JPH0429887Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a coater applied to adjust the coating amount in the width direction.

(Prior Art) FIGS. 6 to 8 show operating conditions of a conventional coater and the structure of a device for adjusting the coating amount in the width direction. In the figure, a sheet 2 is running in the direction of the arrow while holding a bucking roll 1. After the coating liquid 3 indicated by diagonal lines is applied to the sheet 2, the excess liquid is scraped off with a blade 4 to smooth the coated surface. The blade 4 for smoothing the coating amount and the blade presser foot 5 for pushing and pulling it are installed at a position close to the backing roll 1 at the top of the doctor bag 6.
The length of the blade 4 and the blade presser foot 5 in the width direction extends over the entire width of the backing roll 1, and the blade 4 is pressed by the blade presser foot 5 and is close to the backing roll 1.

And blade 4, doctor bag 6, seat 2
If the uniformity of the coating amount in the width direction deteriorates due to non-uniformity of the
By turning the adjustment bolts 7 arranged at , the blade presser foot 5 is moved in and out, and the blade 4
The amount of coating is made uniform by adjusting the gap between the backing roll 1 and the backing roll 1. In this case, on the blade presser foot 5,
At an appropriate pitch in the width direction (for example, 100mm),
As shown in Figure 8B, a slit 5a may be made to allow the blade presser foot 5 to move in and out locally in the width direction, or it may be divided into appropriate lengths as shown in Figure 8B. The blade 4 is locally pushed out or retracted (when the blade presser foot 5 is pulled back, the pushed-out blade 4 returns to the position of the blade presser foot 5 due to its own elasticity), and the blade 4 and the blade 4 are separated. A method is used in which the gap with the king roll 1 is locally adjusted to achieve a uniform coating amount. In this case, the collar 7a of the adjustment bolt 7 is fitted into the holder 8 as shown in FIG. moves toward the punching roll 1, and when turned to the right, moves away from it. Further, in order to turn the adjustment bolt 7, a method is adopted in which an actuator 9 is used to rotate it manually or automatically. The actuator 9 includes a combination of an electric motor and a speed reducer, a motor using hydraulic pressure or pneumatic pressure, and the like.

(Problem that the invention aims to solve) In the conventional coater, when the adjustment bolt is operated, the reference point cannot be determined (even if the blade presser foot 5 is marked with a scale to indicate the amount of inflow and outflow, it cannot be used as a rough guide). ), it takes time to return to the reference point when changing blades. Furthermore, if a device is installed to automatically rotate the adjustment bolt, a large device will be attached to the driver's side, resulting in poor operability.

Furthermore, in the conventional case, the amount of coating is controlled by pushing and pulling the blade, so there is a risk of play in the mechanism, especially in the threaded part of the adjustment bolt and the blade presser that fits into it. has some play for rotation, and the play (in the axial direction) must be compensated for when pushing and retracting. Therefore, with an adjusting device that requires adjustment in μ units, the reproducibility is poor and the adjustment is difficult. There were some difficult problems.

The present invention attempts to solve the problems with the conventional coater.

(Means for solving the problem) Therefore, the present invention is a coater that applies a coating liquid to a sheet running along a bucking roll and then scrapes off the excess liquid with a blade to create a smooth coated surface. In this method, a large number of temperature control mechanisms are arranged in the width direction opposite to the bucking roll, and this is used as a means for solving the problem.

(Function) The diameter of the bucking roll can be easily changed by heating and cooling of temperature control mechanisms disposed in a number of widthwise directions facing the bucking roll. Therefore, the gap between the bucking roll and the blade can be adjusted.

(Embodiment) The present invention will be described below with reference to the embodiments shown in the drawings. As shown in FIG.
The doctor bag 6, adjustment bolt 7, etc. are the same as the conventional ones, so a detailed explanation of them will be omitted. The reason why the amount can be adjusted in the width direction will be explained.
In this case, the adjustment bolt 7 may be adjusted to the extent that it takes care of the quirks of the machine.

Now, as shown in FIG. 1, a hot air nozzle 10 and a cold air nozzle 11 are installed at a position opposite to the running path of the doctor bag 6 and the sheet 2 (a position that does not interfere with operation inspection). In the width direction, as shown in Figure 3, set an appropriate pitch (for example,
100 mm), and a pair of hot and cold air nozzles 10 and 11 are arranged. Each hot and cold air nozzle 10 and 11
There are on-off valves 12 and 1 that adjust the opening degrees of the hot and cold air passages using air pressure with diaphragms, respectively.
3, into which air pressure calculated by the computer 14, which will be described later, flows into the on-off valves 12 and 1.
Adjust the hot and cold air passages in step 3, and punch roll 1.
The temperature of the surface 1a of the backing roll 1 is adjusted by changing the amount of air blown to the backing roll 1, and the diameter of the backing roll 1 is changed.

As an example, if the coating amount is 15g/m ² ±1g/m ² and the specific gravity of the coating liquid is 1.5, the coating thickness will be 10μ±0.7μ,
The diameter of bucking roll 1 is 965mm, and the surface is 5000mm.
mm, and when the material of the backing roll 1 is iron-based and the outer circumference is wrapped with rubber with a thickness of 25 mm, the part of the adjacent backing roll 1 (for example, the pitch is 100
A diameter difference of 20 μm (twice the coating thickness) occurs at a temperature difference of about 40° C. on the surface 1a of the backing roll 1. In this way, the coating amount can be adjusted with a small temperature difference, and fine adjustment is also possible. Therefore, the thickness of the sheet 2 and the curl of the blade 4 can be adjusted by changing the diameter of the bucking roll 1. Further, as shown in FIG. 5, it can be easily controlled by determining whether to control by sheet thickness + coating amount or by coating amount alone.

Further, the coating amount in the width direction of the sheet 2 is measured with a basis weight meter 15 installed at the rear of the coating section of the coater, and this value is input to the computer 14 to detect discrepancies in the width direction. The amount is calculated and becomes an air pressure signal to be supplied to the on-off valves 12 and 13 by the supply valve 16.
Supplied via.

(Effects of the invention) Since the present invention is constructed as explained in detail above, the problems caused by the use of conventional adjustment bolts are eliminated, and a small temperature difference can be adjusted in the width direction of the bucking roll. By generating this, the coating amount can be adjusted by easily and minutely changing its diameter. Incidentally, if a basis weight meter is provided to measure the amount of coating, and this is input into a computer for calculation, differences in the amount of coating can be automatically equalized. Moreover, since this control is automatic control, the adjustment device can be installed on the opposite side from the side where it is operated and inspected, making it easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view of a coater showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional detail view of section A in FIG. 1, and FIG. 3 is a front view of the main parts in FIG. 1. Fourth
Figures 4 and 5 respectively show the coating conditions according to the coating amount control criteria. Figure 4 explains the case when the sheet thickness + coating amount is constant, and Figure 5 explains the case when the coating amount is constant. Figure 6 is a partial cross-sectional side view of a conventional coater, Figure 7 is a detailed partial cross-sectional view of section B in Figure 6, and Figures 8 A and 8 are different examples of conventional blade pressers. FIG. Explanation of the main parts of the diagram, 1... Bucking roll, 1a... Roll surface, 2... Sheet, 3...
Coating liquid, 4... Blade, 10... Hot air nozzle,
11...Cold air nozzle, 12, 13...Opening/closing valve, 1
4...computer, 15...basis weight meter, 16...
Supply valve.

Claims (1)

[Scope of utility model registration request] In a coater that applies a coating liquid to a sheet running along a bucking roll and then scrapes off the excess liquid with a blade to make a smooth coated surface, a large number of coaters are arranged in the width direction opposite the backing roll. A coater characterized in that it is equipped with a temperature control mechanism.