JPH1190297A - Die coater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die coater capable of further reducing defects of coating by appropriately setting a gap between a lip for discharging a coating material and the metal web at the start of coating application operation in a die coater wherein continuous coating application operation is carried out on a surface of a metal web while the metal web is being conveyed. SOLUTION: Dies 6 having a coating material discharge lip 64c provided at a front edge part, a backup roll 2 supporting a metal web W, a horizontal movement mechanism F of the dies 6 and a controller 5 for controlling the horizontal movement mechanism, and a passage 43 for supplying the coating material is provided with a pressure detecting means 44 for detecting supply pressure of the coating material. The controller 5 makes the dies move horizontally on the basis of pressure detected by the pressure detecting means 44 at a start of coating application operation so that a gap between the lip 64c and the metal web W is set at a specified clearance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die coater, and more particularly, to a die coater for continuously coating a surface of a metal web while conveying the same, and a lip for discharging paint at the start of a coating operation. The present invention relates to a die coater capable of setting a gap between a metal web and a metal web accurately and further reducing coating defects.

[0002]

2. Description of the Related Art A die coater includes a die provided with a lip for discharging paint at a front edge thereof, and a backup roll which is disposed substantially opposite to the lip and supports the web from the back side. This is a device for continuous coating on the web surface on a roll.

[0003] The present applicant has previously filed a patent application for a novel technique relating to the above-described die coater, mainly as a die coater for continuously coating a metal web. For example, a die coater provided with a die whose coating width can be easily adjusted without disassembling the die (JP-A-6-198240), and a die coater capable of easily changing the paint without disassembling the die Die coater (JP-A-6-47334).

[0004]

In the above-mentioned die coater, the gap between the lip and the metal web must be properly set so that a good coating is formed while observing the state of the coating on the surface of the metal web. Must. Therefore, when the coating operation is started by switching the metal web lot, changing the coating width or the coating, etc., during the gap adjustment, a coating failure state such as peeling or flow of the coating occurs. And the site | part of such poor coating may reach several hundred meters depending on the conveyance speed of a metal web.

The present invention has been made in view of the above circumstances, and has as its object to provide a die coater for continuously coating a surface of a metal web while transporting the metal web. An object of the present invention is to provide a die coater capable of setting a gap between a lip to be discharged and a metal web accurately and further reducing coating defects.

[0006]

In order to solve the above-mentioned problems, a die coater according to the present invention is a die coater for continuously coating a surface of a metal web while conveying the metal web. A die with a lip on the leading edge,
A backup roll arranged substantially opposite to the lip and supporting a metal web from the back, a horizontal movement mechanism for horizontally moving the die, and a control device for controlling the operation of the horizontal movement mechanism; and In the flow path for supplying the paint to the die, a pressure detecting means for detecting the supply pressure of the paint is provided, and the control device is configured to reduce the pressure detected by the pressure detecting means when starting the coating operation. And a function of setting the gap between the lip and the metal web at a predetermined interval based on the horizontal movement of the die.

In the above die coater, the pressure detecting means detects the supply pressure of the paint in the paint supply flow path, and the control device determines the gap between the lip and the metal web based on the detected paint pressure. The position of the die is specified so as to be the interval.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a die coater according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing a control function in the die coater of the present invention. FIG. 2 is a side view showing main members of the die coater, and FIG. 3 is a front view showing the structure of the die from the lip side.

As shown in FIG. 2, the die coater of the present invention
This is a device for continuously coating the surface of a metal web (W) while conveying it, and is configured using a frame (1) formed in a substantially box shape. The illustrated apparatus includes a die (6) provided with a paint discharge lip (64c) at a front edge thereof along a longitudinal direction, and a metal web (W) arranged on a rear surface substantially opposite to the lip (64c). A backup roll (2) supported from above, a horizontal movement mechanism (F) for horizontally moving the die (6), and a control device (5) (see FIG. 1) for controlling the operation of the horizontal movement mechanism. .

In the present invention, examples of the metal web (W) include a thin plate of aluminum, stainless steel, steel, plated steel, etc.
It is about 1 mm. On the other hand, examples of the paint include a clear paint containing a fluorine resin or a polyester resin as a component, a metallic paint containing an aluminum powder or a brass powder as a metallic pigment, and an acrylic resin or an alkyd resin as a vehicle resin component. .

As shown in FIG. 2, the die (6) has a die body (6a) substantially forming a paint flow path and a wide support block (6) for supporting the die body from the rear end side. 6b). As shown in FIG. 3, the die body (6a) is constituted by upper and lower dies (61, 61). A manifold (63) is formed inside the die body (6a) along the longitudinal direction. Between the upper and lower molds (61, 61), that is, the upper and lower molds (61, 6).
Between the separation surfaces on the front side of 1), a manifold (63)
And a slot (64) continuous with the die body (6a).
A lip (64c) is provided as a paint discharge port forming an opening of the slot (64).

In the die body (6a), a pair of thin deckles (93, 93) are usually interposed in the slot (64) in a liquid-tight manner in order to adjust the coating width. Each deckle (93) is a manifold (63)
It is provided at the tip of a pipe-shaped deckle shaft (92, 92) movably inserted from both ends, and the coating width for the metal web (W) is accompanied by the movement of the deckle shaft (92). It is adjusted by changing the distance between each deckle (93).

As shown in FIG. 1, the paint used for coating is taken out of the paint container (40) by pumps (41, 42) and passed through a paint supply flow path (43) composed of a flexible tube or the like. It is supplied to the die body (6a). The supplied paint is the die body (6a) shown in FIG.
Of the lip (6) through a slot (64) defined by each deckle (93) via a deckle shaft (92).
4c).

In FIG. 1, a pump (41) is a self-priming diaphragm pump, and a pump (42) is a constant capacity rotary pump. Thus, two pumps (41, 4)
By disposing 2), the supply flow rate of the paint to the die body (6a) can be further stabilized. In addition,
In the die body (6a), the deckle shaft (9
A mechanism for changing paint (color change) by inserting a paint blocking pig in a liquid-tight and slidable manner into the pipe of 2) and selectively blocking any of the deckle shafts (92). It may be.

In FIG. 2, as a backup roll (2) for supporting a metal web (W), a metal roll having higher hardness than the metal web (W) is usually used. The backup roll (2) is horizontally supported on the upper part of the frame (1), and is arranged parallel and parallel to the lip (64c). Such a backup roll (2) also functions as a transport roll of a transport line for the metal web (W).

In the lower portion of the frame (1) on the upstream side of the backup roll (2), the feeding angle of the metal web (W) to the backup roll is defined, and the entrainment of air during coating is prevented. The upstream tension roll (3) is horizontally supported. Another function of the upstream tension roll (3) is to shape the side edge of the metal web (W) transferred to the backup roll (2) and prevent the metal web (W) from floating.

Further, on the upper part of the frame (1) on the downstream side of the backup roll (2), the take-up angle of the metal web (W) from the backup roll (2) is defined, and the flow of the paint immediately after coating is defined. A downstream tension roll (not shown) for regulating the pressure is provided horizontally. Another function of the downstream-side tension roll is a function of preventing the metal web (W) from floating on the backup roll (2), similarly to the upstream-side tension roll (3).

In the die coater of the present invention, the horizontal moving mechanism (F) is provided with a gap between the lip (64c) and the metal web (W) on the backup roll (2), that is,
It is provided for adjusting a separation distance (hereinafter, abbreviated as “gap”) from the lip (64c) to the metal web (W). Further, in the die coater according to the present invention, in order to adjust the gap with higher precision and speed, the horizontal movement mechanism (F) includes a horizontal coarse movement mechanism for adjusting the die (6) in a large range, and a fine range. And a horizontal fine movement mechanism which is adjusted by the above. In addition, by using such a horizontal moving mechanism (F), the die (6) can be retracted to avoid the connection portion of the metal web (W), and the foreign material attached to the surface of the metal web (W) can be avoided. Can also be done quickly.

The horizontal coarse movement mechanism is configured as a movement mechanism of the movement base (7). Specifically, die base (8)
In addition, the moving base (7) on which the die (6) is mounted is mounted via a linear guide (12) on a horizontal frame (11) extended from the frame (1). Then, the moving base (7) is moved up and down by a cylinder device (73) (only the cylinder rod is shown in FIG. 2) attached to the horizontal frame (11) side, and together with the die base (8) and the die (6), a backup roll is formed. It is relatively movable at a relatively high speed in the direction of approaching / separating from (2), for example, at a speed of about 5 to 50 cm / sec, and is movable within a predetermined range.

The range of movement of the die (6) by the horizontal coarse movement mechanism is such that the separation distance from the lip (46c) to the vertical tangent to the surface of the backup roll (2) on the die (6) side is -10.
The range is about 0 to 1500 mm. The minus of the separation distance means a state in which the tip of the lip (64c) is located closer to the backup roll than the tangent to the surface of the backup roll (2), and may be set in a coating operation by offset.

The horizontal fine movement mechanism is configured as a mechanism for moving the die (6) on the die base (8). Specifically, the die body (6a) and the support block (6b) of the die (6) each have a common die base (8).
It is mounted on the upper side via a linear guide (82). The die (6) is movable in the direction of approaching and separating from the backup roll (2) by the reciprocation of the cylinder device (83) attached to the die base (8).

Further, the first half of the die base (8) on the side of the backup roll (2) has a tower structure in which a support (80) is erected upward, and a die body (6a) of the die (6).
Is placed in a state inserted inside the column (80). In addition, the side surface of the support (80) opposite to the backup roll (2) is formed on an inclined surface inclined toward the backup roll (2), and between the support (80) and the wide support block (6b). A cotter (85) having one side surface formed at the same inclination angle as the above-described inclined surface is inserted into the cotter.

The cotter (85) is suspended by a screw bar (86) extending vertically downward from a horizontal beam (81) at the upper end of the column (80). Screw bar (86)
Is rotated by a servomotor attached to the beam (81), and the cotter (85) is rotated by a screw bar (8).
It is configured to move up and down by the rotation of 6). That is, the die (6) is pressed against the support (80) side of the die base (8) via the cotter (85) by the retreat of the cylinder device (83), and the most advanced position on the die base (8) is defined. In addition, by moving up and down the cotter (85), the cotter (85) moves in a direction of approaching and separating from the backup roll (2) in a range of about 0.001 to 5 mm and 0.01.
It is configured to be movable at a speed of about 0.1 mm / min.

In the die coater of the present invention, the die (6) may be configured to be able to move up and down in order to switch between the opposite coating and the opposite coating. Specifically, the moving base (7) is configured by standing up a frame (71) substantially vertically at the front edge of a horizontal flat base, and the die base (8) is arranged along the frame (71). To the linear guide (72) attached vertically. That is, the die base (8) is configured to be able to move up and down together with the die (6) by expansion and contraction of a jack (84) provided on the bottom surface side. The horizontal movement mechanism (F) including the jack (84) is controlled by the control device (5) such as a program controller including a separately provided storage operation unit.

By the way, at the start of the coating operation, it is necessary to set an appropriate gap as quickly as possible.
That is, when the gap is narrow with respect to the paint discharge pressure from the lip (64c), the paint drips and the coating film becomes thin, while when the gap is wide with respect to the paint discharge pressure, the paint is applied. This is because unevenness and coating breakage occur, and in any case, coating failure occurs.

On the other hand, the discharge pressure of the paint from the lip (64c) is substantially proportional to the supply pressure of the paint in the flow path (43), and the supply pressure depends on the gap distance of the slot (64) and the coating width. And coating thickness, coating speed (metal web (W)
It must be determined according to the supply amount of the paint, the paint viscosity, and the like based on the transfer speed of the paint. However, the supply pressure of the paint to the die (6) was
There is the fact that it depends on the ability of 2) and it is difficult to finely adjust it. In addition, the supply pressure varies depending on the type of paint, in other words, the viscosity of the paint.

Therefore, in the die coater of the present invention,
In order to further reduce coating defects, a pressure detecting means (44) for detecting a paint supply pressure is provided at the paint supply flow path (43) leading to the die, that is, at the inlet side of the die body (6a). Can be As the pressure detecting means (44), 0
A pressure gauge of a Bourdon tube type or the like having a measurement range of about 100 kgf / m ² and capable of outputting a signal is used. When the coating operation is started, for example, at the time of starting the die coater or at the time of restarting due to the change of the coating condition, the control device (5) detects the pressure (pressure signal) detected by the pressure detecting means (44). The die (6) is horizontally moved based on the lip (6
4c) and a function of setting a gap between the metal web (W) and the metal web (W) at a predetermined interval.

More specifically, the control device (5) controls the thickness of the metal web (W), the type of the paint (viscosity), the coating width, the thickness of the coating film, the coating speed, etc., which affect the gap. Is set, the horizontal movement mechanism (F) is controlled based on the detected supply pressure of the paint so as to have a constant gap. That is, the control device (5) finds in advance the predetermined coating conditions such as the thickness of the metal web (W), the type of the coating, the coating width, the coating thickness, and the coating speed. Flow path (43)
The relationship between the pressure and the appropriate gap is stored as control data, and at the start of the coating operation, the control data is compared with the detected supply pressure data,
The driving of the horizontal moving mechanism (F) is controlled. The gap is determined by detecting the positions of the support block (6b) and the die base (8) in the horizontal movement mechanism (F), and by using these reference positions and the movement amount and the thickness of the metal web (W), the control device ( It can be easily detected using the calculation function of 5).

In the die coater of the present invention, as shown in FIG. 1, a metal web (W) is sequentially wound around an upstream tension roll (3), a backup roll (2), and a downstream tension roll (not shown). By turning, a pass line is formed. In the case of a coating operation using an opposite, the die (6) that can move up and down is positioned such that the discharge direction of the coating material from the lip (64c) is substantially along the horizontal diameter of the backup roll (2). In the case of operation, the discharge direction of the paint from the lip (64c) is located out of the horizontal diameter of the backup roll (2). The die body (6a) is a metal web (W) conveyed on the backup roll (2) at a constant speed.
Is applied from the lip (64c) at a constant flow rate.

At the start of coating, pressure detecting means (44)
Detects the paint supply pressure in the paint supply flow path (43). Then, based on the detected pressure, the control device (5) regulates the position of the die so that the gap is at a predetermined interval. That is, the control device (5) compares the detected pressure with the above-mentioned coating conditions such as the thickness of the metal web (W) and the type of the paint which are set in advance at the time of starting, and stores an appropriate pre-stored appropriate value. The horizontal movement mechanism (F) is controlled based on the relationship between the gap amounts.

At this time, the horizontal coarse moving mechanism of the horizontal moving mechanism (F) moves the die (6) in a large range and at a high speed by moving the moving base (7) forward and backward.
By pressing the die (6) toward the forward side and moving the cotter (85) up and down, the die (6) is moved in a much smaller range. As a result, for example, the gap is set with high precision and quickly to 0.01 to 1.0 mm in the case of the coating operation by the opposite, and to -5 to 1 mm in the case of the coating operation by the offset.

In other words, the die coater of the present invention can immediately define the position of the die (6) at the start of coating and can set the gap properly, so that coating defects can be further reduced. As a result, for example, the coating failure of the metal web (W) at the time of startup, which has conventionally been several hundred meters, can be reduced to several tens of meters, and the loss of the material such as the metal web (W) and paint is extremely small. You can do it. In the die coater of the present invention, the horizontal movement mechanism of the die is not limited to a mechanism using a cylinder device or a cotter, but may employ an appropriate movement mechanism such as a mechanism operated by a servomotor via a gear.

[0033]

As described above, according to the die coater of the present invention, at the start of coating, the position of the die can be defined immediately, and the gap between the lip and the metal web can be set accurately. The loss can be further reduced, and as a result, the loss of materials such as metal webs and paints can be extremely reduced.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a control function in a die coater of the present invention.

FIG. 2 is a side view showing main members of the die coater.

FIG. 3 is a front view showing the structure of the die from the lip side.

[Explanation of symbols]

 1: frame 12: linear guide 2: backup roll 40: paint container 43: paint supply flow path 44: pressure detecting means 5: control device 6: die 6a: die body 6b: support block 64: slot 64c: lip 7 : Moving base 72: Linear guide 8: Die base 82: Linear guide 84: Jack 85: Cotter F: Horizontal moving mechanism W: Metal web

Claims (1)

[Claims] 1. A die coater for continuously coating a surface of a metal web while transporting the metal web. The die coater has a lip for paint discharge provided at a front edge thereof in a longitudinal direction, and a die coater substantially facing the lip. A backup roll arranged and supporting the metal web from the back, a horizontal movement mechanism for horizontally moving the die, and a control device for controlling the operation of the horizontal movement mechanism, and for supplying paint to reach the die The flow path is provided with pressure detecting means for detecting a supply pressure of the paint, and the control device horizontally moves the die based on the pressure detected by the pressure detecting means when starting a coating operation. A die coater having a function of setting a gap between the lip and the metal web at a predetermined interval.