JP2020168715A - Slitting device, slitting method, and laminated tape - Google Patents

Abstract

To provide a slitting device that enables a laminated film, obtained by peelably laminating an adhesive layer onto a base film, to be slit to a tape width of 0.5 mm or less such that peeling of the base film and the adhesive layer does not occur and such that the adhesive layer does not protrude outward.SOLUTION: A carrier film 4 and a film 3, obtained by peelably laminating an adhesive layer onto a base film, are passed overlapping between a bladed roller 10, provided with a plurality of disk-shaped slitting blades 11 at a pitch p of 0.5 mm or less, and an anvil roller 20, with the film 3 on the bladed roller 10 side, and the film 3 is slit by score cutting. A blade angle α of the slitting blades 11 is 30° or less.SELECTED DRAWING: Figure 2

Description

The present invention relates to a laminated film slit device in which an adhesive layer is detachably laminated on a base film, a slit method, and a laminated tape obtained by slitting the laminated film.

A long laminated tape in which an adhesive layer is detachably laminated on a base film is used as a transfer ribbon or the like for transferring figures, characters, etc. to an article (Patent Document 1). Such a laminated tape is manufactured by slitting a laminated film in which an adhesive layer is detachably laminated on a base film.

A long laminated tape in which an adhesive layer is detachably laminated on a base film is also used as an adhesive when mounting electronic components on a substrate, and in recent years, a narrow laminated tape has been required. ing. However, when the laminated film in which the adhesive layer is releasably laminated on the base film is slit in a narrow width, there arises a problem that the base film and the adhesive layer are peeled off by the slit. In response to this, the entire device that slits the laminated film using a share-cut method that uses a disk-shaped upper and lower blades is covered with a hood to suppress temperature fluctuations from the slitting of the laminated film to the winding. There is a large-scale method (Patent Document 2). According to this method, it is said that the laminated film can be slit into a narrow tape width of 0.5 mm to 4 mm.

On the other hand, in the share cut method using the upper blade and the lower blade, there is a possibility that fine abrasion powder of the blade generated by the contact between the upper blade and the lower blade adheres to the tape after the slit. On the other hand, in the score cut method using a bladed roll and an anvil roll as a slit method that does not generate such abrasion powder and can alleviate the machining accuracy of the blade required to obtain a clean cut surface. , There is a method of slitting a film to be slit together with a carrier film (underlay material) (Patent Document 3).

Japanese Unexamined Patent Publication No. 2012-23392 JP-A-2007-90461 Japanese Unexamined Patent Publication No. 2003-285293

According to the method described in Patent Document 2, it is said that a narrow tape obtained by slitting a laminated film to a width of 0.5 mm can be obtained, but details for slitting a long tape with a narrow width of 0.5 mm or less. No consideration has been given. Further, the problem of peeling between the base material and the adhesive layer described in Patent Document 2 is more likely to occur as the film becomes narrower. Therefore, there is a concern that the non-defective rate of products may decrease for narrow tapes with a width of 0.5 mm or less.

According to the description of Patent Document 3, it is possible to slit a polyester film to a width of 2 mm by using a roll with a blade having a blade angle of 70 °. However, even with the method described in Patent Document 3, if an attempt is made to slit a laminated film in which an adhesive layer is releasably laminated on a base film to a tape width of 0.5 mm or less, the pitch of the blades in the bladed roll becomes narrow. As a result, the surface of the slit laminated film on the intruding side of the blade is compressed more strongly in the slit width direction than the surface on the opposite side, causing problems such as peeling and protrusion of the adhesive layer.

On the other hand, in the present invention, the laminated film in which the adhesive layer is releasably laminated on the base film has a clean cut end in which the base film and the adhesive layer do not peel off and the adhesive layer does not protrude, and the tape width is 0. The object is to slit to 5.5 mm or less, especially less than 0.5 mm.

The present inventor uses a carrier film in a score-cut type slit device that uses a roll with a blade and an anvil roll, and when the slit blade of the roll with a blade has a specific blade angle, the pitch of the slit blade in the roll with a blade Even if the thickness is 0.5 mm or less, particularly less than 0.5 mm, the laminated film in which the adhesive layer is releasably laminated on the base film can be slit without peeling the base film and the adhesive layer. The present invention was completed with the idea that the protrusion of the adhesive layer from the slit tape can be suppressed.

That is, the present invention is a slitting device including a bladed roll and anvil roll in which a plurality of disc-shaped slit blades are provided at a predetermined pitch and slits a film by a score cut method. The slitting film and anvil roll It has a carrier film transport mechanism that interposes a carrier film between the and
The blade angle of the slit blade is 30 ° or less,
Provided is a slit device having a slit blade pitch of 0.5 mm or less.

Further, according to the present invention, a laminated film and a carrier film in which an adhesive layer is releasably laminated on a base film between a bladed roll and an anvil roll in which a plurality of disc-shaped slit blades are provided at a predetermined pitch. This is a score-cut type slit method in which the laminated film is placed on the roll side with a blade and passed through the laminated film to slit the laminated film.
Set the blade angle of the slit blade to 30 ° or less.
Provided is a slit method in which the pitch of the slit blade is 0.5 mm or less.

Further, the present invention provides a laminated tape obtained by slitting a laminated film in which an adhesive layer is releasably laminated on a base film by the above-mentioned slit method. Further, it is a laminated tape in which an adhesive layer is detachably laminated on a base film, and one end of the laminated tape having a tape width of 0.5 mm or less and a length of 1 m is fixed, and 1N is fixed to the other end. Provided is a laminated tape in which the base film and the adhesive layer do not peel off when tension is applied.

When a laminated film in which an adhesive layer is detachably laminated on a base film is slit by the slit method of the present invention using the slit device of the present invention, a laminated tape having a width of 0.5 mm or less, particularly a width of less than 0.5 mm. Can be obtained without the base film and the adhesive layer peeling off. Even if a tape having a length of 1 m is arbitrarily cut from this laminated tape, one end of the tape is fixed, and a tension of 0.5 N, preferably 1 N, more preferably 5 N is applied to the other end, the base film and the adhesive layer are formed. Does not peel off. Therefore, even if this laminated tape is wound on a reel to form a wound body and pulled out from the wound body for use, the base film and the adhesive layer do not peel off depending on the tension at the time of winding or pulling out. Further, in the wound body of this laminated tape, the adhesive layer does not protrude. Therefore, it is possible to prevent blocking from occurring when the wound body is used. Therefore, this laminated tape is useful as a narrow adhesive material for attaching an adhesive layer to an article, and when the adhesive layer is formed from a curable resin composition, it is also useful as an adhesive material.

FIG. 1 is a schematic perspective view of the slit device of the embodiment. FIG. 2 is a side view of the vicinity of the arrangement region of the slit blades (cutting blades) of the slit device that slits the laminated film. FIG. 3A is a cross-sectional view showing an assembled structure of a bladed roll and an anvil roll of the apparatus of the embodiment. FIG. 3B is a cross-sectional view showing a modified mode of the assembled structure of the bladed roll and the anvil roll. FIG. 3C is a cross-sectional view showing a modified mode of the assembled structure of the bladed roll and the anvil roll. FIG. 4 is an enlarged cross-sectional view of a slit blade portion when the laminated film is slit by the slit blade of the apparatus of the embodiment. FIG. 5 is an enlarged cross-sectional view of a slit blade portion when a laminated film in which laminated films are joined in the longitudinal direction is slit with a connecting tape. FIG. 6 is an enlarged cross-sectional view of a slit blade portion when the laminated film is slit with a slit blade having a blade angle of 70 °.

Hereinafter, the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals represent the same or equivalent components.

<Overall configuration of slit device>
FIG. 1 is a schematic perspective view of a slit device 1 according to an embodiment of the present invention, and FIG. 2 is a side view of the vicinity of an arrangement region of slit blades when the film 3 is slit by the slit device 1.

As shown in FIG. 2, the slit device 1 has a bladed roll 10 having a region 13 in which a disk-shaped slit blade 11 is arranged on a cylindrical roll 12 at a predetermined pitch in the rotation axis L1 direction of the roll 12. It is a device that includes a cylindrical anvil roll 20 and slits the film 3 by a score cut method. In the share cut method, the upper blade and the lower blade come into contact with each other, whereas in the score cut method, there is no contact between the blades, so that the life of the blade can be extended.

The slit device 1 is provided with a film unwinding device 2 and a winding device (not shown) as a transport mechanism for passing the slit film 3 between the bladed roll 10 and the anvil roll 20. The winding device includes a winding device that winds an even-numbered row of tape 3a and an odd-numbered row of tape 3b so that adjacent tapes of the plurality of rows of tape obtained by slitting the film are wound in different directions. Each can have a winding device for winding. In FIG. 1, the even-numbered rows of tape 3a are wound upward and the odd-numbered rows of tape 3b are wound downward. However, the even-numbered rows of tape are wound downward and the odd-numbered rows of tape 3b are wound downward. The tape may be wound up.

The slit device 1 has a carrier film unwinding device 5 and a pair of laminates in which the carrier film 4 is overlapped with the film 3 as a carrier film transport mechanism for interposing the carrier film 4 between the slit film 3 and the anvil roll 20. A carrier film winding portion (not shown) is provided which winds the roll 6 together with the end portion (film ear) of the film after the slit and the carrier film 4.

As will be described later, in this slit device 1, the slit film 3 is not only a single-layer resin film or a laminated film in which a plurality of resin layers are adhered or welded, but also an adhesive layer 32 is formed on a base film 31. Even the laminated film 30 (FIG. 4) that is detachably laminated can be slit to a width of 0.5 mm or less, particularly a width of less than 0.5 mm.

<Slit blade>
The slit blade 11 provided on the bladed roll 10 is preferably double-edged from the viewpoint of stabilizing the slit direction. When the slit blade is single-edged (that is, one of the two blade surfaces forming the cutting edge is a flat surface and the other is a hoe surface), the force in the film width direction applied to the slit blade at the time of slitting is more than the flat surface. Since the film becomes large on the surface and the film is bent and conveyed in the ho side direction, it becomes necessary to widen the margin in the width direction of the slit film, and the amount of waste at the edge of the film also increases. On the other hand, by using double-edged blades, the force in the film width direction applied to the slit blade at the time of slitting becomes equal on both side surfaces of the blade, so that the film transport direction can be prevented from bending and the amount of waste at the film end can be reduced. Can be done.

The blade angle α of the slit blade 11 is such that the base film and the adhesive layer are formed in a narrow width of 0.5 mm or less, particularly less than 0.5 mm, in which a laminated film having an adhesive layer that can be peeled off is provided on the base film. It is preferably 30 ° or less, and particularly preferably 25 ° or less, from the viewpoint of allowing slitting without peeling. On the other hand, from the viewpoint of durability of the slit blade, the blade angle α is preferably 10 ° or more.

The pitch p of the slit blade 11 is determined according to the tape width required for the tape obtained by slitting the film 3, but in the present invention, the upper limit is 0.5 mm or less so as to correspond to a narrow tape. In particular, it may be less than 0.5 mm and further 0.4 mm or less. The lower limit is preferably 0.1 mm or more.

The blade height h of the slit blade of the slit blade 11 is preferably high from the viewpoint of stabilizing the slit accuracy, and the lower limit is preferably 0.05 mm or more, more preferably 0.1 mm or more, still more preferably 0.24 mm. That's all. On the other hand, the blade height h of the slit blade is preferably low from the viewpoint of durability of the slit blade, and the upper limit is preferably 0.8 mm or less, more preferably 0.7 mm or less, still more preferably 0.5 mm or less. Is.

As described in Patent Document 3, when the blade angle α of the slit blade is 70 °, when the pitch is 0.5 mm or less, the laminated film in which the adhesive layer is releasably laminated on the base film is slit. Then, as shown in FIG. 6, the laminated film 30 is laminated even if the adhesive layer 32 and the cover film 33 are sequentially provided on the base film 31 and the adhesive layer 32 is not exposed on the film surface. The surface of the film 30 on the entry side of the slit blade 11 receives a stronger compressive force F in the slit width direction than the surface on the opposite side. Therefore, in the tape after slitting, there are problems that the base film 31 or the cover film 33 is peeled off from the adhesive layer 32, the adhesive layer 32 protrudes from the side surface of the tape, and blocking occurs when the tape is wound. It happens. On the other hand, in the present invention, the blade angle of the slit blade 11 is reduced to 30 ° or less, so that even if the pitch of the slit blade 11 is 0.5 mm or less, particularly 0.1 mm or more and 0.4 mm or less, as shown in FIG. The compressive force F applied to the intruding surface of the slit blade 11 is reduced, and the laminated film 30 in which the adhesive layer 32 is releasably laminated on the base film 31 is slit without causing their peeling. It is also possible to prevent the adhesive layer 32 from sticking out from the side surface of the tape. Compared with the wide tape, the narrow tape has a relatively large force in the slit width direction applied per cross-sectional area of the tape, so that the adhesive layer tends to protrude. Therefore, it can be said that the difficulty of suppressing the protrusion of the adhesive layer 32 increases as the tape width becomes narrower.

The bladed roll 10 having the region 13 in which the slit blades 11 are arranged at the above-mentioned blade angle α and the pitch p is a cutting blade obtained by cutting a metal roll or a blade angle α as shown in FIG. A braided blade or the like in which round blades are overlapped in the direction of the rotation axis can be used. Of these, the cutting blade shown in FIG. 2 is provided with an easy-to-cut alloy layer on the surface of a roll 12 having high strength and high durability such as carbon steel, and the easy-cut alloy layer is used as a precision cutting apparatus or the like using a diamond tool. It can be obtained by cutting with. Further, the braided blade can be obtained by forming individual slit blades 11 by cutting and combining the slit blades at a predetermined pitch. The structure of the slit blade is such that the blade angle is 30 ° or less, the pitch is 0.5 mm or less, preferably less than 0.5 mm, more preferably 0.4 mm or less, and there is no particular limitation as long as the effects of the present invention can be obtained.

As the easy-to-cut alloy (that is, an alloy having good machinability) for forming the slit blade, a nickel-phosphorus alloy, a hard copper alloy, a tool steel, a cemented carbide or the like can be used. From the viewpoint of durability of the easy-to-cut alloy, a Vickers hardness of 475 or more is preferable, 500 or more is more preferable, 550 or more is further preferable, and 1400 or more is particularly preferable.

<Assembly of roll with blade and anvil roll>
In the slit device 1, the bladed roll 10 and the anvil roll 20 are supported by bearings 15 and 25, respectively, and are arranged so that the rotating shafts L1 and L2 are parallel to each other, as shown in FIG. 3A. As long as the rotation axes L1 and L2 are parallel, the directions of the rotation axes L1 and L2 may be horizontal or vertical. From the viewpoint of stabilizing the running of the laminated film 30, it is preferable that the directions of the rotation axes L1 and L2 are horizontal and the bladed roll 10 is arranged on the anvil roll 20. On the other hand, from the viewpoint that foreign matter is unlikely to adhere to the laminated film 30, it is preferable that the directions of the rotation axes L1 and L2 are vertical directions.

The bladed roll 10 and the anvil roll 20 are connected by gears 16 and 26, and a drive mechanism for rotating these in the direction of the arrow in FIG. 1 is provided. On the other hand, a drive mechanism for rotating and driving the bladed roll 10 and the anvil roll 20 individually may be provided.

The amount of cut d2 (FIG. 2) of the slit blade 11 into the carrier film 4 is preferably 10 to 100 μm, more preferably 10 to 50 μm, and even more preferably 10 to 10 μm as an example from the viewpoint of continuously and stably slitting. It is set to 20 μm. It is preferable that the slit device 1 is provided with an adjusting mechanism for moving the mounting position of the bladed roll 10 with respect to the anvil roll 20 so that the depth of cut d2 can be adjusted according to the thickness of the carrier film 4. As the adjusting mechanism, a linear guide mechanism or the like for moving the bladed roll 10 along the guide 17 by the adjusting screw 18 can be provided.

On the other hand, when a carrier film having a constant film thickness is used, as shown in FIG. 3B, a large diameter portion 14 projecting toward the anvil roll 20 from the cutting edge of the slit blade 11 is provided on the bladed roll 10. The large diameter portion 14 may be pressed against the anvil roll 20. The thrust for pressing the large diameter portion 14 against the anvil roll 20 can be about 800 N. If this thrust is excessively increased, a problem of bending occurs in the bladed roll 10. Further, as shown in FIG. 3C, tool steel, cemented carbide, etc. are cut out in a circular shape, cut, and polished to combine round blades with a thickness of 0.5 mm or less, which are fixed by bolts 19 to assemble. The blade may be formed, and the arrangement region 13 of the slit blade may be formed by the braided blade. In the mode shown in FIG. 3C, as in the mode shown in FIG. 3A, the mounting position of the anvil roll 20 and the bladed roll 10 is adjusted by the adjusting screw 18, so that the bladed roll 10 is pressed against the anvil roll 20. No thrust is required.

<Slit method>
The slit method of the present invention is a method of slitting the laminated film 30 between the above-mentioned bladed roll 10 and the anvil roll 20 through a laminated film 30 in which an adhesive layer 32 is detachably laminated on a base film 31. Therefore, a method of slitting the laminated film 30 by a score cut method by putting the laminated film 30 on the bladed roll 10 side and the carrier film 4 on the anvil roll 20 side and passing the laminated film 30 and the carrier film 4 on top of each other. (Figs. 1 and 4). As will be described later, when the laminated film 30 is composed of the base film 31, the adhesive layer 32, and the cover film 33, as shown in FIG. 4, the base film 31 of the laminated film 30 is on the side of the roll 10 with a blade to cover. Generally, the film 33 is on the carrier film 4 side. In this case, the cover film 33 and the carrier film 4 are adhered and slit, and after the slit, the cover film 33 and the carrier film 4 are combined and peeled from the adhesive layer 32. On the other hand, the cover film 33 of the laminated film 30 may be slit on the side of the roll 10 with a blade, and the base film 31 may be on the side of the carrier film 4.

The carrier film 4 is half-cut by this slit, but the laminated film 30 is cut through at a predetermined pitch. Therefore, among the plurality of rows of tapes obtained by the through-cutting of the laminated film 30, adjacent tapes are different from each other. The even-numbered rows of tape 3a and the odd-numbered rows of tape 3b are respectively wound by a winding device so as to be wound in the direction.

The end portion (ear of the laminated film) 3c of the laminated film 30 after the slit and the half-cut carrier film 4 are wound together. Further, the cover film 33 may be wound together with the carrier film 4.

The amount of cut d2 into the carrier film 4 by the slit blade 11 is preferably 10 μm or more and 100 μm or less as described above. Further, the total thickness of the slitted object (laminated film 30 and carrier film 4) is preferably 90% or less with respect to the blade height h. For example, when the blade height is 300 μm, the total thickness of the slitted object is 270 μm. The following is preferable (Fig. 2). More preferably, the total thickness of the slitted object is 70% or less, and more preferably 50% or less with respect to the blade height h.

The slit is preferably performed in a clean room, but it is not necessary to provide a hood that covers the entire slit device in order to suppress fluctuations in the environmental temperature, but it may be provided.

<Laminated film>
As the laminated film 30 slit by the slit method of the present invention, for example, as shown in FIG. 4, a base film 31 having a thickness of 12 to 75 μm, particularly 25 to 75 μm, and an adhesive having a thickness of 5 to 40 μm, particularly 5 to 25 μm. Examples thereof include a layer 32 in which a cover film 33 having a thickness thinner than that of the base film or a thickness of 10 to 50 μm is sequentially peeled off and laminated. Here, peeling means that the base film 31 or the cover film 33 is peeled off by sticking a cellophane tape, or the end of the base film 31 or the cover film 33 is picked up with a film tweezers (hereinafter, tweezers) and peeled off. This means that the base film 31 or the cover film 33 can be easily peeled off from the adhesive layer 32.

As shown in FIG. 4, the base film 31 may be arranged on the invading side of the slit blade 11 at the time of slitting, or the cover film 33 may be arranged on the invading side of the slit blade 11.

The cover film 33 may not be provided on the laminated film 30 depending on the use of the laminated tape obtained by slitting the laminated film. When the carrier film 4 is laminated on the laminated film 30, the rigidity of the entire film is increased. Therefore, even if the cover film 33 is not provided, the adhesive layer 32 is attached to the slit blade 11 immediately after the slit, so that the adhesive layer is attached to the base film 31 to the adhesive layer. It is possible to prevent the 32 from peeling off. On the other hand, from the viewpoint of preventing contamination of the laminated tape, it is preferable to have the cover film 33, and particularly when obtaining a narrow laminated tape, it is preferable to have the cover film 33. As the wound body which is finally used as an adhesive, the cover film may be used to prevent contamination or may not be used to improve workability.

(Base film, cover film)
As the base film 31, a film formed of a thermoplastic resin such as polyester such as polyethylene, polypropylene, and PET can be mentioned. The cover film 33 is provided to prevent the adhesive layer 32 from being contaminated, and can be formed from the same material as the base film 31. The surfaces of the base film 31 and the cover film 33 are preferably peeled off. This is to make it separable from the adhesive layer. In order to allow the cover film to be peeled off after the slit, it is preferable to use a cover film 33 that is easier to peel off than the base film 31.

In the present invention, the adhesive layer 32 having a relatively low rigidity and the base film 31 having a relatively high rigidity are slit at the same time so as not to be separated at the time of slitting, and the adhesive layer 32 and the base film are used when the laminated tape after the slit is used. 31 can be peeled off. Here, since the tensile elastic modulus of polyesters such as polyethylene, polypropylene, and PET is approximately 1100 to 4200 MPa, the width of the film formed of such a thermoplastic resin and the adhesive layer 32 having different rigidity from the film are 0 at the same time. Slitting to a narrow width of .5 mm or less and suppressing separation or peeling of the film and the adhesive layer at the time of slitting is a highly difficult technique, but according to the present invention, such slitting is possible.

(Adhesive layer)
As the adhesive layer 32, an adhesive film may be laminated, or a coating film of an adhesive may be laminated. Depending on the use of the tape obtained by slitting the laminated film 30, the adhesive layer 32 may be composed of a single resin layer, or may be composed of a laminated body or a multilayer body of a plurality of resin layers. Good. Further, the adhesive layer 32 may contain a filler, if necessary.

(Adhesive layer filler)
When the adhesive layer contains a filler, the filler is a known inorganic filler (metal, metal oxide, metal nitride, etc.) or an organic filler, depending on the use of the tape obtained by slitting the laminated film 30. (Resin, rubber, etc.), fillers in which organic and inorganic materials are mixed, etc. are appropriately selected according to the application. For example, silica fillers, titanium oxide fillers, styrene fillers, acrylic fillers, melamine fillers, various titanium salts and the like can be used for optical applications and matte applications. Applications for film for condensers include titanium oxide, magnesium titanate, zinc titanate, bismuth titanate, lanthanum oxide, calcium titanate, strontium titanate, barium titanate, barium titanate titanate, lead zirconate titanate and these. A mixture of the above can be used. When used as an adhesive, polymer-based rubber particles, silicone rubber particles, and the like can be contained. For mounting applications of electronic components, the filler may have conductivity or insulation. If the filler is insulating, for example the filler can be used as a spacer.

The particle size of the filler can be determined according to the use of the tape obtained by slitting the laminated film 30. For example, when this tape is used for mounting electronic components, the particle size of the filler is preferably 1 μm or more, more preferably 2.5 μm or more and 30 μm or less.
Here, the particle size means the average particle size. The average particle size can be obtained from a plan image or a cross-sectional image of the adhesive layer 32 of the laminated film 30. Further, the average particle size of the filler as the raw material particles before the filler is contained in the adhesive layer 32 of the laminated film 30 can be obtained by using a wet flow type particle size / shape analyzer FPIA-3000 (Malburn Co., Ltd.). The number of N is 1000 or more, preferably 2000 or more, and more preferably 5000 or more. On the other hand, the filler may contain particles having a particle diameter of less than 1 μm. Examples of the filler having a particle diameter of less than 1 μm (so-called nanofiller) include a filler for adjusting the viscosity. This size can be determined by observation with an electron microscope (TEM, SEM). The number of N is preferably 200 or more.

As the filler, a filler having functionality such as a quantum dot may be included. The size of such a filler is not particularly limited, but is preferably 2 nm or more, and more preferably 10 nm or more. This size can also be determined by observing with an electron microscope (TEM, SEM). The number of N is preferably 200 or more.

In the present invention, the filler described below refers to the above-mentioned filler having a particle diameter of 1 μm or more, unless otherwise specified. That is, nanofillers used as surface modifiers and fillers are removed.

In the adhesive layer, the fillers may be kneaded in the resin and dispersed randomly, may be individually non-contact in a plan view, and have a regular arrangement in which a predetermined arrangement is repeated in a plan view. May be good. The number density of the fillers can be appropriately adjusted within a range that does not affect the slits of the film, and can be, for example, 30 to 100,000 pieces / mm ² in the surface field of view. This number density is measured by observing the filler in the adhesive layer using an optical microscope or a metallurgical microscope in a plan view, setting a total of 10 or more regions to 2 mm ² or more, and making the total number of fillers 200 or more. Is preferable.

(Resin composition forming an adhesive layer)
On the other hand, as the resin composition for forming the adhesive layer 32, a resin composition exhibiting adhesiveness or adhesiveness is appropriately selected depending on the use of the tape obtained by slitting the laminated film 30 and the presence or absence of a filler, and the thermoplastic resin composition. It can be formed from a product, a high-viscosity adhesive resin composition, a curable resin composition, or the like. For example, when the tape is used as an adhesive for mounting electronic parts, the resin composition for forming the adhesive layer is polymerized in the same manner as the resin composition for forming the insulating resin layer described in WO2018 / 074318A1. A curable resin composition containing a sex compound and a polymerization initiator can be obtained. It may be a so-called hot melt type adhesive that does not contain a curable resin composition.

As the polymerization initiator of the curable resin composition, a thermal polymerization initiator may be used, a photopolymerization initiator may be used, or they may be used in combination. For example, a thermocationic polymerization initiator is used as the thermal polymerization initiator, an epoxy resin is used as the thermal polymerizable compound, a photoradical polymerization initiator is used as the photopolymerization initiator, and an acrylate compound is used as the photopolymerizable compound. A thermal anion-based polymerization initiator may be used as the thermal polymerization initiator. As the thermal anion-based polymerization initiator, it is preferable to use a microcapsule type latent curing agent having an imidazole modified product as a nucleus and the surface thereof coated with polyurethane.

The minimum melt viscosity of the adhesive layer formed of such an insulating resin composition as a whole is not particularly limited, but can be 100 Pa · s or more from the viewpoint of film formation, and the adhesive layer 32 is thermocompression bonded to the article. It is preferably 1500 Pa · s or more in order to suppress unnecessary flow of the filler at the time of. On the other hand, the upper limit of the minimum melt viscosity is not particularly limited, but as an example, it is preferably 15,000 Pa · s or less, and more preferably 10,000 Pa · s or less. This minimum melt viscosity can be determined by using a rotary rheometer (manufactured by TA instrument) as an example, keeping the measurement pressure constant at 5 g, and using a measurement plate having a diameter of 8 mm. More specifically, the temperature range. It can be obtained by setting the temperature rise rate at 10 ° C./min, the measurement frequency at 10 Hz, and the load fluctuation with respect to the measurement plate at 30 to 200 ° C. The minimum melt viscosity can be adjusted by changing the type and blending amount of the fine solids contained as the melt viscosity modifier, the adjustment conditions of the resin composition, and the like.

(Adhesive strength of adhesive layer)
-Peelability The adhesive strength of the adhesive layer 32 to the base film 31 and the cover film 33 is weaker than the adhesive strength of the adhesive layer 32 when the adhesive layer 32 is attached to a predetermined article for each application of the tape. , The base film 31 and the cover film 33 can be peeled off from the adhesive layer 32. Usually, after the cover film 33 is peeled off, the adhesive layer 32 is attached to the article to evaluate the peelability of the base film 31. The fact that the base film 31 and the cover film 33 can be peeled off from the adhesive layer 32 means that the base film 31 or the cover film 33 can be peeled off by attaching cellophane tape to the base film 31 or the cover film 33, or by using tweezers. It means that these can be easily peeled off from the adhesive layer 32 by pinching and peeling off the edges of the cover film 33. As a specific index, the laminated film before the slit is cut into a width of 5 cm and a length of 15 cm. When a T-type peeling test (JIS K 6854) is performed as a peeling test, the adhesive strength is 0.005 to 0.2N. Depending on the material and thickness of the base film 31, it may be evaluated by a 180 ° peeling test or a 90 ° peeling test. It is common to first peel off the cover film 33 from the base film 31 and the adhesive layer 32 using cellophane tape, attach the adhesive layer 32 to the article, and then peel off the base film 31 with tweezers.

-Stability On the other hand, when the laminated film 30 is slit into a tape and the tape is wound on a reel by a winding device to form a wound body, or when the tape made into a wound body is used as an adhesive, the wound body is used. When the tape is pulled out from the winding body by attaching the tape to the connecting device, tension is applied to the tape in the length direction of the tape. Therefore, it is preferable to prevent the base film 31 and the adhesive layer 32 from peeling off when such tension is applied to the tape. That is, conventionally, the tape length required for the wound body in the connecting device is usually 5 m or more, preferably 10 m or more, and the tension applied in the length direction of the tape when the tape is pulled out from the wound body is about 1N to 5N. It is common. Further, if a problem occurs during the operation of the connecting device, the reel may be locked and the tape may be tensioned by 5 to 6 N. Therefore, it is necessary to assume that a load of about 5 N is applied to the tape. Therefore, in this tension, the state of attachment between the base film and the adhesive layer, the connection between the reel and the base film (the connection between the lead taken out from the reel and the base film by an adhesive film such as silicon tape, or ultrasonic waves. Welding) is preferably maintained.

However, when the tape is narrowed, there is a concern that the base film may be broken or the base film and the adhesive layer may be peeled off when the conventional tension is applied to the tape. Therefore, when winding or pulling out a narrow tape by making the best use of the existing equipment, the tension applied in the length direction of the tape may be about 0.5N, preferably less than 1N. The upper limit is more preferably 0.7 N or less, still more preferably 0.3 N or less.

From the practical requirement of enabling such winding and pulling out, the adhesive layer 32 is preferably a laminated tape having a width of 0.1 mm or more and 0.5 mm or less slit by the method of the present invention and having a length of 1 m or more. The stability that the base film 31 and the cover film 33 do not peel off from the adhesive layer 32 when a tension of 0.5 N or more, preferably 1 N, more preferably 5 N is applied to a film of 5 m or more in the length direction. Desired. The above-mentioned peelability is a property relating to the upper limit of the adhesive force of the adhesive layer 32 to the base film 31 and the cover film 33, and this stability is a property relating to the lower limit of the adhesive force.

It is preferable to carry out the stability test simply. Therefore, as a test method, the test length of the laminated tape is set to 1 m, one end of the laminated tape cut to a length of 1 m is fixed, and 0.5 N, preferably 1 N, more preferably 5 N is applied to the other end to form a base film. A test for observing the presence or absence of peeling between 31 and the adhesive layer 32 can be given. Further, as a more practical test method, a test in which a tape is pulled out from the wound body by 1 m or more, 0.3N, 0.5N, 1N, or 5N is applied to the end thereof, and the presence or absence of peeling is observed is given. be able to. Further, the entire length of the tape may be pulled out from the wound body, and the presence or absence of peeling may be observed at any 20 or more places, preferably 50 or more places. In such a test, as an example of an index of adhesive strength required in practice, (i) a laminated film is slit into a laminated tape having a width of 0.1 mm or more and 0.5 mm or less by the method of the present invention, and a cover film is used. Is peeled off to form a tape winding body of the adhesive layer and the base film, and the tape is pulled out from the winding body to a length of 1 m to fix the connection position between the reel winding core and the tape, and a static load is applied to the end of the tape. When a tension of 0.3 N, preferably 0.5 N, more preferably 1 N, and even more preferably 5 N is applied at a connecting position angle α (Japanese Unexamined Patent Publication No. 2017-137188) at 90 °, the base film becomes It should not be peeled off from the adhesive layer, and it should not protrude to the extent that it affects the drawing out. (Ii) The laminated film was arbitrarily cut from a laminated tape slit with a width of 0.1 mm or more and 0.5 mm or less by the method of the present invention. In a test piece having a test length of 1 m, the base film 31 does not peel off from the adhesive layer 32 when a tension of 0.5N, preferably 1N, more preferably 5N is applied in the length direction of the test piece. iii) When the tape of the adhesive layer and the base film is wound around the core with 0.5 N and the tape is completely pulled out by hand from the wound body, the peeling of the adhesive layer and the base film is visually observed over the entire length of the tape. It can be mentioned that it is not confirmed (details will be described in Examples described later). The method (iii) is preferable from the viewpoint of simple testing. It may be confirmed that the base film and the adhesive layer do not peel off when the test length is cut to about 1 m and a load (about 1N to 5N) is applied to both ends by hand.

When the laminated tape has the above-mentioned adhesive strength, the laminated tape is preferably wound around a wound body having a length of 5 m or more, 10 m or more, 50 m or more, and further 100 m or more in length, and the tape is preferably wound from the wound body. Even when the tape is pulled out by 1 m or more, more preferably 5 m or more, the base film 31 can be prevented from peeling from the adhesive layer 32 in the pulled out tape, and this tape can be used for mounting electronic components.

-Adhesive strength to the object to be connected On the other hand, as a test method of the adhesive force required for the adhesive layer from the viewpoint of the adhesive force to the object to be connected such as electronic parts and substrates, a small piece with a length of 2 cm arbitrarily collected from a laminated tape ( A small piece obtained by cutting a test piece of the 1 m laminated tape of (ii) described above is temporarily attached to the base glass from the adhesive layer side (for example, attached at 45 ° C.), and the base film 31 (or cover film) is attached with tweezers. A peeling test was conducted in which only the edge of 33) was pinched and removed, and in the peeling test, only the base film 31 (or the cover film 33) could be removed, and the adhesive layer was attached to the plain glass without changing its shape. Here are some ways to make it a success if you can leave it alone. In this peeling test, success of 75% or more is preferable when the number of N is 20 or more, success of 80% or more is more preferable, and success of 90% or more is further preferable.

(Attachment of connecting tape)
The laminated film 30 is connected to the laminated film 30 in order to attach leads at the beginning or unwinding of the wound body, or to bond the first laminated film and the second laminated film to lengthen the laminated film 30. A tape may be attached. There can be multiple connecting points regularly or randomly. Further, when attaching the laminated film and the lead, the base film 31 of the laminated film 30 and the lead can be connected with a connecting tape. The attachment of the laminated film to the lead may be a known method such as ultrasonic welding.

As the connecting tape, an adhesive tape with a base material (for example, silicon tape) having high peelability and a relatively thin total thickness can be used. The thickness of the connecting tape is not particularly limited, but 5 to 75 μm is an example.

When slitting the portion where the connecting tape is attached to the laminated film 30, the slit blade 11 penetrates deeply into the laminated body of the laminated film 30 and the connecting tape 35 as shown in FIG. Therefore, according to the conventional slit device, the distance between adjacent blades on the surface of the laminated body on the intruding side of the slit blade 11 is remarkably narrowed, and a strong compressive force is applied from the side surface of the slit blade 11 to the surface on the opposite side. In response to F, the cover film 33 or the base film 31 and the adhesive layer 32 are likely to be peeled off, or the adhesive layer 32 is likely to protrude from the side surface of the slit laminate. On the other hand, according to the present invention, even if the connecting tape 35 is attached to the laminated film 30, it is possible to prevent such peeling and protrusion from occurring.

<Laminated tape>
The laminated tape of the present invention is a tape obtained by slitting the laminated film 30 by the slit method described above. Therefore, this tape is a laminated tape in which an adhesive layer is detachably laminated on a base film, and the upper limit of the tape width is 0.5 mm or less, particularly less than 0.5 mm, more preferably 0.4 mm or less. Even more preferably, it is 0.3 mm or less. The lower limit is 0.1 mm or more, preferably 0.15 mm or more, and more preferably 0.2 mm or more.

This laminated tape is a base film when one end of a test piece is fixed so as to have a test length of 1 m arbitrarily cut from the tape and a tension of 0.3N, 0.5N or 1N is applied to the other end. The adhesive layer does not peel off, and the adhesive layer 32 does not protrude from the wound body. Further, in this laminated tape, when the tape is cut into small pieces having a length of 2 cm, the adhesive layer 32 is attached to the base glass, and only the edge of the base film 31 is picked and removed with tweezers, the adhesive layer is peeled from the base glass. It satisfies the practical requirement that it is difficult to do, and enables so-called sticking and transfer.

From the viewpoint of handleability, it is preferable to use a wound body in which this tape is wound on a reel. From a practical point of view, the tape length in the wound body is preferably 5 m or more and 5000 m or less, more preferably 50 m or more and 1000 m or less, and further preferably 500 m or less. Generally, when the tape width is narrow, blocking is likely to occur in the wound body, but according to the laminated tape of the present invention, blocking is unlikely to occur in the wound body, and even if the tape is pulled out from the wound body by 5 m or more, it is pulled out. The tape does not peel off between the base film 31 or the cover film 33 and the adhesive layer 32.

In general, a floating (discolored portion) may occur visually at the end portion of the slit of the laminated tape obtained by slitting the laminated film. When the tape width is as narrow as 0.5 mm or less, the floating of both ends of the laminated tape may cause unnecessary peeling of the base film and the adhesive layer. However, according to the present invention, since the laminated film is slit with a sharp double-edged blade, even if the presence or absence of floating is visually inspected at 20 or more, preferably 50 or more, from the total length of the tape forming the wound body, floating is performed. Is hard to observe. Even when floating is observed at the end of the laminated tape along the slit cut, the floating is less than 5 cm in length and 40% or less in width with respect to the tape width, particularly 1/3 or less, and the base film. And peeling from the adhesive layer can be suppressed.

As described above, according to the laminated tape of the present invention, the base film and the adhesive layer are less likely to slip, and blocking and floating are less likely to occur. Therefore, the workability of winding and pulling out the wound body is good, and the wound body is pulled out from the wound body and cut out. When the tape is attached to the target member, the attachment position is unlikely to shift. Therefore, the laminated tape of the present invention can be used for various purposes as a narrow adhesive material or an adhesive material. In that case, the type of the resin composition constituting the adhesive layer 32 and the like are appropriately selected according to the target member to which the tape is attached.

Example 1
The base film is formed of a 38 μm thick peeled PET film, the adhesive layer is formed of a 10 μm thick acrylic thermosetting resin (adhesive film, manufactured by Dexerials), and the cover film is 12 μm thick. The laminated film formed of the PET film is slit into a tape having a width of 0.3 mm and a length of 100 m at a time using the cutting blade shown in FIG. 2, the cover film is peeled off, and the base film and the adhesive layer are φ90 mm. A winding core with a flange (distance between flanges 0.4 mm) was wound by applying a tension (winding tension) of 0.3 to 0.6 N to obtain a wound body, and the following evaluation was performed.

(1) Pull out all the 100 m tape as a floating winding body by hand, visually observe 20 test areas with a length of 10 cm at arbitrary positions of the pulled out tape, and visually observe the following items a, b, regarding the presence or absence of floating. Evaluation was made based on c according to the following criteria.

a: No floating with a length of 5 cm or more
b: There is no floating where the width exceeds 1/3 of the tape width.
c: There are 5 or less floats with a length of less than 5 cm or a float with a width of 1/3 or less of the tape width. Evaluation A: When all abc are satisfied Evaluation B: When both ab are satisfied Evaluation C: Evaluation A above And other than evaluation B

This evaluation result was evaluation A. In practice, there is no problem if the evaluation B is satisfied, and it is preferable that the evaluation c is further satisfied.

(2) Peeling In the above test, it was confirmed that no peeling occurred in a total of 50 places, one where the floating was visually observed and the other 30 places. During the test, the entire length was pulled out and visually observed, but there was almost no peeling.
In addition, the adhesive layer did not protrude, which hindered workability, and the adhesion of the adhesive layer to the flange could not be confirmed.

The results of (1) and (2) described above are not limited to slits made by a cutting blade.

1 Slit device 2 Film unwinding device 3 Film 4 Carrier film 5 Carrier film unwinding device 6 Laminate roll 10 Bladed roll 11 Slit blade, round blade 12 Roll 13 Area 14 Large diameter part 15 Bearing 16 Gear 17 Guide 18 Adjusting screw 19 Bolt 20 Anvil roll 25 Bearing 26 Gear 30 Laminated film 31 Base film 32 Adhesive layer 33 Cover film 35 Connecting tape α Slit blade edge angle d1 Gap between slit blade edge and anvil roll d2 Slit blade notch into carrier film Amount F Compressive force h Slit blade blade height L1, L2 Rotation axis p Slit blade pitch

Claims (15)

It is a slit device that has a bladed roll and anvil roll with multiple disc-shaped slit blades provided at a predetermined pitch, and slits the film by the score cut method.
It has a carrier film transport mechanism that interposes a carrier film between the slit film and the anvil roll.
The blade angle of the slit blade is 30 ° or less,
A slit device with a slit blade pitch of 0.5 mm or less. The slit device according to claim 1, wherein the blade angle of the slit blade is 10 ° or more. The slit device according to claim 1 or 2, wherein the pitch of the slit blades is 0.1 mm or more and 0.4 mm or less. The slit device according to any one of claims 1 to 3, wherein the blade height of the slit blade is 0.05 mm or more and 0.8 mm or less. The slit device according to any one of claims 1 to 4, further comprising an adjusting mechanism for moving the mounting position of the bladed roll with respect to the anvil roll. A laminated film in which an adhesive layer is releasably laminated on a base film and a carrier film are laminated between a roll with a blade and an anvil roll in which a plurality of disk-shaped slit blades are provided at a predetermined pitch. This is a score-cut type slit method in which the laminated film is slit by stacking and passing the film on the roll side with a blade.
Set the blade angle of the slit blade to 30 ° or less.
A slit method in which the pitch of the slit blade is 0.5 mm or less. The slit method according to claim 6, wherein the blade angle of the slit blade is 10 ° or more. The slit method according to claim 6 or 7, wherein the pitch of the slit blades is 0.1 mm or more and 0.4 mm or less. The slit method according to any one of claims 6 to 8, wherein the laminated film is formed by laminating a cover film on an adhesive layer so that the cover film can be peeled off. The slit method according to any one of claims 6 to 9, wherein a connecting tape is attached to the laminated film. A laminated tape obtained by slitting a laminated film in which an adhesive layer is releasably laminated on a base film by the slit method according to any one of claims 6 to 10. A laminated tape in which an adhesive layer is detachably laminated on a base film, the tape width is 0.5 mm or less, and one end of a laminated tape having a length of 1 m arbitrarily cut from the laminated tape is fixed. A laminated tape in which the base film and the adhesive layer do not peel off when a tension of 1N is applied to the other end. The laminated tape according to claim 12, wherein the tape width is 0.1 mm or more and 0.4 mm or less. The laminated tape according to claim 12 or 13, wherein a cover film is detachably laminated on the adhesive layer. The laminated tape according to any one of claims 12 to 14, to which a connecting tape is attached.

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