JPH11226470A - Multi-layer coating method, method for producing pressure-sensitive adhesive tape, and die for multi-layer coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer coating method for efficiently performing multilayer coating, a method for producing a pressure-sensitive adhesive tape, and a die for multilayer coating. SOLUTION: An outlet 9 and an inlet 7 are arranged in a state of being twisted at substantially right angles. The flow path 8 communicating the discharge port 9 and the injection port 7 is formed so as to change from the shape of the injection port 7 to the shape of the discharge port 9 without changing the cross-sectional area thereof. The coating agents A to E injected into the injection port 7 in a line are aligned with the discharge ports 9 while adjusting the cross-sectional shape of the coating agents A to E as shown in the cross sections 20 to 25 as a whole. Flows towards The multilayer coating die having such a structure performs multilayer coating by discharging five types of coating agents onto the substrate in a multilayered manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer coating method and a method for producing a pressure-sensitive adhesive tape, in which at least one kind of pressure-sensitive adhesive is applied on a substrate such as a sheet or a film in a multilayer manner. And a multilayer coating die.

[0002]

2. Description of the Related Art In recent years, for example, in order to impart functionality to an adhesive tape, a pressure-sensitive adhesive and a coating agent having other functionalities (for example, buffering properties) are applied in a multilayered form on a tape base material. Has been implemented. In order to apply two or more kinds of coating agents, at least one kind of which is an adhesive, on a substrate in a multilayered manner, the following method is employed. First, a different kind of coating agent is applied on a substrate and dried. In the same manner, another kind of coating agent is further applied on the previous coating agent and dried. After repeatedly applying and drying each of these different types of coating agents, then successively applying and drying the pressure-sensitive adhesive on another type of coating agent, the adhesive and the different type of coating agent are formed into a multilayer. Coating.

[0003]

However, the prior art having such a structure has the following problems. The coating efficiency is poor because the adhesive and the different kinds of coating agents are individually applied, and there is a drawback that the number of coating steps increases as the types of coating agents to be applied increase.

[0004] In order to solve such difficulties,
As disclosed in Japanese Patent Application Laid-Open No. 4-35765, there is a method in which a plurality of discharge ports are provided, and a coating material of each type is discharged from each of the discharge ports to perform multi-layer coating. However, as described above, the coating die provided with the discharge port for each type of the coating agent cannot apply the coating agent in the number of discharge ports or more provided in the coating die in a multilayer shape. Therefore, in such a case, as described above, it is necessary to perform the coating in a plurality of times, and there is a problem that the coating efficiency is low.

The present invention has been made in view of such circumstances, and a multilayer coating method, a method for producing an adhesive tape, and a multilayer coating method capable of efficiently coating a plurality of types of coating agents in a multilayer form. The purpose is to provide a coating die.

[0006]

The present invention has the following configuration in order to achieve the above object. That is, the invention according to claim 1 is a multilayer coating method in which two or more types of coating agents, at least one of which is an adhesive, are coated in a multilayer on a substrate, and a slit-like method for discharging the coating agent is provided. Is disposed such that the longitudinal direction thereof is substantially perpendicular to the direction of travel of the base material, and the injection port into which the coating agent is injected is twisted substantially at right angles to the discharge port. The two or more kinds of coating agents are arranged in a line in the injection port and injected, and the injected coating agent is discharged in a multilayer form from the discharge port, and the adhesive and another type of coating agent are formed on the base material. And multi-layer coating.

According to a second aspect of the present invention, there is provided a method for producing a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive and a different kind of coating material are applied in a multilayered form on a tape base material. The slit-shaped discharge port for discharging the, the longitudinal direction thereof is disposed so as to be substantially perpendicular to the traveling direction of the tape substrate, the injection port is injected with the adhesive and another type of coating agent, the Arranged in a state of being twisted substantially at right angles to the discharge port, injecting the adhesive and another type of coating material in a line in the injection port, and injecting the injected adhesive and another type of coating material into the injection port. It is characterized in that the pressure-sensitive adhesive and another type of coating agent are applied in a multilayer shape on the tape base material by discharging in a multilayer shape from the discharge port.

According to a third aspect of the present invention, there is provided a multilayer coating die for coating a coating material on a substrate in a multilayer shape, wherein the slit-shaped discharge port for discharging the coating material; The injection port, which is twisted substantially at a right angle to the discharge port, has an injection port into which two or more kinds of coating agents are injected in a line, and a flow path communicating from the injection port to the discharge port is formed by the coating method. One side of the inlet in which the agents are arranged in a line is narrowed toward the outlet from the inlet and ends at the short side of the outlet, and the other side of the inlet is the outlet from the inlet. And ends at the long side of the discharge port, and the cross-sectional area of each of the flow path sections from the injection port to the discharge port becomes substantially equal.

[0009]

The operation of the first aspect of the invention is as follows. The two or more kinds of coating agents injected in a state of being arranged in a line are flowed toward the discharge port in a positional relationship that is twisted substantially at right angles to the injection port, while maintaining the order in which the coating agents are arranged, The cross-sectional shape of the entire coating material is changed to the shape of the discharge port. The two or more kinds of coating materials flowing to the discharge port are discharged from the discharge port in a state of being stacked in a multilayer. The base material is subjected to multi-layer coating with two or more kinds of the multi-layer coating agents.

The operation of the invention described in claim 2 is as follows. While maintaining the order in which the adhesive and another kind of coating agent injected in a state of being arranged in a line,
While flowing toward the discharge port which is twisted at a right angle to the injection port, the entire cross-sectional shape of the adhesive and another kind of coating agent is changed to the shape of the discharge port. The adhesive and another kind of coating agent that have flowed to the discharge port are discharged from the discharge port in a state of being stacked in multiple layers. An adhesive tape is manufactured by applying this multilayer adhesive and another kind of coating agent to the tape base material.

The operation of the invention described in claim 3 is as follows. The two or more kinds of coating agents injected in a line in the injection port flow into a flow path communicating with the discharge port. In this flow path, one side of the inlet terminates at the shorter side of the outlet, the other side of the inlet terminates at the longer side of the outlet, and any flow path from the inlet to the outlet. Also in the cross section, since the cross-sectional areas are almost equal, the cross-sectional shape of the entire coating material flowing into this flow path is
It changes to the shape of the discharge port without changing the cross-sectional area. That is, while maintaining the order in which they are arranged in a line, the shape changes from a vertically long sectional shape to a horizontally long sectional shape which is the shape of the discharge port. As a result, the discharge port discharges two or more kinds of coating agents in a multilayer shape, so that the multilayer coating die having the discharge ports applies the multilayer coating to the base material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view showing a schematic configuration of a multilayer coating apparatus including a multilayer coating die 1 according to the present invention. The multilayer coating apparatus includes a backup roll 2 that supports a tape substrate 3 on which multilayer coating is to be performed so that the tape substrate 3 can be conveyed from a back side thereof, and a multilayer coating die 1 that is disposed to face the backup roll 2. And this multi-layer coating die 1
And first to fifth coating agent supply sources 11 to 15 for supplying, for example, five types of coating agents to the respective components. In this example, five types of coating agents are described, but the present invention is not limited to this. For example, the same type or multiple types of coating agents may be used as long as they are coating agents for multilayer coating. It can be applied without being done.

The tape base material 3 holds, in that state, five types of coating agents applied by the multilayer coating die 1 described later, and is made of, for example, paper, cloth, polyethylene terephthalate (PET), or the like. It is a base material for an adhesive tape to be formed, for example. A base material transport mechanism (not shown) is provided on one end side of the tape base material 3, and the tape base material 3 is transported in a direction indicated by a straight line in FIG. . After the multilayer coating is performed by the multilayer coating die 1 described later, the tape base material 3 holding the coated coating agent is transported to the next step, for example, a drying step.

The backup roll 2 is configured to be rotatable by a bearing or the like (not shown). The backup roll 2 rotates, for example, in the direction of an arrow in accordance with the transport of the tape substrate 3, and also has a coating surface side of the tape substrate 3, which is described later. The tape base material 3 is supported from the back side so that the distance between the tape base material 3 and the discharge port 9 provided in the multilayer coating die 1 is kept constant.

The multilayer coating die 1 is arranged such that the longitudinal direction of a slit-like discharge port 9 provided on the surface facing the backup roll 2 is orthogonal to the direction of travel of the tape base material 3. For example, five kinds of coating agents, which are arranged in a line from the inlet 7 and are injected, are discharged in a multilayer form from the discharge port 9 to apply a multilayer coating to the tape base material 3.

The structure of the multilayer coating die 1 according to this embodiment will be described with reference to an exploded perspective view shown in FIG. The multilayer coating die 1 includes a lower die 4 positioned on the upper side with respect to the traveling direction of the tape substrate 3 and a lower die 5 positioned on the lower side with respect to the traveling direction of the tape substrate 3. And a connecting member 6 for connecting the dies 4 and 5 to each other.

The connecting member 6 is provided with a supply pipe connecting portion 6a for arranging five supply pipes (see FIG. 1) communicating with the respective coating material supply sources 11 to 15 described later in a line. I have. The supply pipe connecting portion 6a is formed by drilling five connection holes in a line in order to connect and connect five supply pipes. Also, a good die 4 to be described later.
In order to connect and fix the lower die 5 and the lower die 5, four bolt holes 6b into which bolts (not shown) are inserted are provided.

On the upper die 4, two tap holes 4 a into which the bolts inserted into the bolt holes 6 b of the connecting member 6 are screwed are provided on the mating surface 8 b with the connecting member 6. Further, a narrow groove 7a is formed substantially at the center of the abutting surface 8b on the side of the abutting surface 8a with the lower die 5. The narrow groove 7a is formed along the abutting surface 8b so as to increase the width of the groove and decrease the depth of the groove toward the opposite surface of the abutting surface 8b. Has a wide groove 9a. Further, a plurality of bolt holes 4b into which six bolts M are inserted are provided in the butting surface 8a.

The lower die 5 is configured substantially symmetrically with the upper die 4. That is, two tap holes 5a into which the bolts inserted into the bolt holes 6b of the connecting member 6 are screwed are provided in the butting surface 10b of the lower die 5 with the connecting member 6. A narrow groove 7b is formed in the butting surface 10a of the lower die 5 with the upper die 4 so as to terminate at the wide groove 9b, and a bolt inserted into the bolt hole 4b of the upper die 4 is formed. Six tap holes 5b into which M is screwed are provided.

The abutting surface 8a of the upper die 4 and the abutting surface 10a of the lower die 5 abut each other, and the six bolts M are screwed into the tap holes 5b through the bolt holes 4b, so that the upper die 4 is screwed. Side die 4 and lower side die 5
Are connected and fixed to form an integral unit. Thereby, the wide groove 9a of the upper die 4 and the wide groove 9b of the lower die 5 are formed.
Are abutted to form a slit-shaped discharge port 9, and an injection port 7 is formed by the narrow groove 7a and the narrow groove 7b. The injection port 7 has substantially the same area as the discharge port 9, but the five kinds of coating agents are easily injected.
It is formed in a slightly wide rectangular shape. Further, at this time, a flow path 8 which is a space communicating from the injection port 7 to the discharge hole 9 is formed. FIG. 3 is a perspective view showing a state where only the flow path 8 is extracted.

As shown in FIG. 3, the injection port 7 is
Are arranged so as to be twisted substantially at right angles to the injection port 7, and the short side of the injection port 7 is connected to the long side of the discharge port 9, and the long side of the injection port 7 is connected to the short side of the discharge port 9. A channel 8 is formed. Further, the flow path 8 is formed so that the cross-sectional area is substantially the same in any flow path cross section. In other words, the shape of the injection port 7 can be changed without changing the cross-sectional area, while changing the aspect ratio of the shape.
The shape of the discharge port 9 is changed.

When the upper die 4 and the lower die 5 are connected and fixed, a bolt is inserted into the bolt hole 6b of the connecting member 6, and a bolt is inserted into the tap hole 4a between the upper die 4 and the lower die 5. The connecting member 6 is connected and fixed to the upper side die 4 and the lower side die 5 which are screwed in and connected. At this time, the supply pipe connecting portion 6a of the connecting member 6 is configured to be above the inlet 7. With this configuration, it is possible to inject five kinds of coating agents in a state of being arranged in the long side direction of the injection port 7.

The multilayer coating die 1 constructed as described above
Are arranged such that the longitudinal direction of the slit-shaped discharge port 9 is orthogonal to the traveling direction of the tape base material 3 and faces the backup roll 2.

The first to fifth coating material supply sources 11 to 15 supply different types of coating materials to the multilayer coating die 1. For example, the coating material A supplied from the first coating material supply source 11 is a fixability enhancer that enhances the fixability between the tape base material 3 and another coating material. Further, the coating material B supplied from the second coating material supply source 12 or the third coating material supply source 13
A coating agent C supplied from the fourth coating agent supply source 14 and a coating agent D supplied from the fourth coating agent supply source 14 include a pressure-sensitive adhesive containing a pigment and a pigment for coloring a manufactured pressure-sensitive adhesive tape, and peeling of the pressure-sensitive adhesive tape by impact Various coating agents such as a foaming coating agent for increasing the strength. The coating agent E supplied from the fifth coating agent supply source 15 is an adhesive for forming an adhesive layer. In this way, each of the coating agent supply sources 11 to 15
The coating agent necessary for producing a pressure-sensitive adhesive tape having the function according to the purpose is supplied to the multilayer coating die 1.

Each supply pipe for feeding the coating agents A to E supplied from each of the coating agent supply sources 11 to 15 to the multi-layer coating die 1 is connected to the connecting member 6 of the multi-layer coating die 1. It is communicatively connected to the supply pipe connecting portion 6a. For example, as will be apparent from the following description, when the tape base material 3 is multi-layer coated, the coating agent A, which is a fixing enhancer, is coated on the lowermost layer. A supply pipe for supplying A is connected and connected to a corresponding position of the supply pipe connection part 6a. The supply pipe is connected to the supply pipe connection part 6a so that the coating agent E, which is an adhesive, is applied to the uppermost layer on the tape base material 3.

Hereinafter, a series of operations in the multi-layer coating apparatus provided with the multi-layer coating die 1 will be described. Each coating material supply source 11-
15 supplies the coating agents A to E to supply pipes communicating with each other, for example, when the coating agent surface is pressurized by air. Coating agent A sent from each of these supply pipes
E is supplied to the connecting member 6 of the multilayer coating die 1.

The supply pipe connecting portion 6a of the connecting member 6 has the supply pipes arranged in a line.
The coating agents A to E injected into the injection port 7 from the
Are injected in a state of being arranged in the long side direction. The supply pressure of the supplied coating agents A to E further increases the coating agents A to E.
Flows through the flow channel 8 and is discharged from the discharge port 9. At this time, the coating agents A to E maintain the order in which they are arranged when being injected into the injection port 7 and have the cross-sectional shape as a whole.
The discharge port 9 is changed while being changed according to the cross-sectional shape of the flow path 8.
To reach. At this time, the coating agents A to
FIG. 4 shows a cross section of E.

As shown in FIG. 4, in the cross section 20 of the coating agents A to E at the injection port 7, they are arranged in a line in the long side direction of the discharge port 7. In the cross section 21 on the back side from the inlet 7, the cross-sectional shapes of the coating agents A to E as a whole are changed in accordance with the cross-sectional shape of the flow channel 8. At this time, each coating agent A ~
The cross-sectional shape of E changes at the same ratio.
In the cross section 22, the cross-sectional shape of each of the coating agents A to E has begun to be horizontally long. Further, in the section 23 on the far side, the coating agent A
The cross-sectional shape of each of the coating agents A to E is further horizontally long, while the cross-sectional shape of each of the coating agents A to E is horizontally long. In the cross section 24, each of the coating agents A to E is relatively thinly stacked in a multilayer shape. In the cross section 25 of the discharge port 9, each of the coating agents A to E is formed in a multilayer shape having a predetermined thickness for forming on the tape base material 3.

The discharge port 9 discharges the multi-layered coating agents A to E in the state of the cross section 25 to the base material 3. As a result, the tape base material 3 is applied in a state where the coating agents A to E are stacked in a multilayer shape with a predetermined thickness, that is, a multilayer coating is applied.

FIG. 5 is a sectional view of the pressure-sensitive adhesive tape manufactured at this time. As shown in FIG. 5, the pressure-sensitive adhesive tape is applied on the tape substrate 3 so as to be stacked in the order of the pressure-sensitive adhesives A, B, C, D, and E.

In the above-described multilayer coating die 1, by injecting several kinds of desired coating materials into the injection port 7, the number of layers to be discharged from the discharge port 9 can be set arbitrarily. It is possible to efficiently and easily cope with various conditions such as the number of layers and the thickness of the layers in the multilayer coating. In addition, since a plurality of types of coating agents are discharged from the single discharge port 9 in a multilayer shape, the number of layers can be increased without being limited to the number of discharge ports.

The coating agent A described in the above embodiment
Is not limited to the combination of ~ E, for example,
All the coating agents can be used as adhesives, and the present invention is not limited to the five types of coating agents. For example, one type of coating agent having different viscosities can be discharged in multiple layers.

The multilayer coating die 1 of this embodiment is
The thickness of each of the pressure-sensitive adhesives A to E was set to be substantially the same width after coating.
The thickness after coating can be changed by changing the cross-sectional area of each of E.

The shape of the injection port 7 or the discharge port 9
The size and the like are not limited to those described in this embodiment.For example, the opening areas of the injection port and the discharge port are made equal, and any flow path cross-sectional area in the flow path changes. If this is not done, the shapes and sizes of the discharge port and the injection port can be set arbitrarily.

In the above-described embodiment, as a result of applying the multi-layer coating to the base material under the following conditions, the multi-layer coating with a good boundary surface between the respective layers could be performed.

<Conditions> Adhesive A: Acrylic adhesive + 2 parts of crosslinking agent + blue pigment Viscosity 80 poise, solid component in adhesive 40% Adhesive B: Acrylic adhesive + 2 parts of crosslinking agent + yellow pigment Viscosity 80 poise, 40% solid component in adhesive Adhesive C: Acrylic adhesive + 2 parts of crosslinking agent + green pigment Viscosity 80 poise, 40% solid component in adhesive Adhesive D: Acrylic adhesive + crosslink Adhesive 2 parts + yellow pigment Viscosity 80 poise, solid component in adhesive 40% Adhesive E: Acrylic adhesive + crosslinker 2 parts + blue pigment Viscosity 80 poise, solid component 40% in adhesive Adhesive: PET 38 μm Coating thickness: 50 μm, substrate transfer speed: 1 m / min

[0037]

As is apparent from the above description, according to the first aspect of the present invention, the injection is performed in a line in the injection port.
By discharging more than one kind of coating agent in a state of being stacked in multiple layers from a discharge port, multilayer coating can be performed on the base material. Therefore, by simply injecting the necessary number of coating agents in a row into the injection port to perform the desired multilayer coating, the number of coating agents is not limited as in the conventional case, and the multilayer coating can be efficiently performed. It can be carried out.

According to the second aspect of the present invention, the pressure-sensitive adhesive and another kind of coating agent injected in a line in the injection port are discharged from the discharge port in a state of being stacked in multiple layers, so that the tape base material is discharged. Multi-layer coating can be applied to produce an adhesive tape. Therefore, by simply injecting the necessary number of coating agents in a row into the injection port to perform the desired multilayer coating, the number of coating agents is not limited as in the conventional case, and the multilayer coating can be efficiently performed. The applied adhesive tape can be manufactured.

According to the third aspect of the present invention, the inlet is disposed in a state of being twisted substantially at right angles to the outlet, and the flow path communicating from the inlet to the outlet is formed by the flow path. The shape of the injection port is changed from the shape of the injection port to the shape of the discharge port so that the cross-sectional area does not change. Can be ejected. In other words, as before,
Efficient multi-layer coating can be performed because there is no need for a discharge port for each type of coating agent, and there is no need to perform coating multiple times with a single discharge port. Further, multilayer coating with a desired number of coating agents can be performed more easily and easily.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a main part of a multilayer coating apparatus according to an embodiment.

FIG. 2 is an exploded perspective view of the multilayer coating die according to the embodiment.

FIG. 3 is a perspective view showing a flow path of a multilayer coating die according to an example.

FIG. 4 is a perspective view showing a state of a change in a cross-sectional shape of an application agent in a flow channel.

FIG. 5 is a cross-sectional view showing a state of a multi-layer coated tape base material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Multilayer coating die 2 ... Backup roll 3 ... Tape base material 4 ... Superior die 5 ... Lower die 6 ... Connecting member 7 ... Injection port 8 ... Flow path 9 ... Discharge ports A to E ... Coating agent

Claims (3)

[Claims] 1. A multi-layer coating method for coating two or more types of coating agents, at least one of which is an adhesive, on a substrate in a multi-layered form, wherein a slit-shaped discharge port for discharging the coating agent is provided. Arranged so that the longitudinal direction is almost perpendicular to the direction of travel of the substrate,
The injection port into which the coating material is injected is disposed in a state where the injection port is twisted substantially at right angles to the discharge port, and two or more types of coating materials are arranged in a line in the injection port and injected. A multi-layer coating method comprising: discharging a coating agent in a multilayer form from the discharge port to apply a multi-layer coating of an adhesive and another type of coating agent on a substrate. 2. A method for producing a pressure-sensitive adhesive tape in which a pressure-sensitive adhesive and a different kind of coating agent are applied in a multi-layer form on a tape base material, wherein the pressure-sensitive adhesive and the different kind of coating agent are discharged. Discharge ports are arranged so that the longitudinal direction thereof is substantially perpendicular to the direction of travel of the tape base material, and the injection port into which the adhesive and another type of coating agent are injected is substantially perpendicular to the discharge ports. The adhesive and another type of coating agent are arranged in a line in the injection port and injected, and the injected adhesive and another type of coating agent are discharged in a multilayer form from the discharge port. Let me
A method for producing a pressure-sensitive adhesive tape, comprising applying a pressure-sensitive adhesive and another kind of coating agent in a multilayer shape on a tape base material. 3. A multi-layer coating die for coating a coating material on a substrate in a multilayer shape, wherein the slit-shaped discharge port for discharging the coating material is substantially perpendicular to the discharge port. It is twisted and has an inlet for injecting two or more kinds of coating agents in a line.
In the flow path communicating from the inlet to the outlet, one side of the inlet in which the coating materials are arranged in a line narrows toward the outlet from the inlet and ends at the shorter side of the outlet. Along with, the other side of the injection port expands toward the discharge port from the injection port and ends at the long side of the discharge port, and in any flow path cross section from the injection port to the discharge port, A multilayer coating die characterized in that the cross-sectional areas are substantially equal.