CA1092902A - Method and apparatus for bronzing cigarette paper - Google Patents
Method and apparatus for bronzing cigarette paperInfo
- Publication number
- CA1092902A CA1092902A CA282,321A CA282321A CA1092902A CA 1092902 A CA1092902 A CA 1092902A CA 282321 A CA282321 A CA 282321A CA 1092902 A CA1092902 A CA 1092902A
- Authority
- CA
- Canada
- Prior art keywords
- particles
- finely
- air
- application
- divided particles
- 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.)
- Expired
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The bronzing of cigarette paper is achieved by impinging finely-divided particles, usually finely-divided metal particles, suspended in an air stream against the surface desired to be bronzed and bearing an outline in wet adhesive of the desired pattern. Some of the metal particles adhere to the adhesive to provide the desired bronzing. The finely-divided particles are conveyed to the application unit in an air stream and excess particles are conveyed away from the application unit in an air stream the air conveyances to and from the application unit being achieved using flowing air streams formed by a centrifugal fan which also communicates with a cyclone separator.
The bronzing of cigarette paper is achieved by impinging finely-divided particles, usually finely-divided metal particles, suspended in an air stream against the surface desired to be bronzed and bearing an outline in wet adhesive of the desired pattern. Some of the metal particles adhere to the adhesive to provide the desired bronzing. The finely-divided particles are conveyed to the application unit in an air stream and excess particles are conveyed away from the application unit in an air stream the air conveyances to and from the application unit being achieved using flowing air streams formed by a centrifugal fan which also communicates with a cyclone separator.
Description
~o9z9~
The present invention relates to modified bronz-ing methods and apparatus.
In copending Canadian application Serial No.
282,322 filed concurrently herewith by Warren A, Brackmann and assigned to the assignee of this application, there is described a bronzing procedure for cigarette paper wherein bronzing is acheived by impinging finely-divided metal particles suspended in an air stream against the surface desired to be bronzed in an appl~cation zone or unit. The surface bears an outline in wet adhesive of the desired pattern and metal particles adhere to the adhesive.
The metal particles are conveyed to the application zone in an air stream and excess metal particles are conveyed away from the application zone in an air stream~ The metal ; particles may be replaced by other finely-divided particles.
:
In the prior art application, separate compressed air feeds are specifically described as being provided for ~; conveying the particles to and from the application unit.
In accordance with one embodiment of this ir.vention, a single motlve force producing means, preferably a centri-fugal fan, is provided for achieving the conveying of the .
particles to and from the application unit in a substantially closed loop in flowing air streams formed by the action of the fan.
~,
The present invention relates to modified bronz-ing methods and apparatus.
In copending Canadian application Serial No.
282,322 filed concurrently herewith by Warren A, Brackmann and assigned to the assignee of this application, there is described a bronzing procedure for cigarette paper wherein bronzing is acheived by impinging finely-divided metal particles suspended in an air stream against the surface desired to be bronzed in an appl~cation zone or unit. The surface bears an outline in wet adhesive of the desired pattern and metal particles adhere to the adhesive.
The metal particles are conveyed to the application zone in an air stream and excess metal particles are conveyed away from the application zone in an air stream~ The metal ; particles may be replaced by other finely-divided particles.
:
In the prior art application, separate compressed air feeds are specifically described as being provided for ~; conveying the particles to and from the application unit.
In accordance with one embodiment of this ir.vention, a single motlve force producing means, preferably a centri-fugal fan, is provided for achieving the conveying of the .
particles to and from the application unit in a substantially closed loop in flowing air streams formed by the action of the fan.
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~0~291~)2 The invention is described further, by way of illus-tration with reference to the accompanying drawings, in which:
Figure 1 is a schematic representation of a cigarette paper bronzing system provided in accordance with one embodiment of the invention; and Figure 2 is a sectional view of an application unit for use in the bronzing system of Figuxe 1 or in the aforementioned copending application.
Referring to Figure 1 of the drawings, there is shown a bronzinn system for a continuous cigarette paper band 10 which includes a bronzing application unit 12. The bronzing application unit has a generally enclosed box-like struc-ture with inlet and outlet slits 14 and 16 formed in the side walls adjacent the upper closure to permit the paper band 10 to pass through the application unit 12 in a generally horizontal flow path.
~; A discharge pipe 18 is positioned in the appli-~: : cation unit 12 with the discharge orifice adjacent the paper band 10 and is arranged at an acute angle to the paper band 10 opposite to the direction of intended movement of the paper band 10.
: A metal particles collecting member 24 is posi- :
~: tioned in the application unit l2 having downwardly-sloping walls which communicate with a metal particles exit pipe ~;~ 26.
A feed pipe line 42 is provided communicating with the discharge pipe 18 for conveying an air-borne stream of : metal particles to the application unit 12. A discharge or return pipe line 52 is connected to the exit pipe 26 of the application unit 12 for conveying an air-borne stream of excess metal particles away from the application unit 12.
:
~ rs D
- .. . ~.. . ... . .. .
~0~291~)2 The invention is described further, by way of illus-tration with reference to the accompanying drawings, in which:
Figure 1 is a schematic representation of a cigarette paper bronzing system provided in accordance with one embodiment of the invention; and Figure 2 is a sectional view of an application unit for use in the bronzing system of Figuxe 1 or in the aforementioned copending application.
Referring to Figure 1 of the drawings, there is shown a bronzinn system for a continuous cigarette paper band 10 which includes a bronzing application unit 12. The bronzing application unit has a generally enclosed box-like struc-ture with inlet and outlet slits 14 and 16 formed in the side walls adjacent the upper closure to permit the paper band 10 to pass through the application unit 12 in a generally horizontal flow path.
~; A discharge pipe 18 is positioned in the appli-~: : cation unit 12 with the discharge orifice adjacent the paper band 10 and is arranged at an acute angle to the paper band 10 opposite to the direction of intended movement of the paper band 10.
: A metal particles collecting member 24 is posi- :
~: tioned in the application unit l2 having downwardly-sloping walls which communicate with a metal particles exit pipe ~;~ 26.
A feed pipe line 42 is provided communicating with the discharge pipe 18 for conveying an air-borne stream of : metal particles to the application unit 12. A discharge or return pipe line 52 is connected to the exit pipe 26 of the application unit 12 for conveying an air-borne stream of excess metal particles away from the application unit 12.
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Air flow through the lines 42 and 52 is achieved using a centrifugal fan 60, or other single motive force inducing means, the inlet side of which communicates wi-th the return line 52.
The downstream side of the centrifigal an 60 communicates with the inlet of a cyclone separa-tor 62 or other air/solid separator. The heavy fraction discharge pipe 64 of the cyclone separator 62 communicates directly with the feed line 42.
The fan 60, therefore, provides a virtually closed air flow system which imparts motive force for the cyclic flow of metal particles suspended in air streams in lines 42 and 52.
The light fraction discharge pipe 66 of the cyclone separator 62 is provided with a valve 68 to control air flow out of the separator. In this way, any small leaks of air into the bronzing application unit 12 around the entrance and exit slits 14 and 16 are compensated for by the controlled discharge of an equivalent quantity of air through the valved pipe 68 so that the overall pressure balance in the system is substantially uniform. Preferably, the discharge through the valved pipe 68 is controlled to provide a positive inflow of air around the entrance and exit slits 14 and 16, so that outflow o~ air and particles cannot occur at these points.
The controlled discharge of air from the system through the valve 68 also allows for any lint removal which may be necessary.
,:
~ As the paper band lO passes through the application ; 30 unit 12, after printing on the side thereof intended to face ` ' :
. . . :: , l(l~Z902 the discharge pi7e 18 of the ou-tline of the bronzing pattern desired with brown ink or other acLhesive ink in conventional manner in a printing zone, not shown, a spray o. fine metallic particles is impinged uncler the force of the circulating air induced by the fan 60 onto khe band surface from the discharge pipe 18 to cause metal particles to adhere to the wet ink areas and provide the bronzed pattern appearance desired.
Metal particles which do not adhere to the wet ink or otherwise do not remai.n in contact with the surface of the paper band 10 fall under the influence of gravity into the collec~or 24. Any loose non-adhered particles remaining in contact with the paper band 10 may be removed, if required, by a separate air jet applied from a second discharge pipe arranged downstream of the pipe 18.
The excess metal particles leaving the application unit 12 through e`xit pipe 26 are air conveyed through line 52 under the suction force of the upstream side of the fan 60. The air-borne stream of metal particles which passes ~0 out of the heavy fraction discharge pipe 64 of the cyclone separator 62 is conveyed under the influence of the fan 60 to the application unit 12 by line 42. The metal particles which ;~
impinge on the surface of the paper 10, therefore, are fed as ~ -a suspension in an air stream flowing under the compressive force of the fan 60.
:: ~
The quantity of metal particles circulating in the system may be sensed in any convenient manner and make up quantities of particles may be fed to the system on an intermittent or continuous basis, as required.
The feed of metal partirles to the system may be achieved in any convenient manner, such as, by use of the procedure described in the aforementioned copending appli-cation.
.. ., ~
AS il~ustrated therein, the feed of metal particles occurs from a source unit comprising a storaye container holding a bulk mass of the metal particles and a metering device for removing the desired quantity of the metal particles from the bulk mass. The metering device includes a screw conveyor feeder driven by a suitable motor and con-nected to the storage container and extending generally horizontally from the bulk mass externally of the container and into operative relationship with the flowing air streams.
The introduction of feed material to the system may occur at any convenient location, for example, by line 70 into the recycle line 52.
The bronzing application unit 12 may be positioned at a location remote from the remaining portions of the - apparatus, including the metal particle source ~eed 70, achieving flexibility in relative locations.
A sensing device may be provided with the particle flow system to sense the further quantities of particles required to make up for that consumed from the cycling 20 : material in the bronzing operation and activate the metering of the required amount of particles into the cyclic flow system, on a continuous or intermittent basis, by line 70.
The system provided in accordance with this inven-:: ~. tion, therefore, possesses all the attributes of the system described in the aforementioned pending application and the advantages thereof over the prior art, and has an . additional advantage in xequiring only a single motive force producing means to achieve the air conveyance of the metal.
particles in the system~
Turning now to Figure 2 o~ the drawings, there is illustrated an alternative bronzing application unit 12 -2~Q2 which may be used in place of that illustrated above in connection with Figure 1. The alternative application unit 12 also may be used in the system described in the afore-mentioned copending application and also in the system described in copending Canadian application Serial No.~2,~
filed concurrently herewith in the names of Warren A.
Brackmann and Erich J. Kirchner and assigned to the assignee of this application.
The bronzing application unit of Figure 2 which operates in analogous manner to the unit 12 described above in connection with Figure 1 has guide wheels 82, 84, 86 and 88 defining a flow path for the paper band 10 through the -unit 12 which is first vertically-downwardly from the entrance slit 14 and then vertically-upwardly to the exit slit 16.
The first discharge pipe 18 is located adjacent the paper band 10 in its downward flow path and the second discharge pipe 20, if used, is positioned vertically below the first discharge pipe 18.
While th~ application of the metallic particles -~
is shown as occurring during the vertlcally-downward movement of the paper band 10 through the unit 12, it is also possible to position the discharge pipes 18 and 20 adjacent the paper band during its vertically-upward move-ment. ~ -The present invention, therefore, provides a .
bronzing operation which efficiently achieves bronzing usingan air-assisted spray application of bronzing metal particles to the desired pattern in a closed loop system.
Modifications are possible within the scope of the invention.
~ '
:.
: ~X, ;Z90Z
Air flow through the lines 42 and 52 is achieved using a centrifugal fan 60, or other single motive force inducing means, the inlet side of which communicates wi-th the return line 52.
The downstream side of the centrifigal an 60 communicates with the inlet of a cyclone separa-tor 62 or other air/solid separator. The heavy fraction discharge pipe 64 of the cyclone separator 62 communicates directly with the feed line 42.
The fan 60, therefore, provides a virtually closed air flow system which imparts motive force for the cyclic flow of metal particles suspended in air streams in lines 42 and 52.
The light fraction discharge pipe 66 of the cyclone separator 62 is provided with a valve 68 to control air flow out of the separator. In this way, any small leaks of air into the bronzing application unit 12 around the entrance and exit slits 14 and 16 are compensated for by the controlled discharge of an equivalent quantity of air through the valved pipe 68 so that the overall pressure balance in the system is substantially uniform. Preferably, the discharge through the valved pipe 68 is controlled to provide a positive inflow of air around the entrance and exit slits 14 and 16, so that outflow o~ air and particles cannot occur at these points.
The controlled discharge of air from the system through the valve 68 also allows for any lint removal which may be necessary.
,:
~ As the paper band lO passes through the application ; 30 unit 12, after printing on the side thereof intended to face ` ' :
. . . :: , l(l~Z902 the discharge pi7e 18 of the ou-tline of the bronzing pattern desired with brown ink or other acLhesive ink in conventional manner in a printing zone, not shown, a spray o. fine metallic particles is impinged uncler the force of the circulating air induced by the fan 60 onto khe band surface from the discharge pipe 18 to cause metal particles to adhere to the wet ink areas and provide the bronzed pattern appearance desired.
Metal particles which do not adhere to the wet ink or otherwise do not remai.n in contact with the surface of the paper band 10 fall under the influence of gravity into the collec~or 24. Any loose non-adhered particles remaining in contact with the paper band 10 may be removed, if required, by a separate air jet applied from a second discharge pipe arranged downstream of the pipe 18.
The excess metal particles leaving the application unit 12 through e`xit pipe 26 are air conveyed through line 52 under the suction force of the upstream side of the fan 60. The air-borne stream of metal particles which passes ~0 out of the heavy fraction discharge pipe 64 of the cyclone separator 62 is conveyed under the influence of the fan 60 to the application unit 12 by line 42. The metal particles which ;~
impinge on the surface of the paper 10, therefore, are fed as ~ -a suspension in an air stream flowing under the compressive force of the fan 60.
:: ~
The quantity of metal particles circulating in the system may be sensed in any convenient manner and make up quantities of particles may be fed to the system on an intermittent or continuous basis, as required.
The feed of metal partirles to the system may be achieved in any convenient manner, such as, by use of the procedure described in the aforementioned copending appli-cation.
.. ., ~
AS il~ustrated therein, the feed of metal particles occurs from a source unit comprising a storaye container holding a bulk mass of the metal particles and a metering device for removing the desired quantity of the metal particles from the bulk mass. The metering device includes a screw conveyor feeder driven by a suitable motor and con-nected to the storage container and extending generally horizontally from the bulk mass externally of the container and into operative relationship with the flowing air streams.
The introduction of feed material to the system may occur at any convenient location, for example, by line 70 into the recycle line 52.
The bronzing application unit 12 may be positioned at a location remote from the remaining portions of the - apparatus, including the metal particle source ~eed 70, achieving flexibility in relative locations.
A sensing device may be provided with the particle flow system to sense the further quantities of particles required to make up for that consumed from the cycling 20 : material in the bronzing operation and activate the metering of the required amount of particles into the cyclic flow system, on a continuous or intermittent basis, by line 70.
The system provided in accordance with this inven-:: ~. tion, therefore, possesses all the attributes of the system described in the aforementioned pending application and the advantages thereof over the prior art, and has an . additional advantage in xequiring only a single motive force producing means to achieve the air conveyance of the metal.
particles in the system~
Turning now to Figure 2 o~ the drawings, there is illustrated an alternative bronzing application unit 12 -2~Q2 which may be used in place of that illustrated above in connection with Figure 1. The alternative application unit 12 also may be used in the system described in the afore-mentioned copending application and also in the system described in copending Canadian application Serial No.~2,~
filed concurrently herewith in the names of Warren A.
Brackmann and Erich J. Kirchner and assigned to the assignee of this application.
The bronzing application unit of Figure 2 which operates in analogous manner to the unit 12 described above in connection with Figure 1 has guide wheels 82, 84, 86 and 88 defining a flow path for the paper band 10 through the -unit 12 which is first vertically-downwardly from the entrance slit 14 and then vertically-upwardly to the exit slit 16.
The first discharge pipe 18 is located adjacent the paper band 10 in its downward flow path and the second discharge pipe 20, if used, is positioned vertically below the first discharge pipe 18.
While th~ application of the metallic particles -~
is shown as occurring during the vertlcally-downward movement of the paper band 10 through the unit 12, it is also possible to position the discharge pipes 18 and 20 adjacent the paper band during its vertically-upward move-ment. ~ -The present invention, therefore, provides a .
bronzing operation which efficiently achieves bronzing usingan air-assisted spray application of bronzing metal particles to the desired pattern in a closed loop system.
Modifications are possible within the scope of the invention.
~ '
Claims (8)
1. In a method for the application of finely-divided particles to an elongate paper band bearing on one face thereof repeated outlines at longitudinally-spaced locations and having adhesive for said particles applied to said outlines, which comprises air conveying finely-divided particles to an application zone; impinging said air-conveyed particles against said one face of said paper band in said application zone while said paper band is in continuous longitudinal motion through said application zone to adhere particles to successive ones of said adhesive outlines and thereby provide successive outlines in said particles on said band as it emerges from said application zone; collecting excess particles not adhered to said out-lines in said spray application in said application zone, and air conveying said collected particles away from said appli-cation zone, the procedure wherein said particles are air conveyed to said application zone and air conveyed from said application zone in a substantially closed loop by flowing air streams formed by a single air movement inducing means.
2. The method of claim 1 wherein said flowing air streams are located in a substantially closed loop which includes said single air movement inducing means.
3. The method of claim 2 including removing from said closed loop a volume of air corresponding substantially to a volume of air entering said substantially closed loop during said method.
4. The method of claim 1 wherein said finely-divided particles are finely-divided metal particles.
5. In an apparatus for the application of finely-divided particles to an elongate paper band bearing on one face thereof repeated pattern outlines at longitudinally-spaced locations and having adhesive for said finely-divided particles applied to said outlines, comprising a finely-divided particles application unit having inlet means for an air-borne stream of finely-divided particles, outlet means for excess finely-divided particles and paper band path defining means for defining the path through said application unit of said elongate paper band, which path intersects the passage of said finely-divided particles through said applica-tion unit for the application of said particles to said out-lines and adheres particles to successive ones of said adhesive outlines and thereby provide successive outlines in said particles on said band; a finely-divided particles source unit for forming an air-borne stream of finely-divided particles; first conduit means for conveying said air-borne stream of finely-divided particles from said source unit to the inlet means of said application unit; means for forming an air-borne stream from said excess finely-divided particles and second conduit means for conveying said air-borne stream of excess particles from said outlet means of said application unit to said source unit; the apparatus wherein said source unit includes centrifugal fan means and cyclone separator means, said second conduit means is connected to the inlet side of said centrifugal fan means, the outlet side of said centrifugal fan means is connected to the inlet side of said cyclone separator means, the heavy fraction outlet of said cyclone separator means is connected to said first conduit means, and light fraction outlet of said cyclone separator means is valved to control the discharge of air therefrom, whereby air is circulated by said fan means in a substantially closed loop to and from said application unit through said first and second conduit means respectively.
6. The apparatus of claim 5, wherein said source unit further comprises metering means for feeding finely-divided particles from a mass of said particles into said second conduit means to provide the required quantity of said particles in said first conduit means.
7. In an apparatus for the application of finely-divided particles to an elongate paper band bearing on one face thereof repeated pattern outlines at longitudinally-spaced locations and having adhesive for said finely-divided particles applied to said outlines, comprising a finely-divided particles application unit having inlet means for an air-borne stream of finely-divided particles, outlet means for excess finely-divided particles and paper band path defining means for defining the path through said application unit of said elongate paper band, which path intersects the passage of said finely-divided particles through said application unit for the application of said particles to said outlines and adhere particles to successive ones of said adhesive outlines and thereby provide successive outlines in said particles on said band; means for forming an air-borne stream of finely-divided particles; means for conveying said air-borne stream of finely-divided particles to said application unit; means for forming an air-borne stream from said excess finely-divided particles; and means for conveying said air-borne stream of excess metal particles away from said application unit; the structure of said application unit wherein said paper band path defining means comprises first and second vertically-spaced pairs of guide rollers located in horizontally spaced locations with one of each pair of rollers inside the unit and the other of each pair located outside the unit and defines a paper band flow path extending vertically downwardly between the first pair of rollers, horizontally between the one member of each pair of rollers and vertically upwardly between the second pair of rollers, said inlet means is located adjacent one of the vertical paths of the paper band and said outlet means is located at the base of the unit.
8. The apparatus of claim 7, including a compressed air inlet located adjacent said inlet means in downstream relation thereto with respect to said paper band flow path.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4885676 | 1976-11-23 | ||
| GB48856/76 | 1976-11-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092902A true CA1092902A (en) | 1981-01-06 |
Family
ID=10450177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA282,321A Expired CA1092902A (en) | 1976-11-23 | 1977-07-08 | Method and apparatus for bronzing cigarette paper |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1092902A (en) |
-
1977
- 1977-07-08 CA CA282,321A patent/CA1092902A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |