COATING FILM FORMING APPARATUS

• US 20070215045A1
• Filed: 03/16/2007
• Published: 09/20/2007
• Est. Priority Date: 03/17/2006
• Status: Abandoned Application

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Mikami, Yasuomi, Yajima, Kentaroh, Yoshii, Takayuki, HIGAKI, Michitaka
• Application Number:
  US11/687,351
• Publication Number:
  US 20070215045A1
• Time in Patent Office: Days
• US Class Current: 118/680
• CPC Class Codes: B05C 13/025 relatively small cylindrical objects, e.g. cans, bottles
• CPC Class Codes: B05C 5/0208 for applying liquid or other fluent material to separate articles B05C5/0204 takes precedence
• CPC Class Codes: B05C 5/0241 for applying liquid or other fluent material to elongated work, e.g. wires, cables, tubes
• CPC Class Codes: B05C 5/0254 Coating heads with slot-shaped outlet B05C5/0283 takes precedence
• CPC Class Codes: B05C 5/0258 flow controlled, e.g. by a valve B05C5/0262, B05C5/0266 take precedence
• CPC Class Codes: G03G 15/2057 relating to the chemical composition of the heat element and layers thereof
• CPC Class Codes: G03G 2215/2051 Silicone rubber

Abstract

The present invention is directed to a coating film forming apparatus 1. The apparatus 1 includes a coating unit 11, a coating material supply unit 10, and a control unit 12. The coating unit 11 contains a holding unit 18 for holding a substrate 4, a coating nozzle 19, and a movable unit 20. The coating nozzle 19 is provided with a slit for discharge coating material to an inner circumferential surface, formed in annular shape. The movable unit 20 moves the coating nozzle 19 along a shaft center P of the substrate 4. The control unit 12 controls to apply coating material 7 to an outer circumferential surface 4c of the substrate 4 from a lower end 4a upward in order.

Claims

1. A coating film forming apparatus (1) for forming a coating film by applying a coating material on an outer circumferential surface (4c) of an intended-to-be-coated cylindrical object (4) having a shaft center (P), a lower end and an upper end, the apparatus comprising:

a holding unit (18) for holding the object (4) in a condition in which the outer circumferential surface (4c) is exposed and the shaft center (P) is in a vertical direction;

a annular coating nozzle (19) having an inner circumferential surface opposite to the outer circumferential surface (4c) of the object (4) with a space therebetween, placed to be coaxial with the object (4), the inner circumferential surface having slits (31) for discharging the coating material along an entire circumference thereof;

a movable unit (20) for relatively moving the holding unit (18) and the coating nozzle (19) along the shaft center (P);

a coating material supply unit (10) for supplying the coating material to the coating nozzle (19); and

a control unit (12) for controlling the movable unit (20) and the coating material supply unit (10) so that the coating material is discharged from the slits (31) of the coating nozzle (19) opposite to the lower end (4a) of the object (4) and the coating nozzle (19) is moved to the upper end (4b) of the object (4) while discharging the coating material from the slits (31).

2. A coating film forming apparatus as recited in claim 1, wherein the space CG between the outer circumferential surface of the object and the inner circumferential surface of the coating nozzle satisfies the following equation:

(3/2)T≦

CG≦

(1/250)(T²−

340T+312)

where the symbol T represents a thickness of the coating film.

3. A coating film forming apparatus as recited in claim 1 or 2, wherein the control unit controls the movable unit and the coating material supply unit, so that the coating nozzle moves toward the upper end after the coating material discharged from the slits of the coating nozzle, which has stopped opposite to the lower end or the object, has attached to the outer circumferential surface of the object.

4. A coating film forming apparatus as recited in claim 3, wherein the control unit controls the movable unit and the coating material supply unit, so that the coating nozzle moves toward the upper end once again after the discharging of the coating material from the slits of the coating nozzle on the rise is stopped and the movement of the coating nozzle to the upper end has been stopped once with the coating material transferred from the slits to the outer circumferential surface of the object.