JP3893915B2 - Roll coat equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll coater that supplies a liquid coating material to a material to be coated while being spread thinly and uniformly through a roll and applies the coating material to the material to be coated.
[0002]
[Prior art]
In a roll coater (roll coater) for supplying and applying a liquid coating material to a coated material such as a plate material while spreading it thinly and uniformly through a roll, as a method of supplying the coating material to the roll, There are a pickup roll system (bottom feed type) shown in FIG. 5 and an inter-roll supply system (top feed type) shown in FIG. In this pickup roll method, as shown in FIG. 5, the coating material 1 in the tank 2 is scooped up by the pick-up roll 3, and the scooped up coating material 1 is transferred to the applicator roll 4. The film thickness of the coating material 1 is adjusted and applied to the material 6 to be coated. Reference numeral 7 in FIG. 5 denotes a backup roll, reference numeral 8 denotes a cleaning doctor that scrapes the coating material 1 from the surface of the metering roll 5, and reference numeral 9 denotes an excessive coating material 1 on the surface of the pickup roll 3. Edge doctor to be removed. However, this pickup roll system has a problem that the coating material pulsates in the tank 2 when the viscosity of the coating material is high or the pickup roll 3 rotates at a high speed, making it impossible to supply a uniform coating material. Further, a state occurs in which solid components are separated in the tank 2 and the supply of the coating material at the pickup roll 3 is not stable.
[0003]
In addition, as shown in FIG. 6, the inter-roll supply system supplies the coating material 1 directly between the metering roll 5 and the applicator roll 4, and transports the coating material 1 with the applicator roll 4. It is applied to the coating material 6. However, even in this method, the coating material 1 can flow in the rotation direction of the roll and has a stirring effect. However, when a coating material with a large amount of solid components such as a liquid flux is used as the coating material, the solid components are separated. However, there is a problem that stirring cannot be performed sufficiently.
[0004]
Further, as shown in FIG. 7, in the case of stripe coating in which the pattern roll 10 is added to the inter-roll supply system of FIG. 6, the coating material 1 is stored between the metalling roll 5 and the gate roll 11, A coating film of a coating material having a thickness adjusted in the gap is formed on the metalling roll 5, this coating film is transferred to the surface of the pattern roll 10, and the coating film transferred onto this pattern roll 10 is covered. Application is performed by transferring to the surface of the application material. However, in the case of this stripe coating, as shown in FIG. 8, the supply of the coating material to the metalling roll 5 is only to the stripe portion, and a part of the coating material reservoir portion between the metalling roll 5 and the gate roll 11 is provided. Only the coating material is consumed, and a level difference occurs between the consumed part and the non-consumed part in the liquid surface of the reservoir, and the coating material flows from both sides toward the consumed stripe part. There is a problem that a difference in supply of solid components occurs in the shape of the pattern roll in the portion, and scaly application unevenness occurs on the surface of the pattern roll 10 and the application portion of the material to be coated.
[0005]
[Problems to be solved by the invention]
The present invention is made by paying attention to the flow of the coating material between the rolls in the stripe coating by the inter-roll supply system of the coating material, and the purpose thereof is to scour the precipitation of the solid component in the coating material. It lifts upwards and stirs reliably, eliminates the difference in supply of solid components caused by the pattern roll shape as in stripe coating, eliminates uneven coating on the surface of the pattern roll, and stably coats the coated material without unevenness. It is possible to provide a roll coater capable of applying a uniform film thickness.
[0006]
[Means for Solving the Problems]
The present invention provides a roll coater according to each of the claims as means for solving the problems.
In the roll coater according to claim 1, the coating material is a liquid flux, the first roll and the second roll have the same rotation direction, and the rotation direction of the third roll and the feed of the coated material The dam is formed by two weirs constructed between the first roll and the second roll, and the coating material supply section is provided on one end side of the dam, and the other end side. from the overflow opening kicked set in dam providing a coating material collecting portion for collecting the coating material, while flowing a coating material to the coating material collecting portion side in the rotation perpendicular direction of the roll from the coating material supply unit side, the The coating material is applied to the coating material, which makes it possible to use the liquid flux with many solid components as the coating material, and even if the consumption of the coating material is only the stripe part, the coating material liquid surface in the dam In the dam of the coating material applied to the first roll without any step Les stable in one direction, the film thickness is so stable and uniform coating material is applied. In addition, by adopting a reverse method in which the rotation direction of the third roll and the feeding direction of the coated material are reversed, the coating material on the third roll surface is rubbed against the coated material, It is possible to prevent the coating film from being interrupted and the film thickness from changing.
[0007]
The roll coating apparatus according to claim 2 is configured such that the rotation directions of the first, second, and third rolls are all the same direction, whereby the second roll is also used for the first roll. For the third roll, the first roll serves as a doctor (removal of excessive coating material and adjustment of film thickness), and the accuracy of the coating film thickness of the coating material is improved .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a roll coater according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of the roll coater of the present invention, and FIG. 2 is a plan view thereof. The roll coater 101 of the present invention includes three rolls: a metering roll 102 that is a first roll, a gate roll 103 that is a second roll, and a pattern roll 104 that is a third roll. These three rolls are arranged horizontally and rotate in the same direction.
[0009]
Weirs 105a and 105b are installed between the side surface of the metalling roll 102 and the side surface of the gate roll 103, which form a thin and uniform coating material 100 film on the surface. A dam 105 that is a reservoir of 100 is formed.
The pattern roll 104 is a roll that transfers the coating film from the metering roll 102 having the coating material 100 film formed on the surface thereof, and transfers the coating film to the coating material 109 in a stripe shape. The plate is formed by being fitted to the shaft at a predetermined interval. This shape forms a coating film having a stripe pattern on the material 109 to be coated.
The rotation direction of the pattern roll 104 and the feeding direction of the material to be coated 109 are opposite to each other by adopting a reverse method, and the coating material 100 on the surface of the pattern roll 104 is rubbed against the material to be coated 109 and the coating film is interrupted. The film thickness is not changed, and the coating film on the material to be coated is made uniform with the coating material 100 having a large amount of solid components.
[0010]
A coating material supply unit 106 is provided on one end side of the dam 105, which is one of the features of the present invention, and a coating material recovery unit 107 is provided on the other end side of the dam 105. In FIG. 5, the coating material 100 is recovered to the coating material recovery unit 107 from the overflow opening 105 c provided in the weir 105 b on the other end side of the dam 105. Thereby, in the dam 105 of the coating material pool, the coating material spirals by a flow in two directions, a flow in the roll rotation direction and a flow in a direction perpendicular to the roll rotation (axial direction of the roll) as shown in FIG. A flow is formed, and as will be described later, solid components in the coating material 100 can be stirred and stably supplied to the pattern roll 104.
[0011]
The gate roll 103 is provided with a cleaning doctor 8 to scrape the coating material 100 on the surface of the gate roll 103. The coating material 100 is supplied to the metering roll 102 only from the gap between the metalling roll 102 and the gate roll 103, and the coating material supply amount is the difference in rotational speed between the metalling roll 102 and the gate roll 103, and pressing. It is adjusted according to the amount.
[0012]
FIG. 3 is a diagram for explaining the separation elimination action of the solid component of the coating material in the present invention. In the present invention, the metering roll 102 and the gate roll 103 are horizontally arranged and have the same rotation direction. Therefore, the metering roll 102 and the gate roll 103 are rotated opposite to each other, and the flow of the roll rotation direction and the solid component in the coating material 100 between the rolls are scraped upward in the coating material reservoir in the dam 105. A flow of frying is formed, stirring is performed reliably, and separation of solid components is eliminated, and the coating material 100 can be supplied uniformly.
[0013]
FIG. 4 is a diagram for explaining the stable supply action of the coating material to the stripe portion in the present invention. In the present invention, the flow in the direction perpendicular to the roll rotation (the axial direction of the roll) and the roll from the coating material supply unit 106 on one end side of the dam 105 that is a coating material reservoir to the coating material recovery unit 107 on the other end side. A flow in the rotation direction is generated, and a spiral flow of the coating material 100 as shown in FIG. 2 is generated by this two-way flow. Therefore, the coating material 100 in the dam 105 flows in a certain direction (from the coating material supply side to the coating material recovery side), preventing the coating material 100 other than the stripe portion from staying in the dam 105, The coating material 100 is supplied sufficiently stably.
[0014]
Next, the operation of the roll coater of the present invention will be described.
First, the coating material 100 is stored in the dam 105 between the metal ring roll 102 and the gate roll 103, and the metal ring roll 102 and the gate roll 103 are rotated in the direction of the arrow as shown in FIG. A film of the coating material 100 is formed on the surface of the metering roll 102 by the gap therebetween. Next, the coating material 100 film on the surface of the metalling roll 102 is transferred to the pattern roll 104 from the metalling roll 102 in a stripe pattern by the rotating pattern roll 104.
On the other hand, the pattern roll 104 to which the coating material 100 has been transferred transfers the coating material 100 to the material to be coated 109 and applies the coating material to the material to be coated 109.
[0015]
At this time, all the rolls 102, 103, 104 have the same rotation direction, and the rotation direction of the pattern roll 104 and the movement direction of the material to be coated 109 are reversed, so that the applied coating material 100 is interrupted. It becomes possible to apply without.
In addition, since the coating material film is formed again by passing the dam 105 on the surface of the metalling roll 102 from which the coating material has been transferred in a stripe shape, the coating material 100 in the dam 105 has only the stripe portion. Since it is consumed and reduced, the flow of the coating material 100 toward the stripe portion is generated in the dam 105, and in the case of a coating material having poor fluidity such as a liquid flux, the influence of this flow causes the coating material 100 to flow on the film surface. Striped pattern (unevenness) occurs. In the present invention, in order to solve this problem, the coating material supply unit 106 is provided at one end of the dam 105, the coating material recovery unit 107 is provided at the other end of the dam 105, and the coating material 100 in the dam 105 is placed in a certain direction. The coating material 100 other than the stripe portion is prevented from staying in the dam 105, and the coating material 100 is sufficiently supplied to the stripe portion.
[0016]
As described above, in the present embodiment, the stripe coating is described with an example in particular. However, the roll coating apparatus of the present invention can be applied to a coating material having a large amount of solid components regardless of the presence or absence of the pattern roll and the number of steps. Can be agitated, and the coating has an excellent advantage that uneven coating can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an overall configuration of a roll coater according to an embodiment of the present invention.
FIG. 2 is a plan view of the roll coater of FIG.
FIG. 3 is a diagram for explaining the separation elimination action of solid components of a coating material in a dam that is a coating material reservoir.
FIG. 4 is a view for explaining the stable supply operation of the coating material from the dam to the stripe portion.
FIG. 5 is a diagram illustrating the supply of a coating material by a known pickup roll method.
FIG. 6 is a diagram illustrating the supply of a coating material by a known inter-roll supply method.
FIG. 7 is a schematic configuration diagram of a conventional stripe coating roll coater.
FIG. 8 is a view for explaining the supply operation of the coating material from the dam to the stripe portion in the conventional stripe coating roll coater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... Coating material 101 ... Roll coating apparatus 102 ... Metalling roll (1st roll)
103. Gate roll (second roll)
104 ... Pattern roll (third roll)
105 ... Dam 106 ... Coating material supply unit 107 ... Coating material recovery unit 108 ... Cleaning doctor 109 ... Material to be coated

Claims (2)

Three rolls of a first roll, a second roll, and a third roll are provided, and a coating material is stored in a dam provided between the first roll and the second roll. A coating film having a thickness adjusted by a gap with the second roll is formed on the surface of the first roll, and the coating film on the surface of the first roll is transferred to the surface of the third roll in a stripe shape. Furthermore, in the roll coater for applying the coating material to the material to be coated by transferring the coating film on the surface of the third roll to the surface of the material to be coated in a stripe shape,
The coating material is a liquid flux, the first roll and the second roll have the same rotation direction, and the rotation direction of the third roll and the feeding direction of the coated material are opposite to each other. And the dam is formed by two weirs constructed between the first roll and the second roll, and a coating material supply portion is provided at one end of the dam, and the other end of the dam. A coating material recovery unit that recovers coating material from an overflow opening provided in the weir is provided on the side, and the coating material flows in a direction perpendicular to the rotation of the roll from the coating material supply unit side to the coating material recovery unit side. A roll coater characterized by applying a coating material to a material to be coated.   The roll coater according to claim 1, wherein the first roll, the second roll, and the third roll have the same rotational direction.

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