JP2023136119A - Folding device for high-performance material film - Google Patents

Abstract

To provide a device capable of stably bending films or sheets made of various high-performance materials without leaving any internal stress.SOLUTION: Folding equipment for a high-performance material film that performs valley folding or mountain folding on a peripheral portion of a high-performance material film whose at least the surface is made of plastic, with a bend line set back by a predetermined distance from the leading edge of the peripheral portion, includes a first mold 5 and a second mold 6 that sandwich the peripheral portion in the thickness direction of the film and perform valley folding or mountain folding, and an impact force generator 11 is provided that applies an impact force to the peripheral portion sandwiched between the first mold 5 and the second mold 6 in at least one of the first mold 5 and the second mold 6.SELECTED DRAWING: Figure 3

Description

The present invention relates to a device for folding high-performance material films with excellent stretchability and light shielding properties, such as polyethylene films, polypropylene films, polyolefin films, and laminate films made by laminating these films with metal foils such as aluminum foil. In particular, it relates to a device that performs a bending process called hemming bending (hemi-bending), bruising folding, crushing bending, etc., in which two sheets are folded one on top of the other.

As an example of this type of high-performance material film, a laminate film in which aluminum foil and plastic are laminated is known, and an example in which a container for accommodating a lithium ion secondary battery is constructed using the laminate film is described in Patent Document 1. has been done. The laminate plate described in Patent Document 1 is made by laminating plastic layers on both sides of a thin aluminum plate, and encloses the secondary battery in an airtight state, and the upper and lower laminate plates are overlapped at the joints around the secondary battery. They are in close contact with each other. In order to fold the joining part in half, in the method described in Patent Document 1, first, the part along the side of the workpiece is pushed down, and the tip side of the pushed down part is received with a lower mold, etc., and by doing this, the workpiece is The part along the line is bent into a V-shape as a base point, and then the part of the joining part that extends obliquely upward is pushed from the side toward the workpiece, and the part at the base point is further bent at an acute angle.

Japanese Patent Application Publication No. 2002-331309

In the bending method described in Patent Document 1 mentioned above, warm working is performed in order to prevent damage at the bending base point during bending. The temperature is 100°C to 110°C, and the processing time is about 5 seconds. Heating the laminate plate softens the aluminum thin plate and promotes the misalignment of molecules in the plastic layer covering it, making it easier to bend. However, not only does it take time to heat up, but it also takes time to dissipate the heat to return to room temperature, which ultimately lengthens the overall bending process. It is difficult to do so. Furthermore, since thermal energy is consumed for heating, there is a factor that increases the environmental load such as greenhouse gas emissions, and it is desired to improve this point.

Note that if the workpiece (material) is not heated or raised in temperature during bending, the residual stress (internal stress) associated with bending will increase and springback will occur, and the amount of springback will not necessarily be uniform. There is a possibility that the ridge line (edge portion) caused by bending becomes wavy, resulting in a defective product. Furthermore, if the plastic layer on the front side, which has been largely stretched by bending, changes or deteriorates over time, cracks or breaks may occur due to stress generated during bending. As described in Patent Document 1, if a secondary battery is housed, electrolyte may leak from cracks or ruptures, which may lead to explosion or combustion of the secondary battery. It may cause.

This invention has been made with a focus on the above-mentioned technical problem, and is intended to produce films or sheets made of various high-performance materials, including the above-mentioned laminate film or sheet, without leaving any internal stress. The object is to provide a device that can be stably bent.

In order to achieve the above-mentioned object, the present invention forms a periphery of a high-performance material film whose surface is at least made of plastic, with a valley fold or a crest formed at a bending line that is set back by a predetermined distance from the tip edge of the periphery. A folding device for a high-performance material film to be folded, comprising a first mold and a second mold that sandwich the peripheral portion in the thickness direction of the film to perform the valley fold or mountain fold, an impact force that applies an impact force to at least one of the first mold and the second mold to the peripheral portion sandwiched between the first mold and the second mold; It is characterized by being equipped with a generator.

In this invention, the impact force generator applies impact force to pressurize the peripheral portion for a predetermined time, and to pressurize the peripheral portion for the predetermined time after a predetermined time interval. It may be configured to repeatedly perform the application operation.

In this invention, the high-performance material film includes a film in which a metal film and a plastic film are laminated, and the valley fold or mountain fold may be a bend in which the plastic film is on the outside.

In this invention, the first mold is provided with a recess into which the bending line in the peripheral part is pushed, and the second mold is provided with a recess into which the bending line in the peripheral part is pushed. A protrusion is provided to press the portion toward the inside of the recess, and the impact force is applied at least to a portion of the bending line that is sandwiched between the recess and the protrusion. It's good that it has been done.

In this invention, the first mold and the second mold are a first mold for a first step and a second mold for a first step that bend the peripheral portion to an angle greater than 90°. , comprising a first mold for a second step and a second mold for a second step, which bend the portion bent to an angle greater than 90° until the peripheral portion is folded in half overlapping each other, and the impact force is generated. The machine molds at least one of the first mold for the first step, the second mold for the first step, the first mold for the second step, and the second mold for the second step. It may be provided in the mold.

In this invention, by sandwiching the periphery of the high-performance material film between the first mold and the second mold, the periphery of the film is bent according to the shape of the molds. With the molds sandwiching and pressurizing the peripheral portion, the impact force generated by the impact force generator is applied to at least the bending line of the peripheral portion. As a result, the residual stress (internal stress) at the bending line, that is, the location where bending occurs, is reduced, and the amount of springback after bending is reduced. In addition, since the residual stress at each part on the bending line is equalized, the ridge line caused by bending or the edge of the bent part becomes a straight line parallel to the bending line, so that the bending process can be performed as intended. becomes possible. Furthermore, since the residual stress associated with bending is reduced, defects such as cracks and breaks due to changes over time can be prevented even when the surface layer is a plastic layer, for example.

FIG. 1 is a schematic perspective view showing an example of a packaging film to be processed in the present invention. It is a sectional view of the peripheral part for explaining the procedure of folding the peripheral part of the packaging film. 1 is a diagram schematically showing an example of an apparatus according to the present invention, and is a schematic diagram showing a configuration for performing a first step. FIG. It is a figure which shows typically an example of the apparatus based on this invention, Comprising: It is a schematic diagram which shows the shaping|molding die for performing a 2nd process. It is a figure which shows typically an example of the apparatus based on this invention, Comprising: It is a schematic diagram which shows the shaping|molding die for performing a 3rd process.

The present invention will be described with reference to embodiments shown in the drawings. Note that the embodiments listed below are merely examples of implementing this invention, and do not limit this invention.

The device according to the present invention is a device for folding the peripheral portion of a high-performance material film in half. The high-performance material films that are processed are films made of polyethylene, polypropylene, polyolefin, etc., films made of composites of at least two types of plastics, and even laminated metal films and plastic films to provide gas barrier properties. Such as laminated film. In addition, the peripheral part of the high-performance material film is, for example, a part that is assembled to close the opening of a bag-shaped high-performance material film, and is therefore a peripheral part that covers the entire circumference of the high-performance material film. Alternatively, it may be only the closing margin on one side that is an opening. Furthermore, the folding in this invention involves valley-folding or mountain-folding a flat high-performance material film along a predetermined folding line, and especially in the case of the above-mentioned laminate film, the plastic film is on the outside. It is bending. The bending angle is not particularly limited, but since the load applied to the bending point is the most severe in so-called double-folding (bending with a bending angle of 180°), the device according to the present invention can handle such double-folding. This is particularly effective when Note that bi-folding is a type of bending that is called hemming bending (hemi-bending), bruising bending, or crushing bending in the technical field of metal processing. This is a form of bending that causes

FIG. 1 is a partial view schematically showing a highly functional material film (hereinafter referred to as packaging film) 1 as an example of an object to be bent in the present invention. It is a laminate film with a thickness of, for example, 0.32 m, which is made by sandwiching an aluminum film (aluminum film) between the front and back sides of plastic films such as polyethylene. It houses the battery 2. At the opening of the packaging film 1, the laminate films are brought together and welded to seal the secondary battery 2. The closed portions that are welded to each other are the closing margin portions 3 which are the portions to be bent in the present invention. This closing margin part 3 corresponds to the peripheral part in this invention, and since this closing margin part 3 is plate-shaped and protrudes laterally, it is necessary to prevent it from getting in the way during handling, stacking, etc. , also fold to save space. Further, in order to ensure an airtight state, the folding is performed in half, such as a hemi-fold as described above.

2(a) to 2(d) are schematic cross-sectional views showing the folding procedure. First, as shown in FIG. 2), bend the part from the proximal end to the distal end side diagonally downward, and also fold the part that is set back by a predetermined distance from the distal edge part of the closing margin part 3, that is, approximately the center part in the width direction. Valley fold as bend line 4. In that case, it is bent so that the portion on the tip side from the bending line 4 faces in the vertical direction, that is, so that it is approximately perpendicular to the closing margin 3 (i.e., the horizontal plane) before bending. This is to make the angle between the portions on both sides of the bending line 4, that is, the distal end portion 3A and the proximal end portion 3B, an acute angle of less than 90°. In other words, the bending angle is 90° or more.

Then, as shown in FIG. 2B, the portion including the proximal end portion 3B from the proximal end of the closing margin 3 to the bending line 4 is bent horizontally or slightly upwardly diagonally. In this state, the distal end portion 3A is at an acute angle with respect to the proximal end portion 3B, so the distal end portion 3A is tilted toward the horizontal plane. Therefore, by simply crushing the distal end portion 3A from the upper side toward the proximal end portion 3B, the distal end portion 3A is overlapped with the proximal end portion 3B and folded in half, as shown in FIG. 2(c). be done. That is, it is so-called hemi-folded.

Push up the hemi-folded portion from below and bend it upward as shown in FIG. 2(d). This is because the overall shape of the secondary battery 2 packaged with the packaging film 1 follows the contour of the secondary battery 2.

Next, the apparatus according to the present invention that performs the bending process shown in FIG. 2 will be described. FIG. The apparatus used is schematically shown. As shown in FIG. 3, a lower punch 5 and an upper punch 6 are provided for shaping the closing margin 3 into the shape shown in FIG. 2(a), and the upper surface (processed surface) of the lower punch 5 is provided. is the width that covers the portion of the closing margin 3 from the base end to the vicinity of the bending line 4, and the portion corresponding to the bending line 4 has a cross-sectional shape with a center angle θo of approximately 120°. The recessed portion (dented portion) 5A is shaped like an arc. In addition, of the processed surface, the end opposite to the recess 5A in the width direction of the lower punch 5, that is, a portion corresponding to a part of the proximal end of the closing margin 3 is a narrow flat surface. This portion serves as a receiving surface 5B on which the closing margin portion 3 is placed and fixed. A portion between the recess 5A and the receiving surface 5B is an inclined surface 5C that smoothly descends from the receiving surface 5B toward the recess 5A. This inclined surface 5C is the surface on which the proximal end portion 3B shown in FIG. 2(a) is processed.

An upper bending punch 7 that contacts the side surface of the lower punch 5 and moves up and down is provided on the side of the recess 5A. This upper bending punch 7 is a punch that performs a bending process to push up the closing margin portion 3 (the tip side portion 3A shown in FIG. 2(a)) protruding from the lower punch 5 at the upper end corner, and is approximately perpendicular. The upper surface forming the upper end corner is a substantially flat surface.

The upper punch 6 is configured to sandwich the closing margin 3, which is the workpiece, between the inclined surface 5C and the recess 5A of the lower punch 5, and bend it into the shape shown in FIG. 2(a). has been done. That is, the processing surface, which is the lower surface of the upper punch 6, is formed by an inclined surface 6A that is symmetrical to the inclined surface 5C of the lower punch 5, and a protrusion 6B that is symmetrical to the recess 5A and protrudes toward the recess 5A. It is configured. Further, a material presser 8 that moves up and down toward the receiving surface 5B of the lower punch 5 is arranged adjacent to the upper punch 6 and so as to move up and down together with the upper punch 6.

To explain the mechanism for raising and lowering the lower punch 5, a lifter 9 is arranged below the lower punch 5. The lifter 9 is a mechanism that raises and lowers the lower punch 5 and receives a bending load, and is mainly composed of an appropriate actuator. For example, a cam mechanism that rotates around a horizontal center axis and a cam follower that is pushed up and down by the cam's guide groove or outer peripheral surface, or a toggle jack that mainly uses a toggle mechanism. The lifter 9 can be configured by an appropriate mechanism such as a hydraulic cylinder or the like.

A holder 10 is provided above the lifter 9 and is moved vertically by the lifter 9. An impact force generator 11 is attached on top of the holder 10, and the lower punch 5 is attached to the movable part of the impact force generator 11. Therefore, the lower punch 5 is configured to be raised and lowered together with the holder 10 and the impact force generator 11 by the lifter 9.

The impact force generator 11 is for applying an impact force to the closing margin 3 sandwiched between the lower punch 5 and the upper punch 6 in the sandwiching direction. It is mainly composed of a piezoelectric element (piezoelectric element), etc., and is configured to electrically deform and generate pressing force. In short, the impact force generator 11 only needs to be configured so that it can repeatedly apply pressing force to the workpiece in a short period of time. In the above-mentioned bending process, the pressing force (impact force) is mainly applied to the location along the bending line 4 or in the vicinity, and the magnitude of the pressing force depends on the rigidity and material of the workpiece. It can be determined experimentally depending on the situation. For example, if the configuration uses a magnetostrictive element, the pressing force (impact force) can be adjusted by voltage. Further, the impact force may be applied simply repeatedly, or it may be a cycle in which the pressure force is maintained for a predetermined period of time, and then applied again after a predetermined interval. In that case, the pressurization maintenance time can be, for example, about 20 ms (milliseconds), and the interval can be, for example, about 10 ms. Furthermore, the time for repeatedly applying the impact force may be about 3 seconds (seconds).

On the other hand, the upper bending punch 7 disposed adjacent to the lower punch 5 is attached to a holder 13 that is raised and lowered by a lifter 12. Since the upper bending punch 7 moves up and down at different timings than the lower punch 5, the lifter 12 may be provided separately from the lifter 9 for the lower punch 5. Alternatively, if the lifter 9 for the lower punch 5 is configured with a cam mechanism, for example, if a cam profile for the upper bending punch 7 is provided, which is different from the cam profile for the lower punch 5, the lower punch 5 The lifter 9 can be used as a lifter for the upper bending punch 7.

The upper punch 6 is attached to the lower surface of a holder 15 suspended by a pusher 14. The pusher 14 is a mechanism for pushing down the upper punch 6 toward the lower punch 5, and is mainly composed of an actuator such as a servo motor or a hydraulic cylinder. The material presser 8 is attached to the holder 15 similarly to the upper punch 6. Note that the material presser 8 may be configured to move up and down independently of the upper punch 6, and in that case, the material presser 8 may be attached to the lower surface of a holder suspended by an appropriate pusher (not shown). Further, the material presser 8 may be attached to the holder 15 for the upper punch 6 via an elastic member (not shown) such as a spring. That is, the material presser 8 is used to press and fix the closing margin 3 against the receiving surface 5B of the lower punch 5 before and after the bending process, so it is used before and after the upper punch 6. The closing margin 3 can be fixed by lowering and pressing the closing margin 3 and further lowering the upper punch 6 while compressing the elastic member. Furthermore, when the upper punch 6 is raised, the material presser foot 8 is pushed toward the lower punch 5 by the elastic member until the elastic member is stretched by a specified dimension, so that the closing margin 3 can be maintained in a fixed state. .

FIG. 4 schematically shows a mold for performing the bending process shown in FIGS. 2(b) to 2(c) described above. This mold is a mold that performs a so-called second process, whereas each punch shown in FIG. 3 performs a so-called first process, and includes a lower punch 21, an upper punch 22, and a material presser 23. ing. The lower punch 21 includes an inclined surface 21A that pushes up the proximal end portion 3B shown in FIG. There is. Further, the upper punch 22 presses and bends the tip side portion 3A in the so-called open state shown in FIG. It has an inclined surface 22A parallel to the inclined surface 21A in . The inclined surface 22A is a surface having a length (width) that presses a portion of the distal end portion 3A that is a predetermined distance from the bending line 4 on the distal end side. Note that the portion of the inclined surface 22A that faces the vicinity of the bending line 4 is recessed upward and is a curved surface having an arcuate cross-sectional shape. That is, the so-called bent portion, which is the boundary between the proximal end portion 3B and the distal end portion 3A, has a predetermined radius (for example, an outer diameter (radius) of 400 μm, an inner diameter (radius) of 100 μm), and if this portion is crushed to make it flat, it will crack or break. Therefore, in order to maintain the curved shape with a predetermined radius, a concave portion 22B that is recessed in an arc shape is formed on the upper side. Note that if the outer radius of the recess 22B is 600 μm or more, no harshness will occur, and defects such as cracks and breaks can be avoided.

The material presser 23 is arranged above the receiving surface 21B of the lower punch 21 so as to be movable up and down. The lower end surface (tip surface) of the material presser 23 is a presser surface, which has substantially the same shape as the receiving surface 21B of the lower punch 21 and faces each other. Therefore, by raising the lower punch 21 to the lower surface of the closing margin 3 and lowering the material presser 23 toward the lower punch 21, the proximal end of the closing margin 3 is moved to the receiving surface 21B of the lower punch 21. The closing margin portion 3 is fixed by being sandwiched between the material presser 23 and the material presser 23.

Note that the mechanism for raising and lowering each punch 21, 22 and material presser 23 shown in FIG. 4 may be the same as the mechanism shown in FIG. 3, or may have the same structure as various mechanisms conventionally used in press machines. It may be. Furthermore, even in the mold shown in FIG. 4 in which bending is performed as the so-called second step, the vicinity of the bending line 4 is pressurized, so the above-mentioned impact force generator may be provided on the lower punch 21 or the upper punch 22. .

FIG. 5 schematically shows a mold for bending the already folded portion into the shape shown in FIG. 2(d). This mold is a mold for performing a so-called third step, and includes a material receiver 31, a material presser 32, and an upper bending punch 33. The material receiver 31 is a mold for supporting the proximal end portion of the closing portion 3 from below, and its receiving surface (upper end surface) is arranged on the right side in FIG. 5 to facilitate upward bending. is slanted so that it is on the upper side. On the other hand, the lower end (tip end) of the material presser 32 has a pointed shape so as to press the base end of the closing margin 3 against the approximate center of the upper end surface of the material receiver 31 in the width direction. There is.

The upper bending punch 33 is arranged to move up and down along the side surface of the material receiver 31, and its upper surface (processing surface) is on the lower surface of the base end portion 3B that is inclined with respect to the horizontal plane. They are tilted to face each other. That is, at the beginning of the process of further bending the so-called two-folded portion upward, the purpose is to push up the lower surface of the aforementioned proximal end portion 3B with a surface that contacts almost the entire portion thereof.

Note that the mechanism for raising and lowering each of the molds shown in FIG. 5 may be a mechanism configured as shown in FIG. 3 or a conventionally known mechanism.

In addition, each punch, material presser, etc. shown in FIGS. 3 to 5 are measured in the direction of the bending line 4 in the closing margin 3 in order to make surface contact with the closing margin 3 where the bending process is performed. It has a length that is equal to or longer than the dimension.

The bending process in the first to third steps described above will be explained next. First, the closing margin 3, which is the workpiece, is set almost horizontally between the lower punch 5 and the upper punch 6 shown in FIG. raise. In this state, the receiving surface 5B of the lower punch 5 is in contact with the lower surface of the base end portion of the closing margin portion 3. Next, when the upper punch 6 is lowered by the pusher 14, the protrusion 6B comes into contact with the upper surface of the closing margin 3 and pushes it down, and at the same time pushes the bending line 4 into the recess 5A of the lower punch 5. At the same time, the base end portion 3B is bent diagonally downward with respect to the horizontal plane. As a result, it is valley-folded at the bending line 4, and the tip end portion 3A is bent horizontally or slightly upward.

The closing margin 3 is sandwiched between the lower punch 5 and the upper punch 6, and in particular, the projection 6B of the upper punch 6 pushes the bending line 4 of the closing margin 3 into the recess 5A of the lower punch 5. In this state, the impact force generator 11 generates an impact force. As a result, a state similar to that of repeated bending loads occurs in the area along the bending line 4, and the entire area along the bending line 4 is affected by the lower punch 5 and the upper punch 6. It adapts to the machined surface and is bent into the same shape as the machined surface. As mentioned above, the impact force is applied by maintaining the applied impact force for a predetermined period of time (e.g. 20 ms), and then applying the impact force again at a predetermined interval (e.g. 10 ms) and maintaining it. Such maintenance and intervals are repeated multiple times or for a predetermined period of time (for example, 3 seconds).

Thereafter, by lifting the upper bending punch 7 after stopping the application of the impact force, the tip side portion 3A protruding from between the lower punch 5 and the upper punch 6 is bent upward by the upper bending punch 7. This bending is essentially a bending process using the upper punch 6 and the upper bending punch 7, and the tip end portion 3A is bent upward along the side surface of the upper punch 6.

After performing the so-called first step of bending in this manner, the upper punch 6 and material presser 8 are raised, and the upper bending punch 7 and lower punch 5 are lowered to release the closing margin 3, and then as shown in FIG. It is set in the so-called second-step mold shown in FIG. In this mold, the material presser 23 is lowered and its tip defines the vertical position of the proximal end of the closing margin 3, and in this state, the lower punch 21 is raised to move the closing margin. Push up the tip side portion 3A at 3 and bend it diagonally upward. At the same time, the receiving surface 21B of the lower punch 21 comes into contact with the lower surface of the closing margin 3, and its base end is sandwiched and fixed between the material presser 23 and the receiving surface 21B of the lower punch 21. In this state, the distal end portion 3A somewhat covers the proximal end portion 3B. Therefore, by lowering the upper punch 22 in this state, the tip end portion 3A is further bent by the inclined surface 22A so as to be flush with the base end portion 3B. In other words, it is hemi-folded. In this case, since the portion along the bending line 4 is located inside the recess 22B having an arcuate cross section formed in the upper punch 22, a curved state with a predetermined radius of curvature is maintained. The shape thus bent is as shown in FIG. 2(c) above.

Then, the closing margin portion 3 that has been hemi-folded is set in a mold for the so-called third step shown in FIG. In this third step, the base end portion of the closing margin portion 3 is sandwiched and fixed from above and below by the material receiver 31 and the material presser 32. In this state, the hemi-folded portion protrudes above the upper bending punch 33, and as the upper bending punch 33 rises, the hemi-folded portion is bent upward. The shape after bending is shown in FIG. 2(d).

As described above, in the folding device according to the present invention, when the closing margin 3 of the packaging film 1 is sandwiched between the lower punch 5 and the upper punch 6 and valley-folded, the lower punch 5 and the upper punch 6 Since the above-mentioned impact force is applied while the closing margin 3 is being sandwiched between the edges, the entire area along the bending line 4 is accurately or closely contacted with the machined surfaces of the lower punch 5 and the upper punch 6. It is then bent into a shape that is copied. As a result, the so-called edge portion along the bending line 4 after bending and the entire tip end portion 3A can be formed into a straight line or a flat surface.

The inventors of this invention conducted an experiment and found that when bending was performed without applying impact force, the so-called edges along the bending line 4 were bent in a wavy manner. Occurred. In addition, the angle between the distal end portion 3A and the proximal end portion 3B is different at multiple locations along the bending line 4, and as a result, the distal end portion 3A is wavy in the direction along the bending line 4. , or a plurality of cases where the edge of the distal end portion 3A was wavy. This is thought to be because the degree of bending differs from part to part, resulting in variations in springback. On the other hand, when bending is performed by applying the above-mentioned impact force, the so-called edge portion along the bending line 4 maintains the straight shape as expected, and the tip side portion 3A maintained a flat plate shape, and its edges also maintained a straight shape. Furthermore, the angle between the distal end portion 3A and the proximal end portion 3B is smaller when bending is performed with impact force applied than when no impact force is applied; It was observed that springback was small by applying impact force. Overall, it was confirmed that defect-free bending can be performed by applying impact force.

It is not necessarily clear why the application of the aforementioned impact force achieves the above effects and effects, but the application of impact force causes material flow, changes in molecular orientation, shifts at crystal interfaces, etc. This is thought to be due to the fact that residual stress due to bending is eliminated or reduced accordingly. These factors can reduce or eliminate the residual stress at the bending line 4, so in the case of packaging film 1 with a plastic layer as the outer layer, even if the plastic layer changes or deteriorates over time, the folding It is possible to avoid or suppress the occurrence of cracks or breaks at the bending portion. In particular, when lithium ion secondary batteries are packaged, accidents such as electrolyte leakage due to changes over time can be avoided or suppressed.

Note that the present invention is not limited to the embodiments described above, and the impact force generator may be provided in at least one of the upper punch and the lower punch. Further, the mold provided with the impact force generator is not limited to the mold used in the so-called first step described above, but may be provided in the mold used in the so-called second step. Therefore, any one of the lower punch 5 and the upper punch 6 shown in FIG. 3, and the lower punch 21 and the upper punch 22 shown in FIG. This corresponds to the second mold. Further, one of the lower punch 5 and the upper punch 6 shown in FIG. 3 corresponds to the first mold for the first step in the present invention, and the other corresponds to the second mold for the first step. Either one of the lower punch 21 and the upper punch 22 shown in FIG. 4 corresponds to the first mold for the second step in this invention, and the other corresponds to the second mold for the second step. Further, in the above-described embodiment, an example is shown in which valley folding is performed in the so-called first step, but in the present invention, mountain folding may be performed instead of valley folding. Furthermore, the bending in the present invention may essentially be a so-called hemi-fold or the like, and the bending procedure is not limited to the procedure shown in FIG. 2 described above. The high-performance material film that is the object of bending in this invention may be a film other than a packaging film for accommodating a secondary battery, and may be a film that forms a part or surface of some structural material. It may be.

1 Packaging film 2 Secondary battery 3 Closing margin (periphery)
3A Tip side part 3B Base end side part 4 Bending line 5 Lower punch 5A Recessed part 5B Receiving surface 5C Inclined surface 6 Upper punch 6A Inclined surface 6B Projection 7 Punch 8 Material presser 9 Lifter 10 Holder 11 Impact generator 12 Lifter 13 Holder 14 Pusher 15 Holder 21 Lower punch 21A Inclined surface 21B Receiving surface 22 Upper punch 22A Inclined surface 22B Recess 23 Material presser 31 Material receiver 32 Material presser 33 Punch

Claims (5)

A folding device for a high-performance material film, which folds a peripheral portion of a high-performance material film having at least a surface made of plastic, with a bending line set at a point set back by a predetermined distance from a leading edge portion of the peripheral portion. ,
comprising a first mold and a second mold that sandwich the peripheral portion in the thickness direction of the film and perform the valley fold or mountain fold;
an impact force that applies an impact force to at least one of the first mold and the second mold to the peripheral portion sandwiched between the first mold and the second mold; A highly functional material film folding device characterized by being equipped with a generator. A folding device for a high-performance material film according to claim 1,
The impact force generator repeatedly applies an impact force that pressurizes the peripheral portion for a predetermined time, and applies impact force that pressurizes the peripheral portion for the predetermined time after a predetermined time interval. A high-performance material film folding device characterized in that the folding device is configured to fold a high-performance material film. A folding device for a high-performance material film according to claim 1 or 2,
The high-performance material film includes a laminated film of a metal film and a plastic film, and the valley fold or mountain fold is a bending with the plastic film on the outside. Device. A high-performance material film folding device according to any one of claims 1 to 3,
The first mold is provided with a recessed portion into which a portion of the bending line of the peripheral portion is pushed;
The second mold is provided with a protrusion that presses the bending line in the peripheral portion toward the inside of the recess,
A folding device for a high-performance material film, characterized in that the impact force is applied to at least a portion of the bending line sandwiched between the recess and the protrusion. A high-performance material film folding device according to any one of claims 1 to 3,
The first mold and the second mold are a first mold for the first step and a second mold for the first step that bend the peripheral portion to an angle greater than 90°, and a second mold for the first step that bends the peripheral portion to an angle greater than 90°. A first mold for a second step and a second mold for a second step, which bend the portion bent to a large angle until the peripheral portion is folded in two overlapping each other;
The impact force generator includes at least one of the first mold for the first step, the second mold for the first step, the first mold for the second step, and the second mold for the second step. A folding device for a high-performance material film, characterized in that it is provided in one mold.

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