US20210292126A1 - Suction roll for paper converting machines - Google Patents

Suction roll for paper converting machines Download PDF

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Publication number
US20210292126A1
US20210292126A1 US17/263,106 US201917263106A US2021292126A1 US 20210292126 A1 US20210292126 A1 US 20210292126A1 US 201917263106 A US201917263106 A US 201917263106A US 2021292126 A1 US2021292126 A1 US 2021292126A1
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US
United States
Prior art keywords
suction
roll
folding
paper
interfolding
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.)
Pending
Application number
US17/263,106
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English (en)
Inventor
Paolo Casotti
Sergio Lombardi
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.)
MTC Macchine Trasformazione Carta SRL
Original Assignee
MTC Macchine Trasformazione Carta SRL
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 MTC Macchine Trasformazione Carta SRL filed Critical MTC Macchine Trasformazione Carta SRL
Assigned to M.T.C. - MACCHINE TRASFORMAZIONE CARTA S.R.L. reassignment M.T.C. - MACCHINE TRASFORMAZIONE CARTA S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LOMBARDI, Sergio
Assigned to M.T.C. - MACCHINE TRASFORMAZIONE CARTA S.R.L. reassignment M.T.C. - MACCHINE TRASFORMAZIONE CARTA S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CASOTTI, Paolo
Publication of US20210292126A1 publication Critical patent/US20210292126A1/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/24—Interfolding sheets, e.g. cigarette or toilet papers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H45/00—Folding thin material
    • B65H45/12—Folding articles or webs with application of pressure to define or form crease lines
    • B65H45/16—Rotary folders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2406/00—Means using fluid
    • B65H2406/30—Suction means
    • B65H2406/36—Means for producing, distributing or controlling suction
    • B65H2406/361—Means for producing, distributing or controlling suction distributing vacuum from stationary element to movable element
    • B65H2406/3614—Means for producing, distributing or controlling suction distributing vacuum from stationary element to movable element involving a shoe in sliding contact with an inner section of the periphery of a rotating element

Definitions

  • the present invention relates to the technical field of paper converting and related products, and in particular relates to a machine for interfolding a web, or sheet of paper, equipped with at least a suction roll, in particular a folding, or interfolding, roll, providing a particular arrangement of the suction holes, which connected to a vacuum generation system, cause the sheet, or web, of paper to adhere on the roll surface.
  • these systems are used to carry out the fundamental operations of cutting the paper, or transferring very quickly the paper same from a roll to another one, or also folding the paper.
  • the systems causing the above mentioned adhesion provide mechanical clamps, or pneumatic suction systems.
  • a device for generating a determined vacuum level, that is pneumatically connected with the internal part of the rolls. More precisely, the surface of the advancing rolls provides a determined number of couples of longitudinal rows of suction holes, normally 3, or 4, couples of rows of holes. These are pneumatically connected to the vacuum generation device in such a way to cause the processed paper to adhere at a determined sector of the roll surface.
  • a known kind of advancing rolls provides a bell distributor that is coupled to the roll for folding, or interfolding, at an its end, and that divides the roll surface in sectors where the paper is sucked, i.e. where the rows of holes suck, and in sectors where the processed sheet is, instead, not held by the roll and, therefore, can be transferred on another roll, for example in order to carry out the folding of the sheet.
  • the folding, or interfolding method provides to transversally cut, or separated by tears, the sheets obtained from at least a web. Then, a staggering of the sheets is obtained, in order to create a sequence of staggered sheets. These are, then, transferred on rolls for folding, or interfolding, having rows of suction holes in order to alternatingly hold the sheets on their surfaces and to obtain an interfolded configuration.
  • the rolls for folding, or interfolding, described in EP0982256 provide a determined number of couples of rows of suction holes distributed on the surface of the interfolding rolls.
  • the suction holes of each couple are oriented according to parallel directions.
  • the 2 close rows of suction holes that means the one sucking the tail of a sheet, and the one sucking the head of the following sheet, does not release the respective processed sheet, or web, of paper at a same angular position, that means corresponding to a same central angle.
  • the “folding fingers” operates to transfer the sheets 100 ′ a and 100 ′ b on a formation table positioned downstream of the rolls for folding, or interfolding, the above mentioned folds and wrinkles 105 ′ of the sheets are also produced in the forming stack, i.e. in the stack of folded, or interfolded, sheets, thus compromising the quality of the final product.
  • an object of the present invention to provide a folding, or interfolding, roll, that is able to avoid folds, or “wrinkles”, on the processed sheets and therefore to guarantee to obtain a final product of excellent quality.
  • a roll, according to the invention for folding, or interfolding a web, or sheet of paper, fed along an advancing direction in a paper converting machine, or similar machines, said roll for folding, or interfolding, comprising:
  • each suction group can comprise at least 4 close longitudinal rows of suction holes.
  • the above mentioned incident planes intersect each other in a line (ti) parallel to the longitudinal rotation axis of the roll.
  • intersection line (ti) is positioned at a distance d i from the above disclosed suction holes that is smaller than the distance of the external lateral surface from radius r of roll.
  • the above mentioned incident planes form an angle ⁇ , more in particular a plurality of angles ⁇ , each of which having a predetermined amplitude, for example, an amplitude comprised between 1° and 5°.
  • the close longitudinal rows of the suction holes of the same suction group are aligned with respect to the direction longitudinal to roll. Therefore, the axes of the suction holes of the close longitudinal rows of each suction group lie on the same plane orthogonal to said longitudinal rotation axis.
  • At least two rows of the close longitudinal rows of suction holes of a same suction group are staggered to each other longitudinally to roll. Therefore, in this case, the axes of the respective suction holes lie on different planes.
  • a machine for folding, or interfolding a web, or sheet, of paper comprises an interfolding unit equipped with a first and a second interfolding roll, as above disclosed, configured to counter-rotate.
  • a method for making the suction holes of a roll for folding, or interfolding, in a paper converting machine comprises the steps of:
  • FIG. 1 diagrammatically shows a folding, or interfolding, unit, of prior art
  • FIG. 2 shows an enlargement of the releasing zone of the sheets in machine in FIG. 1 in order to highlight some characteristics
  • FIG. 3 diagrammatically shows in a perspective side elevation view a first embodiment of a roll for folding, or interfolding, according to the invention
  • FIG. 4 diagrammatically shows an enlargement partially sectioned, of a portion of the external lateral surface of the roll for folding, or interfolding of FIG. 3 ;
  • FIG. 5 diagrammatically shows a first embodiment of a folding, or interfolding, unit, according to the present invention
  • FIG. 6 shows an enlargement of the releasing zone of the sheets in the machine of FIG. 5 in order to highlight some technical characteristics
  • FIG. 7 diagrammatically shows in a perspective side elevation view an alternative embodiment of the roll for folding, or interfolding, FIG. 5 ;
  • FIG. 8 diagrammatically shows an enlargement partially sectioned, of a portion of the external lateral surface of the roll for folding, or interfolding, of FIG. 7 ;
  • FIG. 9 diagrammatically shows a folding, or interfolding, unit, equipped with 2 rolls for folding, or interfolding, according to the invention.
  • FIG. 10 shows an enlargement of the realising zone of the sheets in the machine of FIG. 9 in order to highlight some technical characteristics
  • FIG. 11 diagrammatically shows an enlargement of a suction group of a further alternative embodiment of a roll for folding, or interfolding, according to the present invention.
  • a roll 1 for folding, or interfolding, a web, or sheet, of paper, 100 fed along an advancing direction in a paper converting machine, or similar machines comprises a tubular body 10 configured to rotate about a longitudinal rotation axis 101 . More precisely, the tubular body 10 of roll 1 has an external lateral surface 11 and an internal lateral surface 12 pneumatically communicating through a plurality of suction holes 3 .
  • the suction holes 3 of roll 1 are organized in a predetermined number of suction groups, for example 3 suction groups 60 a, 60 b, 60 c positioned in predetermined angular positions of roll 1 , for example each 120°.
  • each suction group 60 a - 60 c comprises at least 3 close longitudinal rows 30 a, 30 b and 30 c of suction holes 3 a - 3 c.
  • the roll 1 for folding, or interfolding furthermore, provides a suction chamber 20 arranged internally to the above mentioned tubular body 10 , and pneumatically connected to a suction device, not shown in the figure for reasons of simplicity, but, however, of known type to a skilled person in the field, and configured to generate a predetermined vacuum level.
  • a vacuum distribution device 50 is, furthermore, provided positioned between the internal lateral surface 12 of roll 1 and the suction chamber 20 . More precisely, the vacuum distribution device 50 is configured to selectively put in pneumatic connection 1 a suction chamber 20 with at least a row 30 a - 30 c of suction holes 3 a - 3 c of the above mentioned plurality, at predetermined angular positions of the tubular body 10 .
  • the suction of a processed sheet, or web, of paper 100 is carried out and its adhesion only at determinate portions of the external lateral surface 11 of roll 1 . Therefore, the particular technical solution of the present invention with respect to the prior art solutions, in addition to the two close longitudinal rows 30 a and 30 b of holes 3 a and 3 b that are normally present in each suction group of the suction rolls of the interfolding, or folding, machines of the prior art, provides for each suction group 60 a - 60 c, at least a further row 30 c of suction holes 3 c close to the first two.
  • the technical solution according to the invention allows to control the folding of the first half of the whole sheet, in the case of FIG. 6 the sheet 100 b coming from right roll 1 b, on which the tail of the previous sheet is overlapped, in figure, the sheet 100 a coming from the left roll.
  • the auxiliary suction holes 3 c of the longitudinal rows 30 c are arranged downstream of the “standard” holes 3 a and 3 b of the respective group 60 a , with respect to the rotation direction of the rolls 1 a and 1 b for folding, or interfolding. Therefore, it is possible to avoid that folds, or wrinkles, can be formed, thus considerably increasing the quality of the final product with respect to the prior art solutions.
  • each suction group 60 a - 60 c provides 4 close longitudinal rows 30 a - 30 d of suction holes 3 a - 3 d. In this way, it is possible to further increase the accuracy of the fold of the sheet 100 b when the same releases the respective roll 1 b.
  • each suction group 60 a - 60 c comprises 3, or 4, close longitudinal rows 30 a - 30 c, or 30 a - 30 d, of suction holes 3 a - 3 c, or 3 a - 3 d
  • at least 2 of the close longitudinal rows of each suction group 60 a - 60 c can be positioned according to the directions lying on incident planes ⁇ a, ⁇ b, ⁇ c, ⁇ d. In this way the sheet 100 held due to the suction action of the holes 3 a, 3 b, 3 c, 3 d on the external lateral surface 11 of roll 1 , is released at a same releasing angle, i.e.
  • At least 2 of the above mentioned close longitudinal rows 30 a - 30 c, or 30 a - 30 d, of rows of suction holes, of each suction group 60 a - 60 c are staggered to each other along the direction longitudinal to roll 1 .
  • the suction holes 3 a - 3 c, or 3 a - 3 d , of each suction group 60 a - 60 c are, therefore, arranged at respective directions that can intersect each other before reaching axis 101 of the roll 1 for folding, or interfolding.
  • the close longitudinal rows 30 a - 30 d of the same suction group 60 a - 60 d are arranged aligned with respect to the direction longitudinal to the roll 1 . Therefore, the axes 103 a - 103 d of the suction holes 3 a - 3 d of a same suction group 60 a - 60 d lie on a same plane orthogonal to the longitudinal rotation axis 101 .
  • the axes 103 a - 103 d of the suction holes 3 a - 3 d of at least a same suction group 60 a - 60 d, that are positioned on a same circumference coaxial to the longitudinal rotation axis 101 of roll 1 are positioned on a plane orthogonal to the longitudinal rotation axis 101 .
  • the above mentioned incident planes ⁇ a- ⁇ d define angles ⁇ 1 - ⁇ 3 .
  • amplitude advantageously an amplitude, anyway, comprised between 0.1° and 5°, preferably between 1° and 5°.
  • the amplitude of the above mentioned angles can be comprised between 2° and 20°, advantageously between 4° and 15°.
  • the suction holes 3 a - 3 c, or 3 a - 3 d, of 2 the close longitudinal rows 30 a and 30 b are oriented with the respective axes 103 a - 103 d positioned along respective skew directions that means belonging to different planes.
  • a “mixed” solution of the above mentioned embodiments is also possible, i.e.
  • roll 1 for folding, or interfolding provides a plurality of suction holes comprising both suction groups with close rows 30 a - 30 d of suction holes 3 a - 3 d such that the axes 103 a - 103 d of the suction holes of at least two close longitudinal rows 30 a - 30 d of a same group 60 a - 60 d are arranged on a same plane orthogonal to the longitudinal rotation axis 101 of roll 1 , and suction groups 60 wherein the close longitudinal rows 30 a - 30 c, or 30 a - 30 d, are longitudinally staggered to each other.
  • FIGS. 5 and 9 two different embodiments are diagrammatically shown having, respectively, 3 close longitudinal rows 30 a - 30 c, and 4 close longitudinal rows 30 a - 30 d for each suction group 60 a - 60 c, of a folding, or interfolding, unit of a paper converting machine, equipped with first and second rolls 1 a and 1 b for folding, or interfolding, according to the invention configured in such a way to be counter-rotating.
  • the vacuum distribution device 50 can provide a fixed tubular body 25 coaxially mounted within the above mentioned tubular body 10 , communicating with a system for generating a predetermined vacuum level. More precisely, the fixed tubular body 25 provides an opening 26 and is associated to two walls 27 a and 27 b arranged longitudinally to tubular body 10 . In this way, the volume delimited between the two walls 27 a and 27 b, the fixed tubular body 25 and the internal surface 12 of roll 1 define the above mentioned suction chamber 20 constantly pneumatically communicating with the vacuum generation system.
  • the rotation of roll about its longitudinal rotation axis 101 selectively brings the different longitudinal rows 30 a - 30 c of suction holes 3 a - 3 c of roll 1 to pneumatically communicate with the vacuum generation system, thus causing the adhesion of the web, or sheet, of paper on the roll surface, between the position of the first longitudinal wall 27 a and the position of the second longitudinal wall 27 b.
  • the two longitudinal walls 27 a and 27 b at ends directed towards the internal surface 12 of roll 1 , are advantageously provided of pneumatic sealing elements 28 a and 28 b, in particular made of rubber, plastic, or similar materials, in order to guarantee the necessary conditions of pneumatic sealing, thus insulating the suction chamber from the remaining portion of volume defined between the internal surface 12 of roll 1 and the fixed tubular body 25 .
  • the longitudinal walls 27 a, 27 b can provide push elements, preferably springs, not shown in the figure for reasons of simplicity, and configured to push the above mentioned sealing elements 28 a and 28 b against the internal surface 12 of roll 1 .

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  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Paper (AREA)
US17/263,106 2018-07-26 2019-07-25 Suction roll for paper converting machines Pending US20210292126A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT102018000007517 2018-07-26
IT102018000007517A IT201800007517A1 (it) 2018-07-26 2018-07-26 Rullo di aspirazione di tipo perfezionato per macchine per la trasformazione della carta
PCT/IB2019/056364 WO2020021490A1 (en) 2018-07-26 2019-07-25 Improved suction roll for paper converting machines

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US20210292126A1 true US20210292126A1 (en) 2021-09-23

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ID=63840917

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Application Number Title Priority Date Filing Date
US17/263,106 Pending US20210292126A1 (en) 2018-07-26 2019-07-25 Suction roll for paper converting machines

Country Status (6)

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US (1) US20210292126A1 (zh)
EP (1) EP3826950B1 (zh)
CN (1) CN112469651A (zh)
BR (1) BR112021001243A2 (zh)
IT (1) IT201800007517A1 (zh)
WO (1) WO2020021490A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111591824B (zh) * 2020-05-14 2023-04-21 杨传萌 用于折叠一卷纸材的折纸机

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6024685A (en) * 1995-03-03 2000-02-15 Winkler +Dunnebier Maschinenfabrik Und Eisengiesserei Kg Runner for a creaser and creaser
WO2018028980A1 (de) * 2016-08-10 2018-02-15 Koenig & Bauer Ag Maschinenanordnung mit druckeinrichtung zum sequentiellen bearbeiten bogenförmiger substrate
US10449746B2 (en) * 2016-06-27 2019-10-22 C. G. Bretting Manufacturing Co., Inc. Web processing system with multiple folding arrangements fed by a single web handling arrangement
EP3693307A1 (en) * 2019-02-01 2020-08-12 CHAN LI Machinery Co., Ltd Folding machine for folding fibre products and stack of fibre products produced thereby

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US843781A (en) * 1904-12-31 1907-02-12 Seth Wheeler Apparatus for cutting, folding, and interfolding sheets or units.
JPH0266067A (ja) * 1988-08-31 1990-03-06 Taiyo Plant Kk ポリエチレン袋折りたたみ装置
DK0439046T3 (da) 1990-01-22 1993-12-27 Atd Corp Måtte med køleplade og termisk isolerende områder
US5176611A (en) * 1992-01-21 1993-01-05 Vermehren H Richard Sealing assembly attachment and method
ES2279564T3 (es) 1998-08-21 2007-08-16 M T C - Macchine Trasformazione Carta S.R.L. Metodo de interplegado de material de hojas y maquina para llevar a cabo tal metodo.
EP1457444B2 (en) 2003-02-18 2018-10-24 M T C - Macchine Trasformazione Carta S.r.l. Interfolding machine of a web or sheet of paper with a vacuum conveying roller
US8602198B2 (en) * 2010-12-17 2013-12-10 Kimberly-Clark Worldwide, Inc. Vacuum roll and method of use

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6024685A (en) * 1995-03-03 2000-02-15 Winkler +Dunnebier Maschinenfabrik Und Eisengiesserei Kg Runner for a creaser and creaser
US10449746B2 (en) * 2016-06-27 2019-10-22 C. G. Bretting Manufacturing Co., Inc. Web processing system with multiple folding arrangements fed by a single web handling arrangement
WO2018028980A1 (de) * 2016-08-10 2018-02-15 Koenig & Bauer Ag Maschinenanordnung mit druckeinrichtung zum sequentiellen bearbeiten bogenförmiger substrate
EP3693307A1 (en) * 2019-02-01 2020-08-12 CHAN LI Machinery Co., Ltd Folding machine for folding fibre products and stack of fibre products produced thereby

Also Published As

Publication number Publication date
WO2020021490A1 (en) 2020-01-30
EP3826950B1 (en) 2024-07-17
IT201800007517A1 (it) 2020-01-26
CN112469651A (zh) 2021-03-09
BR112021001243A2 (pt) 2021-04-20
EP3826950A1 (en) 2021-06-02

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