WO2018061364A1

WO2018061364A1 - Production method and production device for adhesive tape roll

Info

Publication number: WO2018061364A1
Application number: PCT/JP2017/023864
Authority: WO
Inventors: 義浩中村; 勝実竹内; 園田　誠
Original assignee: 株式会社寺岡製作所
Priority date: 2016-09-29
Filing date: 2017-06-29
Publication date: 2018-04-05
Also published as: CN109789980A; JPWO2018061364A1; JP6778755B2

Abstract

Disclosed are: a production method for an adhesive tape roll, the method comprising a step for winding an adhesive tape a around a winding shaft 4 in an atmosphere having a pressure of less than 50,000 Pa; and a production device for an adhesive tape roll, the device being intended for use in said method and being provided with at least a vacuum chamber 1, a vacuum pump 2 for reducing pressure inside the vacuum chamber 1 to lower than 50,000 Pa, and the winding shaft 4 disposed in the vacuum chamber 1 for winding the adhesive tape a therearound. The adhesive tape roll production method and the production device for use in the method can inhibit the occurrence of bubble marks and contamination of foreign matter during winding of the adhesive tape, and can prevent defective appearance and a decrease in adhesiveness of the adhesive tape roll.

Description

Method and apparatus for manufacturing adhesive tape roll

The present invention relates to a method for producing a pressure-sensitive adhesive tape wound body that suppresses the generation of bubble marks and contamination of foreign matters when winding the pressure-sensitive adhesive tape, and prevents the pressure-sensitive adhesive tape from being deteriorated in adhesion performance and poor appearance. The present invention relates to a manufacturing apparatus for use in manufacturing.

The pressure-sensitive adhesive tape usually has a wide width (for example, a width of 100 mm to 3000 mm) and a long length (for example, winding) after a pressure-sensitive adhesive is continuously applied on a sheet-like support and an adhesive layer is formed through heat drying and the like. It is wound on a roll (this is called “jumbo roll”) having a length of 300 m to 10,000 m. After that, the jumbo roll is replaced with a short roll (for example, a winding length of 5 to 100 m) (this is called “log roll”) and sold to a processor. Then, the processor cuts the log roll into a narrow width desired by the consumer (for example, a width of 3 to 500 mm) and sells it to the consumer.

¡Since the adhesive tape has an adhesive layer, a particular problem occurs when it is wound into a roll. Specifically, the adhesive surface is smoothed due to foreign matters floating in the atmosphere adhering to the adhesive surface, entrained air becoming bubbles, or irregularities in the adhesive surface due to bubble marks (bubble marks). Property, adhesive performance, and appearance of adhesive tape are impaired.

These problems may cause particularly serious problems in the field of industrial pressure-sensitive adhesive tapes for which demand has increased in recent years. For example, when these pressure-sensitive adhesive tapes are used as pressure-sensitive adhesive tapes for optical members, transparency may be hindered due to air bubbles or cloudiness, which may hinder optical performance. In addition, when an adhesive tape with foreign matter mixed on the adhesive surface is used as a battery tape, internal short circuit between electrodes may occur due to the foreign matter, and the thickness of the adhesive layer will be uneven, adversely affecting the adhesive performance. There is a risk of giving. Furthermore, when it is used for the manufacturing process of electronic parts and precision parts, when the inspection camera in the process detects the part as abnormal or when the adhesive tape is peeled and removed, defects on the adhesive surface will appear on the target adherent surface. It may remain as a trace. Therefore, in these applications, an adhesive tape in which bubbles or foreign matters are mixed may be discarded as a defective product.

Conventionally, it is known that the touch winding method under atmospheric pressure is effective in preventing air entrainment. More specifically, this winding method is a method in which the touch roll is pressed against the adhesive tape to remove the air. However, even with this method, it is difficult to completely eliminate air if the adhesive tape has a thickness difference. If the contact pressure of the touch roll is increased in order to alleviate the influence of the thickness difference, a large pressure difference occurs in the thickness difference portion, and the adhesive tape may be deformed. Moreover, foreign matters floating in the air cannot be excluded. As another winding method of the adhesive tape, a near winding method in which a near roll is disposed in the vicinity of the winding shaft is known. The near-winding method is useful for adhesive tapes that shrink with time. Normally, when the adhesive tape is wound while preventing air from being wound, a deformation called a gauge band occurs due to changes over time, but the near winding method intentionally winds air in anticipation of the shrinkage after winding. It is. However, the problem of bubbles remaining after the passage of time, bubble traces, and foreign matters cannot be solved.

It is known to prevent foreign matter from being mixed with technology that cleans the entire manufacturing environment. However, cleanliness of the entire factory building requires maintenance and management, and requires a lot of investment. In addition, even if the factory building is covered with a clean booth, there is a risk that foreign matter will enter the booth from the outside when carrying in raw materials.

Although it is a field different from adhesive tape, a method for eliminating air during winding has been proposed. For example, Patent Document 1 discloses a web winding method in which air is sucked at a location immediately before winding a web. According to this method, since it is not necessary to contact the roll immediately before winding, the web is not damaged, and air can be prevented from being caught between the web layers. However, it is estimated that the degree of decompression is relatively close to atmospheric pressure from the point that the web to be wound is specifically paper or plastic film and the point of sucking air under atmospheric pressure environment. In addition, since the suction nozzle is arranged immediately before winding, if this method is used for the adhesive tape, the adhesive surface may be adhered to the nozzle by an air flow caused by suction. Therefore, unlike the case of winding a non-adhesive member such as paper or plastic film, using this method for an adhesive tape may cause a line trouble.

Patent Document 2 discloses a web winding method in a negative pressure environment provided with an exhaust mechanism. Specifically, it is a method of reducing the amount of air entrained between the web layers by surrounding the winding location with a sealed box and setting the inside to a negative pressure. However, the degree of decompression in the sealed box is estimated to be relatively close to the atmospheric pressure from the point that the web to be wound is specifically paper and the closed box shown in FIG. 1 has a large opening. . Furthermore, the “nip portion” of the reel drum of the apparatus shown in FIG. 1 is a term that generally means a portion that strongly holds a winding object. The purpose of the “nip portion” is to prevent air from being caught by pressing the reel drum against the winding portion. Therefore, due to the fact that this “nip part” is required in the apparatus of Patent Document 2, a large amount of air still remains in the sealed box, that is, the degree of decompression is relatively close to atmospheric pressure. I understand that. In addition, there is a risk of deformation or scratches at the “nip”.

Even if the techniques of

Patent Documents

1 and 2 described above are used for the adhesive tape, the problems specific to the adhesive tape, that is, the deterioration of the adhesive performance due to bubble marks and foreign matter contamination and the problem of poor appearance cannot be solved.

JP 2013-151360 A JP 2000-264504 A

An object of the present invention is to suppress the generation of bubble marks and foreign matters when winding an adhesive tape, and to prevent the deterioration of the adhesive performance and the appearance defect of the adhesive tape wound body, and the manufacturing method of the adhesive tape wound body It is to provide a manufacturing apparatus for use in the method.

The present invention is a method for manufacturing a pressure-sensitive adhesive tape roll having a step of winding the pressure-sensitive adhesive tape around a winding shaft in an atmosphere of a pressure of less than 50,000 Pa.

Furthermore, the present invention is an adhesive tape wound body manufacturing apparatus for use in the above method,
A vacuum chamber;
A vacuum pump for reducing the pressure inside the vacuum chamber to a pressure of less than 50,000 Pa;
An apparatus for producing a pressure-sensitive adhesive tape winding body comprising at least a take-up shaft disposed inside the vacuum chamber for winding the pressure-sensitive adhesive tape.

According to the present invention, it is possible to suppress the generation of bubble marks and contamination of foreign matters when winding the adhesive tape, and it is possible to prevent the adhesive performance of the adhesive tape wound body from being deteriorated and the appearance is poor. Further, since the nip roll or the touch roll is not necessarily required when winding the adhesive tape, it is possible to prevent the adhesive tape from being deformed or damaged due to the pressing of the roll. Therefore, it is very useful as a manufacturing method and a manufacturing apparatus for an adhesive tape roll for an optical member, a battery, or various processes.

It is typical sectional drawing which shows one Embodiment of the manufacturing apparatus of the adhesive tape winding body of this invention. It is typical sectional drawing which shows one Embodiment of the manufacturing apparatus of the adhesive tape winding body of this invention. It is typical sectional drawing which shows one Embodiment of the manufacturing apparatus of the adhesive tape winding body of this invention. It is typical sectional drawing which shows other one Embodiment of the manufacturing apparatus of the adhesive tape winding body of this invention. It is typical sectional drawing which shows other one Embodiment of the manufacturing apparatus of the adhesive tape winding body of this invention. It is an external appearance photograph of the jumbo roll used in the Example and the comparative example. 2 is an appearance photograph of a log roll of Example 1. 6 is an appearance photograph of a log roll of Example 4. It is an external appearance photograph of the log roll of Example 6. It is an external appearance photograph of the log roll of Example 8. 2 is an appearance photograph of a log roll of Comparative Example 1. 6 is an appearance photograph of a log roll of Comparative Example 2. 10 is an appearance photograph of a log roll of Comparative Example 3.

[Production equipment for wound adhesive tape]
FIG. 1 is a schematic cross-sectional view showing an embodiment of an apparatus for producing an adhesive tape roll of the present invention. The apparatus shown in FIG. 1 is an apparatus for use in the method of the present invention, comprising a vacuum chamber 1, a vacuum pump 2 for reducing the pressure inside the vacuum chamber 1 to a pressure of less than 50,000 Pa, and an adhesive tape. At least a winding shaft 4 disposed inside the vacuum chamber 1 for winding. Moreover, in order to run the adhesive tape a wound around the winding shaft 4 while continuously rewinding, it further has a feeding shaft 3 disposed inside the vacuum chamber.

In the apparatus shown in FIG. 1, a feeding shaft 3 and a winding shaft 4 are disposed in a vacuum chamber 1, and a jumbo roll A is set on the feeding shaft 3. And the edge part of the adhesive tape a of the jumbo roll A is connected to the winding shaft 4, and the adhesive tape a continues to the winding shaft 4 by continuously rotating the winding shaft 4 by a driving device (not shown). Rolled up. Further, along with this winding, the jumbo roll A rotates around the feeding shaft 3 and the adhesive tape a of the jumbo roll A is continuously rewound. By such an operation, a log roll B (adhesive tape roll) is obtained.

The jumbo roll A is a roll having a wide width (for example, a width of 100 mm to 3000 mm) and a long length (for example, a winding length of 300 m to 10000 m) around which the adhesive tape a immediately after manufacture is wound. The manufacturer first manufactures and stores a wide and long jumbo roll A in the manufacturing process of the adhesive tape a, and sells the adhesive tape a of the jumbo roll A to a short length (for example, a length of 5). The log roll B is generally sold after being rolled up to a log roll B of ~ 100 m). That is, the adhesive tape roll manufacturing apparatus of the present invention is also preferable as an apparatus for manufacturing such a short log roll B (adhesive tape roll).

In the apparatus shown in FIG. 1, the adhesive tape a continuously unwound from the jumbo roll A includes a peeling roll 5, a guide roll 6 a, a feed roll 7, a guide roll 6 b, a tension detection roll 8, a guide roll 6 c, a near / The film is continuously wound around the winding shaft 4 through the touch serving roll 9.

The peeling roll 5 is a roll for suppressing flapping when peeling (rewinding) the adhesive tape a of the jumbo roll A, and the position can be adjusted by the swing arm 10a. The position of the peeling roll 5 can follow the change in the outer diameter of the jumbo roll A, and the outer diameter of the jumbo roll A can be calculated or measured, whereby the brake output can be arbitrarily adjusted.

The feed roll 7 is a roll for feeding with the nip roll 11 sandwiching the adhesive tape a. The position of the nip roll 11 can be adjusted (on / off of pinching) by the swing arm 10b. The tension detection roll 8 is a roll for detecting the tension of the adhesive tape a that continuously moves from the jumbo roll A side to the log roll B side. If the feed roll 7 and the tension detection roll 8 are provided, the tension can be easily controlled. For example, it is possible to cut the tension by using a nip roll 11 in combination with a motor obtained by applying a non-adhesive treatment to the feed roll 7 and a motor. Further, the tension is detected by the tension detection roll 8, the detection result is fed back to the take-up shaft 4 side, and the output can be adjusted by the clutch and motor of the take-up shaft 4 according to the target tension.

The near / touch roll 9 is a roll immediately before the take-up shaft 4 and can be adjusted in position by the swing arm 10c. When performing the near winding method, the position of the near / touch combined roll 9 may be set in the vicinity of the surface of the log roll B of the winding shaft 4 (FIG. 2). The touch-purpose roll 9 may be brought into contact with the surface of the log roll B of the winding shaft 4 (FIG. 3).

The material of the various rolls is not particularly limited, and may be determined according to the configuration of the adhesive tape. Moreover, you may use together a special roll, such as a groove, as a wrinkle countermeasure at the time of conveyance and winding.

1 is connected to a vacuum pump 2 through a vacuum valve 12 and a vacuum gauge 13 is connected to the vacuum chamber 1 of the apparatus shown in FIG. The vacuum pump 2 is for depressurizing the inside of the vacuum chamber 1 to a pressure of less than 50,000 Pa. Before winding the adhesive tape a on the winding shaft 4, the vacuum pump 2 sucks the air in the vacuum chamber 1 and adjusts it to a predetermined degree of vacuum. The degree of vacuum can be adjusted by opening / closing the vacuum valve 12 or adjusting the opening. Then, the vacuum level may be monitored by the vacuum gauge 13 to manage the vacuum conditions.

The apparatus shown in FIGS. 1 to 3 described above is a preferred embodiment of the present invention, but the apparatus of the present invention is not limited to this. For example, although the near / touch roll 9 is used in the apparatus shown in FIGS. 1 to 3, a near roll or a touch roll may be used instead. Furthermore, the tension control system, the drive system, the arrangement of the guide roll, the type of the guide roll, the shape of the vacuum chamber, and the constituent devices of the vacuum system are not particularly limited in the present invention.

FIG. 4 is a schematic cross-sectional view showing another embodiment of the apparatus for producing an adhesive tape roll of the present invention. In the apparatus shown in FIGS. 1 to 3, both the feeding shaft 3 and the winding shaft 4 are arranged in the vacuum chamber 1, but in the apparatus shown in FIG. 4, only the winding shaft 4 is arranged in the vacuum chamber 1. The other devices are arranged outside the vacuum chamber 1. That is, it is an apparatus for partially evacuating only the periphery of the winding shaft 4. Such an embodiment is useful, for example, in terms of downsizing the vacuum chamber 1 or the like.

In the apparatus shown in FIG. 4, the near roll 9 a is used, and the adhesive tape a enters the inside through the opening 1 a of the vacuum chamber 1. The opening 1a may be a small opening that allows the inside of the vacuum chamber 1 to be decompressed to a pressure of less than 50,000 Pa by the vacuum pump 2. Labyrinth seal technology can also be used.

FIG. 5 is a schematic cross-sectional view showing another embodiment of the apparatus for producing an adhesive tape roll of the present invention. In the apparatus shown in FIG. 5, when the jumbo roll A is obtained by taking up the adhesive tape a obtained through the adhesive application device 14 and the heat drying device 15 of the adhesive tape, the take-up for taking up the jumbo roll A is taken up. This is an apparatus in which a shaft 4 a is provided in the vacuum chamber 1. That is, the pressure-sensitive adhesive application step and the heat drying step are performed under atmospheric pressure, and only the jumbo roll A winding step is evacuated. That is, the present invention is useful not only in the production of the log roll B but also in the production of such a jumbo roll A.

4 and 5, the near roll 9a is disposed outside the vacuum chamber 1, but the apparatus of the present invention is not limited to this. For example, an apparatus in which the near roll 9a of the apparatus shown in FIGS. 4 and 5 is disposed inside the vacuum chamber 1 is also a preferred embodiment of the present invention.

[Method for producing adhesive tape roll]
The method for producing the pressure-sensitive adhesive tape wound body of the present invention winds the pressure-sensitive adhesive tape a around the take-up shaft 4 in an atmosphere having a pressure of less than 50,000 Pa, preferably 40,000 Pa or less, more preferably 10,000 Pa or less. It is a method having a process. By winding in an environment of such a pressure (degree of vacuum), the air wound between the layers of the adhesive tape a is reduced. Also, since the foreign matter is difficult to float in the vacuum environment, the adhesive tape winding body (log roll B in FIGS. 1 to 4 and jumbo roll A in FIG. ) Can be manufactured. In addition, due to the degassing effect due to the vacuum environment and the decrease in the amount of oxygen between the adhesive tape layers, the change in the adhesive properties over time can be mitigated.

The production method of the present invention usually includes a step of exposing the obtained adhesive tape roll (log roll B in FIGS. 1 to 4 and jumbo roll A in FIG. 5) to atmospheric pressure after the winding step. When the pressure-sensitive adhesive tape roll (log roll B in FIGS. 1 to 4 and jumbo roll A in FIG. 5) obtained in the vacuum chamber 1 is exposed to atmospheric pressure, there is a phenomenon that there is no bubble trace visible on the appearance. Arise. The reason for this is considered to be that the pressure-sensitive adhesive layer of the pressure-sensitive adhesive tape a undergoes plastic deformation under the influence of pressure change when returning from vacuum to atmospheric pressure. Specifically, even if air is entrained in a vacuum environment, it acts to reduce it to the extent that it is difficult to visually recognize using the pressure change when it is taken out under atmospheric pressure, and even the uneven deformation generated in the adhesive layer Also, there is an effect that the pressure is changed between the layers of the adhesive tape a to be reshaped into a smooth state. As a result, it is considered that the uneven deformation of the pressure-sensitive adhesive layer is caused by re-molding along the shape of the back surface (support surface). This is a unique action that occurs only in the pressure-sensitive adhesive tape a, unlike paper and films that do not have a pressure-sensitive adhesive layer (a layer that easily undergoes plastic deformation).

In the conventional method of pressing the adhesive tape a with a nip roll or a touch roll under atmospheric pressure, uneven contact pressure occurs due to variations in the thickness of the adhesive tape a or variations in dimensional accuracy of the roll, and the adhesive tape a is deformed. There is a fear. On the other hand, in the present invention, it is not always necessary to press the pressure-sensitive adhesive tape a, and the pressure applied by the change from the low pressure to the atmospheric pressure is applied to the pressure-sensitive adhesive tape a without any unevenness.

In the winding process, the adhesive tape a wound around the feeding shaft 3 may be run while being continuously rewound, and the adhesive tape a may be continuously wound around the winding shaft 4. Specifically, it is suitably applied to a manufacturing process in which the jumbo roll A is rewound to the log roll size B. In this case, as shown in FIG. 4, at least the winding shaft 4 may be disposed in the vacuum chamber 1 decompressed to a pressure of less than 50,000 Pa. More preferably, as shown in FIGS. 1 to 3, both the feeding shaft 3 and the take-up shaft 4 are disposed in a vacuum chamber 1 whose pressure is reduced to a pressure of less than 50,000 Pa. In the conventional method of winding the adhesive tape a under atmospheric pressure, the noise generated when the adhesive tape a is peeled off is large, and thus an earplug is usually required for an operator. On the other hand, as shown in FIGS. 1 to 3, when not only the take-up shaft 4 but also the feed shaft 3 is arranged in the vacuum chamber 1, the position where the adhesive tape a is peeled off is sealed and the pressure is reduced. There is also an advantage that the vibration of air is not easily transmitted and the problem of noise is reduced.

In the winding process, the winding state of the adhesive tape a may be adjusted by either a near roll, a touch roll, or a near / touch combined roll. By installing these rolls, air entrainment can be further suppressed. For example, in FIGS. 1 to 3, the roll immediately before the winding shaft 4 is a near / touch roll 9, and in FIGS. 4 to 5, the roll immediately before the winding shaft 4 is a near roll 9a. When the touch roll is used, it comes into contact with the outermost peripheral surface of the pressure-sensitive adhesive tape roll (log roll B in FIGS. 1 to 4 and jumbo roll A in FIG. 5) within a pressure range that does not cause deformation or damage to the pressure-sensitive adhesive tape a. It is good to adjust the winding state of the adhesive tape a.

The environment such as temperature and humidity when using the production method of the present invention is not particularly limited. A normal temperature, specifically 20 ° C. ± 15 ° C. and normal humidity, specifically a relative humidity of 45% to 85% is preferable. Further, it is possible to appropriately select a suitable range for various winding conditions, but the pressure-sensitive adhesive tape width is 3 to 3,000 mm, the pressure-sensitive adhesive tape length is 5 to 10,000 m, and the winding speed is 5 m / min to 100 m / The range is preferably within a range of min and a winding tension of 5 to 1,000 N / m.

The manufacturing method of the present invention includes, for example, a log roll manufacturing process (FIGS. 1 to 4) for rewinding the jumbo roll A to the size of the log roll B, and a jumbo roll manufacturing process (FIG. 5) that is wound immediately after the jumbo roll A is manufactured. It is possible to apply to a manufacturing process (not shown) of a short-width wound body that is cut to a desired width with a slitter while rewinding the jumbo roll A.

Furthermore, the manufacturing method of the present invention can be applied to a log roll manufacturing process (not shown) in which, for example, a jumbo roll A with a separator is rewound to a log roll B without a separator. In this case, for example, a mechanism for peeling the separator and a mechanism for winding the separator may be further arranged.

[Adhesive tape]
The pressure-sensitive adhesive tape used in the method and apparatus for producing a pressure-sensitive adhesive tape roll of the present invention usually has a pressure-sensitive adhesive layer on one side or both sides of a support. The kind of support body of an adhesive tape is not specifically limited. For example, a resin film, a nonwoven fabric, a metal foil, paper, a cloth, or a combination of these may be used. Of these, a resin film (particularly transparent) in which the appearance of bubbles and foreign matters affects the appearance is preferable. Examples of the resin film include polyester resins, polypropylene resins, polycarbonate resins, polystyrene resins, polyethylene resins, (meth) acrylic resins, polyacetal resins, acetate resins, polyethersulfone resins, polyolefin resins, Fluorine resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyvinyl alcohol resin, polyarylate resin, polyphenylene sulfide resin and the like can be mentioned. Among these, a film made of a polyester resin, a polypropylene resin, or a polyethylene resin that is suitably used for optical applications or other industrial applications is more preferable.

¡The type of the adhesive that constitutes the adhesive layer of the adhesive tape is not particularly limited. For example, an acrylic adhesive, a urethane-based adhesive, a silicone-based adhesive, or a rubber-based adhesive can be used. Among these, a transparent or translucent acrylic pressure-sensitive adhesive, urethane pressure-sensitive adhesive, or silicone-based pressure-sensitive adhesive in which bubbles and foreign matters affect the appearance is preferable.

Examples of the acrylic pressure-sensitive adhesive include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth ) Mainly composed of (meth) acrylic acid ester monomers such as isooctyl acrylate, nonyl (meth) acrylate, isononyl (meth) acrylate, and (meth) acrylic acid, crotonic acid, fumaric acid, itaconic acid, ( Anhydrous) known acrylics obtained by copolymerizing monomers containing functional groups such as maleic acid, vinyl acetate, acrylonitrile, styrene, 2-hydroxyethyl (meth) acrylate, 2-methylolethyl acrylamide, etc. as required System adhesives. When the base polymer of the pressure-sensitive adhesive is crosslinked using a crosslinking agent such as an isocyanate compound, an acid anhydride, an amine compound, an epoxy compound, a metal chelate or an aziridine compound, a high cohesive force of the pressure-sensitive adhesive layer can be obtained. This is preferable.

The composition of the urethane pressure-sensitive adhesive is not particularly limited, and is a pressure-sensitive adhesive mainly composed of a polyurethane resin obtained by curing a polyol and a polyfunctional isocyanate compound. Examples of the polyol include polyester polyol, polyether polyol, polycaprolactone polyol, and polycarbonate polyol. Examples of the polyfunctional isocyanate compound include polyfunctional aliphatic isocyanate compounds and polyfunctional aromatic isocyanate compounds.

Examples of the silicone-based pressure-sensitive adhesive include a silicone-based pressure-sensitive adhesive having a base polymer such as silicone rubber or silicone resin. Examples of the silicone rubber include organopolysiloxane containing dimethylsiloxane as a structural unit. A functional group (for example, vinyl group) may be introduced into the organopolysiloxane as necessary. Examples of the silicone resin include a silicone resin obtained by condensing a polyfunctional organosiloxane constituent unit and a monofunctional organopolysiloxane.

The adhesive tape may have a release liner on the adhesive layer, or may be a baseless type adhesive tape in which only the adhesive layer is laminated on the release liner. Moreover, the adhesive tape may have another layer. For example, a primer layer for improving the adhesiveness between the pressure-sensitive adhesive and the support, a back surface release treatment layer for facilitating unwinding, or a functional layer such as a light shielding layer, an electromagnetic wave shielding layer, or an antistatic layer. It is done.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

<Example 1>
With respect to 100 parts by mass of a commercially available acrylic adhesive material (product name: Cybinol (registered trademark) SN-007, manufactured by Syden Chemical Co., Ltd.) It was added and diluted with 90 parts by mass of ethyl acetate to obtain a pressure-sensitive adhesive composition. By applying this pressure-sensitive adhesive composition to the non-release-treated side of a 25 μm thick polyester film (width 250 mm, length 300 m) having a release treatment on one side, and heating and drying, a single-sided adhesive tape (Adhesive thickness 25 μm, total thickness 50 μm) was obtained. This single-sided pressure-sensitive adhesive tape was wound up by a near winding method to obtain jumbo roll A shown in FIG.

This jumbo roll is set on the feeding shaft 3 of the manufacturing apparatus of the present invention shown in FIG. 1, and the normal temperature, normal humidity, the pressure in the vacuum chamber is 500 Pa, the surface of the near / touch combined roll 9 and the outermost peripheral surface of the log roll B Was rolled to a take-up shaft under the conditions of a distance of 80 mm, a take-up speed of 5 m / min, and a take-up tension of 30 N / 250 mm to obtain a log roll B (winding length of 100 m).

<Example 2>
A log roll (winding length of 50 m) was obtained in the same manner as in Example 1 except that the winding speed was changed to 10 m / min and the winding length of the log roll B was changed to 50 m.

<Example 3>
A log roll B was obtained in the same manner as in Example 1 except that the winding speed was changed to 10 m / min and the winding tension was changed to 40 N / 250 mm.

<Example 4>
A log roll B was obtained in the same manner as in Example 1 except that the winding speed was changed to 10 m / min.

<Example 5>
A log roll B was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 1,000 Pa and the winding speed was changed to 10 m / min.

<Example 6>
A log roll B was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 5,000 Pa and the winding speed was changed to 10 m / min.

<Example 7>
A log roll B was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 10,000 Pa and the winding speed was changed to 10 m / min.

<Example 8>
A log roll B was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 40,000 Pa and the winding speed was changed to 10 m / min.

<Comparative Example 1>
A log roll was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 50,000 Pa and the winding speed was changed to 10 m / min.

<Comparative example 2>
A log roll was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to 90,000 Pa and the winding speed was changed to 10 m / min.

<Comparative Example 3>
A log roll was obtained in the same manner as in Example 1 except that the pressure in the vacuum chamber was changed to atmospheric pressure (100,000 Pa) and the winding speed was changed to 10 m / min.

The log rolls produced in the above Examples and Comparative Examples were taken out from the apparatus under atmospheric pressure, and evaluated after 24 hours according to the following methods. The results are shown in Table 1.

[Bubble traces]
The appearance of the log roll was visually observed, and various large and small circular patterns generated when air was entrained were judged as bubble marks and evaluated according to the following criteria.
“○”: No bubble mark “△”: Little bubble mark and many parts without bubble mark “×”: Many bubble marks

[Unevenness on the surface of the adhesive layer]
The pressure-sensitive adhesive tape on the outermost periphery of the log roll was rewound, the surface of the pressure-sensitive adhesive layer was visually observed, a linear or circular pattern that appeared cloudy or dim was judged as unevenness, and evaluated according to the following criteria.
“○”: no irregularities “△”: few irregularities and many areas without bubble marks “×”: many irregularities

[Adhesive force]
For the log roll adhesive tapes of Example 4 and Comparative Example 3, 180 ° adhesive strength (N / 20 mm) was measured according to the following procedure in accordance with JIS-Z-1528. Adhesive tape is attached to the adherend (SUS plate) in an atmosphere of temperature 23 ± 1 ° C and humidity 50 ± 5%, and it is pressed once with a 2kg roller. After standing for 30 minutes, a tensile tester (Toyo Seiki) The product was peeled from the adherend under the conditions of a peeling angle of 180 ° and a peeling speed of 5.0 mm / sec using a product name “STROGRAPE EL” manufactured by Seisakusho, and the adhesive strength (N / 20 mm) was measured.

[Adherent foreign matter / scratches]
The appearance of the log roll and one layer of the outermost outer periphery were visually observed, and compared with the jumbo roll, the increase in foreign matter adhesion or scratches was evaluated according to the following criteria.
“○”: No increase in adhering foreign matter / scratches “△”: Increase in adhering foreign matter / scratches is infinitely small, and sometimes there are intervening “×”: Increase in adhering foreign matter / scratches

[Log Roll Transformation]
The log rolls of Examples 1 to 8 and Comparative Examples 1 and 2 were further stored for 7 days at room temperature and normal humidity, visually checked for deformation by appearance observation, and evaluated according to the following criteria.
“○”: No deformation “×”: Deformation

[Appearance photo]
The adhesive tapes wound on the log rolls of Examples 1, 4, 6, and 8 and Comparative Examples 1 to 3 were illuminated from the inside and photographed with a digital camera. The photographs are shown in FIGS. The figure on the left is a photograph adjusted so that the contrast of transmitted light due to bubble marks is emphasized, and the figure on the right is an enlarged photograph of the defective part.

<Evaluation>
As is apparent from Table 1 and FIGS. 7 to 10, in Examples 1 to 8, it is possible to obtain a highly transparent pressure-sensitive adhesive tape wound body that is free from bubble marks and foreign matters and does not have white turbidity due to unevenness of the pressure-sensitive adhesive surface. It was. On the other hand, as is apparent from Table 2 and FIGS. 11 to 13, in Comparative Examples 1 to 3, there were many bubble traces and foreign matters, and white turbidity due to unevenness of the adhesive surface also occurred. Such a problem occurred more prominently as the pressure in the vacuum chamber was closer to the atmosphere side.

According to the method and apparatus for producing a pressure-sensitive adhesive tape roll of the present invention, there is provided a pressure-sensitive adhesive tape roll that is free of bubbles, bubble marks, foreign matters and the like, has a smooth pressure-sensitive adhesive surface, and is excellent in appearance. Can do. Therefore, it is useful as a manufacturing method and a manufacturing apparatus of an adhesive tape roll for an optical member, a battery, or various processes.

A jumbo roll B log roll a adhesive tape 1 vacuum chamber 1a opening 2 vacuum pump 3 feed shaft 4 take-up shaft 5

peeling roll

6, 6a, 6b, 6c guide roll 7 feed roll 8 tension detection roll 9 near / touch combined roll 9a Near

roll

10a, 10b, 10c Swing arm 11 Nip roll 12 Vacuum valve 13 Vacuum gauge 14 Adhesive application device 15 Heat drying device

Claims

A method for producing an adhesive tape roll having a step of winding an adhesive tape around a winding shaft in an atmosphere of a pressure of less than 50,000 Pa.
The method for producing a pressure-sensitive adhesive tape winding body according to claim 1, further comprising a step of exposing the pressure-sensitive adhesive tape winding body to atmospheric pressure after the step of winding the pressure-sensitive adhesive tape around the winding shaft.
The pressure-sensitive adhesive according to claim 1, wherein in the step of winding the pressure-sensitive adhesive tape around the take-up shaft, the pressure-sensitive adhesive tape wound around the feeding shaft is run while being continuously rewound, and the pressure-sensitive adhesive tape is continuously wound around the take-up shaft. Manufacturing method of tape winding body.
4. The method for producing a pressure-sensitive adhesive tape roll according to claim 3, wherein in the step of winding the pressure-sensitive adhesive tape on the take-up shaft, at least the take-up shaft is disposed in a vacuum chamber depressurized to a pressure of less than 50,000 Pa.
The production of the pressure-sensitive adhesive tape winding body according to claim 4, wherein in the step of winding the pressure-sensitive adhesive tape on the take-up shaft, the feeding shaft and the take-up shaft are arranged in a vacuum chamber depressurized to a pressure of less than 50,000 Pa. Method.
The method of manufacturing a pressure-sensitive adhesive tape roll according to claim 1, wherein in the step of winding the pressure-sensitive adhesive tape on the winding shaft, the wound state of the pressure-sensitive adhesive tape is adjusted by either a near roll, a touch roll, or a near / touch combined roll. .
An adhesive tape roll manufacturing apparatus for use in the method according to claim 1,
A vacuum chamber;
A vacuum pump for reducing the pressure inside the vacuum chamber to a pressure of less than 50,000 Pa;
An apparatus for producing an adhesive tape winding body, comprising at least a winding shaft disposed inside the vacuum chamber for winding the adhesive tape.
The manufacturing apparatus of the adhesive tape winding body of Claim 7 which further has a delivery axis | shaft arrange | positioned in the inside of a vacuum chamber in order to make it run, winding up the adhesive tape wound continuously.
The manufacturing apparatus of the adhesive tape winding body of Claim 7 which has either the near roll arrange | positioned inside a vacuum chamber, the touch roll, or the near / touch combined roll in order to adjust the winding state of an adhesive tape.