JP2015101486A - Foil joining method of two-layer body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a peeling failure while suppressing occurrence of trapped air after joining of a two-layer body.SOLUTION: A foil joining method of the present invention includes the steps of: forming one and the other peeling surfaces 33 and 34 by separating a two-layer body 30 by a layer at an end 35 of an old roll material composed of the two-layer body 30; processing a starting end 75 of a new roll material composed of a two-layer body 70 into a shape in which a tip 80 of the roll material of a flowing direction downstream side is closed and the width becomes narrower toward the tip 80; bonding one outer surface 73 of the two-layer body 70 at the starting end 75 to the one peeling surface 33; and bonding the other outer surface 74 being an opposite side to the one outer surface 73 of the two-layer body 70 at the starting end 75 to the other peeling surface 34. Bonding force per unit area between the one outer surface 73 and the one peeling surface 33, and between the outer surface 74 and the other peeling surface 34 are greater than adhesion force per unit area between layers of the two-layer body 70 at the starting end 75.

Description

  The present invention relates to a foil splicing method, and more particularly to a two-layer foil splicing method.

  Patent Document 1 discloses a method for exchanging old and new roll materials wound with a multilayer long tape body.

JP 2011-093642 A

[Problem 1. Issues of background technology]
The inventors have found that the following problems arise when the method described in Patent Document 1 is applied to a two-layer foil splice. The problems shown below are not the problems described in the above-mentioned document, but are found by the inventors for the first time.

  FIG. 1 shows a method of joining a two-layer body 24 composed of a sheet 41 equivalent to the sheet 31 and a film 42 equivalent to the film 32 to the two-layer body 23 composed of the sheet 31 and the film 32. The bilayer body 23 is wound up as a web roll on the right side in the drawing, that is, downstream in the flow direction. The bilayer body 24 is continuously supplied by being unwound from the web roll on the left side in the drawing, that is, upstream in the flow direction.

  The sheet 31 and the film 32 are in close contact. The sheet 41 and the film 42 are in close contact with each other. Following the method described in Patent Document 1, the end of the bilayer body 23 and the start end of the bilayer body 24 are each cut into a step shape. In this case, air tends to remain in the gap 25 when the foil is joined.

  As shown in FIG. 2, a case where the two-layer body passes through two apparatuses such as a transfer roll and a transfer machine that apply pressure to the two-layer body with the roll is considered. In the drawing, other films other than the two-layered body may pass through at the same time and may be in close contact with or bonded to the films 32 and 42. For convenience of explanation, this is omitted in the figure.

  The rollers 51 and 52 rotate in synchronism with the directions of the rotation directions 54 and 55, respectively, in order to send the two-layer body in the flow direction 57. The two-layered body joined as described above is passed in the flow direction 57 while applying pressure between the rollers 51 and 52.

  At this time, an air reservoir 26 may be generated upstream or behind the gap 25. The air reservoir 26 may cause unevenness in the film 42 and impair the flatness thereof. Further, as described above, when another film is brought into close contact with the film 42, the other film may be wrinkled.

  In FIG. 3, a two-layered body composed of a sheet 41 and a film 27 equivalent to the sheet 31 and a thin-filmed film 29 is joined by a foil. Thus, if the difference in thickness between the two layers is large, air tends to remain in the gap 28 of the seam, and the foil seam may be difficult.

[Problem 2. Issues of other foil splicing methods]
The inventors tried to improve the foil splicing method. The bilayer bodies 30 and 40 shown in FIG. 4 are bilayer bodies equivalent to the bilayer bodies 23 and 24 described above. Similarly to the above, the two-layer body 30 is wound up as a roll material. Further, the two-layer body 40 is unwound from the state of the roll material. As shown in the upper part of FIG. 4, the end 35 is located upstream of the intermediate portion 36 of the bilayer body 30. A start end 45 is located downstream of the intermediate portion 46 of the bilayer body 40. The distal end 35 and the starting end 45 are not particularly molded and are cut substantially perpendicular to the winding direction.

  In this method, as shown in the lower part of FIG. 4, the film 32 is peeled from the sheet 31 at the end 35. Further, as shown in FIG. 5, a double-sided tape 49 is affixed to the sheet 41 at the start end 45. A double-sided tape 48 is attached to the film 42, that is, the surface opposite to the double-sided tape 49.

  As shown in the upper part of FIG. As shown in the lower part of FIG. 6, the end 35 is taped to the start end 45. At the starting end 45, the double-sided tape 48 connects between the inner surface of the membrane 32 and the outer surface of the membrane 42. At the start end 45, the double-sided tape 49 connects between the inner surface of the sheet 31 and the outer surface of the sheet 41.

  Unlike the case of the problem 1, as shown in FIG. 2, even if it passes between the transfer rolls composed of the rollers 51 and 52, it is difficult for air accumulation to occur. The above is considered to be because the film 42 and the sheet 41 are in close contact with each other at the starting end 45. For convenience of explanation, other films to be transferred are omitted in the drawing.

  Here, as shown in FIG. 8, the films 32 and 42 are continuously peeled from the sheets 31 and 42. The film 32 is conveyed while being peeled in the flow direction 61 and the sheet 31 is conveyed in the flow direction 62.

  At this time, a peeling failure may occur at the joint, and the film 42 and the sheet 41 may not peel as designed. In such a peeling failure, the sheet 31 and the sheet 41 connected with the double-sided tape are peeled off and cut. For this reason, the sheet 41 is conveyed in the flow direction 61 while being bonded to the film 42. As a result, the film and sheet cannot be normally conveyed.

[Object of the present invention]
In view of the above, an object of the present invention is to provide a two-layer foil splicing method that can prevent the occurrence of air accumulation after foil splicing and also prevent separation failure.

  The foil splicing method according to one aspect of the present invention includes a step of separating the two-layer body one by one at the end of the old roll material composed of the two-layer body, and forming one and the other peeling surface; Processing the starting end of the new roll material made of a body into a shape in which the tip on the downstream side in the flow direction of the roll material is closed and the width becomes narrower toward the tip, and one outer side of the two-layer body at the starting end Bonding the one peeling surface to the surface, and bonding the other peeling surface to the other outer surface of the two-layer body at the starting end opposite to the one outer surface; Is provided.

  The bonding force per unit area of the one outer surface and the one peeling surface, and the other outer surface and the other peeling surface is the adhesion force per unit area between the layers of the bilayer body at the starting end. Bigger than. The tip is preferably joined to the one and the other peeling surfaces.

  The foil splicing method according to another aspect of the present invention includes a step of separating the two-layer body one by one at the end of the old roll material composed of the two-layer body, and forming one and the other peeling surface; A step of applying a double-sided tape to one and the other outer surfaces facing each other at the starting end of a new roll material comprising a body, and the leading end together with each double-sided tape, the downstream end in the flow direction of the roll material Is closed, and the width is narrowed toward the tip, and the opposite side of the double-sided tape affixed to the one outer surface is bonded to the one peel surface And bonding the opposite adhesive surface of the double-sided tape affixed to the other outer surface to the other release surface.

  The bonding force per unit area of the double-sided tape is greater than the adhesion force per unit area between the layers of the bilayer body at the starting end.

  The foil splicing method according to another aspect of the present invention is a foil splicing method for a roll material composed of two layers of different sheets and films. The method includes the steps of peeling the film from the sheet at the end of the old roll material to form the respective peel surfaces, and the outer surface of the sheet side at the starting end of the new roll material, and the film side facing this. A process of affixing double-sided tape to each outer surface, and processing of the starting end together with each double-sided tape into a shape in which the tip on the downstream side in the flow direction of the roll material is closed and the width becomes narrower toward the tip Attaching the opposite adhesive surface of the double-sided tape affixed to the sheet to the release surface of the sheet, and the opposite adhesive surface of the double-sided tape affixed to the membrane Bonding to the release surface of the film.

  The bonding force per unit area of the double-sided tape is greater than the adhesion force per unit area of the sheet and the film at the starting end. The sheet is preferably made of a resin thicker than the membrane, and the membrane is preferably an electrolyte membrane.

  At the tip, the two-layer body is preferably processed into a shape closed together with the double-sided tape by a straight line or a plane substantially orthogonal to the flow direction. It is preferable that the said shape is a shape which becomes thin toward the center from the both sides of a roll material. The shape is preferably substantially V-shaped.

  According to the present invention, it is possible to provide a two-layer foil splicing method that can prevent the occurrence of air accumulation and prevent poor peeling after foil splicing.

Problem 1. It is sectional drawing of the foil joint part concerning. Problem 1. It is sectional drawing which shows the air pocket produced by the foil splicing method concerning. Problem 1. It is sectional drawing which shows the clearance gap produced by the foil splicing method concerning. Problem 2 It is sectional drawing of the peeling process concerning. Problem 2 It is an enlarged view of the sticking process concerning. Problem 2 It is sectional drawing of the joining process concerning. Problem 2 It is sectional drawing which shows the peeling defect produced by the foil splicing method concerning. It is an enlarged view of the processing process concerning an embodiment. It is sectional drawing of the joining process concerning embodiment. It is a top view at the time of the transfer roll passage in the foil joint part concerning embodiment. It is sectional drawing which shows isolation | separation of the two-layer body in the foil joint part concerning embodiment. It is the side view 1 at the time of isolation | separation of the two-layer body in a foil joint part. It is the side view 2 at the time of isolation | separation of the two-layer body in a foil joint part. It is a block diagram which shows the operation | movement of the foil splicing concerning Example 1, and the whole transfer machine. It is sectional drawing of the foil joint part concerning the comparative example 2. FIG. It is sectional drawing which shows the air pocket produced by the foil splicing method concerning the comparative example 2. It is a top view which shows the shape of the foil joint part concerning Example 2. FIG. It is a top view which shows the shape of the foil joint part concerning Example 3. FIG. It is a top view which shows the shape of the foil joint part concerning the comparative example 3. FIG. It is a top view which shows the shape of the foil joint part concerning the comparative example 4.

[1. Overview]
Hereinafter, embodiments and examples will be described with reference to the drawings. In all the drawings, equivalent components are denoted by the same reference numerals, and description thereof will be omitted as appropriate. Further, a part of the drawings used in the problem to be solved by the invention will be explained.

  As shown in FIGS. 4, 6, and 9, the foil splicing method of the present embodiment is to join the start end 45 of the bilayer body 40 to the end 35 of the bilayer body 30. The intermediate portion 36 of the two-layer body 30 is continuously wound around a roll material or web roll on the winding side. The intermediate portion 46 of the two-layer body 40 is continuously unwound from the roll material or web roll on the sending side and conveyed to the winding side.

  In the present embodiment, the end 35 indicates a region of an end that is wound after the intermediate portion 36, that is, an end. The start end 45 indicates an end region that is unwound before the intermediate portion 46, that is, a start end portion. The end 35 and the start 45 have a width corresponding to the bilayers 30 and 40. They also have a length for forming a foil splice.

  The foil splicing method of this embodiment includes a peeling step (FIG. 4) for forming a peeling surface at the end of the old roll material, a processing step (FIG. 9) for processing the new roll material starting end into a predetermined shape, and the old roll material at the new roll material starting end. It consists of each process of the joining process (FIG. 6) which joins a terminal. Here, the order of the processing step and the peeling step is not limited. In this embodiment, you may further provide the sticking process (FIG. 5) which sticks the double-sided tape as a joining means to a two-layer body.

  Each layer in the bilayer body of the present embodiment is in close contact with a predetermined adhesive force. Such an adhesive force is a bonding force that is a limit that does not substantially destroy any layer when an arbitrary layer is peeled from the bilayer body, or a bonding force that is less than that.

  It consists of a sheet | seat and a film | membrane from which the bilayer body of this embodiment mutually differs. The sheet is preferably a back sheet made of a resin thicker than the film. The membrane is preferably an electrolyte membrane. In this embodiment, a roll material consists of such a two-layer body. The foil splicing method of this embodiment is a method of foil splicing an old roll material, hereinafter referred to as an old roll material, and a new roll material, hereinafter referred to as a new roll material.

  The foil splicing method of the present embodiment, after the foil splicing, continuously separates the two layers of the old roll material again or separates them from each other, and continuously separates the two layers of the new roll material from each other without interruption at the seam. Makes it possible to peel.

[2. Peeling process]
In the peeling step, as shown in the upper part of FIG. 4, the two-layer body 30 is separated one by one at the end 35 of the old roll material made of the two-layer body 30. The bilayer body 30 includes a sheet 31 and a film 32. The bilayer body 40 includes a sheet 41 and a film 42. The sheet 41 is equivalent to the sheet 31. The membrane 42 is equivalent to the membrane 32.

  At the end 35 of the old roll material, the film 32 is peeled from the fixed sheet 31 to form the respective peeled surfaces. The sheet 31 may be peeled from the fixed film 32. The sheet 31 and the membrane 32 may be separated by pulling in opposite directions. Thereby, one peeling surface 33 and the other peeling surface 34 are formed at the end 35 of the bilayer body 30.

  Which is fixed and which force to peel off is applied can be arbitrarily selected depending on the physical properties and characteristics of the roll material, the two-layer body 30, the sheet 31, and the film 32. For this reason, in the present embodiment, it is expressed that the film is peeled from the sheet for the sake of convenience. However, as a result, the two layers separated at the end 35 are all included in the technical scope.

[3. Pasting process]
In the sticking step, as shown in FIG. 5, at the starting end 45 of the new roll material made of the two-layered body 40, the outer surface 43 on the one sheet 41 side and the outer surface 44 on the other film 42 side facing each other, A double-sided tape 48 and / or a double-sided tape 49 is applied.

  When sticking, it is preferable to stick so that the double-sided tapes 48 and 49 face each other. On the other hand, it is not preferable that deviation occurs between the double-sided tapes. However, it can be considered that the “displacement” that tends to cause peeling failure in the next processing step is eliminated.

[4. Machining process]
In the processing step, as shown in FIG. 8, the starting end 45 of the new roll material made of the two-layer body 40 is processed into a predetermined shape. As described above, when the double-sided tapes 48 and 49 are used, the starting end 45 is processed into a predetermined shape together with each double-sided tape.

  The predetermined shape is a shape in which the right end 80 in the drawing is closed. In other words, the predetermined shape is a shape in which the width gradually decreases toward the tip 80. The right side in the figure is the downstream side in the flow direction 57 of the roll material.

  The roll material or the two-layer body 40 has a shape that narrows from both side portions toward the center. For example, the predetermined shape may be a shape that is cut by an oblique cut line 68 with respect to the flow direction 57 from the upper side of the plan view in FIG.

  Furthermore, the predetermined shape may be a shape that is cut by a cut line 69 oblique to the flow direction 57 from the lower side of the plan view toward the center of the starting end. Other preferred shapes are shown in the examples. The predetermined shape may be a substantial V shape as shown in FIG.

  In order to prevent separation failure, it is preferable that the cut lines 68 and 69 are substantially symmetric with respect to the center line of the bilayer body 40 parallel to the flow direction 57. The phrase “substantially symmetrical” means that the tensile force becomes asymmetrical on the left and right of the center line when the two-layer body 40 is transported, and the object does not cause wrinkles.

  The predetermined shape is preferably a shape that is formed by cutting at the tip 80 by a cut line 65 substantially perpendicular to the flow direction 57. The predetermined shape is also preferably closed by such a straight line or plane. The significance of cutting with the cut line 65 will be described later.

  In the drawing, the start end 45 having a predetermined shape is represented as a start end 75. In the drawing, the two-layer body 40 having the starting end 75 is represented as a two-layer body 70. Further, the sheet 41 and the film 42 having a predetermined shape at the start end 45 are represented as a sheet 71 and a film 72, respectively.

  In the drawing, outer surfaces 43 and 44 having a shape corresponding to a predetermined shape are represented as outer surfaces 73 and 74, respectively. Further, the double-sided tapes 48 and 49 having a shape corresponding to a predetermined shape are represented as double-sided tapes 78 and 79, respectively.

[5. Joining process]
Next, as shown in FIG. 9, one release surface 33 is joined to one outer surface 73 of the bilayer body 70 at the start end 75. The other peeling surface 34 is joined to the other outer surface 74 of the two-layer body 70 at the start end 75. The other outer surface 74 is on the opposite side of the outer surface 73 at the start end 75 with the contact surface between the sheet 71 and the film 72 interposed therebetween.

  The joining process when the double-sided tapes 78 and 79 are used is as follows. The adhesive surface 63 opposite to the sheet 71 or the outer surface 73 of the double-sided tape 78 attached to the one sheet 71 or the outer surface 73 is bonded to the one peeling surface 33.

  The adhesive surface 64 opposite to the outer surface 74 of the double-sided tape 78 attached to the other film 72 or the outer surface 74 is attached to the other peeling surface 34. Either of the above-mentioned bonding may be performed first or simultaneously.

  As described above, if the sheet 31, 41 or 71 is a back sheet against the film and has a strength higher than that of the film 32, 42 or 72, the sheet 71 at the start end 75 is first bonded to the sheet 31 at the end 35. May be. In such a case, the work of later bonding the film 72 at the start end 75 to the film 32 at the end 35 can be efficiently performed by supporting the back sheet.

[6. Bonding strength of outer surface and release surface]
As shown in FIG. 11, it is assumed that the bonding force per unit area of one outer surface 73 and one peeling surface 33 is larger than the adhesion force per unit area between layers of the two-layer body 70 at the start end 75. In other words, in the cross-section in the width direction of the foil joint, the adhesive force of the outer surface 73 and the peeling surface 33 as the material is greater than the adhesive force between the layers of the two-layer body 70 as the material.

  As described above, the double-sided tape 78 can be used to join the outer surface 73 and the release surface 33. In this case, when considered per unit area, the force with which the double-sided tape 78 connects the outer surface 73 and the release surface 33 is greater than the adhesion between the sheet 71 and the film 72. That is, the bonding force per unit area of the double-sided tape 78 is greater than the adhesion force per unit area between the layers of the two-layer body 70 at the starting end 75.

  When the double-sided tapes 78 and 79 are equivalent, the bonding force per unit area of the double-sided tape is greater than the adhesion force per unit area between the layers of the two-layer body 70 at the starting end 75. Further, the double-sided tapes 78 and 79 need not be the same.

  In any of the above cases, the bonding force per unit area of the other outer surface 74 and the other peeling surface 34 is greater than the adhesion force per unit area between the layers of the two-layer body 70 at the start end 75. In other words, in the cross-section in the width direction of the foil joint, the adhesive force of the outer surface 74 and the peeling surface 34 as the material is greater than the adhesive force between the layers of the two-layer body 70 as the material.

  As described above, the double-sided tape 79 can be used to join the outer surface 74 and the release surface 34. In this case, when considered per unit area, the force with which the double-sided tape 79 connects the outer surface 74 and the release surface 34 is greater than the adhesion force between the sheet 71 and the film 72. That is, the bonding force per unit area of the double-sided tape 79 is greater than the adhesion force per unit area between the layers of the two-layer body 70 at the starting end 75.

  When the double-sided tapes 78 and 79 are equivalent, the bonding force per unit area of the double-sided tape is greater than the adhesion force per unit area between the layers of the two-layer body 70 at the starting end 75.

[7. Explanation of air pool suppression effect]
After the foil splicing according to the present embodiment, consider the case where the rollers are pressed simultaneously from both sides in the same manner as in FIG. In the two-layer body 70, the two layers are not separated from each other at the time of foil joining, so that it is difficult for air to enter between the two-layer bodies 70, and air accumulation hardly occurs.

  On the other hand, in this embodiment, as shown in FIG. For this reason, in order to sandwich the two-layer body 70, it bonds together again. At this time, air easily enters between the sheet 31 and the film 32. The place where air enters is not limited to the joint at the time of foil joining.

  However, even in such a case, as shown in FIG. 10, the air that has entered the interlayer escapes to both sides of the bilayer body 30 along the cut lines 68 and 69 that substantially form a V shape. For this reason, the air or air bubbles remaining in the foil joint portion are not stretched as an air pool between the two-layer body 70 of the new roll in the course of conveyance.

[8. Explanation of effect of suppressing peeling failure]
Furthermore, as shown in FIG. 11, it is considered that the sheet 31 and the film 32 in the two-layer body 30 of the old roll material are separated from each other or separated from each other after the foil joining of the present embodiment.

  Here, as shown in FIG. 11, the joining force in the cross section of the sheet | seat 31 and the sheet | seat 71 in the width direction is set to F1. The joining force in the cross section in the width direction of the sheet 71 and the film 72 is defined as F2. The bonding force in the cross section in the width direction of the film 32 and the film 72 is F3.

  F1 and F3 are generated by double-sided tapes 78 and 79 as shown. Between the sheet | seat 71 and the film | membrane 72, the strong joining force F2 derived from the close_contact | adherence at the time of two layer stratification is maintained. This is in contrast to the fact that, at the end 35 once peeled off, the adhesive force of the portion that does not overlap the start end 45 is greatly lost.

  However, as described above, the bonding force between the outer surface and the peeling surface per unit area was made larger than the adhesion force between the layers of the two-layer body. For this reason, F2 is smaller than F1 and F3 everywhere in the starting end 75 shown in FIG.

  Here, as shown in FIG. 8, the bilayer body 70 has a good effect that the width gradually increases from the tip 80 toward the upstream in the flow direction. That is, F2 has the weakest interlayer adhesion at the narrowest tip 80, and is particularly easy to separate. F2 gradually increases as the two layers are sequentially separated from the right side of the figure.

  However, since the two layers have already started to be separated at the tip 80, it is easy to separate the entire two-layer body 70 along the flow directions 61 and 62. The effect is particularly great when compared with the case of peeling from the unprocessed state of FIG. 5 (FIG. 7).

Therefore, the roll material joined by the method of the present embodiment can continuously separate the sheet 71 and the film 72 in the two-layer body 70 of the new roll material or separate each other while performing such separation or separation. . For this reason, for example, as shown in FIG. 7, the problem that the joint portion is peeled off before the two layers of the two-layered body 40 of the new roll material are separated or separated from each other hardly occurs.
[9. Effect of cut line 65]

  By cutting along the cut line 65, the end portions or end surfaces of the sheet 71, the film 72, and the double-sided tapes 78 and 79 are aligned at the front end 80. A case where a double-sided tape is applied at a position shifted with respect to the flow direction without going through such a process will be described by taking double-sided tapes 48 and 49 as an example (FIG. 12).

  Here, it is assumed that the sheet 31 and the membrane 32 are separated. Due to the above-described deviation, not the separation of the sheet 41 and the film 42 but a force for separating the sheet 31 and the sheet 41 from the double-sided tape 48 works. For this reason, as illustrated in FIG. 13, a gap 81 is generated between the sheet 41 and the film 42 in the middle of the two-layer body, not the tip of the two-layer body.

  At this time, F2 acts at two locations downstream and upstream in the flow direction with the gap 81 therebetween. Therefore, the adhesive force between the sheet 41 and the film 42 against the separating force at the start end 45 is substantially doubled. For this reason, an unexpected force acts on the double-sided tape 48 and the sheets 31 and 41 are easily peeled off. From the above, it can be seen that the deviation at the tip is likely to cause peeling failure.

  On the other hand, the above double-sided tapes 78 and 79 are considered as follows. Consider the case where there is no cut by the cut line 65 in FIG. 8 and the tip 80 is sharp. In this case, F1 and F3 in FIG. 11 may not exhibit sufficient bonding force due to the small width, particularly in the separation of two layers at the tip 80.

  For this reason, there is a possibility that the sheet 71 and the film 72 do not peel from each other from the leading end 80 and cause peeling failure. In this embodiment, it is possible to prevent the occurrence of such a peeling failure by cutting the cut line 65 as described above.

[10. Variation of Embodiment]
Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, in this embodiment, the order of the attaching step and the peeling step are not limited.

  Moreover, in this embodiment, the said affixing process and the said process process do not ask | require an order mutually. For this reason, you may affix on the outer surface of the starting end of the new roll material which passed through the processing process, after cutting a double-sided tape into the shape according to a predetermined shape beforehand.

  Further, one or both of the double-sided tapes may be changed to an adhesive or other bonding means or bonding means. If the bonding means is an adhesive, the processing step may be performed together with the starting edge of the new roll material after the adhesive is applied. Conversely, the adhesive may be applied after performing the processing step.

  On the other hand, if the adhering means is a separate member or agent, it may be applied, applied, or arranged first on the end peeling surface of the old roll material. At this time, one or both of the peeling surfaces may be attached to the end of the peeling surface at the end of the old roll material first by attaching a member as an adhering means, applying an agent, or arranging them.

  If the sheets are resin sheets, heat may be used as the joining means, and the sheets may be heat-welded. In addition, a member for assisting adhesion or bonding may be attached, an agent may be applied, or these may be disposed on the peeling surface at the end of the old roll material or the outer surface of the start end of the new roll material.

  In the present embodiment, the cutting is performed at the tip by a cut line substantially perpendicular to the flow direction. In a modified example, the double-sided tape and the two-layer body may be cut in such a shape in advance and then pasted so that they are aligned at the tip.

[1. Overview of web roll operation]
Taking the manufacture of a fuel cell as an example, the foil splicing method of this embodiment will be described together with examples. As shown in FIG. 14, in the manufacture of the fuel cell, the anode catalyst and the cathode catalyst are sequentially transferred to the electrolyte membrane. Since the electrolyte membrane is thin and lacks rigidity, the electrolyte membrane is conveyed on the web while being bonded to a back sheet or slip sheet.

  The two-layer body 30 is sent out from the roll 100 along the flow direction 91. A dummy sheet 97 coated with an anode catalyst, hereinafter referred to as an An catalyst 96, is sent out along the flow direction 92. An An catalyst 96 is overlaid on the rubber heat roller 101 on the membrane 32 which is an electrolyte membrane provided in the bilayer body 30.

  The An catalyst 96 is transferred to the film 32 by the heat roller 101 and the metal heat roller 102. The heat rollers 101 and 102 function as transfer rollers. The dummy sheet 97 is peeled off together with the remaining part 98 of the An catalyst 96. The dummy sheet 97 is peeled off from the laminated body including the An catalyst 96 in the flow direction 93 with the roller 103 as a boundary.

  The sheet 31 is a back sheet provided in the bilayer body 30. The sheet 31 is peeled off from the laminate including the film 32 in the flow direction 61 with the roller 104 as a boundary. The sheet 31 is wound around the roller 105. The laminated body including the An catalyst 96 is conveyed to the metal heat roller 117 via the roller 107.

  A dummy sheet 112 coated with a cathode catalyst, hereinafter referred to as a Ca catalyst 111, is sent out along the flow direction 113. The Ca catalyst 111 is placed between the heat roller 116 and the heat roller 117 made of rubber on the surface of the film 32 to which the An catalyst 96 has been transferred opposite to the An catalyst 96.

  The An catalyst 96 is transferred to the film 32 by the heat roller 116 and the heat roller 117. The heat rollers 116 and 117 also function as transfer rollers. A laminated body having the Ca catalyst 111 is conveyed along the flow direction 114.

  When the rolls are continuously produced, the end of the two-layer body 30 of the old roll material that has been flowing in the apparatus and the starting end of the two-layer body 40 of the new roll material (not shown) are spliced in the region 90. The foil splicing operation is performed at the stage where the remaining of the old roll of the bilayer 30 flowing in the apparatus of FIG.

  At this time, the apparatus is stopped and the roll material is changed. The end of the old roll material and the start of the new roll material are joined with a tape. After the foil joining, the transfer to the electrolyte membrane is resumed at the second roll of the electrolyte membrane.

  The sheet 31 is peeled off from the laminate including the film 32 by the roller 104. In this embodiment, by performing foil splicing as described below, it is possible to join the end of the sheet 31 to the beginning of the next sheet so that the roller 104 does not cause poor peeling. Similarly, the end of the membrane 32 can be joined to the beginning of the next membrane.

[2. Foil splicing method]
As Example 1, the roll material is foil-joined. For example, the roll material includes a back sheet having a thickness of 100 μm and an electrolyte membrane having a thickness of 10 μm. As shown in FIG. 8, the starting end of the new roll material is cut into a V shape according to the cut lines 68 and 69 to form the starting end 75, and foil joining is performed according to the above embodiment. As shown in FIG. 9, each layer of the bilayer body 30 is peeled off at the end 35 on the old roll material side.

  Here, between the respective layers, the starting end 75 of the new roll material is connected to the old roll material with double-sided tapes 78 and 79. When V-cutting, a double-sided tape is previously applied to the beginning of the new roll material. As shown in FIG. 8, the tip 80 is cut along a cut line 65 in a direction substantially perpendicular to the flow direction.

  The adhesion of the cross section in the width direction between the sheet 71 and the film 72 of the two-layer body 70 is gradually increased by the V-cut. For this reason, in the separation of the foil joint portion or delamination between the layers by the roller 104, it is difficult to cause a separation failure.

  Further, in this embodiment, as shown in FIG. 11, the adhesive force or bonding force of the cross section in the width direction is set so that F1 and F3 are larger than F2. As a result, occurrence of defective peeling can be called. In addition, since the new roll material is not peeled off at the time of foil joining, air accumulation hardly occurs.

[3. Comparative Example 1]
As Comparative Example 1, as shown in FIG. 15, the film 42 is peeled off from the sheet 41 at the starting end 45 of the new roll material. The end 35 of the old roll material is overlaid on the sheet 41. A membrane 32 is placed over the end 35. As a result, the sheet 31 and the film 32 at the end 35 are sandwiched between the start end 45. Next, as shown in FIG. 16, the sheet 31 and the sheet 41 are connected with the tape 118. On the other side, the film 32 and the film 42 are connected with the tape 119.

  In FIG. 14, the method of Comparative Example 1 hardly causes the above-described peeling failure after passing through the roller 104. This is considered to be for peeling off the two-layered body of the new roll material from the inside. However, as shown in FIG. 16, the air reservoir 22 is more likely to be generated than the air in the gap 21 after passing through the heat rollers 101 and 102.

  Alternatively, in the process of passing through the heat rollers 101 and 102, bulging may occur as if a thread is pulled from the air reservoir. Since the air remaining between the layers is difficult to go outside, the bulge once generated continuously occurs. Also, it is difficult to completely expel air at the foil joint.

[4. Comparative Example 2]
Foil splice in the opposite direction to Comparative Example 1. Problem 2 above. It is the same as the method described in. That is, as shown in FIG. 4, the film 32 is peeled off from the sheet 31 at the end 35 of the old roll material. Next, double-sided tapes 48 and 49 are affixed to the starting end 45 of the new roll material. Next, the start end 45 is sandwiched and fixed to the end 35.

  In FIG. 14, the method of Comparative Example 2 hardly causes air accumulation after passing through the heat rollers 101 and 102. However, after passing through the roller 104, the above-described peeling failure tends to occur. Moreover, since how to apply the tape varies depending on the operator, this also tends to cause peeling failure.

  FIG. 17 shows a state in which the starting end 83 of the new roll material is uniformly narrowed toward one of the side portions. A cut line 84 indicates an end portion when cut only by the cut line 68 in FIG. Since air escapes to the upper side in the figure along the cut line 84, there is an effect of suppressing the occurrence of air accumulation.

  As shown in FIG. 18, the starting end 86 of the new roll material may be a V-shape in which a tip portion 87 that becomes a V-shaped valley extends in the flow direction. This foil splicing method shows an excellent inhibitory effect against air accumulation and separation failure as in Example 1.

[Comparative Example 3]
As shown in FIG. 19 as Comparative Example 3, when the starting end of the new roll material is inverted V-shaped, there is an effect of suppressing peeling failure. However, an air pool is likely to be generated in the concave portion 88 that becomes an inverted V-shaped valley.

[Comparative Example 4]
As shown in FIG. 20 as Comparative Example 4, when the starting end of the new roll material is M-shaped, there is an effect of suppressing peeling failure. However, an air pool is likely to occur in the concave portion 89 that is the top of the M-shape.

21 gap 22 air reservoir 23, 24 double layer 25 gap 26 air reservoir 27 film 28 gap 29 film 30 double layer 31 sheet 32 film 33, 34 peeling surface 35 end 36 intermediate part 40 double layer 41 sheet 42 film 43, 44 Outer surface 45 Starting end 46 Intermediate portion 48, 49 Double-sided tape 51, 52 Roller 54, 55 Rotating direction 57, 61, 62 Flow direction 63, 64 Adhesive surface 65, 68, 69 Cut line 70 Double layer 71 Sheet 72 Film 73 , 74 Outer surface 75 Start end 78, 79 Double-sided tape 80 End 81 Clearance 83 Start end 84 Cut line 86 Start end 87 End 88 Depression 89 Recess 90 Region 91, 92, 93 Flow direction 96 An catalyst 97 Dummy sheet 98 Remaining 100 Roll 101, 102 Heat roller 103-105, 107 Roller 111 Ca catalyst 112 Dummy Preparative 113,114 flowed direction 116, 117 heat roller 118 and 119 tape

Claims (8)

At the end of the old roll material made of a two-layer body, separating the two-layer body one by one and forming one and the other peeling surface;
A process of processing the starting end of the new roll material composed of the two-layered body into a shape in which the tip on the downstream side in the flow direction of the roll material is closed and the width becomes narrower toward the tip;
Bonding the one peeled surface to one outer surface of the bilayer body at the starting end;
Bonding the other release surface to the other outer surface of the bilayer body at the start end opposite to the one outer surface;
With
The bonding force per unit area of the one outer surface and the one peeling surface, and the other outer surface and the other peeling surface is the adhesion force per unit area between the layers of the bilayer body at the starting end. Bigger than,
Foil splicing method. The tip is joined to the one and the other release surface,
The foil splicing method according to claim 1. At the end of the old roll material made of a two-layer body, separating the two-layer body one by one and forming one and the other peeling surface;
At the beginning of the new roll material composed of two layers, a process of applying a double-sided tape to the outer surface of one and the other facing each other;
The step of processing the start end together with the double-sided tape into a shape in which the tip on the downstream side in the flow direction of the roll material is closed and the width becomes narrower toward the tip,
Bonding the opposite adhesive surface of the double-sided tape affixed to the one outer surface to the one peeling surface;
Bonding the opposite adhesive surface of the double-sided tape affixed to the other outer surface to the other release surface;
With
The bonding force per unit area of the double-sided tape is greater than the adhesion force per unit area between the layers of the bilayer body at the starting end,
Foil splicing method. It is a foil splicing method of a roll material consisting of two layers of different sheets and films,
At the end of the old roll material, peeling the film from the sheet and forming each peeled surface,
At the beginning of the new roll material, a step of applying a double-sided tape to the outer surface on the sheet side and the outer surface on the film side facing this,
The step of processing the start end together with the double-sided tape into a shape in which the tip on the downstream side in the flow direction of the roll material is closed and the width becomes narrower toward the tip,
Bonding the opposite adhesive surface of the double-sided tape affixed to the sheet to the release surface of the sheet;
Bonding the opposite adhesive surface of the double-sided tape affixed to the membrane to the release surface of the membrane;
With
The bonding force per unit area of the double-sided tape is larger than the adhesion force per unit area of the sheet and the film at the starting end,
Foil splicing method. The sheet is made of a resin thicker than the film,
The membrane is an electrolyte membrane;
The foil splicing method according to claim 4. At the tip, the two-layer body is processed into a shape closed together with the double-sided tape by a straight line or a plane substantially orthogonal to the flow direction.
The foil splicing method according to any one of claims 3 to 5. The shape is a shape that narrows from both sides of the roll material toward the center,
The foil splicing method according to any one of claims 1 to 6. The shape is substantially V-shaped,
The foil splicing method according to claim 1.

Images