JP6171619B2 - Adhesive tape roll - Google Patents

Description

  The present invention relates to a wound body in which an adhesive tape is wound around a winding core having a predetermined length in the axial direction.

  As an adhesive tape, an anisotropic conductive material tape that bonds and fixes an electronic component and a circuit board, circuit boards and the like, and electrically connects electrodes facing each other is known. By sandwiching such an anisotropic conductive material tape between opposing electrodes and applying heat and pressure, the substrates can be bonded to each other and the electrodes can be made conductive.

  Conventionally, an anisotropic conductive material tape has been provided as a reel product by being wound around a reel, which is a disk-shaped core material, for example. Further, it has been proposed to supply an anisotropic conductive material tape as a product by using a cylindrical body having a predetermined length in the center line direction as a core material and winding an anisotropic conductive material tape around the core material. (For example, refer to Patent Document 1).

JP 2004-59776 A

  When using an adhesive tape, it is necessary to first draw out the adhesive tape from a wound body wound around the core material. When pulling out the adhesive tape from the wound body, the adhesive tape is pulled out from the wound body while rotating the wound body around the axis. Since the adhesive layer is peeled off from the base film when the adhesive tape is bonded to a substrate or the like, the adhesive tape is designed so that the base film is easily peeled off with a relatively weak force. When pulling out the adhesive tape from the wound body, for example, the adhesive layer of the adhesive tape wound around the core material (for example, the anisotropic conductive material layer) is adjacent to the other circumference of the radial direction. If the adhesive film remains attached to the base film, the adhesive layer and the base film of the same circumference are peeled off, and it is difficult to continue drawing the adhesive tape.

  An object of this invention is to provide the wound body of the adhesive tape which can pull out an adhesive tape reliably from the state wound on the core.

The wound body of the adhesive tape of the present invention includes an adhesive tape having a base film and an adhesive layer provided on the base film, and the adhesive tape is wound around a winding core extending in the axial direction. A wound body that is overlaid, wherein the adhesive tape is wound along the circumferential surface of the winding core while shifting the position in the axial direction from one end side to the other end side of the winding core; The adhesive tape is wound along the peripheral surface of the core while being displaced in the axial direction from the other end side of the core to the one end side, adjacent to the outer side in the radial direction with respect to the first circumferential portion. The base film has a breaking strength of 80 MPa or more and 400 MPa or less and a breaking elongation of 30% or more and 200% or less, and the adhesive tape is an electrode as an adhesive layer. Anisotropic conductivity with conductive particles mixed in resin An anisotropic conductive material tape comprising a layer, when viewed from the outside in the radial direction, as characterized by the adhesive tape of the first circumferential portion and the adhesive tape of the second circumferential portion intersect Yes.

  The wound body includes a first circumferential portion in which an adhesive tape is wound a plurality of times along the circumferential surface of the winding core while shifting the position in the axial direction from one end side to the other end side of the winding core. A second winding part around which the adhesive tape is wound a plurality of times along the peripheral surface of the core while shifting the position in the axial direction from the other end side of the core to the one end side on the winding part of The adhesive tape in the first circumferential portion and the adhesive tape in the second circumferential portion adjacent to each other in the radial direction intersect with each other when viewed from the outside in the radial direction. That is, when viewed from the outside in the radial direction, the adhesive tape of the first circumferential portion adjacent to the radial direction and the adhesive tape of the second circumferential portion are prevented from being arranged in parallel. It is prevented that the adhesive tape of the 1st circumference part and the adhesive tape of the 2nd circumference part adhere continuously two or more times. The adhesive tape of the 2nd circumference part is arranged so that it may get over the edge part of the width direction of the adhesive tape of the 1st circumference part. In the portion where the adhesive tape of the second circumferential portion is attached over the widthwise end of the adhesive tape of the first circumferential portion, the adhesive tape of the first circumferential portion and the second circumferential portion The adhesive force with the adhesive tape is weak, and the adhesive tapes arranged on different circumferences in the radial direction are easily separated, and can be reliably pulled out from the wound body.

  Moreover, the structure by which the clearance gap was formed between the adhesive tapes adjacent to an axial direction may be sufficient as a wound body. In the wound body of this configuration, since a gap is formed between the end portions in the width direction of the adjacent adhesive tape, the adhesive tape of the second circumferential portion is the same as the adhesive tape of the first circumferential portion. A region that is disposed across the gap between the end portions and is not in contact with the adhesive tape of the first circulation portion is formed. Therefore, the adhesive layer of the adhesive tape of the second circulation part is prevented from remaining attached to the base film of the adhesive tape of the first circulation part, and the adhesive layer of the same circulation and It is prevented that the base film is separated.

  The adhesive tape may be an anisotropic conductive material tape having an anisotropic conductive material layer as an adhesive layer. Thereby, an anisotropic conductive material tape can be reliably pulled out from a wound body.

  According to the present invention, when pulling out the adhesive tape from the state of being wound around the core, the base film of the adhesive tape and the adhesive layer are prevented from being separated, and the adhesive tape is wound. It can be pulled out of the body.

It is a typical perspective view which shows the winding body of the anisotropic electrically-conductive material tape of one Embodiment of this invention. It is a typical sectional view of an anisotropic conductive material tape. It is a typical side view which shows a winding body, (a) is a typical side view in the state where the 2nd surrounding part is exposed to an outer peripheral surface, (b) is a 1st surrounding part exposed to an outer peripheral surface. It is a typical side view of the state which is carrying out. It is a typical expanded side view which expands and shows the winding body of the state which the 2nd surrounding part has exposed to the outer peripheral surface.

  Hereinafter, preferred embodiments of a wound body of an adhesive tape according to the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, the wound body 1 is obtained by winding an anisotropic conductive material tape (adhesive tape) 3 around a winding core (core material) 2 extending in the direction of the axis L ₀ .

  FIG. 2 is a schematic cross-sectional view of the anisotropic conductive material tape 3. As shown in FIG. 2, the anisotropic conductive material tape 3 includes a base film 4 and an adhesive layer (anisotropic conductive material layer) 5 provided on one surface of the base film 4. Examples of materials that can be used for the base film 4 include polypropylene (PP), stretched polypropylene (OPP), and polyethylene terephthalate (PET). The base film 4 preferably has a breaking strength of 80 to 400 MPa and a breaking elongation of 30 to 200%. The breaking strength and breaking elongation are measured by JIS C2318 or a method according thereto. By using the base film 4 having such breaking strength and breaking elongation, the adhesive layer 5 is prevented from extending together with the base film 4, and the performance stability of the product after joining is further improved. Can do.

  The thickness of the base film 4 is preferably 100 μm or less (preferably 75 μm or less, more preferably 50 μm or less). By making the thickness of the base film 4 within this range, the thickness of the anisotropic conductive material tape 3 can be reduced, and the length of the anisotropic conductive material tape 3 that can be wound around the core 2 is increased. And productivity can be improved. In addition, as a minimum of the thickness of the base film 4, it is about 10 micrometers.

  The width of the base film 4 is preferably the same as the width of the adhesive layer 5 or larger than the width of the adhesive layer 5. Specifically, since the width of the adhesive layer 5 is preferably 0.5 to 5 mm, a width equal to or wider than 50%, that is, a width of about 0.5 to 7.5 mm is preferable. When the width of the base film 4 is wider than the adhesive layer 5, the adhesive layer 5 is preferably arranged at the center in the width direction of the base film 4.

  The base film 4 may have a surface subjected to a release treatment. Here, the “mold release treatment” refers to a treatment that lowers the adhesiveness of the material by lowering the surface of the base film 4. As the mold release treatment, a method of surface treatment with silicone or a fluorine compound is typical. It is preferable that the both surfaces of the base film 4 are subjected to release treatment. By performing the release treatment in this manner, the adhesive layer 5 can be easily peeled from the base film 4 when the adhesive layer 5 is adhered to an electronic substrate or the like.

  The adhesive layer 5 is typically one in which conductive particles for obtaining conduction between electrodes are mixed with a resin, and examples of the resin include a thermoplastic resin, a thermosetting resin, a thermoplastic resin, and a thermosetting resin. A resin mixed system and a photocurable resin can be used (for example, see JP-A-55-104007). The conductive particles may not be included and the resin particles may be used alone (see, for example, JP-A-60-262430).

  As the thermoplastic resin, there are a styrene resin system and a polyester resin system, and as the thermosetting resin system, an epoxy resin system, a silicone resin system, an acrylic resin system, and the like are known. Usually, heating and pressurization are required to connect both the thermoplastic resin system and the thermosetting resin system. This is because the thermoplastic resin system allows the resin to flow to obtain adhesion to the adherend, and the thermosetting resin system further performs a resin curing reaction. In addition, the photo-curing resin system is useful for applications requiring connection at a low temperature.

  There is no restriction | limiting in particular in the thickness of the adhesive bond layer 5, According to the application to apply, it can determine suitably. The thickness of the adhesive layer 5 can be 1-100 micrometers (preferably 5-100 micrometers, Furthermore, 10-40 micrometers), for example.

Core 2, as shown in FIG. 1, the axis L ₀ direction a cylindrical body having a predetermined length. The outer diameter of the core 2 is, for example, 90 mm, and preferably 60 to 120 mm, and the inner diameter of the core 2 is, for example, 76 mm. Axis _{L 0} length of the winding core 2 is, for example, 50 to 150 mm.

The anisotropic conductive material tape 3 is wound along the outer peripheral surface of the core 2, wound in a plurality of rows in a predetermined length in the axis L ₀ direction of the core 2, and then sequentially outward in the radial direction. It is rolled up and wound several times. In the anisotropic conductive material tape 3, the adhesive layer 5 is disposed on the inner side in the radial direction, and the base film 4 is disposed on the outer side in the radial direction. The total length of the anisotropic conductive material tape 3 wound around the core 2 is, for example, 3000 m. Axis _{L 0} width of the wound body 1 in this case is, for example, 20 mm, an outer diameter of the wound body 1 is, for example, 150 mm. Further, the wound body 1 is arranged in a central region of the axis L ₀ direction of the winding core 2.

As shown in FIG. 3, the wound body 1 includes an anisotropic conductive material tape along the circumferential surface of the core 2 while shifting the position in the axis L ₀ direction from the one end 2 a side to the other end 2 b side of the core 2. 3 and the first circumferential portion 6 which is wound along the peripheral surface of the winding core 2 while shifting the position in the axial L ₀ direction to the one end 2a side from the other end 2b of the winding core on the first circumferential portion 6 And a second winding portion 7 around which the anisotropic conductive material tape 3 is wound. The wound body 1 is alternately provided with first winding portions 6 and second winding portions 7 in the radial direction of the core 2. When viewed from the outside in the radial direction, the anisotropic conductive material tape 3 of the first rotating portion 6 and the anisotropic conductive material tape 3 of the second rotating portion 7 are arranged so as to intersect each other.

  FIG. 3A shows a state in which the second circumferential portion 7 is exposed on the outer circumferential surface of the wound body 1. Anisotropic conductive material tape 3 is wound around second winding portion 7 while shifting the position in the direction of arrow b from the other end 2b side of winding core 2 toward one end 2a side. When viewed from the outside in the radial direction of the wound body 1, the anisotropic conductive material tape 3 of the second winding portion 7 is arranged such that the lower 3b side is shifted in the arrow b direction from the upper 3a side. In the second circulating portion 7, adjacent anisotropic conductive material tapes 3 are preferably wound so as not to overlap in the radial direction, but may partially overlap.

  FIG. 3B shows a state in which the first circumferential portion 6 is exposed on the outer circumferential surface of the wound body 1. Anisotropic conductive material tape 3 is wound around first winding portion 6 while shifting the position in the direction of arrow a from one end 2a side of winding core 2 toward the other end 2b side. When viewed from the outside in the radial direction of the wound body 1, the anisotropic conductive material tape 3 of the first winding portion 6 is arranged such that the lower 3 b side is shifted in the arrow a direction from the upper 3 a side. In the 1st circumference part 6, it is preferred that adjacent anisotropic conductive material tapes 3 are wound so that it may not overlap in the diameter direction, but a part may overlap.

  FIG. 4 is a schematic enlarged side view showing the outer peripheral surface of the wound body 1 in an enlarged manner. FIG. 4 shows a state in which the second circulating portion 7 is exposed on the outer peripheral surface. In the wound body 1, when viewed from the outside in the radial direction, a gap d is formed between the end portions 3 c in the width direction of the adjacent anisotropic conductive material tape 3. The wound body 1 may have a configuration in which the gap 3 is not formed and the end portions 3c are in contact with each other.

  The gap d between the end portions 3c of the anisotropic conductive material tape 3 is, for example, 7.5 mm or less, and preferably 0.05 to 0.2 mm. Moreover, the clearance gap d is 100% or less with respect to the width | variety of the anisotropic electrically-conductive material tape 3, for example, and it is preferable that it is 5-20%.

When viewed from the outside in the radial direction of the wound body 1, the anisotropic conductive material tape 3 of the second winding portion 7 is, for example, 2 to 2 with respect to the anisotropic conductive material tape 3 of the first winding portion 6. preferably intersect at 90 degree angle theta _1. Further, when viewed from the outside in the radial direction of the wound body 1, the anisotropic conductive material tape 3 of the first winding part 6 or the second winding part 7 is, for example, 45 to 45 relative to the axis L ₀ of the core 2. It is preferably arranged at an angle θ ₂ of 89 degrees.

  In the wound body 1, the number of turns of the anisotropic conductive material tape 3 in the first winding portion 6 and the number of turns of the anisotropic conductive material tape 3 in the second winding portion 7 may be the same or different.

  Next, the operation of the wound body 1 of the anisotropic conductive material tape 3 will be described.

  When pulling out the anisotropic conductive material tape 3 from such a wound body 1, for example, the winding core 2 is inserted into the rotating shaft (of the feeding device) and the rotating shaft is rotated about the axis, thereby winding the winding core 2. The winding body 1 is rotated and the tip of the anisotropic conductive material tape 3 is pulled to pull out the anisotropic conductive material tape 3 from the winding body 1.

  In the wound body 1, the 1st surrounding part 6 and the 2nd surrounding part 7 are arrange | positioned alternately at radial direction. The wound body 1 is disposed so that the anisotropic conductive material tape 3 of the first winding portion 6 and the anisotropic conductive material tape 3 of the second winding portion 7 intersect when viewed from the outside in the radial direction. Therefore, it is possible to prevent the anisotropic conductive material tape 3 of the second circulation part 7 from being continuously long in the circumferential direction and the anisotropic conductive material tape 3 of the first circulation part 6 disposed radially inward. Is done. That is, since the anisotropic conductive material tape 3 of the second circulation portion 7 is arranged so as to get over the end portion 3c of the anisotropic conductive material tape 3 of the first circulation portion 6, the second circulation continuously in the circumferential direction. It is prevented that the anisotropic conductive material tape 3 of the part 7 and the anisotropic conductive material tape 3 of the first circulation part 6 are kept in contact with each other.

  Moreover, in the wound body 1, since the clearance gap d is formed between the edge parts 3c of the adjacent anisotropic conductive material tape 3, the anisotropic conductive material tape 3 of the 2nd winding part 7 is the 1st winding part. 6 is arranged so as to straddle the gap d between the end portions 3 c of the anisotropic conductive material tape 3. Thereby, in the longitudinal direction of the anisotropic conductive material tape 3, portions that are not in contact with the anisotropic conductive material tape 3 arranged on the radially inner side are formed at predetermined intervals. When pulling out from the wound body 1, the anisotropic conductive material tape 3 is easily peeled from the radially conductive anisotropic tape 3. In the wound body 1, when the anisotropic conductive material tape 3 is pulled out from the wound body 1, the adhesive layer 5 of the anisotropic conductive material tape 3 causes the base film 4 of the anisotropic conductive material tape 3 on the radially inner side. The adhesive layer 5 and the base film 4 of the anisotropic conductive material tape 3 having the same circumference are prevented from being peeled off by being left attached to the substrate. As a result, the anisotropic conductive material tape 3 can be pulled out stably and continuously from the wound body 1.

  Moreover, in the wound body 1, the anisotropic conductive material tape 3 of the 1st surrounding part 6 and the anisotropic conductive material tape 3 of the 2nd surrounding part 7 are arrange | positioned so that it may mutually cross | intersect, Therefore The number of times of overcoming the end portion 3c of the conductive tape 3 can be increased.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  In the said embodiment, although the anisotropic conductive material tape 2 which has anisotropic conductivity is illustrated as an adhesive tape, an adhesive tape is not limited to an anisotropic conductive material tape, An isotropic conductive material tape, an insulating material Another adhesive tape such as a tape may be wound around the core. The isotropic conductive material tape includes an adhesive layer having isotropic conductivity, and the content of conductive particles contained in the adhesive layer is greater than that of the adhesive layer of the anisotropic conductive material tape. The insulating material tape includes an adhesive layer that does not contain conductive particles and has electrical insulating properties.

DESCRIPTION OF SYMBOLS 1 ... Winding body, 2 ... Core, 2a ... One end, 2b ... Other end, 3 ... Anisotropic conductive material tape (adhesive tape), 4 ... Base film, 5 ... Adhesive layer (Anisotropic conductive material layer) ), 6... First winding portion, 7... Second winding portion, L ₀ .

Claims (2)

A wound body comprising an adhesive tape having a base film and an adhesive layer provided on the base film, wherein the adhesive tape is wound around a core extending in the axial direction. And
A first circumferential portion around which the adhesive tape is wound along the circumferential surface of the winding core while shifting the position in the axial direction from one end side to the other end side of the winding core;
Adjacent to the outer periphery in the radial direction with respect to the first circumferential portion, the adhesive along the circumferential surface of the core while shifting the position in the axial direction from the other end side to the one end side of the core A second winding portion around which the tape is wound,
The base film has a breaking strength of 80 MPa or more and 400 MPa or less, and a breaking elongation of 30% or more and 200% or less,
The adhesive tape is an anisotropic conductive material tape comprising an anisotropic conductive material layer in which conductive particles for obtaining conduction between electrodes are mixed with a resin as the adhesive layer,
Wrapping of the adhesive tape, wherein the adhesive tape of the first circumferential portion and the adhesive tape of the second circumferential portion intersect when viewed from the outside in the radial direction body.   The wound body of the adhesive tape according to claim 1, wherein a gap is formed between the adhesive tapes adjacent to each other in the axial direction.

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