inside of the embossing protuberances of said second series of protuberances of the first ply.
  • embossing protuberances of at least two different heights, facing said first ply.
  • Some embodiments of the method according to the invention provide for generating on the second ply, by a pressure roller and an embossing roller, a first series of embossing protuberances and a second series of embossing protuberances, protruding from opposite sides of a base surface, said embossing roller presenting protrusions extending toward the outside with respect to a base surface of the embossing roller and recesses extending toward the inside of the embossing roller from said base surface, and said pressure roller presenting a yielding coating cooperating with the protrusions and the recesses of said embossing roller.
  • an embossing unit comprising:
  • Fig.1 schematically shows, in a side view, an embossing unit to which the invention can be applied.
  • the embossing unit indicated as a whole with 1, has a first embossing roller 3 and a second embossing roller 5, rotating about respective substantially parallel axes 3A and 5A.
  • the two embossing rollers 3 and 5 are equipped on the cylindrical surfaces thereof with arrangements of protuberances and recesses as described in greater detail hereunder with reference to Figs.2 to 5 .
  • the first embossing roller 3 cooperates with a first pressure roller 7, equipped with a coating in yielding material 7A on the cylindrical surface thereof cooperating with the cylindrical surface of the embossing roller 3.
  • the embossing roller 5 cooperates with a second pressure roller 9, also equipped with a coating in yielding material indicated with 9A, which coats the surface thereof cooperating with the cylindrical surface of the embossing roller 5.
  • a glue dispenser schematically indicated with 11, of type known per se and not described in greater detail.
  • the embossing unit can also include a laminating or marrying roller 13 cooperating with the embossing roller 3 to mutually laminate two plies embossed separately between the pair of rollers 3, 7 and 5, 9 respectively.
  • the embossing unit 1 has a first path for a first ply V1 that extends around the pressure roller 7, around the first embossing roller 3 and through the nip between the embossing rollers 3 and 5.
  • the embossing unit 1 also has a second path for a second ply V2, path that extends around the second pressure roller 9, around the second embossing roller 5 and through the nip between the rollers 3 and 5.
  • the first embossing roller 3 has a base surface 3S ( Fig.3 ) with substantially cylindrical extension.
  • a first series of protrusions S3 of height H extend from the surface 3S toward the outside of the embossing roller 3.
  • recesses C3 of depth P extend toward the inside of the embossing roller 3 from the base surface 3S thereof.
  • the ply V1 fed through the embossing nip between the rollers 3 and 7 is embossed generating protuberances that protrude from one side and from the other side with respect to a base surface of the ply V1, as will be described in greater detail with reference to Figs. 6A and 6B .
  • the second embossing roller 5 has a substantially cylindrical base surface 5S, from which there protrude a first series of protrusions S5 of height H, in the example shown substantially the same as the height H of the protrusions S3 provided on the first embossing roller 3.
  • protrusions SS5 of height H1 greater than the height H of the protrusions S5 and of the protrusions S3, also extend from the same base surface 5S of the second embossing roller 5.
  • Fig.6A very schematically shows a greatly enlarged cross section of a multi-ply web material N obtained by joining two plies V1 and V2 separately embossed in the embossing nips 3, 7 and 5, 9 respectively of the embossing unit 1 of Fig.1 .
  • the ply V1 has a base surface SV1 from which a first series of protuberances P1, generated by the protrusions S3 of the embossing roller 3, protrude toward the inside of the multi-ply paper web material N.
  • the ply V1 is embossed in two directions: on the outside with the protuberances P2 and on the inside with the protuberances P1.
  • the dispenser 11 applies glue or adhesive CA to mutually join the two plies V1 and V2.
  • the glue can be applied to all the protuberances P2, or only to some of them, for example using a roller with patterns, or cliché roller, to distribute the glue according to a predetermined pattern.
  • the protuberances P1 adhere by means of the glue CA to the base surface SV2 of the second embossed ply V2.
  • This ply V2 has, all protruding from the same side toward the inside of the web material N, protuberances P3 generated by the protrusions S5, nested between the protuberances P1 of the ply V1, and protuberances P4 generated by the protrusions SS5 of the embossing roller 5.
  • the arrangement is such that the protuberances P3 are nested between the protuberances P1 of the ply V1, while the protuberances P4 are located inside the recesses defined within the protuberances P2, facing the outside, formed on the ply V1.
  • the protuberances P4 generated by the protrusions SS5 are of greater height than the protuberances P3 generated by the protrusions S5, the protuberances P4 form a backing for the front portion of the protuberances P2 generated on the ply V1, preventing collapse, i.e. crushing, thereof, notwithstanding the fact that the protuberances P2 are facing the outside of the web material.
  • the height of the protuberances P4 is approximately the same as the height H1 of the protrusions SS5 of the embossing roller 5, said height being approximately the equivalent to the sum of the depth P of the recesses C3 of the embossing roller 3 and of the height H of the protrusions S3 of this embossing roller 3.
  • Fig.6B shows a plan view of a portion of web material N obtained with the rollers of Figs. 2 to 5 .
  • the protuberances P2 generated by the recesses C3 of the embossing roller 3 have in the plan view (and therefore in cross section) an extension substantially greater than that of the remaining protuberances.
  • the protuberances P1 and P3 have a truncated-cone or truncated-pyramid shaped extension, while the recesses C3 and consequently the protuberances P2 generated thereby can have an extension with an approximately square or rectangular section, with more or less curvilinear sides as shown in Fig.6B .
  • the protuberances P2 have rounded edges B, due to the fact that these protrusions are obtained as a result of penetration of the elastically yielding material forming the coating 7A inside the recesses C3.
  • the embossing unit 1 will be equipped in this case with a laminating roller 13 that defines a lamination nip between said roller 13 and the first embossing roller 3.
  • the plies V1 and V2 are fed through said nip, the ply V2 having been detached from the second embossing roller 5 and laid on the first ply V1, which instead is still adhering to and engaged with the protrusions and recesses of the embossing roller 3.
  • the pressure exerted by the laminating roller 13 in the area of the ply V1 corresponding to the protrusions S3 causes lamination and reciprocal gluing of the two plies V1 and V2.
  • Figs.7, 8 and 9 show a further modified embodiment of the invention.
  • Fig.7 shows a plan view of a flat layout of a portion of one of the two embossing rollers 3 and 5 in this modified embodiment.
  • the two rollers can be substantially symmetrical with respect to each other.
  • S3 and S4 indicate protrusions of different heights of the embossing roller 3. These protrusions are visible in greater detail in the schematic cross section of Fig.8 , in which the embossing roller 3 is shown opposed to and cooperating with the embossing roller 5.
  • C3 once again indicates recesses that extend from the base surface 3S of the embossing roller 3 toward the inside of this roller, while the protrusions S4 and S3 from the base surface 3S are facing the outside of the roller.
  • the height of the protrusions S3 is indicated with H, while the height of the protrusions S4 is indicated with h.
  • the embossing roller 5 is engraved substantially with mirror image symmetry to that of the embossing roller 3.
  • C5 indicates recesses protruding toward the inside of the roller 5 starting from a base surface 5S
  • S5 and S6 indicate the protrusions, facing the outside starting from the base surface 5S of the embossing roller 5.
  • the arrangement in this case is of the tip-to-tip type, with the protrusions S3 and S5 arranged in mutual correspondence in the nip between the rollers 3 and 5.
  • the marrying and laminating roller 13 can be omitted or left idle, moving it away from the cylindrical lateral surface of the first embossing roller 3.
  • the plies V1 and V2 are joined by lamination directly between the embossing rollers 3 and 5.
  • the recesses C3 and C5 of the embossing rollers 3 and 5 have a linear shape as shown schematically in Fig.7 for the recesses C3 of the first embossing roller 3.
  • Linear recesses are intended as recesses presenting an extension according to the length thereof substantially greater than the extension according to the width thereof.
  • the ratio between length and width can be at least 5 to 1, and preferably at least 10 to 1 or greater, i.e. the extension in length of the recesses is five times or more the dimension in width.
  • the recesses C3 can extend linearly according to closed lines (square in the example shown) or according to open lines (interrupted composed of a series of consecutive sides). Recesses of this shape are particularly advantageous as therewith protuberances P2 facing the outside of the web material are obtained on the embossed ply which are particularly resistant to crushing, even in the absence of supporting protuberances, such as the protuberances P4 in the embodiment shown in Fig.6A .
  • the two plies V1 and V2 are in tip-to-tip and not in nested arrangement, they are characterized by protuberances P2 on the ply V1 and P4 on the ply V2 approximately mutually corresponding and facing the outside of the web material N formed by joining the plies V1 and V2.
  • the limited width of the protuberances P2, P4 and the considerable extension in length thereof combined with the presence of a high number of mutually corresponding protuberances P1 and P3 bonded together by the glue CA, makes the multi-ply web material N particularly resistant to crushing.
  • the protuberances P1 and P3 are generated by the protrusions S3 and S5 of greater height of the embossing rollers 3 and 5. Therefore, these protuberances are in mutual contact and bonded by the glue CA applied by the glue dispenser 11 to the protuberances P1 when these are still adhering to the embossing roller 3.
  • the protrusions S4 and S6 of lesser height generate, on the two plies V1 and V2, protuberances P6 and P8 of lesser height with respect to the protuberances P1 and P3. Therefore, the protuberances P6 and P8 do not receive glue and are not in reciprocal contact with each other.
  • the protrusions S3, S4 of the first embossing roller 3 and the protrusions S5, S6 of the second embossing roller 5 can be all of the same height, and in this case a multi-ply web material as shown in Fig.10 is obtained, in which the ply V1 has protuberances P2 protruding toward the outside from a base surface SV1 and protuberances P1 protruding toward the inside of the web material N from the base surface SV1.
  • the ply V2 has protuberances P4 facing the outside of the ply V2 starting from a base surface SV2 and protuberances P3 protruding toward the inside of the web material N starting from said base surface SV2.
  • the arrangement is once again tip-to-tip with glue CA applied to the front surfaces of the protuberances P1, at which reciprocal bonding between the plies V1 and V2 takes place.
  • Fig.11 shows a flat layout of a portion of the cylindrical surface of one or other of the two embossing rollers 3 and 5 in a modified embodiment.
  • the pattern of the protrusions and of the recesses is substantially the same as that of Fig.7 .
  • the roller 3 (although the roller 5 can be designed with identical engraving) has recesses C3 of an elongated linear shape, extending toward the inside of the roller starting from a base surface 3S and protrusions S3 facing the outside of the roller 3 starting from the base surface 3S, all of the same height H, but with different plan dimensions for the three types of protrusions which can, for example, be produced pyramid-shaped with a square or rectangular base.
  • Fig.13 shows an engraving similar to that of Figs. 7 or 11 , where C3 indicates the recesses with linear extension and S3 and S4 indicate the protrusions radially facing the outside from a base surface 3S.
  • the recesses C3 with linear extension are arranged so that they never cut through the protrusions S3, S4, i.e. the recesses C3 extend according to lines parallel to the alignments of the protrusions S3 and S4 and without interfering therewith.
  • the two rollers 3 and 5 can be produced to be mutually matched with mirror image symmetry as indicated schematically in Fig.8 .
  • Fig.14 instead shows a modified embodiment, in which one or other or both the embossing rollers 3 have individual protrusions S3, i.e. composed, for example, of truncated-pyramid or truncated-cone shaped protuberances, or in general having a limited extension and mutually separated.
  • These protrusions S3 are combined with linear protrusions S8 facing the outside starting from a base surface indicated with 3S ( Fig.15 ).
  • the embossing roller 5 can be designed to have mirror image symmetry. In this case, the recesses C3 again present a linear shape similar to that shown in Fig.13 .
  • the recesses C3 have the particularity of being side by side with, and totally or partly surrounded by, the linear protrusions S8.
  • These protrusions S8 generate in the ply V1, embossed by the roller 3 and/or in the ply V2 embossed by the roller 5, protuberances preferably substantially of the same height as the protuberances generated by the protrusions S3.
  • the glue dispenser 11 applies glue to the front surfaces of all these protuberances. By mutually joining these two plies, high resistance to crushing of the protuberances formed by the recesses C3 of the roller 3 or by the new recesses C5 of the roller 5 is thus obtained. This is due to the fact that these protuberances protruding toward the outside of the web material N are surrounded along the bases thereof by lines of glue corresponding to the linear extension of the protrusions S8.
  • Fig.15A very schematically shows in a greatly enlarged cross section a portion of web material N obtained by two embossing rollers 3, 5 engraved with substantially mirror image symmetry of the type shown in Fig.15 .
  • the same numbers indicate the same or equivalent parts to those of Fig.9 .
  • P1 and P3 indicate the protuberances generated by the protrusions S3 and S8 of the embossing roller 3 and by the corresponding protrusions of the embossing roller 5 matching the roller 3 with mirror image symmetry.
  • the second ply V2 could also be unembossed, or embossed with micro-embossing.
  • the micro-embossing or other base embossing can be characterized by protrusions all of the same height and all protruding toward the inside of the web material.
  • Fig.15B schematically shows a greatly enlarged cross section of a portion of web material obtained with a first ply V1 embossed with an embossing roller 3 configured as in Fig.15 , joined to a smooth ply V2.
  • the same numbers indicate the same or equivalent parts to those in Figure 15A . It must be understood that web materials with an embossed ply V1 and a smooth ply V2 can also be obtained using engraved embossing rollers as shown in the preceding figures.
  • Figs.16 and 17 show the flat layout of portions of two embossing roller 3 and 5 engraved with a different embossing pattern.
  • the same numbers indicate the same or equivalent parts to those of the previous embodiments.
  • C3 indicates the linear recesses protruding radially toward the inside starting from the base surface 3S of the roller 3.
  • S8 indicates the linear protrusions surrounding the linear recesses C3, while S3 indicates truncated-cone or truncated-pyramid shaped and individual, i.e. mutually isolated, protrusions of small dimensions.
  • Fig.17 shows the engraving of the embossing roller 5, with 5S indicating the base surface from which truncated-cone or truncated-pyramid shaped protrusions S5 and linear shaped protrusions S6 protrude toward the outside.
  • the arrangement is such that the plies embossed separately by the two rollers 3 and 5 with the respective pressure rollers 7 and 9 are mutually joined in nested arrangement as shown schematically in the section of Fig.18 .
  • P1 indicates a first series of protuberances facing the inside of the web material N formed of the protrusions S3 of the roller 3 on the ply V1
  • P2 indicates the protrusions or linear bulges protruding toward the outside of the ply V1, formed by means of the linear recesses C3.
  • the protuberances or bulges P2 are surrounded by linear protrusions P1' facing the inside of the web material N, to which glue C is applied, formed by the protrusions S8 of the roller 3.
  • the protuberances P1' have the same height as the protuberances P1, also provided with glue C.
  • the ply V2 has protuberances P4 (formed by the protrusions S5) inserted in the protuberances P2 of the ply V1 and protuberances P3 of lesser height (formed by the protrusions S6), which are inserted between protuberances P1, P1' of the ply V1.
  • the recesses C3 of the roller 3 can have different widths from one another, as shown in Fig.16 and also different depths. In one embodiment the recesses C3 of greater width are also of greater depth. For example, in one embodiment the recesses C3 can have widths of 3 mm, 2.5 mm, 2 mm respectively with depths of 1 mm, 0.75 mm and 0.5 mm with respect to the plane of the base surface 3S.
  • the roller 5 can have protuberances of variable heights, to obtain a final product of nested type, with protrusions of the ply V2 of variable heights that are inserted in the protuberances of protrusions in the form of bulges protruding from the ply V1, also of variable heights.
  • the finished product thus obtained is shown in a schematic cross section in Fig.18A . It has on the outside of the ply V1 protuberances or bulges with linear extension P21, P22, P23, of different heights and widths obtained by embossing in the linear recesses of the roller 3.
  • the cross section of the roller 3 is shown in Fig.18B .
  • C31, C32, C33 indicate the linear recesses that generate the protuberances or linear bulges P21, P22, P23, while H1, H2 and H3 indicate the heights of the protuberances P21, P22 and P23 respectively.
  • the recesses C31, C32, C33 have variable depths in a manner corresponding to the variation of the heights H1, H2, H3.
  • protuberances P41 P42, P43 also of different heights, produced by protrusions of the roller 5, indicated with S51, S52 and S53 in the section of Fig.18C , which shows a portion of the roller 5.
  • the roller 5 has protrusions S6, of lesser height, preferably with linear extension, which generate protuberances P3, facing the inside of the web material N and which nest between the protuberances P1 of the ply V1.
  • the protuberances or bulges P21, P22, P23 with linear extension are surrounded by continuous lines of glue that make these bulges more resistant to compression.
  • This embossing pattern with variable embossing depths allows a product to be obtained which, at least on the outer part thereof (considering the product as wound in a roll, with the ply V1 facing the outside), has an irregular surface, i.e. not flattened to the same height, but formed of depressed craters in the central part of each rhomboidal figure, which is delimited by a peripheral frame formed by the linear protuberances protruding from the web material, obtained along continuous channels C3 of the embossing roller ( Fig.16 ).
  • the paper product obtained presents raised and depressed areas and, at the same time, the base paper material presents a different degree of absorbency, as the fibers thereof are deformed and stressed in a different manner from area to area, i.e. to a greater extent on the peripheral frame of each rhomboidal figure and to a lesser extent in the central part thereof.
  • the product thus obtained has superior properties of performance than conventional products, due both to the different form and to the different absorbency capacity.
  • the upper part of the composite product i.e. on the side of the ply V1
  • the areas of the product with greater absorbency are the first to be involved - as they protrude to a greater extent - and therefore as soon as they come into contact with the liquid substance they allow rapid diffusion thereof toward the innermost areas of the product, conveying the liquid substance toward the center of each rhomboidal figure.
  • the composite product owing to the form thereof, generates pockets or spaces inside the contact lines formed by the linear protrusions corresponding to the linear recesses C3, which facilitate elimination of the material to be removed.
  • the recesses hollowed out of the embossing roller (such as the recesses C3) are partly or fully surrounded by protuberances or protrusions (such as those indicated with S8, Fig.15 ), so that on the embossed web material the protrusions in the form of bulges of the tissue paper or other base material forming the plies, generated at the recesses C3 are made more stable and less susceptible to collapse, due to the presence of continuous or almost continuous lines along the base of these protrusions or bulges.
  • protuberances or protrusions such as those indicated with S8, Fig.15
  • the recesses C5 provided on the embossing roller 5 can have different widths and depths.
  • the channel, i.e. linear recesses C3 and/or the linear recesses C5 can all have the same width and the same depth, or different widths and the same depths, or the same widths and different depths.
  • Fig.19 shows a modified embodiment with respect to that shown in Fig.16 and represents a flat layout of a portion of engraved surface of the embossing roller 3.
  • protrusions S10 with linear extension that form a generic motif have been produced in some areas of the roller.
  • the lowered portions of the roller 3, between the linearly extending protrusions S10, have variable depth.
  • the upper ply V1 obtained by embossing by the roller 3 of Fig.19 in this manner has protuberances or bulges P21, P22, P23 of different heights facing the outside of this ply, obtained in the depressed areas between the linear protrusions S10 of the roller 3.
  • protuberances or bulges P21, P22, P23 protuberances are nested, facing the inside of the web material generated on the ply V2, also of different heights, obtained by the protrusions of the roller 5.
  • the protrusions S10 of the roller 3 have a discontinuous curvilinear linear shape.
  • the ply V1 has protuberances or bulges P21, P22, P23 of variable heights facing the outside, obtaining an effect in terms of performances of the product similar to that described with reference to the product of Fig.18A .
  • the recesses intended to form, by embossing on the respective ply, the protuberances facing the outside of the web material are first produced by chemical etching.
  • the protrusions S3, S4, S5, S6, S8 are engraved, again using an acid etching process or by mechanical machining by means of chip removal.
  • the base surface 3S or 5S of the embossing roller 3, 5 is therefore represented by the bottom of the second engraving.
  • the recesses C3, C5 are engraved with a depth with respect to the initial cylindrical surface equivalent to the sum of the depth P of the recesses with respect to the base surfaces 3S or 5S and the height of the protrusions extending from said base surface toward the outside of the roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
EP08425478.8A 2007-07-18 2008-07-08 Matériau de papier gaufré, procédé et dispositif pour sa fabrication Withdrawn EP2018959A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITFI20070163 ITFI20070163A1 (it) 2007-07-18 2007-07-18 "materiale cartaceo goffrato, metodo e dispositivo per la sua produzione"

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EP2018959A2 true EP2018959A2 (fr) 2009-01-28
EP2018959A3 EP2018959A3 (fr) 2014-07-30

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CN105082626A (zh) * 2014-05-09 2015-11-25 金红叶纸业集团有限公司 层状薄型材料、制造该层状薄型材料的制造设备及制造方法
WO2015186052A1 (fr) * 2014-06-05 2015-12-10 Kimberly-Clark Worldwide, Inc. Procédé et appareil de gaufrage de couches de tissu
EP2955016A1 (fr) * 2014-06-09 2015-12-16 Gambini International S.A. Feuille multicouche améliorée
WO2016030784A1 (fr) * 2014-08-29 2016-03-03 Delicarta S.P.A. Produit en cellulose multicouche gaufré et son moyen de fabrication
WO2019005036A1 (fr) * 2017-06-28 2019-01-03 Kimberly-Clark Worldwide, Inc. Rouleaux de tissu ouaté ayant des propriétés variables dans le sens travers
EP3795744A1 (fr) * 2019-09-23 2021-03-24 Matthews International GmbH Procédé de fabrication d'un papier absorbant texturé ainsi que dispositif correspondant
IT202000014047A1 (it) * 2020-06-12 2021-12-12 Ind Cartarie Tronchetti Spa Sistema di goffratura e prodotto ottenuto con tale sistema
IT202200003380A1 (it) 2022-02-23 2023-08-23 Engraving Solutions S R L Rullo goffratore, metodo di incisione e goffratore comprendente il rullo goffratore
EP4269085A1 (fr) 2022-04-27 2023-11-01 Sofidel S.p.A. Dispositif de gaufrage-stratification avec rouleaux gravés à double hauteur

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ITFI20020053A1 (it) * 2002-03-29 2003-09-29 Perini Fabio Spa Metodo e dispositivo per la produzione di un materiale nastriforme goffrato e manufatto ottenuto con detto metodo
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US3556907A (en) 1969-01-23 1971-01-19 Paper Converting Machine Co Machine for producing laminated embossed webs
US3867225A (en) 1969-01-23 1975-02-18 Paper Converting Machine Co Method for producing laminated embossed webs
US3961119A (en) 1973-03-15 1976-06-01 Kimberly-Clark Corporation Embossed paper toweling and method of production
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US5339730A (en) 1991-06-28 1994-08-23 Kaysersberg Method for printing-embossing paper sheets
US5736223A (en) 1993-07-09 1998-04-07 James River Multilayer embossed papers, and device and method for producing same
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EP1520930A1 (fr) * 2003-10-02 2005-04-06 Georgia-Pacific France Feuille de papier absorbant à relief amélioré

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105082626A (zh) * 2014-05-09 2015-11-25 金红叶纸业集团有限公司 层状薄型材料、制造该层状薄型材料的制造设备及制造方法
CN105082626B (zh) * 2014-05-09 2018-12-18 金红叶纸业集团有限公司 层状薄型材料、制造该层状薄型材料的制造设备及制造方法
WO2015186052A1 (fr) * 2014-06-05 2015-12-10 Kimberly-Clark Worldwide, Inc. Procédé et appareil de gaufrage de couches de tissu
EP2955016A1 (fr) * 2014-06-09 2015-12-16 Gambini International S.A. Feuille multicouche améliorée
WO2016030784A1 (fr) * 2014-08-29 2016-03-03 Delicarta S.P.A. Produit en cellulose multicouche gaufré et son moyen de fabrication
US10654239B2 (en) 2014-08-29 2020-05-19 Sofidel S.P.A. Embossed multilayered cellulose product and means for the production thereof
WO2019005036A1 (fr) * 2017-06-28 2019-01-03 Kimberly-Clark Worldwide, Inc. Rouleaux de tissu ouaté ayant des propriétés variables dans le sens travers
US11085150B2 (en) 2017-06-28 2021-08-10 Kimberly-Clark Worldwide, Inc. Tissue rolls having variable cross-machine direction properties
EP3795744A1 (fr) * 2019-09-23 2021-03-24 Matthews International GmbH Procédé de fabrication d'un papier absorbant texturé ainsi que dispositif correspondant
IT202000014047A1 (it) * 2020-06-12 2021-12-12 Ind Cartarie Tronchetti Spa Sistema di goffratura e prodotto ottenuto con tale sistema
IT202200003380A1 (it) 2022-02-23 2023-08-23 Engraving Solutions S R L Rullo goffratore, metodo di incisione e goffratore comprendente il rullo goffratore
EP4269085A1 (fr) 2022-04-27 2023-11-01 Sofidel S.p.A. Dispositif de gaufrage-stratification avec rouleaux gravés à double hauteur

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