CN113613853A

CN113613853A - Slitting device, slitting method, and laminated tape

Info

Publication number: CN113613853A
Application number: CN202080026344.3A
Authority: CN
Inventors: 玉野博基; 土井克浩; 野田和彦; 川井智永
Original assignee: Dexerials Corp
Current assignee: Dexerials Corp
Priority date: 2019-03-31
Filing date: 2020-03-31
Publication date: 2021-11-05
Anticipated expiration: 2040-03-31
Also published as: TW202042994A; JP2020168715A; CN113613853B; KR20210132119A

Abstract

The laminated film 30 and the carrier film 4, in which the laminated film 30 is formed on the tape cutter roll side 10 and the adhesive layer 32 is releasably laminated on the base film 31, are repeatedly passed between the tape cutter roll 10 and the anvil roll 20, which are provided with a plurality of disk-shaped slitting knives 11 at a pitch of 0.5mm or less, to slit the laminated film 30 by a scribe-and-cut method. The cutting edge angle of the slitting knife 11 is set to 30 degrees or less. Thus, a laminated film obtained by laminating an adhesive layer to a base film in a peelable manner so that the base film and the adhesive layer are not peeled off and the adhesive layer is not extruded is slit to a width of 0.5mm or less.

Description

Slitting device, slitting method, and laminated tape

Technical Field

The present invention relates to a slitting device and a slitting method for a laminated film in which an adhesive layer is laminated to a base film so as to be peelable, and a laminated tape obtained by slitting the laminated film.

Background

A long laminated tape in which an adhesive layer is laminated on a base film so as to be peelable is used as a transfer ribbon for transferring a pattern, a character, or the like to an article (patent document 1). Such a laminated tape is produced by slitting a laminated film in which an adhesive layer is releasably laminated on a base film.

A long laminated tape in which an adhesive layer is releasably laminated on a base film is also used as an adhesive material when an electronic component is mounted on a substrate, and in recent years, a thin laminated tape is required. However, if a laminated film in which an adhesive layer is releasably laminated to a base film is slit to a narrow width, there arises a problem that the base film is peeled from the adhesive layer due to the slit. In contrast, there is such a large-scale process as follows: the entire device for slitting a laminated film by a cutting method using a disc-shaped upper blade and a disc-shaped lower blade is covered with a cover, and temperature fluctuation from slitting to winding of the laminated film is suppressed (patent document 2). According to this method, it is considered that the laminated film can be slit into a thin width having a band width of 0.5mm to 4 mm.

On the other hand, in the shear cutting method using the upper blade and the lower blade, there is a possibility that fine blade abrasion powder generated by contact between the upper blade and the lower blade adheres to the slit tape. On the other hand, as a slitting method capable of alleviating the processing accuracy of a blade required for obtaining a complete cut surface without generating such abrasion powder, there is a method of slitting a slit film together with a carrier film (backing material) in a score cutting (score cut) method using a knife roll and an anvil roll (patent document 3).

Prior art documents

Patent document

Patent document 1: japanese laid-open patent publication No. 2012-232392

Patent document 2: japanese patent laid-open publication No. 2007-90461

Patent document 3: japanese patent laid-open publication No. 2003-285293.

Disclosure of Invention

Problems to be solved by the invention

According to the method described in patent document 2, it is considered that a tape in which the laminated film is slit into a narrow width of 0.5mm is obtained, but no detailed discussion is made for slitting a long tape into a narrow width of 0.5mm or less. Further, the problem of peeling between the substrate and the adhesive layer described in patent document 2 is more likely to occur as the film becomes thinner. Therefore, in the case of a belt having a small width of 0.5mm or less, there is a concern that the product yield may be reduced.

According to the description of patent document 3, a polyester film can be slit to a width of 2mm using a band knife roll with a blade angle of 70 °. However, according to the method described in patent document 3, if the laminated film in which the adhesive layer is laminated so as to be peelable on the base film is slit to a width of 0.5mm or less, the pitch of the blades in the knife roll is narrowed, and thus the surface of the slit laminated film on the blade penetration side is strongly compressed in the slit width direction compared to the surface on the opposite side, and there is also a problem that the adhesive layer is peeled off or pushed out.

In contrast, the present invention addresses the following problems: in the case where the base film and the adhesive layer are not peeled off, a laminated film in which the adhesive layer is peelably laminated to the base film is slit to a tape width of 0.5mm or less, particularly less than 0.5mm, at a slit where extrusion of the adhesive layer does not occur at all.

Means for solving the problems

The present inventors have conceived the following to complete the present invention: in a slitting device of a scribing and cutting method using a knife roll and an anvil roll, a carrier film is used, and if the slitting knife of the knife roll is set to a specific cutting edge, even if the pitch of the slitting knife in the knife roll is set to be less than 0.5mm, particularly less than 0.5mm, the adhesive layer can be prevented from extruding from the slitting belt even if the laminated film laminated on the base film in a manner of being capable of peeling off the base film and the adhesive layer is slit.

That is, the present invention provides a slitting device which comprises a knife roll and an anvil roll arranged at a predetermined pitch with a plurality of disk-shaped slitting knives and slits a film by a scribing and cutting method, a carrier film transfer mechanism which makes the carrier film interposed between the slit film and the anvil roll,

the cutting edge angle of the slitting knife is below 30 degrees,

the distance between the slitting knives is less than 0.5 mm.

The present invention also provides a slitting method of a scribing and cutting method in which a laminated film and a carrier film are laminated on a base film so that an adhesive layer is peelable from the laminated film on the side of a knife roll, the laminated film and the carrier film are repeatedly passed between a knife roll and an anvil roll provided at a predetermined pitch by a plurality of disk-shaped slitting knives,

the cutting edge angle of the slitting knife is below 30 degrees,

the pitch of the slitting knives is set to 0.5mm or less.

The present invention also provides a laminated tape obtained by slitting a laminated film in which an adhesive layer is laminated to a base film so as to be peelable by the slitting method. In addition, a laminated tape is provided as follows: the adhesive layer is a laminated tape in which the adhesive layer is laminated on the base film in a peelable manner, the tape width is 0.5mm or less, and when one end of the laminated tape having a length of 1m is fixed and a tension of 1N is applied to the other end, the base film and the adhesive layer are not peeled off.

ADVANTAGEOUS EFFECTS OF INVENTION

When the slitting device of the present invention is used to slit a laminated film in which an adhesive layer is releasably laminated on a base film by the slitting method of the present invention, a laminated tape having a width of 0.5mm or less, particularly a width of less than 0.5mm can be obtained without peeling the base film and the adhesive layer. Even if a tape of 1m in length is arbitrarily cut out from the laminated tape, one end of the tape is fixed, and a tension of 0.5N, preferably 1N, more preferably 5N is applied to the other end, the base material film and the adhesive layer are not peeled off. Therefore, even if the laminated tape is wound around a reel and used as a wound-up mounted body after being pulled out from the wound-up mounted body, the base film and the adhesive layer are not peeled off due to the tension at the time of winding or pulling out. In addition, in the wound-up mounted body of the laminated tape, the adhesive layer is not extruded. Therefore, the occurrence of a jam can be prevented in the case of the winding-mounted body. Therefore, the laminated tape is useful as an adhesive material for adhering an adhesive layer to a narrow width of an article, and also useful as an adhesive material if the adhesive layer is formed of a curable resin composition.

Drawings

Fig. 1 is a schematic perspective view of a lancing device according to an embodiment.

Fig. 2 is a side view of the vicinity of the arrangement region of slitting blades (cutting blades) of a slitting device for slitting a laminated film.

Fig. 3A is a sectional view showing an assembled structure of the band knife roll and the anvil roll of the apparatus of the embodiment.

Fig. 3B is a sectional view showing a modification of the assembled structure of the band knife roll and the anvil roll.

Fig. 3C is a sectional view showing a modification of the assembled structure of the band knife roll and the anvil roll.

Fig. 4 is an enlarged sectional view of a slitting blade portion when the laminated film is slit using the slitting blade of the apparatus of the embodiment.

Fig. 5 is an enlarged cross-sectional view of a slitting blade portion when slitting laminated films which are joined to each other in the longitudinal direction by a joining tape.

Fig. 6 is an enlarged sectional view of a slitting blade portion when slitting a laminated film with a slitting blade having an edge angle of 70 °.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals denote the same or equivalent constituent elements.

< integral construction of slitting device >

Fig. 1 is a schematic perspective view of a slitting 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 slitting blades when a film 3 is slit by the slitting device 1.

As shown in fig. 2, the slitting device 1 is a device for slitting the film 3 by a score cut (score cut) method, including: a band knife roll 10 having disk-shaped slitting knives 11 arranged at a predetermined pitch in a region 13 of a cylindrical roll 12 in the direction of the rotation axis L1 of the roll 12; and a cylindrical anvil roll 20. Since the blades do not contact each other according to the scribing cutting manner, as compared to the case where the upper blade contacts the lower blade in the shear cutting manner, the life of the blades can be extended.

The slitting device 1 is provided with a film unwinding device 2 and a winding device (not shown) as a conveying mechanism for passing the slit film 3 between the cutter roll 10 and the anvil roll 20. As the winding means, it is possible to provide a winding means for winding the tapes 3a in the even number rows and a winding means for winding the tapes 3b in the odd number rows, respectively, so that adjacent tapes in a plurality of rows of tapes obtained by slitting the film are wound in different directions from each other. In fig. 1, the tapes 3a in the even-numbered rows are wound upward and the tapes 3b in the odd-numbered rows are wound downward, but the tapes in the even-numbered rows may be wound downward and the tapes in the odd-numbered rows may be wound upward.

The slitting device 1 is provided with a carrier film winding unit (not shown) that winds the carrier film unwinding device 5, the pair of laminating rollers 6 that superimpose the carrier film 4 and the film 3, the slit film ends (film ears), and the carrier film 4 together, as carrier film conveying means for interposing the carrier film 4 between the slit film 3 and the anvil roller 20.

In the slitting device 1, as described later, the slit film 3 can be slit not only into a single resin film or a laminated film in which a plurality of resin layers are bonded or welded, but also into a laminated film 30 (fig. 4) in which an adhesive layer 32 is laminated to a base film 31 so as to be peelable, and the width is 0.5mm or less, particularly less than 0.5 mm.

< slitting cutter >

The slitting blade 11 provided to the band knife roll 10 is preferably double-edged in order to stabilize the slitting direction. If the slitting knife is made single-edged (that is, if one of the 2 cutting edge surfaces forming the cutting edge is a flat surface and the other is a knife edge surface), the force applied to the slitting knife in the film width direction during slitting is greater on the knife edge surface than on the flat surface, and the film is bent in the knife edge side direction and conveyed, so that there is a need to increase the margin in the width direction of the slit film, and the amount of film end disposal increases. On the other hand, by using the double blade, the forces applied to the slitting blade in the film width direction during slitting are equal on both side surfaces of the blade, so that the film can be prevented from being bent in the film conveying direction, and the amount of film end portion waste can be reduced.

The cutting edge angle α of the slitting knife 11 is preferably 30 ° or less, particularly 25 ° or less, from the viewpoint that a laminated film provided with an adhesive layer so as to be peelable from a base film can be slit to a point having a width of 0.5mm or less, particularly a narrow width of less than 0.5mm, without peeling the base film and the adhesive layer. On the other hand, the cutting edge angle α is preferably 10 ° or more from the viewpoint of durability of the slitting knife.

The pitch p of the slitting knives 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 may be 0.5mm or less, particularly less than 0.5mm, and further 0.4mm or less so as to be compatible with the tape having a small width. The lower limit is preferably 0.1mm or more.

The cutting edge height h of the slitting blade 11 is preferably a high height from the viewpoint of stabilizing the slitting accuracy, and the lower limit thereof is preferably 0.05mm or more, more preferably 0.1mm or more, and still more preferably 0.24mm or more. On the other hand, the cutting edge height h of the slitting blade is preferably low in terms of durability of the slitting blade, and the upper limit thereof is preferably 0.8mm or less, more preferably 0.7mm or less, and still more preferably 0.5mm or less.

In the case where the pitch is 0.5mm or less by making the cutting edge angle α of the slitting knife 70 °, as described in patent document 3, if slitting a laminated film laminated on a base film so that an adhesive layer can be peeled off, even if the laminated film 30 is provided with the adhesive layer 32 and the cover film 33 in this order on the base film 31 as shown in fig. 6, the adhesive layer 32 is a layer not exposed to the film surface, and the surface of the laminated film 30 on the entry side of the slitting knife 11 receives a strong compressive force F in the slit width direction as compared with the surface on the opposite side thereof. Therefore, in the slit tape, the base material film 31 or the cover film 33 is peeled off from the adhesive layer 32, or the following problems occur: the adhesive layer 32 is extruded from the side of the tape, and if the tape is formed into a wound package, blocking occurs. In contrast, in the present invention, since the cutting edge angle of the slitting knife 11 is reduced to 30 ° or less, even if the pitch of the slitting knife 11 is 0.5mm or less, particularly 0.1mm or more and 0.4mm or less, the compressive force F applied to the face of the penetration side of the slitting knife 11 as shown in fig. 4 is reduced, the laminated film 30 in which the adhesive layer 32 is laminated in a peelable manner on the base film 31 can be slit without causing peeling thereof, and the adhesive layer 32 can be suppressed from being pushed out from the side face of the tape. Since the force in the slit width direction applied per unit belt cross-sectional area is relatively large in the thin-width belt as compared with the wide-width belt, it becomes easy for the extrusion of the adhesive layer to occur. Therefore, the suppression of the extrusion of the adhesive layer 32 can be said to be that the ease becomes high if the band width is narrowed.

As the band knife roll 10 having the region 13 in which the slitting knives 11 are arranged at the cutting edge angle α and the pitch p, a cutting knife obtained by cutting a metal roll as shown in fig. 2, a combination knife in which round knives having the cutting edge angle α are overlapped in the direction of the rotation axis, or the like can be used. The cutting blade shown in fig. 2 can be obtained by providing a free-cutting alloy layer on the surface of a high-strength and high-durability roll 12 such as carbon steel and cutting the free-cutting alloy layer with a precision cutting device using a diamond tool or the like. The gang tool can be obtained by forming the slitting blades 11 by cutting and combining the slitting blades at a predetermined pitch. The structure of the slitting knife is not particularly limited as long as the effect of the present invention is obtained, and the cutting edge angle is 30 ° or less, and the pitch is 0.5mm or less, preferably less than 0.5mm, and more preferably 0.4mm or less.

As the free-cutting alloy (i.e., an alloy having excellent machinability) for forming the slitting blade, nickel-phosphorus alloy, hard copper alloy, tool steel, cemented carbide, and the like can be used. In view of the durability of the free-cutting alloy, an alloy having a vickers hardness of 475 or more is preferable, 500 or more is more preferable, 550 or more is more preferable, and 1400 or more is particularly preferable.

< Assembly of knife roll and anvil roll >

In the slitting device 1, as shown in fig. 3A, the tape cutter roll 10 and the anvil roll 20 are supported by

bearings

15 and 25, respectively, and are arranged such that the rotation axes L1 and L2 are parallel to each other. As long as the rotation axes L1, L2 are parallel, the directions of the rotation axes L1, L2 may be horizontal or vertical. In order to stabilize the running of the laminate film 30, it is preferable to dispose the tape cutter roll 10 on the anvil roll 20 with the directions of the rotation axes L1 and L2 horizontal. On the other hand, the directions of the rotation axes L1, L2 are preferably set to the vertical direction from the point where foreign matter is less likely to adhere to the laminated film 30.

The knife roll 10 and the anvil roll 20 are coupled by

gears

16 and 26, and a drive mechanism is provided for rotating these rolls in the direction of the arrow in fig. 1. On the other hand, a drive mechanism may be provided for rotationally driving the band knife roll 10 and the anvil roll 20, respectively.

In order to continuously stabilize the point of slitting, as an example, the amount d2 (fig. 2) of slitting knife 11 into carrier film 4 is preferably 10 to 100 μm, more preferably 10 to 50 μm, and still more preferably 10 to 20 μm. The lancing device 1 is preferably provided with the following adjustment mechanism: the mounting position of the band knife roll 10 is moved relative to the anvil roll 20 so that the cut amount d2 can be adjusted according to the thickness of the carrier film 4. As the adjustment mechanism, a linear guide mechanism or the like for moving the band knife roller 10 along the guide portion 17 by the adjustment 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, the large-diameter portion 14 protruding toward the anvil roll 20 from the cutting edge of the slitting blade 11 may be provided on the knife roll 10, and the large-diameter portion 14 may be pressed against the anvil roll 20. The thrust force for pressing the large diameter portion 14 against the anvil roll 20 can be about 800N. If this thrust is excessively increased, a problem of deflection occurs in the band knife roll 10. As shown in fig. 3C, a combined blade may be formed by combining circular blades having a thickness of 0.5mm or less, which are formed by finishing a tool steel, cemented carbide, or the like into a circular shape by cutting, or grinding, and fixing the circular blades by bolts 19, and the arrangement region 13 of the slitting blades may be formed by the combined blade. In the embodiment shown in fig. 3C, as in the embodiment shown in fig. 3A, since the attachment positions of the anvil roll 20 and the band knife roll 10 are adjusted by the adjustment screws 18, a thrust force for pressing the band knife roll 10 against the anvil roll 20 is not required.

< slitting method >

The slitting method of the present invention is a method of slitting a laminated film 30 in which an adhesive layer 32 is releasably laminated on a base film 31, the laminated film 30 being passed between the knife roll 10 and the anvil roll 20, and is a method of: the laminated film 30 is slit in a scoring manner by repeatedly passing the laminated film 30 and the carrier film 4 through the laminated film 30 and the carrier film 4 with the laminated film 30 being the knife roll 10 side and the carrier film 4 being the anvil roll 20 side (fig. 1, 4). As described later, when the laminated film 30 is composed of the base film 31, the adhesive layer 32, and the cover film 33, the base film 31 of the laminated film 30 is generally set to the doctor roll 10 side and the cover film 33 is set to the carrier film 4 side as shown in fig. 4. In this case, the cover film 33 and the carrier film 4 are bonded and slit, and after the slit, the cover film 33 and the carrier film 4 are peeled off together from the adhesive layer 32. On the other hand, the cover film 33 of the laminated film 30 may be slit on the doctor roll 10 side and the base film 31 may be slit on the carrier film 4 side.

Since the carrier film 4 is half-cut by the slit, but the laminated film 30 is through-cut at a predetermined pitch, the tapes 3a in the even rows and the tapes 3b in the odd rows are wound by the winding device so that adjacent tapes in the plurality of rows obtained by through-cutting the laminated film 30 are wound in different directions.

Further, the end portions (ears of the laminated film) 3c of the slit laminated film 30 are wound together with the half-cut carrier film 4. In addition, the cover film 33 may be wound together with the carrier film 4.

The amount d2 of cutting into the carrier film 4 by the slitting blade 11 is preferably 10 μm or more and 100 μm or less as described above. The total thickness of the slit-formed articles (the laminate film 30 and the carrier film 4) is preferably 90% or less with respect to the blade height h, and for example, when the blade height is 300 μm, the total thickness of the slit-formed articles is preferably 270 μm or less (fig. 2). More preferably, the total thickness of the objects to be cut is 70% or less, and still more preferably 50% or less, with respect to the cutting edge height h.

The slit is preferably performed in a clean room, and a cover for covering the entire slit device is not required to suppress the change in the ambient temperature.

< laminated film >

As the laminated film 30 slit by the slitting method of the present invention, for example, as shown in fig. 4, there can be mentioned a laminated film in which a base film 31 having a thickness of 12 to 75 μm (particularly, 25 to 75 μm), an adhesive layer 32 having a thickness of 5 to 40 μm (particularly, 5 to 25 μm), and a cover film 33 having a thickness thinner than the base film or a thickness of 10 to 50 μm are laminated in this order so as to be peelable. Here, the peeling means that the base film 31 or the cover film 33 can be easily peeled from the adhesive layer 32 by attaching a cellophane tape to the base film 31 or the cover film 33 and peeling it off, or by pinching and peeling off the ends of the base film 31 or the cover film 33 with a film forceps (hereinafter, forceps).

As shown in fig. 4, the base film 31 may be disposed on the entry side of the slitting blade 11 or the cover film 33 may be disposed on the entry side of the slitting blade 11 during slitting.

Depending on the application of the laminated tape obtained by slitting the laminated film, the cover film 33 may not be provided on the laminated film 30. Since the rigidity of the entire film is increased if the carrier film 4 is laminated on the laminated film 30, even if the cover film 33 is not present, the adhesive layer 32 is stuck to the slitting blade 11 immediately after slitting, and thus the situation in which the adhesive layer 32 is peeled off from the base material film 31 can be eliminated. On the other hand, the cover film 33 is preferably present in order to prevent the laminated tape from being contaminated, and particularly, in the case of obtaining a laminated tape having a narrow width, the cover film 33 is preferably present. The wound-up mounted body (which is a form to be finally used as an adhesive material) may have a cover film for preventing contamination, or may not have a cover film for improving workability.

(base film, cover film)

Examples of the base film 31 include films made of thermoplastic resins such as polyethylene, polypropylene, and polyester such as PET. The cover film 33 is provided to prevent the adhesive layer 32 from being contaminated, and may be formed of the same material as the base film 31. The surface of the base material film 31 or the cover film 33 is preferably subjected to a peeling treatment. Because of the ability to separate from the adhesive layer. In order to peel off the cover film first after slitting, it is preferable to use a material that is more easily peeled off in the cover film 33 than the base material film 31.

In the present invention, the adhesive layer 32 having low rigidity and the base film 31 having high rigidity are simultaneously slit without being separated at the time of slitting, and the adhesive layer 32 and the base film 31 can be peeled off when the slit laminated tape is used. Here, since the tensile modulus of polyester such as polyethylene, polypropylene, PET and the like is about 1100-4200MPa, it is a highly difficult technique to slit a film made of such a thermoplastic resin and an adhesive layer 32 having a rigidity different from that of the film into a thin width of 0.5mm or less at the same time and to suppress separation or peeling of the film and the adhesive layer at the time of slitting, but according to the present invention, such slitting can be performed.

(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 laminate film 30, the adhesive layer 32 may be composed of a single resin layer, or may be composed of a laminate or a multilayer of a plurality of resin layers. The adhesive layer 32 may contain a filler as needed.

(Filler for adhesive layer)

When the filler is contained in the adhesive layer, the filler is appropriately selected from well-known inorganic fillers (metals, metal oxides, metal nitrides, and the like), organic fillers (resins, rubbers, and the like), fillers in which an organic material and an inorganic material are mixed, and the like according to the use of the tape obtained by slitting the laminated film 30. For example, silica fillers, titanium oxide fillers, styrene fillers, propylene fillers, melamine fillers, various titanates, and the like can be used for optical applications or matting applications. For the use of the film for a condenser (condenser), titanium oxide, magnesium titanate, zinc titanate, bismuth titanate, lanthanum oxide, calcium titanate, strontium titanate, barium zirconate titanate, lead zirconate titanate, a mixture of these materials, and the like can be used. In the application as an adhesive material, polymer-based rubber particles, silicone rubber particles, and the like can be contained. In the application of the package of the electronic component, the filler may have conductivity or insulation. When the filler has an insulating property, the filler can be used as a spacer, for example.

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 the tape is used for packaging electronic components, the particle diameter of the filler is preferably 1 μm or more, more preferably 2.5 μm or more and 30 μm or less.

Here, the particle diameter means an average particle diameter. The average particle diameter can be determined from a plan view image or a cross-sectional image of the adhesive layer 32 of the laminated film 30. The average particle size of the filler as the raw material particles before the filler is contained in the adhesive layer 32 of the laminate film 30 can be determined using a wet flow particle size/shape analyzer FPIA-3000 (Malvern). The number of N is 1000 or more, preferably 2000 or more, more preferably 5000 or more. On the other hand, the filler may have 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 fillers for adjusting viscosity. The size can be determined by observation with an electron microscope (TEM, SEM). The number of N is preferably 200 or more.

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

In the present invention, the filler described below means the filler having the particle diameter of 1 μm or more as described above unless otherwise noted. That is, nanofillers used as surface modifiers or fillers are excluded.

In the adhesive layer, the filler may be kneaded in the resin and randomly dispersed, or may not be in contact with each other in a plan view, or may be arranged regularly so as to repeat a predetermined arrangement in a plan view. The number density of the filler is appropriately adjusted within a range not affecting the slitting of the film, and can be, for example, 30 to 100000 pieces/mm in the planar view². The number density is preferably measured as follows: observing the filler in the adhesive layer with an optical microscope or a metal microscope in a plan view such that 10 or more regions are 2mm in total²The total number of fillers is 200 or more.

(adhesive layer-Forming resin composition)

On the other hand, the resin composition forming the adhesive layer 32 can be formed from a thermoplastic resin composition, a highly viscous resin composition, a curable resin composition, or the like, by appropriately selecting a filler exhibiting adhesiveness or adhesiveness depending on the use of the tape obtained by slitting the laminated film 30, the presence or absence of the filler, or the like. For example, in the case of using a tape as an adhesive material for sealing an electronic component or the like, the resin composition for forming an adhesive layer can be a curable resin composition containing a polymerizable compound and a polymerization initiator, similarly to the resin composition for forming an insulating resin layer described in WO2018/074318a1 publication. The adhesive may be a so-called hot-melt adhesive material containing no 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 a combination thereof may be used. For example, a thermal cationic polymerization initiator is used as the thermal polymerization initiator, an epoxy resin is used as the thermal polymerizable compound, a photo radical polymerization initiator is used as the photo polymerization initiator, and an acrylate compound is used as the photo polymerizable compound. As the thermal polymerization initiator, a thermal anionic polymerization initiator may be used. As the thermoanionic polymerization initiator, a microcapsule-type latent curing agent in which an imidazole-denatured product is used as a core and the surface thereof is covered with polyurethane is preferably used.

The lowest melt viscosity of the entire adhesive layer formed of such an insulating resin composition is not particularly limited, but may be 100Pa · s or more at the point of film formation, and is preferably 1500Pa · s or more in order to suppress useless flow of the filler when thermocompression bonding the adhesive layer 32 to the article. On the other hand, the upper limit of the minimum melt viscosity is not particularly limited, but is preferably 15000Pa · s or less, and more preferably 10000Pa · s or less, as an example. As an example, the minimum melt viscosity can be determined using a rotational rheometer (TA instrument) using a measuring plate having a diameter of 8mm and a constant measurement pressure of 5g, and more specifically, can be determined as a temperature rise rate of 10 ℃/min and a measurement frequency of 10Hz in a temperature range of 30 to 200 ℃ and a load fluctuation of 5g with respect to the measuring plate. The minimum melt viscosity can be adjusted by changing the type and amount of the fine solid substance contained as the melt viscosity adjuster, the adjustment conditions of the resin composition, and the like.

(adhesion of adhesive layer)

Peelability

The adhesion of the adhesive layer 32 to the base film 31 and the cover film 33 is weaker than that of the adhesive layer 32 in the case where the adhesive layer 32 is attached to a given article in accordance with the use of the tape, and the base film 31 and the cover film 33 can be peeled from the adhesive layer 32. Generally, after peeling the cover film 33, the adhesive layer 32 was attached to an article and the releasability of the base film 31 was evaluated. The base film 31 and the cover film 33 are peelable from the adhesive layer 32 means that a cellophane tape is adhered to the base film 31 or the cover film 33 and peeled off as described above, or the base film 31 or the cover film 33 is pinched and peeled off with tweezers, whereby these films can be easily peeled off from the adhesive layer 32, but as a specific index, when the laminated film before slitting is cut into a width of 5cm and a length of 15cm and a T-type peel test (JIS K6854) is performed as a peel test, the adhesive strength is set to 0.005 to 0.2N. The evaluation may be performed by a 180 ° peel test or a 90 ° peel test depending on the material, thickness, and the like of the base film 31. Generally, the cover film 33 is peeled off from the base film 31 and the adhesive layer 32 by using a cellophane tape, and after the adhesive layer 32 is attached to an article, the base film 31 is peeled off by using tweezers.

Stability of

On the other hand, when the laminate film 30 is slit into a tape and the tape is wound into a reel by a winding device as a wound mounted body, or when the wound mounted body is assembled to a connecting device and the tape is pulled out from the wound mounted body when the tape as the wound mounted body is used as an adhesive material, a pulling force (tension) is applied to the tape in the longitudinal direction of the tape. Then, in the case where such a pulling force is applied to the tape, it is preferable that the base material film 31 and the adhesive layer 32 are not peeled. That is, conventionally, in a connecting device, a tape length required for winding a mounted body is usually 5m or more, preferably 10m or more, and a pulling force applied in a longitudinal direction of the tape when the tape is pulled out from the wound mounted body is generally about 1N to 5N. Further, in the case where a trouble occurs in the operation of the connecting device, sometimes the spool is locked and a tension of 5 to 6N is applied to the tape. Therefore, it is necessary to assume that a load of about 5N is applied to the belt. Then, it is preferable to maintain the adhesion state of the base film and the adhesive layer or the connection of the reel and the base film under the tension (ultrasonic welding or connection of a lead extending from the reel and the base film by an adhesive film such as a silicon tape).

However, in the case of making the tape into a thin width, depending on the case, it is concerned that the substrate film is broken or the substrate film is peeled from the adhesive layer if a previous pulling force is applied to the tape. Therefore, when winding or unwinding a narrow tape by using existing equipment as much as possible, the tension applied in the longitudinal direction of the tape may be about 0.5N, preferably less than 1N. The upper limit is more preferably 0.7N or less, and still more preferably 0.3N or less.

In order to meet the requirement for practical use that such winding or drawing be possible, the adhesive layer 32 is required to have stability such that the base film 31 and the cover film 33 are not peeled from the adhesive layer 32 when a tensile force of 0.5N or more, preferably 1N, more preferably 5N is applied in the longitudinal direction to the adhesive layer 32 having a length of 1m or more, preferably 5m or more, which is slit into a laminated tape having a width of 0.1mm or more and 0.5mm or less by the method of the present invention. Further, the aforementioned peelability is a property related to an upper limit of the adhesion of the adhesive layer 32 to the substrate film 31 and the cover film 33, but the stability is a property related to a lower limit of the adhesion.

The stability test is preferably carried out simply. Thus, as a test method, the following test can be cited: the test length of the laminated tape was set to 1m, one end of the laminated tape cut to a length of 1m was fixed, and the other end was loaded with 0.5N, preferably 1N, more preferably 5N, to observe whether or not the base film 31 and the adhesive layer 32 were peeled. Further, as a more practical test method, the following test can be cited: the tape was pulled out from the wound body by 1m or more, and the tape was subjected to a load of 0.3N, 0.5N, 1N or 5N at the end portion thereof, and the presence or absence of peeling was observed. The tape may be pulled out over the entire length of the wound body and the presence or absence of separation may be observed at any 20 or more, preferably 50 or more positions. In such a test, as an example of an index of the adhesion force required in terms of practical use, there can be mentioned: (i) in the case where the laminated film is slit into a laminated tape having a width of 0.1mm or more and 0.5mm or less by the method of the present invention, the cover film is peeled off and used as a wound mounting body of a tape of an adhesive layer and a base film, the tape is pulled out by a length of 1m from the wound mounting body and a coupling position of a core of a reel and the tape is fixed, a coupling position angle α (japanese patent application laid-open No. 2017-137188) is set to 90 °, and a tensile force of 0.3N, preferably 0.5N, more preferably 1N, further preferably 5N is applied by a load of a static load to an end portion of the tape, the base film is not peeled off from the adhesive layer, and in addition, extrusion to an extent that the pulling-out is not affected occurs; (ii) in a test piece of test length 1m in which the laminated film is arbitrarily cut out from a laminated tape slit to a width of 0.1mm to 0.5mm by the method of the present invention, the base material film 31 is not peeled from the adhesive layer 32 under the application of a tension of 0.5N, preferably 1N, more preferably 5N in the lengthwise direction of the test piece; (iii) when the entire tape is pulled out by hand from a wound mounting body in which the tape of the adhesive layer and the base film is wound around the winding core at 0.5N for 5m or more, the peeling of the adhesive layer and the base film is not visually confirmed over the entire length of the tape (details are described in examples described later). The method of (iii) is preferable from the point of carrying out the test easily. Even when the test piece was cut to a test length of about 1m and a load was applied to both ends by hand (about 1N to 5N), it was confirmed that the base film and the adhesive layer did not peel.

If the laminated tape has the above adhesive force, even when the tape is pulled out from the roll-up mounted body, preferably 1m or more, more preferably 5m or more, by winding the laminated tape around the roll-up mounted body preferably having a length of 5m or more, 10m or more, 50m or more, and further 100m or more, the base film 31 can be used for sealing the electronic component without peeling from the adhesive layer 32 in the pulled-out tape.

Adhesion to the object to be connected

On the other hand, as a method for testing the adhesion force required for the adhesive layer from the viewpoint of the adhesion force to the connection object such as the electronic component and the substrate, the following method can be mentioned: a peel test was carried out in which a 2 cm-long piece arbitrarily picked up from the laminated tape (or a piece obtained by cutting a 1m test piece of the laminated tape of (ii) above) was temporarily stuck (for example, stuck at 45 ℃) to the raw glass from the adhesive layer side and only the end of the base film 31 (or the cover film 33) was pinched and removed with tweezers, and in this peel test, it was successful that only the base film 31 (or the cover film 33) could be removed and the adhesive layer could be stuck to the raw glass without changing the shape. In this peeling test, success with an N number of 20 or more and 75% or more is preferable, success of 80% or more is more preferable, and success of 90% or more is further preferable.

(attachment of connecting tape)

In order to attach a lead wire when the wound package starts to be wound or unwound to the laminated film 30, or to make the first laminated film and the second laminated film long by bonding them, a connecting tape may be attached to the laminated film 30. The joint portion can be regularly or randomly formed into a plurality of portions. In addition, in the mounting of the laminated film and the lead, the base film 31 of the laminated film 30 and the lead can be connected together by a connecting tape. The laminate film may be attached to the lead by a known method such as ultrasonic welding.

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

When slitting the portion of the laminated film 30 to which the coupling tape is attached, the slitting blade 11 deeply enters the laminated body of the laminated film 30 and the coupling tape 35 as shown in fig. 5. Therefore, according to the conventional slitting device, the distance between the adjacent blades is significantly narrowed with respect to the surface of the laminated body on the entry side of the slitting blade 11, and the strong compressive force F is applied from the side surface of the slitting blade 11 to the surface on the opposite side, so that the cover film 33 or the base film 31 and the adhesive layer 32 are easily peeled off, or the adhesive layer 32 is easily pushed out from the side surface of the slit laminated body. In contrast, according to the present invention, even when the coupling tape 35 is attached to the laminated film 30, such peeling or squeezing can be suppressed.

< laminated tape >

The laminated tape of the present invention is a tape obtained by slitting the laminated film 30 by the above-described slitting method. Therefore, the tape is a laminated tape in which an adhesive layer is laminated on a base film so as to be peelable, and the upper limit of the tape width is 0.5mm or less, particularly less than 0.5mm, more preferably 0.4mm or less, and still more preferably 0.3mm or less. The lower limit is 0.1mm or more, preferably 0.15mm or more, and more preferably 0.2mm or more.

The laminated tape has such a feature that: when one end of the test piece was fixed so as to have a test length of 1m cut out arbitrarily from the tape and a tension of 0.3N, 0.5N, or 1N was applied to the other end, the base film and the adhesive layer did not peel off, and in the wound-up mounted body, extrusion of the adhesive layer 32 did not occur. In addition, when the tape is cut into pieces of 2cm in length, the adhesive layer 32 is adhered to the raw glass, and only the end of the base material film 31 is pinched and removed with tweezers, the laminated tape satisfies a request for practical use that the adhesive layer is difficult to peel from the raw glass, and can be subjected to so-called adhesion or transfer.

For the sake of disposability, a winding attachment body that winds the tape around a reel is preferable. From the viewpoint of practical use, the tape length in the wound-mounted body is preferably 5m or more and 5000m or less, more preferably 50m or more and 1000m or less, and further preferably 500m or less. Generally, if the tape width is made narrow, the wound package is likely to be clogged, but the laminated tape of the present invention is less likely to clog the wound package, and even if the tape is pulled out from the wound package by 5m or more, peeling does not occur between the base material film 31 or the cover film 33 and the adhesive layer 32 in the pulled tape.

In general, a floating (discolored portion) may occur visually at the end of a slit of a laminated tape obtained by slitting a laminated film. If the tape width is 0.5mm or less and becomes narrow, the floating of both ends of the laminated tape is likely to cause unnecessary peeling of the base film and the adhesive layer. However, according to the present invention, since the laminate film is slit by the sharp double blade, even if the presence or absence of the floating is checked at an arbitrary position of 20 or more, preferably 50 or more, from the entire length of the tape forming the wound mounted body by visual observation, it is difficult to observe the floating. Even when the floating is observed along the end of the slit of the laminated tape, the floating length is less than 5cm, the width is 40% or less, particularly 1/3 or less, with respect to the tape width, and the peeling between the base film and the adhesive layer can be suppressed.

As described above, according to the laminated tape of the present invention, since the base film and the adhesive layer are less likely to be misaligned and the occurrence of blocking or floating is less likely to occur, the wound and drawn-out workability of the wound and mounted body is excellent, and when the tape cut out from the wound and mounted body is attached to the target member, the misalignment is less likely to occur at the attachment position. Therefore, the laminate tape of the present invention can be used in various applications as a thin-width adhesive material or an adhesive material. In this case, the kind of the resin composition constituting the adhesive layer 32 and the like are appropriately selected depending on the member to which the tape is to be attached.

Examples

Example 1

The following evaluation was performed as a wound package by forming a base film from a peeled PET film having a thickness of 38 μm and an adhesive layer from an acrylic thermosetting resin (adhesive film, product of dexericals) having a thickness of 10 μm, slitting a laminated film formed from a PET film having a thickness of 12 μm into a tape having a width of 0.3mm and a length of 100m 1 time by using a cutter blade shown in fig. 2, peeling off the cover film, applying a tension (winding tension) of 0.3 to 0.6N to a flanged winding core (flange pitch of 0.4 mm) having a diameter of 90mm, and winding the base film and the adhesive layer.

(1) Float up

The tape of 100m wound as a wound-up mounted body was pulled out by hand, and a test area 20 having a length of 10cm at an arbitrary position of the pulled-out tape was visually observed, and evaluated based on the following items a, b, and c regarding the presence or absence of floating under the following criteria.

a: there is no floating of more than 5cm in length

b: there is no buoyancy of 1/3 with a width exceeding the band width

c: the position of the float with length less than 5cm or the float with width less than 1/3 is below 5

Evaluation A: all cases of abc

Evaluation B: case of ab being satisfied at the same time

Evaluation C: in addition to the above-mentioned evaluation A and evaluation B

The evaluation result was evaluation a. In addition, in terms of practical use, if the evaluation B is satisfied, there is no problem, and it is more preferable to satisfy c.

(2) Peeling off

In the above test, it was confirmed that peeling did not occur at 50 positions in total, which were the positions where the floating was visually observed and the other 30 positions. In the test, the full length was pulled out while performing visual observation, but substantially no peeling occurred.

In addition, extrusion of the adhesive layer, which is an obstacle to handling, did not occur, and adhesion of the adhesive layer to the flange could not be confirmed.

The results (1) and (2) are not limited to the cutting by the cutting blade.

Description of the symbols

1 slitting device

2 film backing-off device

3 film

4 Carrier film

5 backing-off device of carrier film

6 laminating roller

10 band knife roller

11 cutting and cutting knife and circular knife

12 roller

Region 13

14 large diameter part

15 bearing

16 gears

17 guide part

18 adjusting screw

19 bolt

20 anvil roll

25 bearing

26 Gear

30 laminated film

31 base material film

32 adhesive layer

33 cover film

35 connecting belt

Cutting edge angle of alpha cutting knife

d1 gap between the point of slitting knife and anvil roll

Amount of incision of d2 slitting knife into carrier film

F compressive force

h edge height of cutting knife

L1, L2 rotation axis

p pitch of slitting knives.

Claims

1. A slitting device which comprises a knife-carrying roller and an anvil roller provided with a plurality of disk-shaped slitting knives at a predetermined pitch and which slits a film by a scribing and cutting method,

a carrier film transfer mechanism for interposing the carrier film between the slit film and the anvil roll,

the cutting edge angle of the slitting knife is below 30 degrees,

the distance between the slitting knives is less than 0.5 mm.

2. The slitting device according to claim 1, wherein the cutting edge angle of the slitting blade is 10 ° or more.

3. The lancing device according to claim 1 or 2, wherein the pitch of the lancing blades is 0.1mm or more and 0.4mm or less.

4. The slitting device according to any one of claims 1 to 3, wherein a cutting edge height of the slitting blade is 0.05mm or more and 0.8mm or less.

5. The slitting device according to any one of claims 1 to 4, wherein there is an adjustment mechanism that moves the mounting position of the bladed roll relative to the anvil roll.

6. A slitting method of a scribing and cutting method in which a laminated film and a carrier film are laminated on a base film so that an adhesive layer is peelable from the laminated film on the side of a knife roll, the laminated film and the carrier film are repeatedly passed between a knife roll and an anvil roll provided at a predetermined pitch by a plurality of disk-shaped slitting knives to slit the laminated film,

the cutting edge angle of the slitting knife is below 30 degrees,

the pitch of the slitting knives is set to 0.5mm or less.

7. The slitting process according to claim 6, wherein the cutting edge angle of the slitting blade is 10 ° or more.

8. The slitting method according to claim 6 or 7, wherein a pitch of the slitting blades is set to 0.1mm or more and 0.4mm or less.

9. The slitting process according to any one of claims 6-8, wherein the laminated film is a film in which a cover film is peelably laminated to an adhesive layer.

10. The slitting process according to any one of claims 6 to 9, wherein a tie tape is attached to the laminated film.

11. A laminated tape obtained by slitting a laminated film in which an adhesive layer is peelably laminated to a base film by the slitting method according to any one of claims 6 to 10.

12. A laminated tape in which an adhesive layer is laminated on a base film in a peelable manner, wherein the tape width is 0.5mm or less, and wherein the base film and the adhesive layer are not peeled off when one end of the laminated tape having a length of 1m cut off from the laminated tape at will is fixed and a tension of 1N is applied to the other end.

13. The laminated tape according to claim 12, wherein the tape width is 0.1mm or more and 0.4mm or less.

14. The laminate tape of claim 12 or 13, wherein the cover film is releasably laminated to the adhesive layer.

15. A laminated tape according to any one of claims 12-14, wherein a tie tape is attached.