JP6565257B2 - Pouch folding method and bending apparatus - Google Patents

Description

  The present invention relates to a pouch bending method and a bending apparatus for bending a seal portion at an edge of a pouch.

  2. Description of the Related Art Conventionally, a pouch is known in which a seal portion is bent in order to stand in a good posture, increase rigidity, or improve the touch when grasped. As a method of bending the seal portion, the present applicant has already proposed a continuous bending method and a bending device as described in Patent Document 1.

  A bending apparatus using this bending method includes a conveyance mechanism that conveys the pouch in one direction, a folding mechanism that includes a mold that bends the pouch while being conveyed, and heating that maintains the shape of the folded portion. And a mechanism. The mold is provided with a spiral gap that continuously bends the seal portion of the pouch, and the seal portion that has entered the gap is gradually bent as it advances in the conveying direction, and is moved to the pouch storage portion side on the outlet side. Wrap.

  Further, the bending mechanism has a heater for heating the mold, and the whole sealing portion is bent while being heated and softened, and then the heating mechanism maintains the bent shape and the bent portion and its The vicinity is further heated to relieve stress, reduce shape return due to springback, and maintain a predetermined bent shape.

  However, in this conventional method, in the heating mechanism, the bent portion and the vicinity thereof are heated in a wide range, so that the pouch surface is wrinkled due to friction between the softened bent portion and the heating mold surface. was there. In addition, the heat-sealable resin that forms the seal portion melts and adheres to the mold surface, or melted and solidified resin residue may remain in the pouch. It has been found that this is mainly due to the fact that a part of the inner surface of the film is exposed at the front end side end portion in the bending direction of the seal portion when the seal portion is bent.

  Note that if the heating temperature of the heating mechanism is lowered to prevent wrinkles and heat-sealable resin from melting, the spring back of the bent part will increase, so the heating time must be lengthened to relieve stress. I must. Further, when heated at a high temperature, the film may be crystallized and whitened, and further, the cooling time for stabilizing the folded shape of the pouch becomes longer and the production efficiency is lowered.

JP 2012-30911 A

  The object of the present invention is to suppress the generation of wrinkles when forming the bent portion by bending the seal portion of the pouch, to whiten the pouch, to melt the heat-sealing resin of the seal portion, and to retain the residue of the pouch of the resin residue. An object of the present invention is to provide a pouch bending method and a bending apparatus that suppresses and stably forms a bent portion.

  The present invention employs the following means in order to solve the above problems.

That is, the pouch bending method of the present invention is:
A pouch bending method for bending a heat-sealing resin welded seal part to one film surface side of a storage part,
Only the bent end portion of the pouch seal portion is partially heated, and the end portion in the bending direction of the seal portion is kept below the melting point of the heat-sealable resin.

  Moreover, it is preferable to cool the front end side end portion of the seal portion when the bent end portion obtained by bending the seal portion of the pouch is heated.

The pouch bending apparatus of the present invention is
A pouch bending apparatus for bending a seal part to which a heat sealable resin is welded to one film surface side of a storage part,
A transport mechanism for transporting the pouch;
A folding mechanism for folding the seal portion of the pouch conveyed by the conveyance mechanism to one film surface side of the storage unit;
A heating mechanism for partially heating only the bent end portion of the bent portion formed by the bending mechanism;
In the heating mechanism, a cooling means for cooling a front end side end portion in the bending direction of the seal portion to a melting point or less of the heat sealable resin,
It is characterized by having.

  According to the pouch bending method and the processing apparatus of the present invention, the bent end portion obtained by bending the pouch seal portion is partially heated to suppress the generation of wrinkles when the pouch is conveyed, and the bent end portion. It is possible to relieve stress efficiently at a low temperature. Therefore, the whitening of the film can be prevented, and the cooling time for stabilizing the bent shape of the pouch can be shortened, thereby improving the production efficiency. Furthermore, by keeping the end of the seal portion in the bending direction at the melting point of the heat-sealable resin or less, in particular, by cooling the seal portion positively by the cooling means, the heat-sealability is more stable. It is possible to prevent the resin from melting out, and accordingly, the residue of the pouch of the resin residue is suppressed, and the bent portion can be stably formed.

(A) is a front view of a pouch according to an embodiment of the present invention, (B) is a cross-sectional view of the pouch, (C) is an enlarged cross-sectional view of a folded portion of the pouch, and (D) is a front view of the pouch before bending. It is. It is explanatory drawing which shows the schematic process of the bending method of the pouch which concerns on embodiment of this invention. (A) is a figure which shows the process of the bending method of the pouch which concerns on embodiment of this invention, (B) is a schematic sectional drawing of a preheating process. (A) is a schematic perspective view of a bending die, (B) is a view showing a state where the bending die is opened, and (C) is a schematic view showing a state where the pouch is bent. It is a schematic plan view of the heating mechanism which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 1st Embodiment of this invention. It is a schematic plan view of the heating mechanism which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 2nd Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 3rd Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 4th Embodiment of this invention. It is a schematic sectional drawing of the heating mechanism which concerns on 5th Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail based on embodiments with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in these embodiments are not intended to limit the scope of the present invention only to those unless otherwise specified. .

  As shown in FIG. 1, the pouch 1 according to the embodiment of the present invention has a pair of films (a front film 2A and a rear film 2B). Then, both sides of the pair of films are respectively sealed by the seal portions 4. A storage portion 6 is provided between the pair of seal portions 4. Here, the film surface on the side where the seal portion 4 in the storage portion 6 is bent is the rear surface, and the opposite film surface is the front surface. Further, a bottom film 3 that is heat-welded in a folded state is provided at the lower ends of the front film 2A and the rear film 2B, and the front film 2A and the bottom film 3, and the rear film 2B and the bottom film 3 are respectively bottom seal portions. Heat-sealed at 3a. The upper ends of the front film 2A and the rear film 2B are open, and heat-sealed after the contents are filled.

  In addition, the resin film used for the conventionally well-known pouch can be used for 2 A of front films, the back film 2B, and the bottom film 3 mentioned above. For example, a single layer film made of a thermoplastic resin having heat sealing properties such as an olefin resin such as polypropylene or polyethylene, or a thermoplastic resin film having these heat sealing properties as an inner layer of a pouch, and thermoplastics such as polyester and nylon A laminated film having a layer configuration of two or more layers in which other films such as a resin and a metal foil are laminated can be used. And the seal part 4 is formed by heat-sealing the heat sealable resin of an inner layer. In addition, the shape of the pouch 1 according to the embodiment of the present invention is not limited to this as long as the pouch 1 is formed with the seal portion 4 by heat-sealing the heat-sealable resin. A pouch may be used.

  As shown in FIGS. 1B and 1C, the left and right seal portions 4 are bent toward the rear film 2 </ b> B, which is one film surface of the storage portion 6. As described above, the seal portion 4 is formed by the welded portion of the heat sealable resin.

  The portion including the seal portion 4 is bent with a planned bending line 7a extending linearly. Then, as shown in FIG. 1 (D), the planned bending line 7a is located slightly on the storage unit 6 side from the inner edge 4i of the seal unit 4 by a predetermined dimension. Although it depends on the thickness of the film, it is preferable that the planned folding line 7a is located about 2.5 mm away from the inner edge 4i of the seal portion 4 toward the storage portion 6 side. In addition, although not shown in figure, the bending line 7a may be made on the seal part 4, and the seal part 4 may be bent and the bending part 7 may be formed.

  As shown in FIG. 1C, the bent portion 7 bent along the planned bending line 7 a has a shape in surface contact with the film surface of the rear film 2 </ b> B constituting the storage portion 6. Then, a bent end portion 7 b is formed on the outer edge of the bent portion 7. In addition to the formation of the bent portion 7, the rear film 2 </ b> B and the front film 2 </ b> A are misaligned at the front end 4 a in the bending direction of the seal portion 4, and the heat-sealable resin that is the inner film of the rear film 2 </ b> B. Appears on the outside.

Next, a method for bending a pouch according to an embodiment of the present invention will be described. The bending method according to the embodiment of the present invention includes a bending step of bending the seal portion 4 by applying an external force, and the bending end portion 7b of the bending portion 7 is partially heated to relieve stress, and the shape of the bending portion 7 And a heating step for holding.

  In the folding step, as shown in FIGS. 2A and 2B, the bent portion 7 is formed by bending the portion including the seal portion 4 along the planned bending line 7 a until it comes into contact with the storage portion 6.

  In the heating step, which is the next step, as shown in FIG. 2C, immediately after the bent portion 7 is formed, the bent end portion 7b is brought into contact with the heating mold 420 to be heated and bent. Part 7 is formed. In this way, even if the bent end portion 7b of the bent portion 7 is heated in the heating process, heat is not applied to the seal portion 4 constituting the bent portion 7 or it is difficult to apply it. Therefore, the bent portion 7 is surely formed. The tip end 4a in the bending direction of the seal portion 4 can keep the melting point or lower of the heat-sealable resin (FIG. 2D). Further, in order to partially heat the bent end portion 7b as described above, the bent portion 7 can be formed by bending the bending line 7a on the seal portion 4. Even in this case, the front end side end portion 4a in the seal portion 4 can keep the melting point or less of the heat sealable resin. Therefore, as described above, at the front end side end portion 4a of the seal portion 4, although the heat sealable resin that is the inner surface film of the rear film 2B is slightly exposed on the outer surface, the melting of the heat sealable resin is suppressed. Residue pouch residue can be prevented.

  Next, the overall configuration of the pouch bending apparatus according to the embodiment of the present invention will be described with reference to FIG. The bending apparatus includes a conveyance mechanism 20 that conveys the pouch 1, a preheating mechanism 10 that preheats the pouch 1, a folding mechanism 30 that bends the seal portion 4 of the pouch 1, and a bending end of the bending portion 7 formed by the bending mechanism 30. A heating mechanism 40 that partially heats the portion 7 b and a cooling mechanism 50 that is appropriately disposed on the downstream side of the heating mechanism 40 are provided.

  As shown in FIG. 3B, the preheating mechanism 10 includes a preheating die 12 having a gap 11 through which the seal portion 4 passes and a heater 13 that heats the preheating die 12, and the seal portion 4 and the vicinity thereof are arranged. Heat to predetermined temperature. The heating temperature is a temperature in the vicinity of the melting point of the pouch inner surface material (heat-sealable resin), and is softened to the extent that no wrinkles are generated by the subsequent folding mechanism 30.

  The transport mechanism 20 is composed of a plurality of transport roller pairs 21 arranged at predetermined intervals in the transport direction (see FIG. 6). The conveyance roller pair 21 is composed of a pair of conveyance rollers 21 a and 21 b arranged on the front and back surfaces of the pouch 1. A plurality of these transport roller pairs 21 are arranged in a range from the preheating mechanism 10 to the cooling mechanism 50, and transport the pouch 1 with the pair of transport rollers 21a and 21b interposed therebetween. Although not particularly illustrated, a conveyance guide for guiding the pouch 1 can be provided so as not to interfere with the conveyance roller pair 21. Further, the conveyance roller pair 21 is disposed so as to sandwich the central region of the storage portion 6 of the pouch 1 so as not to interfere with the bent portion 7 obtained by bending the seal portion 4.

  The transport mechanism 20 does not have to be the above-described roller transport system as long as a predetermined driving force capable of transporting the pouch 1 in the transport direction is obtained, and various transport systems such as a belt drive and an air transport mechanism can be used. Can be adopted.

Next, the bending mechanism 30 will be described with reference to FIG. The bending mechanism 30 includes molds 310 that are arranged in parallel to the seal portion 4 of the pouch 1 to be conveyed. As shown in FIGS. 4A and 4B, the mold 310 includes an outer mold 312 provided on the outer side in the folding direction of the seal portion 4, and an inner mold 313 provided on the inner side in the folding direction of the seal portion 4. , And a gap 311 is formed between the outer mold 312 and the inner mold 313.

  As shown in FIG. 4C, the pouch 1 to be conveyed is a process in which the portions including the seal portion 4 (both side portions of the pouch 1) pass through the gap 311 between the outer die 312 and the inner die 313. Thus, the sheet is bent inward along a planned bending line 7a parallel to the conveyance direction X. The portion including the seal portion 4 is bent to the storage portion 6 by the outer die 312 at a position past the end of the inner die 313.

  As will be described in detail later, the heating mechanism 40 partially heats the bent end portion 7b of the pouch 1 being conveyed while maintaining the end portion 4a in the bending direction of the seal portion 4 below the melting point of the heat-sealable resin. Is configured to do. Moreover, in order to keep the front end side end 4a in the seal part 4 below the melting point of the heat sealable resin more reliably, the cooling means for cooling the front end side end part 4a in the seal part 4 below the melting point of the heat sealable resin. It is desirable to adopt a configuration in which is provided.

  And the pouch 1 which passed the heating mechanism 40 is sent to the cooling mechanism 50, and is cooled, and the shape of the bending part 7 is stabilized. As the cooling mechanism 50, a mechanism provided with a conveyance guide and a cooling device for cooling the conveyance guide can be suitably used. In addition, as a cooling device, the cooler which flows cooling media, such as cooling water and cooling gas, a cooling fan, etc. are applicable. By these cooling devices, the components (heat exchange block) constituting the conveyance guide can be cooled. In short, the cooling mechanism 50 may be anything that can be cooled while maintaining the bent form of the seal portion of the pouch.

  Hereinafter, the heating mechanism 40 will be described using a more specific example.

(First embodiment)
With reference to FIGS. 5-7, the heating mechanism which concerns on 1st Embodiment of this invention is demonstrated. FIG. 5 is a schematic plan view of the heating mechanism according to the first embodiment of the present invention. 6 and 7 are schematic cross-sectional views of the heating mechanism according to the first embodiment of the present invention, FIG. 6 is a cross-sectional view taken along the line AA in FIG. 5, and FIG. 7 is a cross-sectional view taken along the line BB in FIG. is there. FIG. 7A shows a state where the pouch 1 is not passing, and FIG. 7B shows a state where the pouch 1 is passing. An arrow P in FIGS. 5 and 6 indicates the conveyance direction of the pouch 1.

  The heating mechanism 40 according to this embodiment is disposed between a base 410, a pair of heating molds 420 provided on both sides of the base 410, and the pair of heating molds 420 and the transport mechanism 20. A pair of outlet side lower guides 430 and a pair of outlet side upper guides 440 fixed to the inner wall surfaces of the pair of heating molds 420, respectively. In FIG. 5, the heating mechanism 40 is illustrated as being short, but the heating mold 420 may be long according to the required heating time, or several heating molds 420 may be arranged in the transport direction, The downstream heating mold 420 may be provided with upper and lower guides 430 and 440 on the outlet side.

  The distance between the inner wall surfaces of the pair of heating molds 420 is set to be slightly narrower (for example, about 1 mm narrower) than the width of the pouch 1 subjected to the bending process. Thereby, when the pouch 1 passes through the heating mechanism 40, the bent end portion 7b of the bent portion 7 is slightly (for example, about 0.5 mm) inside by the surface of the heating mold 420 (corresponding to the heating surface). The pouch 1 is conveyed in a state where the pouch 1 is pushed in. Therefore, while the pouch 1 passes through the heating mechanism 40, the bent end portion 7b is more reliably in contact with the surface of the heating mold 420. Note that the heating mold 420 is heated by a heater 421 provided therein.

The pair of outlet side lower guides 430 and the pair of outlet side upper guides 440 include the heating mechanism 40.
Is provided in order to maintain the bent state of the bent portion 7 of the pouch 1 to be conveyed more reliably. Thereby, it can send in the state which closed the bending part 7 of the pouch 1 with respect to the cooling mechanism 50 from the heating mechanism 40 stably.

  And in this embodiment, when the bending edge part 7b is heated by the heating mechanism 40, as a cooling means which cools the front end side edge part 4a of the sealing part 4 in the bending direction to below melting | fusing point of heat-sealable resin. A blowing mechanism for blowing air onto the surface of the pouch 1 is provided. The spray mechanism includes an air pump 450 and an air passage (a passage formed by the air nozzle 451 or the like) supplied by the air pump 450. A plurality of through holes 411 are formed in the base 410, and air supplied from the air pump 450 is blown out from the lower side of the base 410 to the upper portion of the base 410 through the plurality of through holes 411. Thereby, when the pouch 1 passes through the heating mechanism 40, air is blown onto the surface of the bent portion 7.

  With the configuration as described above, when the pouch 1 passes through the heating mechanism 40, the pouch 1 includes the transport mechanism 20 (a plurality of transport roller pairs 21), the inner wall surface of the heating mold 420, and a pair of outlets. It contacts only the side lower guide 430 and the pair of outlet side upper guides 440 and does not contact other members. Further, when the pouch 1 passes through the heating mechanism 40, the bent portion 7 of the pouch 1 is only the bent end portion 7b until it reaches the pair of outlet side lower guides 430 and the pair of outlet side upper guides 440. Is in contact with the inner wall surface of the heating mold 420, and the other portions are not in contact with other members. Further, while the conveyed pouch 1 is heated by the heating mechanism 40, the bent end portion 7b slides against the inner wall surface (heated surface) of the heating mold 420, and the bent portion near the bent end portion 7b. The surface on the folding side of 7 is exposed to air. A gap is provided between the inner wall surface of the heating mold 420 and the outlet side lower guide 430. Therefore, even when the pouch 1 passes through the outlet side lower guide 430, the surface of the bent portion 7 in the vicinity of the bent end portion 7b is exposed to air. Therefore, as described above, even if there is no air blown from the plurality of through-holes 411, the front end side end portion 4a in the seal portion 4 can be kept below the melting point of the heat-sealable resin.

  As described above, while the pouch 1 being conveyed is heated by the heating mechanism 40, the bent end portion 7b is partially heated, and the surface of the bent portion 7 in the vicinity thereof is exposed to air. In combination with the fact that the air is blown onto the surface of the bent portion 7, the front end side end portion 4 a of the seal portion 4 is more reliably cooled below the melting point of the heat-sealable resin. . Therefore, the partial heating of the bent end portion 7b of the pouch 1 can suppress the generation of wrinkles when the pouch is conveyed, and the bent end portion 7b can be efficiently relieved of stress at a low temperature. Therefore, the whitening of the film can be prevented, and the cooling time for stabilizing the bent shape of the pouch can be shortened, thereby improving the production efficiency. Furthermore, the surface of the bent portion 7 is exposed to air, and the tip side end portion 4a of the seal portion 4 is kept below the melting point of the heat-sealable resin, and is actively cooled by the cooling means. Thus, the heat-sealable resin is prevented from melting out, and the residual resin residue on the pouch is also suppressed. Moreover, even if a part of the heat-sealable resin melts, the skin is instantaneously generated on the surface by blowing air, and further melting is suppressed. .

(Second Embodiment)
8 to 10 show a second embodiment of the present invention. In the present embodiment, in addition to the configuration of the first embodiment, a configuration in which an inlet side lower guide is provided in the heating mechanism is shown. Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate. FIG. 8 is a schematic plan view of a heating mechanism according to the second embodiment of the present invention. 9 and 10 are schematic cross-sectional views of the heating mechanism according to the second embodiment of the present invention. FIG. 9 is a cross-sectional view taken along line AA in FIG. 8, and FIG. 10 is a cross-sectional view taken along line BB in FIG. is there. FIG. 10A shows a state where the pouch 1 is not passing, and FIG. 10B shows a state where the pouch 1 is passing.

  In the heating mechanism 40 according to the present embodiment, a pair of inlet-side lower guides 460 is provided in addition to the configuration of the heating mechanism 40 shown in the first embodiment. Other configurations are as described in the first embodiment. In the case of the heating mechanism 40 shown in the first embodiment, the transported pouch 1 is supported only by the transport mechanism 20 in the vicinity of the entrance of the heating mechanism 40, so that there is a risk that the vicinity of both sides of the pouch 1 will flutter. There is. Therefore, in the present embodiment, a pair of inlet side lower guides 460 disposed between the pair of heating dies 420 and the transport mechanism 20 are provided. Thereby, fluttering near both sides of the pouch 1 can be suppressed even near the entrance of the heating mechanism 40. Here, a gap is provided between the inlet-side lower guide 460 and the inner wall surface of the heating mold 420. Therefore, as in the case of the first embodiment, while the pouch 1 being conveyed is heated by the heating mechanism 40, the bent end portion 7b slides against the inner wall surface (heating surface) of the heating mold 420. Although it moves, the surface of the bent portion 7 in the vicinity of the bent end portion 7b is exposed to air. In FIG. 8, the heating mechanism 40 is illustrated as being short, but the heating mold 420 is lengthened in accordance with the required heating time, and the inlet-side lower guide 460 and the outlet-side lower guide 430 are further separated. A plurality of heating dies 420 are arranged in the transport direction, the most upstream heating dies 420 are provided with inlet-side lower guides 460, and the most downstream heating dies 420 are provided with outlet-side upper and lower guides 430, 440. May be provided.

  As described above, also in the heating mechanism 40 according to the present embodiment, the same effect as in the case of the actual first embodiment can be obtained. In the case of the present embodiment, it is possible to suppress the vicinity of both sides of the pouch 1 from flapping near the entrance of the heating mechanism 40. When the pouch 1 passes through the inlet side lower guide 460, the pouch 1 is blown with air from below, and the air flows between the pouch 1 and the upper surface of the inlet side lower guide 460 (FIG. 10B). )reference). Therefore, it can suppress that the pouch 1 contacts with respect to the entrance side lower guide 460. FIG. Therefore, even if part of the heat-sealable resin melts, the melted heat-sealable resin can be prevented from adhering to the inlet side lower guide 460.

  Here, it is preferable to form a curved surface chamfer (so-called R surface) 461 on the edge of the upper surface of the inlet side lower guide 460 on the side close to the inner wall surface of the heating mold 420 as shown in FIG. It is. By providing such a chamfer 461, the air supplied from the air pump 450 can flow toward the inlet side lower guide 460 side by the Counder effect in a state where the pouch 1 is not passing (see FIG. 10 (A)). Thereby, it can suppress that the temperature of the inner wall face of the metal mold | die 420 for a heating falls, and the inlet side lower guide 460 can be cooled.

(Third embodiment)
FIG. 11 shows a third embodiment of the present invention. In the said 1st Embodiment and 2nd Embodiment, although the structure in the case of using the spraying mechanism which sprays air on the surface of a pouch as a cooling means was shown, in this embodiment, the case where a cooling block is used as a cooling means The structure of is shown. Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate. FIG. 11 is a schematic sectional view of a heating mechanism according to the third embodiment of the present invention. FIG. 11 is a cross-sectional view corresponding to FIG. 7B in the first embodiment.

  In the present embodiment, a cooling block 470 is provided on the base 410 so as to be adjacent to the heating mold 420. Although not shown in particular, a pair of cooling blocks 470 are provided in the same manner as the heating mold 420. The cooling block 470 is cooled by a cooling medium such as cooling water or cooling gas flowing through a passage 471 provided therein. In the present embodiment, when the bent portion 7 slides on the surface of the cooling block 470, the end portion 4a in the bending direction of the seal portion 4 is kept below the melting point of the heat-sealable resin.

(Fourth embodiment)
FIG. 12 shows a fourth embodiment of the present invention. In the present embodiment, a modification of the third embodiment will be described. Since the basic configuration is the same as that of the third embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted as appropriate. FIG. 12 is a schematic cross-sectional view of a heating mechanism according to the fourth embodiment of the present invention. FIG. 12 is a cross-sectional view corresponding to FIG. 7B in the first embodiment.

  In the present embodiment, the cooling block 470 is provided on the base 410 with the heating mold 420 and the gap S therebetween. Although not shown in particular, a pair of cooling blocks 470 are provided in the same manner as the heating mold 420. The cooling block 470 is cooled by a cooling medium such as cooling water or cooling gas flowing through a passage 471 provided therein. In the present embodiment, when the bent portion 7 slides on the surface of the cooling block 470, the end portion 4a in the bending direction of the seal portion 4 is kept below the melting point of the heat-sealable resin. In the present embodiment, since the gap S is provided between the heating mold 420 and the cooling block 470, heat exchange between the heating mold 420 and the cooling block 470 is suppressed. Can do.

(Fifth embodiment)
FIG. 13 shows a fifth embodiment of the present invention. In the present embodiment, a modification of the third embodiment will be described. Since the basic configuration is the same as that of the third embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted as appropriate. FIG. 13 is a schematic sectional view of a heating mechanism according to the fifth embodiment of the present invention. FIG. 13 is a cross-sectional view corresponding to FIG. 7B in the first embodiment.

  In the present embodiment, a cooling block 470 and a heat insulating member 480 disposed between the cooling block 470 and the heating mold 420 are provided on the base 410. Although not particularly shown, a pair of cooling block 470 and heat insulating member 480 are provided in the same manner as heating mold 420. The cooling block 470 is cooled by a cooling medium such as cooling water or cooling gas flowing through a passage 471 provided therein. In the present embodiment, when the bent portion 7 slides on the surface of the cooling block 470, the end portion 4a in the bending direction of the seal portion 4 is kept below the melting point of the heat-sealable resin. In the present embodiment, since the heat insulating member 480 is provided between the heating mold 420 and the cooling block 470, heat exchange between the heating mold 420 and the cooling block 470 is suppressed. be able to.

(Other)
In the above-described embodiment, the case where the bending process is performed in one stage has been described as an example. However, the bending may be performed in two stages (two-stage folding process using two planned folding lines), and may be performed in three or more stages. You may make it perform the bending process (bending process in three or more bending lines) in a step. Further, not only a single bent portion but also a double bent portion may be formed.

  Moreover, although the side seal part was illustrated and demonstrated in the said embodiment as a seal part, this invention is not limited to a side seal part, It is applicable about the seal part of edge parts of pouches, such as a top seal part.

  In the above-described embodiment, the bending mechanism 30 is described as being configured to bend the portion including the seal portion 4 until it contacts the storage portion 6. However, the bending mechanism 30 may be bent to a position where it does not contact the storage portion 6.

  Further, the cooling means is not limited to those shown in the above embodiments, and various devices can be applied. For example, the seal portion can be cooled using a cooling block incorporating a Peltier element.

DESCRIPTION OF SYMBOLS 1 Pouch 2A Front film 2B Rear film 3 Bottom film 3a Bottom seal part 4 Seal part 4a Welding part 4i Inner edge 6 Storage part 7 Bending part 7a Bending line 7b Bending edge 10 Preheating mechanism 11 Clearance 12 Preheating type 13 Heater 20 Heater 20 Mechanism 21 Conveying roller pair 21a, 21b Conveying roller 30 Bending mechanism 40 Heating mechanism 50 Cooling mechanism 310 Mold 311 Gap 312 Outer mold 313 Inner mold 410 Base 411 Through hole 420 Heating mold 421 Heater 430 Outlet side lower guide 440 Outlet side Upper guide 450 Air pump 460 Inlet side lower guide 470 Cooling block 471 Passage 480 Thermal insulation member

Claims (5)

A pouch bending method for bending a heat-sealing resin welded seal part to one film surface side of a storage part,
A method of bending a pouch characterized by partially heating only a bent end portion of the seal portion of the pouch, and keeping a tip end side end portion in the bending direction of the seal portion below the melting point of the heat-sealable resin. .   2. The pouch bending method according to claim 1, wherein when the bent end portion of the pouch is partially heated, the tip side end portion of the seal portion is cooled. A pouch bending apparatus for bending a seal part to which a heat sealable resin is welded to one film surface side of a storage part,
A transport mechanism for transporting the pouch;
A folding mechanism for folding the seal portion of the pouch conveyed by the conveyance mechanism to one film surface side of the storage unit;
A heating mechanism for partially heating only the bent end portion of the bent portion formed by the bending mechanism;
In the heating mechanism, a cooling means for cooling a front end side end portion in the bending direction of the seal portion to a melting point or less of the heat sealable resin,
A pouch bending apparatus characterized by comprising:   4. The pouch bending apparatus according to claim 3, wherein the cooling means is a blowing mechanism that blows air onto the surface of the pouch.   The said heating mechanism slides the said bending edge part with respect to the heating surface in the said heating mechanism, and exposes the surface of the bending side of the said bending part in the vicinity of the said bending edge part to air. Or the pouch bending apparatus according to 4.

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