EP1772257A2 - Dispositif de gaufrage et laminage et produit multi-couche gaufré - Google Patents

Dispositif de gaufrage et laminage et produit multi-couche gaufré Download PDF

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Publication number
EP1772257A2
EP1772257A2 EP06425692A EP06425692A EP1772257A2 EP 1772257 A2 EP1772257 A2 EP 1772257A2 EP 06425692 A EP06425692 A EP 06425692A EP 06425692 A EP06425692 A EP 06425692A EP 1772257 A2 EP1772257 A2 EP 1772257A2
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EP
European Patent Office
Prior art keywords
protuberances
embossing
ply
areas
roller
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Withdrawn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
EP06425692A
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German (de)
English (en)
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EP1772257A3 (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
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Filing date
Publication date
Application filed by Fabio Perini SpA filed Critical Fabio Perini SpA
Publication of EP1772257A2 publication Critical patent/EP1772257A2/fr
Publication of EP1772257A3 publication Critical patent/EP1772257A3/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Withdrawn legal-status Critical Current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
    • 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
    • B31F2201/0771—Other aspects of the embossing operations
    • B31F2201/0776—Exchanging embossing tools
    • 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
    • B31F2201/0784—Auxiliary operations
    • B31F2201/0787—Applying adhesive

Definitions

  • the present invention relates to improvements to so-called embossing and laminating devices, i.e., devices that perform embossing of two or more plies of paper and join them by means of glue application and lamination.
  • the invention also relates to improvements to embossed weblike materials, especially with a tissue-paper base, of the multiply type, i.e., comprising at least two plies joined to one another, typically and preferably by gluing.
  • Embossing is one of the operations that are typically carried out on plies or sheets of tissue paper for the production of paper articles for cleaning and personal hygiene, or also for commercial or industrial use, such as, for example, toilet paper, paper wipes, paper napkins and handkerchiefs, and the like.
  • Embossing is an operation that is carried out for the dual purpose of improving the characteristics of aesthetic appearance and of increasing the functional characteristics, such as, in particular, softness, smoothness, absorbing capacity, or the thickness of the finished material.
  • tissue paper such as paper wipes and toilet paper
  • a material made of tissue paper is made up of two or more plies of paper that are embossed separately and then joined to one another via application of glue and lamination of the plies between counter-rotating rollers, which define between them a lamination nip.
  • Embossing is typically carried out by making each ply to pass between an embossing roller, equipped with protuberances, and a pressure roller with an outer surface coated with compliant material, typically rubber.
  • the process is in this case referred to as "steel-rubber embossing" given that the embossing roller is typically made of steel.
  • embossing is carried out between two rollers made of steel or other hard material, one provided with protuberances and the other with corresponding recesses.
  • the protuberances of the embossing roller generate corresponding protuberances or projections in the paper ply.
  • the protuberances formed in the two outermost plies are oriented towards the inside of the finished product.
  • the two plies of the weblike paper material are joined together by bringing the protuberances of one ply to correspond with the protuberances of the other ply, after prior application of a glue on the protuberances of one of the two plies, or on at least part thereof.
  • two embossing rollers that emboss two plies of paper separately by means of respective pressure rollers form between them a lamination nip, passing through which are the two embossed plies, before they are detached from the rollers themselves.
  • the protuberances of one roller coincide with the protuberances of the other, and the distance between the rollers is such as to cause a localized compression of the plies in positions corresponding to said protuberances.
  • a tip-to-tip embosser for obtaining a product of this type is described in US-A-3,414,459 .
  • the tip-to-tip embossing technique has undergone progressive improvements in order to solve particular problems that arise with this processing method. Described, for example, in US-A-5,096,527 is a technique for reducing the vibrations and wear in tip-to-tip embossing units.
  • US-A-6,113,723 describes a distribution of protuberances having the purpose of increasing the gluing resistance via a particular arrangement of the protuberances.
  • US-A-5,736,223 describes a method for the production of a paper product made in sheets comprising three plies of tissue paper.
  • US-A-5,173,351 , US-A-6,032,712 , US-A-6,245,414 , and US-A-6,053,232 describe embossing-laminating units that, by adopting particular measures, prevent a concentrated wear of the protuberances even when these do not coincide completely, but rather give rise to a correspondence over areas, between some of the protuberances of one roller with some of the protuberances of the other.
  • US-A-3,961,119 describes a tip-to-tip embossing unit, in which two embossing rollers co-operating with one another are equipped with helical projections. The projections of one embossing roller present protrusions that mesh with cavities made in the helical projections of the opposed embossing roller.
  • the two plies are embossed separately, each between one embossing roller and a counter-roller or pressure roller.
  • the two plies are then glued to one another in such a way that the protuberances of one ply nest between the protuberances of the other.
  • This type of embossing is referred to as "nested" embossing.
  • the lamination of the two plies is obtained between one of the embossing rollers and a laminating roller, whilst the two embossing rollers do not come into contact with one another. Examples of embossing-laminating devices of this type are described in US-A-3,556,907 , US-A-3,867,225 , and US-A-5,339,730 .
  • US-A-5,686,168 describes a method of nested embossing, in which the plies are joined by lamination between two opposed embossing rollers.
  • US-A-6,261,666 describes a similar device for carrying out alternatively a tip-to-tip embossing or a nested embossing. Another similar device is described in US-A-6,109,326 .
  • embossing was obtained according to very simple geometrical patterns, with uniform distributions of frusto-conical or frusto-pyramidal protuberances. Said embossings mainly had a technical function, having the purpose of providing a product of adequate thickness and with a sufficient softness, as well as absorption capacity.
  • embossing is increasingly required to fulfill a dual purpose, namely both a technico-functional one and an aesthetic one.
  • embossing patterns and embossing devices that will enable a product to be obtained that is pleasant from the aesthetic point of view and at the same time suitable for meeting the increasingly high aesthetic and commercial requirements demanded of these products.
  • Embossing is no longer obtained only by means of elementary geometrical patterns, but envisages the combination of embossings that are more or less dense (sometimes micro-embossings) and embossed and possibly printed decorative patterns. Examples of complex embossings are described in US-A-6,136,413 ; US-A-5,846,636 ; and US-A-6,106,928 .
  • a further problem that is encountered working with the tip-to-tip technique is represented by the lack of flexibility in the choice of the decorations in so far as, up to now, one embossing roller has always been opposed by just one other roller; i.e., the decorations are made so that one roller can work coupled just to one other very precise roller, which is not interchangeable. It is thus not possible to replace the pattern on one side of the multiply weblike material, without also changing the pattern on the other face.
  • an object of the present invention is to provide an embossing and lamination device that will enable a more convenient adjustment and smaller difficulties of phasing between the embossing rollers.
  • an object of the present invention is to provide a tip-to-tip embossed multiply paper product that is easier to produce, with smaller difficulties in phasing of the machinery for its production.
  • An object of an improved embodiment of the invention is to provide a device that will enable production of an embossed multiply product alternatively according to the tip-to-tip technique or according to the nested technique.
  • a further object of the present invention is to provide rollers which, also in tip-to-tip operations, will enable interchangeability of one roller with the other; i.e., they will enable tip-to-tip operation between a first roller and a second interchangeable roller.
  • the invention relates to an embossing and laminating unit for the production of an embossed weblike material comprising at least two plies embossed separately and then coupled to one another, said unit comprising a first embossing roller with first embossing protuberances and a second embossing roller with second embossing protuberances, said embossing rollers defining a nip between them, passing through which are said at least two embossed plies, it being possible for said embossing rollers to be phased with respect to one another in such a way that, in said nip, at least some of the first protuberances correspond to at least some of the second protuberances in a tip-to-tip configuration.
  • first protuberances are elongated in a first longitudinal direction
  • second protuberances are elongated in a second longitudinal direction
  • said longitudinal directions being oriented in such a way that in the nip between said two rollers, the longitudinal directions of the first protuberances and of the second protuberances intersect.
  • an embossed weblike material with at least two plies, in which the protuberances on the two plies arrange themselves in a tip-to-tip configuration, i.e., with the protuberances of one ply corresponding to the protuberances of the opposite ply, without the need for a precise phasing of the embossing rollers.
  • There is in fact a tolerance in the axial and angular phasing of the embossing rollers that is all the greater, the greater the principal dimension (i.e., along the longitudinal extension) of the various protuberances.
  • Protuberances elongated in non-parallel directions remain in tip-to-tip configuration even though they do not cross one another perfectly in the middle line when the two embossing rollers are not perfectly in phase.
  • the protuberances are made in such a way that they can be brought also into the nested configuration, preferably with an angular staggering instead of an axial staggering of the two rollers. This renders the design and construction of the supports of the rollers simpler.
  • the invention relates to a material made of a multiply embossed paper sheet, comprising at least a first ply and at least a second ply, joined to one another by gluing, in which said first ply and said second ply have first protuberances and second protuberances, oriented towards the inside of the weblike material, at least some of the first protuberances of the first ply corresponding to some of the second protuberances of the second ply, said material being characterized in that at least some of said first and second protuberances are elongated in longitudinal directions that intersect one another so that protuberances that correspond to one another are in mutual contact and glued in an intermediate area of their longitudinal development.
  • the invention relates to an embossing and laminating unit for the production of an embossed weblike material comprising at least two plies embossed separately and coupled to one another, comprising a first embossing roller with first embossing protuberances and a second embossing roller with second embossing protuberances, said embossing rollers defining a nip between them, passing through which are said at least two embossed plies, said unit being characterized in that at least some of said first protuberances have a linear development and surround areas in which, in the said nip, protuberances of the second roller insert,.
  • a further aspect of the invention regards a multiply embossed-paper sheet material, comprising at least a first ply and at least a second ply, joined to one another by gluing, in which said first ply and said second ply have first protuberances and second protuberances oriented towards the inside of the weblike material, said material being characterized in that said first protuberances have a linear development and surround areas of the first ply forming swellings projecting towards the outside of the sheet material.
  • Figure 1 shows a diagram of an embossing-laminating unit, designated as a whole by 2, comprising a first embossing roller 1 and a second embossing roller 3, rotating about respective axes of rotation 1A and 3A.
  • f1 and f3 indicagte the directions of rotation.
  • a nip G passing through which are two plies of tissue paper V1 and V3, separately embossed by the rollers 1 and 3, respectively.
  • Embossing is obtained by causing each of the plies to pass between the respective embossing roller 1 or 3 and a corresponding pressure roller 5 or 7, where 5A and 7A designate the axes of rotation.
  • rollers 5 and 7 are coated with a layer of yielding material, for example rubber or the like, in which protuberances with which the embossing rollers 1 and 3 are equipped penetrate, said protuberances being hereinafter designated as a whole by 1 P and 3P in Figure 1. Possible configurations of these protuberances will be described in detail in what follows.
  • the two rollers 1 and 3 can be phased so as to bring the protuberances 1 P and 3P into a tip-to-tip configuration or else into a nested configuration.
  • the first condition in the lamination nip G at least some of the protuberances of the roller 1 correspond to protuberances of the roller 3, and the distance between the rollers 1 and 3 is such that a pressure is exerted between the protuberances sufficient to cause lamination and gluing together of the plies V1 and V3.
  • the protuberances 1P are interspersed between the protuberances 3P.
  • Nn and Npp are the two alternative paths of the weblike material N formed by the two plies V1 and V3, said paths being different according to whether the material is processed with the tip-to-tip technique (path Npp) or else with the nested technique (path Nn).
  • a glue-dispensing unit which applies a glue on the radially most projecting surfaces of the ply V1 embossed by the roller 1, when said ply is still engaged to the surface of said roller 1.
  • Adjustment of the rollers 1 and 3 in order to operate in the tip-to-tip condition or in the nested condition can be obtained in a way known per se, via adjustment of the angular phase between the two rollers 1 and 3, or else via mutual displacement in the axial direction, or else with the two movements combined with respect to one another.
  • the mechanical members and, in particular, the supports for the rollers 1 and 3 that enable this adjustment are in themselves known and will not be described in detail herein.
  • Figures 2 and 3 show a development in the plane of a portion of the cylindrical surface of the two embossing rollers 1 and 3 in a first possible embodiment. Since the protuberances made on these rollers correspond, as regards shape and distribution, to the protuberances that are formed on the plies V1 and V3, Figures 2 and 3 are basically plan views of portions of the plies V1 and V3.
  • protuberances for reasons of simplicity, as regards the protuberances only the boundaries of the respective front surfaces are shown, it being understood that said protuberances normally have the shape of a truncated cone, i.e., they thin out in the centrifugal radial direction, as is shown in the sections of Figures 2A and 3A.
  • the protuberances comprise a first series of alignments of protuberances 101P distributed according to helices about the axis of the roller 1.
  • the protuberances 101 P are elongated in the direction of the respective alignments 101A formed by them.
  • the alignments 101A of protuberances 101P are arranged in pairs and intersect one another to form rectangular areas within which protuberances 103P of smaller dimensions are arranged.
  • the protuberances 103P have, in particular, a smaller cross section than the protuberances 101 P and also a smaller height.
  • Figure 2A shows a local schematic and enlarged cross-sectional view according to the arrow IIA-IIA of Figure 2.
  • the height H of the protuberances 101 P is greater than the height h of the protuberances 103P.
  • protuberances 105P having an irregular shape and height h, equal to the height of the protuberances 103P, are located.
  • Figure 3 shows a development in the plane of the surface of the embossing roller 3 with the respective protuberances, which correspond as regards shape and distribution to the protuberances that said roller forms on the ply V3.
  • the protuberances on the roller 3 are distributed with a first series of alignments 301A of elongated protuberances 301 P having substantially the same shape (in this example) as the protuberances 101P of the roller 1.
  • the protuberances 301 P are oriented with their major dimension orthogonal to the direction of the alignments 301A of which they form part.
  • FIG. 3A is a schematic and very enlarged cross-sectional view according to the line IIIA-IIIA of Figure 3, in which said difference of dimensions may be noted. It is to be understood that the various figures are indicative and not in scale.
  • the reference number 305P designates protuberances of an irregular shape which are arranged in the areas of intersection between the alignments 301A and which also have a height H. Consequently, all the protuberances 301 P, 303P and 305P of the roller 3 have the same height H, i.e., they are as high as the protuberances 101 P of the roller 1.
  • the alignments 101A and 301A are designed so as to form meshes of equal dimensions.
  • the median lines of the alignments 101A and 301A, designated by L1 and L3 define on the two rollers 1 and 3 equal lattices.
  • protuberances 101 P are arranged according to a lattice defined by the helical lines L1 that is the same as the lattice according to which the protuberances 301 P are arranged, in the lamination nip G mutual contact will be obtained and pressure exerted between protuberances 101P and 301 P.
  • these protuberances that come into mutual contact are oriented at 90° with respect to one another so that contact and gluing between the two plies V1 and V3 occurs only in the restricted area of intersection between said protuberances, designated I in Figure 4.
  • the protuberances 103P, 105P, 303P, 305P have the function of preventing the two plies V1 and V3 from collapsing in the areas where there is no mutual contact between the protuberances 101P and 103P.
  • An error in phasing of the rollers can entail staggering between these protuberances, which, on the other hand, does not cause any drawback in terms of mutual gluing of the plies.
  • the ply V1 that receives the glue over the entire front surface of the protuberances 101 P is glued, hence, on a surface that is much greater than the one that will in effect be used for gluing to the ply V3. It follows that, in the finished product, the ply V3 will be softer to the touch and the ply V1 will be stiffer and more absorbent on account of the greater amount of glue. In addition, if a colored glue is used, the ply V1 will be also colored on the entire protuberances 101 P, whilst the ply V3 will be practically colorless or colored only on account of leakage of glue in positions corresponding to the areas of intersection I between protuberances 101 P and 301 P.
  • the arrangement and shape of the protuberances 101 P, 103P, 105P, 301 P, 303P, 305P on the two rollers 1 and 3 is such that, with an appropriate phasing of said rollers, it is possible to bring the protuberances into a nested position, i.e., to bring the protuberances of one of the rollers in positions corresponding to the empty spaces between the protuberances of the other.
  • said phasing can be obtained with axial displacement or else angular displacement of the rollers.
  • Figure 5 shows the superposition (obtained by radial sliding of one roller with respect to the other) in the nested configuration of the protuberances of the two rollers and hence of the two plies V1 and V3 embossed thereby.
  • Figure 5A shows a highly enlarged local cross section according to the line VA-VA of Figure 5 of the weblike product obtained by coupling the embossed plies V1 and V3.
  • Figures 6, 6A, 7 and 7A show a modified configuration of the protuberances of the embossing rollers 1 and 3. Reference numbers that are the same designate parts that are the same as or equivalent to those of the previous figures.
  • Figure 6 shows a development in the plane of a portion of the embossing roller 1, i.e., a portion of the ply V1 embossed by said roller.
  • Designated by 101P are the elongated protuberances arranged according to the alignments 101A along the lines L1; designated by 103P are the protuberances of smaller dimensions arranged in the square areas defined by the alignments 101A; finally, designated by 105P are the protuberances of irregular shape arranged in the areas of intersection between the alignments 101A of protuberances 101P.
  • Figure 6A shows the detailed enlargement of Figure 6.
  • Figure 7 is the development in the plane of a portion of the corresponding roller 3, i.e., the roller designed to co-operate with the roller 1 configured as in Figure 6.
  • the distribution of protuberances corresponds to the distribution of protuberances on the ply V3 embossed by the roller 3.
  • Figure 7A shows an enlarged detail of Figure 7.
  • Figures 8 and 9 show developments in the plane of a portion of the cylindrical surface of the embossing roller 1 with a configuration of the protuberances modified with respect to the one illustrated in Figure 6.
  • the rollers configured as illustrated in Figures 8 and 9 co-operate with a roller 3 configured as in Figure 7.
  • some of the protuberances 103P arranged in the square areas generated by the intersection of alignments 101A have a circular front surface, whilst others have a lobed front surface.
  • elongated protuberances 101 P arranged in the areas of intersection of the elongated protuberances 101 P are lobed protuberances with two different shapes.
  • the elongated protuberances 101 P are of two different dimensions, with different lengths in the direction of the principal axis.
  • Figures 10, 10A, 10B, and 11 show a further embodiment of the protuberances on the embossing rollers 1 and 3.
  • Figure 10 shows a portion developed in the plane of the cylindrical surface of one or the other of the rollers 1, 3, which in this case are identical to one another.
  • Figure 10A shows a cross section according to the line XA-XA of Figure 10.
  • the rollers are surface etched with grooves 402, which define protuberances 401 P with elongated development.
  • the grooves 402 are arranged in sets of six to form square areas of sides A x B.
  • the grooves 402 are oriented with their major dimension according to one or the other of the two directions designated by X and Y in Figure 10.
  • the directions X and Y can correspond to the machine direction and to the cross direction (i.e., respectively, the circumferential direction and the axial direction of the rollers), or else can be inclined, for example and preferably at 45°, with respect to the machine direction and hence with respect to the axis of the respective rollers.
  • each of the two rollers are "tiles", each of which is formed by a protuberance with quadrangular development along the sides A, B and a series of internal protuberances orthogonal and parallel to said sides.
  • the quadrangular protuberance defines a closed surface of dimensions A x B.
  • the protuberance with quadrangular development could be eliminated, in which case the quadrangular surface A x B would not be delimited by a protuberance but would be defined by bringing up to one another the side-by-side arranged protuberances 401 P formed by grooves 402.
  • the weblike material N that is obtained has a configuration represented schematically in the perspective view in Figure 11.
  • the two plies V1 and V3 have protuberances, once again designated by 401 P, oriented towards the inside of the ply, arranged in sets, and defining a sort of slats or strips arranged to form square areas corresponding to the tiles A, B with orientation of the protuberances 401 P in the two directions X and Y so that in each square area defined by respective and opposed tiles A, B of the two rollers 1, and 3, the protuberances 401 P of one ply are arranged at 90° with respect to the protuberances of the opposed ply 401 P.
  • Each protuberance 401 P of one of the two plies intersects, then, each of the protuberances 401 P of the corresponding square are in the other of the two plies.
  • each square area has seven protuberances or projections, each of these will be in contact in seven points with the corresponding protuberances 401 P of the opposed ply.
  • a high density of gluing points, very close to one another, is thus obtained, which prevent collapsing, i.e., squeezing, of the plies when the weblike material N is wound into a roll.
  • the protuberances 401 P facing the inside of the weblike material define, on the two surfaces of the weblike material itself, projections having the shape corresponding to the shape of the grooves 402 of the embossing rollers, said projections on the plies V1 and V2 being again designated 402.
  • Figure 10B shows a cross section similar to that of Figure 10A, but in an improved embodiment.
  • the edges at the base and at the distal end of each protuberance 401 P are rounded off and are designated 401A and 401 B, respectively.
  • Rounding off these edges a similar rounded off configuration of the protuberances is obtained on the embossed weblike material.
  • Rounding-off of the base edges 401A means that the projections 402 on the ply V1 or V3 of the weblike material will be without any sharp edges facing the outside of the weblike material so that this has a smoother appearance without any asperities and hence more pleasant to the touch.
  • rounded-off edges 401 B does not contribute significantly to the tactile characteristics of the embossed product, but increases appreciably the mechanical strength thereof.
  • This rounded-off conformation of the base and end edges of the protuberances of the embossing rollers can be adopted also in all the other embodiments described, to achieve the same or similar advantages.
  • the glue is applied on the protuberances 401 P of just one of the two plies V1 and V3.
  • the glue is applied on the protuberances 401 P of just one of the two plies V1 and V3.
  • the opposed ply will receive glue only in the approximately square areas of mutual contact between the protuberances 401 P of the two plies V1, V3 in the points of intersection.
  • Figure 12 shows a development in the plane of a portion of the cylindrical surface of the rollers 1, 3 in an embodiment slightly modified with respect to the one illustrated in Figures 10 and 10A.
  • Designated by MD and CD are, respectively, the machine direction and the cross direction, i.e., the direction of feed of the weblike material (hence the circumferential direction of the rollers 1, 3) and the direction according to which the axes of the embossing rollers 1, 3 are oriented, respectively.
  • the protuberances 401 P have a curved profile.
  • the sides of the protuberances have a concave pattern: consequently, each protuberance 401 P no longer has the shape of an approximately rectangular strip, but rather has a front surface of variable width, namely, minimum at the center of the protuberance and maximum at the end.
  • the protuberances moreover have a rounded-off cross section so that, on the embossed plies, protuberances will be generated without any sharp edges.
  • the base and end edges 401A, 401 B of the protuberances 401 P of the embossing rollers can be rounded off for the purposes described above.
  • Figure 13 shows in a development in the plane a portion of the weblike material N formed by the two plies V1 and V3 superimposed on one another and glued.
  • the discrete areas Z1 represent the points of intersection between the protuberances 401 P of the two plies V1 and V3. These areas are hence those at which gluing of the plies to one another occurs.
  • Designated by Z2 are, instead, areas in which there is a presence of glue applied on the ply V1, but without contact with the ply V3. In these areas, then, there is no mutual gluing of the plies, but a decoration of the glued ply is obtained, in particular when the glue is colored.
  • the axial and/or angular phasing of the two rollers 1 and 3 is much simpler as compared to a normal embossing-laminating unit of the tip-to-tip type.
  • protuberances 401 P of the two rollers within each tile A, B defines (as clearly visible in Figure 13) a plurality of points of gluing in tip-to-tip configuration.
  • Figure 14 shows a modified embodiment of the pattern illustrated in Figure 12.
  • Figure 14A shows a highly enlarged detail of Figure 14.
  • Reference numbers that are the same designate parts that are the same as or equivalent to those of Figure 12.
  • the two rollers 1 and 3 will not be identical to one another, but will differ as regards the configuration of the protuberances 406 and hence the decorative patterns 404 formed by these, once again in order to prevent the need for a precise alignment, i.e., a precise phasing, between the two rollers 1 and 3.
  • the etching pattern on the roller 1 is the one represented in Figures 14 and 14A, for example, the roller 3 will present an etching of the type shown in Figures 15 and 15A, where the latter shows an enlarged detail of the former.
  • the decorations are designated by 404X, and the corresponding protuberances that form them by 406X.
  • the use of protuberances 406 and 406X of different shapes for the two rollers and with a development elongated in directions different from one another enables a tip-to-tip correspondence to be obtained also between these protuberances, without the need for a precise phasing between the rollers 1 and 3.
  • a pair of rollers made with etchings as represented in Figures 14, 14A and 15, 15A, as likewise a pair of rollers made with a pattern of the type illustrated in Figure 12 or in Figure 10 can work only in tip-to-tip configuration on account of the linear development of the protuberances 401 P.
  • Figure 16 shows a modified embodiment of the roller 3, and Figure 16A shows an enlargement of a detail of Figure 16.
  • the protuberances designed as in Figures 16, 16A can be made on the roller 3 and can co-operate with the protuberances of the roller 1 made as in Figures 14, 14A.
  • the pair of rollers thus configured can work in tip-to-tip mode or alternatively in nested mode.
  • 16A made on the roller 3 are square areas of size A x B containing alignments L4 and L6 of protuberances of an oval shape, instead of a rectilinear shape.
  • the protuberances 401 P of the opposed roller 1 can, in this way, be interspersed between protuberances 405P of the roller 3.
  • Designated by 404Y are, moreover, decorations formed by distributions of protuberances 406Y, which will come to correspond to the decorations 404 formed by the protuberances 406 illustrated in Figures 14 and 14A.
  • the protuberances 405P can have, as illustrated in Figure 16A, variable dimensions between the central area and the end of each alignment in order to follow the transverse dimension of the cavities 402 between the linear protuberances 401 P of the roller 1.
  • rollers with etchings arranged according to relatively simple patterns have been illustrated.
  • the principle underlying the invention can be implemented also in more complex forms to obtain products with even very elaborate patterns.
  • An example of embodiment of this type is illustrated in Figure 17, 18, and 19.
  • Figures 17 and 18 illustrate developments in plane of portions of the cylindrical surfaces of the two embossing rollers 1 and 3, respectively.
  • the roller 1 ( Figure 17) has a distribution of protuberances similar to that of Figures 2, 6, 8, and 9.
  • combinations of intermediate protuberances are arranged, designated once again by 103P, which define wordings and patterns (in the example illustrated a Christmas pattern).
  • intersecting alignments of protuberances may once again be noted, oriented in a way different with respect to the protuberances of the roller 1.
  • Figure 19 shows an enlarged detail of a development in the plane of the two plies V1, V3 embossed with the rollers 1, 3. It may be noted in Figure 19 how almost all the protuberances of one ply will come to correspond to almost all the protuberances of the other ply.
  • the orientation of the protuberances and their elongated shape means that the correspondence between protuberances of one ply and protuberances of the other will be obtained without any precise phasing between the two rollers, as has already been described in the examples of the previous figures.
  • Figures 20 to 22 show a further embodiment of the invention.
  • Figure 20 shows a portion developed in the plane of the cylindrical surface of a first embossing roller, designated by 1. It has a series of protuberances 501 having linear development. Characteristically, in this case, the protuberances 501 are configured and arranged so as to enclose partially depressed surface portions 502.
  • 501X are two symmetrical linear protuberances, which delimit an intermediate surface 502X.
  • Designated by 501Y is a pair of linear protuberances of different shape, which delimit between them a depressed intermediate surface 502Y.
  • Figure 20A shows a schematic and highly enlarged cross-sectional view of two symmetrical protuberances 501 P. In this example of embodiment they have rounded-off base edges 501A and rounded-off end edges 501 B, for the reasons already described with reference to the previous examples of embodiment.
  • the ply V1 or V3 embossed with an embossing roller having protuberances of the above type will present protuberances facing the inside of the weblike material having a shape corresponding to the protuberances 501 P and projecting outwards, corresponding to the depressed areas or cavities 502, as will be described with reference to the schematic cross-sectional view of Figure 22A.
  • the roller 3, which co-operates with the roller 1, has a distribution of protuberances 505P of approximately elliptical cross section and of variable sizes and shapes.
  • the shape, size and distribution of the protuberances 505P on the roller 3 are such that, in the nip between the two rollers 1, 3, the protuberances 505P insert within the empty spaces between the protuberances 501 P, with a nested-type configuration.
  • Figure 22 shows a superposition of the patterns of the protuberances of the two rollers 1 and 3, which can be viewed also as the projection in plan view of the embossing patterns obtained on the two plies V1 and V3 embossed by two rollers.
  • Figure 22A shows a highly enlarged and schematic local cross section of a portion of plies V1 and V3 embossed and coupled to one another, in positions corresponding to the line of section B-B of Figure 22. It may be noted that the ply V1 has protuberances 501 P facing inwards and glued on the internal end so as to adhere to the non-embossed surfaces of the ply V3.
  • the latter has protuberances 505P corresponding to the protuberances 505P of the roller 3 ( Figure 21).
  • the height of the protuberances 505P may be the same as or (as in the example illustrated) smaller than the height H of the protuberances 501 P.
  • the ply V1 has, between thin and elongated inwardly-oriented protuberances 501 P, swellings or projections facing outwards, designated by 502, corresponding to the grooves or depressed areas 502P of the embossing roller 1.
  • These projections or swellings 502 have external rounded-off edges 502B and internal rounded-off edges 502A, corresponding to the rounded-off edges 501 B and 501A ( Figure 20A) of the protuberances 501 P on the roller 1.
  • the protuberances 505P can have a height equal to or smaller than that of the protuberances 501 P.
  • a weblike material is hence obtained, having a large volume and with a feel, i.e., a tactile effect, that is particularly pleasant thanks to the wide convex protuberances or projections 502 with rounded-off edges 502B, which remain puffy and voluminous even after the weblike material has been, for example, packaged in the form of rolls or folded serviettes, on account of the support provided by the projections 505P.
  • the projecting portions 502 form a sort of closed or almost closed cells that bestow a considerable volume on the final material. These cells are defined by projections, i.e., swellings, of the plyed material towards the outside of the composite sheet material.
  • the protuberances 501 P can have a width of between 0.3 and 3 mm, and preferably between 0.5 and 2.5 mm or more preferably 0.5 and 2 mm, and a height of between 0.2 and 3 mm, and preferably between 0.5 and 1.5 mm.
  • the linear development of the protuberances 501 P can be, for example, between 5 mm and 50 mm, and preferably between 10 mm and 25 mm.
  • each protuberance 501 P can have, for example, a linear development of between 2 and 30 mm, and preferably between 5 and 25 mm.
  • the protuberances When the protuberances have an interrupted linear development, they still define a perimeter delimiting an area of the weblike material or of the embossed ply.
  • the area of said perimeter corresponding to the interruptions of the protuberances can be of the order of 25% or less of the overall development of the perimeter.
  • the protuberances delimit a total perimeter of 40 mm, they can present interruptions for a total length of 20 mm or less.
  • the area enclosed by each closed linear protuberance or by each group of linear protuberances set alongside one another in such a way as to define a substantially closed area can have a perimeter advantageously of between 10 and 100 mm.
  • the cells or projections 502 that are formed on the weblike material can have dimensions of between 3 and 30 mm, and preferably between 5 and 20 mm.
  • the ply V1 will come to be on the outside, usually being the one presenting the more decorated face.
  • the glue applied on the distal, i.e., front, surfaces of the protuberances of weblike material formed on the protuberances 501 P can be colored to obtain an effect of decorative print in addition to embossing.
  • the protuberances 501 P are of a shape such as to define between them delimited areas 502 that are not completely enclosed in so far as the aforesaid protuberances are interrupted. It is not, however, excluded to make said protuberances 501 P of a continuous and closed shape, for example with a linear development of a circular, polygonal, elliptical or even mixtilinear type, as is, for example, illustrated schematically in Figure 23, in which three different continuous and closed protuberances 501 P are shown, which delimit internal depressed areas 502. In one case, two concentric protuberances are provided.
  • the embossed weblike material can advantageously be constituted by a variable number of plies of tissue paper, for example even up to five plies, with weight per unit area advantageously of between 12 and 30 g/m 2 for each ply and between 25 and 110 g/m 2 for the finished multiply material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Paper (AREA)
  • Laminated Bodies (AREA)
EP06425692A 2005-10-10 2006-10-09 Dispositif de gaufrage et laminage et produit multi-couche gaufré Withdrawn EP1772257A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITFI20050212 ITFI20050212A1 (it) 2005-10-10 2005-10-10 Dispositivo goffratore-laminatore e prodotto goffrato multistrato

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EP1772257A2 true EP1772257A2 (fr) 2007-04-11
EP1772257A3 EP1772257A3 (fr) 2009-09-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010066284A1 (fr) * 2008-12-09 2010-06-17 Sca Hygiene Products Ab Produit fibreux avec un gaufrage tramé et procédé de fabrication
WO2010066285A1 (fr) * 2008-12-09 2010-06-17 Sca Hygiene Products Ab Rouleau gaufreur pour fabriquer des produits fibreux avec un gaufrage tramé, dispositif employant un tel rouleau gaufreur et agencement de saillies de gaufrage sur ce rouleau gaufreur
WO2010139759A1 (fr) * 2009-06-04 2010-12-09 Georgia-Pacific France Papier absorbant gaufre a motif mixte
WO2015104029A1 (fr) * 2014-01-09 2015-07-16 Unimatec Prägesysteme Gmbh Outil de gaufrage pour coller et gaufrer ponctuellement plusieurs couches de substrats en forme de bande et procédé de fabrication d'un rouleau de gaufrage destiné à un tel outil
EP2048283B1 (fr) 2007-08-30 2015-08-19 INDUSTRIE CARTARIE TRONCHETTI SpA Appareil pour le collage de deux ou plusieurs plis pour la fabrication de produits en tissu

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738905A (en) * 1970-04-29 1973-06-12 Kimberly Clark Co Paper toweling material and method of combining into multi ply products
US3953638A (en) * 1973-11-26 1976-04-27 The Procter & Gamble Company Multi-ply absorbent wiping product having relatively inextensible center ply bonded to highly extensible outer plies
US4284465A (en) * 1978-10-10 1981-08-18 American Can Company Apparatus for the manufacture of fibrous sheet structure
FR2743824B1 (fr) * 1996-01-22 1998-02-27 James River Feuille stratifiee a gaufrage mixte
US6261666B1 (en) * 1998-08-14 2001-07-17 Paper Converting Machine Co. Two-ply paper products with either nested or foot-to-foot embossments and method of making
MX2009000829A (es) * 2006-07-26 2009-03-09 Sca Hygiene Prod Gmbh Producto de papel tissue de multiples capas, dispositivo de conversion de papel para un producto de papel tissue de multiples capas y metodo para producir un producto de papel tissue de multiples capas.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2048283B1 (fr) 2007-08-30 2015-08-19 INDUSTRIE CARTARIE TRONCHETTI SpA Appareil pour le collage de deux ou plusieurs plis pour la fabrication de produits en tissu
WO2010066284A1 (fr) * 2008-12-09 2010-06-17 Sca Hygiene Products Ab Produit fibreux avec un gaufrage tramé et procédé de fabrication
WO2010066285A1 (fr) * 2008-12-09 2010-06-17 Sca Hygiene Products Ab Rouleau gaufreur pour fabriquer des produits fibreux avec un gaufrage tramé, dispositif employant un tel rouleau gaufreur et agencement de saillies de gaufrage sur ce rouleau gaufreur
RU2484969C2 (ru) * 2008-12-09 2013-06-20 Ска Хайджин Продактс Аб Волокнистое изделие с растровым тиснением и способ изготовления такого изделия
RU2484968C2 (ru) * 2008-12-09 2013-06-20 Ска Хайджин Продактс Аб Тиснильный валик для изготовления волокнистых изделий с растровым тиснением, устройство, использующее подобный тиснильный валик, и выполнение тиснильных выступов на подобном тиснильном валике
US8920905B2 (en) 2008-12-09 2014-12-30 Sca Hygiene Products Ab Fibrous product with a rastered embossing and method for producing same
RU2540772C2 (ru) * 2009-06-01 2015-02-10 Джорджия-Пасифик Франс Гофрированная впитывающая бумага со смешанной структурой
WO2010139759A1 (fr) * 2009-06-04 2010-12-09 Georgia-Pacific France Papier absorbant gaufre a motif mixte
FR2946279A1 (fr) * 2009-06-04 2010-12-10 Georgia Pacific France Papier absorbant gaufre a motif mixte
US9205623B2 (en) 2009-06-04 2015-12-08 Sca Tissue France Embossed absorbent paper with mixed patterns
WO2015104029A1 (fr) * 2014-01-09 2015-07-16 Unimatec Prägesysteme Gmbh Outil de gaufrage pour coller et gaufrer ponctuellement plusieurs couches de substrats en forme de bande et procédé de fabrication d'un rouleau de gaufrage destiné à un tel outil

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