JPS6344022B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a roll coater for applying a high viscosity liquid paint, in which an applicator roll 2 is brought into rolling contact with a coater roll 1, and a doctor roll 3 is brought into rolling contact with the applicator roll 2. The present invention relates to a roll coater characterized in that the doctor roll 3 is formed into a cylindrical shape whose diameter gradually decreases from the center toward both ends.

Generally, a roll coater is composed of a coater roll 1, an applicator roll 2 in rolling contact with the coater roll 1, and a doctor roll 3 in rolling contact with the applicator roll 2, as shown in FIG.
When a double coated object 5 is passed between the coater roll 1 and the back-up roll 4, the paint 7 supplied from the supply port 6 between the doctor roll 3 and the applicator roll 2 passes through the applicator roll 2 to the coater roll. The coating material is transferred onto a roll 1 and coated onto an object 5 by a coater roll 1. However, in such a conventional example, if the paint 7 to be applied is a high viscosity liquid, the speed at which the paint 7 spreads in the roll axis direction between the doctor roll 3 and the applicator roll 2 is as shown in FIG. It has the disadvantage that uneven coating occurs slowly. This tendency becomes more pronounced as the circumferential speed of the roll increases.

The present invention has been made in view of the above points, and an object of the present invention is to provide a roll coater that can quickly spread the paint in the roll axis direction and apply it at high speed even if the paint is a highly viscous liquid. It is in.

The present invention will be explained in detail below with reference to Examples. The coater roll 1 and the applicator roll 2 are cylindrical rolls, and the doctor roll 3 is formed in a cylindrical shape with a large diameter at the center and narrow diameters at both ends, as shown in FIG. The gradient in which the diameter of the doctor roll 3 decreases is about 1/300. However, since the nip pressure between the applicator roll 2 and the doctor roll 3 is high at the center of the roll, the paint 7 that has fallen from the supply port 6 to the X section in Fig. 3 is pushed out at high speed to both ends of the roll, resulting in high viscosity. liquid paint 7
Even if it is, it spreads quickly and smoothly to both ends.
Therefore, the paint can be uniformly applied to the object 5 to be painted.

As described above, in the present invention, the doctor roll is shaped like a cone whose diameter gradually decreases from the center to both ends, so even if the paint is a highly viscous liquid, the paint supplied between the doctor roll and the applicator roll can be quickly moved toward both ends. It has the advantage that it can be applied uniformly even if the peripheral speed of the roll is high.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional example, FIG. 2 is a plan view showing the same drawbacks, and FIG. 3 is a plan view of an embodiment of the present invention, in which 1 is a roll coater, 2 is an applicator, and 3 is a plan view of an embodiment of the present invention. is a doctor roll.

Claims (1)

[Claims] 1. A roll coater in which an applicator roll is in rolling contact with the coater roll, and a doctor roll is in rolling contact with the applicator roll, characterized in that the doctor roll is formed in a cone shape whose diameter gradually becomes smaller from the center toward both ends. roll coater.