JP2017001237A - Half-size folder of bubble sheet, and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a half-size folder of a bubble sheet that stably folds a bubble sheet in half.SOLUTION: A half-size folder 2 of a bubble sheet 1 comprises: a triangular plate 20 having a triangular tabular body, which has a plate body attached to the bubble sheet and a corner part protruding in a thickness direction of the bubble sheet on an edge part where the bubble sheet is folded on the plate body, at a place where the bubble sheet fed in a state of facing a lateral direction is to be folded at a predetermined angle, and which forms a folding line on the bubble sheet contacting the corner part; a presser plate 25 having a tabular body, which is configured to be attached to/separated from the triangular plate, and which is arranged opposite to the plate body so that the bubble sheet can be held between the plate body and the triangular plate; and magnetic pressing means 5 which presses and energizes the presser plate toward the plate body using magnetism.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a half-folding apparatus for continuously folding a bubble sheet, which is a long object, into two in order to constitute a bag making machine that manufactures a bag body from the bubble sheet.

  Conventionally, in a bag making machine that manufactures a bag having an open side, a folded portion is formed at the bottom portion of the bag in the sheet-like member (raw fabric sheet) and then folded in two, and then the portions that are the opposite ends of the bag are joined. And it is set as a bag shape and cut | disconnected from a sheet-like member.

  At this time, in the step of folding the sheet-like member in half, when the sheet-like member is sent downstream in the sheet flow direction, the sheet-like member is brought into contact with the corner of the triangular plate in the vicinity of the center in the width direction. In general, a crease is formed along the length direction of the member (see, for example, Patent Document 1). More specifically, the raw sheet is usually wound around the vertical axis so that the occupied area at the manufacturing site does not increase even if the width dimension increases. The original sheet is fed in the vertical direction while being fed in the horizontal direction, and is folded back at a predetermined angle in plan view while contacting the triangular plate facing in the vertical direction, thereby forming a fold in the sheet passing through the triangular plate. The

  After that, the sheet on which the crease is formed is formed with a so-called seal line that is intermittently heat-sealed in a direction perpendicular to the crease, and is cut at the position of the seal line, so that the bottom edge of the crease is formed. Then, the bag body in which the opening is formed in the edge portion that opposes the seal line on the side edge and the bottom edge is completed.

JP 2010-1588879 A

  Here, in the bag making machine, since it is necessary to temporarily stop the original sheet at the timing of heat-sealing, the original sheet is sent out intermittently. For this reason, it may happen that the original sheet facing in the vertical direction is shifted downward when it is stopped. If such a deviation of the original sheet occurs on the upstream side of the triangular plate, there is a problem that the position of the fold formed by the corner of the triangular plate is shifted in the width direction of the original sheet. Of course, such a problem can be corrected promptly, but the operator must operate the bag making machine while being aware of such a crease shift, leading to an unnecessary increase in labor. In addition, when the misalignment is corrected, it is necessary to discard the bubble sheet of a certain length because the position adjustment of the fold is essential when the bag making machine is restarted.

  And the said problem is notable easily in the bubble sheet which has the structure which has a large unevenness | corrugation on the surface unlike the sheet | seat which makes a flat shape of a single layer form. Here, regarding the mode of the bubble sheet, even a so-called two-layered bubble sheet composed of a cap film and a back film has a so-called three-layer structure in which a liner film is further attached to the top surface of the bubbles formed by the cap film. The above problem appears in the same manner even in the case of the bubble sheet. In particular, when the cell is folded in half with the air bubble inside, the air bubble sheet passes through the top surface of the air bubble directly or indirectly while directly hitting the folded portion of the triangular plate. Irregular stress acts greatly, and such downward “displacement” tends to occur more easily. In particular, in the case of a two-layered bubble sheet in which the top surface of the bubble is in direct contact with the triangular plate, the above tendency is most remarkable.

  An object of this invention is to make it possible to fold a sheet-like member stably in the half-folding apparatus which folds the bubble sheet which is a sheet-like member in two in view of the said point.

  In order to achieve such an object, the present invention takes the following measures.

  That is, the bubble sheet half-folding device according to the present invention includes a plate body attached to the bubble sheet at a position where the bubble sheet sent out in a lateral direction is folded at a predetermined angle, and the plate body A triangular plate that is a triangular plate-like body that has a corner protruding toward the thickness direction of the bubble sheet at the edge where the bubble sheet is folded and forms a fold line on the bubble sheet in contact with the corner, and A pressing plate that is a plate-like body that is configured so as to be able to contact with and separate from the triangular plate and that can be sandwiched between the plate body and the plate surface so as to face the plate surface, and the pressing plate Magnetic pressing means for pressing and urging the plate body by magnetism.

  Moreover, the air bubble sheet half-folded product which concerns on this invention was manufactured with the said half-folding apparatus of the foam sheet, It is characterized by the above-mentioned. Here, the air bubble sheet half-folded product is not limited to a mode in which the air bubble sheet is simply folded, and widely includes modes in which heat sealing processing is appropriately performed, cut, or other processing is performed. It is a concept.

  And the manufacturing method of the air bubble sheet half-folded product according to the present invention includes an air bubble sheet sending step for sending the air bubble sheet in a lateral direction, and a triangular plate that forms the triangular shape of the sent air bubble sheet. And a magnetic energization for pressing and holding the air bubble sheet between the pressure plate and the triangular plate by urging the pressure plate to the triangular plate by a magnetic force. Folding the air bubble sheet in close contact with the triangular plate by the magnetic energizing step to the air bubble sheet in contact with the corner portion by sending it in a direction of folding while contacting the corner portion provided at the tip of the triangular plate. A fold line forming step for forming a bubble sheet, and a bubble sheet half-folded product by half-folding the bubble sheet at the position of the fold line formed by the fold line forming step. Characterized by a step.

  Here, the “triangular shape” of the triangular plate means that not only the form in which the whole forms a triangular shape but also the portion in contact with the bubble sheet has a substantially triangular shape.

  And this invention is made | formed by paying attention to the point that a press plate can be applied unlike other single layer sheet | seats only because this inventor is a bubble sheet. That is, since the surface is not flat if it is a bubble sheet, it has a concavo-convex shape formed directly or indirectly by bubbles, so that the present invention is realized for the first time by paying attention to the fact that excessive frictional force is not applied even if pressed. It was done. If the pressing by the pressing plate is applied to a single-layer sheet, the surface is scratched or excessive tension is generated, leading to sheet feeding failure and unnecessary deformation of the sheet, leading to a significant deterioration in quality.

  In such a case, when the crease is formed in the bubble sheet, the bubble sheet sandwiched between the triangular plate and the holding plate is further pressed by the magnetic force, so even when the supply of the bubble sheet is stopped. The bubble sheet is maintained in a state that is difficult to shift downward. Then, the folding line is formed while maintaining the state in which the displacement is difficult. Moreover, since tension is applied to the bubble sheet passing through the corners due to the frictional force generated by the pressing of the magnetic pressing means even during the bubble sheet sending operation, the deviation caused by the irregularities of the bubble sheet is also eliminated. .

  In particular, in the present invention, by selecting magnetic force as means for urging the pressing plate, the above effect can be stably obtained without damaging the bubbles even when widely applied to existing bubble sheets having various thicknesses. it can. In other words, the larger the size of the bubble, the easier it is to be crushed by pressing, and by adopting the pressing by magnetic force, the size of the bubble, in other words, the thickness of the bubble sheet, that is, the triangular plate and pressing plate at the time of pressing, The urging force by the magnetic force becomes weaker in proportion to the distance of. As a result, compared to mechanical elastic biasing and pressing using gravity, etc., in which the pressing force does not change regardless of the distance between the triangular plate and the pressing plate, it is damaged when the bubble is large without changing any specifications. This can be effectively avoided. As a result, the bubble sheet can be stably folded in two.

  As an aspect in which the present invention can be easily introduced to existing equipment, a magnetic pressing means is provided on either one of a triangular plate or a pressing plate, and a magnetic body that can be attracted to a magnet, and a magnet provided on the other The aspect which has can be mentioned. Here, the “magnetic body” is a concept that mainly indicates a ferromagnetic body that can be attracted to a magnet. That is, examples of the material include iron, nickel, and cobalt.

  Moreover, as an aspect which can implement | achieve the said effect by a simpler structure, the magnetic body is integrally provided in any one of the triangular plate or the pressing board. Specifically, the aspect etc. which comprise a triangular plate with a steel plate can be mentioned.

  And if it is the aspect which attaches a magnet to the back surface side which does not contact a bubble sheet in either the triangular plate or the pressing plate, it can be easily introduced into existing equipment. Here, the “magnet” includes, of course, a permanent magnet, but does not hinder the application of an electromagnet that generates a magnetic force when a current is applied.

  Moreover, as another aspect for constituting the magnetic pressing means, the magnetic pressing means may be composed of magnets respectively provided on the triangular plate and the pressing plate. At this time, it goes without saying that there are modes in which the triangular plate and the pressing plate themselves are configured by magnets, and the triangular plate and the pressing plate are configured by non-magnetic materials, and separate magnets are attached thereto.

  And as a structure which can be made to contact / separate a press plate correctly with respect to a triangular plate, the structure which a press plate can move to the triangular plate by operating so that rotation is possible around the axis extended in the lengthwise direction. Can be mentioned.

  In addition, as an aspect that can suitably cope with the change in the width dimension of the bubble sheet and the position where the folding line is provided, the pressing plate is provided so that the position in the vertical direction can be adjusted along the axis extending in the vertical direction. Can be mentioned.

  And, in order to achieve both the smooth feeding of the bubble sheet and the reliable pressing by the pressing plate and the magnetic pressing means so as to form the fold line smoothly, the triangular plate can be rotated along the axis extending in the vertical direction. It is desirable to be able to move relative to the holding plate by operating.

  ADVANTAGE OF THE INVENTION According to this invention, the half-folding apparatus of a bubble sheet which makes it possible to fold a bubble sheet stably in two can be provided.

The external view which concerns on one Embodiment of this invention. FIG. The front view. FIG. Structure explanatory drawing of the principal part which concerns on the same embodiment. FIG. Same as above. Same as above. The figure which shows the modification of the embodiment corresponding to FIG. Same as above.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view showing main components of the bag making machine of the present embodiment. As shown in FIG. 1, the bag making machine manufactures a bag body 10 from a bubble sheet 1 made of synthetic resin, and feeds mainly a half-folding device having a triangular plate 20 and a pair of feed rolls 30 and 31. The apparatus 3 is provided with a sealing device mainly composed of a heat seal bar 40 and a seal cradle 41. The bag body 10 which is a bubble sheet semi-folded product manufactured by the bag making machine of the present embodiment has the side edge portions 10b located at both ends of the folded bottom edge portion 10a fused and sealed, and the bottom edge The side facing the portion 10a is an opening 10c.

  As shown in FIGS. 1, 7 and 8, the bubble sheet 1 of the present embodiment is a two-layered structure composed of a cap film 11 having a large number of uneven projections and a flat back film 12. It is a synthetic resin bubble sheet with a structure. A large number of cylindrical protrusions are embossed on the cap film 11, and a back film 12 is joined to the protrusion opening side of the cap film 11. Thereby, air bubbles 13 in which air is sealed are formed between the cap film 11 and the back film 12. In the present embodiment, a polyolefin-based resin such as polyethylene or polypropylene is used as the synthetic resin constituting the bubble sheet 1.

  In the bag making machine, as shown in FIGS. 1 to 3, the surface of the cap film 11 and the back film 12, that is, the front and back surfaces of the air bubble sheet 1 is rolled in the horizontal direction from the raw fabric supply unit 14 wound in a vertical roll shape. The bubble sheet 1 is supplied in a state facing the surface. The half-folding device 2 forms a fold line 1a in the bubble sheet 1 using a triangular plate 20 which is a plate member having a substantially equilateral triangle. That is, one corner portion 23 abuts on the bubble sheet 1 supplied from the original fabric supply unit 14, and a fold line 10 a is formed near the center in the width direction of the bubble sheet 1. The half-folding device 2 will be described in detail later.

  As shown in FIG. 1, the feed device 3 is mainly composed of feed rolls 30 and 31 that are rotationally driven. The feed device 3 pulls out the bubble sheet 1 from the raw fabric supply unit 14 and also a downstream sealing device, that is, heat seal. The bubble sheet 1 is supplied to the bar 40 and the seal cradle 41. The feeding device 3 is provided on the downstream side of the half-folding device 2 and is composed of a pair of cylindrical rolls arranged in parallel. The feed rolls 30 and 31 are configured as nip rolls in which a sheet made of a material having a high friction coefficient (for example, rubber) is attached to the surface of a core made of metal or resin. The pair of feed rolls 30 and 31 are configured to rotate synchronously in opposite directions with the folded bubble sheet 1 sandwiched therebetween.

  As shown in FIG. 1, the sealing device 4 is mainly composed of a heat seal bar 40 and a seal cradle 41, and melts and cuts the folded bubble sheet 1 and heat-bonds the cut portion. And seal it. The heat seal bar 40 and the seal cradle 41 are provided on the downstream side of the feed rolls 30 and 31 and are disposed at positions facing each other with the bubble sheet 1 interposed therebetween. The heat seal bar 40 is movable in a direction perpendicular to the sheet surface of the bubble sheet 1. In a state in which the heat seal bar 40 is moved away from the sheet surface of the bubble sheet 1, the gap between the two folded bubble sheets 1 and the seal receiving base 41 can be sufficiently passed, and the heat seal bar 40. Is moved to the sheet surface side of the air bubble sheet 1, the air bubble sheet 1 folded in half is sandwiched with the seal receiving base 41. A linear energization heating element that generates heat by energization is provided along the longitudinal direction at a portion of the heat seal bar 40 that faces the bubble sheet 1. The energization heating element is for heating the bubble sheet 1 and performing thermal fusion to further cut the bubble sheet 1, and can raise the temperature to a temperature equal to or higher than the melting point of the bubble sheet 1. In the present embodiment, a mode is disclosed in which the sealing device 4 can perform heat sealing and cutting of the bubble sheet 1 together. Of course, only the heat sealing of the bubble sheet 1 is performed by the sealing device 4. The bubble sheet 1 may be cut by a separate cutting device.

  Here, the half-folding device 2 for the air bubble sheet 1 according to the present embodiment is a plate attached to the air bubble sheet 1 at a location where the air bubble sheet 1 sent out in a lateral direction is folded at a predetermined angle. An intermediate portion in the width direction of the air bubble sheet 1 having a corner portion 23 projecting in the thickness direction of the air bubble sheet 1 at the edge portion where the air bubble sheet 1 in the steel plate 22 and the air bubble sheet 1 are folded back. It faces the steel plate 22 so that the bubble sheet 1 can be sandwiched between the triangular plate 20 which is a triangular plate-like body forming the folding line 1a at the position and the steel plate 22 which is configured so as to be able to contact with and separate from the triangular plate 20. The pressing plate 25 is a plate-like body arranged in this manner, and magnetic pressing means 5 that presses and biases the pressing plate 25 toward the plate body by magnetism. The “intermediate position in the width direction” is not necessarily limited to the center in the width direction of the bubble sheet 1. That is, the half-folding device 2 can appropriately change the position at which the folding line 1a is provided on the air bubble sheet 1a by providing a flap from the air bubble sheet 1 to the bag body 10 as the final product, or depending on the type of the bag body 10. .

  Hereinafter, a specific configuration of the half-folding device 2 will be described.

  As shown in FIGS. 1 to 6, the half-folding device 2 is disposed between the raw fabric supply unit 14 and the feeding device 3, and a bubble sheet is placed on the main pillar 2 b erected from the base 2 a. 1 is provided. The guide portion 2f is firmly fixed to the main pillar 2b by an upper bracket 2c and a lower bracket 2d. Each of the guide portions 2f has a plate support shaft 2i and a rotation shaft 2j which are shaft bodies extending in the vertical direction. A triangular plate 20 is fixed to the plate support shaft 2i, and the rotary shaft 2j supports the holding plate 25 in a rotatable manner. Further, the triangular plate 20 can adjust the angle at which the bubble sheet 1 is folded back by adjusting the angle of the plate support shaft 2i in plan view. As shown in FIG. 4 and the like, in this embodiment, the angle at which the bubble sheet 1 is folded back in plan view by the triangular plate 20 is set to 135 °, but of course the angle can be appropriately changed by rotating the triangular plate 20.

  The triangular plate 20 is formed by forming a steel plate 22 in a triangular shape, and is attached to the plate support shaft 2i by welding or integrally connected thereto, and a mounting portion 21 corresponding to the base of the triangle, and the bubble sheet 1 corresponding to the apex of the triangle. It has a corner portion 23 that directly forms a folding line 1a to be folded, and an inclined edge 24 that corresponds to the hypotenuse of a triangle and guides the bubble sheet 1 that has passed through the corner portion 23 in the twisting direction.

  The presser plate 25 can operate so as to be able to come into contact with and separate from the triangular plate 20. The presser plate 25 has a cylindrical sleeve 26 through which the rotation shaft 2 j is inserted, and a rectangular shape in front view that extends laterally from the sleeve 26. A rotating plate portion 27 made of, for example, a resin whose side is in contact with the bubble sheet 1, and a magnet mounting portion 28 for fixing the permanent magnet 50 to the other surface side that is not in contact with the bubble sheet 1 at the tip side of the rotating plate portion 27 are provided. doing. As shown in FIG. 5, the pressing plate 25 fixes the positioning tool 29 to the rotary shaft 2j below the sleeve 26 so as to be positioned in the vertical direction. Thereby, the height at which the pressing plate 25 presses the bubble sheet 1 can be adjusted in accordance with the change in the width dimension of the bubble sheet 1 which is the original fabric or the position where the folding line 1a is desired to be formed. And the magnet attaching part 28 is provided in the planar view front-end | tip edge of the other surface side which does not contact the bubble sheet 1 in a rotary plate, and an up-down direction intermediate position. Since the aspect in which the magnet attaching portion 28 fixes the permanent magnet 50 can use various existing aspects, detailed description thereof will be omitted.

  As described above, the present embodiment is characterized by including the magnetic pressing means 5 that presses and biases the pressing plate 25 toward the plate body by magnetism. The magnetic pressing means 5 will be described with reference to FIGS.

  In the present embodiment, the triangular plate 20 is mainly made of a magnetic material that can be attracted to the magnet, more precisely, an iron steel plate 22 that is a ferromagnetic material, while the retaining plate 25 is made of resin that cannot be attracted to the magnet. By attaching the permanent magnet 50 to 25, the magnetic pressing means 5 is used by utilizing the magnetic force that the permanent magnet 50 tries to move toward the steel plate 22 together with the pressing plate 25.

  As shown in FIG. 6, the biasing force of the pressing plate 25 by the magnetic pressing means 5 is large for the bubble sheet 1 in which the size of the bubble 13 is small and the thickness dimension is set small. work. Thereby, the shift | offset | difference of the bubble sheet 1 which arises when the unevenness | corrugation by the bubble 13 passes the corner | angular part 23 and the inclined edge 24 is suppressed more effectively.

  Further, as shown in FIG. 7, the biasing force by the permanent magnet 50 is small for the bubble sheet 1 in which the size of the bubble 13 is large and the thickness dimension is set large, as compared with the aspect shown in FIG. 6. Thereby, the malfunction that the corner | angular part 23 damages the bubble 13 accidentally is avoided effectively.

  Next, the operation of the bag making machine of this embodiment will be described. First, the bubble sheet 1 is sent out. The pair of feed rolls 30 and 31 are operated to feed the bubble sheet 11 downstream by a predetermined length. At this time, the end 10b on the most downstream side of the bubble sheet 11 is sealed by the heat seal bar 40 in the previous sealing step. The feed amount of the bubble sheet 11 by the feed rolls 30 and 31 is the length of the bottom edge portion 10a and the opening portion 10c of the bag body 10 to be manufactured. When the bubble sheet 11 is sent out by the feed rolls 30 and 31, the heat seal bar 40 is moved upward. That is, in this embodiment, the operation of the feed roll corresponds to a bubble sheet 1 sending step in which the bubble sheet 1 is sent in a state of facing the transverse direction. The sent bubble sheet 1 passes through the upstream guide portion 2e and is guided to the triangular plate 20 provided in the downstream guide portion 2f. Such a process corresponds to a bubble sheet 1 guiding process for guiding the delivered bubble sheet 1 along the triangular plate 20 having a triangular plate shape. Then, the crease 1 a is formed near the center in the sheet width direction of the bubble sheet 1 by the corner portion 23 of the triangular plate 20. At this time, the fold 1a is formed in a state where the pressing plate 25 is pressed toward the triangular plate 20 by the magnetic pressing means 5. A magnetic force urging step of pressing and holding the bubble sheet 1 between the pressure plate 25 and the triangular plate 20 by urging the pressure plate 25 configured to be able to contact and separate from the triangular plate 20 to the triangular plate 20 by a magnetic force; The folding sheet 1a is formed on the bubble sheet 1 in contact with the corner portion 23 by sending the bubble sheet 1 in close contact with the triangle plate 20 in the direction of folding while contacting the corner portion 23 provided at the tip of the triangle plate 20 by this magnetic force energizing process. This corresponds to the fold line forming step to be formed. The bubble sheet 1 drawn out from the raw fabric supply unit 14 by the feed rolls 30 and 31 changes its traveling direction by the triangular plate 20 and flows toward the feeding device 3 along the sheet flow direction. The air bubble sheet 11 in which the crease 1a is formed along the length direction by the triangular plate 20 is supplied between the pair of feed rolls 30 and 31 in a folded state. This step corresponds to a bubble sheet half-folding step in which the bubble sheet 1 is half-folded into a bubble sheet 1 half-folded product at the position of the fold line 1a formed by the fold line forming step.

  Thereafter, a sealing process is performed on the half-folded foam sheet 1 in which the foam sheet 1 is folded. The heat seal bar 40 is moved downward, and the bubble sheet 11 is pressed by using the seal cradle 41 as a cradle. At this time, the energization heating element of the seal portion 43 is energized, and the energization heating element is heated to the melting point of the bubble sheet 11 or higher. Then, when the energization heating element of the seal portion 43 comes into contact with the bubble sheet 11, the folded bubble sheet 11 is fused, and sealing and cutting are performed simultaneously. Thereby, the bubble sheet 11 is cut into the downstream side and the upstream side of the heat seal bar 40 and the seal cradle 41, and the cut side edge 10b is fused and sealed. Thereafter, the heat seal bar 40 moves upward, and the energization heating element of the seal portion 43 is separated from the bubble sheet 1. The bubble sheet 1 on the downstream side of the heat seal bar 40 and the seal cradle 41 is separated from the bubble sheet 1 as a bag body 10 and discharged. The bag body 10 manufactured by the above steps is in a state where the side edge portion 10b is sealed.

  By setting it as the above structures, the half-folding apparatus 2 which concerns on this embodiment WHEREIN: When the crease | fold 1a is formed in the bubble sheet 1, the bubble sheet 1 currently clamped between the triangular plate 20 and the pressing plate 25 is Furthermore, it is always suppressed by magnetic force. As a result, when the air bubble sheet 1 is being sent out, the air bubble sheet 1 is stably operated without generating excessive frictional force, and even when the air bubble sheet 1 is stopped being sent out, the air bubble sheet 1 is less likely to shift downward. Maintained. That is, the folding line 1a is formed while maintaining the state in which it is difficult to shift. Moreover, tension is applied to the bubble sheet 1 that passes through the corners 23 due to the above-described frictional force when the bubble sheet 1 is delivered. In other words, since the pressing plate 25 acts as a back tension with the delivery device 3 by the magnetic pressing means 5, the deviation of the folding line 1a due to the unevenness of the bubble sheet 1 is also eliminated. As a result, the bubble sheet 1 can be stably folded in two.

  In particular, in the present embodiment, the magnetic force generated between the steel plate 22 and the permanent magnet 50 is used as a means for urging the presser plate 5, so that it can be applied to the bubbles 13 even when widely applied to the existing bubble sheet 1 having various thicknesses. The above effects can be stably obtained without causing damage. That is, the biasing force to the pressing plate 25 by the magnetic force is weakened so that the bubbles 13 are easily damaged without changing the specifications. In other words, according to the thickness of the bubble sheet 1 due to the size of the bubbles 13, the permanent magnet 50 applies an appropriate biasing force to the holding plate 25 that can stably form the fold line 1 a without damaging the bubbles 13. Can do. As a result, it is possible to provide the half-folding device 2 for the bubble sheet 1 that can stably and accurately form the folding line 1a on the bubble sheet 1.

  Further, in this embodiment, in order to easily introduce the present invention to existing equipment, the magnetic pressing means 5 is provided on either the triangular plate 20 or the pressing plate 25 and can be attracted to the magnet, and on the other side. The aspect which has the provided permanent magnet 50 is applied.

  Further, in this embodiment, the triangular plate is formed of the steel plate 22 so that the magnetic body is integrally formed with the triangular plate 20 so that the above-described effect can be realized by a simpler configuration, and the bubble sheet 1 is contacted on the holding plate 25 side. The aspect which attaches the permanent magnet 50 to the back side which does not perform is applied.

  In the present embodiment, the presser plate 25 is configured to be able to accurately move toward and away from the triangular plate 20. In this embodiment, the presser plate 25 operates so as to be rotatable about an axis extending in the vertical direction. It is configured to be able to contact and separate by rotating operation.

  Further, in this embodiment, the pressing plate 25 is supported from below by a positioning tool 29 fixed to the rotating shaft 2j so as to be able to cope with a change in the width dimension of the bubble sheet 1 and the position where the folding line 1a is provided. The presser plate 25 can adjust the position in the vertical direction along the rotation axis 2j that is an axis extending in the vertical direction.

  In order to make the folding line 1a smoothly, the triangular sheet 20 is stretched in the longitudinal direction in the present embodiment in order to achieve both smooth feeding of the bubble sheet 1 and reliable pressing by the pressing plate 25 and the magnetic pressing means 5. By operating so as to be rotatable along the plate support shaft 2i, which is a shaft, it is possible to move relative to the pressing plate 25, and the relative position between the triangular plate 20 and the pressing plate 25 and the angle at which the bubble sheet 1 is folded back by the triangular plate 20 are appropriately determined. You can adjust it.

<Modification>
Below, each modification of this embodiment is shown and demonstrated in FIG.9 and FIG.10. In these modified examples, components corresponding to the components of the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment described above, the magnetic pressing means 5 is configured by forming the triangular plate 20 from the steel plate 22 made of a ferromagnetic material and disposing the permanent magnet 50 on the back side of the pressing plate 25 mainly composed of the resin rotating plate portion 27. However, of course, the aspect of the said magnetic press means 5 is not restricted to the aspect of the said embodiment.

  That is, in this modified example, first, as shown in FIG. 9, the triangular plate 20 is formed of a resin plate instead of the steel plate 22, and instead of the rotating plate portion 27 of the pressing plate 25, a steel rotating steel plate 27s that is a ferromagnetic material is used. The mode which provided the permanent magnet 50 in the other surface side which does not contact the bubble sheet 1 in a resin plate, ie, a back surface side, is shown.

  As shown in FIG. 10, the triangular plate 20 is replaced with the steel plate 22 while the resin plate 22e is made of resin, the holding plate 25 is made of the resin rotary plate 27 as in the above embodiment, and the permanent magnets 50 are respectively made of the bubble sheet 1. The aspect provided in the other surface side which does not contact | connect, ie, a back surface side, is shown.

  Even if these are the same as in the above embodiment, the magnetic pressing means 5 in which the bubble sheet 1 is unlikely to be displaced can be configured, and the same effects as in the above embodiment can be achieved.

  Although the embodiment of the present invention has been described above, the specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, a mode in which the shape of the triangular plate forming the fold line in the bubble sheet is a triangular shape in front view is disclosed, but of course, the plate shape is formed into a shape having inclined edges and corners. If it is, it may not be triangular. In addition, specific modes of the pressing plate and the magnet are not limited to those of the above-described embodiment, and various modes including existing ones can be applied.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  The present invention can be used as a half-folding device that continuously folds a long bubble sheet into two.

DESCRIPTION OF SYMBOLS 1 ... Bubble sheet 1a ... Crease 10 ... Bubble sheet half-fold (bag)
DESCRIPTION OF SYMBOLS 11 ... Cap film 12 ... Back film 13 ... Bubble 2 ... Half-folding apparatus (half-folding apparatus) of a bubble sheet
20 ... Triangle plate 25 ... Presser plate 5 ... Magnetic pressing means

Further, the bubble sheet half Oributsu is Ru Tei is manufactured by semi-folding device of the foam sheet. Here, the air bubble sheet half-folded product is not limited to a mode in which the air bubble sheet is simply folded, and widely includes modes in which heat sealing processing is appropriately performed, cut, or other processing is performed. It is a concept.

Claims (10)

A plate attached to the bubble sheet at a position where the bubble sheet sent out in a lateral direction is folded at a predetermined angle, and a thickness of the bubble sheet at an edge of the plate at which the bubble sheet is folded. A triangular plate that is a triangular plate-like body that has a corner portion protruding in the direction and forms a fold line in the bubble sheet in contact with the corner portion;
A pressing plate that is a plate-like body that is arranged so as to be able to be brought into contact with and separated from the triangular plate and that faces the plate surface so that the bubble sheet can be sandwiched between the plate plate,
A half-folding device for a bubble sheet, comprising: magnetic pressing means for pressing and pressing the pressing plate toward the plate body by magnetism. 2. The bubble sheet half-folding device according to claim 1, wherein the magnetic pressing means includes a magnetic body that is provided on one of the triangular plate and the pressing plate and can be attracted to the magnet, and a magnet that is provided on the other. . The half-folding device according to claim 2, wherein the magnetic body is provided integrally with either the triangular plate or the pressing plate. The half-folding device for a bubble sheet according to claim 3, wherein the magnet is attached to a back surface side of the triangular plate or the pressing plate which is not in contact with the bubble sheet. The bubble sheet half-folding device according to claim 1, wherein the magnetic pressing means includes magnets provided on the triangular plate and the pressing plate, respectively. 6. The half-folding device for a bubble sheet according to claim 1, wherein the pressing plate is movable toward and away from the triangular plate by rotating around a longitudinally extending axis. The bubble sheet half-folding device according to claim 6, wherein the pressing plate is provided so that the position in the vertical direction can be adjusted along an axis extending in the vertical direction. The half-folding device for a bubble sheet according to claim 6 or 7, wherein the triangular plate is movable relative to the pressing plate by being pivotable along an axis extending in a vertical direction. A foamed sheet half-folded product produced by the foamed sheet half-folding device according to claim 1, 2, 3, 4, 5, 6, 7 or 8. A bubble sheet sending step for sending the bubble sheet in a state of facing the transverse direction;
A bubble sheet guiding step for guiding the delivered bubble sheet along a triangular plate having a triangular plate shape;
A magnetic biasing step of pressing and holding the bubble sheet between the pressing plate and the triangular plate by biasing the pressing plate configured to be able to contact with and separate from the triangular plate to the triangular plate by magnetic force;
A folding line is formed in the bubble sheet in contact with the corner portion by sending out the bubble sheet in close contact with the triangle plate in this magnetic biasing step in a direction of folding while contacting the corner portion provided at the tip of the triangle plate. Folding line forming step;
A foam sheet half-folding step in which the bubble sheet is half-folded into a foam sheet half-fold at the position of the fold line formed by the fold line forming step. .

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