CN113613853B

CN113613853B - Lancing device, lancing method, and laminated tape

Info

Publication number: CN113613853B
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: 2024-04-09
Anticipated expiration: 2040-03-31
Also published as: CN113613853A; TW202042994A; KR20210132119A; JP2020168715A

Abstract

The laminated film 30 is formed into a knife roll side 10, and the laminated film 30 and the carrier film 4 having the adhesive layer 32 formed on the base film 31 in a peelable manner are repeatedly passed between the knife roll 10 and the anvil roll 20 provided with a plurality of disk-shaped slitting knives 11 at a pitch of 0.5mm or less, and the laminated film 30 is slit by a scoring and cutting method. The cutting edge angle of the slitting knife 11 is set to 30 DEG or less. Thus, the laminated film in which the adhesive layer is laminated on the base film in a peelable manner is slit to have a band width of 0.5mm or less so that the base film and the adhesive layer are not peeled off and extrusion of the adhesive layer does not occur.

Description

Lancing device, lancing method, and laminated tape

Technical Field

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

Background

A long laminated tape in which an adhesive layer is laminated on a base film in a releasable manner is used as a transfer ribbon or the like for transferring graphics, characters, 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 laminated on a base film in a peelable manner.

Long laminated tapes in which an adhesive layer is laminated on a base film in a peelable manner are also used as an adhesive material for packaging electronic parts on a substrate, and in recent years, a thin laminated tape is demanded. However, if the laminate film in which the adhesive layer is peelably laminated on the base film is slit to a thin width, there arises a problem that the base film and the adhesive layer are peeled off due to the slit. In contrast, there is a large-scale process as follows: the entire apparatus for slitting the laminated film by a shearing and cutting method using a disk-shaped upper blade and a disk-shaped lower blade is covered with a cover, and the temperature change 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 bandwidth of 0.5mm to 4 mm.

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

Prior art literature

Patent literature

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

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

Patent document 3: japanese patent laid-open 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 thin-width tape having a width of 0.5mm is obtained by slitting a laminated film, but a detailed discussion for slitting a long length with a thin width of 0.5mm or less is not made. The thinner the film is, the more easily the problem of peeling the substrate and the adhesive layer described in patent document 2 is. Therefore, for a belt having a small width of 0.5mm or less, there is a concern that the yield of the product is lowered.

According to the disclosure of patent document 3, the polyester film can be slit to have a width of 2mm using a cutter roll with a cutting angle of 70 °. However, according to the method described in patent document 3, if the laminated film in which the adhesive layer is laminated on the base film so as to be peelable is slit to have a band width of 0.5mm or less, the pitch of the blade in the knife roll is narrowed, and thereby the surface of the slit laminated film on the side of the penetration of the blade is strongly compressed in the slit width direction compared with the surface on the opposite side thereof, and there is also a problem of peeling or extrusion of the adhesive layer.

In contrast, the present invention has the following problems: in the case where the base film and the adhesive layer are not peeled off, the laminated film in which the adhesive layer is peelably laminated to the base film is slit to have a band 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 inventors have conceived the following to complete the present invention: in a dicing system using a knife roll and an anvil roll, a carrier film is used, and if the dicing knife of the knife roll is set to a specific cutting angle, the dicing knife of the knife roll is set to a pitch of 0.5mm or less, particularly less than 0.5mm, whereby the laminate film having the adhesive layer laminated on the substrate film in a peelable manner can be slit without peeling the substrate film and the adhesive layer, and extrusion of the adhesive layer from the slit tape can be suppressed.

That is, the present invention provides a slitting device which is provided with a knife roll and an anvil roll having a plurality of disk-shaped slitting knives arranged at predetermined intervals and slits a film by a scoring and cutting method, and which is provided with a carrier film conveying mechanism for interposing a carrier film between the slit film and the anvil roll,

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

the pitch of the slitting knife is below 0.5mm.

The present invention also provides a slitting method of a scoring and cutting method in which a laminate film is formed on a side of a cutter roll and an adhesive layer is releasably laminated on a base film, and a carrier film is repeatedly passed between the cutter roll and an anvil roll, in which a plurality of disk-shaped slitting blades are provided at predetermined pitches, to slit the laminate film,

the cutting angle of the slitting knife is less than 30 degrees,

the pitch of the slitting knife is set to be less than 0.5mm.

The present invention also provides a laminate tape obtained by slitting a laminate film in which an adhesive layer is releasably laminated to a base film by the slitting method described above. In addition, a laminated tape is provided as follows: the adhesive layer is a laminated tape in which an adhesive layer is laminated on a base film in a peelable manner, the band 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

If the slitting device of the present invention is used to slit a laminate film having an adhesive layer releasably laminated to a base film by the slitting method of the present invention, a laminate 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 having a length of 1m is arbitrarily cut 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 film and the adhesive layer are not peeled off. Therefore, even if the laminate tape is wound on a reel and used as a wound body and pulled out from the wound body, the base film and the adhesive layer are not peeled off due to tension at the time of winding or pulling out. In addition, extrusion of the adhesive layer does not occur in the wound body of the laminated tape. Therefore, occurrence of clogging can be prevented in the case of being a wound body. Therefore, the laminated tape is useful as an adhesive material for adhering an adhesive layer to an article in a thin width, and is also useful as an adhesive material if the adhesive layer is formed from 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 an arrangement region of a slitting blade (cutting blade) of a slitting device for slitting a laminated film.

Fig. 3A is a sectional view showing an assembled configuration of a knife roll and an anvil roll of the device of the embodiment.

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

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

Fig. 4 is an enlarged cross-sectional view of a slitting blade portion when slitting a laminate film by a slitting blade of the apparatus of the embodiment.

Fig. 5 is an enlarged sectional view of a slitting blade portion when slitting laminated films joined together in the longitudinal direction by a joining tape.

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

Detailed Description

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

< integral Structure of lancing 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 knives when a film 3 is slit by the slitting device 1.

As shown in fig. 2, the slitting device 1 is provided with the following means for slitting the film 3 by a score cut (score cut): a cutter roll 10 having disc-shaped slitting cutters 11 arranged at a predetermined pitch along a direction of a rotation axis L1 of the roll 12 in a region 13 of the cylindrical roll 12; and a cylindrical anvil roll 20. Since the upper blade and the lower blade are in contact with each other in the shear cutting method, the blades are not in contact with each other in the scoring cutting method, and thus the life of the blades can be prolonged.

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 device, a winding device for winding the even-numbered rows of the bands 3a and a winding device for winding the odd-numbered rows of the bands 3b may be provided, respectively, so that adjacent bands among the plurality of rows of the bands obtained by slitting the film are wound in mutually different directions. In fig. 1, the even-numbered strings 3a are wound upward and the odd-numbered strings 3b are wound downward, but the even-numbered strings may be wound downward and the odd-numbered strings may be wound upward.

In the slitting device 1, a carrier film winding portion (not shown) is provided as a carrier film conveying mechanism for interposing the carrier film 4 between the slit film 3 and the anvil roll 20, and the carrier film winding portion winds the carrier film unwinding device 5, the pair of laminating rolls 6 for superposing the carrier film 4 and the film 3, the end portions (film ears) of the slit film, and the carrier film 4 together.

As described later, in the lancing device 1, not only the single-layer resin film or the laminated film in which the plurality of resin layers are bonded or welded, but also the laminated film 30 (fig. 4) in which the adhesive layer 32 is laminated on the base film 31 in a peelable manner can be lanced to a width of 0.5mm or less, particularly a width of less than 0.5mm.

< lancing knife >

The slitting knife 11 provided to the belt knife roll 10 is preferably double-edged, for the purpose of stabilizing the slitting direction. If the slitting knife is made to be a single blade (i.e., if one of the 2 blade surfaces forming the knife edge is made to be a flat surface and the other is made to be a knife edge surface), the force applied to the slitting knife in the film width direction at the time of slitting is greater on the knife edge surface than on the flat surface, and the film is bent and conveyed in the knife edge side direction, so that there arises a need to expand the margin in the width direction of the slit film, and the amount of waste of the film end portion also increases. In contrast, by using the double blade, the forces applied to the slitting blade in the film width direction are equal on both side surfaces of the blade during slitting, and therefore, bending of the film in the film conveying direction can be prevented, and the amount of waste at the film end can be reduced.

The cutting angle α of the slitting blade 11 is preferably 30 ° or less, particularly 25 ° or less, in order to be able to slit the laminated film having the adhesive layer provided in the substrate film in a peelable manner into a thin width point having a width of 0.5mm or less, particularly a width of less than 0.5mm without peeling the substrate film and the adhesive layer. On the other hand, the blade angle α is preferably 10 ° or more from the point of durability of the slitting blade.

The pitch p of the slitting blade 11 is determined in accordance with the required band width of the band obtained by slitting the film 3, but in the present invention, the upper limit of the band may be 0.5mm or less, particularly less than 0.5mm, and further 0.4mm or less so as to be compatible with a narrow band. The lower limit is preferably 0.1mm or more.

The blade height h of the slitting blade 11 is preferably a high height from the point of stabilizing the slitting accuracy, and the lower limit 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 blade height h of the slitting blade is preferably a low height from the point of durability of the slitting blade, and the upper limit is preferably 0.8mm or less, more preferably 0.7mm or less, and still more preferably 0.5mm or less.

As described in patent document 3, if the pitch is set to 0.5mm or less by setting the cutting angle α of the slitting knife to 70 °, if the laminated film in which the adhesive layer is laminated on the base film in a peelable manner is slit, 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 which is not exposed to the film surface, and the surface of the laminated film 30 on the side of the slitting knife 11 which is intruded receives a strong compressive force F in the slit width direction as compared with the surface on the opposite side. Therefore, in the slit tape, the base film 31 or the cover film 33 is peeled from the adhesive layer 32, or the following problems occur: the adhesive layer 32 is extruded from the sides of the tape and if the tape is made into a wound mounting, blocking occurs. In contrast, in the present invention, since the edge angle of the slitting blade 11 is reduced to 30 ° or less, even if the pitch of the slitting blade 11 is set to 0.5mm or less, particularly 0.1mm or more and 0.4mm or less, the compressive force F applied to the face of the slitting blade 11 on the invasion side as shown in fig. 4 is reduced, and the laminated film 30 in which the adhesive layer 32 is laminated on the base film 31 in a peelable manner can be slit without causing peeling of the adhesive layer 32, and extrusion of the adhesive layer 32 from the side face of the tape can be suppressed. In the case of the tape having a small width, the force applied in the slit width direction per unit cross-sectional area of the tape is relatively large as compared with the tape having a large width, and thus extrusion of the adhesive layer is liable to occur. Therefore, it can be said that the extrusion inhibition of the adhesive layer 32 becomes high in difficulty if the bandwidth becomes narrow.

As the cutter roll 10 having the region 13 in which the slitting cutters 11 are arranged at the above-described cutting angle α and pitch p, a cutting cutter obtained by cutting a metal roll as shown in fig. 2, a combination cutter in which circular cutters at the cutting angle α are superimposed in the rotation axis direction, 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 roller 12 such as carbon steel, and cutting the free-cutting alloy layer by a precision cutting device using a diamond tool or the like. The combination blade is obtained by forming each slitting blade 11 by cutting and combining the slitting blades at a predetermined pitch. The slitting knife is configured such that the cutting angle is 30 ° or less, the pitch is 0.5mm or less, preferably less than 0.5mm, and more preferably 0.4mm or less, and the effect of the present invention is not particularly limited.

As the free-cutting alloy (i.e., alloy excellent in machinability) forming the slitting knife, nickel-phosphorus alloy, hard copper alloy, tool steel, cemented carbide alloy, and the like can be used. The alloy having a hardness of 475 or more, more preferably 500 or more, still more preferably 550 or more, and particularly preferably 1400 or more, is preferable from the point of durability of the free-cutting alloy.

< Assembly of the Belt knife roll and anvil roll >

In the lancing device 1, as shown in fig. 3A, the cutter roll 10 and the anvil roll 20 are supported by bearings 15 and 25, respectively, and are disposed so that the rotation axes L1 and L2 become parallel. The direction of the rotation axes L1, L2 may be horizontal or vertical as long as the rotation axes L1, L2 are parallel. In order to stabilize the running of the laminated film 30, it is preferable to dispose the knife roll 10 on the anvil roll 20 while making the directions of the rotation axes L1, L2 horizontal. On the other hand, it is preferable that the directions of the rotation axes L1 and L2 be vertical at the point where foreign matter is hard to adhere to the laminated film 30.

The cutter roll 10 and the anvil roll 20 are coupled by gears 16 and 26, and a drive mechanism for rotating these rolls in the arrow direction in fig. 1 is provided. On the other hand, a driving mechanism may be provided for rotationally driving each of the cutter roll 10 and the anvil roll 20.

The amount d2 (fig. 2) of the slitting blade 11 to cut into the carrier film 4 is preferably 10 to 100 μm, more preferably 10 to 50 μm, still more preferably 10 to 20 μm, from the point of continuously and stably slitting. The lancing device 1 is preferably provided with the following adjustment mechanism: the mounting position of the cutter roll 10 is moved relative to the anvil roll 20 so that the cut-in 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 that moves the cutter roll 10 along the guide 17 by the adjustment screw 18 can be provided.

On the other hand, in the case of using a carrier film having a constant film thickness, as shown in fig. 3B, a large diameter portion 14 protruding toward the anvil roll 20 side from the edge of the slitting blade 11 may be provided on the belt blade roll 10, and the large diameter portion 14 may be pressed against the anvil roll 20. The pushing force for pushing the large diameter portion 14 against the anvil roll 20 can be about 800N. If the thrust force is excessively increased, a problem of deflection occurs in the cutter roll 10. As shown in fig. 3C, a combination of round blades having a thickness of 0.5mm or less, which are obtained by finishing tool steel, cemented carbide, or the like into a round shape by cutting, and polishing, may be fixed by bolts 19 to form a combination blade, and the combination blade may form the arrangement region 13 of the slitting blade. In the manner shown in fig. 3C, the mounting positions of the anvil roll 20 and the band knife roll 10 are adjusted by the adjusting screw 18 in the same manner as in fig. 3A, and thus a pushing force for pushing the band knife roll 10 against the anvil roll 20 is not required.

< lancing method >

The slitting method according to the present invention is a method of slitting a laminate film 30 in which an adhesive layer 32 is releasably laminated on a base film 31 by passing the laminate film 30 between the above-described knife roll 10 and anvil roll 20, and is a method of: the laminate film 30 is cut by a scoring and cutting method by making the laminate film 30 the belt cutter roll 10 side and making the carrier film 4 the anvil roll 20 side, and repeatedly passing through the laminate film 30 and the carrier film 4 (fig. 1 and 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, as shown in fig. 4, the base film 31 of the laminated film 30 is generally set to the side of the tape roll 10, and the cover film 33 is generally set to the side of the carrier film 4. In this case, the cover film 33 and the carrier film 4 are bonded to each other and then slit, and the cover film 33 and the carrier film 4 are peeled off from the adhesive layer 32 together after slitting. On the other hand, the cover film 33 of the laminated film 30 may be slit with the cutter roll 10 side and the base film 31 as the carrier film 4 side.

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

The end portion (tab) 3c of the slit laminate film 30 is 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 the slitting blade 11 to be cut into the carrier film 4 is preferably 10 μm or more and 100 μm or less as described above. The total thickness of the slit material (laminate film 30 and 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 material is preferably 270 μm or less (fig. 2). More preferably, the total thickness of the slit is 70% or less, and still more preferably 50% or less, of the blade height h.

The lancing is preferably performed in a clean room, and a cover for covering the entire lancing device is not required to be provided in order to suppress the fluctuation of the ambient temperature, but the cover may be provided.

< laminated film >

As a laminated film 30 to be slit by the slitting method of the present invention, for example, as shown in fig. 4, there can be mentioned 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, which are laminated in order so as to be peelable. Here, the peelable means that the base film 31 or the cover film 33 can be easily peeled from the adhesive layer 32 by adhering the cellophane tape to the base film 31 or the cover film 33 and peeling off the same, or pinching and peeling off the end of the base film 31 or the cover film 33 with a film-use tweezer (hereinafter, tweezer).

As shown in fig. 4, at the time of lancing, the base material film 31 may be disposed on the penetration side of the lancing blade 11, or the cover film 33 may be disposed on the penetration side of the lancing 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. Since the rigidity of the entire film becomes high if the carrier film 4 is laminated on the laminate 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 adhesive layer 32 can be eliminated from being peeled off from the base film 31. On the other hand, the cover film 33 is preferably present at the point of preventing contamination of the laminated tape, and particularly, in the case of obtaining a laminated tape having a narrow width, the cover film 33 is preferably present. The wound body (which is a form of final use as an adhesive material) may be provided with a cover film for preventing contamination, or may be provided without a cover film for improving operability.

(substrate film, cover film)

The base film 31 may be a film made of a thermoplastic resin such as polyethylene, polypropylene, or polyester such as PET. The cover film 33 is provided to prevent contamination of the adhesive layer 32, and can be formed of the same material as the base film 31. The surface of the base film 31 or the cover film 33 is preferably subjected to a peeling treatment. Because it can be separated from the adhesive layer. In order to peel off the cover film first after slitting, a material that is easier to peel off than the base film 31 in the cover film 33 is preferably used.

In the present invention, the adhesive layer 32 having low rigidity and the base film 31 having high rigidity are simultaneously slit and are not separated at the time of slitting, and the adhesive layer 32 and the base film 31 can be peeled off when the laminated tape after slitting is used. Here, since the tensile elastic modulus of polyester such as polyethylene, polypropylene, PET and the like is about 1100 to 4200MPa, the film made of such thermoplastic resin and the adhesive layer 32 having rigidity different from that of the film are slit simultaneously into a thin width of 0.5mm or less, and the film and the adhesive layer are prevented from being separated or peeled off at the time of slitting, but such slitting can be performed according to the present invention.

(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 laminate or a multilayer body of a plurality of resin layers. The adhesive layer 32 may contain a filler as needed.

(filler of adhesive layer)

When the adhesive layer contains a filler, the filler is appropriately selected from a known inorganic filler (metal, metal oxide, metal nitride, etc.), an organic filler (resin, rubber, etc.), a filler obtained by mixing an organic material and an inorganic material, etc., according to the application of the tape obtained by slitting the laminated film 30. For example, silica filler, titanium oxide filler, styrene filler, propylene filler, melamine filler, various titanates, or the like can be used for optical use or matting use. In the use of a film for a 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 rubber particles, silicone rubber particles, and the like can be contained. In the application of the package of electronic parts, the filler may have conductivity or insulation. In the case where the filler has insulating properties, 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, in the case where the tape is used for packaging electronic parts, the particle diameter of the filler is preferably 1 μm or more, more preferably 2.5 μm or more and 30 μm or less.

The particle size herein means an average particle size. The average particle diameter can be obtained from a top view image or a cross-sectional image of the adhesive layer 32 of the laminated film 30. The average particle diameter of the filler, which is the raw material particle before the filler is contained in the adhesive layer 32 of the laminated film 30, can be obtained using a wet flow particle diameter/shape analyzer FPIA-3000 (Malvern). The number N is 1000 or more, preferably 2000 or more, and more preferably 5000 or more. On the other hand, the filler may include a filler having a particle diameter of less than 1. Mu.m. Examples of the filler having a particle diameter of less than 1 μm (so-called nanofiller) include fillers for viscosity adjustment. The size can be obtained by observation with an electron microscope (TEM, SEM). The number of N is preferably 200 or more.

As the filler, a filler having a function such as quantum dots may be included. The size of such a filler is not particularly limited, but is preferably 2nm or more, more preferably 10nm or more. The size can also be obtained 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 a particle diameter of 1 μm or more as described above unless specifically indicated in advance. That is, nanofillers used as surface modifiers or fillers are excluded.

In the adhesive layer, the fillers may be kneaded in the resin and randomly dispersed, may not be in contact with each other in a plan view, or may be arranged in a regular pattern in which predetermined arrangements are repeated in a plan view. The number density of the filler is appropriately adjusted within a range not affecting the slit of the film, and can be set to, for example, 30 to 100000 pieces/mm in the field of view of the surface ² . The number density is preferably measured in the following manner: the filler in the adhesive layer was observed by using an optical microscope or a metal microscope in a plan view so that the total area of 10 or more was 2mm ² The total filler number is 200 or more.

(adhesive layer-forming resin composition)

On the other hand, the resin composition forming the adhesive layer 32 may be formed of a thermoplastic resin composition, a high-viscosity adhesive resin composition, a curable resin composition, or the like, by appropriately selecting a filler exhibiting adhesiveness or adhesiveness according to 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 the tape as an adhesive material for packaging electronic parts or the like, the adhesive layer-forming resin composition can be used as a curable resin composition containing a polymerizable compound and a polymerization initiator, as in the resin composition for forming an insulating resin layer described in WO2018/074318 A1. The adhesive may be a so-called hot-melt adhesive which 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 a combination of these 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 thermal anionic polymerization initiator, a microcapsule type latent curing agent having an imidazole denatured product as a core and covering the surface thereof with polyurethane is preferably used.

The minimum melt viscosity of the whole adhesive layer formed of such an insulating resin composition is not particularly limited, but can be set to 100pa·s or more from the point of film formation, and is preferably 1500pa·s or more in order to suppress wasteful flow of the filler when the adhesive layer 32 is thermally press-bonded to an article. On the other hand, the upper limit of the lowest melting viscosity is not particularly limited, but is preferably 15000pa·s or less, more preferably 10000pa·s or less, as an example. As an example, the minimum melt viscosity can be obtained by using a measuring plate having a constant measuring pressure of 5g and a diameter of 8mm by using a rotary rheometer (manufactured by TA instruments), more specifically, by changing the load of 5g on the measuring plate at a temperature range of 30 to 200 ℃ at a heating rate of 10 ℃/min and a measuring frequency of 10 Hz. The minimum melt viscosity can be adjusted by changing the type or amount of the fine solid substance contained as the melt viscosity adjusting agent, the adjusting conditions of the resin composition, and the like.

(adhesion of adhesion layer)

Strippability (peelability)

The adhesion force 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. In general, after peeling the cover film 33, the adhesive layer 32 is stuck to an article and the peelability of the base film 31 is evaluated. The fact that the base film 31 and the cover film 33 can be peeled from the adhesive layer 32 means that, as described above, the base film 31 or the cover film 33 can be peeled by adhering a cellophane tape thereto, or by pinching and peeling the ends of the base film 31 or the cover film 33 with forceps, and these films can be easily peeled from the adhesive layer 32, but as a specific index, when the laminated film before slitting is cut into a laminate film having a width of 5cm and a length of 15cm and subjected to a T-type peeling test (JIS K6854) as a peeling test, the adhesive strength is 0.005 to 0.2N. Depending on the material, thickness, etc. of the base film 31, it can also be evaluated by a 180 ° peel test or a 90 ° peel test. The cover film 33 is peeled off from the base film 31 and the adhesive layer 32 using a cellophane tape, and after the adhesive layer 32 is attached to an article, the base film 31 is peeled off with tweezers.

Stability

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-up mounting body, or when the wound-up mounting body is assembled to a connecting device and the tape is pulled out from the wound-up mounting body when the tape as the wound-up mounting body is used as an adhesive material, a tensile force (tension) is applied to the tape in the length direction of the tape. Then, in the case where such a tensile force is applied to the tape, it is preferable that the base film 31 and the adhesive layer 32 are not peeled off. That is, in the conventional connecting device, the length of the tape required for winding the mounted body is usually 5m or more, preferably 10m or more, and the tensile force applied in the longitudinal direction of the tape when the tape is pulled out from the wound mounted body is generally about 1N to 5N. Moreover, in the case where a trouble occurs in the operation of the connection device, a lock is sometimes applied to the reel, and a tension of 5 to 6N is applied to the belt. 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 (ultrasonic welding or connection of the lead wire extending from the reel and the base film by an adhesive film such as a silicon tape) under the tensile force.

However, in the case of making the tape a thin width, depending on the case, there is a concern that if a previous tension is applied to the tape, the substrate film breaks, or the substrate film peels off from the adhesive layer. In the case of winding or drawing out the tape with a small width by using the original equipment as effectively as possible, the tension applied in the longitudinal direction of the tape may be about 0.5N, and 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 make such winding or drawing possible, in terms of practical use, when a tensile force of 0.5N or more, preferably 1N, more preferably 5N is applied to the adhesive layer 32 in the longitudinal direction, to slit the adhesive layer 32 into a laminate tape having a width of 0.1mm or more and 0.5mm or less, preferably 1m or more, more preferably 5m or more, by the method of the present invention, the substrate film 31 and the cover film 33 are required to have such stability that they are not peeled from the adhesive layer 32. Further, the aforementioned peelability is a property related to the upper limit of the adhesion force of the adhesive layer 32 to the base film 31 and the cover film 33, but the stability is a property related to the lower limit of the adhesion force.

The stability test is preferably carried out simply. Thus, as a test method, the following test can be exemplified: the test length of the laminate tape was set to 1m, one end of the laminate tape cut to a length of 1m was fixed, and the other end was loaded with 0.5N, preferably 1N, more preferably 5N, and the presence or absence of peeling of the base film 31 and the adhesive layer 32 was observed. Further, as a more practical test method, the following test can be exemplified: the tape was pulled out of the wound body by 1m or more, and the presence or absence of peeling was observed with an end load of 0.3N, 0.5N, 1N or 5N. The entire length of the tape may be pulled out from the wound body and the presence or absence of separation may be observed at 20 or more, preferably 50 or more. In such a test, as an example of an index of adhesion required in terms of practical use, there can be cited: (i) In the case of slitting a laminated film into a laminated tape having a width of 0.1mm or more and 0.5mm or less by the method of the present invention, peeling off the cover film to obtain a wound assembly of the adhesive layer and the tape of the base film, pulling out the tape from the wound assembly by a length of 1m, fixing the connection position between the core of the reel and the tape, and applying a tension of 0.3N, preferably 0.5N, more preferably 1N, still more preferably 5N by a load of static load to the tape end with the connection position angle α (japanese patent application laid-open No. 2017-137188) as 90 ° so that the base film is not peeled off from the adhesive layer and extrusion does not occur to the extent that the pulling-out is affected; (ii) In a test piece of a test length of 1m, in which the laminated film is arbitrarily slit from a laminated tape having a width of 0.1mm or more and 0.5mm or less by the method of the present invention, the base film 31 is not peeled from the adhesive layer 32 when a tensile force of 0.5N, preferably 1N, more preferably 5N is applied in the longitudinal direction of the test piece; (iii) When the tape was pulled out by hand from the wound body in which the adhesive layer and the base film were wound around the winding core by 0.5N by 5m or more, the peeling of the adhesive layer and the base film was 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 viewpoint of easy test. When the test length was cut to about 1m and a load (about 1N to 5N) was applied to both ends by hand, it was confirmed that peeling of the base film and the adhesive layer did not occur.

If the laminated tape has the above adhesive force, the laminated tape is wound around a wound mount body having a length of preferably 5m or more, 10m or more, 50m or more, and further a length of 100m or more, and even when the tape is pulled out of the wound mount body, preferably 1m or more, more preferably 5m or more, the base film 31 can be used for packaging of electronic parts without being peeled off from the adhesive layer 32 in the pulled-out tape.

Adhesion to the connection object

On the other hand, as a test method of the adhesion force required for the adhesion layer from the viewpoint of the adhesion force to the connection object such as an electronic component, a substrate, or the like, the following method can be exemplified: a peeling test was performed in which a piece having a length of 2cm (or a piece obtained by cutting a test piece of the laminated tape of 1m (ii)) 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 by tweezers, and in this peeling test, only the base film 31 (or the cover film 33) was removed, and the adhesive layer was stuck to the raw glass with the shape unchanged. In the peel test, success 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 still more preferable.

(attachment of connecting tape)

In order to attach a lead wire to the laminated film 30 when the wound body starts to be wound or unwound, or to bond the first laminated film and the second laminated film to each other and to lengthen the laminated film, a tie tape may be attached to the laminated film 30. The connection 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 bonded together by the bonding tape. The lamination film may be attached to the lead wire by a known method such as ultrasonic welding.

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

When the joint tape is cut at the portion of the laminated film 30 to which the joint tape is attached, as shown in fig. 5, the cutting blade 11 is deeply advanced into the laminated body of the laminated film 30 and the joint tape 35. Therefore, according to the conventional lancing device, the distance between the adjacent blades is significantly narrowed with respect to the surface of the laminate on the penetration side of the lancing blade 11, and the surface opposite thereto receives a strong compressive force F from the side surface of the lancing blade 11, 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 extruded from the side surface of the lanced laminate. In contrast, according to the present invention, even when the connecting tape 35 is attached to the laminated film 30, such peeling or extrusion can be suppressed.

< laminated tape >

The laminated tape of the present invention is obtained by slitting the laminated film 30 by the slitting method described above. Therefore, the tape is a laminate tape in which an adhesive layer is laminated on a base film so as to be peelable, and the upper limit of the band width is 0.5mm or less, particularly less than 0.5mm, more preferably 0.4mm or less, 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 this feature as follows: when one end of the test piece was fixed so as to be 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 were not peeled off, and extrusion of the adhesive layer 32 did not occur in the wound mounting body. In addition, in the case where the tape is cut into small pieces of 2cm in length and the adhesive layer 32 is adhered to the raw glass and only the end of the base film 31 is pinched and removed with tweezers, the laminated tape satisfies a request in terms of practical use that the adhesive layer is difficult to peel from the raw glass, so-called adhesion or transfer can be performed.

For disposal, the tape is preferably wound around a winding mount of a reel. The length of the tape in the wound body is preferably 5m or more and 5000m or less, more preferably 50m or more and 1000m or less, and still more preferably 500m or less, from the point of practical use. In general, if the band width is made thin, blocking tends to occur in the wound body, but according to the laminated band of the present invention, blocking is hard to occur in the wound body, and even if the band is pulled out of the wound body by 5m or more, peeling does not occur between the base film 31 or the cover film 33 and the adhesive layer 32 in the pulled-out band.

In general, a floating (color change portion) may occur in the end of a slit that is a slit of a laminate tape obtained by slitting a laminate film, when the end is visually recognized. If the width of the tape is 0.5mm or less and becomes a small width, the floating of both ends of the laminated tape is likely to be a factor that causes useless peeling of the base film and the adhesive layer. However, according to the present invention, since the laminated film is slit by a sharp double blade, even if the existence of the floating is examined at 20 or more, preferably 50 or more, arbitrarily from the entire length of the tape forming the wound 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 laminate tape, the floating is less than 5cm in length and the width is 40% or less, particularly 1/3 or less, relative to the tape width, so that peeling of the base film and 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 deviate from each other, and clogging and floating are less likely to occur, so that the winding and pulling-out operability of the wound body is excellent, and deviation in the adhering position is less likely to occur when the tape pulled out and cut from the wound body is adhered to the target member. Thus, the laminated tape of the present invention can be used as an adhesive material or an adhesive material of a thin width in various applications. In this case, the kind of the resin composition constituting the adhesive layer 32 and the like are appropriately selected according to the target member of the adhesive tape.

Examples

Example 1

The following evaluation was performed using a laminate film, in which a base film was formed of a peeled PET film having a thickness of 38 μm and an adhesive layer was formed of an acrylic thermosetting resin (adhesive film, manufactured by Diwise Co., ltd.) having a thickness of 10 μm, and a cover film was slit 1 time into a tape having a width of 0.3mm and a length of 100m from a laminated film formed of a PET film having a thickness of 12 μm using a cutter shown in FIG. 2, the cover film was peeled off, a tension (winding tension) of 0.3 to 0.6N was applied to a flange-mounted roll core (distance between flanges of 0.4 mm) having a diameter of 90mm, and the base film and the adhesive layer were wound.

(1) Float up

All the tapes of 100m as wound bodies were pulled out by hand, and the test areas 20 of 10cm in length at any position of the pulled out tapes were visually observed, and evaluated based on the following items a, b, and c regarding the presence or absence of floating.

a: there is no floating with a length of 5cm or more

b: there is no floating of width exceeding 1/3 of the bandwidth

c: a floating length of less than 5cm or a floating width of 1/3 or less of the bandwidth is present at 5 or less

Evaluation a: satisfying all abc conditions

Evaluation B: at the same time satisfy ab

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

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

(2) Stripping off

In the above test, it was confirmed that peeling did not occur at 50 in total between the portion to be visually observed for floating and the other 30 portions. In the test, the full length was pulled out and visually observed at the same time, but substantially no peeling occurred.

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

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

Symbol description

1. Lancing device

2. Film unwinding device

3. Film and method for producing the same

4. Carrier film

5. Backing film unwinding device

6. Lamination roller

10. Roller with knife

11. Slitting knife and circular knife

12. Roller

13. Region(s)

14. Large diameter portion

15. Bearing

16. Gear wheel

17. Guide part

18. Adjusting screw

19. Bolt

20. Anvil roll

25. Bearing

26. Gear wheel

30. Laminated film

31. Substrate film

32. Adhesive layer

33. Cover film

35. Connecting band

Angle of alpha-slitting knife

d1 Gap between cutter point of slitting cutter and anvil roll

d2 Amount of slitting knife cut into the carrier film

F compressive force

h cutting edge height of slitting knife

L1, L2 rotation axis

pitch of p slitting knives.

Claims

1. A slitting device comprising a knife roll and an anvil roll having a plurality of disk-shaped slitting knives arranged at predetermined intervals, wherein a laminate film having an adhesive layer laminated on a base film in a peelable manner is slit to a band width of less than 0.5mm by a slitting method without peeling the base film and the adhesive layer by a slit which does not cause extrusion of the adhesive layer at all,

the slitting device is provided with a carrier film conveying mechanism which enables the carrier film to be arranged between the film to be slit and the anvil roll,

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

the spacing of the slitting knives from each other is less than 0.5mm,

as a conveying mechanism capable of conveying a film of 5m or more, a film unwinding device and a winding device are provided.

2. The lancing device of claim 1, wherein,

the cutting angle of the slitting knife is more than 10 degrees.

3. The lancing device according to claim 1 or 2, wherein,

the distance between the slitting knives is 0.1mm or more and 0.4mm or less.

4. The lancing device according to claim 1 or 2, wherein,

the blade height of the slitting knife is more than or equal to 0.05mm and less than or equal to 0.8 mm.

5. The lancing device according to claim 1 or 2, wherein,

an adjusting mechanism for changing the mounting position of the belt knife roll relative to the anvil roll is provided.

6. A slitting method of a scoring and cutting method in which a laminate film having an adhesive layer laminated on a base film is formed on a knife roll side, the laminate film and a carrier film are passed repeatedly between a knife roll and an anvil roll, and the laminate film is slit into a slit having a width of less than 0.5mm by a slit in which extrusion of the adhesive layer does not occur at all without peeling the base film and the adhesive layer, the knife roll having a plurality of disk-shaped slitting knives provided at predetermined intervals,

the cutting angle of the slitting knife is less than 30 degrees,

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

after slitting the laminated film into a tape, the tape is wound into a reel by a winding device as a wound body.

7. The lancing method according to claim 6, wherein,

the cutting angle of the slitting knife is more than 10 degrees.

8. The lancing method according to claim 6 or 7, wherein,

the distance between the slitting knives is set to be 0.1mm to 0.4 mm.

9. The lancing method according to claim 6 or 7, wherein,

the laminated film is a film in which a cover film is laminated to an adhesive layer in a peelable manner.

10. The lancing method according to claim 6 or 7, wherein,

a connecting tape is attached to the laminated film.

11. The lancing method according to claim 6, wherein,

the substrate film is peeled off.

12. The lancing method according to claim 6, wherein,

the slit is cut into a long size of 5m or more.

13. A laminated tape obtained by slitting a laminated film having an adhesive layer releasably laminated to a base film by the slitting method according to any one of claims 6 to 10,

in the laminated tape, the base film is peeled off and slit into a long dimension of 5m or more.

14. A laminated tape in which an adhesive layer is laminated on a base film in a peelable manner, the tape width is less than 0.5mm, and the base film and the adhesive layer are not peeled off in the case where one end of a laminated tape of 1m length cut arbitrarily from the laminated tape is fixed and a tension of 1N is applied to the other end,

15. The laminated tape of claim 14, wherein,

the bandwidth is 0.1mm or more and 0.4mm or less.

16. The laminated tape according to claim 14 or 15, wherein,

the cover film is releasably laminated to the adhesive layer.

17. The laminated tape according to claim 14 or 15, wherein,

a connecting band is attached.