EP1933653A1 - Equipment for processing at least one strip of filter material in the tabacco industry - Google Patents

Equipment for processing at least one strip of filter material in the tabacco industry

Info

Publication number
EP1933653A1
EP1933653A1 EP06744484A EP06744484A EP1933653A1 EP 1933653 A1 EP1933653 A1 EP 1933653A1 EP 06744484 A EP06744484 A EP 06744484A EP 06744484 A EP06744484 A EP 06744484A EP 1933653 A1 EP1933653 A1 EP 1933653A1
Authority
EP
European Patent Office
Prior art keywords
equipment
strip
active portion
filter material
thread
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.)
Granted
Application number
EP06744484A
Other languages
German (de)
French (fr)
Other versions
EP1933653B2 (en
EP1933653B1 (en
Inventor
Armando Turrini
Leonardo Balletti
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.)
GD SpA
Original Assignee
GD SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=36636233&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1933653(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by GD SpA filed Critical GD SpA
Publication of EP1933653A1 publication Critical patent/EP1933653A1/en
Application granted granted Critical
Publication of EP1933653B1 publication Critical patent/EP1933653B1/en
Publication of EP1933653B2 publication Critical patent/EP1933653B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24D—CIGARS; CIGARETTES; TOBACCO SMOKE FILTERS; MOUTHPIECES FOR CIGARS OR CIGARETTES; MANUFACTURE OF TOBACCO SMOKE FILTERS OR MOUTHPIECES
    • A24D3/00—Tobacco smoke filters, e.g. filter-tips, filtering inserts; Filters specially adapted for simulated smoking devices; Mouthpieces for cigars or cigarettes
    • A24D3/02—Manufacture of tobacco smoke filters
    • A24D3/0204—Preliminary operations before the filter rod forming process, e.g. crimping, blooming

Definitions

  • the present invention relates to equipment for processing at least one strip of filter material in the tobacco industry.
  • the prior art embraces equipment for processing a strip of filter material fed along a predetermined path and caused, as it advances along the path, to undergo a succession of processing .steps before being directed into a filter making machine.
  • these steps will consist in a longitudinal and/or transverse pulling or stretching operation, and a step of treating the strip with additive materials.
  • the aforementioned pulling or stretching operation is accomplished using pairs of rollers, each composed typically of a threaded roller and an anvil roller.
  • the object of the present invention is to provide equipment for processing at least one strip of filter material, such as will be unaffected by the drawbacks mentioned above .
  • the stated object is duly realized in equipment according to the present invention for processing at least one strip of filter material, in the tobacco industry, as characterized in one or more of the claims appended .
  • -figure 1 is a schematic front view of equipment for processing a strip of filter material
  • FIG. 1 shows a detail of figure 1, viewed from the side and partly in section;
  • -figure 7 shows a detail of figure 2, enlarged and under operating conditions;
  • -figure 8 is a schematic plan view of equipment for processing two strips of filter material.
  • numeral 1 denotes equipment, in its entirety, for processing a strip 2 of filter as used in the tobacco industry, interposed between a feed unit 3 supplying the strip 2 and a filter maker, or filter assembly section, represented schematically as a block denoted 4.
  • the feed unit 3 , the equipment 1 and the section denoted 4 constitute interoperative parts of a filter maker which, with the exception of the equipment 1 disclosed, is of familiar type and therefore neither illustrated nor described in detail.
  • the equipment 1 comprises a pair of guide rollers 5 and 6 combining in operation one with another, and next in sequence, along a processing path denoted P, means denoted 7, in their entirety, by which the strip 2 is stretched and pulled longitudinally and/or transversely. Further along, the equipment 1 comprises treatment means 8 by which additives such as a plasticizing compound are applied to the strip 2 of filter material.
  • numerals 9 and 10 denoted two further guide rollers by which the strip 2 is directed toward the filter maker 4.
  • the longitudinal and/or transverse stretching and pulling means 7 include at least one pair of rollers comprising a top roller 11 of which the axis 11a is disposed transversely to the processing path P, and an anvil roller 12 of which the axis 12a lies parallel to the former axis 11a.
  • the upstream guide rollers 5 and 6, the processing rollers 11 and 12 and the downstream guide rollers 9 and 10 combine to provide means by which the strip 2 is fed along the processing path P.
  • a second pair of stretching and pulling rollers comprising a roller 13 of which the axis 13a is disposed transversely to the processing path P, and an anvil roller 14 of which the axis 14a lies parallel to the former axis 13a.
  • the equipment 1 might incorporate any number of paired stretching and pulling rollers.
  • the outer cylindrical surface of the top roller 11 presents a helical thread 15, whilst the anvil roller 12 is faced with resilient material.
  • the helical thread 15 describes a sinuous profile 16, with each turn presenting a crest portion denoted 17, compassed between two roots 18 connected to the crest portion 17 by way of relative flanks 19.
  • the aforementioned portions 20 are incorporated in such a way as to lie substantially tangential to the active portion 17 at all points.
  • the portions 20 in question will present a preferably constant radius of curvature, although the radius of curvature might also be variable.
  • the ratio between the size of the active portion 17, denoted D, and the pitch p of the helical thread 15, denoted 21, is nominally 0.25 and more broadly might be between 0.22 and 0.28.
  • the ratio between the size D of the active portion 17 and the pitch 21 of the helical thread 15 is nominally 0.5, and more broadly might be between 0.48 and 0.53.
  • the ratio between the size D of the active portion 17 and the pitch 21 of the helical thread 15 is nominally 0.75, and more broadly might be between 0.72 and 0.78.
  • the active portions 17 are merged with the flanks 19 by way of smooth or rounded portions 20 and present an arcuate profile.
  • the strip 2 of material passing between the threaded roller 11 and the roller 12 of resilient material will be deformed, but without suffering any damage, and in particular without longitudinal splits or cuts occurring, given that the active portions 17 of the thread 15 are devoid of sharp corner edges.
  • the strip 2 of material emerging from the aforementioned stretching and pulling means 7 will present a more homogeneous and fuller bodied structure.
  • the equipment 1 illustrated in figure 8 similar in every respect to that of figure 1, is designed to process two strips 2 of filter material advancing side by side. Where two strips 2 are processed, the drive systems of the respective stretching and pulling rollers might operate either independently of one another or in concert .
  • profiles 16 of the aforementioned helical threads 15 presented by the longitudinal and/or transverse stretching and pulling rollers 11 and 13 will be generated advantageously by a grinding operation, so as to obtain a precision finish.

Abstract

A strip (2) of material used to make filter tips is processed on equipment incorporating one or more pairs of rollers (11, 12, 13, 14) placed along a set path (P) , each composed of a top roller (11, 13) with a helical thread (15) , and an anvil roller (12, 14) , by which the fibres of the strip (2) are stretched and pulled longitudinally and/or transversely; when seen in section, the profile (16) of the helical thread (15) is such that each turn presents a crest portion (17) merged with two flanks (19) by way of smooth and/ or rounded portions (20) , so that when the strip (2) of filter material is engaged by the crest portion (17) , it will not be brought into contact with sharp corner edges.

Description

Description
Equipment for processing at least one strip of filter material in the tobacco industry
Technical Field
The present invention relates to equipment for processing at least one strip of filter material in the tobacco industry.
Background Art
The prior art embraces equipment for processing a strip of filter material fed along a predetermined path and caused, as it advances along the path, to undergo a succession of processing .steps before being directed into a filter making machine.
Generally speaking, these steps will consist in a longitudinal and/or transverse pulling or stretching operation, and a step of treating the strip with additive materials.
The aforementioned pulling or stretching operation is accomplished using pairs of rollers, each composed typically of a threaded roller and an anvil roller.
It has been found that the constituent fibres of the strip can suffer damage and rupture in the course of these longitudinal and/or transverse pulling or stretching operations, with the result that the filtration properties of the finished filters are adversely affected. Disclosure of the Invention
The object of the present invention is to provide equipment for processing at least one strip of filter material, such as will be unaffected by the drawbacks mentioned above . The stated object is duly realized in equipment according to the present invention for processing at least one strip of filter material, in the tobacco industry, as characterized in one or more of the claims appended .
Brief Description of the Drawings
The invention will now be described in detail, by way of example, with the aid of the accompanying drawings, in which: -figure 1 is a schematic front view of equipment for processing a strip of filter material;
-figure 2 shows a detail of figure 1, viewed from the side and partly in section;
-figures 3, 4 and 5 show a detail of figure 2, enlarged and in three different embodiments;
-figure 6 shows a detail of figure 2, enlarged and in a further embodiment;
-figure 7 shows a detail of figure 2, enlarged and under operating conditions; -figure 8 is a schematic plan view of equipment for processing two strips of filter material.
Detailed description of the preferred embodiments of the invention With reference to figure 1, numeral 1 denotes equipment, in its entirety, for processing a strip 2 of filter as used in the tobacco industry, interposed between a feed unit 3 supplying the strip 2 and a filter maker, or filter assembly section, represented schematically as a block denoted 4.
The feed unit 3 , the equipment 1 and the section denoted 4 constitute interoperative parts of a filter maker which, with the exception of the equipment 1 disclosed, is of familiar type and therefore neither illustrated nor described in detail.
Proceeding along the feed direction F followed by the strip 2, the equipment 1 comprises a pair of guide rollers 5 and 6 combining in operation one with another, and next in sequence, along a processing path denoted P, means denoted 7, in their entirety, by which the strip 2 is stretched and pulled longitudinally and/or transversely. Further along, the equipment 1 comprises treatment means 8 by which additives such as a plasticizing compound are applied to the strip 2 of filter material.
Lastly, numerals 9 and 10 denoted two further guide rollers by which the strip 2 is directed toward the filter maker 4.
As illustrated in figure 2, the longitudinal and/or transverse stretching and pulling means 7 include at least one pair of rollers comprising a top roller 11 of which the axis 11a is disposed transversely to the processing path P, and an anvil roller 12 of which the axis 12a lies parallel to the former axis 11a.
The upstream guide rollers 5 and 6, the processing rollers 11 and 12 and the downstream guide rollers 9 and 10 combine to provide means by which the strip 2 is fed along the processing path P.
Also illustrated in figure 1 is a second pair of stretching and pulling rollers comprising a roller 13 of which the axis 13a is disposed transversely to the processing path P, and an anvil roller 14 of which the axis 14a lies parallel to the former axis 13a.
In practice, the equipment 1 might incorporate any number of paired stretching and pulling rollers.
Referring to figures 2, 3 and 4, and in particular to the pair of rollers denoted 11 and 12, the outer cylindrical surface of the top roller 11 presents a helical thread 15, whilst the anvil roller 12 is faced with resilient material.
Viewed on a radial section of the roller 11, as in figures 3 and 4, the helical thread 15 describes a sinuous profile 16, with each turn presenting a crest portion denoted 17, compassed between two roots 18 connected to the crest portion 17 by way of relative flanks 19.
The crest portions 17, which are offered in contact to the strip 2 of filter material and identifiable thus as active portions, appear essentially flat and are merged with the flanks 19 by way of respective smooth or rounded portions 20.
Importantly, the aforementioned portions 20 are incorporated in such a way as to lie substantially tangential to the active portion 17 at all points.
The portions 20 in question will present a preferably constant radius of curvature, although the radius of curvature might also be variable. In the example of figure 3, the ratio between the size of the active portion 17, denoted D, and the pitch p of the helical thread 15, denoted 21, is nominally 0.25 and more broadly might be between 0.22 and 0.28. In the example of figure 4, the ratio between the size D of the active portion 17 and the pitch 21 of the helical thread 15 is nominally 0.5, and more broadly might be between 0.48 and 0.53.
In the example of figure 5, the ratio between the size D of the active portion 17 and the pitch 21 of the helical thread 15 is nominally 0.75, and more broadly might be between 0.72 and 0.78.
In the example of figure 6, the active portions 17 are merged with the flanks 19 by way of smooth or rounded portions 20 and present an arcuate profile.
Likewise in figure 6, the same considerations apply as for the embodiments illustrated in figures 3, 4 and 5, in terms of the ratio between the size D of the active portion 17 and the pitch 21 of the thread. With the equipment 1 in operation, referring in particular to figures 1, 6 and 7, the strip 2 advances in the feed direction F, drawn forward at least by the first stretching and pulling rollers 11 and 12. The advancing strip 2 is subjected by the thread 15 of the top roller 11 to a longitudinal and transverse stretching action.
As discernible from figures 6 and 7, the strip 2 of material passing between the threaded roller 11 and the roller 12 of resilient material will be deformed, but without suffering any damage, and in particular without longitudinal splits or cuts occurring, given that the active portions 17 of the thread 15 are devoid of sharp corner edges.
Accordingly, the strip 2 of material emerging from the aforementioned stretching and pulling means 7 will present a more homogeneous and fuller bodied structure.
This also enables the filter maker 4 to turn out filters with a higher coefficient of filtration, per unit of material utilized.
The equipment 1 illustrated in figure 8, similar in every respect to that of figure 1, is designed to process two strips 2 of filter material advancing side by side. Where two strips 2 are processed, the drive systems of the respective stretching and pulling rollers might operate either independently of one another or in concert .
Importantly, the profiles 16 of the aforementioned helical threads 15 presented by the longitudinal and/or transverse stretching and pulling rollers 11 and 13 will be generated advantageously by a grinding operation, so as to obtain a precision finish.

Claims

Claims
1) Equipment for processing at least one strip of filter material in the tobacco industry, comprising feed means by which the strip (2) is advanced along a processing path (P), means (7) by which the strip (2) is stretched and pulled longitudinally and/or transversely, consisting in at least one pair of rollers placed on opposite sides of the processing path (P) , of which one roller (11) presents a helical thread (15) and the other is an anvil roller (12), also feed means by which the strip is directed toward a filter making section (4) , characterized in that the profile (16) presented by each turn of the helical thread (15), when viewed in section, includes an active portion (17) offered in contact to the strip (2) of filter material and merged with two respective flanks (19) by way of smooth and/or rounded portions (20) , thereby ensuring that the strip (2) is not brought into contact with sharp corner edges during operation of the equipment.
2) Equipment as in claim 1, wherein the active portion (17) of the profile is substantially flat.
3) Equipment as in claim 1, wherein the active portion (17) of the profile is substantially arcuate. 4) Equipment as in claims 1 to 3 , wherein the smooth and/or rounded portions (20) present a constant radius of curvature.
5) Equipment as in claims 1 to 4, wherein the ratio between the size of the active portion (17) and the pitch (21) of the thread (15) is between 0.22 and 0.28.
6) Equipment as in claims 1 to 4, wherein the ratio between the size of the active portion (17) and the pitch (21) of the thread (15) is between 0.47 and 0.53.
7) Equipment as in claims 1 to 4, wherein the ratio between the size of the active portion (17) and the pitch (21) of the thread (15) is between 0.72 and 0.78.
8) Equipment as in claims 1 to 7 , comprising two pairs of stretching and pulling rollers (11, 12; 13, 14) placed along the processing path (P) .
9) Equipment as in claims 1 to 8, comprising feed means by which two strips (2) of filter material are advanced along the processing path (P) .
10) Equipment as in claims 1 to 9 , wherein the profile (16) of the helical thread (15) presented by each of the relative rollers (11; 13) is produced by a grinding operation.
EP06744484.4A 2005-10-07 2006-04-11 Equipment for processing at least one strip of filter material in the tobacco industry Active EP1933653B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000603A ITBO20050603A1 (en) 2005-10-07 2005-10-07 BATH OIL CLUTCH
PCT/IB2006/000832 WO2007042866A1 (en) 2005-10-07 2006-04-11 Equipment for processing at least one strip of filter material in the tobacco industry

Publications (3)

Publication Number Publication Date
EP1933653A1 true EP1933653A1 (en) 2008-06-25
EP1933653B1 EP1933653B1 (en) 2010-03-31
EP1933653B2 EP1933653B2 (en) 2016-04-13

Family

ID=36636233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06744484.4A Active EP1933653B2 (en) 2005-10-07 2006-04-11 Equipment for processing at least one strip of filter material in the tobacco industry

Country Status (7)

Country Link
EP (1) EP1933653B2 (en)
JP (1) JP2009511009A (en)
CN (1) CN101282659A (en)
AT (1) ATE462314T1 (en)
DE (1) DE602006013334D1 (en)
IT (1) ITBO20050603A1 (en)
WO (1) WO2007042866A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101926510B (en) * 2009-06-23 2012-06-13 湖北中烟工业有限责任公司 Production method of filter rod with tai chi appearance and equipment thereof
KR102467573B1 (en) * 2014-11-03 2022-11-17 필립모리스 프로덕츠 에스.에이. Method and apparatus for manufacturing a crimped web
CN105852205A (en) * 2016-04-28 2016-08-17 宜兴市新建烟机配件有限公司 Polyurethane rubber roller applied to opener for cigarette filter tip

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB866803A (en) * 1957-01-31 1961-05-03 Gustav Schickedanz Method of making filter tips for cigarettes
CH383239A (en) * 1959-09-22 1964-10-15 Mueller Paul A Filter stoppers for cigarettes and methods of making the same
NL274991A (en) * 1961-02-21
US3317965A (en) * 1964-09-11 1967-05-09 Osaka Kiko Kabushiki Kaisha Tow filament separating apparatus
US4003684A (en) * 1971-05-13 1977-01-18 Celfil Company Establishment Apparatus for treating webs of filtering material for tobacco product filters, particularly cigarette filters
FR2418628A1 (en) * 1978-03-03 1979-09-28 Job Ets Bardou Job Pauilhac Embossing fibrous sheet for making cigarette filter tips - produces wide range of sheet textures, by adjusting continuous machine
US5733234A (en) * 1993-07-14 1998-03-31 Rhone-Poulenc Rhodia Aktiengesellschaft Method and apparatus for producing fiber skeins
JP3823576B2 (en) * 1998-12-10 2006-09-20 東レ株式会社 Contact roll
JP2003212409A (en) * 2002-01-28 2003-07-30 Toray Ind Inc Manufacturing method and manufacturing apparatus of sheet roll body
DE10227378B4 (en) * 2002-06-20 2008-07-17 International Tobacco Machinery B.V. Roller pair for tensioning strands of filter material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007042866A1 *

Also Published As

Publication number Publication date
EP1933653B2 (en) 2016-04-13
DE602006013334D1 (en) 2010-05-12
EP1933653B1 (en) 2010-03-31
WO2007042866A1 (en) 2007-04-19
ATE462314T1 (en) 2010-04-15
ITBO20050603A1 (en) 2007-04-08
JP2009511009A (en) 2009-03-19
CN101282659A (en) 2008-10-08

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