TWI863981B - Cutting device, cutting method and laminated tape - Google Patents

Abstract

Between a knife roller 10 and an anvil roller 20 provided with a plurality of disc-shaped cutting knives 11 at intervals of 0.5 mm or less, a laminated film 30 having an adhesive layer 32 laminated on a substrate film 31 in a removable manner and a carrier film 4 are overlapped and passed in a manner such that the laminated film 30 is located on the side of the knife roller 10, and the laminated film 30 is cut by a longitudinal cutting (score cutting) method. The knife angle of the cutting knife 11 is set to be less than 30 degrees. In this way, the laminated film having an adhesive layer laminated on a substrate film in a removable manner is cut into a strip width of less than 0.5 mm in a manner such that the substrate film and the adhesive layer are not peeled off and the adhesive layer is not exposed.

Description

Cutting device, cutting method and laminated tape

The present invention relates to a cutting device and a cutting method for a laminated film in which an adhesive layer is releasably laminated on a substrate film, and a laminated tape obtained by cutting the laminated film.

A long laminated tape having an adhesive layer laminated on a substrate film in a releasable manner is used as a transfer tape for transferring graphics, text, etc. to an object (Patent Document 1). This laminated tape is produced by cutting a laminated film having an adhesive layer laminated on a substrate film in a releasable manner.

A long laminated tape having an adhesive layer laminated on a base film in a removable manner is also used as a bonding material when mounting electronic components on a substrate, and a narrow laminated tape has been required in recent years. However, if the laminated film having an adhesive layer laminated on a base film in a removable manner is cut into a narrow width, the base film and the adhesive layer may be peeled off due to the cutting. In response to this, there is a complicated method as follows: a hood is used to cover the entire device that cuts the laminated film by a shearing method using a disc-shaped upper knife and a lower knife, so as to suppress the temperature change from the time the laminated film is cut to the time it is rolled up (Patent Document 2). According to this method, the laminated film can be cut into narrow strips with a width of 0.5 mm to 4 mm.

On the other hand, in the shearing method using the upper and lower knives, there is a risk that fine knife wear powder generated by the contact between the upper and lower knives will adhere to the tape after cutting. In response to this, there is a method as follows: as a cutting method that does not generate such wear powder and can relax the processing accuracy of the tool required to obtain an aesthetically pleasing cut surface, in the longitudinal cutting (score cutting) method using a knife roller and anvil roller, the film to be cut is cut together with the carrier film (pad material) (Patent Document 3). Prior Art Documents Patent Documents

Patent document 1: Japanese Patent Publication No. 2012-232392 Patent document 2: Japanese Patent Publication No. 2007-90461 Patent document 3: Japanese Patent Publication No. 2003-285293

[The problem that the invention wants to solve]

According to the method described in Patent Document 2, it is possible to cut the laminated film into a narrow strip with a width of 0.5 mm, but there is no detailed study on how to cut the long strip into a narrow strip with a width of less than 0.5 mm. In addition, the narrower the film width, the easier it is to produce the problem of separation of the substrate and the adhesive layer described in Patent Document 2. Therefore, there are concerns about the reduction of the yield rate of the product with a narrow strip with a width of less than 0.5 mm.

According to the description of Patent Document 3, a polyester film can be cut into a width of 2 mm using a knife roller with a blade angle of 70°. However, according to the method described in Patent Document 3, if a laminated film having an adhesive layer releasably laminated on a substrate film is cut into a width of 0.5 mm or less, the distance between the knives in the knife roller becomes narrower, and the surface of the laminated film being cut on the side where the knife enters is strongly compressed in the direction of the cut width compared to the surface on the opposite side, resulting in the problem of peeling or exposure of the adhesive layer.

In this regard, the subject of the present invention is to cut a laminated film in which an adhesive layer is releasably laminated on a base film into a strip having a width of less than 0.5 mm, and in particular less than 0.5 mm, with an aesthetically pleasing cut that does not peel off the base film and the adhesive layer and does not expose the adhesive layer. [Technical means for solving the subject]

The inventor of the present invention conceived that if a carrier film is used in a cutting device using a longitudinal cutting method with a knife roller and an anvil roller, and the cutting blades of the knife roller are set to a specific blade angle, then even if the distance between the cutting blades of the knife roller is less than 0.5 mm, especially less than 0.5 mm, a laminated film having an adhesive layer laminated on a base film in a releasable manner can be cut in a manner that the base film and the adhesive layer are not peeled off, and exposure of the adhesive layer from the cut tape can be suppressed, thereby completing the present invention.

That is, the present invention provides a cutting device, which has a knife roller and an anvil roller with a plurality of disc-shaped cutting knives arranged at a predetermined interval, and cuts the film in a longitudinal cutting manner, and the cutting device has a carrier film conveying mechanism that places the carrier film between the film to be cut and the anvil roller; the knife angle of the cutting knife is less than 30°, and the spacing between the cutting knives is less than 0.5 mm.

Furthermore, the present invention provides a cutting method, which is a longitudinal cutting method as follows: between a knife roller and an anvil roller provided with a plurality of disc-shaped cutting knives at a predetermined interval, a laminated film having an adhesive layer laminated on a substrate film in a releasable manner and a carrier film are made to overlap and pass through in a manner such that the laminated film is located on the side of the knife roller, and the laminated film is cut; and the knife angle of the cutting knife is set to be less than 30°, and the spacing of the cutting knives is set to be less than 0.5 mm.

Furthermore, the present invention provides a laminated tape, which is obtained by cutting a laminated film in which an adhesive layer is releasably laminated on a base film using the above-mentioned cutting method. Also, a laminated tape is provided, which is a laminated tape in which an adhesive layer is releasably laminated on a base film, and the tape width is less than 0.5 mm. When one end of the laminated tape with a length of 1 m is fixed and a tension of 1 N is applied to the other end, the base film and the adhesive layer are not peeled off. [Effect of the invention]

If a laminated film in which an adhesive layer is releasably laminated on a base film is cut using the cutting device of the present invention and the cutting method of the present invention, a laminated tape having a width of less than 0.5 mm, especially a width of less than 0.5 mm, can be obtained without the base film and the adhesive layer being peeled off. Even if a tape having a length of 1 m is cut from the laminated tape at random, one end of the tape is fixed and a tension of 0.5 N, preferably 1 N, and more preferably 5 N is applied to the other end, the base film and the adhesive layer will not be peeled off. Therefore, even if the laminated tape is wound around a roll to form a roll body, and then pulled out from the roll body for use, the base film and the adhesive layer will not be separated due to the tension during winding or pulling out. Furthermore, the adhesive layer is not exposed in the roll body of the laminated tape. Therefore, blocking can be prevented when the roll body is formed. Therefore, the laminated tape is useful as a narrow adhesive material for attaching the adhesive layer to an article, and is also useful as a bonding material if the adhesive layer is formed from a curable resin composition.

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

<Overall structure of the cutting device> Figure 1 is a schematic oblique view of a cutting device 1 of an embodiment of the present invention, and Figure 2 is a side view of the vicinity of the arrangement area of the cutting blades when the film 3 is cut by the cutting device 1.

As shown in FIG2 , the cutting device 1 is a device that has a knife roller 10 and a cylindrical anvil roller 20, and cuts the film 3 using a longitudinal cutting method. The knife roller 10 has a disc-shaped cutting knife 11 arranged at a predetermined interval on a cylindrical roller 12 in an area 13 in the direction of the rotation axis L1 of the roller 12. In the shearing method, the upper knife and the lower knife are in contact. In contrast, according to the longitudinal cutting method, since the knives do not contact each other, the life of the knives 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 film 3 to be slit between the knife roller 10 and the anvil roller 20. The winding device may include a winding device for winding the tape 3a of the even-numbered rows and a winding device for winding the tape 3b of the odd-numbered rows, so that the adjacent tapes of the tapes of the plurality of rows obtained by slitting the film are wound in different directions. Furthermore, in FIG. 1 , it is described that the tapes 3a of the even-numbered rows are wound up at the top and the tapes 3b of the odd-numbered rows are wound up at the bottom, but the tapes of the even-numbered rows may be wound up at the bottom and the tapes of the odd-numbered rows may be wound up at the top.

The cutting device 1 is provided with a carrier film unwinding device 5 as a carrier film conveying mechanism for placing the carrier film 4 between the film 3 to be cut and the anvil roller 20, a pair of laminate rolls 6 for overlapping the carrier film 4 and the film 3, and a carrier film taking-up section (not shown) for taking up the end portion (edge of the film) of the cut film together with the carrier film 4.

In the cutting device 1, as described below, the film 3 to be cut is not only a single-layer resin film or a laminated film formed by bonding or welding a plurality of resin layers, but even a laminated film 30 ( FIG. 4 ) in which an adhesive layer 32 is releasably laminated on a base film 31 can be cut to a width of less than 0.5 mm, especially a width of less than 0.5 mm.

<Cutting knife> The cutting knife 11 provided on the knife roller 10 is preferably a double-edged blade in terms of stabilizing the cutting direction. If the cutting knife is a single-edged blade (i.e., if one of the two blade surfaces forming the blade tip is a flat surface and the other is a blade edge surface), the force applied to the cutting knife in the film width direction during cutting is greater on the blade edge surface than on the flat surface, and the film is conveyed while bending in the direction of the blade edge. Therefore, the width direction boundary of the film to be cut must be enlarged, and the amount of waste at the end of the film also increases. In contrast, by using a double-edged blade, the force applied to the cutting knife in the film width direction during cutting is equal on both sides of the knife, thereby preventing the film from bending in the conveying direction and reducing the amount of waste at the end of the film.

From the perspective of "being able to cut a laminated film having an adhesive layer releasably disposed on a substrate film into a narrow width of 0.5 mm or less, especially less than 0.5 mm without the substrate film and the adhesive layer being peeled off", the blade angle α of the cutting blade 11 is preferably set to 30° or less, especially 25° or less. On the other hand, from the perspective of the durability of the cutting blade, the blade angle α is preferably set to 10° or more.

The spacing p of the cutting blades 11 is determined by the required width of the tape obtained by cutting the film 3. However, in the present invention, in order to cope with narrow tapes, the upper limit is set to 0.5 mm or less, especially less than 0.5 mm, and further can be set to 0.4 mm or less. The lower limit is preferably set to 0.1 mm or more.

From the perspective of stabilizing the cutting accuracy, the higher the blade height h of the cutting blade 11, the better. The lower limit is preferably 0.05 mm or more, more preferably 0.1 mm or more, and further preferably 0.24 mm or more. On the other hand, from the perspective of the durability of the cutting blade, the lower the blade height h of the cutting blade is, the better. The upper limit is preferably 0.8 mm or less, more preferably 0.7 mm or less, and further preferably 0.5 mm or less.

If the blade angle α of the cutting knife is set to 70° as described in Patent Document 3, then when the spacing is set to less than 0.5 mm, if a laminated film having an adhesive layer laminated on a base film in a removable manner is cut, as shown in FIG6 , even if the laminated film 30 is a laminated film 31 in which an adhesive layer 32 and a cover film 33 are sequentially provided on a base film 31, and the adhesive layer 32 is not exposed on the film surface, the surface of the intrusion side of the cutting knife 11 in the laminated film 30 will be subjected to a stronger compressive force F in the cutting width direction than the surface on the opposite side. Therefore, in the tape after being cut, there arises a problem that the base film 31 or the cover film 33 is peeled off from the adhesive layer 32, or the adhesive layer 32 is exposed from the side surface of the tape, and sticking occurs when the tape is made into a roll body. In contrast, in the present invention, since the blade angle of the cutting knife 11 is reduced to less than 30°, even if the spacing of the cutting knife 11 is set to less than 0.5 mm, especially between 0.1 mm and 0.4 mm, the compressive force F applied to the intruding side surface of the cutting knife 11 as shown in FIG. 4 can be reduced, and the laminated film 30 having the adhesive layer 32 releasably laminated on the base film 31 can be cut without the base film 31 and the adhesive layer 32 being peeled off, and the exposure of the side surface of the adhesive layer 32 can be suppressed. In a narrow tape, the force applied to the average tape cross-sectional area in the cutting width direction is relatively larger than that in a wide tape, so the adhesive layer is more likely to be exposed. Therefore, it can be said that the difficulty of suppressing the exposure of the adhesive layer 32 increases as the tape width becomes narrower.

As the knife roller 10 having the area 13 where the cutting knives 11 are arranged at the above-mentioned knife angle α and spacing p, a cutting knife obtained by cutting a metal roller as shown in FIG2 or a knife set formed by overlapping round knives with a knife angle α in the direction of the rotation axis can be used. Among them, the cutting knife shown in FIG2 can be obtained by providing a free-cutting alloy layer on the surface of a high-strength and durable roller 12 such as carbon steel, and cutting the free-cutting alloy layer using a precision cutting processing device using a diamond tool. In addition, the knife set can be obtained by forming each cutting knife 11 by cutting and combining the cutting knives at a predetermined spacing. The structure of the cutting knife is to set the blade angle to be less than 30° and the spacing to be less than 0.5 mm, preferably less than 0.5 mm, and more preferably less than 0.4 mm. There is no particular limitation as long as the effect of the present invention can be obtained.

As the free-cutting alloy (i.e., alloy with good machinability) for forming the cutter, nickel-phosphorus alloy, hard copper alloy, tool steel, superhard alloy, etc. can be used. From the aspect of durability of the free-cutting alloy, the Vickers hardness is preferably 475 or more, more preferably 500 or more, further preferably 550 or more, and particularly preferably 1400 or more.

<Assembly of knife roller and anvil roller> In the cutting device 1, the knife roller 10 and the anvil roller 20 are supported by bearings 15 and 25, respectively, as shown in FIG3A, and are arranged in a manner that the rotation axes L1 and L2 are parallel. As long as the rotation axes L1 and L2 are parallel, the directions of the rotation axes L1 and L2 can be either horizontal or vertical. From the perspective of stabilizing the movement of the laminated film 30, it is preferred to make the directions of the rotation axes L1 and L2 horizontal and arrange the knife roller 10 on the anvil roller 20. On the other hand, from the perspective of preventing foreign matter from being easily attached to the laminated film 30, it is preferred to make the directions of the rotation axes L1 and L2 vertical.

The knife roll 10 and the anvil roll 20 are connected by gears 16 and 26, and a driving mechanism for rotating them in the direction of the arrows in Fig. 1 is provided. On the other hand, a driving mechanism for rotating and driving the knife roll 10 and the anvil roll 20 separately can also be provided.

In terms of continuous and stable cutting, the cutting amount d2 (FIG. 2) of the cutting knife 11 into the carrier film 4 is preferably 10 to 100 μm, more preferably 10 to 50 μm, and further preferably 10 to 20 μm. It is preferred that the cutting device 1 is provided with an adjustment mechanism for moving the mounting position of the knife roller 10 relative to the anvil roller 20 so that the cutting 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 can be provided for moving the knife roller 10 along the guide 17 by adjusting the screw 18.

On the other hand, when a carrier film with a fixed film thickness is used, as shown in FIG3B , a large diameter portion 14 that protrudes further toward the anvil roller 20 than the tip of the cutting knife 11 can be provided on the knife roller 10, and the large diameter portion 14 is pressed against the anvil roller 20. The thrust for pressing the large diameter portion 14 against the anvil roller 20 can be set to about 800 N. If the thrust is too large, the knife roller 10 will be buckled. In addition, as shown in FIG3C , tool steel, superhard alloy, etc. can be cut into a circular shape, cut, ground, and finished into a circular knife with a thickness of less than 0.5 mm, and the circular knives can be assembled and fixed with bolts 19 to form a knife assembly, and the arrangement area 13 of the cutting knives is formed by the knife assembly. The state shown in FIG. 3C is also the same as the state shown in FIG. 3A . Since the mounting positions of the anvil roller 20 and the knife roller 10 are adjusted by the adjusting screw 18 , there is no need to apply a thrust force to press the knife roller 10 against the anvil roller 20 .

<Cutting method> The cutting method of the present invention is as follows: a laminated film 30 having an adhesive layer 32 laminated on a substrate film 31 in a removable manner is passed between the knife roller 10 and the anvil roller 20 to cut the laminated film 30, and the laminated film 30 is arranged on the knife roller 10 side and the carrier film 4 is arranged on the anvil roller 20 side, so that the laminated film 30 and the carrier film 4 are overlapped and passed, and the laminated film 30 is cut by longitudinal cutting (Figure 1, Figure 4). As described below, when the laminate film 30 is composed of a base film 31, an adhesive layer 32, and a cover film 33, the base film 31 of the laminate film 30 is usually set to the side with the knife roller 10, and the cover film 33 is set to the side of the carrier film 4 as shown in FIG. 4. In this case, the cover film 33 and the carrier film 4 are connected and cut, and after cutting, the cover film 33 and the carrier film 4 are peeled off from the adhesive layer 32. On the other hand, the cover film 33 of the laminate film 30 can also be set to the side with the knife roller 10 and the base film 31 is set to the side of the carrier film 4 for cutting.

The carrier film 4 is cut in half by the cutting, but the laminate film 30 is cut through at a predetermined interval, so the tapes 3a of the even-numbered rows and the tapes 3b of the odd-numbered rows are respectively rolled up by a rolling device in such a manner that adjacent tapes of the plurality of rows of tapes obtained by the through-cutting of the laminate film 30 are rolled up in different directions.

Furthermore, the end portion (edge of the laminate film) 3c of the cut laminate film 30 is rolled up together with the half-cut carrier film 4. Furthermore, the cover film 33 and the carrier film 4 may also be rolled up together.

As mentioned above, the cutting amount d2 of the cutting knife 11 into the carrier film 4 is preferably 10 μm or more and 100 μm or less. In addition, the total thickness of the cut object (laminated film 30 and carrier film 4) is preferably 90% or less relative to the knife height h. For example, when the knife height is 300 μm, the total thickness of the cut object is preferably 270 μm or less (Figure 2). More preferably, the total thickness of the cut object is 70% or less relative to the knife height h, and further preferably 50% or less.

Furthermore, the cutting is preferably performed in a clean room, and there is no need to set a cover covering the entire cutting device in order to suppress changes in ambient temperature, but it can be set.

<Laminated film> As a laminated film 30 cut by the cutting method of the present invention, for example, as shown in FIG. 4, a base film 31, an adhesive layer 32, and a cover film 33 are sequentially laminated in a releasable manner, the base film 31 has a thickness of 12 to 75 μm, especially 25 to 75 μm, the adhesive layer 32 has a thickness of 5 to 40 μm, especially 5 to 25 μm, and the cover film 33 is thinner than the base film or has a thickness of 10 to 50 μm. Here, the term "peelable" means that the base film 31 or the cover film 33 can be peeled off by sticking a cellophane tape on the base film 31 or the cover film 33, or the base film 31 or the cover film 33 can be easily peeled off from the self-adhesive layer 32 by pinching and peeling the end of the base film 31 or the cover film 33 with film tweezers (hereinafter referred to as tweezers).

As shown in FIG. 4 , during cutting, the base film 31 may be disposed on the intrusion side of the cutting blade 11 , and the cover film 33 may be disposed on the intrusion side of the cutting blade 11 .

Furthermore, depending on the use of the laminated tape obtained by cutting the laminated film, the cover film 33 may not be provided on the laminated film 30. If the carrier film 4 is superimposed on the laminated film 30, the rigidity of the entire film becomes higher, so even without the cover film 33, the adhesive layer 32 can be attached to the cutting blade 11 immediately after cutting to prevent the adhesive layer 32 from being peeled off from the base film 31. On the other hand, from the perspective of preventing contamination of the laminated tape, it is preferable to have the cover film 33, especially when a laminated tape of a narrow width is obtained. As for the final form of the wound body used as the bonding material, the covering film 33 may be present to prevent contamination of the covering film, or the covering film 33 may be absent to improve workability.

(Base film, covering film) Base film 31 may be formed of thermoplastic resins such as polyethylene, polypropylene, PET and other polyesters. Covering film 33 is provided to prevent contamination of adhesive layer 32 and may be formed of the same material as base film 31. It is preferred that the surface of base film 31 or covering film 33 is subjected to a peeling treatment. The purpose is to be able to separate from the adhesive layer. In order to peel off the covering film first after cutting, it is preferred to use a base film 31 that is easier to peel off than covering film 33.

In the present invention, the adhesive layer 32 with relatively low rigidity and the base film 31 with relatively high rigidity are cut at the same time, and they are not separated during cutting, so that the adhesive layer 32 and the base film 31 can be peeled off when the laminated tape is used after cutting. Here, since the tensile elastic modulus of polyesters such as polyethylene, polypropylene, and PET is approximately 1100 to 4200 MPa, it is a relatively difficult technology to simultaneously cut the film formed by such thermoplastic resin and the adhesive layer 32 with different rigidity from the film into a narrow width of less than 0.5 mm, and to suppress the separation or peeling of the film and the adhesive layer during cutting, but according to the present invention, such cutting can be performed.

(Adhesive layer) The adhesive layer 32 may be a laminated adhesive film or a laminated adhesive coating. Depending on the use of the tape obtained by cutting the laminated film 30, the adhesive layer 32 may be composed of a single resin layer or a laminate or multilayer of multiple resin layers. Furthermore, the adhesive layer 32 may contain fillers as needed.

(Filler of adhesive layer) When the adhesive layer contains a filler, the filler is appropriately selected according to the use of the tape obtained by cutting the laminated film 30, from known inorganic fillers (metal, metal oxide, metal nitride, etc.), organic fillers (resins, rubbers, etc.), fillers mixed with organic materials and inorganic materials, etc. For example, in optical applications or matte applications, silicon oxide fillers, titanium oxide fillers, styrene fillers, acrylic fillers, melamine fillers, or various titanium salts, etc. can be used. In the use of capacitor films, titanium oxide, magnesium titanate, zinc titanate, bismuth titanate, titanium oxide, calcium titanate, strontium titanate, barium titanate, barium zirconate titanate, lead zirconate titanate, and mixtures thereof can be used. In the use as an adhesive, it can contain polymer rubber particles, polysilicone rubber particles, etc. In the use of electronic parts installation, the filler can have both conductivity and insulation. In the case where the filler has insulation, for example, the filler can be used as a spacer.

The particle size of the filler can be determined according to the purpose of the tape obtained by cutting the laminated film 30. For example, when the tape is used for mounting electronic components, the particle size of the filler is preferably 1 µm or more, and more preferably 2.5 µm or more and 30 µm or less. Here, the particle size refers to the average particle size. The average particle size can be obtained based on the planar image or cross-sectional image of the adhesive layer 32 of the laminated film 30. In addition, the average particle size of the filler as the raw material particles before the adhesive layer 32 of the laminated film 30 contains the filler can be obtained using the wet flow particle size and shape analysis device FPIA-3000 (Malvern Instruments Ltd). The number N is 1000 or more, preferably 2000 or more, and more preferably 5000 or more. On the other hand, fillers with a particle size of less than 1 μm may also be included. Fillers with a particle size of less than 1 μm (so-called nanofillers) include fillers for viscosity adjustment, etc. The size can be determined by observation with an electron microscope (TEM, SEM). The number N is preferably 200 or more.

As fillers, functional ones such as quantum dots may also be included. The size of such fillers is not particularly limited, but is preferably 2 nm or more, more preferably 10 nm or more. The size can also be obtained by observation with an electron microscope (TEM, SEM). The number N is preferably 200 or more.

In the present invention, fillers described below refer to fillers with a particle size of 1 µm or more unless otherwise specified, excluding nanofillers used as surface modifiers or fillers.

In the adhesive layer, the fillers may be mixed in the resin and dispersed irregularly, or may not touch each other when viewed from above, or may be arranged regularly with a predetermined arrangement repeated when viewed from above. The number density of the fillers is appropriately adjusted within a range that does not affect the cutting of the film, and may be set to, for example, 30 to 100,000/ ^mm2 in the plane view. The number density is preferably measured by observing the fillers in the adhesive layer using an optical microscope or a metal microscope in a top view, setting the total area of more than 10 places to more than 2 ^mm2 , and measuring the total number of fillers to more than 200.

(Resin composition forming the adhesive layer) On the other hand, the resin composition forming the adhesive layer 32 can be formed of a thermoplastic resin composition, a high-viscosity adhesive resin composition, or a curable resin composition, etc., by appropriately selecting a material showing adhesiveness or bonding according to the purpose of the tape obtained by cutting the laminate film 30, the presence or absence of fillers, etc. For example, when the tape is used as a bonding material for mounting electronic parts, the resin composition forming the adhesive layer can be set to a curable resin composition containing a polymerizable compound and a polymerization initiator, similar to the resin composition forming the insulating resin layer described in WO2018/074318A1. It can also be a so-called hot melt adhesive material that does not contain a hardening resin composition.

As the polymerization initiator of the curable resin composition, a thermal polymerization initiator or a photopolymerization initiator may be used, or both of them may be used. For example, a thermal cationic polymerization initiator may be used as the thermal polymerization initiator, an epoxy resin may be used as the thermal polymerizable compound, a photoradical polymerization initiator may be used as the photopolymerizable compound, and an acrylate compound may be used as the photopolymerizable compound. As the thermal polymerization initiator, a thermal anionic polymerization initiator may also be used. As the thermal anionic polymerization initiator, it is preferred to use a microcapsule type latent curing agent in which an imidazole modifier is used as the core and its surface is coated with polyurethane.

The minimum melt viscosity of the adhesive layer formed by such an insulating resin composition as a whole is not particularly limited, but can be set to 100 Pa·s or more from the perspective of film formation, and preferably 1500 Pa·s or more to suppress the useless flow of the filler when the adhesive layer 32 is hot-pressed to the article. On the other hand, there is no particular restriction on the upper limit of the minimum melt viscosity, but as an example, it is preferably 15000 Pa·s or less, and more preferably 10000 Pa·s or less. The minimum melt viscosity can be obtained, for example, by using a rotational rheometer (manufactured by TA Instruments) with a measuring pressure of 5 g fixedly maintained and a measuring plate of 8 mm in diameter. More specifically, it can be obtained in a temperature range of 30 to 200°C by setting a heating rate of 10°C/min, a measuring frequency of 10 Hz, and a load change of 5 g relative to the above-mentioned measuring plate. Furthermore, the minimum melt viscosity can be adjusted by changing the type or blending amount of the micro-solid contained as the melt viscosity modifier, the adjustment conditions of the resin composition, etc.

(Adhesion of adhesive layer) ·Releasability The adhesion of the adhesive layer 32 to the base film 31 and the cover film 33 is weaker than the adhesion of the adhesive layer 32 when the adhesive layer 32 is attached to a predetermined article for each purpose of the tape, and the base film 31 and the cover film 33 can be peeled off from the adhesive layer 32. Usually, after peeling off the cover film 33, the adhesive layer 32 is attached to an article to evaluate the releasability of the base film 31. The so-called base film 31 and cover film 33 can be peeled off from the self-adhesive layer 32, as mentioned above, means that the self-adhesive layer 32 can be easily peeled off by sticking cellophane tape to the base film 31 or the cover film 33 and peeling it off, or by pinching the end of the base film 31 or the cover film 33 with tweezers and peeling it off. As a specific indicator, when the laminate film before cutting is cut into a width of 5 cm and a length of 15 cm and a T-type peeling test (JIS K 6854) is performed as a peeling test, the strength is 0.005 to 0.2 N. The evaluation can also be performed by a 180° peel test or a 90° peel test according to the material or thickness of the substrate film 31. Generally, the cover film 33 is first peeled off from the substrate film 31 and the adhesive layer 32 using a cellophane tape, and after the adhesive layer 32 is attached to the article, the substrate film 31 is peeled off using tweezers.

· Stability On the other hand, when the laminate film 30 is cut into strips and the strips are wound onto a reel by a winding device to form a roll body, or when the roll body is used as a bonding material and the roll body is mounted on a connecting device to pull out the strip from the roll body, tension is applied to the strip in the length direction of the strip. Therefore, when such tension is applied to the strip, it is preferred that the base film 31 and the adhesive layer 32 do not peel off. That is, in the past, the strip length required for the roll body in the connecting device was usually more than 5 m, preferably more than 10 m, and the tension applied in the length direction of the strip when the strip was pulled out from the roll body was generally about 1 N to 5 N. Furthermore, when a problem occurs during the operation of the connection device, the reel may get stuck and a tension of 5 to 6 N may be applied to the tape. Therefore, it is necessary to assume that a load of about 5 N is applied to the tape. Therefore, it is preferable to maintain the bonding state between the base film and the adhesive layer or the connection between the reel and the base film (the connection between the lead pulled out from the reel and the base film using a bonding film such as a silicon ribbon or ultrasonic welding) under the tension.

However, when the tape is made narrow, if the previous tension is applied to the tape, there is a concern that the base film may break or the base film may be separated from the adhesive layer. Therefore, when the existing equipment is used as effectively as possible to roll or pull out the narrow tape, the tension applied in the longitudinal direction of the tape only needs to be about 0.5 N, preferably less than 1 N. As for the upper limit, it is more preferably 0.7 N or less, and further preferably 0.3 N or less.

In order to be able to roll or pull out in this way, the adhesive layer 32 is required to have stability, that is, when a tension of 0.5 N or more, preferably 1 N, and more preferably 5 N is applied in the longitudinal direction to a laminated tape having a width of 0.1 mm or more and 0.5 mm or less and a length of 1 m or more, preferably 5 m or more, cut by the method of the present invention, the base film 31 and the cover film 33 will not be peeled off from the adhesive layer 32. In addition, the above-mentioned peelability is a property related to the upper limit of the adhesive force of the adhesive layer 32 relative to the base film 31 and the cover film 33, and the stability is a property related to the lower limit of the adhesive force.

The stability test is preferably simple to perform. Therefore, as a test method, the following test can be listed: the test length of the laminated tape is set to 1 m, one end of the laminated tape cut to a length of 1 m is fixed, and a load of 0.5 N, preferably 1 N, and more preferably 5 N is applied to the other end to observe whether the base film 31 and the adhesive layer 32 are peeled off. In addition, as a more practical test method, the following test can be listed: the tape is pulled out from the roll body for more than 1 m, and a load of 0.3 N, 0.5 N, 1 N, or 5 N is applied to its end to observe whether it is peeled off. Alternatively, the entire length of the tape may be pulled out from the roll body, and the presence or absence of peeling may be observed at any 20 or more locations, preferably at least 50 locations. In this test, as an example of an indicator of the adhesive force required for practical use, the following may be cited: (i) a laminate film is cut into laminate tapes having a width of 0.1 mm to 0.5 mm using the method of the present invention, the covering film is peeled off to form a roll body of the tape of the adhesive layer and the base film, the tape is pulled out from the roll body to a length of 1 m, and the connection position between the core of the roll and the tape is fixed, and a static load is applied to the end of the tape to increase the load to 0.3 N, preferably 0.5 N, more preferably 1 N, and further preferably 5 N. (i) when a tensile force of 0.5 N is applied at a connection position angle α (Japanese Patent Publication No. 2017-137188) of 90°, the base film does not peel off from the adhesive layer, and no exposure that affects the pull-out is produced; (ii) a test piece of 1 m in test length is randomly cut from a laminated film cut into a laminated tape with a width of 0.1 mm or more and 0.5 mm or less by the method of the present invention, and in the test piece, when a tensile force of 0.5 N, preferably 1 N, and more preferably 5 N is applied in the length direction of the test piece, the base film 31 does not peel off from the adhesive layer 32; (iii) the adhesive layer and the base film tape are wound around a core for 5 minutes at a tension of 0.5 N. m or more to form a roll body, and when the tape is pulled out from the roll body by hand, no peeling of the adhesive layer and the base film is visually confirmed over the entire length of the tape (details are described in the following examples). From the perspective of ease of testing, method (iii) is preferred. It is also possible to cut the tape into a test length of about 1 m and apply a load (approximately 1 N to 5 N) to both ends by hand to confirm that no peeling of the base film and the adhesive layer occurs.

If the laminated tape has the above-mentioned adhesion, when the laminated tape is wound into a roll-up body preferably having a length of more than 5 m, more than 10 m, more than 50 m, or further more than 100 m, and the tape is pulled out from the roll-up body preferably to a length of more than 1 m, more preferably to a length of more than 5 m, the base film 31 will not be peeled off from the adhesive layer 32 in the pulled-out tape, so that the tape can be provided for the installation of electronic components.

· Adhesion to the object to be connected On the other hand, from the perspective of adhesion to the object to be connected such as electronic parts and substrates, the following method can be listed as a test method for the adhesion required of the adhesive layer: a small piece of 2 cm in length randomly taken from the laminated tape (or a small piece cut from the 1 m laminated tape test piece in (ii) above) is temporarily attached from the adhesive layer side to the blank glass (blank glass). glass) (for example, attached at 45°C), a peeling test is performed by pinching only the end of the base film 31 (or the cover film 33) with a tweezer to remove it, and the state of "only the base film 31 (or the cover film 33) can be removed in the peeling test, and the adhesive layer can be attached to the blank glass without changing its shape" is regarded as successful. In the peeling test, preferably, the number N is 20 or more and the success rate is 75% or more, more preferably, the success rate is 80% or more, and even more preferably, the success rate is 90% or more.

(Attachment of connecting tape) In order to attach the lead wire at the beginning of winding or unwinding of the package body to the laminate film 30, or to attach the first laminate film to the second laminate film and lengthen it, a connecting tape may be attached to the laminate film 30. The connection parts may be set regularly or irregularly at multiple locations. In addition, in attaching the laminate film to the lead wire, the base film 31 of the laminate film 30 and the lead wire may be connected by a connecting tape. The laminate film may be attached to the lead wire by a known method such as ultrasonic welding.

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

When the portion of the laminate film 30 to which the connecting tape is attached is cut, as shown in FIG5 , the cutting blade 11 penetrates deeper into the laminate body of the laminate film 30 and the connecting tape 35. Therefore, according to the conventional cutting device, the interval between adjacent blades becomes significantly narrower on the surface of the laminate body on the side where the cutting blade 11 penetrates, and a stronger compressive force F is applied from the side of the cutting blade 11 relative to the surface on the opposite side, so that the covering film 33 or the base film 31 is peeled off from the adhesive layer 32, or the adhesive layer 32 is easily exposed from the side of the laminate body to be cut. In contrast, according to the present invention, even when the laminate film 30 is bonded with the connecting tape 35, such peeling or exposure can be suppressed.

<Laminated tape> The laminated tape of the present invention is a tape obtained by cutting the laminated film 30 using the above-mentioned cutting method. Therefore, the tape is a laminated tape in which an adhesive layer is releasably laminated on a base film, and the upper limit of the tape width is 0.5 mm or less, especially less than 0.5 mm, preferably 0.4 mm or less, and further preferably 0.3 mm or less. The lower limit is 0.1 mm or more, preferably 0.15 mm or more, and more preferably 0.2 mm or more.

The laminated tape has the following characteristics: when one end of a test piece cut from the tape is fixed in a manner of a test length of 1 m, and a tension of 0.3 N, 0.5 N or 1 N is applied to the other end, the base film and the adhesive layer are not separated, and the adhesive layer 32 is not exposed in the roll body. In addition, when the laminated tape is cut into small pieces of 2 cm in length and the adhesive layer 32 is attached to the blank glass, and removed by pinching only the end of the base film 31 with tweezers, the practical requirement that the adhesive layer is not easily separated from the blank glass is met, and the so-called bonding or transfer can be realized.

From the perspective of operability, it is preferred to make a package in which the tape is wound around a reel. From the perspective of practicality, the tape length in the package is preferably 5 m to 5000 m, more preferably 50 m to 1000 m, and further preferably 500 m to 500 m. Generally speaking, if the tape width is narrow, it is easy to cause adhesion in the package, but according to the laminated tape of the present invention, the package is not easy to cause adhesion, and even if the tape is pulled out of the package for more than 5 m, the pulled out tape will not be separated between the base film 31 or the cover film 33 and the adhesive layer 32.

Furthermore, generally speaking, there is a situation where the ends of the laminated tape obtained by cutting the laminated film are visually bulged (discolored portions). If the tape width is a narrow width of 0.5 mm or less, the bulges at both ends of the laminated tape may cause unnecessary peeling of the base film and the adhesive layer. However, according to the present invention, since the laminated film is cut by two sharp knives, even if the presence or absence of bulges is checked by visual observation at any 20 or more locations, preferably at least 50 locations, in the entire length of the tape forming the roll body, it is difficult to observe the bulges. Even when a bulge is observed along the end of the cut of the laminated tape, the bulge length does not reach 5 cm, and the width is less than 40% of the tape width, especially less than 1/3, which can suppress the peeling of the base film and the adhesive layer.

Thus, according to the laminated tape of the present invention, since the base film and the adhesive layer are not easily offset, and it is not easy to produce adhesion or bulge, the workability of rolling and pulling out the roll body is good, and when the tape pulled out and cut from the roll body is attached to the target component, the attachment position is not easy to be offset. Therefore, the laminated tape of the present invention can be used for various purposes as a narrow-width adhesive or bonding material. In this case, the type of resin composition constituting the adhesive layer 32 is appropriately selected according to the target component to which the tape is attached. Example

Example 1 A laminated film was prepared by cutting a substrate film made of a 38 μm thick PET film subjected to peeling treatment, a bonding layer made of a 10 μm thick acrylic thermosetting resin (adhesive film, manufactured by Dexerials), and a covering film made of a 12 μm thick PET film. The cutting blade shown in FIG. 2 was used to cut the film into strips of 0.3 mm in width and 100 m in length. The covering film was then peeled off and the substrate film and the bonding layer were aligned at 100 μm. A 90 mm flanged core (flange spacing 0.4 mm) was rolled up with a tension (winding tension) of 0.3 to 0.6 N applied to it to produce a roll body, which was then evaluated as follows.

(1) Bumping Pull out the entire 100 m tape in a roll by hand, and visually inspect 20 test areas of 10 cm in length at random locations on the pulled tape. Evaluate the following criteria based on the following items a, b, and c regarding the presence or absence of bumping.

a: No bulges longer than 5 cm b: No bulges wider than 1/3 of the band width c: No bulges shorter than 5 cm or bulges less than 1/3 of the band width in 5 or fewer locations Evaluation A: When all conditions abc are met Evaluation B: When conditions ab are met at the same time Evaluation C: Other than the above evaluations A and B

The evaluation result is evaluation A. Furthermore, in practice, there is no problem as long as evaluation B is satisfied, and it is better to satisfy evaluation C.

(2) Peeling In the above test, it was confirmed that no peeling occurred in the 50 places where the bulge was visually observed and 30 other places. In the test, the entire length was pulled out and visually observed, and there was basically no peeling. In addition, there was no exposure of the adhesive layer that would hinder workability, and no adhesion of the adhesive layer to the ridge was confirmed.

Furthermore, the results of (1) and (2) above are not limited to cutting with a cutting knife.

1: Cutting device 2: Film unwinding device 3: Film 4: Supporting film 5: Supporting film unwinding device 6: Laminating roller 10: Roller with knife 11: Cutting knife, circular knife 12: Roller 13: Area 14: Large diameter part 15: Bearing 16: Gear 17: Guide 18: Adjusting screw 19: Bolt 20: Anvil roller 25: Bearing 26: Gear 30: Laminated film 31: Base film 32: Adhesive layer 33: Cover film 35: Connector α: Cutting knife angle d1: Gap between cutting knife tip and anvil roller d2: Cutting knife penetration into carrier film F: Compression force h: Cutting knife height L1, L2: Rotating axis p: Cutting knife spacing

[Figure 1] is a schematic oblique view of the cutting device of the embodiment. [Figure 2] is a side view of the vicinity of the arrangement area of the cutting blade (cutting blade) of the cutting device for cutting a laminated film. [Figure 3A] is a cross-sectional view showing the mounting structure of the knife roller and the anvil roller of the device of the embodiment. [Figure 3B] is a cross-sectional view showing a modified form of the mounting structure of the knife roller and the anvil roller. [Figure 3C] is a cross-sectional view showing a modified form of the mounting structure of the knife roller and the anvil roller. [Figure 4] is an enlarged cross-sectional view of the cutting blade portion when the cutting blade of the device of the embodiment is used to cut the laminated film. [Figure 5] is an enlarged cross-sectional view of the cutting knife portion when cutting a laminated film bonded to each other in the long-side direction using a connecting tape. [Figure 6] is an enlarged cross-sectional view of the cutting knife portion when cutting a laminated film using a cutting knife with a blade angle of 70°.

3: Membrane

4: Carrier film

10: With knife roller

11: Cutting knife, round knife

20: Anvil Roller

30: Laminated film

31: Base film

32: Adhesive layer

33: Covering film

α: The angle of the cutting knife

F: Compression force

p: Distance between cutting knives

Claims (25)

A cutting device is provided with a knife roller and an anvil roller on which a plurality of disc-shaped cutting knives are arranged at a predetermined interval, and the film is cut by a score cut method. A film unwinding device and a film taking-up device are provided as a conveying mechanism for the film to be cut. The cutting device has a carrier film conveying mechanism for placing a carrier film between the film to be cut and the anvil roller. The film to be cut by the score cut method is a laminated film in which an adhesive layer is laminated on a base film in a releasable manner. The knife angle of the cutting knife is less than 30°, and the distance between the cutting knives is less than 0.5 mm. As in claim 1, the cutting device, wherein the cutting knife has a blade angle of more than 10°. For example, the cutting device of claim 1 or 2, wherein the distance between the cutting blades is greater than 0.1 mm and less than 0.4 mm. For example, the cutting device of claim 1 or 2, wherein the cutting blade height is greater than 0.05 mm and less than 0.8 mm. A cutting device as claimed in claim 1 or 2, which has an adjustment mechanism for moving the mounting position of the knife roller relative to the anvil roller. The cutting device of claim 1 or 2, wherein the thickness of the substrate film constituting the laminated film to be cut is 12 to 75 μm, and the thickness of the adhesive layer is 5 to 40 μm. As in claim 1, the cutting device, wherein when the cutting object, i.e. the laminated film, is cut, the base film and the adhesive layer are constructed in a manner that they will not separate. For example, in the cutting device of claim 1, the adhesive layer constituting the laminated film to be cut, when the laminated film before cutting is cut into a width of 5 cm and a length of 15 cm, and a T-type peeling test (JIS K 6854) is performed as a peeling test, the strength then shows an adhesive force of 0.005~0.2N, and when a tension of 1N is applied in the longitudinal direction to the laminated film cut into a width of more than 0.1mm and less than 0.5mm and a length of 1m, it shows an adhesive force that does not peel off from the base film. A cutting method is a longitudinal cutting method as follows: between a knife roller and an anvil roller provided with a plurality of disc-shaped cutting knives at a predetermined interval, a laminated film having an adhesive layer laminated on a substrate film in a releasable manner and a carrier film are overlapped and passed in a manner such that the laminated film is located on the side of the knife roller, and the laminated film is cut; and the laminated film is transported by a film unwinding device and a winding device, and the knife angle of the cutting knife is set to less than 30°, and the distance between the cutting knives is set to less than 0.5 mm. As in claim 9, the cutting method, wherein the laminated film is cut into laminated strips with a length of more than 5 m. In the cutting method of claim 9 or 10, the cutting knife angle is set to be greater than 10°. As in the cutting method of claim 9 or 10, the distance between the cutting blades is set to be greater than 0.1 mm and less than 0.4 mm. The cutting method of claim 9 or 10, wherein the laminated film is formed by laminating the covering film on the adhesive layer in a releasable manner. The cutting method of claim 9 or 10, wherein a connecting tape is attached to the laminate film. In the cutting method of claim 9 or 10, the thickness of the substrate film constituting the laminated film to be cut is 12 to 75 μm, and the thickness of the adhesive layer is 5 to 40 μm. As in claim 9, the cutting method, wherein when the cutting object, i.e., the laminated film, is cut, the base film and the adhesive layer are constructed in a manner that will not separate. For example, in the cutting method of claim 9, the adhesive layer constituting the laminated film to be cut, when the laminated film before cutting is cut into a width of 5 cm and a length of 15 cm, and a T-type peeling test (JIS K 6854) is performed as a peeling test, the strength then shows an adhesive force of 0.005~0.2N, and when a tension of 1N is applied in the longitudinal direction to the laminated film cut into a width of 0.1mm to 0.5mm and a length of 1m, it shows an adhesive force that does not peel off from the base film. A laminated tape obtained by cutting a laminated film in which an adhesive layer is releasably laminated on a substrate film using a cutting method according to any one of claims 9 to 14. For example, the laminated tape in claim 18 is obtained by cutting the laminated film into pieces with a length of more than 5m. A laminated tape manufactured by a cutting device according to any one of claims 1 to 8, wherein an adhesive layer is laminated on a base film in a removable manner, and the tape width is less than 0.5 mm. When one end of a 1 m long laminated tape cut arbitrarily from the laminated tape is fixed and a tension of 1 N is applied to the other end, the base film and the adhesive layer are not peeled off. For example, the length of the layered belt in claim 20 is more than 5m. For the laminated tape in claim 20 or 21, the tape width is between 0.1mm and 0.4mm. A laminated tape as claimed in claim 20 or 21, wherein the cover film is laminated on the adhesive layer in a releasable manner. For the laminated tape of claim 20 or 21, it is attached with a connecting tape. The laminated tape of any one of claims 18 to 21, wherein the thickness of the substrate film is 12 to 75 μm, and the thickness of the adhesive layer is 5 to 40 μm.