CA1049342A - Simultaneous, continuous coating of both surfaces of long sheet material - Google Patents
Simultaneous, continuous coating of both surfaces of long sheet materialInfo
- Publication number
- CA1049342A CA1049342A CA228,724A CA228724A CA1049342A CA 1049342 A CA1049342 A CA 1049342A CA 228724 A CA228724 A CA 228724A CA 1049342 A CA1049342 A CA 1049342A
- Authority
- CA
- Canada
- Prior art keywords
- sheet material
- coating
- sheet
- coating liquid
- films
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/18—Processes for applying liquids or other fluent materials performed by dipping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
- B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
- B05C3/125—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length the work being a web, band, strip or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
- B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
Abstract
ABSTRACT OF THE DISCLOSURE
A long sheet material is passed continuously through a slit inlet formed in a wall of a vessel containing a coating liquid (e.g., paint), through the paint, out of the vessel through a slit outlet formed in an oppo-site wall at a level below the surface of the paint, and between means for regulating the thicknesses of the coating paint films thus applied simultane-ouly ant continuously to the two sides of the sheet material to specific values. The sheet thus coated is then caused to travel through a long un-supported span thereof in which the coating paint films are set by drying or baking.
A long sheet material is passed continuously through a slit inlet formed in a wall of a vessel containing a coating liquid (e.g., paint), through the paint, out of the vessel through a slit outlet formed in an oppo-site wall at a level below the surface of the paint, and between means for regulating the thicknesses of the coating paint films thus applied simultane-ouly ant continuously to the two sides of the sheet material to specific values. The sheet thus coated is then caused to travel through a long un-supported span thereof in which the coating paint films are set by drying or baking.
Description
~04934Z
This invention relates generally to coating of surfaces of articles with coating materials. More particularly, the invention relates to a process and apparatus for simultaneous and continuous coating of both surfaces of a long sheet mate-rial, which process comprises causing a coating material (e.g., a paint) to adhere simultaneously to the two surfaces of a long sheet material of metal or a synthetic resin or a metal foil (hereinafter referred to as a "sheet"), adjusting the coating film thicknesses on the two surfaces to specific thicknesses, and causing the sheet to travel in its longitu-dinal direction as a span thereof is supported on supports, in which span the coating films are caused to set.
Heretofore, the common procedure for coating the two surfaces of a sheet with a coating material has been to first apply the coating material on one of the surfaces and set the same and then to apply the coating material on the other surface and set the same. This conventional procedure is inefficient.
In accordance with this invention in one aspect thereof, briefly summarized, there is provided a process for . coating a long sheet material which comprises passing the sheet material continuously through a body of a coating liquid thereby to cause the coating liquid to adhere to and form coating films simultaneously on the two surfaces of the sheet, regulating the thicknesses of the coating films at specific values by allowing passage of said sheet through a means provided with one or more helical grooves or with one or more helically wrapped steel wires, all of which make an oblique angle with the travelling direction of the sheet, causing the sheet thus coated to travel in its longitudinal and horizontal direction as it is supported in a manner providing an unsupported span thereof over a specific length, and !A
setting the coating films on the sheet in this span.
According to this invention in another aspect thereof, there is provided an apparatus for carrying out the process of the invention, the apparatus comprising: a vessel contain-ing a coating liquid with a constantly maintained liquid surface level and having opposed upstream and downstream end walls provided therethrough respectively with an inlet and an outlet both of horizontal slit shape disposed at a height level below the liquid surface level; means for causing the long sheet material to travel in a longitudinal direction longitu-dinally and continuously through the coating liquid, entering the vessel through the $nlet and exiting through the outlet, thereby to coat simultaneously and continuously the two surfaces of the sheet material with respective films of the coating liquid; means for regulating the thicknesses of the coating liquid films on the sheet material exiting from the vessel at specific values, said means being provided there-around with one or more helical grooves or with one or more helically wrapped steel wires, all of which grooves and wires , 20 making an oblique angle with the travelling direction of the :' sheet; and means for supporting the sheet material thus coated in a manner to provide an unsupported span thereof of a length sufficient for setting of the coating liquid films thereon.
The nature, utility, and further features of the invention will be apparent from the following detailed description when read in conjunction with the accompanying drawing.
. In the drawing, the single figure is a side elevation, in vertical section, showing one example of apparatus suitable for practice of the process of this invention.
In the example illustrated in the drawing of apparatus, ~ 2 ,~ _ _ . . . ~ .
10~934Z
there is provided a coating vessel 2 containing a coating liquid (e.g., paint) I and having a horizontal inlet 5 of slit shape in its upstream end wall 3 and a horizontal outlet 6 of slit shape in its downstream end wall 4. A pair of adjustment plates 7 capable of moving in the up-and-down directions are provided at the outer wall surface of the end wall 4 at the outlet 6.
Jackets or troughs 8 and 9 for recovery of coating liquid are provided respectively at the lower outer sides of the end walls 3 and 4 of the coating vessel 2, whereby any coating liquid flowing or dropping into these jackets 8 and 9 is recirculated into the coating vessel 2. Furthermore, coating liquid is appropriately replenished thereby to main-tain the surface of the coating liquid 1 in the coating vessel
This invention relates generally to coating of surfaces of articles with coating materials. More particularly, the invention relates to a process and apparatus for simultaneous and continuous coating of both surfaces of a long sheet mate-rial, which process comprises causing a coating material (e.g., a paint) to adhere simultaneously to the two surfaces of a long sheet material of metal or a synthetic resin or a metal foil (hereinafter referred to as a "sheet"), adjusting the coating film thicknesses on the two surfaces to specific thicknesses, and causing the sheet to travel in its longitu-dinal direction as a span thereof is supported on supports, in which span the coating films are caused to set.
Heretofore, the common procedure for coating the two surfaces of a sheet with a coating material has been to first apply the coating material on one of the surfaces and set the same and then to apply the coating material on the other surface and set the same. This conventional procedure is inefficient.
In accordance with this invention in one aspect thereof, briefly summarized, there is provided a process for . coating a long sheet material which comprises passing the sheet material continuously through a body of a coating liquid thereby to cause the coating liquid to adhere to and form coating films simultaneously on the two surfaces of the sheet, regulating the thicknesses of the coating films at specific values by allowing passage of said sheet through a means provided with one or more helical grooves or with one or more helically wrapped steel wires, all of which make an oblique angle with the travelling direction of the sheet, causing the sheet thus coated to travel in its longitudinal and horizontal direction as it is supported in a manner providing an unsupported span thereof over a specific length, and !A
setting the coating films on the sheet in this span.
According to this invention in another aspect thereof, there is provided an apparatus for carrying out the process of the invention, the apparatus comprising: a vessel contain-ing a coating liquid with a constantly maintained liquid surface level and having opposed upstream and downstream end walls provided therethrough respectively with an inlet and an outlet both of horizontal slit shape disposed at a height level below the liquid surface level; means for causing the long sheet material to travel in a longitudinal direction longitu-dinally and continuously through the coating liquid, entering the vessel through the $nlet and exiting through the outlet, thereby to coat simultaneously and continuously the two surfaces of the sheet material with respective films of the coating liquid; means for regulating the thicknesses of the coating liquid films on the sheet material exiting from the vessel at specific values, said means being provided there-around with one or more helical grooves or with one or more helically wrapped steel wires, all of which grooves and wires , 20 making an oblique angle with the travelling direction of the :' sheet; and means for supporting the sheet material thus coated in a manner to provide an unsupported span thereof of a length sufficient for setting of the coating liquid films thereon.
The nature, utility, and further features of the invention will be apparent from the following detailed description when read in conjunction with the accompanying drawing.
. In the drawing, the single figure is a side elevation, in vertical section, showing one example of apparatus suitable for practice of the process of this invention.
In the example illustrated in the drawing of apparatus, ~ 2 ,~ _ _ . . . ~ .
10~934Z
there is provided a coating vessel 2 containing a coating liquid (e.g., paint) I and having a horizontal inlet 5 of slit shape in its upstream end wall 3 and a horizontal outlet 6 of slit shape in its downstream end wall 4. A pair of adjustment plates 7 capable of moving in the up-and-down directions are provided at the outer wall surface of the end wall 4 at the outlet 6.
Jackets or troughs 8 and 9 for recovery of coating liquid are provided respectively at the lower outer sides of the end walls 3 and 4 of the coating vessel 2, whereby any coating liquid flowing or dropping into these jackets 8 and 9 is recirculated into the coating vessel 2. Furthermore, coating liquid is appropriately replenished thereby to main-tain the surface of the coating liquid 1 in the coating vessel
2 at a constant level.
In the jacket 8, there are provided a pair of rolls 11, the upper roll of which is contacted by a reverse-rotation roll 10, while in the jacket 9, there are provided a pair of regulating rolls 12 capable of being moved in the up-and-down directions. Each of the regulating rolls 12 is provided therearound with one or more helical grooves (not shown) or with - 2a -~, .. .
104934;~
one or more helically wrapped steel wires (not shown), whereby the rolls 12 function as means for regulating the thicknesses of the coating films at specific values. The axes of rotation of the rolls 11 lie in a substant-ially vertical plane, and the midpoint of the gap between these rolls is substantially at the same height level as the inlet 5. The axes of rotation of the regulating rolls 12 also lie in a substantially vertical plane, and the midpoint of the gap therebetween is substantially at the same height level as the outlet 6.
When a continuous sheet 13 is to be coated with the coating liquid, the sheet 13 is passed between a pair of back tension rolls 14 and the rolls 11, introduced through the inlet 5 into the coating vessel 2, led out through the outlet 6, and passed between the adjusting plates 7 and the regulating rolls 12. By suitably adjusting the slit gap between the adjusting plates ; 7, the coating liquid can be caused to assume an appropriate flow rate an the surfaces of the sheet 13. Furthermore, by suitably adjusting the squeez-ing pressure of the regulating rolls 12 on the sheet 13 and suitably select-ing the shape of the helical groove or grooves or the thickness of the steel wire or wires on these rolls, a desired thickness of the coating liquid can be caused to be deposited on the two surfaces of the sheet or foil.
Thereafter, the sheet or foil 13 is supported on a roller 15 installed downstream from the regulating rolls 12 at a distance therefrom which is sufficient for the coating liquid adhering to the sheet 13 in the span therebetween to set, whereby the sheet 13 is caused to travel between the regulating rolls 12 and the roller 15 without any object contacting the coating liquid adhering thereto. During its travel through the span between the regulating rolls 12 and the roller 15, the coating liquid on the sheet is dried or baked, and then the sheet 13 is taken up on a recoiler (not shown).
In one example of practice of this invention, aluminum sheets (a basic sheet, a sheet with anodic oxidation film formed on the surfaces there-of by an ordinary method, and a sheet which had been subjected to coloring treatment) were passed at a traveling speed of 3 to 4 meters/minute through a coating vessel containing a transparent, water-soluble, acrylic resin paint.
This coating vessel constituted the principal component of an apparatus as illustrated in the drawing, in which the distance between the rolls 12 and the support roller 15 was 40 meters. In this span, the sheet thus coated with a paint film of a thickness of approximately 20 microns on its upper surface and a paint film of a thickness of approximately 5 microns on its lower surface was passed through a furnace of 30-meter length at~l210C there-by to bake and set the paint. As a result, excellent coating films were obtained on the aluminum sheets.
By the practice of this invention, a coating liquid can be caused to adhere with desired thicknesses simultaneously on the two surfaces of a sheet and be set by drying or baking. For this reason, the process accord-ing to this invention is extremely efficient, requiring a process time which is approximately one half of that of the conventional process which comprises applying the paint on one surface of the sheet, setting it by drying or baking, then applying the paint on the other surface, and setting the same by drying or baking.
In the jacket 8, there are provided a pair of rolls 11, the upper roll of which is contacted by a reverse-rotation roll 10, while in the jacket 9, there are provided a pair of regulating rolls 12 capable of being moved in the up-and-down directions. Each of the regulating rolls 12 is provided therearound with one or more helical grooves (not shown) or with - 2a -~, .. .
104934;~
one or more helically wrapped steel wires (not shown), whereby the rolls 12 function as means for regulating the thicknesses of the coating films at specific values. The axes of rotation of the rolls 11 lie in a substant-ially vertical plane, and the midpoint of the gap between these rolls is substantially at the same height level as the inlet 5. The axes of rotation of the regulating rolls 12 also lie in a substantially vertical plane, and the midpoint of the gap therebetween is substantially at the same height level as the outlet 6.
When a continuous sheet 13 is to be coated with the coating liquid, the sheet 13 is passed between a pair of back tension rolls 14 and the rolls 11, introduced through the inlet 5 into the coating vessel 2, led out through the outlet 6, and passed between the adjusting plates 7 and the regulating rolls 12. By suitably adjusting the slit gap between the adjusting plates ; 7, the coating liquid can be caused to assume an appropriate flow rate an the surfaces of the sheet 13. Furthermore, by suitably adjusting the squeez-ing pressure of the regulating rolls 12 on the sheet 13 and suitably select-ing the shape of the helical groove or grooves or the thickness of the steel wire or wires on these rolls, a desired thickness of the coating liquid can be caused to be deposited on the two surfaces of the sheet or foil.
Thereafter, the sheet or foil 13 is supported on a roller 15 installed downstream from the regulating rolls 12 at a distance therefrom which is sufficient for the coating liquid adhering to the sheet 13 in the span therebetween to set, whereby the sheet 13 is caused to travel between the regulating rolls 12 and the roller 15 without any object contacting the coating liquid adhering thereto. During its travel through the span between the regulating rolls 12 and the roller 15, the coating liquid on the sheet is dried or baked, and then the sheet 13 is taken up on a recoiler (not shown).
In one example of practice of this invention, aluminum sheets (a basic sheet, a sheet with anodic oxidation film formed on the surfaces there-of by an ordinary method, and a sheet which had been subjected to coloring treatment) were passed at a traveling speed of 3 to 4 meters/minute through a coating vessel containing a transparent, water-soluble, acrylic resin paint.
This coating vessel constituted the principal component of an apparatus as illustrated in the drawing, in which the distance between the rolls 12 and the support roller 15 was 40 meters. In this span, the sheet thus coated with a paint film of a thickness of approximately 20 microns on its upper surface and a paint film of a thickness of approximately 5 microns on its lower surface was passed through a furnace of 30-meter length at~l210C there-by to bake and set the paint. As a result, excellent coating films were obtained on the aluminum sheets.
By the practice of this invention, a coating liquid can be caused to adhere with desired thicknesses simultaneously on the two surfaces of a sheet and be set by drying or baking. For this reason, the process accord-ing to this invention is extremely efficient, requiring a process time which is approximately one half of that of the conventional process which comprises applying the paint on one surface of the sheet, setting it by drying or baking, then applying the paint on the other surface, and setting the same by drying or baking.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for coating a long sheet material which com-prises passing the sheet material continuously through a body of a coating liquid thereby to cause the coating liquid to adhere to and form coating films simultaneously on the two surfaces of the sheet, regulating the thicknesses of the coating films at specific values by allowing passage of said sheet through a means provided with one or more helical grooves or with one or more helically wrapped steel wires, all of which make an oblique angle with the travelling direction of the sheet, causing the sheet thus coated to travel in its longitu-dinal and horizontal direction as it is supported in a manner providing an unsupported span thereof over a specific length, and setting the coating films on the sheet in this span.
2. Apparatus for coating a long sheet material comprising:
a vessel containing a coating liquid with a constantly main-tained liquid surface level and having opposed upstream and downstream end walls provided therethrough respectively with an inlet and an outlet both of horizontal slit shape disposed at a height level below the liquid surface level; means for causing the long sheet material to travel in a longitudinal direction longitudinally and continuously through the coating liquid, entering the vessel through the inlet and exiting through the outlet, thereby to coat simultaneously and con-tinuously the two surfaces of the sheet material with respective films of the coating liquid; means for regulating the thicknesses of the coating liquid films on the sheet material exiting from the vessel at specific values, said means being provided therearound with one or more helical grooves or with one or more helically wrapped steel wires, all of which grooves and wires making an oblique angle with the travelling direction of the sheet; and means for supporting the sheet material thus coated in a manner to provide an unsupported span thereof of a length sufficient for setting of the coating liquid films thereon.
a vessel containing a coating liquid with a constantly main-tained liquid surface level and having opposed upstream and downstream end walls provided therethrough respectively with an inlet and an outlet both of horizontal slit shape disposed at a height level below the liquid surface level; means for causing the long sheet material to travel in a longitudinal direction longitudinally and continuously through the coating liquid, entering the vessel through the inlet and exiting through the outlet, thereby to coat simultaneously and con-tinuously the two surfaces of the sheet material with respective films of the coating liquid; means for regulating the thicknesses of the coating liquid films on the sheet material exiting from the vessel at specific values, said means being provided therearound with one or more helical grooves or with one or more helically wrapped steel wires, all of which grooves and wires making an oblique angle with the travelling direction of the sheet; and means for supporting the sheet material thus coated in a manner to provide an unsupported span thereof of a length sufficient for setting of the coating liquid films thereon.
3. Apparatus for coating a long sheet material as claimed in claim 2 in which: the coating film thickness regulating means comprises plates respectively disposed above and below the sheet material immediately outside the outlet and being adapted to adjust the flow rate of the coating liquid flowing through the outlet to adhere to the travelling sheet material and regulating rolls for squeezing therebetween the sheet material travelling out of the outlet; the sheet material supporting means comprises the regulating rolls and a sup-porting roller disposed downstream therefrom at a distance therefrom equal to said length sufficient for setting of the coating films; there are further provided means to intercept any coating liquid flowing out of the vessel and to return the same to the interior of the vessel and means for setting the coating films on the sheet material in said span.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6533374A JPS571305B2 (en) | 1974-06-08 | 1974-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1049342A true CA1049342A (en) | 1979-02-27 |
Family
ID=13283876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA228,724A Expired CA1049342A (en) | 1974-06-08 | 1975-06-06 | Simultaneous, continuous coating of both surfaces of long sheet material |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS571305B2 (en) |
| CA (1) | CA1049342A (en) |
| DE (1) | DE2525246C3 (en) |
| FR (1) | FR2273598A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5513638U (en) * | 1978-07-11 | 1980-01-28 | ||
| JPS58112817U (en) * | 1982-01-20 | 1983-08-02 | 三菱重工業株式会社 | Oil splash prevention cover |
| JPH0710374B2 (en) * | 1986-02-03 | 1995-02-08 | 富泰 本多 | Coating and impregnation adjustment method |
| US5169449A (en) * | 1990-07-31 | 1992-12-08 | Raught Jerry E | Apparatus for applying joint compound to corner beads |
| FR2691482A1 (en) * | 1992-05-21 | 1993-11-26 | Ferrari Tissage Enduction Serg | Installation for double-sided coating of fabrics or other flexible supports. |
| FR2943929B1 (en) * | 2009-04-02 | 2012-05-25 | Eberle | DEVICE FOR STITCHING CONTINUOUS STRIKING CARDBOARD STRIPS |
-
1974
- 1974-06-08 JP JP6533374A patent/JPS571305B2/ja not_active Expired
-
1975
- 1975-06-06 CA CA228,724A patent/CA1049342A/en not_active Expired
- 1975-06-06 DE DE19752525246 patent/DE2525246C3/en not_active Expired
- 1975-06-06 FR FR7517802A patent/FR2273598A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE2525246B2 (en) | 1978-11-02 |
| FR2273598B1 (en) | 1978-09-22 |
| FR2273598A1 (en) | 1976-01-02 |
| JPS571305B2 (en) | 1982-01-11 |
| DE2525246C3 (en) | 1979-08-16 |
| DE2525246A1 (en) | 1975-12-18 |
| JPS50156547A (en) | 1975-12-17 |
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