JP2013049814A - Double-sided adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-sided adhesive tape which is produced by adhering release paper on one side of a polyethylene terephthalate (PET) film through the first adhesive layer and forming the second adhesive layer on the other side of the PET film, and can prevent the generation of the wrinkles of the PET.SOLUTION: The double-sided adhesive tape 1 produced by adhering the release paper 4 on one side of the PET film 2 through the first adhesive layer 3 formed on the side and forming the second adhesive layer 5 on the other side of the PET film 2, and then winding up the formed adhesive tape on a winding core is characterized by using a portion in a constant length from the winding core as a non-using portion and a portion exceeding the constant length from the winding core as a using portion, and adhering the release paper 4 to the first adhesive layer 3 in a state applying a tension of ≥100 N/m to the PET film 2, when the release paper 4 is adhered to the first adhesive layer 3 formed on one side of the PET film 2.

Description

  In the double-sided pressure-sensitive adhesive tape wound around the winding core, the portion having a certain length from the winding core is a non-use portion and the portion exceeding the certain length from the winding core is a use portion, and the double-sided portion is used at the use portion. The present invention relates to a double-sided pressure-sensitive adhesive tape capable of preventing the occurrence of winding wrinkles in a polyethylene terephthalate (PET) film that is a base material of the pressure-sensitive adhesive tape.

  Conventionally, various double-sided pressure-sensitive adhesive tapes have been proposed in which a pressure-sensitive adhesive layer is formed on both surfaces of a substrate, and a release paper is attached to one pressure-sensitive adhesive layer.

  For example, in Japanese Patent Laid-Open No. 5-140520, a transfer roll is used to transfer a pressure-sensitive adhesive layer on a release paper on one side of a base material, and on the other side of the base material on a process paper via another transfer roll. A double-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer transferred thereon is described. The double-sided pressure-sensitive adhesive tape uses a base material composed of a nonwoven fabric mainly composed of hemp and transfers the pressure-sensitive adhesive layer on the release paper to the base material. At this time, the pressure-sensitive adhesive layer of the release paper is transferred by applying a tension in the longitudinal direction of the base material and extending it by 0.20 to 0.50%. In the double-sided pressure-sensitive adhesive tape manufactured as described above, wrinkles and curls can be prevented from occurring in the inner pressure-sensitive adhesive layer.

Japanese Patent Laid-Open No. 5-140520

  By the way, in general, in the double-sided pressure-sensitive adhesive tape wound around the winding core, the base material and the release paper are in close contact with each other through the adhesive layer, but are present on the outer peripheral length and the outer side of the base material existing inside. An outer circumference difference is inevitably generated between the release paper and the outer circumference of the release paper, and the outer circumference of the inner base has an extra length, so that wrinkles are generated on the inner base. End up.

  As described above, wrinkles generated on the inner base material are inevitable when the double-sided pressure-sensitive adhesive tape is wound around a winding core. There is often a possibility that wrinkles will be generated on the material side, and it is extremely difficult to completely prevent wrinkles generated on the base material side.

  The present invention has been made to solve the above-described problems in the prior art, and a portion having a certain length from the winding core is a non-use portion and a portion exceeding a certain length from the winding core is a use portion. It is an object of the present invention to provide a double-sided pressure-sensitive adhesive tape capable of preventing the occurrence of wrinkles in a polyethylene terephthalate film that becomes a base material of the double-sided pressure-sensitive adhesive tape.

  In order to achieve the above object, a double-sided pressure-sensitive adhesive tape according to claim 1 of the present application is applied with a release paper through a first pressure-sensitive adhesive layer formed on one surface of a polyethylene terephthalate film, and on the other surface of the polyethylene terephthalate film. 2 In the double-sided pressure-sensitive adhesive tape formed with the pressure-sensitive adhesive layer and wound around the core, a part having a certain length from the core is a non-use part and a part exceeding a certain length from the core is a use part, When applying release paper to the first pressure-sensitive adhesive layer formed on one surface of the polyethylene terephthalate film, the release paper is applied to the first pressure-sensitive adhesive layer with a tension of 100 N / m or more applied to the polyethylene terephthalate film. By doing so, wrinkles of the polyethylene terephthalate film are prevented from being generated in the used part.

  Here, the tension applied to the polyethylene terephthalate film is desirably 200 N / m or less.

  In the double-sided pressure-sensitive adhesive tape according to claim 1, the first portion formed on one surface of the polyethylene terephthalate film with a portion having a certain length from the core as an unused portion and a portion exceeding the certain length from the core as a used portion. When a release paper is applied to the pressure-sensitive adhesive layer, the release paper is applied to the first pressure-sensitive adhesive layer in a state where a tension of 100 N / m or more is applied to the polyethylene terephthalate film, and thus exceeds a certain length from the core. Generation | occurrence | production of the wrinkle of a polyethylene terephthalate film can be prevented in the use part of a double-sided adhesive tape.

  Here, since the tension applied to the polyethylene terephthalate film is 100 N / m or more, the outer peripheral length of the polyethylene terephthalate film present on the inner side and the outer peripheral length of the release paper present on the outer side due to the extension of the polyethylene terephthalate film. And the wrinkles can be prevented from occurring in the polyethylene terephthalate film. Even when such a double-sided pressure-sensitive adhesive tape is stored for a long period of time, there is no springback of the polyethylene terephthalate film and no wrinkles are generated.

  In addition, when the tension applied to the polyethylene terephthalate film is 100 N / m or less, the extent to which the polyethylene terephthalate film is stretched is insufficient, and the outer circumference of the polyethylene terephthalate film and the outer circumference of the release paper existing outside. The difference from the length still remains, and as a result, wrinkles may occur in the polyethylene terephthalate film.

  As described in claim 2, when the tension applied to the polyethylene terephthalate film is 200 N / m or less, the extent to which the polyethylene terephthalate film is stretched is maintained in a good range, Since there is almost no difference between the outer peripheral length and the outer peripheral length of the release paper existing outside, it is possible to prevent wrinkles from occurring in the polyethylene terephthalate film.

  In addition, when the tension applied to the polyethylene terephthalate film is 200 N / m or more, the polyethylene terephthalate film extends too much in the longitudinal direction due to the tension being too large, and the width of the polyethylene terephthalate film becomes narrow. End up. In addition, since the polyethylene terephthalate film is stretched more than necessary, when the double-sided adhesive tape is stored for a long period of time, the polyethylene terephthalate film will spring back and the release paper will sag and the first adhesive layer will peel off during travel. There is a possibility that.

It is a schematic cross section of the double-sided pressure-sensitive adhesive tape according to this embodiment. It is explanatory drawing which shows typically the manufacturing apparatus of a double-sided adhesive tape. It is a graph which shows the relationship between the tension applied to the polyethylene terephthalate film, and the tape length which the wrinkle generate | occur | produced from the winding core. It is explanatory drawing which shows typically the curl state of a tape piece after storing the tape piece which cut the double-sided adhesive tape by the predetermined length on predetermined conditions. It is a graph which shows the relationship between the curl state of a tape piece after storing the tape piece which cut the double-sided adhesive tape by predetermined length on predetermined conditions, and the tape length which the wrinkle generate | occur | produced from the winding core. It is a graph which shows the relationship between the tape length which the wrinkle generate | occur | produced from the difference of the length which measured the polyethylene terephthalate film in the double-sided adhesive tape of predetermined length, and release paper on predetermined conditions, and a core. It is a top view which shows the tape cassette in which the double-sided adhesive tape which concerns on this embodiment is used.

Hereinafter, a double-sided pressure-sensitive adhesive tape according to the present invention will be described based on embodiments embodying the present invention with reference to the drawings.
First, the structure of the double-sided pressure-sensitive adhesive tape according to this embodiment will be described with reference to FIG.
In FIG. 1, a double-sided pressure-sensitive adhesive tape 1 according to the present embodiment is basically a polyethylene terephthalate film 2 serving as a base film, and a first pressure-sensitive adhesive formed on one surface (lower surface in FIG. 1) of a polyethylene terephthalate film 2. It comprises a layer 3, a release paper 4 affixed to the first pressure-sensitive adhesive layer 3, and a second pressure-sensitive adhesive layer 5 formed on the other surface (upper surface in FIG. 1) of the polyethylene terephthalate film 1.

Here, the polyethylene terephthalate film 1 is a transparent film having a thickness of 12 μm.
The first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 5 are a mixture of a solvent-type acrylic pressure-sensitive adhesive (solid content 50%, viscosity about 5000 cps) and ethyl acetate as a diluent, as described later, polyethylene terephthalate It is formed by coating on both surfaces of the film 1. The solvent-type acrylic pressure-sensitive adhesive is mixed with 1.0 part by weight with respect to 100 parts by weight of the pressure-sensitive adhesive, and ethyl acetate is mixed with 20 parts by weight with respect to 100 parts by weight of the pressure-sensitive adhesive.
The release paper 4 is made of glassine paper having a thickness of 55 μm and silicon processed on both sides.

Then, the method to manufacture the double-sided adhesive tape 1 which concerns on a present Example is demonstrated. The double-sided adhesive tape 1 is manufactured by the manufacturing apparatus 10 shown in FIG.
In FIG. 2, the manufacturing apparatus 10 has a film supply roll 11 around which a polyethylene terephthalate film 2 is wound, and the polyethylene terephthalate film 2 is supplied from the film supply roll 11.

  A coating head 12 for applying an adhesive to one surface (lower surface in FIG. 2) of the polyethylene terephthalate film 2 supplied from the film supply roll 11 is disposed downstream of the film supply roll 11. A conveying roller 13 is provided so as to face the surface. Here, the coating head 12 is formed of a so-called die coater, and by adjusting the gap of the die coater, the pressure-sensitive adhesive is formed so that the thickness of the first pressure-sensitive adhesive layer 3 formed after drying becomes 20 μm. Is formed by coating.

  A transport roller 14 that changes the transport direction of the polyethylene terephthalate film 2 is disposed downstream of the coating head 12 and the transport roller 13, and a drying furnace 15 is disposed downstream of the transport roller 14. The temperature in the drying furnace 15 is set to 100 ° C. at the maximum. The polyethylene terephthalate film 2 whose conveyance direction has been changed via the conveyance roller 14 is carried into the drying furnace 15, so that the adhesive applied to one surface of the polyethylene terephthalate film 2 passes through the drying furnace 15. To be a first pressure-sensitive adhesive layer 3 having a thickness of 20 μm.

Downstream of the drying furnace 15, conveying rollers 16 and 17 and a pair of laminating rollers 18 and 18 are disposed. The polyethylene terephthalate film 2 dried in the drying furnace 15 is conveyed in the conveying direction by the conveying rollers 16 and 17. Is supplied to the laminating rollers 18 and 18 while being changed. At this time, the conveying speed of the polyethylene terephthalate film 2 by the laminating rollers 18 and 18 is set to be larger than the conveying speed of the conveying roller 17, and thereby tension is applied to the polyethylene terephthalate film 2. Such tension can be changed in a plurality of stages by variously adjusting the rotational speed of the laminating rollers 18 and 18 and the rotational speed of the conveying roller 17.
Various methods can be adopted for applying tension to the polyethylene terephthalate film 2 in a plurality of stages.

  Further, a release paper supply roll 19 around which the release paper 4 is wound is disposed adjacent to each of the laminating rollers 18, 18, and the release paper 4 is supplied from the release paper supply roll 19 to each of the laminating rollers 18, 18. Supplied in between.

  As described above, the polyethylene terephthalate film 2 is supplied to the laminating rollers 18 and 18 while being applied with tension, and at the same time, the release paper 4 is supplied from the release paper supply roll 19 to the laminating rollers 18 and 18. As a result, the first adhesive layer 3 of the polyethylene terephthalate film 2 and the release paper 4 are laminated to each other between the laminating rollers 18 and 18.

  As described above, the tape with release paper in which the release paper 4 is laminated on one surface of the polyethylene terephthalate film 2 through the first pressure-sensitive adhesive layer 3 is a winding roll 20 disposed downstream of each laminating roller 18, 18. It will be wound around.

Through the above process, a release paper tape is manufactured by laminating the release paper 4 to the first pressure-sensitive adhesive layer 3 formed on one surface of the polyethylene terephthalate film 2. The second pressure-sensitive adhesive layer 5 is applied and formed on the surface opposite to the surface on which the first pressure-sensitive adhesive layer 3 is formed.
Here, the coating formation of the second pressure-sensitive adhesive layer 5 can be performed using the manufacturing apparatus 10. For example, instead of the film supply roll 11, the take-up roll 20 on which the tape with release paper is wound is arranged so that the surface opposite to the first adhesive layer 3 in the tape with release paper faces the coating head 12. The adhesive is applied and formed on the surface opposite to the first adhesive layer 3 through the coating head 12 so as to have a thickness of 20 μm after drying, and is supplied to the drying furnace 15 by the supply rollers 13 and 14. After the second pressure-sensitive adhesive layer 5 is formed by drying the pressure-sensitive adhesive, the second pressure-sensitive adhesive layer 5 is wound around a winding roll prepared separately by the supply rollers 16 and 17 and the laminating rollers 18 and 18. Thereby, the double-sided pressure-sensitive adhesive tape 1 in which the release paper 4 is laminated on one surface of the polyethylene terephthalate film 2 via the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 5 is formed on the other surface can be produced.

The double-sided pressure-sensitive adhesive tape 1 manufactured as described above is generally manufactured on a scale having a tape width of 1000 mm and a winding length of 1000 m, and this is a raw fabric of the double-sided pressure-sensitive adhesive tape. The original fabric of the double-sided pressure-sensitive adhesive tape thus manufactured is aged at a temperature of 40 degrees for 48 hours.
The original fabric is cut with a tape width of 36 to 6 mm, and a middle volume of a double-sided pressure-sensitive adhesive tape having an intermediate size wound around a winding length of about 1000 m is formed.
Further, from the middle volume of the double-sided pressure-sensitive adhesive tape, a small volume of double-sided tape wound about 9 m on a core having a tape width of 36 to 6 mm (same tape width as the middle volume) and an outer diameter of 12 mm is formed.
The double-sided pressure-sensitive adhesive tape roll formed in this way is used by being incorporated in a tape cassette used in a tape printer to be described later.

  When the double-sided pressure-sensitive adhesive tape 1 is wound around the core to form a small volume, the second pressure-sensitive adhesive layer 5 is wound inside the core and the release paper 4 is wound outside. However, there is a tendency that wrinkles are generated in the polyethylene terephthalate film 2 due to a difference in inner and outer circumference between the outer peripheral length of the polyethylene terephthalate film 2 and the outer peripheral length of the release paper 4. When such wrinkles are generated, the adhesive performance of the double-sided pressure-sensitive adhesive tape is lowered at the wrinkled portion, and the aesthetic appearance is also impaired when the double-sided pressure-sensitive adhesive tape 1 is used in a visible state.

  On the other hand, as described above, while applying tension to the polyethylene terephthalate film 2, the first adhesive layer 3 is laminated with the release paper 4, and the medium is wound through the middle volume of the double-sided pressure-sensitive adhesive tape 1. If the double-sided pressure-sensitive adhesive tape 1 is wound around a winding core, the difference between the inner and outer periphery generated between the outer peripheral length of the polyethylene terephthalate film 2 and the outer peripheral length of the release paper 4 is absorbed, and wrinkles are generated to some extent. It is also known that it can be suppressed.

  Therefore, when the raw material of the double-sided pressure-sensitive adhesive tape 1 is manufactured, six raw materials manufactured by changing various tensions applied to the polyethylene terephthalate film 2 when laminating the first pressure-sensitive adhesive layer 3 and the release paper 4 are manufactured. An experiment to make six small rolls A to F from each of the opposite sides and examine the relationship between the tension applied to the polyethylene terephthalate film 2 during the production of the original fabric and the position of wrinkles generated in each of the small rolls A to F Went. The experimental results are shown in the graph of FIG.

  In the graph of FIG. 3, the horizontal axis indicates the value of tension (N / m) per tape width applied to the polyethylene terephthalate film 2 during lamination with the release paper 4 in the production of the original fabric, and the vertical axis indicates the winding in the small volume. The tape length (cm) from the core to the wrinkles generated at the outermost periphery of the double-sided pressure-sensitive adhesive tape is shown.

  Here, of the double-sided pressure-sensitive adhesive tape wound in a small volume, the part 100 cm from the core is regarded as an unused part, and the part exceeding 100 cm from the core is regarded as a part used as the double-sided adhesive tape 1. ing.

  In addition, the point A shown in the graph of FIG. 3 is to create an original fabric in which a tension of 83.1 N / m is applied to the polyethylene terephthalate film 2 and to make 20 samples of the small volume A from the original fabric. The average value of the tape length from the winding core until wrinkles are generated is shown. Similarly, at point B, an original fabric in which a tension of 91.4 N / m is applied to the polyethylene terephthalate film 2 is prepared, and 20 samples of the small roll B are prepared from the original fabric, and wrinkles are generated from the core. The average value of the tape length is calculated and shown. Similarly, at the point C, an original fabric in which a tension of 99.7 N / m is applied to the polyethylene terephthalate fill 2 is prepared, and 20 samples of the small volume C are prepared from the original fabric, and wrinkles are generated from the core. The average value of the tape length is calculated and shown. Similarly, at the point D, an original fabric in which a tension of 116.3 N / m is applied to the polyethylene terephthalate fill 2 is prepared, and 20 samples of the small volume D are prepared from the original fabric, and wrinkles are generated from the core. The average value of the tape length is calculated and shown. Similarly, at the point E, a raw fabric in which a tension of 132.9 N / m is applied to the polyethylene terephthalate fill 2 is created, and 20 small-volume E samples are created from the raw fabric, and wrinkles are generated from the core. The average value of the tape length is calculated and shown. Similarly, at the point F, a raw fabric in which a tension of 149.5 N / m is applied to the polyethylene terephthalate fill 2 is prepared, and 20 samples of the small winding F are prepared from the original fabric, and wrinkles are generated from the core. The average value of the tape length is calculated and shown.

  In the graph of FIG. 3, the wrinkle is generated at the point A corresponding to the small roll A at a position of 118.4 cm from the core when the tension applied to the polyethylene terephthalate film 2 is as low as 83.1 N / m. In such a case, wrinkles will occur in the used part of the double-sided pressure-sensitive adhesive tape 1. When a small roll is produced from the raw material manufactured in this way and used as the double-sided pressure-sensitive adhesive tape 1, the above-described problems occur.

  B point corresponding to the small winding B indicates that when the tension applied to the polyethylene terephthalate film 2 is 91.4 N / m, wrinkles are generated at a position of 101.3 cm from the winding core. In this case, wrinkles are generated at the boundary between the unused portion and the used portion of the double-sided pressure-sensitive adhesive tape 1. Even if a small roll is made from the raw material thus manufactured and used as the double-sided pressure-sensitive adhesive tape 1, no remarkable problem occurs, but it is better not to use it as the double-sided pressure-sensitive adhesive tape 1.

  The point C corresponding to the small volume C indicates that when the tension applied to the polyethylene terephthalate film 2 is 99.7 N / m, wrinkles are generated at a position of 79.9 cm from the core. In this case, since wrinkles are generated only in the unused portion, even if the small roll prepared from the raw material manufactured in this way is used as the double-sided pressure-sensitive adhesive tape 1, no problem occurs.

  The point D corresponding to the small volume D indicates that when the tension applied to the polyethylene terephthalate film 2 is 116.3 N / m, wrinkles are generated at a position of 57.4 cm from the core. In this case, wrinkles are generated only in the unused portion. Therefore, even if the small roll prepared using the raw fabric manufactured in this way is used as the double-sided adhesive tape 1, no problem occurs.

  The E point corresponding to the small volume E indicates that when the tension applied to the polyethylene terephthalate film 2 is 132.9 N / m, wrinkles are generated at a position 39.4 cm from the core. In this case, since wrinkles are generated only in the unused portion, even if the small roll prepared from the raw material manufactured in this way is used as the double-sided pressure-sensitive adhesive tape 1, no problem occurs.

  The F point corresponding to the small winding F indicates that when the tension applied to the polyethylene terephthalate film 2 is 149.5 N / m, wrinkles are generated at a position of 29.4 cm from the winding core. In this case, since wrinkles are generated only in the unused portion, even if the small roll prepared from the raw material manufactured in this way is used as the double-sided pressure-sensitive adhesive tape 1, no problem occurs.

From the above, the tension applied to the polyethylene terephthalate film 2 when laminating the polyethylene terephthalate film 2 and the release paper 4 is 99.7 N / m or more, for example, 100 N / m or more. If it exists, it can prevent reliably that a wrinkle generate | occur | produces in the use part exceeding 100 cm from a core in the small volume produced from this original fabric.
In addition, when the tension applied to the polyethylene terephthalate film 2 is 200 N / m or less, the extent to which the polyethylene terephthalate film 2 is stretched is maintained in a good range, and exists on the outer peripheral length and outside of the polyethylene terephthalate film 2. Since the difference with the outer peripheral length of the release paper 4 to be eliminated is almost eliminated, the polyethylene terephthalate film 2 can be prevented from wrinkling at the portion where the double-sided adhesive tape is used. On the other hand, when the tension applied to the polyethylene terephthalate film 2 exceeds 200 N / m, the polyethylene terephthalate film 2 is excessively stretched, and when the double-sided pressure-sensitive adhesive tape 1 is stored for a long time, a springback of the polyethylene terephthalate film 2 occurs. As a result, the release paper 4 sags and the release paper 4 and the first pressure-sensitive adhesive layer 3 are peeled off during traveling.

  Subsequently, the curled state when the double-sided pressure-sensitive adhesive tape 1 unwound and peeled off from each of the small volumes A to F prepared as described above was stored under the following conditions was examined.

  First, curl measurement conditions will be described. The double-sided pressure-sensitive adhesive tape was unwound from the winding core in each of the small windings A to F, peeled off, and cut at a predetermined length (for example, 20 cm) to create tape pieces A to F. Next, each tape piece A to F was stored for 24 hours in an atmosphere at a temperature of 23 ° C. and a humidity of 50%. The curled state of each of the tape pieces A to F in this state is shown in FIG.

In FIG. 4, the tape piece A is obtained from a small roll A formed by applying a tension of 83.1 N / m to the polyethylene terephthalate film 2, and since the tension is low, the curled state of the tape piece A Is open and its curl outer diameter is large.
The tape piece B was obtained from a small roll B formed by applying a tension of 91.4 N / m to the polyethylene terephthalate film 2, and its curled outer diameter is smaller than that of the tape piece A.
The tape piece C is obtained from a small roll C formed by applying a tension of 99.7 N / m to the polyethylene terephthalate film 2, and its curled outer diameter is smaller than that of the tape piece B.
The tape piece D is obtained from a small volume D formed by applying a tension of 116.3 N / m to the polyethylene terephthalate film 2, and its curled outer diameter is smaller than that of the tape piece C.
The tape piece E is obtained from a small volume E formed by applying a tension of 132.9 N / m to the polyethylene terephthalate film 2, and its curled outer diameter is smaller than that of the tape piece D.
The tape piece F was obtained from a small volume F formed by applying a tension of 149.5 N / m to the polyethylene terephthalate film 2, and its curled outer diameter is smaller than that of the tape piece E.
As is clear from the above, as the tension applied to the polyethylene terephthalate film 2 when laminating the polyethylene terephthalate film 2 and the release paper 4 during the production of the original fabric increases, the curl outer diameter of each tape piece decreases. To go.

  And while taking a photograph so that the curled state of each tape piece A-F becomes clear, the photograph data of each tape piece A-F is taken in to a personal computer, and it displays on a display, Each tape piece A-F The curled outlines of the tape pieces A to F were determined by drawing a circle corresponding to the curled arc on the display. In addition, the curl outer diameter value of each tape piece A-F produced three samples for each tape piece A-F, and calculated the average value. The measurement results are shown in the graph of FIG.

  In the graph of FIG. 5, the horizontal axis indicates the value (mm) of the curl outer diameter measured for each tape piece A to F, and the vertical axis indicates both sides from the core in the small volume A to F as in the graph of FIG. 3. The tape length (cm) to the wrinkle which generate | occur | produced in the outermost periphery of the adhesive tape 1 is shown.

  In the graph of FIG. 5, the point A corresponding to the tape piece A formed from the small roll A is wrinkled at a position of 118.4 cm from the core when the tape piece A has a large curl outer diameter of 121.0 mm. In such a case, wrinkles will occur at the portion where the double-sided pressure-sensitive adhesive tape 1 is used. When wrinkles occur in the used part in this way, the adhesive performance of the double-sided pressure-sensitive adhesive tape is lowered at the wrinkled part, and the aesthetic appearance is also impaired when the double-sided pressure-sensitive adhesive tape 1 is used in a visible state.

  The point B corresponding to the tape piece B formed from the small roll B indicates that when the curl outer diameter is 113.0 mm, wrinkles are generated at a position of 101.3 cm from the winding core. Will cause wrinkles at the boundary between the unused portion and the used portion of the double-sided pressure-sensitive adhesive tape 1. In this case, even if the small roll B is used as the double-sided pressure-sensitive adhesive tape 1, no remarkable problem occurs, but it is better not to use it as the double-sided pressure-sensitive adhesive tape 1.

  The point C corresponding to the tape piece C formed from the small volume C indicates that wrinkles are generated at a position of 79.9 cm from the core when the curl outer diameter is 98.0 mm. Since wrinkles are generated only in the unused portion, even if the small roll C is used as the double-sided pressure-sensitive adhesive tape 1, no problem occurs.

  The point D corresponding to the tape piece D formed from the small volume D indicates that when the curl outer diameter is 94.0, wrinkles are generated at a position 57.4 cm from the winding core. Since wrinkles are generated only in the unused portion, no problem occurs even if the small roll D is used as the double-sided adhesive tape 1.

  The E point corresponding to the tape piece E formed from the small winding E indicates that when the curl outer diameter is 89.0 mm, wrinkles are generated at a position 39.4 cm from the winding core. In this case, since wrinkles are generated only in the unused portion, no problem occurs even if the small roll E is used as the double-sided adhesive tape 1.

  F point corresponding to the tape piece F formed from the small winding F indicates that wrinkles occur at a position of 29.4 cm from the winding core when the curl outer diameter is 71.0 mm. In this case, since wrinkles are generated only in the unused portion, no problem occurs even if the small roll F is used as the double-sided adhesive tape 1.

From the above, if the curl outer diameter measured under the above-mentioned predetermined conditions for each tape piece A to F is 113 mm or less, for example, 110 mm or less, the wrinkles will be wrinkled in the use part exceeding 100 cm from the core in each small roll. Can be reliably prevented from occurring.
When the curled outer diameter is 50 mm or more, the curvature of the double-sided adhesive tape is maintained in a good state, and there is almost no difference between the outer peripheral length of the polyethylene terephthalate film 2 and the outer peripheral length of the release paper 4 existing outside. Since there is no wrinkle, wrinkles can be prevented from occurring in the used part of the polyethylene terephthalate film 2. On the other hand, when the curl outer diameter is 50 mm or less, the curvature of the double-sided pressure-sensitive adhesive tape 1 becomes too large and the polyethylene terephthalate film 2 expands too much. As a result, the release paper 4 sags and the release paper 4 and the first pressure-sensitive adhesive layer 3 are peeled off during traveling.

  Subsequently, in consideration of the occurrence of wrinkling of the polyethylene terephthalate film 4 in the double-sided adhesive tape 1 due to the difference between the outer circumference of the release paper 4 and the outer circumference of the polyethylene terephthalate film 2, The relationship between the difference between the inner and outer circumferences (mm: difference in length between the polyethylene terephthalate film 2 and the release paper 4) and the tape length (cm) until wrinkles are generated from the winding core in each of the small windings A to F is investigated. It was.

  Here, a method for measuring the difference in length between the polyethylene terephthalate film 2 and the release paper 4 will be described. First, the double-sided pressure-sensitive adhesive tape 1 is pulled out by 5 m or more from each of the small rolls A to F, and two cuts are formed on the double-sided pressure-sensitive adhesive tape 1 so that the distance between the two locations is 5 m. Thereafter, the polyethylene terephthalate film 2 and the release paper 4 are peeled from each double-sided pressure-sensitive adhesive tape 1 to fix one end of each of the polyethylene terephthalate film 2 and the release paper 4 and suspend a 10 g weight on the other end. And while measuring the length between the two notches in the polyethylene terephthalate film 2 and the release paper 4, the difference between the two is calculated. The length difference between the polyethylene terephthalate film 2 and the release paper 4 was obtained by forming three samples for each of the small rolls A to F and calculating the average value. The measurement results are shown in the graph of FIG.

  In the graph of FIG. 6, the horizontal axis indicates the difference in length (mm / 5 m) between the polyethylene terephthalate film 2 and the release paper 4 for the double-sided pressure-sensitive adhesive tape 1 wound in each of the small volumes A to F, and the vertical axis indicates the figure. The tape length (cm) from the winding core to the wrinkle which generate | occur | produced in the outermost periphery of a double-sided adhesive tape in small volume A-F similarly to the graph of 3 is shown.

  In the graph of FIG. 6, the point A corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided adhesive tape 1 drawn out from the small roll A is when the difference in length is as small as 0.177 mm. Indicates that wrinkles are generated at a position of 118.4 cm from the winding core. In such a case, wrinkles are generated in the used portion of the double-sided pressure-sensitive adhesive tape 1. Thus, when wrinkles occur in the used part, the adhesive performance of the double-sided pressure-sensitive adhesive tape deteriorates at the wrinkled part, and the aesthetic appearance is also impaired when the double-sided pressure-sensitive adhesive tape is used in a visible state.

  The point B corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided pressure-sensitive adhesive tape 1 drawn out from the small roll B is 101 from the core when the difference in length is 0.206 mm. This indicates that wrinkles are generated at a position of 3 cm. In such a case, wrinkles are generated at the boundary between the unused portion and the used portion of the double-sided pressure-sensitive adhesive tape 1. In this case, even if the small roll B is used as the double-sided pressure-sensitive adhesive tape 1, no remarkable problem occurs, but it is better not to use it as the double-sided pressure-sensitive adhesive tape 1.

  The point C corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided pressure-sensitive adhesive tape 1 drawn out from the small roll C is 79 from the winding core when the difference in length is 0.240 mm. This indicates that wrinkles are generated at a position of .9 cm. In such a case, wrinkles are generated only in the unused portion, so that no trouble occurs even if the small roll C is used as the double-sided adhesive tape 1.

  The point D corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided adhesive tape 1 drawn out from the small roll D is 57 from the winding core when the difference in length is 0.258 mm. This indicates that wrinkles are generated at a position of 4 cm. In such a case, the wrinkles are generated only in the unused portion, so that no trouble occurs even if the small roll D is used as the double-sided adhesive tape 1.

  The point E corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided pressure-sensitive adhesive tape 1 drawn out from the small roll E is 39 from the core when the difference in length is 0.291 mm. This indicates that wrinkles are generated at a position of 4 cm. In such a case, wrinkles are generated only in the unused portion, so that no problem occurs even if the small roll E is used as the double-sided adhesive tape 1.

  The point F corresponding to the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided adhesive tape 1 drawn out from the small roll F is 29 from the winding core when the difference in length is 0.346 mm. This indicates that wrinkles are generated at a position of 4 cm. In such a case, the wrinkles are generated only in the unused portion, so that no trouble occurs even if the small roll F is used as the double-sided adhesive tape 1.

  From the above, if the difference in length between the polyethylene terephthalate film 2 and the release paper 4 of the double-sided pressure-sensitive adhesive tape 1 drawn from each of the small volumes A to F is 0.206 mm or more, for example, 0.21 mm or more, In each of the small windings A to F, wrinkles can be reliably prevented from occurring in a portion of use exceeding 100 cm from the core.

  In addition, when the difference in length between the polyethylene terephthalate film 2 and the release paper 4 is 0.35 mm or less, the difference in length between the two is maintained in a favorable range, and the outer peripheral length and the outer side of the polyethylene terephthalate film 2 are maintained. Since the difference with the outer peripheral length of the release paper 4 existing in the sheet is almost eliminated, the polyethylene terephthalate film 2 can be prevented from being wrinkled at the used portion of the double-sided pressure-sensitive adhesive tape 1. On the other hand, when the difference in length between the polyethylene terephthalate film 2 and the release paper 4 is 0.35 mm or more, the polyethylene terephthalate film 2 is excessively stretched. Springback occurs and as a result, the release paper 4 sags and the release paper 4 and the first pressure-sensitive adhesive layer 3 are peeled off during traveling.

Each small roll of the double-sided pressure-sensitive adhesive tape 1 configured as described above is used in a tape cassette shown in FIG.
Here, a tape cassette in which a small volume of the double-sided pressure-sensitive adhesive tape 1 is used will be described with reference to FIG.

  As shown in FIG. 7, the tape cassette CS is detachably mounted on a cassette mounting portion provided in a tape printer (not shown), and a transparent printing tape 30 is mounted on the tape cassette CS. A tape spool 31 on which is wound, an ink ribbon 32 in which ink that is melted by heating is applied to a base film, a take-up spool 33 that winds up the ink ribbon 32, and both sides that have the same width as the print tape 30 Supply spool 34 in which adhesive tape 1 is wound with release paper facing outside (the supply spool corresponds to a winding core, and the entire double-sided adhesive tape 1 wound around the supply spool and the supply spool corresponds to a small volume) And the joining roller 35 which joins and laminates the printing tape 30 and the double-sided adhesive tape 1 is rotatably arrange | positioned.

  The double-sided pressure-sensitive adhesive tape 1 has a polyethylene terephthalate film 2 to be a base film and a first pressure-sensitive adhesive layer 3 formed on one surface (the lower surface in FIG. 1) as a base film, as described in FIG. The release paper 4 stuck to the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 5 formed on the other surface (upper surface in FIG. 1) of the polyethylene terephthalate film 1 are formed.

  At the position where the print tape 30 and the ink ribbon 32 overlap, a thermal head 36 disposed in the cassette mounting portion of the tape printer is erected, and the print tape 30 and the ink ribbon are disposed on the tape printer side. 32 are pressed against the thermal head 36, and a feed roller 39 that presses the printing tape 30 and the double-sided adhesive tape 1 against the joining roller 35 to produce a tape with letters 38 is provided on the tape printer side. It is pivotally supported by the support body 40 pivotally attached. On the thermal head 36, a heating element group (not shown) composed of 128 heating elements is arranged in a vertical direction (perpendicular to the paper surface).

  In the above-described configuration, the heating roller group and the take-up spool 33 are driven in synchronization with each other in a predetermined rotation direction by driving a tape feeding motor (not shown) in a predetermined rotation direction, and the heating element group is energized, The heating element generates heat and heats the ink ribbon 32. By this heating, the ink applied to the ink ribbon 32 is melted, and characters and the like are thermally transferred onto the printing tape 30. Further, the second pressure-sensitive adhesive layer 5 of the double-sided pressure-sensitive adhesive tape 1 is laminated on the print surface of characters or the like on the print tape 30 via the joining roller 35 and the feed roller 39, and in this state the character-attached tape 38 is attached. Are fed along the tape feeding direction A.

  Note that the present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Double-sided adhesive tape 2 Polyethylene terephthalate film 3 1st adhesive layer 4 Release paper 5 2nd adhesive layer

Claims (2)

Double-sided pressure-sensitive adhesive tape on which a release paper is affixed via a first pressure-sensitive adhesive layer formed on one surface of a polyethylene terephthalate film and a second pressure-sensitive adhesive layer is formed on the other surface of the polyethylene terephthalate film and is wound around a core In
A part having a certain length from the core is a non-use part and a part exceeding a certain length from the core is a use part,
When applying release paper to the first pressure-sensitive adhesive layer formed on one surface of the polyethylene terephthalate film, the release paper is applied to the first pressure-sensitive adhesive layer with a tension of 100 N / m or more applied to the polyethylene terephthalate film. By doing so, generation of wrinkles of the polyethylene terephthalate film is prevented at the used part.   The double-sided pressure-sensitive adhesive tape according to claim 1, wherein a tension applied to the polyethylene terephthalate film is 200 N / m or less.

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