JP2929189B2 - Double-sided simultaneous coating 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 double-sided simultaneous coating apparatus for simultaneously coating a coating liquid on both sides of a band-shaped substrate such as a plastic film, cloth, metal plate or paper.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 8, a double-sided simultaneous coating apparatus comprises a coating liquid reservoir 1 provided with a liquid reservoir 1a in which a substrate transport path R is immersed, and a liquid reservoir 1a. A squeeze roll 2 disposed on the material discharge side, and apply the coating liquid H to both sides of the band-shaped base material A passing through the liquid reservoir 1a, and regulate the thickness of the coating film when passing through the squeeze roll 2. Things.

[0003]

The conventional double-sided simultaneous coating apparatus is suitable for a low-viscosity coating liquid, but is not suitable for a high-viscosity coating liquid. Because the fluidity of the high-viscosity coating liquid is very poor, it is very difficult to immerse the base material A in the reservoir part 1a. This is because it is very difficult to regulate the film thickness of the applied coating liquid with the squeeze roll 2 and to obtain a smooth coating film surface. SUMMARY OF THE INVENTION An object of the present invention is to provide a double-sided simultaneous coating apparatus capable of simultaneously coating both sides of a high-viscosity coating liquid, which has been impossible in the past.

[0004]

Means adopted by the double-sided simultaneous coating apparatus according to the present invention (hereinafter, referred to as "the apparatus of the present invention") is to apply two dies facing each other via a base material conveying path to a predetermined coating. Each die is provided so as to be able to stop at a processing position, and each die is provided with a coating liquid extrusion slit extending along a direction traversing the transport path, and A lip surface facing a local portion of the path and forming a coating liquid reservoir space between the local portion and a coating film forming gap between an outlet edge of the lip surface and the transport path. both die, when stopped at the predetermined coating positions by Rukoto are opposed to ripple <br/> flop surface each other was stopped through the conveyance path,
Coating liquid reservoir space formed by both lip surfaces and coating film type
Each of the formed gaps faces each other via the transport path . Further, in the apparatus of the present invention, the coating liquid extrusion slit may be opened at an entrance edge of the lip surface.

The operation of the apparatus according to the present invention will be described below with reference to an embodiment shown in the drawings. As shown in FIGS. 1 and 2, the coating liquid was quantitatively extruded from the coating liquid extruding slits 13 and 14 of the dies 11 and 12 toward the belt-shaped substrate A passing through the substrate conveying path R at a constant conveying speed. High viscosity (for example,
30 to 100,000 cps) of coating liquids B ₁ and B ₂
Guided to the base material A, it reaches the opposite coating liquid storage spaces S ₁ and S ₂ formed between the base material A and the lip surfaces 15 and 16,
The coating liquid reservoir B ₁ -1 constant thickness, to form a B ₂ -1. versus
Coating liquid reservoirs B ₁ −1 and B _{1 of the} opposite coating liquid reservoir spaces S ₁ and S _2
2 -1, the coating solution B _1, B pressure receiving continuous supply of ₂ rises, the surface of the base material A local Aa-1, Aa-2
Is pressed from both sides with a balanced internal pressure. Pressed substrate A
Passes through the intermediate position of the lip surface 15 and 16, the outlet edge 15a of the lip surfaces 15 and 16, 16a and the substrate surface Aa, coating film forming gaps E ₁ facing between Aa, E _Two
It is formed and to maintain this gap dimension W ₁ -1, W ₁ -2 constant value. The coating liquid reservoir B ₁ -1, B ₂ -1 coating solution B ₁ to increase the internal pressure in, B ₂ is the substrate surface local Aa-1, A
a-2, a fixed gap size W ₁ -1, W ₁
-2, passing through the opposing coating film forming gaps E ₁ and E ₂ ,
Both surfaces Aa of the substrate A, constant Aa thickness W ₂ -1, W ₂ -
2 of the coating film B ₁ -2, to form a B ₂ -2.

[0006]

(First Embodiment) FIGS. 1 to 4 show a device 10 of the present invention according to a first embodiment. As shown in FIG. 1, the apparatus 10 of the present invention is provided with two dies 11 and 12 facing each other via the transport path R at an appropriate position outside the substrate transport path R. The transport path R is formed in a vertical state, a horizontal state (not shown), or an inclined state between the guide roll 45 and the floating drying device 46 or the like. In the case of a belt-shaped substrate A (for example, cloth) to which a high tension cannot be applied in the transport direction (arrow C direction), a clip for gripping the ear end of the substrate A is provided on both outer sides of the transport path R. A chain (not shown) will be provided.

Each of the dies 11 (12) is provided with a coating liquid extrusion slit 13 (1
4), and as shown in FIG.
4) The coating liquid storage space S faces the local part Ra of the transport path R located on the base material unloading side and between the local part Ra.
₁ (S ₂ ) and a rigid lip surface 15 (16). The dies 11 and 12 are arranged such that the lip surfaces 15 and 16 are opposed to each other via the transport path R.

As shown in the front view of FIG. 3 and the cross-sectional view of the left side of FIG. 4, the dies 11 (12) are supported by guides 18 (19) so as to be movable toward and away from the transport path R. Each of the guides 18 and 19 includes left and right fixed side frames 20 and 2.
1, a guide frame 22, 23, a moving frame 24 which is smoothly guided by the guide rails 22, 23 and retreats toward the transport path R and supports and fixes the die 11 or 12. The moving frame 24 has output terminals 26a,
A driving means 25 comprising left and right air cylinders 26, 26, etc., connected to the movable frame 26a for driving the moving frame 24 forward and backward.
And right and left stoppers 27, 27 for stopping the moving frame 24 at the predetermined coating position and adjusting the distance between the lip surfaces 15, 16 of the opposing dies 11, 12.

As shown in FIGS. 1 and 2, the die 11 (12) is divided into two bodies 28, 29 (30, 3).
1) and lips 32, 33 (34, 3) made of a rigid material attached to the tips of the bodies 28, 29 (30, 31).
5), and a coating liquid extrusion slit 13 (14) is formed between the lips 32, 33 (34, 35).
Between 8, 29 (30, 31), a manifold for uniformly dispersing the coating liquid B in the longitudinal direction of the coating liquid extrusion slits 13 (14) (that is, in the transverse direction of the substrate transport path R). 38 (39) are formed, and a coating liquid supply hole (not shown) is formed in the body 28 (30).

The die 11 (12) is provided with a coating liquid supply device.
(Not shown) to the coating liquid supply hole from the coating liquid B ₁ (B ₂ )
Is supplied, the coating liquid B ₁ (B ₂ ) is supplied to the manifold 3
8 (39), uniformly dispersed in the longitudinal direction, guided to the coating liquid extrusion slit 13 (14), and pushed the coating liquid B ₁ (B ₂ ) toward the base material A passing through the belt-shaped conveyance path R. put out. As shown in FIG. 2, the coating liquid B ₁ (B ₂ ) extruded on the surface local portion Aa-1 (Aa-2) of the substrate A is applied to the substrate A being conveyed at a constant speed in the direction of arrow C. Accompanying wedge-shaped coating liquid storage space S ₁
(S ₂ ), and the coating liquid reservoir B ₁ -1 (B ₂
-1) is formed. This coating liquid reservoir B ₁ -1 (B ₂ -1)
Of the coating liquid B ₁ (B ₂ ), the internal pressure of the coating liquid B ₁ (B ₂ ) increases due to the continuous supply of the coating liquid B ₁ (B ₂ ).
(Aa-2) in a state that Nurigi constant gap size W ₁ -1
(W ₁ -2) of the coating film forming gaps E ₁ passes through the (E _2), a constant thickness W ₂ -1 on both sides of the substrate A, W ₂ -2 of the coating film B ₁ -2 ( B ₂ -2) to form a. In the case of the coating liquid B ₁ (B ₂ ) having thixotropic properties, the viscosity instantaneously decreases due to an appropriate shearing force received in the coating liquid storage space E ₁ (E ₂ ), and the substrate surface Aa ( Aa) is smoothly applied.

The apparatus 10 of the present invention is capable of simultaneously coating both sides of a high-viscosity coating solution B ₁ (B ₂ ) and a low-viscosity coating solution.

(Second Embodiment) FIGS. 5 to 7 show a double-sided simultaneous coating apparatus 50 related to the apparatus of the present invention. The feature of the double-sided simultaneous coating apparatus 50 of the second embodiment is that the both sides Aa, Aa of the thin band-shaped base material A are uniformly coated along the strip-shaped base material transport direction (the direction of arrow C). One die 11 of the two dies 11 and 12 is fixed at a predetermined coating position so that coating with a coating thickness can be performed, and the other die 12 can be separated and moved toward and away from the substrate transport path R. Place and die 12
Is pressed toward the transport path R by the pressing means 55.

The difference between the double-sided simultaneous coating apparatus 50 of the present embodiment and the apparatus 10 of the first embodiment is that the die 1
Left and right stoppers 5 provided on guide 19 for guiding 2
7, 57 and pressing means 55. Each stopper 57
The tip end 57a of the stopper abutting on the moving frame 24 is movable forward and backward. The advancing / retreating area of the stopper tip 57a corresponds to a state where the lip 35 (see FIG. 7) of the die 12 is brought into contact with the transport path R from a forward standby position (see FIG. 6A) where the die 12 is temporarily stopped at a position close to the transport path R. It is up to the coating position where it can touch (see Fig. (B)).

The pressing means 55 is used to move the left and right output ends 56a moving toward the substrate transport path R to the moving frame 2.
4 is a pair of left and right air cylinders 56, 56. An air piping system (not shown) for supplying compressed air to the left and right air cylinders 56, 56 moves the die 12 from the retreat standby position (see FIG. 5) to the lip 35 (see FIG. 7).
After supplying compressed air to advance to a forward standby position (see FIG. 6A) where the leading end of the stopper approaches the transport path R, the stopper tip 57a moves backward toward the coating position (see FIG. 6B). To start the air cylinder 56
And supply compressed air at a desired pressure to each output terminal 56a to
_2/2 of the pressing force is transmitted to the die 12, Aru die 12 when more of the coating ends so as to supply compressed air to force retracted to the retracted standby position (see FIG. 5).

The resultant force P ₂ of the output of the air cylinder 56, as shown in FIG. 7, the coating liquid B ₂ of the coating solution reservoir B ₂ -1 formed in the coating liquid reservoir space S ₂ of wedge balance the resultant force P ₁ of the pressing force for pressing the lip surface 16 of the die 12. If the substrate A has a thickness, the die 12 moves following the thickness of the substrate A. The reason to follow is Die 1
2 are arranged so as to be able to move away from and move toward the substrate transport path R, and move the die 12 at the output ends 56a and 56a of the pressing means 55 which moves in the direction of the die approach and release movement. , And the pressing forces P ₁ and P ₂ are balanced. Since the die 12 follows, the die 1
Exit edge 16a of lip surface 16 (15) of 2 (11)
The gap dimension W _1-2 (W ₁ ) of the coating film forming gap E ₂ (E ₁ ) formed between (15a) and the substrate surface Aa (Aa).
-1) would be maintained at a constant value, the coating film B ₁ -2 (B ₂ -2 constant on the surface Aa (Aa) of the base material A thickness W ₂ -1 (W ₂ -2) ) Is always formed.

The base material A and the lip surface 1 depend on the thickness of the base material A.
When the coating liquid storage spaces S ₁ and S ₂ formed between the first die 1 and the second die 16 change, as shown in FIG.
1 at a predetermined coating position, and the other die 12
The two-sided simultaneous coating with a uniform coating film thickness can be performed by arranging them so as to be able to move toward and away from each other and pressing them toward the transport path R by the pressing means 55. That indicates when the base material A becomes thinner, as shown in FIG. 7, the coating solution reservoir B ₁ -1 by thickening the coating liquid reservoir space S _1, S _2, a tendency to reduce the internal pressure of the B ₂ -1 Is a die 12 receiving a constant pressing force of the pressing means 55.
Is the direction in which the coating liquid storage spaces S ₁ and S ₂ are made thinner, the pressing force of the lip surfaces 15 and 16 and the coating liquid storages B ₁ -1 and B ₂ -1.
Move forward to a position where is balanced. Conversely, when the base material A becomes thicker, the coating liquid storage spaces S ₁ and S ₂ are made thinner and the coating liquid storage B ₁ −
1, B ₂ shows the internal pressure tends to increase the -1, die 12 undergoing constant pressing force of the pressing means 55, and the lip surface 15 in a direction to increase the coating liquid reservoir space S _1, S ₂ , 1
6 pressing force and Nurikoekitamari B ₁ -1 of, and B ₂ -1 to a retracted position to which balanced. As a result, the movable die 12 pressed and pressed by the pressing means 55 can move the thickness of the coating liquid storage spaces S ₁ and S ₂ and the gap dimension W ₁ − of the coating film forming gaps E ₁ and E _2.
1, W _1-2 is a constant value, and both surfaces Aa, Aa
Constant thickness W ₂ -1, W ₂ -2 of the coating film B ₁ -2 to, B ₂
-2 is always formed.

[0017]

EFFECTS OF THE INVENTION The apparatus of the present invention enables a simultaneous coating on both sides with a high-viscosity coating liquid, which was previously impossible, so that the viscosity selection range of the coating liquid ranges from low to high. Can be The apparatus of the present invention provides a coating liquid storage space formed between a base material surface and both lip surfaces and
Make each of the coating film forming gaps face each other via the base material
Therefore , the substrate surface does not come into contact with the lip surface. As a result, the apparatus of the present invention enables long-time coating without damaging the lip surface finished with high precision, and has the effect of dramatically improving the operating efficiency of the coating equipment.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the device of the present invention,
The side view which carried out the partial cross section which shows a die and a drying apparatus.

FIG. 2 is an enlarged side sectional view showing the vicinity of a die tip in a coating state according to the first embodiment.

FIG. 3 is a front view showing the entire apparatus of the first embodiment.

FIG. 4 is a side sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a side sectional view showing a double-sided simultaneous coating apparatus according to a second embodiment related to the apparatus of the present invention, in which a die is in a standby state.

FIGS. 6A and 6B show a second embodiment, in which FIG. 6A is a side sectional view of the die in a standby state, and FIG. 6B is a side sectional view of the die in a coated state.

FIG. 7 shows the second embodiment, and is an enlarged side sectional view showing the vicinity of the tip of a die in a coated state.

FIG. 8 is a side view showing a conventional simultaneous coating apparatus.

[Explanation of symbols]

11 (12): die, 13 (14): coating liquid extrusion slit, 15 (16): lip surface, 15a (16a): outlet edge, S ₁ (S ₂ ): coating liquid storage space, E ₁ (E ₂ ): Coating film formation gap, R: Substrate transport path

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B05C 5/00-5/04 B05C 9/04 B05C 11/04

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein two dies facing each other via a base material transfer path are arranged so as to be stopped at a predetermined coating position.
A coating liquid extruding slit extending along the direction traversing the transport path, and a coating portion facing the local portion of the transport path located on the substrate discharge side from the coating liquid extruding slit and between the local portion and the local portion; With a lip surface forming a liquid storage space, a coating film forming gap is formed between the exit edge of the lip surface and the transport path, and when both dies stop at the predetermined coating position, Stop
Rukoto allowed to the lip surface each other are opposed to each other via the conveying path
The coating liquid reservoir space formed by both lip surfaces
Each of the coating film forming gaps faces each other via the conveyance path.
A double-sided simultaneous coating device, characterized in that 2. The double-sided simultaneous coating apparatus according to claim 1, wherein the coating liquid extrusion slit is opened at an entrance edge of the lip surface.