JPH0523625A - Transfer type self-adhesive applicator - Google Patents

Abstract

PURPOSE:To provide a transfer type self-adhesive applicator capable of sufficiently transferring self-adhesive and improving productivity. CONSTITUTION:A silf-adhesive applied to the belt surface of a travelling endless belt 3 is turned to be semi-solid in a drying furnace 4. Between a turning roll 1 around which the endless belt 3 is wound and through first and second pressurizing rolls 7, 8, a sheet support body 9 passes. Since the sheet supporting body 9 is pressurized by the first and second pressure rolls 7, 8, pressing time is prolonged as long as it and semi-solid adhesive is sufficiently transferred to the sheet supporting body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a transfer type pressure sensitive adhesive coating device used for manufacturing pressure sensitive adhesive tapes and pressure sensitive adhesive sheets.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type is known, for example, as described in Japanese Patent Publication No. 39-16796. According to this, a coating part (adhesive coating device) for storing a liquid pressure-sensitive adhesive, the pressure-sensitive adhesive supplied from the coating part is applied to the non-adhesive belt surface side, and the belt length direction The endless belt running on the endless belt, a drying unit (drying device) for semi-solidly drying the adhesive applied to the endless belt, and a turn roll (iron roll) for winding the endless belt. A pressure roll (rubber roll) provided so as to be in contact with the pressure roll is provided, and the pressure-sensitive adhesive is transfer-coated onto one surface side of the sheet-like support that is inserted between the turn roll and the pressure roll and runs. Is configured.

Therefore, when the pressure roll is pressure-bonded to the turn roll side, the semi-solid pressure sensitive adhesive is peeled off from the endless belt and transferred to the sheet-shaped support.

[0004]

However, in the above-mentioned configuration of the prior art, when it is attempted to increase the traveling speed of, for example, an endless belt in order to improve the productivity, the pressure bonding time between the pressure roll and the turn roll is reduced. As a result, the transfer unevenness of the pressure-sensitive adhesive occurs. Therefore, in the transfer method, the pressure-sensitive adhesive tape and the pressure-sensitive adhesive sheet are, for example,
It is not possible to manufacture it at a speed exceeding 10 minutes.

Further, due to the reduction of the pressure-bonding time, the pressure-sensitive adhesive cannot be sufficiently embedded in the support, and a good product cannot be obtained. In addition, for example, even if the diameter of the pressing roll is increased to increase the pressure bonding time, the contact area with the turn roll does not increase in proportion to the increase in diameter. It is an effect.

The present invention has been made in view of the above problems of the prior art, and provides a transfer type pressure-sensitive adhesive coating apparatus capable of sufficiently transferring the pressure-sensitive adhesive and increasing the production speed. The purpose is to do.

[0007]

In order to achieve the above-mentioned object, the invention of claim 1 comprises a coating section for storing a liquid pressure-sensitive adhesive,
The adhesive supplied from the coating unit is applied to the belt surface side, and an endless belt running in the belt length direction,
A drying unit for drying the pressure-sensitive adhesive applied to the endless belt into a semi-solid state, and a pressing roll provided so that a roll surface is in contact with a turn roll that winds the endless belt, The roll is composed of at least two pressure rolls, and each of the pressure rolls has its axial direction substantially parallel to the sheet width direction of the sheet-like support and is juxtaposed in close proximity to each other. It is characterized in that the pressure-sensitive adhesive is peeled off and transferred to one surface side of the sheet-like support which is inserted between the pressure roll and the running.

[0008]

Since the sheet-shaped support passes between the first pressure roll and the turn roll and then further passes between the second pressure roll, it is applied to the surface side of the endless belt and dried. The semi-solid pressure-sensitive adhesive that has passed through the furnace is transferred to the sheet-shaped support without unevenness and in a sufficiently embedded state.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a coating apparatus according to the present invention.

As shown in FIG. 1, a non-adhesive endless belt 3 is wound between a pair of turn rolls 1 and 2, and one turn roll 1 is outside a drying furnace 4, that is, a carry-in port. The other turn roll 2 is disposed inside the drying furnace 4 near the outside of 4a. Both turn rolls 1,
2 has a diameter of 1500 [mm] and a roll length of 16
It is formed to have a diameter of 00 [mm] and is adapted to rotate in a counterclockwise direction in FIG.

Above the one turn roll 1, there is provided a coating section 5 for storing and dropping a liquid pressure-sensitive adhesive, and the pressure-sensitive adhesive 6 dropped on the endless belt 3. It is applied in a uniform state across the belt width direction.

At the lower position of the turn roll 1, the diameter is 250 [mm] and the roll length is 1, respectively.
Two pressing rolls 7 and 8 of 500 [mm] are provided, and the shafts 7a and 8a of the pressing rolls 7 and 8 are substantially parallel to the shaft 1a of the turn roll 1 and Each of them can be moved toward the shaft 1a via a moving mechanism described later.

At least the roll surface portion of both rolls 7 and 8 is made of a rubber body, and the rubber hardness of the rubber body is preferably, for example, a value of about 80 to 90, more preferably the central portion of the roll surface portion. It is desirable to set the roll diameter larger than that of both ends.

Between the turn roll 1 and the first and second pressing rolls 7 and 8, a sheet-like support 9 is adapted to run at a predetermined sheet speed (for example, 70 [m / min]). The sheet-like support 9 is mounted on a take-up reel 10 provided at an upper position of an original web portion (not shown) provided at a lower position of FIG.

FIG. 2 shows the pressure roll 7 (pressure roll 8).
Also has the same appearance), the pressing roll 7 has a roll surface portion 7A having a roll length substantially the same as the width of the sheet-shaped support 9, and the roll surface portion 7A has both end portions, respectively. An annular groove 7b is formed.

FIG. 3 shows a state before and after the movement of the two pressing rolls 7 and 8 (a chain line is separated from the turn roll 1), and the pressing rolls 7 and 8 are moved (not shown). The pressing force is determined by the mechanism, and the pressing roll 7
It is desirable to set the pressing force of No. ^{2 to} 5.0 [kg / cm ² ] and the pressing force of the pressing roll 8 to 3 to 4 [kg / cm ² ]. In addition, the sheet-shaped support 9 is the relay roll 18
The sheet-shaped support 9 wound around the pressing roll 7 via the press roll 8 and runs toward the winding roll 10 via the relay roll 19 or the like.

Next, the operation of this embodiment constructed as described above will be explained.

A liquid adhesive 6 is applied to the belt surface of the endless belt 3 above the turn roll 1 outside the carry-in port 4a, and when the adhesive 6 runs into the drying oven 4, the drying oven 4
When it is semi-solidified inside and the semi-solidified adhesive reaches the lower part of the turn roll 1, between the turn roll 1 and the first pressing roll 7, and then the second pressing roll 8 The sheet-shaped support body 9 is continuously pressed between these.

The pressure of the pressure rolls 7 and 8 increases the pressure bonding time. Therefore, the semi-solid pressure sensitive adhesive is used for the endless belt 3.
Is sufficiently peeled off from the belt surface of the sheet-like support 9
It is transferred evenly and in a fully embedded state.

Therefore, a good product can be obtained even when the sheet-shaped support 9 is run at the above-mentioned sheet speed ([70 m / min]). In addition, since annular grooves 7a and 8a are formed at both ends of the pressing roll 7 (the same applies to the pressing roll 8) in the roll length direction, when the sheet-shaped support 9 is running, the ends slide. There is no danger of wear.

[0021]

As described above, according to the invention of claim 1,
A coating section for storing a liquid pressure-sensitive adhesive, the pressure-sensitive adhesive supplied from the coating section is applied to the belt surface side, and an endless belt running in the belt length direction, and applied to the endless belt. A drying unit for drying the adhesive in a semi-solid state,
A turn roll that winds the endless belt is provided with a pressure roll provided so that the roll surface is in contact with the turn roll. The pressure roll is composed of at least two pressure rolls, and each pressure roll has the axial direction of the sheet. The pressure-sensitive adhesive on one surface side of the sheet-like support that is substantially parallel to the sheet width direction of the sheet-like support and is juxtaposed in a close state, and is inserted between the turn roll and the pressing roll to run. Since it is configured to peel off and transfer the adhesive, it is possible to lengthen the pressure bonding time when transferring the pressure-sensitive adhesive, and therefore, it is possible to perform evenly and in a fully embedded state, and the manufacturing speed of the product. Can be speeded up at least twice. Moreover, since it is only necessary to dispose two pressing rolls having a relatively small diameter, the mounting space can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

FIG. 2 is a plan view of the pressure roll shown in FIG.

FIG. 3 is an enlarged side view showing a state before and after movement of two pressure rolls.

[Explanation of symbols]

 1 turn roll, 3 endless belt, 4 drying furnace, 5 coating part, 6 adhesive, 7 pressing roll, 8 pressing roll, 9 sheet-like support.

Claims (1)

Claim: What is claimed is: 1. A coating section for storing a liquid pressure-sensitive adhesive, and the pressure-sensitive adhesive supplied from the coating section is applied to the belt surface side and runs in the belt length direction. An endless belt, a drying unit for drying the pressure-sensitive adhesive applied to the endless belt in a semi-solid state, and a pressing roll provided so that a roll surface is in contact with a turn roll that winds the endless belt. The pressure roll is composed of at least two pressure rolls, and each pressure roll has its axial direction substantially parallel to the sheet width direction of the sheet-like support, and is arranged in close proximity to each other. A transfer-type pressure-sensitive adhesive coating device configured to peel off and transfer the pressure-sensitive adhesive to one surface of a sheet-shaped support that is inserted between the turn roll and the pressure roll and runs. ..