JP2918365B2 - Adhesive tape winding 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 winding device for winding a pressure-sensitive adhesive tape or a pressure-sensitive adhesive sheet (hereinafter referred to as a pressure-sensitive adhesive tape) into a roll.

[0002]

2. Description of the Related Art A pressure-sensitive adhesive tape is generally coated with a pressure-sensitive adhesive on one side of a substrate, and is generally wound into a core material in the form of a coil. is there. In this case, at the time of winding, the adhesive on one side adheres to the other side (back side) with a relatively strong adhesive force.

Therefore, when the wound body is unwound during use, a strong unwinding force is required against the adhesive force, so that the adhesive may remain on the back side of the base material of the adhesive tape. As a result, blocking of the pressure-sensitive adhesive, layer cracks on the back surface of the base material, and the like occur.

In view of the above, a means for solving such a problem at the time of rewinding, that is, a so-called release treatment for reducing the rewinding force (developing force) of the pressure-sensitive adhesive tape, in other words, for imparting easy peelability. As a means, a method of applying a release agent to form a thin release layer on the back surface of the pressure-sensitive adhesive tape is known.

[0005]

However, in the above method of applying a release agent, the material of the release agent adheres firmly to the back surface of the base material and easily adheres to the adhesive. It is difficult to select a mold release agent because it requires the trade-off property of separation. For example, expensive materials such as linear alkyl group-containing polymers, silicone polymers, and perfluoropolymers are required, and complicated coating is required. Requires construction process. Therefore, while this method controls the cost of the whole product, the release agent that has been angle-coated on the wound body is transferred to the pressure-sensitive adhesive, which causes a decrease in the adhesive force of the pressure-sensitive adhesive.

Japanese Unexamined Patent Publication (Kokai) No. 61-103975 discloses a technique for simultaneously laminating an adhesive layer on a base material layer using a co-extrusion method with respect to a surface protective film. However, even in such a method, since it is necessary to perform a release treatment on the back surface of the base material layer, there is a problem similar to the method of applying the release agent, and there is a time constraint during the construction of the release treatment. And the problem is even greater.

[0007] The present invention has been made to solve the above-mentioned conventional problems, and by adding simple mechanical means,
The present invention relates to a pressure-sensitive adhesive tape winding device capable of reducing the developing force of the pressure-sensitive adhesive tape, that is, imparting easy peelability.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a pressure-sensitive adhesive tape coated with a pressure-sensitive adhesive on one side is sent out in the longitudinal direction of the pressure-sensitive adhesive tape. And a winding means for winding the pressure-sensitive adhesive tape on a core material in a roll form. A rotary shaft body is provided therebetween, and a cylindrical buff body which is attached to an outer peripheral portion of the rotary shaft body and comes into contact with the other surface side of the adhesive tape-shaped member in a rolling contact state is provided so as to be replaceable , The cylindrical bag
The rotational peripheral speed of the
Can be set to different speeds for the speed of the body
And said that you are.

[0009]

According to the present invention, the pressure-sensitive adhesive tape which is fed from the delivery means is
Before being wound by the winding means, a cylindrical buff body is rolled on the back surface of the adhesive tape-shaped body. Thereby, a sliding friction is generated between the back surface of the base material and the buff body, and a shear force due to the sliding friction acts on the back surface of the adhesive tape-like body,
Surface state changes such as minute unevenness changes and crystal morphological changes occur. The change in the surface state does not hinder the winding at the time of winding the wound body, but facilitates separation from the adhesive at the time of unwinding. When the ability to apply the shearing force is reduced, the baffle is replaced with a separately prepared baffle.

[0010]

FIG. 1 shows an embodiment of the overall construction of a winding device according to the present invention. As shown in the figure, the pressure-sensitive adhesive tape 1 fed out from a pressure-sensitive adhesive application step (not shown) serving as a sending means is guided with the upper side of the figure as the back side and the lower side of the figure as the side of the pressure-sensitive adhesive coating surface. The vehicle travels toward the roll 2.

Downstream of the guide roll 2 is provided a tension roll 3, and downstream of the tension roll 3, a receiving roll 4 and a baffle 5 are provided so that the roll surfaces contact each other. I have. On the downstream side of the rolls 4 and 5, a tension roll 6 and a pair of pinch rolls 7 and 8 are provided in that order, and on the downstream side of the pinch rolls 7 and 8, the pressure-sensitive adhesive tape is provided. A winding core (not shown) is provided as a winding means so that the body 1 can be wound.

Here, the base material of the pressure-sensitive adhesive tape 1 is as follows:
For example, a resin made of polyethylene resin and having a thickness of 60 μm is used.
Hydrogenated product of butadiene / styrene block copolymer 1
A pressure-sensitive adhesive liquid is prepared by applying a mixture of 00 parts by weight and 40 parts by weight of a tackifying resin to a uniform solution with toluene to form a pressure-sensitive adhesive layer. The winding core is made of, for example, a paper core having an inner diameter of 3 inches.

The pressure-sensitive adhesive tape 1 is, for example, 2
The vehicle travels in the longitudinal direction at a speed of 0 m / sec (line speed), and the baffle 5 is set to rotate at a peripheral speed (roll speed) of 90 m / sec, for example.
The direction of rotation of the baffle 5 is the same as the pressure-sensitive adhesive tape 1
Is the direction opposite to the traveling direction.

FIG. 2 shows a more detailed structure of the baffle 5, wherein the baffle 5 has a rotating shaft 5a,
A cylindrical body 5b, a cylindrical buff body 5c, and a pair of flanges 5d
Consists of Here, the tubular buff body 5c is formed by attaching a cloth sheet-shaped buff to an outer peripheral portion of the tubular body 5b via an appropriate adhesive.

A rotary shaft 5a is inserted into the cylindrical body 5b. Flanges 5d are respectively fitted to both ends of the rotating shaft 5a, and both flanges 5d are fixed to both ends of the cylindrical body 5b via screws. In addition, flange 5d
Is formed so that its maximum outer diameter is substantially the same as the maximum outer diameter of the cylindrical buff body 5c.

Next, the operation of the embodiment constructed as described above will be described. The pressure-sensitive adhesive tape 1 having the pressure-sensitive adhesive applied to one surface side in the pressure-sensitive adhesive application step passes between the receiving roll 4 and the baffle 5 via the guide roll 2 and the tension roll 3. During this passage, the back surface of the adhesive tape-shaped body 1 comes into contact with the roll surface of the rotating baffle 5, so that a sliding friction force acts on the back surface, and the sliding friction force acts as a shear force, and the adhesive tape A change in the surface state of the base material of the state body 1, that is, at least one of a morphological change and a crystalline morphological change of the surface is given.

In this case, the shearing force is determined mainly by the rotational force of the tension rolls 3, 6 and the baffle 5, for example, 3 to 20 kg / cm ² , more preferably 5 to ²⁰ kg / cm ² .
It is desirable to be in the range of 15 kg / cm ² .

The pressure-sensitive adhesive tape 1 to which the shear force is applied by the baffle 5 passes between the pinch rolls 7 and 8 and is wound around a paper core (not shown) to form a wound body. Even if the baffle 5 comes into contact with the back surface of the pressure-sensitive adhesive tape 1, no significant detachment of the buff fibers of the baffle 5 or deformation or damage of the base material of the pressure-sensitive adhesive tape 1 occurs.

Table 1 shows the results of measurement of the unfolding force and the initial adhesive force of the wound body under various curing conditions of the wound body. Is shown in comparison with a wound body formed by the above method.

Here, the deployment force is 30 m / sec.
The force required to rewind the pressure-sensitive adhesive tape from the wound body at a speed of g / 50 mm width is a converted value, and the initial adhesive force is the pressure-sensitive adhesive sheet-shaped body unwound from the wound body, Affixed to a stainless steel plate specified in JIS Z0237 by a laminator, left at 23 ° C for 30 minutes,
It is a value obtained by converting the force required for peeling at a speed of mm / min and at an angle of 180 degrees into a width of g / 50 mm.

From the results shown in Table 1, the rolling force of the wound body according to the present embodiment is 1/5 to 1/7 that of the comparative example.
It can be understood that the initial adhesive strength is also small.

[0022]

[Table 1]

In Table 1, * 1 indicates that the pressure-sensitive adhesive tape is elongated, and * 2 indicates that measurement is impossible because rewinding is impossible.

[0024]

As described above, according to the first aspect of the present invention, there is provided a delivery means for delivering an adhesive tape having one surface coated with an adhesive in the longitudinal direction of the adhesive tape. ,
In an apparatus for winding an adhesive tape-like body comprising a winding means for winding the adhesive tape-like body around a core material in a roll form, a rotating shaft is provided between the sending means and the winding means. Provided
Which is mounted on the outer periphery of the rotating shaft body, the adhesive tubular buff body in contact with the other surface of the tape-like article in rolling contact state is provided interchangeably, and, of the cylindrical buff body Rotational peripheral speed,
For the speed of the adhesive tape-like material sent from the sending means
Because it is characterized by being settable at different speeds, there is no need to use expensive and troublesome release agents, and the use of a cylindrical buff body with a simple configuration reduces the deployment force. It can be easily realized, and can contribute to a reduction in the product price of the roll of the adhesive tape.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing the overall configuration of a winding device according to the present invention.

FIG. 2 is an exploded perspective view showing an attached state of a cylindrical buff body.

[Explanation of symbols]

 1 adhesive tape, 5 baffle, 5a rotating shaft (rotating shaft), 5b tubular (rotating shaft), 5c buffing.

Claims (1)

(57) [Claims] 1. A delivery means for delivering an adhesive tape having one surface coated with an adhesive in a longitudinal direction of the adhesive tape, and the adhesive tape is wound into a core material in a wound form. In an apparatus for winding an adhesive tape comprising winding means for winding, a rotating shaft is provided between the sending means and the winding means, and the rotating shaft is mounted on an outer peripheral portion of the rotating shaft. A cylindrical buff body which is in rolling contact with the other surface of the adhesive tape body is provided so as to be replaceable , and the cylindrical buff body rotates.
The peripheral speed is the speed of the adhesive tape
A winding device for an adhesive tape-shaped body, wherein the speed can be set differently with respect to the degree .