WO2022214949A1 - Plant and method for producing folded or interfolded laminar products made of paper material - Google Patents

Plant and method for producing folded or interfolded laminar products made of paper material Download PDF

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Publication number
WO2022214949A1
WO2022214949A1 PCT/IB2022/053142 IB2022053142W WO2022214949A1 WO 2022214949 A1 WO2022214949 A1 WO 2022214949A1 IB 2022053142 W IB2022053142 W IB 2022053142W WO 2022214949 A1 WO2022214949 A1 WO 2022214949A1
Authority
WO
WIPO (PCT)
Prior art keywords
pressing
stack
interfolded
folded
laminar products
Prior art date
Application number
PCT/IB2022/053142
Other languages
French (fr)
Inventor
Daniele Dettori
Original Assignee
Körber Tissue Fold S.R.L.
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 Körber Tissue Fold S.R.L. filed Critical Körber Tissue Fold S.R.L.
Publication of WO2022214949A1 publication Critical patent/WO2022214949A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/30—Arrangements for removing completed piles
    • B65H31/3027—Arrangements for removing completed piles by the nip between moving belts or rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
    • B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/422—Handling piles, sets or stacks of articles
    • B65H2301/4223—Pressing piles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/514—Modifying physical properties
    • B65H2301/5143—Warming
    • B65H2301/51432—Applying heat and pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/26—Particular arrangement of belt, or belts
    • B65H2404/261—Arrangement of belts, or belt(s) / roller(s) facing each other for forming a transport nip
    • B65H2404/2614—Means for engaging or disengaging belts into or out of contact with opposite belts, rollers or balls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/26—Particular arrangement of belt, or belts
    • B65H2404/269—Particular arrangement of belt, or belts other arrangements
    • B65H2404/2693—Arrangement of belts on movable frame
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/18—Form of handled article or web
    • B65H2701/182—Piled package
    • B65H2701/18271—Piled package of folded sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/19—Specific article or web
    • B65H2701/1924—Napkins or tissues, e.g. dressings, toweling, serviettes, kitchen paper and compresses

Definitions

  • the present invention relates to the field of paper and in particular the plants and the processes for producing laminar products made of paper material, such as packages of napkins, paper tissues, and similar products. Description of the prior art
  • a transfer step of the packages follows for the subjecting the same to following treating and packaging steps.
  • Example of paper converting machines of this type are for example described in EP1457444, EP1415945 and EP1640305.
  • the package exiting the head of the interfolding machine depending on the type of interfolded product and, therefore, its final use, can be directed to a cutting machine for dividing it into packages of desired length.
  • a packaging step of the stack of laminar products can be, furthermore, provided in order to position them into containers, such as boxes made of paper material, that are directly delivered to the users.
  • containers such as boxes made of paper material
  • the product can be sold in packages or banded stacks, as happens in the case of the "hand towels", which are introduced into distributors of predetermined size.
  • the stacks of folded or interfolded laminar products are pressed at a pressing station.
  • two pressing elements are positioned at opposite sides with respect to the stack of laminar products to be pressed in order to reduce its height from a starting height to a final height.
  • a pressing station at which the aforementioned pressing step is carried out is, for example, described in WO2019/158197.
  • the pressed package tends to go back, at least partly, to the starting height due to the elastic return of the paper material thus making at least partly fruitless the aforementioned operation.
  • a pressing station of packages of laminar products is described in SE430491.
  • a pressing device is provided upstream of which a wetting device is arranged to wet the stack of laminar products. Downstream of the pressing device is, instead, provided a drying tunnel.
  • an object of the present invention to provide a pressing unit for plants for producing packages of laminar products made of paper material, such as packages of folded or interfolded napkins, tissue papers, towels and similar products, that is able to avoid, or anyway to limit, the elastic return of the package to the starting height once that the pressing operation ends.
  • a plant for producing folded or interfolded laminar products made of paper material comprising a pressing station equipped with: a displacement device configured to move along a predetermined advancement direction at least one stack of folded or interfolded laminar products made of paper material; a pressing device configured to move between a rest configuration and a pressing configuration where is arranged to apply a determined pressing action on said stack of laminar products made of paper material folded or interfolded at least at one pressing portion; whose main characteristic is that said pressing device is equipped with a heating device configured to transfer a predetermined thermal power (Pt) to the aforementioned stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least limit, any elastic return of the stack of folded or interfolded laminar products, once that the aforementioned pressing action is removed.
  • Pt predetermined thermal power
  • the pressing device can comprise a first pressing member and a second pressing member which are able to move one with respect to the other between a distant configuration, corresponding to said rest configuration, in which it is possible to position between them said stack of folded or interfolded laminar products made of paper material, and a close configuration, corresponding to said pressing configuration, in which are arranged to apply said pressing action on the stack of laminar products.
  • the aforementioned pressing device can be provided with the aforementioned displacement device. More in particular, the displacement device can provide a first and a second displacement member associated, respectively, to the first and to the second pressing member.
  • the, or each, heating device can be an induction heating device.
  • each induction heating device can comprise: an alternating current generator configured to generate an alternating current; at least one induction member configured to be crossed by said alternating current to generate a magnetic field, said magnetic field being arranged to generate eddy currents in a heat transmission member configured to transfer said thermal power (Pt) to said stack of folded or interfolded laminar products.
  • an alternating current generator configured to generate an alternating current
  • at least one induction member configured to be crossed by said alternating current to generate a magnetic field, said magnetic field being arranged to generate eddy currents in a heat transmission member configured to transfer said thermal power (Pt) to said stack of folded or interfolded laminar products.
  • an adjustment device can be, furthermore, provided configured to adjust the alternating current generated by the device for generating the alternating current, in such a way to be able to adjust the thermal power Pt transferred to the stack of laminar products made of paper material.
  • the heating device can comprise at least one containment chamber arranged to contain, in use, a predetermined heat transfer fluid at a predetermined temperature and pressure. More in particular, the aforementioned said heat transfer fluid, for example hot air, steam, diathermic oil, etc. is arranged to transfer the predetermined thermal power (Pt) to the, or each, heat transmission member.
  • a predetermined heat transfer fluid for example hot air, steam, diathermic oil, etc. is arranged to transfer the predetermined thermal power (Pt) to the, or each, heat transmission member.
  • a method for producing stacks of folded or interfolded laminar products made of paper material comprising the steps of: moving the stack of folded or interfolded laminar products made of paper material, along a predetermined advancement direction; pressing the stack of laminar products at a pressing device in such a way to reduce the height of the stack of laminar products from a first height HI to a second height H2, with H2 ⁇ H1; whose main characteristic is that it is, furthermore, provided a step of transferring a predetermined thermal power (Pt) to the stack of folded or interfolded laminar products made of paper material, by a heating device of which the aforementioned pressing device is provided of, in such a way to avoid, or at least to limit any elastic return of the stack of folded or interfolded laminar products made of paper material can occur at the end of said pressing step.
  • Pt predetermined thermal power
  • the aforementioned step of transferring the predetermined thermal power (Pt) to the stack of laminar products can be carried out during said pressing step.
  • the aforementioned step of transferring the predetermined thermal power (Pt) to the stack of laminar products can be partly carried out at the aforementioned pressing device and partly at a heating station positioned upstream, or downstream, of the pressing station.
  • a plant for producing folded or interfolded laminar products made of paper material comprises a pressing station equipped with: a displacement device configured to feed at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction; a pressing device configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack of folded or interfolded laminar products made of paper material at least at one pressing portion; at least a heating device configured to transfer a predetermined thermal power (Pt) to said stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least to limit any elastic return of said stack of folded or interfolded laminar products made of paper material can occur once that said pressing action is removed; wherein said, or each, heating device is an induction heating device.
  • Pt predetermined thermal power
  • a plant for producing folded or interfolded laminar products made of paper material comprises a pressing station equipped with: a displacement device configured to feed at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction; a pressing device configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack of folded or interfolded laminar products made of paper material at least at one pressing portion; at least a heating device configured to transfer a predetermined thermal power (Pt) to said stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least minimize, any elastic return of said stack of folded or interfolded laminar products, made of paper material once that said pression action is removed; and wherein said displacement device comprises a first and a second displacement member positioned at opposite sides of said stack of folded or interfold
  • FIG. 1 diagrammatically shows a side elevation view of a first embodiment of a pressing station, according to the invention, of a plant for producing stacks of laminar products made of paper material according to the invention in a rest configuration;
  • FIG. 2 diagrammatically shows a side elevation view of the pressing station of figure 1 in a pressing configuration
  • FIG. 3 and 4 diagrammatically show a side elevation view of an alternative embodiment of the pressing station of figures 1 and 2, respectively in a rest configuration and in a pressing configuration;
  • FIG. 5 diagrammatically shows a side elevation view, of another alternative embodiment of the pressing station of figure 1 in a pressing configuration
  • FIG. 6 diagrammatically shows a side elevation view of a further alternative embodiment of the pressing station of figure 1 in a pressing configuration
  • FIG. 7 shows in detail an enlargement of the portion of the pressing station shown in figure 6 to highlight some features of the same;
  • FIG. 8 diagrammatically shows a side elevation view, of still another alternative embodiment of the pressing station of figure 1 in a pressing configuration
  • - Figures 9 and 10 diagrammatically show a side elevation view of still further embodiments of the pressing station of figure 1 in a pressing configuration according to the invention.
  • a plant for producing a laminar products in particular made of a paper material, in particular paper, or cardboard, but also different materials, for example nonwoven fabric, folded or interfolded, for example packages of napkins, paper tissues, towels or similar products, comprises a pressing station 10 equipped with a displacement device 40 configured to feed at least one stack 50 of folded or interfolded laminar products made of paper material, at a time, along a predetermined advancement direction 150.
  • the aforementioned laminar products made of paper material can be folded or interfolded, at a folding or interfolding unit not shown in the figure for simplicity, but anyway of known type, for example of the type described in EP1457444, or EP1630118, or W02020161571 in the name of the same Applicant .
  • the pressing station 10 can be equipped with a pressing device 30 configured to move from a rest configuration, in which it is possible to position at least one stack of laminar products 50 at the same (figure 1) and a pressing configuration in which is arranged to apply a pressing action on the stack 50 of laminar products to reduce its height from a first height HI to a second height H2, with H2 ⁇ H1 (figure 2).
  • a pressing device 30 configured to move from a rest configuration, in which it is possible to position at least one stack of laminar products 50 at the same (figure 1) and a pressing configuration in which is arranged to apply a pressing action on the stack 50 of laminar products to reduce its height from a first height HI to a second height H2, with H2 ⁇ H1 (figure 2).
  • the pressing device 30 can provide a first and a second pressing member 30a and 30b which are able to move with respect to each other between a distant configuration corresponding to the aforementioned rest configuration, in which the first and second pressing members 30a and 30b are positioned at a starting distance dl greater than the height HI of the stack 50 of laminar products whereby it is possible to position the same between the pressing members 30a and 30b (figure 1), and a close configuration in which the first and second pressing members 30a and 30b are arranged to apply the aforementioned pressing action on the stack 50 of folded or interfolded laminar products made of paper material to reduce the height from a first height HI to a second height finale H2, with H1 ⁇ H2 (figure 2).
  • an actuation device 80 can be provided, for example a motor, advantageously an electric motor, configured to cause the aforementioned movement of the pressing device 30 between the rest configuration and the pressing configuration. More in particular, the aforementioned actuation device 80 can be operatively connected to at least one between the first and the second pressing member 30a, or 30b by a connection portion 85, for example an actuation shaft. Furthermore, the pressing station 10 can provide a support frame 60.
  • the actuation device 80 can be an actuator, in particular a hydraulic actuator.
  • connection portion 85 can comprise devices for converting the rotational motion of the shaft of the electric motor into a linear motion, such as recirculating balls, lead screws, or other similar devices.
  • a heating device 70 is, furthermore, provided configured to transfer a predetermined thermal power (Pt) to the stack 50 of folded or interfolded laminar products, in such a way to heat the same and avoid, or anyway, limit any elastic return of the stack 50 that could occur at the end of the pressing step, i.e. once that the pressing action is removed, which would cause to bring the height back to a value greater than the aforementioned value H2 obtained at the end of the pressing step.
  • Pt predetermined thermal power
  • the aforementioned pressing device 30 can be provided with the aforementioned heating device 70.
  • the transfer of thermal power (Pt) to the stack 50 of folded or interfolded laminar products is carried out immediately before, immediately after, or during the pressing action, thus resulting particularly effective.
  • the heating device 70 can provide at least one heat transmission member associated to at least one pressing member between the first and the second pressing member 30a and 30b, for example to the first pressing member 30a. More in particular, the heat transmission member can be arranged to apply, or transfer, the aforementioned thermal power Pt to the stack 50 of folded or interfolded laminar products.
  • the heat transmission member can be at least one of the pressing portions 31a, or 31b.
  • the pressing portion 31a, or 31b can be made of a metallic material.
  • the aforementioned displacement device can provide a first and a second displacement member 41a and 41b, for example a first and a second transmission belt 41a and 41b, associated respectively to the first and the second pressing member 30a and 30b. Therefore, in this case, the aforementioned displacement device is integrated in the pressing device.
  • the first and the second displacement member 41a and 41b are positioned at opposite sides of the worked stack 50 and are advantageously configured to cause the stack 50 of folded or interfolded laminar products made of paper material to be positioned at the aforementioned heating device 70.
  • the heating device 70 for example the, or each, pressing portion 31a and/or 31b, can be arranged to transfer the aforementioned thermal power Pt to the stack 50 of folded or interfolded laminar products, through the or each displacement member 41a, and/or 41b, for example the, or each, transmission tape, or the, or each, transmission belt.
  • the, or each, displacement member 41a, and/or 41b can be made of, or covered by, a material that is able to be resistant to high temperatures.
  • the aforementioned material can be Polytetrafluoroethylene, or Teflon, or PTFE, able to be resistant up to about 260 °C.
  • each pressing member 30a, or 30b can comprise a pressing plate 31a, or 31b arranged at the side opposite to the displacement member 41a, or 41b, with respect to the stack of worked laminar products 50.
  • the heating device 70 can comprise at least one induction heating device associated to at least one between the first and the second pressing member 30a, or 30b.
  • the heating device 70 can comprise a first induction heating device 70a associated to the first pressing member 30a and provided with at least one induction member 72, and one second induction heating device 70b associated to the second pressing member 30b and in its turn provided with at least one induction member 72.
  • each induction member 72 can be configured to be crossed by the alternating current generated by an alternating current generator, not shown in the figure for simplicity reasons.
  • the, or each, induction member 72 is arranged to generate a magnetic field which generates eddy currents in the respective heat transmission member, for example in the respective pressing portion 31a, or 31b.
  • the induction heating device 70 allows to cause an accurate, localized and easy to be check, increasing of the temperature at the heat transmission member, in particular the pressing member 31a, or 31b, without any physical contact with the induction member.
  • an adjustment device 200 configured to adjust the alternating current generated by the device for generating the alternating current, in such a way to adjust the thermal power Pt transferred to the stack 50 of laminar products made of paper material.
  • the, or each, heating device 70, or 70a and 70b provides a containment chamber 76, for example defined in a reservoir, or in a duct 75 and arranged to contain, in use, a determined quantity of a heating fluid, arranged to transfer the determined thermal power Pt to the heat transmission member, in particular to the, or each, pressing portion 31a, or 31b.
  • the heating fluid can be hot air, or steam, or diathermic oil.
  • the heating device 70 can provide, in particular, a boiler that is not diagrammatically shown for simplicity reasons.
  • At least one displacement member 41a, or 41b, and the respective pressing member 31a, or 31b can be, respectively, provided with at least one hole 42 and 32 through which the aforementioned heating device 70 can be arranged to transfer the aforementioned thermal power Pt to the stack 50 of worked laminar products.
  • the aforementioned holes 42 and 32 are arranged to a be aligned in a determined relative position between the displacement member 41a, or 41b and the respective pressing member 31a, or 31b.
  • the or each displacement member 41a, or 41b, and the respective pressing member 31a, or 31b are respectively provided with a plurality of holes 42 and 32.
  • the device for transferring the aforementioned thermal power Pt provides at least one containment chamber 76
  • this can be opened on a side facing towards the displacement member 41a, or 41b associated to the same.
  • the feeding of the heat transfer fluid into the, or each, containment chamber 76 can be carried out only at predetermined intervals of time, or when a detection member, not shown in the figure for simplicity reasons, for example a sensor of presence, signals the presence of the stack 50 of laminar products in a predetermined position with respect to the heating device 70, for example at the pressing station 10.
  • the displacement device 40 for example the first and second transmission belts 41a, 41b of the pressing station 10, can operate continuously, that means without stopping the stack 50 of laminar products made of paper material, or in discontinuously.
  • the displacement device 40 can be configured to position the or each stack 50 of laminar products at a predetermined position within the pressing station and to stop the same in order to give the heating device 70 the possibility of transferring the aforementioned thermal power Pt to the stack 50, and then starting again in such a way to discharge the pressed stack 50 downstream of the pressing station 10 in order to subject the same to following operations, if foreseen.
  • At least one transmission belt 41a, or 41b can be provided with at least one hole 42 (see figure 7) through which the heating device 70 can be arranged to apply the aforementioned thermal power Pt to the worked stack 50 of laminar products, case not shown in the figure for simplicity reasons.
  • the aforementioned containment chamber 76 is, advantageously, provided with at least one inlet through which the heat transfer fluid can be fed into the same through at least one inlet duct 77 and at least an outlet through which the heat transfer fluid can be discharged through at least one exit duct 78 once that the aforementioned thermal power Pt stack 50 has been transferred to the worked laminar products.
  • At least one between the first and the second pressing member 30a and 30b can be inclined at a predetermined angle with respect to the horizontal direction, for example an angle comprised between 2° and 30° in such a way to form a "funnel" and to avoid that the feeding motion of the stack 50 of laminar products through the pressing station 10, can cause a not homogeneous pressing of the same along a longitudinal direction.
  • the first and second pressing members 30a and 30b are inclined in such a way to be closer one to the other at the side where the pressed stack 50 exits the pressing device 30 and, instead, at a greater distance, at the side where the stack 50 enters.
  • At least one supplementary heating device 70' can be, furthermore, provided externally to the pressing device 30.
  • the supplementary heating device 10’ can be arranged at a heating station 20, which is positioned, in this case, downstream of the pressing station 10 and arranged to provide a supplementary thermal power Pt' to the stack 50.
  • the heating device 70 can comprise a plurality of supplying nozzles 73 through which a heating flow, for example hot air, or steam, can be supplied towards the stack 50 of folded or interfolded laminar products.
  • a heating flow for example hot air, or steam
  • the supplying nozzles 73 can be connected to a single feeding duct 75 hydraulically connected to a device for generating the heat transfer fluid, in particular hot air, steam, etc.
  • a displacement device 41c for example, a belt, or a web, can be provided to move the worked stack 50 along a predetermined advancement direction 150.
  • the heating device 70 can comprise an element for generating microwaves, in particular a magnetron.
  • a heating chamber can be provided that is not shown in the figures for simplicity, at which the aforementioned element for generating microwaves can be configured to operate.
  • the heating device 70 can be arranged to transfer the aforementioned thermal power Pt to the worked stack 50 of laminar products by conduction, irradiation, or convention.
  • the heating device 70 can comprise electrical resistances.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

Plant (100) for producing folded or interfolded laminar products made of paper material, in particular packages of napkins, paper tissues, towels or similar products. The plant (100) comprises a pressing station (10) equipped with a displacement device (40) to move along a predetermined advancement direction (150) at least one stack (50) of folded or interfolded laminar products made of paper material. The plant (100) provides, furthermore, a pressing device (30a, 30b) arranged to move between a rest configuration, at which the stack (50) can be positioned at the pressing device same, and a pressing configuration, in which is arranged to apply a determined pressing action on the stack (50) of folded or interfolded laminar products made of paper material in order to reduce the height from a first value H1 to a second value H2 with H1<H2. A heating device (70) is, furthermore, provided configured to transfer a predetermined thermal power (Pt) to the stack (50) of laminar products made of paper material folded or interfolded, in such a way to limit any elastic return of the same at the end of the pressing step.

Description

TITLE
PLANT AND METHOD FOR PRODUCING FOLDED OR INTERFOLDED LAMINAR PRODUCTS MADE OF PAPER MATERIAL
DESCRIPTION Field of the invention
The present invention relates to the field of paper and in particular the plants and the processes for producing laminar products made of paper material, such as packages of napkins, paper tissues, and similar products. Description of the prior art
As it is known, in the paper industry many machines and processes are used for producing tissue papers, towels, napkins and similar products in packages of folded or interfolded sheets of a certain height. These are obtained by folding the processed sheets, or webs, of paper and simply by overlapping one on another or interfolding them, in such a way that at the moment of extracting a sheet from the stack also a starting edge of the following sheet is extracted, thus simplifying its use for some kinds of uses. Among the possible ways to fold the sheets are known the L or V interfolded products, with 2 panels (single-fold), or Z or W interfolded products, respectively, with 3 and 4 panels (multi-fold).
After a separation step of a stack from the following one, once that a determined height of the stack is reached, a transfer step of the packages follows for the subjecting the same to following treating and packaging steps.
Example of paper converting machines of this type are for example described in EP1457444, EP1415945 and EP1640305. In the case of interfolded products, the package exiting the head of the interfolding machine, depending on the type of interfolded product and, therefore, its final use, can be directed to a cutting machine for dividing it into packages of desired length.
Then, a packaging step of the stack of laminar products can be, furthermore, provided in order to position them into containers, such as boxes made of paper material, that are directly delivered to the users. Generally, in this way, are produced the tissue papers called "facial tissue".
Alternatively, the product can be sold in packages or banded stacks, as happens in the case of the "hand towels", which are introduced into distributors of predetermined size.
Normally, before being banded and/or packaged, the stacks of folded or interfolded laminar products, are pressed at a pressing station.
Normally, at the pressing station two pressing elements are positioned at opposite sides with respect to the stack of laminar products to be pressed in order to reduce its height from a starting height to a final height. In this way, it is possible to considerably reduce the volume of the product before subjecting the same to the following banding and/or packaging steps thereby providing saving costs, in particular due to the lower amount of packaging materials consumption, for freighting the product from the producer to the wholesalers as well as clear advantages also in terms of volumes that are necessary for storing the packaged product before and after its freight both for the producer, and the wholesalers, and the final users. A pressing station at which the aforementioned pressing step is carried out, is, for example, described in WO2019/158197.
However, normally, once that the pressing step ends, the pressed package tends to go back, at least partly, to the starting height due to the elastic return of the paper material thus making at least partly fruitless the aforementioned operation.
Another known example of a pressing station of packages of laminar products is described in SE430491. In this case, a pressing device is provided upstream of which a wetting device is arranged to wet the stack of laminar products. Downstream of the pressing device is, instead, provided a drying tunnel.
This solution does not seem to solve the aforementioned problem that occurs at the end of the pressing step in the plants of known type, and furthermore, the wetting step of the stack of laminar products provided before carrying out the pressing step, compromises the quality of the final product.
Summary of the invention
It is therefore an object of the present invention to provide a pressing unit for plants for producing laminar products, in particular but not only made of paper material, in packages, such as packages of napkins, tissue papers, towels and similar products, folded or interfolded, that is able to overcome the above-mentioned drawbacks of the prior art solutions.
It is, in particular, an object of the present invention to provide a pressing unit for plants for producing packages of laminar products made of paper material, such as packages of folded or interfolded napkins, tissue papers, towels and similar products, that is able to avoid, or anyway to limit, the elastic return of the package to the starting height once that the pressing operation ends.
It is also an object of the present invention to provide a method for producing laminar products in packages having similar advantages.
These and other objects are achieved by a plant for producing folded or interfolded laminar products made of paper material, in particular packages of napkins, tissue papers, towels, or similar products, comprising a pressing station equipped with: a displacement device configured to move along a predetermined advancement direction at least one stack of folded or interfolded laminar products made of paper material; a pressing device configured to move between a rest configuration and a pressing configuration where is arranged to apply a determined pressing action on said stack of laminar products made of paper material folded or interfolded at least at one pressing portion; whose main characteristic is that said pressing device is equipped with a heating device configured to transfer a predetermined thermal power (Pt) to the aforementioned stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least limit, any elastic return of the stack of folded or interfolded laminar products, once that the aforementioned pressing action is removed.
Other technical characteristics of the present invention and the related embodiments are set out in the dependent claims. In particular, the pressing device can comprise a first pressing member and a second pressing member which are able to move one with respect to the other between a distant configuration, corresponding to said rest configuration, in which it is possible to position between them said stack of folded or interfolded laminar products made of paper material, and a close configuration, corresponding to said pressing configuration, in which are arranged to apply said pressing action on the stack of laminar products.
In particular, the aforementioned pressing device can be provided with the aforementioned displacement device. More in particular, the displacement device can provide a first and a second displacement member associated, respectively, to the first and to the second pressing member.
In particular, the, or each, heating device can be an induction heating device.
More in particular, il, o each induction heating device can comprise: an alternating current generator configured to generate an alternating current; at least one induction member configured to be crossed by said alternating current to generate a magnetic field, said magnetic field being arranged to generate eddy currents in a heat transmission member configured to transfer said thermal power (Pt) to said stack of folded or interfolded laminar products.
In particular, an adjustment device can be, furthermore, provided configured to adjust the alternating current generated by the device for generating the alternating current, in such a way to be able to adjust the thermal power Pt transferred to the stack of laminar products made of paper material.
According to an embodiment of the invention, the heating device can comprise at least one containment chamber arranged to contain, in use, a predetermined heat transfer fluid at a predetermined temperature and pressure. More in particular, the aforementioned said heat transfer fluid, for example hot air, steam, diathermic oil, etc. is arranged to transfer the predetermined thermal power (Pt) to the, or each, heat transmission member.
According to another aspect of the invention, a method for producing stacks of folded or interfolded laminar products made of paper material, in particular packages of napkins, tissues paper, towels, or similar products, said method comprising the steps of: moving the stack of folded or interfolded laminar products made of paper material, along a predetermined advancement direction; pressing the stack of laminar products at a pressing device in such a way to reduce the height of the stack of laminar products from a first height HI to a second height H2, with H2<H1; whose main characteristic is that it is, furthermore, provided a step of transferring a predetermined thermal power (Pt) to the stack of folded or interfolded laminar products made of paper material, by a heating device of which the aforementioned pressing device is provided of, in such a way to avoid, or at least to limit any elastic return of the stack of folded or interfolded laminar products made of paper material can occur at the end of said pressing step.
According to an embodiment of the invention, the aforementioned step of transferring the predetermined thermal power (Pt) to the stack of laminar products can be carried out during said pressing step.
According to an embodiment foreseen, the aforementioned step of transferring the predetermined thermal power (Pt) to the stack of laminar products can be partly carried out at the aforementioned pressing device and partly at a heating station positioned upstream, or downstream, of the pressing station.
According to a further aspect of the invention, a plant for producing folded or interfolded laminar products made of paper material, in particular packages of napkins, paper tissues, towels or similar products, comprises a pressing station equipped with: a displacement device configured to feed at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction; a pressing device configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack of folded or interfolded laminar products made of paper material at least at one pressing portion; at least a heating device configured to transfer a predetermined thermal power (Pt) to said stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least to limit any elastic return of said stack of folded or interfolded laminar products made of paper material can occur once that said pressing action is removed; wherein said, or each, heating device is an induction heating device. According to still a further aspect of the invention, a plant for producing folded or interfolded laminar products made of paper material, in particular packages of napkins, paper tissues, towels or similar products, comprises a pressing station equipped with: a displacement device configured to feed at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction; a pressing device configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack of folded or interfolded laminar products made of paper material at least at one pressing portion; at least a heating device configured to transfer a predetermined thermal power (Pt) to said stack of folded or interfolded laminar products, made of paper material, in such a way to avoid, or at least minimize, any elastic return of said stack of folded or interfolded laminar products, made of paper material once that said pression action is removed; and wherein said displacement device comprises a first and a second displacement member positioned at opposite sides of said stack of folded or interfolded laminar products that is worked.
Brief description of the drawings
The invention will now be shown with the following description of its exemplary embodiments, exemplifying but not limitative, with reference to the attached drawings in which: - Fig. 1 diagrammatically shows a side elevation view of a first embodiment of a pressing station, according to the invention, of a plant for producing stacks of laminar products made of paper material according to the invention in a rest configuration;
- Fig. 2 diagrammatically shows a side elevation view of the pressing station of figure 1 in a pressing configuration;
- Figures 3 and 4 diagrammatically show a side elevation view of an alternative embodiment of the pressing station of figures 1 and 2, respectively in a rest configuration and in a pressing configuration;
- Fig. 5 diagrammatically shows a side elevation view, of another alternative embodiment of the pressing station of figure 1 in a pressing configuration;
- Fig. 6 diagrammatically shows a side elevation view of a further alternative embodiment of the pressing station of figure 1 in a pressing configuration;
- Fig. 7 shows in detail an enlargement of the portion of the pressing station shown in figure 6 to highlight some features of the same;
- Fig. 8 diagrammatically shows a side elevation view, of still another alternative embodiment of the pressing station of figure 1 in a pressing configuration; - Figures 9 and 10 diagrammatically show a side elevation view of still further embodiments of the pressing station of figure 1 in a pressing configuration according to the invention. Detailed description of some exemplary embodiments of the invention
With reference to figure 1, a plant for producing a laminar products, in particular made of a paper material, in particular paper, or cardboard, but also different materials, for example nonwoven fabric, folded or interfolded, for example packages of napkins, paper tissues, towels or similar products, comprises a pressing station 10 equipped with a displacement device 40 configured to feed at least one stack 50 of folded or interfolded laminar products made of paper material, at a time, along a predetermined advancement direction 150. In particular, the aforementioned laminar products made of paper material can be folded or interfolded, at a folding or interfolding unit not shown in the figure for simplicity, but anyway of known type, for example of the type described in EP1457444, or EP1630118, or W02020161571 in the name of the same Applicant .
In particular, the pressing station 10 can be equipped with a pressing device 30 configured to move from a rest configuration, in which it is possible to position at least one stack of laminar products 50 at the same (figure 1) and a pressing configuration in which is arranged to apply a pressing action on the stack 50 of laminar products to reduce its height from a first height HI to a second height H2, with H2<H1 (figure 2). More in particular, the pressing device 30 can provide a first and a second pressing member 30a and 30b which are able to move with respect to each other between a distant configuration corresponding to the aforementioned rest configuration, in which the first and second pressing members 30a and 30b are positioned at a starting distance dl greater than the height HI of the stack 50 of laminar products whereby it is possible to position the same between the pressing members 30a and 30b (figure 1), and a close configuration in which the first and second pressing members 30a and 30b are arranged to apply the aforementioned pressing action on the stack 50 of folded or interfolded laminar products made of paper material to reduce the height from a first height HI to a second height finale H2, with H1<H2 (figure 2).
In particular, as for example diagrammatically shown in the figures 1 and 2, an actuation device 80 can be provided, for example a motor, advantageously an electric motor, configured to cause the aforementioned movement of the pressing device 30 between the rest configuration and the pressing configuration. More in particular, the aforementioned actuation device 80 can be operatively connected to at least one between the first and the second pressing member 30a, or 30b by a connection portion 85, for example an actuation shaft. Furthermore, the pressing station 10 can provide a support frame 60.
In an alternative embodiment, the actuation device 80 can be an actuator, in particular a hydraulic actuator.
In the case that the actuation device 80 comprises an electric motor, the connection portion 85 can comprise devices for converting the rotational motion of the shaft of the electric motor into a linear motion, such as recirculating balls, lead screws, or other similar devices.
According to the present invention, a heating device 70 is, furthermore, provided configured to transfer a predetermined thermal power (Pt) to the stack 50 of folded or interfolded laminar products, in such a way to heat the same and avoid, or anyway, limit any elastic return of the stack 50 that could occur at the end of the pressing step, i.e. once that the pressing action is removed, which would cause to bring the height back to a value greater than the aforementioned value H2 obtained at the end of the pressing step.
In particular, the aforementioned pressing device 30 can be provided with the aforementioned heating device 70. In this way, the transfer of thermal power (Pt) to the stack 50 of folded or interfolded laminar products is carried out immediately before, immediately after, or during the pressing action, thus resulting particularly effective.
More in particular, the heating device 70 can provide at least one heat transmission member associated to at least one pressing member between the first and the second pressing member 30a and 30b, for example to the first pressing member 30a. More in particular, the heat transmission member can be arranged to apply, or transfer, the aforementioned thermal power Pt to the stack 50 of folded or interfolded laminar products.
Preferably, the heat transmission member can be at least one of the pressing portions 31a, or 31b. Advantageously, therefore, the pressing portion 31a, or 31b can be made of a metallic material.
Advantageously, the aforementioned displacement device can provide a first and a second displacement member 41a and 41b, for example a first and a second transmission belt 41a and 41b, associated respectively to the first and the second pressing member 30a and 30b. Therefore, in this case, the aforementioned displacement device is integrated in the pressing device.
In particular, the first and the second displacement member 41a and 41b, for example a first and a second transmission tape 41a and 41b, are positioned at opposite sides of the worked stack 50 and are advantageously configured to cause the stack 50 of folded or interfolded laminar products made of paper material to be positioned at the aforementioned heating device 70. In this case, the heating device 70, for example the, or each, pressing portion 31a and/or 31b, can be arranged to transfer the aforementioned thermal power Pt to the stack 50 of folded or interfolded laminar products, through the or each displacement member 41a, and/or 41b, for example the, or each, transmission tape, or the, or each, transmission belt. Preferably, the, or each, displacement member 41a, and/or 41b can be made of, or covered by, a material that is able to be resistant to high temperatures. Advantageously, the aforementioned material can be Polytetrafluoroethylene, or Teflon, or PTFE, able to be resistant up to about 260 °C.
In particular, each pressing member 30a, or 30b, can comprise a pressing plate 31a, or 31b arranged at the side opposite to the displacement member 41a, or 41b, with respect to the stack of worked laminar products 50.
Advantageously, the heating device 70 can comprise at least one induction heating device associated to at least one between the first and the second pressing member 30a, or 30b. For example, as diagrammatically shown in figure 5, the heating device 70 can comprise a first induction heating device 70a associated to the first pressing member 30a and provided with at least one induction member 72, and one second induction heating device 70b associated to the second pressing member 30b and in its turn provided with at least one induction member 72.
More precisely, each induction member 72 can be configured to be crossed by the alternating current generated by an alternating current generator, not shown in the figure for simplicity reasons. In particular, the, or each, induction member 72 is arranged to generate a magnetic field which generates eddy currents in the respective heat transmission member, for example in the respective pressing portion 31a, or 31b.
In particular, the induction heating device 70 allows to cause an accurate, localized and easy to be check, increasing of the temperature at the heat transmission member, in particular the pressing member 31a, or 31b, without any physical contact with the induction member.
As diagrammatically shown, advantageously, can be, furthermore, provided an adjustment device 200 configured to adjust the alternating current generated by the device for generating the alternating current, in such a way to adjust the thermal power Pt transferred to the stack 50 of laminar products made of paper material.
In the alternative embodiments of figure 6, the, or each, heating device 70, or 70a and 70b, provides a containment chamber 76, for example defined in a reservoir, or in a duct 75 and arranged to contain, in use, a determined quantity of a heating fluid, arranged to transfer the determined thermal power Pt to the heat transmission member, in particular to the, or each, pressing portion 31a, or 31b. In particular the heating fluid can be hot air, or steam, or diathermic oil. The heating device 70 can provide, in particular, a boiler that is not diagrammatically shown for simplicity reasons.
In particular, at least one displacement member 41a, or 41b, and the respective pressing member 31a, or 31b can be, respectively, provided with at least one hole 42 and 32 through which the aforementioned heating device 70 can be arranged to transfer the aforementioned thermal power Pt to the stack 50 of worked laminar products. More in particular, the aforementioned holes 42 and 32 are arranged to a be aligned in a determined relative position between the displacement member 41a, or 41b and the respective pressing member 31a, or 31b.
In an embodiment foreseen by the invention and diagrammatically shown in figure 7, the or each displacement member 41a, or 41b, and the respective pressing member 31a, or 31b, are respectively provided with a plurality of holes 42 and 32.
In particular, in the case that the device for transferring the aforementioned thermal power Pt provides at least one containment chamber 76, this can be opened on a side facing towards the displacement member 41a, or 41b associated to the same. More in particular, the feeding of the heat transfer fluid into the, or each, containment chamber 76 can be carried out only at predetermined intervals of time, or when a detection member, not shown in the figure for simplicity reasons, for example a sensor of presence, signals the presence of the stack 50 of laminar products in a predetermined position with respect to the heating device 70, for example at the pressing station 10.
Generally, the possibility is foreseen that the displacement device 40, for example the first and second transmission belts 41a, 41b of the pressing station 10, can operate continuously, that means without stopping the stack 50 of laminar products made of paper material, or in discontinuously. In the latter case, the displacement device 40 can be configured to position the or each stack 50 of laminar products at a predetermined position within the pressing station and to stop the same in order to give the heating device 70 the possibility of transferring the aforementioned thermal power Pt to the stack 50, and then starting again in such a way to discharge the pressed stack 50 downstream of the pressing station 10 in order to subject the same to following operations, if foreseen.
In particular, at least one transmission belt 41a, or 41b can be provided with at least one hole 42 (see figure 7) through which the heating device 70 can be arranged to apply the aforementioned thermal power Pt to the worked stack 50 of laminar products, case not shown in the figure for simplicity reasons. As diagrammatically shown in figure 6, the aforementioned containment chamber 76 is, advantageously, provided with at least one inlet through which the heat transfer fluid can be fed into the same through at least one inlet duct 77 and at least an outlet through which the heat transfer fluid can be discharged through at least one exit duct 78 once that the aforementioned thermal power Pt stack 50 has been transferred to the worked laminar products.
In a possible further alternative embodiment of the invention, diagrammatically shown in figure 8, at least one between the first and the second pressing member 30a and 30b can be inclined at a predetermined angle with respect to the horizontal direction, for example an angle comprised between 2° and 30° in such a way to form a "funnel" and to avoid that the feeding motion of the stack 50 of laminar products through the pressing station 10, can cause a not homogeneous pressing of the same along a longitudinal direction. More precisely, the first and second pressing members 30a and 30b are inclined in such a way to be closer one to the other at the side where the pressed stack 50 exits the pressing device 30 and, instead, at a greater distance, at the side where the stack 50 enters.
Advantageously, at least one supplementary heating device 70' can be, furthermore, provided externally to the pressing device 30.
In particular, as diagrammatically shown in the embodiment of figure 9, a supplementary heating device 10’, for example of the type described above with reference to figure 5, can be provided that is positioned at a heating station 20 positioned downstream of the pressing device 30. More in particular, at the supplementary heating device 10’ a supplementary thermal power Pt' is transferred to the worked stack 50. In this case, therefore, the total thermal power Pttot=Pt+Pt' that is transferred as a whole to the worked stack 50 is partly provided upstream of the pressing device 30, and partly provided downstream of the pressing device 30.
Alternatively, as diagrammatically shown in the embodiment of figure 10, the supplementary heating device 10’ can be arranged at a heating station 20, which is positioned, in this case, downstream of the pressing station 10 and arranged to provide a supplementary thermal power Pt' to the stack 50. In this case, therefore, the total thermal power Pttot=Pt+Pt' that is transferred to the worked stack 50 is partly provided at the pressing device 30 and partly downstream of this.
In particular, the heating device 70, advantageously supported on a support structure 170, can comprise a plurality of supplying nozzles 73 through which a heating flow, for example hot air, or steam, can be supplied towards the stack 50 of folded or interfolded laminar products. For example, the supplying nozzles 73 can be connected to a single feeding duct 75 hydraulically connected to a device for generating the heat transfer fluid, in particular hot air, steam, etc. Furthermore, at the heating station 20 a displacement device 41c, for example, a belt, or a web, can be provided to move the worked stack 50 along a predetermined advancement direction 150.
In an embodiment foreseen by the invention, the heating device 70 can comprise an element for generating microwaves, in particular a magnetron. In this case, a heating chamber can be provided that is not shown in the figures for simplicity, at which the aforementioned element for generating microwaves can be configured to operate.
Generally, the heating device 70, according to the present invention, as well as the supplementary heating device 70', if present, can be arranged to transfer the aforementioned thermal power Pt to the worked stack 50 of laminar products by conduction, irradiation, or convention. For example, the heating device 70 can comprise electrical resistances.
The foregoing description exemplary embodiments of the invention will so fully reveal the invention according to the conceptual point of view, so that others, by applying current knowledge, will be able to modify and/or adapt for various applications such embodiment without further research and without parting from the invention, and, accordingly, it is therefore to be understood that such adaptations and modifications will have to be considered as equivalent to the specific embodiments. The means and the materials to realize the different functions described herein could have a different nature without, for this reason, departing from the field of the invention. It is to be understood that the phraseology or terminology that is employed herein is for the purpose of description and not of limitation.

Claims

1. Plant for producing laminar products made of paper material folded or interfolded, in particular packages of napkins, paper tissues, towels or similar products, said plant comprising a pressing station (10) equipped with: a displacement device (40) configured to move at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction (150); a pressing device (30) configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack (50) of folded or interfolded laminar products made of paper material at least at one pressing portion (31a,31b); said plant being characterized in that said pressing device (30) is equipped with a heating device (70) configured to transfer a predetermined thermal power (Pt) to said stack (50) of folded or interfolded laminar products made of paper material, in such a way to avoid, or at least minimize, any elastic return of said stack (50) of folded or interfolded laminar products made of paper material once that said pression action is removed.
2. Plant according to claim 1 wherein said pressing device (30) comprises a first pressing member (30a) provided with a first pressing portion (31a), and a second pressing member (30b) provided with a second pressing portion (31b).
3. Plant according to claim 2 wherein said first and second pressing members (30a,30b) are adapted to move one with respect to the other between a spaced configuration, corresponding to said rest configuration, in which said stack (50) of folded or interfolded laminar products of paper material can be positioned between said first and said second pressing member (30a,30b), and a close configuration, corresponding to said pressing configuration, in which said first and second pressing members (30a,30b) are arranged to apply said pressing action on said stack (50) of folded or interfolded laminar products made of paper material.
4. Plant according to any one of the previous claims wherein said pressing device (30) is equipped with said or each displacement device (41a,41b).
5. Plant according to any one of the previous claims wherein said or each heating device (70) is an induction heating device.
6. Plant according to claim 5, wherein said induction heating device (70) comprises: an alternating current generator configured to generate an alternating current; at least one induction member (72) configured to be crossed by said alternating current to generate a magnetic field, said magnetic field being arranged to generate eddy currents in said pressing portion (31a,31b) in such a way to transfer said thermal power (Pt) to said stack of folded or interfolded laminar products (50).
7. Plant according to claim 6 wherein an adjustment device (200) is, furthermore, provided configured to adjust said alternating current generated by said device for generating alternating current, in such a way to adjust said thermal power (Pt) applied to said stack (50) of folded or interfolded laminar products made of paper.
8. Plant according to any claim from 1 to 4 wherein said heating device (70) comprises at least one containment chamber (76a,76b) arranged to contain, in use, a predetermined heat transfer fluid at a predetermined temperature and pressure, said heat transfer fluid being arranged to transfer said predetermined thermal power (Pt) to said, or each, pressing portion (31a,31b) arranged to transfer said thermal power (Pt) to said stack (50) of folded or interfolded laminar products that is worked.
9. Plant according to any one of the previous claims wherein said displacement device (41a,41b) comprises a first and a second displacement member positioned at opposite sides of said stack (50) of folded or interfolded laminar products that is worked.
10. Plant according to any one of the previous claims wherein said heating device (70) is configured to transfer said thermal power to said stack (50) of folded or interfolded laminar products, through at least one between said first and second displacement members (41a,41b) made of, or covered by, a material resistant to high temperatures.
11. Plant according to claim 9 wherein said material resistant to high temperatures is
Polytetrafluoroethylene (PTFE).
12. Plant according to any one of the previous claims, wherein a supplementary heating device (70') is furthermore provided positioned upstream or downstream of said pressing device (30), said supplementary heating device (70') being arranged to transfer a predetermined supplementary thermal power (Ptf ) to said stack of laminar products (50) upstream or downstream of said pressing device (30).
13. Plant according to any claim from 2 to 12, wherein at least one between said first and said second pressing member (30a,30b) is inclined with respect to the horizontal at a predetermined angle a, in such a way that said first and second pressing members (30a,30b) are arranged more distant from each other at the side at which said stack (50) enters into said pressing device (30) and closer to each other at the side at which said pressed stack (50) exits said pressing device (30).
14 . Plant for producing folded or interfolded laminar products made of paper material, in particular packages of napkins, paper tissues, towels or similar products, said plant comprising a pressing station (10) equipped with: a displacement device (40) configured to feed at least one stack of folded or interfolded laminar products made of paper material along a predetermined advancement direction (150); a pressing device (30) configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack (50) of folded or interfolded laminar products made of paper material at least at one pressing portion (31a,31b); at least a heating device (70) configured to transfer a predetermined thermal power (Pt) to said stack (50) of folded or interfolded laminar products made of paper material, in such a way to avoid, or at least minimize, any elastic return of said stack (50) of folded or interfolded laminar products made of paper material, once that said pression action is removed; said plant being characterized in that said or each heating device (70) is an induction heating device.
15 . Plant for producing laminar products made of paper material folded or interfolded, in particular packages of napkins, paper tissues, towels or similar products, said plant comprising a pressing station (10) equipped with: a displacement device (40) configured to feed at least one stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction (150); a pressing device (30) configured to move between a rest configuration and a pressing configuration in which is arranged to apply a determined pressing action on said stack (50) of folded or interfolded laminar products made of paper material at least at one pressing portion (31a,31b); at least a heating device (70) configured to transfer a predetermined thermal power (Pt) to said stack (50) of folded or interfolded laminar products made of paper material, in such a way to avoid, or at least minimize, any elastic return of said stack (50) of folded or interfolded laminar products made of paper material once that said pression action is removed; said plant being characterized in that said displacement device (40) comprises a first and a second displacement member (41a,41b) positioned at opposite sides of said stack (50) of folded or interfolded laminar products that is worked.
16. Plant according to claim 15 wherein said heating device (70) is configured to transfer said thermal power to said stack (50) of folded or interfolded laminar products, by at least one between said first and second displacement members (41a,41b) made of, or covered by, a material resistant to high temperatures.
17 . Method for producing packages of folded or interfolded laminar products made of paper material, in particular packages of napkins, paper tissues, towels or similar products, said method comprising the steps of: moving said stack of laminar products made of paper material folded or interfolded, along a predetermined advancement direction (150); pressing said stack of laminar products by a pressing device (30) in such a way to reduce the height of said stack of laminar products from a first height HI to a second height H2, with H2<H1; said method being characterized in that a heating step is, furthermore, provided to transfer a predetermined thermal power (Pt) to said stack of laminar products (50) made of paper material folded or interfolded, and in that said transferring step of said predetermined thermal power (Pt) occurs at said pressing device (30) in such a way to avoid, or at least minimize, any elastic return of said stack of laminar products (50) made of paper material folded or interfolded at the end of said pressing step.
18 . Method according to claim 17, wherein a transferring step is, furthermore, provided for transferring a predetermined supplementary thermal power (Ptf ) to said stack of laminar products (50) carried out at a supplementary heating device (70') positioned upstream or downstream of said pressing device (30).
PCT/IB2022/053142 2021-04-08 2022-04-05 Plant and method for producing folded or interfolded laminar products made of paper material WO2022214949A1 (en)

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US3504064A (en) * 1968-02-26 1970-03-31 Floral Dev Corp Method of compressing and subsequently re - expanding urea - formaldehyde foam
US4399619A (en) * 1980-05-20 1983-08-23 Martin Jean Marie M Machine for drying and butt-jointing wood veneer by continuous contact engagement
SE430491B (en) * 1982-04-15 1983-11-21 Patara Ag Method for packing paper
US20160137450A1 (en) * 2014-11-17 2016-05-19 Curt G. Joa, Inc. Adhesive contamination resistant web processing unit
WO2019219168A1 (en) * 2018-05-15 2019-11-21 Essity Hygiene And Health Aktiebolag Method for compressing structured tissues

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3504064A (en) * 1968-02-26 1970-03-31 Floral Dev Corp Method of compressing and subsequently re - expanding urea - formaldehyde foam
US4399619A (en) * 1980-05-20 1983-08-23 Martin Jean Marie M Machine for drying and butt-jointing wood veneer by continuous contact engagement
SE430491B (en) * 1982-04-15 1983-11-21 Patara Ag Method for packing paper
US20160137450A1 (en) * 2014-11-17 2016-05-19 Curt G. Joa, Inc. Adhesive contamination resistant web processing unit
WO2019219168A1 (en) * 2018-05-15 2019-11-21 Essity Hygiene And Health Aktiebolag Method for compressing structured tissues

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