JP2524485B2 - Die coater set device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die coater set device for supporting a die body so as to face a continuously conveyed strip-shaped material.

[0002]

2. Description of the Related Art In a die coater for discharging a paint or the like and continuously applying it to a band-shaped material such as a metal plate, a film or a paper which is guided by a backup roll, a glossy coating surface is applied to the surface of the band-shaped material. In order to form, it is important to adjust the gap between the die lip at the tip of the die body and the band-shaped material to be in the optimum range. Therefore, in the conventional die coater, the die lip is opposed to the backup roll, the die body is fixed to the support base, and the support base is linearly moved forward and backward with respect to the backup roll to adjust the gap. .

By the way, when various coating materials are applied by a die coater, the gap range which can stably form a glossy coating surface on the belt-shaped material is determined by the coating material properties (viscosity, surface tension, etc.) and coating conditions (coating speed, coating film). It depends on the thickness). This is because there is an optimum gap range that can stably maintain the paint bead meniscus formed between the die lip and the band-shaped material, depending on the paint properties and coating conditions.
Here, the “bead” refers to a paint reservoir formed in a minute gap between the tip of the die lip and the band-shaped material, and the “bead meniscus” refers to the liquid surface shape of the paint reservoir.

The bead meniscus is governed by four forces acting on the paint. The four forces are viscous force, inertial force, capillary force, and gravity, and a stable bead can be maintained by keeping these forces in balance. For example, even when the same coating material is applied, the above-mentioned inertial force changes when the conveyance speed of the strip-shaped material, that is, the coating speed is changed, and with this change in the inertial force, the shear rate (the coating material applied to the surface of the strip-shaped material is changed. Refers to the gradient of the velocity of flow along the strip of material (see Figure 7).
Since the paint is a non-Newtonian fluid whose viscosity coefficient changes with the change of the shear rate, the above-mentioned viscous force also changes when the shear rate changes. Therefore, by changing the coating speed, the balance of the above four forces will be lost.

Further, when the thickness of the coating film is changed, it is necessary to change the above-mentioned gap, which causes a change in capillary force and a change in shear rate. Of course, when the type of paint is changed, the viscosity and density change, so the balance of the four forces changes. Therefore, in order to maintain the balance of the above four forces and form a stable bead to obtain a glossy coating surface, it is necessary to adjust the gap according to the coating conditions at each time.

[0006]

In the above gap adjustment, the gap is usually set to about 1 to 1.6 with respect to the coating thickness 1 when wet. The die lip at the tip of the die body is composed of an upper lip part and a lower lip part.
Say. ) And the lower lip (hereinafter referred to as the `` lower gap '')
Say. It is common practice to adjust the position of the die body so that the values of () are equal, but depending on the coating conditions, a slightly different value for the upper gap and lower gap can be used to obtain a stable coating state. There is.

For example, if the coating thickness is increased, the amount of paint that spills from the lower lip portion increases, but if the gap of the lower lip portion is reduced to only a few μm by adjusting the position of the die body, the above spillage disappears and a stable coating range can be obtained. It is empirically known that there is. Also, in the case of high-speed coating, there is a phenomenon in which the paint blows out from the upper lip part due to the inertial force of the paint, but if the gap of the upper lip part is reduced to a few μm by adjusting the position of the die body, the above blowout disappears. It has also been found that there is a range in which stable coating can be performed.

The setting conditions of the die body for these stable coatings can be set to the optimum gap based on the calculation result obtained by the paint flow analysis in advance, and the control points can be narrowed down together with the test run results. This enables more rapid adjustment, but at present, the gap is adjusted in most cases while running the strip-shaped material and checking the coating state.

However, in the conventional die coater, as described above, the gap adjustment is performed only by advancing and retracting the die body with respect to the strip-shaped material, so that it takes a lot of time until a stable coating state is obtained. I needed it. Also,
If you tried to set the upper gap and the lower gap to different values with the conventional die coater, you had to move the support itself that fixed the die body in the tangential direction of the backup roll to adjust the height of the die body. Therefore, this setting requires a lot of trouble and time. For this reason, there is a problem in that the band-shaped material is wasted in a large amount when performing the adjustment work while checking the coating state by running the band-shaped material and checking the coating state.

In order to solve the above-mentioned problems, the present invention allows the height and angle of the die body with respect to the backup roll to be arbitrarily adjusted to optimize the gap between the die body and the strip material in a short time. It is an object of the present invention to provide a die coater set device that can set coating conditions.

[0011]

In order to achieve the above-mentioned object, the present invention provides a die coater set device for supporting a die main body so as to advance and retreat with respect to a belt-shaped material guided and conveyed by a backup roll. The height adjusting means and the angle adjusting means for adjusting the height and the angle of the die body with respect to the above are provided.

[0012]

[Function] In the die coater set device, the type of paint,
In addition to advancing and retracting the die body with respect to the backup roll according to the coating conditions such as coating speed, the height or angle of the die body with respect to the backup roll can be adjusted arbitrarily to make the upper gap and the lower gap slightly. It is also possible to adjust the gap so as to have different values, whereby a stable coating state is quickly achieved.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 3 show a die coater set device according to an embodiment of the present invention. FIG. 1 is a side view of the device, FIG. 2 is a top view, and FIG. 3 is III-III in FIG.
It is sectional drawing. A rail guide portion 3 and a bearing portion 4 are provided on the lower surface of the support base 2 in the die coater setting device 1, and the support base 2 is supported by fitting the rail guide portion 3 into the lower rail 5. Further, the screw shaft 6 provided in parallel with the lower rail 5 has the above-mentioned bearing portion 4
It is screwed into a female screw formed inside, and by rotating this screw shaft 6 in the direction of arrow a by a drive device (not shown), the support base 2 moves forward along the lower rail 5 (on the right side in the figure). ) Or backward (left side in the figure).

The support base 2 has an opening 7 that opens upward.
A rail 9 is provided on the bottom surface 8 of the opening 7. A cotter 10 is provided on the rail 9 so that a groove formed on the lower surface of the rail 9 is fitted into the rail 9. The upper surface 1 of this cotter 10
0a has a predetermined angle with respect to the upper surface of the rail 9,
Further, the cotter 10 is formed so as to be inclined so that the width in the height direction becomes larger toward the front part, and inside the cotter 10, a female screw portion is formed which penetrates in parallel with the upper surface of the rail 9. ing. A male screw threaded screw shaft 11 is screwed into a portion of the support base 2 that is located in the opening 7 of the female screw portion, and the front end of the screw shaft 11 has a front end portion. Is rotatably supported by a pin on the front side wall 2a. On the other hand, an elevating handle 12 is attached to the rear end of the screw shaft 11 penetrating the rear side wall 2b of the support base 2 and protruding rearward. By rotating the elevating handle 12, The cotter 10 moves forward or backward.

The opening 7 of the support base 2 is in contact with the inner surfaces of the front side wall 2a and the rear side wall 2b of the support base 2 without any gaps, and can move up and down along the inner surfaces of the lift base 15. Is installed. The lower surface 15a of the lift 15 is formed with the same inclination as the upper surface 10a of the cotter 10 and is in contact with the upper surface 10a. As a result, when the cotter 10 moves forward based on the rotation of the lifting handle 12, the lifting table 15 descends and the cotter 10 moves.
When 15 moves backward, the lifting table 15 is raised. Then, the height fixing bolt 16 which is penetrated to the opening 7 and screwed in on the upper portion of the rear side wall 2b of the support base 2 is tightened, and the tip end thereof is pressed against the side surface of the lift base 15. The lifting table 15 can be held at a desired height.

A bearing portion 17 formed of a through hole is formed on the upper portion of the lift table 15. As shown in FIG. 2, a shaft 22 inserted into the center of a boss portion 21 fixed to one end of the die set base 20 is inserted into the bearing portion 17, and the die set base 20 is centered around the shaft 22. It is pivotally supported. Further, the die set table 20 has a substantially L-shaped cross section along the longitudinal direction thereof, and the supporting portion 23 is provided at a position of the supporting portion 23 projecting forward to face the elevating table 15. The angle fixing bolt 24, which is inserted into the through hole and is fixed by screwing the tip end thereof into the lift table 15, and the screw hole penetrating the support portion 25, are screwed into the top end of the lift table 15. An angle adjusting bolt 25 which is brought into contact with is provided. As a result, when the angle fixing bolt 24 is loosened and the angle adjusting bolt 25 is rotated, the die set table 20 is
Is rotatable about the shaft 22 so that the angle of the die body 30 fixed to the upper surface of the support portion 2 can be adjusted.

An arrow 26 is provided on the uppermost part of the boss portion 21 provided on the die set table 20, and a scale 27 is provided in a predetermined range on the uppermost part of the lift table 15 facing the arrow 26. By aligning the arrow 26 with the central scale of the scale 27, the upper surface of the support portion 23 and the upper surface of the lower rail 5 are parallel to each other. The angle of the die set table 20 can be adjusted by using the scale 27 as a guide. 29 is a die body 30
Is a side wall that seals the side part of the.

The structure described above is similarly provided on the other end side of the die set table 20.

The die body 30 is, as shown in FIG.
It is composed of an upper metal member 31 and a lower metal member 32. The upper metal member 31 is placed on the lower metal member 32 and is placed on the support portion 23 in a state of being integrally connected with a plurality of bolts 33. Further, a plurality of cotters 3 arranged in the longitudinal direction of the die body 30 are provided behind the die body 30 and between the die set table 20.
5 and a pad plate 39 are provided, and the die body 30 is fixed to the die set table 20 by a plurality of bolts 34 inserted from the rear portion of the die set table 20 at positions where the cotter 35 and the pad plate 39 do not exist. ing.

The rear side surface 35a of the cotter 35 is in contact with the rear wall surface of the die set table 20, and the front side surface 35b is formed with a predetermined inclination with respect to the rear side surface 35a. In addition, the front side surface 3 of the cotter 35 is provided at the rear portion of the backing plate 39 which is disposed with the front side surface abutting the die body 30.
An inclined surface 39a having the same inclination as 5b is formed,
The inclined surface 39a is in contact with the front side surface 35b of the cotter 35. Further, inside the cotter 35, a screw hole 36 having an internal thread is formed on the inner circumference.
Includes the upper end 28 of the die set base 20 and the mounting base 23 described above.
A screw shaft 37 having a male screw portion is screwed into the portion sandwiched on the upper surface. A lower end portion of the screw shaft 37 is rotatably supported by a pin on the support portion 23, and the upper end portion of the screw shaft 37 protruding upward through the upper end portion 28 of the die set table 20 has an advancing / retreating handle. 38 is attached. As a result, when the bolt 34 is loosened and the advancing / retreating handle 38 is rotated, the cotter 35 is raised and the die body 30 is pushed forward together with the contact plate 39, so that the front-back position of the die body 30 can be adjusted. There is. When the cotter 35 is lowered by rotating the advancing / retreating handle 38 and the bolt 34 is tightened, the die body 30 is retracted.

The die body 30 is arranged such that the die lip 40 composed of an upper lip portion 41 and a lower lip portion 42 faces the strip material W guided by the backup roll 100 and conveyed in the direction of arrow b. . In addition, top metal fittings 3
A slot 45 is formed between 1 and the lower metal part 32, and the paint supplied from the paint supply port 46 on the upper surface of the upper metal part 31 is sent to the slot 45 via the manifold 47 and the paint supply passage 48, and the upper lip is formed. The material is discharged from between 41 and the lower lip 42 and applied to the band-shaped material W.

In the die coater set device 1 having the above structure, the gap adjustment is performed as follows. First, as shown in FIG. 4, the die body 30 is initialized so that the center line X of the slot 45 is orthogonal to the strip material W. Specifically, the boss 2 at the end of the die set table 20
The angle adjustment bolt 25 is adjusted so that the arrow 26 attached to 1 corresponds to the center scale of the scale 27, and then the angle fixing bolt 24 is tightened to fix the die main body 3
Fix the angle of 0. Then, the lifting handle 12
Is rotated to a height at which the center line X of the slot 45 is orthogonal to the strip-shaped material W, that is, the height at which the center line X is directed to the rotation center of the backup roll 100.
And tighten the height fixing bolt 16 to adjust the die body 3
Fix the height of 0.

At the forward position of the die body 30, the support base 2 is moved to the backup roll 1 based on the driving of a driving device (not shown).
00, the die main body 30 is once set to a position where the gap between the die lip 40 and the strip-shaped material W is near the optimum gap where a stable coating state is obtained, and then the advance / retreat handle 38 and the bolt 34 are operated. The die body 30 is slightly advanced or retracted to adjust the gap to an optimum value. In the initial setting state thus adjusted, the upper gap G1 and the lower gap G2 are set to be equal, as shown in FIG.

If the bead cannot be stabilized by simply advancing and retracting the die body 30 as described above in accordance with the change in the coating conditions and the stable coating state cannot be obtained, the coating state of the strip material W is changed. While checking, the height or angle of the die body 30 can be easily adjusted in the above manner. Figure 5
Shows the relationship between the upper gap and the lower gap when the height of the die body 30 is changed from the initial setting state, and FIG. 6 shows the upper gap and the upper gap when the height and angle of the die body 30 are changed from the initial state. The relationship of the lower gap is shown. If the height of the die body 30 is lowered as shown in FIG. 5 (1), the lower gap G2 becomes slightly larger than the upper gap G1, and conversely, as shown in FIG. If the height is increased, the upper gap G1 is larger than the lower gap G2.
Is slightly larger. The same applies to the case where the height and the angle of the die body 30 are changed. When the die lip 40 is lowered as shown in FIG. 6A, the lower gap G2 is slightly larger than the upper gap G1. If the die lip 40 is raised as in 2), the upper gap G1 becomes slightly larger than the lower gap G2.

Since the height and angle of the die body 30 are usually adjusted in micron units, the tip of the dial gauge 50 is provided in contact with the lower surface of the support plate 23 on which the die body 30 is placed, and this measurement is performed. It is preferable to adjust based on the value.

As described above, the die coater setting device 1
Then, the die body 30 with respect to the backup roll 100
In addition to advancing and retreating, the height and angle of the die body 30 can be arbitrarily adjusted while checking the coating state, so that the gap adjustment to obtain a stable coating state can be flexibly performed and the coating conditions can be changed. Can be dealt with quickly.

Although the mechanism for adjusting the forward position, height and angle of the die body 30 in the die coater setting device 1 is manually operated, the front part or a part of these adjustments should be electrically controlled. Further, since the stable coating surface by the die coater is a mirror surface, it is possible to perform automatic control in which the coating surface is monitored by a sensor and the forward position of the die body is adjusted electrically.

Further, in the die coater, as the distance between the upper lip and the lower lip becomes longer as the number of layers increases, it becomes difficult to adjust the initial gap, and it is necessary to adjust the gap while checking the coated surface. The die coater set device 1 capable of flexibly adjusting not only the forward and backward movements of the main body but also the height and angle can be effectively applied not only to a single-layer die coater but also to a two-layer or multi-layer die coater.

[0029]

As is apparent from the above description, according to the die coater set device of the present invention, not only is the die body moved forward and backward with respect to the backup roll,
The height and angle of the die body can be set arbitrarily, and the gap can be flexibly adjusted according to various coating conditions. Therefore, even if the coating conditions are changed, it is possible to shorten the time until the die body is set to the optimum gap that provides a stable coating state, and if the coating conditions are changed during operation, the strip material Waste can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a die coater set device according to the present invention.

FIG. 2 is a top view of a die coater set device according to the present invention.

FIG. 3 III-I in the die coater set device of FIG.
It is II sectional drawing.

FIG. 4 is a diagram showing a gap relation in an initial setting state of a die body.

FIG. 5 is a diagram showing a gap relationship when the height of the die body is changed from the initial setting.

FIG. 6 is a diagram showing a gap relationship when the height and angle of the die body are changed from the initial setting.

FIG. 7 is a diagram for explaining a shear rate of paint.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Die coater setting device, 2 ... Support stand, 10 ... Cotter, 11 ... Screw shaft, 12 ... Lifting handle, 15 ... Lifting stand, 20 ... Die set stand, 22 ... Shaft, 25 ... Angle adjusting bolt, 30 ... Die body , 100 ... Backup roll,
W ... Strip material

Claims (1)

(57) [Claims] 1. In a die coater set device for supporting a die main body so as to be able to advance and retreat with respect to a belt-shaped material conveyed while being guided by a backup roll, height adjusting means capable of arbitrarily adjusting the height and angle of the die main body with respect to the backup roll. A die coater set device characterized in that an angle adjusting means is provided.