Laminated film winding

Abstract

To provide a laminated film roll capable of suppressing occurrence of winding deviation of and wrinkles in a lead section even when an adhesive layer is provided on a base material film.SOLUTION: In a laminated film roll 11, a laminated film 13 includes: a base material film 14; an adhesive layer 15 provided on one surface side of the base material film 14; and a functional film 16 having a predetermined pattern and bonded to one surface side of the base material film 14 by the adhesive layer 15. A lead portion P2 indicating a terminal end of the laminated film 13 by the non-disposition of the functional film 16 is provided at an end portion of a beginning edge of the laminated film 13 relative to a winding core 12. The lead portion P2 is separated from a beginning side edge 13a by a body portion P1 where the functional film 16 is disposed.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a laminated film wound body.

Background Art

[0002] In recent years, in the field of semiconductor devices, demands for higher integration, miniaturization, and high speed have been increasing. As one aspect of semiconductor devices, there is a structure in which a semiconductor chip is laminated on a controller chip disposed on a substrate. The semiconductor assembly described in Patent Document 1 has a structure called a so-called dorman structure (or tunnel structure). This conventional semiconductor assembly includes a package substrate, a controller die disposed on the package substrate, and a memory die disposed above the controller die, and the memory die is supported by a support member such as a pillar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the semiconductor assembly of Patent Document 1 described above, a resin film with a silicon chip is used as a support member of the dorman structure using the same process as the manufacture of ordinary semiconductor chips. However, this method requires the use of relatively expensive silicon chips and a wafer polishing process. Therefore, a method of forming a support piece of the dorman structure by fragmenting a film for forming a support piece without using a silicon chip has been studied.

[0005] This method can utilize, for example, a laminated film in which a support piece forming film and a cutting aid film are laminated on one side of a base film. Such a laminated film is manufactured, for example, by pre-cutting the support piece forming film on one side of the base film into a predetermined pattern, and then pre-cutting the laminated cutting aid film into a predetermined pattern. However, if the support piece forming film in contact with the base film does not have adhesive properties, the support piece forming film will not be fixed on the base film, which may hinder the progress of pre-cutting the support piece forming film. To address this problem, it is conceivable to provide an adhesive layer on the base film side. In this case, the support piece forming film is fixed on the base film by the adhesive layer, and pre-cutting of the support piece forming film can be performed effectively.

[0006] On the other hand, when an adhesive layer is provided on the base film, another problem may arise when winding the manufactured laminated film onto a core. At the end of the laminated film on the winding side relative to the core, a lead portion may be provided where a functional film such as a support piece forming film is not provided, from the viewpoint of detecting the end of the laminated film. When a lead portion is provided on a film with an adhesive layer on the base film, the adhesive layer is exposed on the film surface in the lead portion. As a result, when winding the laminated film onto the core, the adhesive layer may adhere to the core, and there is a risk that winding misalignment or wrinkles may occur in the lead portion.

[0007] This disclosure was made to solve the above-mentioned problems, and aims to provide a laminated film winding body that can suppress winding misalignment and wrinkles in the lead portion, even when an adhesive layer is provided on the base film. [Means for solving the problem]

[0008] A laminated film winding according to one aspect of the present disclosure is a laminated film winding comprising a core and a laminated film wound around the core, wherein the laminated film comprises a base film, an adhesive layer provided on one side of the base film, and a functional film having a predetermined pattern and bonded to one side of the base film by the adhesive layer, and a lead portion is provided at the end of the laminated film on the winding start side relative to the core, where the functional film is not arranged to indicate the end of the laminated film, and the lead portion is spaced apart from the winding start edge by a main body portion on which the functional film is arranged.

[0009] In this laminated film winding system, an adhesive layer is positioned on one side of the base film within the laminated film. This allows the functional film to be fixed to the base film, enabling efficient pre-cutting of the functional film. In the laminated film, the functional film is not positioned at the lead portion indicating the end of the laminated film, so the adhesive layer provided on one side of the base film is exposed. On the other hand, the lead portion is separated from the edge at the winding start side by the main body portion on which the functional film is positioned. Therefore, when winding the laminated film onto the core, the main body portion on which the functional film is positioned is wound onto the core before the lead portion, thus preventing the adhesive layer of the base film from adhering to the core. Consequently, in this laminated film winding system, even when an adhesive layer is provided on the base film, misalignment and wrinkles in the lead portion can be suppressed.

[0010] The lead portion may be spaced at least as far as the circumference of the core from the edge on the winding start side. In this case, the main body portion on which the functional film is placed covers the core before the lead portion begins to be wound onto the core, thus more reliably preventing the adhesive layer of the base film from adhering to the core. Therefore, the occurrence of winding misalignment and wrinkles in the lead portion can be more reliably suppressed.

[0011] The length of the main body portion from the edge on the winding start side may be between 0.4m and 1.5m. When winding the laminated film onto the core, an auxiliary roll may be used to align the laminated film with respect to the core. By setting the length of the main body portion from the edge on the winding start side within the above range, it is possible to suppress the adhesion of the adhesive layer of the base film to the auxiliary roll at the start of winding the laminated film (when aligning the laminated film with respect to the core), compared to the arrangement of a typical auxiliary roll. This effectively suppresses winding misalignment and wrinkles in the lead portion. Furthermore, by setting the length of the main body portion from the edge on the winding start side to less than the above range, waste of the main body portion beyond the lead portion can be reduced.

[0012] The length of the lead portion may be between 0.8m and 1.5m. By setting the length of the lead portion within this range, accurate end detection of the laminated film can be achieved.

[0013] The functional film may be composed of a cutting aid film and a support piece forming film bonded to one side of a base film by an adhesive layer. In this case, a support piece for a semiconductor device having, for example, a dolmen structure can be easily obtained using the cutting aid film and the support piece forming film.

[0014] The laminated film may be wound onto the core so that the functional film faces the core. This improves convenience when unwinding the laminated film from the core for use. Even when the functional film faces the core, when winding the laminated film onto the core, the main body portion with the functional film is wound onto the core before the lead portion, thus preventing the adhesive layer of the base film from adhering to the core. Therefore, misalignment and wrinkles in the lead portion can be suppressed.

[0015] The film for forming support pieces has a thermosetting resin layer and a high-rigidity layer that is more rigid than the thermosetting resin layer, and the high-rigidity layer may be joined to one side of the base film via an adhesive layer. By including a layer with high rigidity in the film for forming support pieces, while the followability to the protruding jig decreases, the followability to a pickup tool such as a suction collet can be enhanced. Further, by joining the high-rigidity layer to one side of the base film via an adhesive layer, the film for forming support pieces is firmly fixed to the base film, and pre-cutting of the film for forming support pieces can be suitably carried out.

Effects of the Invention

[0016] According to the present disclosure, even when an adhesive layer is provided on the base film, it is possible to suppress the occurrence of winding displacement and wrinkles in the lead portion.

Brief Description of the Drawings

[0017] [Figure 1] It is a schematic cross-sectional view showing an example of a semiconductor device having a dorman structure. [Figure 2] It is a schematic perspective view showing a laminated film wound body according to an embodiment of the present disclosure. [Figure 3] It is a schematic plan view of a laminated film. [Figure 4] It is a schematic cross-sectional view of a laminated film. [Figure 5] It is a schematic plan view of a lead portion of a laminated film. [Figure 6] It is a schematic cross-sectional view of a laminated film according to a modified example.

Modes for Carrying Out the Invention

[0018] Hereinafter, a preferred embodiment of a laminated film wound body according to one aspect of the present disclosure will be described in detail with reference to the drawings.

[0019] In the following description, the same reference numerals are used for the same elements, and redundant descriptions are omitted. The dimensions and dimensional ratios in the figures are for convenience and do not necessarily reflect the actual dimensions. In this specification, a numerical range indicated using "~" includes the numerical values described before and after "~" as the minimum value and the maximum value, respectively. In this specification, the upper limit value or the lower limit value of a numerical range described stepwise may be replaced with the upper limit value or the lower limit value of another numerical range at the same step.

[0020] In this specification, the "layer" includes both the mode formed on the entire surface of the object to be formed and the mode formed on a part of the object to be formed when observed as a plan view. The "process" in this specification is not necessarily limited to an independent process, and may include those whose intended actions of the process can be achieved even when they cannot be clearly distinguished from other processes.

[0021] First, an application example of the laminated film wound body 11 according to this embodiment will be described. Here, a semiconductor device having a dolmen structure is exemplified. FIG. 1 is a schematic cross-sectional view showing an example of a semiconductor device having a dolmen structure. The semiconductor device 1 shown in the figure includes a substrate 2, a controller chip 3 disposed on one surface of the substrate 2, a plurality of memory chips 4, 5, 6, and a plurality of wires W that electrically connect each of these chips to electrodes (not shown) on the substrate 2. The controller chip 3, the memory chips 4, 5, 6, and the wires W are sealed by a sealing material 7.

[0022] The substrate 2 is, for example, an organic substrate. The substrate 2 may be a metal substrate such as a lead frame. A plurality of support pieces D are disposed around the controller chip 3. An adhesive layer 8 is provided on one surface of each of the controller chip 3 and the memory chips 4, 5, 6. The controller chip 3 is fixed to the surface of the substrate 2 via the adhesive layer 8. The memory chips 4, 5, 6 are laminated stepwise via the adhesive layer 8 so that a connection space for the wires W is formed.

[0023] The stack of memory chips 4, 5, and 6 is supported above the controller chip 3 (on the opposite side from the substrate 2) by multiple support pieces D via the adhesive layer 8 on one side of the bottommost memory chip 4. In the example shown in Figure 1, wires W are used to connect the substrate 2 and the controller chip 3, but the substrate 2 and the controller chip 3 may also be connected by bump connections (for example, connections using Cu bumps and solder).

[0024] The laminated film winding body 11 according to this embodiment is a component used in the manufacture of the support piece D described above. Figure 2 is a schematic perspective view showing a laminated film winding body according to one embodiment of the present disclosure. Figure 3 is a schematic plan view thereof, and Figure 4 is a schematic cross-sectional view thereof. As shown in Figure 2, the laminated film winding body 11 is composed of a winding core 12 and a laminated film 13 wound around the winding core 12. The laminated film 13 is wound in multiple layers around the circumferential surface of the winding core 12 with the functional film 16, which will be described later, facing the winding core 12.

[0025] The core 12 is formed in a cylindrical shape from a plastic material such as ABS (Acrylonitrile Butadiene Styrene) resin. The size of the core 12 is appropriately set according to the size of the laminated film 13. The width of the core 12 is set according to the width of the laminated film 13. The width of the core 12 may be equal to the width of the laminated film 13, or it may be larger than the width of the laminated film 13. The diameter of the core 12 is set according to the length of the laminated film 13. The diameter of the core 12 is, for example, about 7.5 cm to 8.0 cm.

[0026] As shown in Figures 3 and 4, the main body portion P1 of the laminated film 13 comprises a base film 14, an adhesive layer 15 provided on one side of the base film 14, and a functional film 16 provided on one side of the adhesive layer 15. In this embodiment, the functional film 16 is composed of a cutting assist film 17 and a support piece forming film 18.

[0027] In this embodiment, the base film 14 is a long film that extends in one direction with a predetermined width. The cutting aid film 17 and the support piece forming film 18 are pre-cut into a predetermined pattern and arranged at predetermined intervals on one side of the base film 14 in the direction of the base film 14's extension. The base film 14 is the film that forms the base of the laminated film 13. The base film 14 is formed from a material such as polyethylene terephthalate (PET) or polyolefin. The base film 14 may be heat-shrinkable.

[0028] The adhesive layer 15 is a layer for suppressing the displacement of the functional film relative to the base film 14 during pre-cutting. The adhesive layer 15 is arranged over the entire surface of one side of the base film 14. As the constituent material of the adhesive layer 15, for example, acrylic adhesives, acrylic rubber adhesives, natural rubber adhesives, synthetic rubber adhesives, urethane adhesives, silicone adhesives, etc., can be used. The adhesive layer 15 preferably has slight tackiness so that the functional film 16 is fixed to one side of the base film 14 with appropriate adhesive force during pre-cutting, and the functional film 16 is peeled off from the base film 14 with a weak force when the functional film is used. The adhesive force of the adhesive layer 15 to the functional film 16 (high-rigidity layer 20 described later) is, for example, 0.03 N / 25 mm to 0.1 N / 25 mm.

[0029] The cutting aid film 17 is a film used to fix the support piece forming film 18 to a ring frame (not shown) or the like when manufacturing the support piece D. The cutting aid film 17 is pre-cut into a circle with a diameter smaller than the width of the base film 14 by a processing means such as punching. The cutting aid film 17 is positioned to cover the functional film 16, and the peripheral edge of the cutting aid film 17 is joined to one side of the base film 14 by the adhesive layer 15 described above. The cutting aid film 17 is made of, for example, an ultraviolet-curing adhesive and has the property of decreasing in adhesiveness when exposed to ultraviolet light. The adhesive layer of the cutting aid film 17 may be a pressure-sensitive (non-ultraviolet-curing) adhesive in addition to an ultraviolet-curing adhesive. As the cutting aid film 17, a film commonly known as a dicing film may be used from a functional standpoint.

[0030] In the example shown in Figure 3, a circular cutting aid film 17 is positioned in the center of the base film 14 in the width direction. In addition, cutting aid films 17, 17 are further positioned at both ends of the base film 14 in the width direction, surrounding the central circular cutting aid film 17. These cutting aid films 17, 17 at both ends do not serve as functional films 16, but they play a role in eliminating the difference in unevenness between the center and both ends of the laminated film 13 in the width direction when winding the laminated film 13 onto the core 12. As a result, even when the number of turns of the laminated film 13 increases, the occurrence of defects such as winding misalignment and voids due to the difference in unevenness can be avoided.

[0031] The support piece forming film 18 is the film from which the support piece D is formed. The support piece forming film is pre-cut into a circle with a diameter slightly smaller than the cutting aid film 17 by a processing means such as punching. In this embodiment, as shown in Figure 4, the support piece forming film 18 is composed of two layers: a thermosetting resin layer 19 and a high-rigidity layer 20 which has higher rigidity than the thermosetting resin layer 19. The thermosetting resin layer 19 is located on the cutting aid film 17 side. The high-rigidity layer 20 is located on the base film 14 side and is bonded to one side of the base film 14 by an adhesive layer 15.

[0032] The thermosetting resin layer 19 can reach a fully cured state (stage C) through a subsequent curing treatment after passing through a semi-cured state (stage B). The thermosetting resin composition includes an epoxy resin, a curing agent, and an elastomer (e.g., acrylic resin). The thermosetting resin composition may further include inorganic fillers and curing accelerators as needed. As the high-rigidity layer 20, for example, a polyimide layer or a metal layer can be used. By including the high-rigidity layer 20 in the support piece forming film 18, the conformability of the support piece D to the pickup tool when producing the support piece D can be improved. When a metal layer is used as the high-rigidity layer 20, the optical contrast between the resin material and the metal material can improve the visibility of the support piece D during pickup. As the metal layer, for example, a copper layer or an aluminum layer can be used.

[0033] The support piece forming film 18 may be pre-divided into multiple support pieces D by forming a notched pattern. The notched pattern may, for example, form a grid in a plan view. In this case, the rectangular support pieces D will be pre-arranged in a matrix on the support piece forming film 18. The notches may reach from one side to the other side of the support piece forming film by a full cut of the support piece forming film 18. The notches may reach the cutting aid film 17.

[0034] In preparing the laminated film 13 as described above, a laminate is prepared in which a support piece forming film 18 is provided on one side of a base film 14 and an adhesive layer 15. With the support piece forming film 18 fixed to the base film 14 by the adhesive layer 15, the support piece forming film 18 is pre-cut into a circular shape. When forming a cut pattern on the support piece forming film 18, a cut pattern is formed that extends over the entire thickness of the support piece forming film 18 before pre-cutting it into a circle, thereby dividing the support piece forming film 18 into multiple support pieces D.

[0035] Next, the excess portion of the support piece forming film 18 is peeled off by winding or other means, leaving the pre-cut circular portion. Then, the cutting aid film 17 is laminated to the base film 14 and the support piece forming film 18. After lamination of the cutting aid film 17, the cutting aid film 17 is pre-cut into a circular shape to form a central circular cutting aid film 17 and cutting aid films 17, 17 at both ends surrounding the circular cutting aid film 17. By peeling off the excess portion of the cutting aid film 17, the laminated film 13 shown in Figures 3 and 4 is obtained. By winding the obtained laminated film 13 onto a winding core 12 using a winding device (not shown), the laminated film winding body 11 shown in Figure 2 is obtained.

[0036] Next, we will explain the lead portion P2 of the laminated film 13 described above.

[0037] When winding the laminated film 13 onto the core 12, a lead portion P2 is provided at the beginning end of the laminated film 13 relative to the core 12, continuous with the main body portion P1, as shown in Figure 5, from the viewpoint of detecting the end of the laminated film 13. The lead portion P2 differs in structure from the main body portion P1, which has a functional film 16, in that it does not have a functional film 16. When unwinding the laminated film 13 from the core 12 and using it, the end of the laminated film 13 can be detected by detecting the lead portion P2 using image detection or the like.

[0038] In the example in Figure 5, the length L1 of the lead portion P2 is, for example, 0.8m to 1.5m. The length L1 of the lead portion P2 may also be 1.2m to 1.5m. In the example in Figure 5, if the length La from the midpoint of one adjacent functional film 16 to the midpoint of the other adjacent functional film 16 is considered as one unit of the functional film 16, then the length L1 of the lead portion P2 is the length of multiple units (in this case, four units) of the functional film 16.

[0039] In the lead portion P2, only the cutting assistance films 17, 17 at both ends, which do not serve as functional films 16, are positioned on one side of the base film 14. In other words, in the lead portion P2, the support piece forming film 18 and the cutting assistance film 17 are not positioned in the center of one side of the base film 14, and the adhesive layer 15 is exposed on one side of the base film 14.

[0040] If the adhesive layer 15 is exposed at the lead portion P2, it is possible that the adhesive layer 15 may adhere to the core 12 when winding the laminated film 13 onto the core 12 during the manufacturing of the laminated film winding body 11. If the adhesive layer 15 adheres to the core 12 when winding the laminated film 13 onto the core 12 begins, there is a risk that misalignment or wrinkles may occur at the lead portion P2.

[0041] In contrast, in the laminated film winding body 11, as shown in Figure 5, the lead portion P2 is separated from the winding start edge 13a of the laminated film 13 by the main body portion P1 on which the functional film 16 is arranged. In this embodiment, the lead portion P2 is separated from the winding start edge 13a by a distance of at least the circumference of the winding core 12. In the example in Figure 5, the length L2 of the main body portion P1 from the winding start edge 13a (i.e., the distance of the lead portion P2 from the winding start edge 13a) is shorter than the length L1 of the lead portion P2. Here, if the length of one unit of the functional film 16 described above is La, the length L2 of the main body portion P1 from the winding start edge 13a is less than the length of the lead portion P2 (in this case, 2 units).

[0042] When winding the laminated film 13 onto the core 12, an auxiliary roll 21 may be used to align the laminated film 13 with respect to the core 12, as shown in Figure 5. The auxiliary roll 21 is formed in a cylindrical shape from a metal material such as stainless steel. The size of the auxiliary roll 21 is, for example, about the same size as the core 12. When winding the laminated film 13 onto the core 12, the auxiliary roll 21 is positioned at a distance from the core 12 that is, for example, larger than the diameter of the core 12. The distance Lf between the core 12 and the auxiliary roll 21 (the distance from the central axis of the core 12 to the central axis of the auxiliary roll 21) is, for example, about 600 mm to 650 mm.

[0043] If the adhesive layer 15 of the base film 14 adheres to the auxiliary roll 21 during alignment, the accuracy of the alignment of the laminated film 13 with respect to the winding core 12 will decrease, which may result in misalignment or wrinkles in the lead portion P2. In this embodiment, when aligning the laminated film 13 with respect to the winding core 12, the length L2 of the main body portion P1 from the winding-start edge 13a is set so that the auxiliary roll 21 touches the main body portion P1, which is located on the winding-start edge 13a side of the lead portion P2, rather than the lead portion P2. That is, the length L2 of the main body portion P1 from the winding-start edge 13a is greater than the distance between the winding core 12 and the auxiliary roll 21. As described above, for example, if the distance Lf between the winding core 12 and the auxiliary roll 21 is about 600 mm to 650 mm, the length L2 of the main body portion P1 from the winding-start edge 13a is set to, for example, 0.4 m to 1.5 m.

[0044] As described above, in the laminated film winding body 11, the adhesive layer 15 is arranged on one side of the base film 14 in the laminated film 13. This allows the functional film 16 to be fixed to the base film 14, and the pre-cutting of the functional film 16 can be suitably carried out. In the laminated film 13, the functional film 16 is not arranged in the lead portion P2 that indicates the end of the laminated film 13, so the adhesive layer 15 provided on one side of the base film 14 is exposed. On the other hand, the lead portion P2 is separated from the edge 13a on the winding start side by the main body portion P1 on which the functional film 16 is arranged. Therefore, when winding the laminated film 13 onto the winding core 12, the main body portion P1 on which the functional film 16 is arranged is wound onto the winding core 12 before the lead portion P2, so that the adhesive layer 15 of the base film 14 does not adhere to the winding core 12. Thus, in the laminated film winding body 11, even when the base film 14 is provided with an adhesive layer 15, the winding misalignment and wrinkles of the lead portion P2 can be suppressed.

[0045] In this embodiment, the lead portion P2 may be spaced apart from the winding start edge 13a at a distance of at least the circumference of the winding core 12. In this case, since the main body portion P1 on which the functional film 16 is placed covers the winding core 12 before the lead portion P2 begins to be wound onto the winding core 12, the adhesive layer 15 of the base film 14 can be more reliably prevented from adhering to the winding core 12. Therefore, misalignment and wrinkles in the lead portion P2 can be more reliably prevented.

[0046] In this embodiment, the length L2 of the main body portion P1 from the winding starting edge 13a is 0.4m to 1.5m. By setting the length L2 of the main body portion P1 from the winding starting edge 13a to the above range, it is possible to suppress the adhesion of the adhesive layer 15 of the base film 14 to the auxiliary roll 21 at the start of winding the laminated film 13 (when aligning the laminated film 13 with the winding core 12) compared to a typical auxiliary roll arrangement. This effectively suppresses winding misalignment and wrinkles in the lead portion P2. Furthermore, by setting the length of the main body portion P1 from the winding starting edge 13a to less than the above range, it is possible to reduce waste of the main body portion P1 beyond the lead portion P2.

[0047] In this embodiment, the length L1 of the lead portion P2 is 0.8m to 1.5m. By setting the length L1 of the lead portion P2 within this range, the end of the laminated film 13 can be detected with high accuracy.

[0048] In this embodiment, the functional film 16 is composed of a cutting aid film 17 and a support piece forming film 18, which are bonded to one side of the base film 14 by an adhesive layer 15. This makes it possible to easily obtain a support piece D that constitutes, for example, a semiconductor device 1 (see Figure 1) having a dolmen structure, using the cutting aid film 17 and the support piece forming film 18.

[0049] In this embodiment, the laminated film 13 is wound around the core 12 such that the functional film 16 faces the core 12. This improves the convenience of unwinding the laminated film 13 from the core 12 for use. Even when the functional film 16 faces the core 12, as described above, when winding the laminated film 13 around the core 12, the main body portion P1, where the functional film 16 is placed, is wound around the core 12 before the lead portion P2, thus suppressing the adhesive layer 15 of the base film 14 from adhering to the core 12. Therefore, misalignment and wrinkles in the lead portion P2 can be suppressed.

[0050] In this embodiment, the support piece forming film 18 has a thermosetting resin layer 19 and a high-rigidity layer 20 which is more rigid than the thermosetting resin layer 19. The high-rigidity layer 20 is bonded to one side of the base film 14 via an adhesive layer 15. By including a high-rigidity layer in the support piece forming film 18, the ability to follow a lifting jig is reduced, while the ability to follow a pickup tool such as a suction collet is improved. Furthermore, because the high-rigidity layer 20 is bonded to one side of the base film 14 via the adhesive layer 15, the support piece forming film 18 is firmly fixed to the base film 14, allowing for suitable pre-cutting of the support piece forming film 18.

[0051] This disclosure is not limited to the embodiments described above. For example, in the embodiments described above, the length L2 of the main body portion P1 from the winding starting edge 13a is shorter than the length L1 of the lead portion P2. However, the length L2 of the main body portion P1 from the winding starting edge 13a may be equal to the length L1 of the lead portion P2, or it may be longer than the length L1 of the lead portion P2.

[0052] In the above embodiment, the support piece forming film 18 is composed of two layers: a thermosetting resin layer 19 and a high-rigidity layer 20. However, as shown in Figure 6, the support piece forming film 18 may be composed of three layers: a high-rigidity layer 20 and two thermosetting resin layers 19, 19 sandwiching the high-rigidity layer 20. The functional film 16 is not limited to the support piece forming film 18, but may be a film with other uses.

[0053] The gist of this disclosure is as follows: [1] to [7]. [1] A laminated film winding body comprising a core and a laminated film wound around the core, wherein the laminated film comprises a base film, an adhesive layer provided on one side of the base film, and a functional film that is pre-cut to a predetermined pattern and joined to one side of the base film by the adhesive layer, and a lead portion is provided at the end of the laminated film on the winding start side relative to the core, where the functional film is not arranged, thereby indicating the end of the laminated film, and the lead portion is spaced apart from the winding start edge by a main body portion on which the functional film is arranged. [2] The lead portion is spaced apart from the winding start edge at a distance of at least the circumference of the winding core, as in [1]. [3] The length of the main body portion from the edge on the winding starting side is 0.4m to 1.5m, as described in [1] or [2]. [4] The length of the lead portion is 0.8m to 1.5m, as described in any of [1] to [3]. [5] The functional film is composed of a cutting aid film and a support piece forming film bonded to one side of the base film by the adhesive layer, as described in any one of [1] to [4]. [6] The laminated film winding body according to any one of [1] to [4], wherein the laminated film is wound around the core such that the functional film faces the core side. [7] The laminated film winding body according to [5], wherein the film for forming the support piece has a thermosetting resin layer and a high-rigidity layer which is more rigid than the thermosetting resin layer, and the high-rigidity layer is bonded to one side of the base film via the adhesive layer. [Explanation of symbols]

[0054] 11...Laminated film winding, 12...Core, 13...Laminated film, 13a...Edge, 14...Base film, 15...Adhesive layer, 16...Functional film, 17...Cutting aid film, 18...Support piece forming film, 19...Thermosetting resin layer, 20...High rigidity layer, P1...Main body portion, P2...Lead portion, L1...Length of lead portion, L2...Length of main body portion from the edge on the winding start side.

Claims

1. A laminated film winding body comprising a core and a laminated film wound around the core, The laminated film is A base film and An adhesive layer provided on one side of the base film, A functional film having a predetermined pattern and bonded to one side of the base film by the adhesive layer, At the end of the laminated film on the winding start side relative to the core, a lead portion is provided that indicates the end of the laminated film by not having the functional film placed thereon. The lead portion is a laminated film winding body that is separated from the winding start edge by the main body portion on which the functional film is arranged.

2. The laminated film winding body according to claim 1, wherein the lead portion is spaced apart from the edge on the winding start side at a distance of at least the circumference of the winding core.

3. The laminated film winding body according to claim 1, wherein the length of the main body portion from the edge on the winding starting side is 0.4 m to 1.5 m.

4. The laminated film winding body according to claim 1, wherein the length of the lead portion is 0.8 m to 1.5 m.

5. The laminated film winding body according to any one of claims 1 to 4, wherein the functional film is composed of a cutting aid film and a support piece forming film bonded to one side of the base film by the adhesive layer.

6. The laminated film winding body according to any one of claims 1 to 4, wherein the laminated film is wound around the core such that the functional film faces the core side.

7. The support piece forming film comprises a thermosetting resin layer and a high-rigidity layer having higher rigidity than the thermosetting resin layer. The laminated film winding body according to claim 5, wherein the high-rigidity layer is bonded to one side of the base film via the adhesive layer.

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