JP6156476B2 - Laminated film - Google Patents

Description

  The present invention relates to a laminated film.

  Conventionally, when handling a sheet-like film, a wide sheet-like film formed from raw materials is generally cut into an appropriate width and wound into a roll. For film cutting, for example, a cutting device such as a gobel blade slitter and a gang slitter is widely used.

  The Gobel type slitter is a slitter that includes an upper blade and a lower blade that rotate by sliding the side end portions of each blade edge in sliding contact, and cuts through a film between the upper blade and the lower blade. As a slitter of this method, for example, Patent Document 1 discloses a disk-shaped slit blade having a receiving blade formed along an annular groove on a side surface of a receiving roller in contact with a metal foil, and a sharp bladed portion on an outer peripheral edge portion. And a slitter that rotates both blades in a state where the tip of the bladed portion of the slit blade is received in the annular groove of the roller.

  The gang-type slitter is a slitter that includes a pair of upper blades and a pair of lower blades arranged at predetermined intervals, and cuts the film by engaging the lower blades with the respective outer surfaces of the upper blades. As a slitter of this system, for example, in Patent Document 2, a plurality of annular upper blades fixed to one rotating shaft at a predetermined interval and a plurality of annularly arranged axially movable on the other rotating shaft are disclosed. A slitter that includes a lower blade and rotates both blades in a state where both side surfaces of the upper blade are sandwiched by the lower blade is disclosed.

JP 2003-117886 A Japanese Utility Model Publication No. 7-15291

  When slitting a laminated film consisting of a plurality of layers with a Gobel type slitter, if the blade edge of the blade edge that is in sliding contact with the upper blade is too small as a lower blade, burrs will occur on the cut surface, and the product or There was a possibility that the equipment was contaminated and the yield was lowered. On the other hand, if a blade having an excessively large blade edge angle in sliding contact with the upper blade is used as the lower blade, the layer of the laminated film may be peeled off, leading to a decrease in yield.

  The improvement of conventional cutting performance in slitters has been done by adjusting the outer diameter of the upper and lower blades, adjusting the rotational speed, and adjusting the inclination angle of the lower blade with respect to the upper blade. Are often accompanied by large-scale equipment remodeling and component changes, and there has been concern about an increase in the burden and cost of the management process.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a laminated film that can suppress generation of burrs and peeling of layers by a simple method.

  In order to solve the above problems, the laminated film according to the present invention is a laminated film in which a resin film and an outermost protective film for protecting the resin film are laminated, and the resin film and the protective film are laminated films. It is exposed at the end face, and the resin film on the end face has an interface that moves from the fracture layer to the shear layer along the direction from the resin film to the protective film.

  In this laminated film, generation | occurrence | production of the burr | flash in a resin film can be suppressed effectively.

  The laminated film according to the present invention is a laminated film in which a resin film and an outermost protective film for protecting the resin film are laminated, and the resin film and the protective film are exposed on the end face of the laminated film, It is characterized in that burrs having a length of less than 300 μm are intermittently included in the resin film on the end face.

  In this laminated film, the burr in the resin film is suppressed, so that the yield can be improved.

  Moreover, 150 micrometers-180 micrometers of each average thickness of a resin film and a protective film may be sufficient.

  According to the present invention, the generation of burrs and peeling of layers can be suppressed by a simple method.

It is a perspective view which shows an example of the cutting apparatus used for the cutting method of the laminated film which concerns on this invention. It is a side view of an upper blade and a lower blade. It is sectional drawing of an upper blade and a lower blade. It is sectional drawing which shows an example of the laminated constitution of a laminated film. It is a figure which shows the process of the cutting of a laminated film. FIG. 6 is a diagram showing a step subsequent to FIG. 5. FIG. 7 is a diagram showing a step subsequent to FIG. 6. It is a figure which shows the mode of the cut surface of the laminated | multilayer film in the cutting method of the laminated | multilayer film which concerns on a comparative example. It is a figure which shows the mode of the cut surface of the laminated film in the cutting method of the laminated film which concerns on an Example. It is a figure which shows the effect confirmation test result of the cutting method of the laminated film which concerns on this invention.

  Hereinafter, a preferred embodiment of a laminated film cutting method and a laminated film according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing an example of a cutting apparatus used in the method for cutting a laminated film according to the present invention. As shown in the figure, the cutting device 1 is cut by the feeding unit 2 that feeds out the laminated film F1, the cutting unit 5 that cuts the laminated film F1 fed out from the feeding unit 2, and the cutting unit 5. A plurality of winding portions 6 for winding the laminated film F1 are provided.

  The feeding unit 2 has a rotating shaft 3 on which a raw roll F2 formed by winding the laminated film F1 can be set. A tension roller 4 that applies a predetermined tension to the laminated film F1 fed out from the feeding unit 2 is disposed on the downstream side of the feeding unit 2.

  The cutting part 5 has the upper blade 7 arrange | positioned at the upper side of the laminated | multilayer film F1 conveyed from the supply part 2, and the lower blade 8 arrange | positioned at the lower side. Each of the upper blade 7 and the lower blade 8 has a disk shape, and is fixed to rotating shafts 9 and 10 disposed substantially parallel to each other with the laminated film F1 interposed therebetween. Further, the upper blade 7 and the lower blade 8 are arranged at a plurality of locations (three locations in the present embodiment) with a predetermined interval so as to be paired vertically.

  On the downstream side of the cutting unit 5, a sorting roller 11 that distributes the laminated film F1 cut into a plurality of pieces by the cutting unit 5 is arranged. The original fabric roll F2 is bent in a mountain shape between the tension roller 4 and the distribution roller 11 so that the cutting portion 5 becomes the top, and is cut by a cutting method called shear cutting.

  The winding unit 6 has a rotating shaft 12 that winds the laminated film F1 sorted by the sorting roller 11. A split roll 13 is formed on the rotating shaft 12 by winding the cut laminated film F1.

  Next, the upper blade 7 and the lower blade 8 described above will be described in more detail.

  FIG. 2 is a side view of the upper blade 7 and the lower blade 8. FIG. 3 is a cross-sectional view of the upper blade 7 and the lower blade 8. As shown in FIGS. 2 and 3, the upper blade 7 and the lower blade 8 are in a state in which the side edge portions of the blade edges 7 a and 8 a are in sliding contact with each other, and constitute a so-called Gobel type slitter. The upper blade 7 and the lower blade 8 are formed of, for example, high speed tool steel (SKH), alloy tool steel (eg, SKD), or the like, and are appropriately set based on the thickness of the laminated film F1 to be cut and the cutting conditions. . The thickness t1 of the upper blade 7 and the thickness t2 of the lower blade 8 are also appropriately set based on the thickness of the laminated film F1 and the like.

  The blade edge 7a of the upper blade 7 has a slidable contact surface 7b that is slidably contacted with the lower blade 8 substantially orthogonal to the rotation shaft 9, while its opposite surface 7c is inclined with respect to the rotation shaft 9, and the blade edge angle θ1 is 80 to 90 °, preferably from 80 to 85 ° from the viewpoint of suppressing layer peeling described later. Further, the cutting edge 8a of the lower blade 8 has a slidable contact surface 8b slidably contacting the upper blade 7 inclined with respect to the rotation shaft 10, while its opposite surface 8c is substantially orthogonal to the rotation shaft 10. The cutting edge angle θ2 is preferably 80 ° to 90 °, and preferably 85 ° to 90 ° from the viewpoint of cutting stability.

  As shown in FIG. 3, the overlapping amount of the upper blade 7 with respect to the lower blade 8, that is, the penetration depth D is set to be 0.7 mm to 1.0 mm. Further, the amount of the upper blade 7 with respect to the lower blade 8 is 0.1 mm to 0.3 mm. In general, a screw (not shown) for pushing the upper blade 7 in the axial direction of the rotary shaft 9 is attached to the cutting device 1, and the amount of shift can be adjusted based on the gauge of the screw. The state in which the cutting edge 7a of the upper blade 7 and the cutting edge 8a of the lower blade 8 are in contact with each other without being pressed is a moving amount of 0.0 mm. The cutting edge 7a of 7 is pressed against the cutting edge 8a of the lower blade 8 and warps very slightly.

  FIG. 4 is a cross-sectional view showing an example of the layer configuration of the laminated film F1 to be cut. In the example shown in the figure, the laminated film F1 includes a first protective film 21 which is one outermost layer, a first resin film 22 having an adhesion function, and a second having an insulating and shape retaining function. The resin film 23, the third resin film 24 having a different adhesion function from the first resin film 22, and the second protective film 25 serving as the other outermost layer are laminated in this order. .

  In this laminated film F1, the average thickness of each film is preferably 150 μm to 180 μm, and more preferably 155 μm to 175 μm. Further, the width of the laminated film F1 is preferably 4 mm or more after cutting, and more preferably 7.5 mm or more.

  The first protective film 21 is made of, for example, polyethylene terephthalate. The tensile strength of the first protective film 21 is preferably, for example, 48 MPa to 73 MPa, and more preferably 50 MPa to 60 MPa.

  The first resin film 22 is formed of, for example, a polyimide film. For example, the tensile strength of the first resin film 22 is preferably 200 MPa to 600 MPa, and more preferably 400 MPa to 600 MPa. The peel strength between the first resin film 22 and the first protective film 21 is preferably 0.01 N / cm to 0.1 N / cm, and 0.05 N / cm to 0.1 N / cm. More preferably, it is cm. Examples of such a film include an adhesive film made of a resin composition described in JP-A-7-242820.

  The second resin film 23 is formed of, for example, a polyimide film. The tensile strength of the second resin film 23 is preferably, for example, 200 MPa to 600 MPa, and more preferably 400 MPa to 600 MPa. Examples of such a film include Upilex made of Ube Industries' polyimide film.

  The third resin film 24 is also formed of, for example, a polyimide film. The tensile strength of the second resin film 23 is preferably, for example, 200 MPa to 600 MPa, and more preferably 400 MPa to 600 MPa. As such a film, the adhesive film which consists of a resin composition described in Unexamined-Japanese-Patent No. 7-242820 is mentioned similarly to the 1st resin film 22, for example.

  The second protective film 25 is formed of, for example, polyethylene terephthalate, similarly to the first protective film 21. The tensile strength of the second protective film 25 is preferably 48 MPa to 73 MPa, and more preferably 50 MPa to 60 MPa, for example. The peel strength between the second protective film 25 and the third resin film 24 is preferably 0.01 N / cm to 0.1 N / cm, and 0.05 N / cm to 0.1 N / cm. More preferably, it is cm.

  When cutting such a laminated film F1 with the cutting device 1, first, as shown in FIG. 5, the laminated film F1 inserted into the upper blade 7 and the lower blade 8 is the tip of the cutting edge 7a of the upper blade 7. And the tip of the lower blade edge 7b. Next, as shown in FIG. 6, the upper blade 7 enters toward the lower blade 8, and the cutting of the laminated film F1 is started from the second protective film 25 side toward the first protective film 21 side, Finally, as shown in FIG. 7, the upper blade 7 and the lower blade 8 are slidably contacted so that the penetration depth D of the upper blade 7 with respect to the lower blade 8 is 0.7 mm to 1.0 mm. F1 is cut.

  Here, FIG. 8 is a view showing a state of the cut surface of the laminated film F1 when using an upper blade and a lower blade with sharp edges (less than 80 °) as in the prior art. As shown in the figure, when the laminated film F1 is cut by a conventional cutting method, when the laminated film F1 is viewed in the cutting direction (the direction from the upper blade to the lower blade), it is directed from the upper layer to the lower layer side. Thus, the fracture layers 31 and the shear layers 32 are alternately formed. In addition, sagging 33 occurs in the cut surface of the first fracture layer 31, and a return 34 occurs in the cut surface of the last fracture layer 31.

  In this conventional cutting method, the cutting property when the upper blade enters the laminated film F <b> 1 becomes excessive, so that the first shear layer 32 reaches the second resin film 23. For this reason, in the 2nd resin film 23, the interface 35 which transfers to the fracture | rupture layer 31 from the shear layer 32 arises, and the continuous burr | flash 36 will generate | occur | produce along the width direction of the laminated film F1.

  Moreover, in the conventional cutting method, when the upper blade 7 enters, the 1st protective film 21 used as the outermost layer turns into the fracture | rupture layer 31. FIG. For this reason, the first protective film 21 is bent, the peel strength between the first protective film 21 and the first resin film 22 is superior to the adhesive strength, and the first protective film 21 and the first resin film 22. There is a possibility that the layer peeling 37 may occur at the interface with.

  On the other hand, in the cutting method of the present embodiment, the blade edge angle θ1 of the blade edge 7a of the upper blade 7 is 80 ° to 90 °, preferably 80 ° to 85 °, and the blade edge angle of the blade edge 8a of the lower blade 8 is. θ2 is 80 ° to 90 °, preferably 85 ° to 90 °. Moreover, the approach depth D of the upper blade 7 with respect to the lower blade 8 is 0.7 mm-1.0 mm.

  In this cutting method, when the laminated film F1 is viewed in the cutting direction, the rupture layers 31 and the shear layers 32 are alternately formed from the upper layer toward the lower layer side. It is the same as the conventional cutting method in that sagging 33 occurs and a return 34 is generated in the cut surface of the last fractured layer 31. However, in this cutting method, as shown in FIG. 9, the cutting ability when the upper blade 7 enters the laminated film F <b> 1 is suppressed, and the thicknesses of the initial fracture layer 31 and the shear layer 32 are reduced. For this reason, in the 2nd resin film 23, the interface 38 which transfers to the shear layer 32 from the fracture | rupture layer 31 arises, and only the burr | flash 39 less than 300 micrometers in length will be included intermittently.

  Moreover, the thickness of the shear layer 32 becomes thicker than before, and the cut surface of the first protective film 21 that is the outermost layer becomes a thick shear layer 32. Thereby, the bending of the 1st protective film 21 which arises when the upper blade 7 approachs is suppressed, and the layer peeling of the 1st protective film 21 from the 1st resin film 22 can be suppressed.

  In the cutting method according to the present embodiment, the amount of movement of the upper blade 7 with respect to the lower blade 8 is set to 0.1 mm to 0.3 mm. Thereby, generation | occurrence | production of the burr | flash 36 by the cutting conditions mentioned above and the layer peeling 37 can be suppressed more effectively.

  Hereinafter, the evaluation test of the cutting method of the laminated film according to the present invention will be described.

  In this evaluation test, an original fabric roll having a width of 480 mm and a length of 300 m was manufactured by forming an original fabric of a laminated film from raw materials and winding it. And this raw fabric roll was cut | judged with the cutting apparatus, and the division | segmentation roll of width 11mm and length 60m was manufactured by winding on the core material of diameter 3 inches, providing 150g / 11mm tension | tensile_strength. The material of the upper blade and the lower blade was SKH2, and the amount of the upper blade approaching the lower blade was 0.15 mm.

  When observing the cut surface of the split roll, a film having a predetermined length is cut out from the split roll, and fixed with a predetermined jig so that the cut surface can be observed from the side, and a digital microscope (VHX manufactured by Keyence Corporation) is used. -200) was used for imaging at 300 × field of view, and the presence or absence of delamination of the burr (resin exceeding 300 μm in length) in the resin film and the protective film as the outermost layer was confirmed.

  The cutting direction of the split roll can be determined by observing the sagging and returning of the upper and lower ends of the film. In addition, the fracture layer and the shear layer are parts where the fracture layer is not glossy and the film is torn off by the impact at the time of cutting, whereas the shear layer is glossy and the part where shear is remarkable. It is possible to discriminate by the fact that the vertical stripes are inserted along the cutting direction.

  FIG. 10 is a diagram showing the results of the evaluation test. As shown in the figure, the cutting edge angle of the cutting edge of the upper blade is 80 ° to 90 °, the cutting edge angle of the cutting edge of the lower blade is 85 ° to 90 °, and the depth of penetration of the upper blade with respect to the lower blade is 0.7 mm to In Examples 1 to 9 having a thickness of 1.0 mm, neither burr in the resin film nor peeling of the protective film as the outermost layer was observed. On the other hand, in Comparative Examples 1 to 3 in which the blade edge angle of the blade edge of the upper blade is sharper than that of the example, burrs in the resin film were observed.

  In Comparative Example 4 in which the penetration depth was 0.3 mm, the film was not completely cut, and in Comparative Example 5 in which the penetration depth was 0.6 mm, burrs on the resin film were observed. Furthermore, in Comparative Example 6 in which the penetration depth was 1.1 mm, peeling of the protective film as the outermost layer was observed. From the above results, it was confirmed that the cutting conditions of the present invention can suppress both the generation of burrs and the layer peeling.

  DESCRIPTION OF SYMBOLS 1 ... Cutting device, 7 ... Upper blade, 7a ... Blade edge, 8 ... Lower blade, 8a ... Blade edge, 21 ... 1st protective film, 22 ... 1st resin film, 23 ... 2nd resin film, 24 ... 1st 3 resin film, 25 second protective film, 31 break layer, 32 shear layer, 38 interface, 39 burr, D penetration depth, F laminated film, θ1 blade edge angle θ2 is the edge angle of the lower blade.

Claims (2)

A laminated film in which a resin film and an outermost protective film for protecting the resin film are laminated,
The interface in which the resin film and the protective film are exposed on the end face of the laminated film, and transition from the fracture layer to the shear layer on the resin film on the end face along the direction from the resin film to the protective film. Exists ,
An average thickness of each of the resin film and the protective film is 150 μm or more . The laminated film according to claim 1 , wherein each of the resin film and the protective film has an average thickness of 150 μm to 180 μm.

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