JP3015587U - Rotary spray coating machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotary spray coating machine capable of simultaneously ejecting paint particles having a large particle diameter and paint particles having a small particle diameter. [Structure] A cup body in which grooves having a constant width and extending in the edge direction are provided at a constant interval on the inner circumference of the taper-shaped edge toward the outside so that the edge is on the tip side In a coating machine that is fixed to a rotating device and supplies paint to the inner wall surface on the bottom side of the cup body to spray paint particles from the edge of the cup body, the width of the edge groove of the cup body is partially changed. Made wide.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary spray coating machine capable of simultaneously discharging paint particles having a large particle size and paint particles having a small particle size.

[0002]

[Prior art]

 As a pattern-coated metal plate, there is a plain paint film in which different one color or two or more different color paint patterns are dispersed in spots. This metal plate has a single color tone over the entire surface of the metal plate. It is usually manufactured by a method of spraying a pattern paint having a different color tone when the coating film is in an undried state or after being dried by applying the base paint of No. When spraying the pattern paint by this method, if a spray gun of a method of atomizing the paint with air is used, the spread of the spray pattern is small. -Need more than one to spray-and spray gun needs to be separated from the metal plate, so spray paint will be scattered inside the room and worsen the working environment. Further, if spraying is continued for a long time, nozzle clogging occurs and the paint drips.

A rotary spray coating machine is known as a coating machine that solves the drawbacks of the spray gun. As shown in FIGS. 3 and 4, this coating machine has a taper inner peripheral edge, and a constant groove 1 extending in the edge direction with a constant width. The cup body 2 provided at intervals is fixed to the rotary shaft 4 of the air motor-3 with the screw 5 at the edge of the cup body 2, and the paint supply pipe 6 is placed inside the bottom portion of the cup body 2. After being inserted, the paint supply valve 7 of the paint supply pipe 6 is fixed to the outer periphery of the air motor-3. To fix the cup body 2 to the rotary shaft 4, a pedestal 8 that partitions the inside into a front end side and a bottom side is provided approximately in the middle of the cross section of the cup body 2, and the center is fixed to the rotary shaft 4 with a fixing screw 5. There is. The coating material discharge ports 9 are provided at equal intervals on the outer periphery of the pedestal 8 so that the coating material from the coating material supply pipe 6 is supplied to the tip side wall surface of the cup body 2.

In this coating machine, when the cup body 2 is rotated at high speed with the edge of the cup body 2 on the lower side and the paint is supplied from the paint supply pipe 6 to the bottom of the cup body 2, The paint moves around the pedestal 8 by centrifugal force and is supplied to the discharge port 9. Then, it is further supplied from the outlet 9 to the inner wall surface on the tip end side of the cup body 2, descends while being transmitted through the inner wall surface by centrifugal force, and reaches the edge portion. Then, when the paint reaches the edge, it is gradually cut out by the groove 1, and the paint particles are blown out in the horizontal direction by the centrifugal force. For this reason, the spray pattern spreads widely, and it is not necessary to separate the spray pattern from the metal plate, and nozzle clogging does not occur.

However, since this spray coating machine is intended to form a uniform coating film, the sprayed coating particles are uniform. For this reason, when used in the production of the pattern-coated steel sheet as described above, there are problems that the dimensions of the pattern coating film are uniform, there is no change in appearance, and the designability is poor.

[0006]

[Problems to be solved by the device]

 Therefore, the present invention provides a spray coater capable of spraying a mixture of paint particles having different sizes.

[0007]

[Means for Solving the Problems]

 The present invention partially widens the width of the edge groove of the cup body.

[0008]

[Action]

 As a result of a thorough study so that the spray paint particles of different sizes may be mixed, the present inventors have found that the size of the paint particles depends on the width of the groove at the edge of the cup body. When the width of the groove was partially widened, it was found that the paint particles of different sizes were sprayed in a mixed state.

[0009]

【Example】

 It is a cup body (diameter 50 mm) that is standardly attached to a commercially available rotary spray coating machine [manufactured by Asahi Sunac Co., Ltd., trade name: ESPOTA-BO ES A87 type], and has a groove (depth 0.15 mm, at the edge). (Width 0.13 mm) is continuously provided as shown in FIG. 1 (A), but the convex portion between the edge grooves is one or continuous as shown in FIGS. 1 (B) to (E). Books were cut at equal intervals to prepare pattern-coated steel sheets. In addition, in (B) to (E) of FIG. 1, (B) is one cut for every five convex portions, (C) is one for every three convex portions, and (D) is Two protrusions are continuously cut for every five protrusions, and (E) is two continuously cut for every two protrusions.

[0010] The steel sheet was coated on a roll coater by applying a galvanized steel sheet having a plate width of 331 mm at a speed of 30 m / min while coating the undercoat paint so that the dry film thickness was 11 μm. After baking and drying, the topcoat paint is applied to a dry coating film thickness of 13 μm, and the spray coating machine (nylon beer coating Spray, No. 4 Zahn cup viscosity 40 sec) was sprayed. No matter which cup body was used, the spraying was performed under the conditions that the distance between the steel plate and the edge of the cup body was 150 mm and the air pressure for the air motor was 2.0 kg / cm ² (rotation speed 9600 rpm). Figure 2 shows the obtained patterned steel sheet.

[0011]

[Effect of device]

 As described above, according to the spray coating machine of the present invention, a mixture of paint particles having different sizes can be sprayed, and thus various patterned steel sheets having different appearances can be manufactured.

[Brief description of drawings]

FIG. 1 is a schematic sectional development view of a groove provided on an edge portion of a rotary spray coating machine used in Examples.

FIG. 2 shows the size and distribution state of the pattern coating film of the pattern-coated steel sheet manufactured by mounting the cup bodies having different cup body grooves on the rotary spray coating machine in the example.

FIG. 3 is a schematic cross-sectional view of a rotary spray coating machine.

FIG. 4 is an enlarged partial plan view of the cup body of the rotary spray coating machine.

[Explanation of symbols]

1 ... Groove, 2 ... Cup body, 3 ... Air motor, 4 ... Rotating shaft, 5 ... Fixing screw, 6 ... Paint supply pipe, 7 ... Paint supply valve, 8 ... Pedestal, 9 ... Discharge port,

Claims (1)

[Scope of utility model registration request] 1. A cup body in which grooves having a constant width and extending in the edge direction are provided at a constant interval on the inner circumference of the taper-shaped edge toward the outside, and the edge is on the tip side. In the coating machine in which the paint is supplied to the inner wall surface on the bottom side of the cup body so as to spray the paint particles from the edge portion of the cup body, the width of the edge groove of the cup body is fixed. A rotary spray coating machine characterized by being partially widened.