JP2015006895A - Storage bag and method and apparatus for production of storage bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage bag which allows tearing easily a seal part of a storage bag in an intended direction to remove a part of the storage bag, even under influence of orientation of molecules in a biaxially-oriented film of a composite film and its production method and production apparatus.SOLUTION: A storage bag 1 includes a folded part 11 formed by folding double a composite film 2 including a biaxially-oriented film as a base material film, a longitudinal seal part 12 formed by heat-sealing together end edge parts of the double folded composite film 2 and a lateral seal part 13 formed by heat-sealing together end edge parts adjacent to the folded part 11 in the composite film 2 that becomes cylindrical owing to formation of the longitudinal seal part 12. In the end part of the lateral seal part 13 on the side of the folded part 11, a plurality of through holes 14 penetrating the lateral seal part 13 are provided from the outer end edge side to the inner end edge side of the lateral seal part 13.

Description

  The present invention relates to a storage bag, a method for manufacturing a storage bag, and a manufacturing apparatus.

  Conventionally, in a storage bag for storing various items such as food and cosmetics, in order to make it easy to cut out a part of the storage bag when opened, a cutting line (cutting bar) for guiding cutting to the seal portion of the storage bag or A notch is provided.

  For example, the liquid packaging bag shown in Patent Document 1 guides the opening of the pouring passage from the upper end side of the sealing portion of the packaging bag toward the side portion of the pouring passage that communicates with the space to be packed with the package. A tear guide rod is formed (see, for example, FIGS. 2 and 3 of Patent Document 1), and the discharge passage can be easily opened by tearing the seal portion along the tear guide rod. .

  In addition, the easy-open bag shown in Patent Document 2 is formed with a cut that connects between the edges of the bag and a wound group consisting of a piercing hole at the edge of the seal portion of the bag so as to straddle the cut. (For example, refer to FIG. 3 of Patent Document 2), tearing is started from a portion where the wound group is formed, and after the tearing is started, the bag is easily opened by tearing the bag along the cut line. It is something that can be done.

  Here, the conventional storage bag as shown in Patent Document 1 and Patent Document 2 is formed by stretching a film-formed unstretched film 110 as shown in FIG. Manufactured by a composite film F formed by laminating a heat seal material (not shown) such as polyethylene on the inside of the biaxially stretched film 100 (base film) to be formed.

  As shown in FIG. 9, the biaxially stretched film 100 is obtained by heating a film that has been uniaxially stretched in the longitudinal direction by a longitudinal stretching machine (not shown) to a temperature that can be stretched in a preheating zone. It is formed by stretching in the transverse direction. That is, the biaxially stretched film 100 is formed by performing a process of stretching in the biaxial directions of the vertical and horizontal directions and orienting the molecules in the film in the stretched direction. The biaxially stretched film 100 formed in this way is cut to a predetermined width, for example, as shown in FIGS. 9A to 9D, and further required as a storage bag 150, as shown in FIG. 10A. While being cut into a wide width G, a heat seal material is bonded to the inside thereof, whereby the composite film F is wound up as an original fabric R.

  In the conventional storage bag as shown in Patent Document 1 and Patent Document 2, one composite film F fed out from the original fabric R is superposed on two sheets, or as shown in FIG. One composite film F fed out from the anti-G is folded in half at the center line T and overlapped, and as shown in FIG. 10 (c), the edge portions of the overlapped composite film F are heat sealed with a predetermined width. Thus, a seal portion is formed, and a cut line (cutting ridge) or a cut is provided in the formed seal portion, so that a part of the storage bag can be cut out.

Japanese Patent No. 5092118 Japanese Patent No. 4456572

  However, as shown by H in FIG. 9, in the biaxially stretched film 100, the orientation of molecules in the film at the center (B and C) is substantially the same direction (the orientation of molecules in the film flow direction, Or the orientation of molecules in the width direction of the film is substantially the same direction), but the orientation of molecules in the film at both ends (A and D) is different. That is, the direction of molecular orientation in the biaxially stretched film 100 is different between the both end portions (A and D) and the central portion (B and C). For this reason, also in the composite film F used for a storage bag, the direction of molecular orientation in the biaxially stretched film 100 that is the base film differs depending on the cutting position (A to D) of the biaxially stretched film 100. Therefore, when the composite film F formed by cutting from the central part (B and C) of the biaxially stretched film 100 is folded in two and heat sealed, the film is formed on the front side and the back side of the seal part S of the storage bag. In the case of the composite film F formed by cutting from both ends (A and D) of the biaxially stretched film 100, the orientation of the molecules in the same direction (substantially overlap) is shown in FIG. As indicated by H in c), the orientation of molecules in the film is different (crossed) on the front side and the back side of the seal portion S of the storage bag 150. This is the same whether the seal portion S is a horizontal seal or a vertical seal.

  Thus, when the orientation of the molecules in the film is substantially the same direction (substantially overlapping) on the front side and the back side of the seal part S of the storage bag, by providing a cut in the seal part S, it is relatively small The seal portion S can be torn with the tear strength, but when the orientation of molecules in the film is different (crossed) on the front side and the back side of the seal portion S of the storage bag, the molecules in the film There is a problem that the seal portion S cannot be torn unless the orientation becomes resistance and the tear strength is increased. In addition, when a tear line (cutting bar) is provided on the seal part S of the storage bag in which the orientation of molecules in the film is different (crossed) on the front side and the back side of the seal part S (for example, Patent Documents) 1 and Patent Document 2), the problem is that the orientation of molecules in the film becomes resistance as described above, and it is difficult to tear the seal portion S as the tear line (cut-off line) induces. was there.

  The present invention solves the above-mentioned problem, and even when it is affected by the orientation of the molecules in the biaxially stretched film in the composite film, the storage bag can be easily torn in the intended direction. It is an object of the present invention to provide a storage bag that can be partially removed, a manufacturing method thereof, and a manufacturing apparatus thereof.

  In order to solve the above-described problem, the storage bag according to the invention of claim 1 is folded in two by a folded portion formed by folding a composite film including a biaxially stretched film as a base film, and the folded portion. The vertical seal part formed by heat-sealing the edge parts of the composite film, and the edge parts adjacent to the bent part in the composite film formed into a cylindrical shape by forming the vertical seal part A plurality of through holes penetrating the horizontal seal portion at an end of the horizontal seal portion at the bent portion side. It is provided from the edge side to the inner end edge side of the lateral seal portion.

  According to the said structure, when cutting off a part of storage bag and opening a storage bag, a horizontal seal part can be torn along a through-hole.

  According to a second aspect of the present invention, there is provided a storage bag manufacturing method in which a composite film including a biaxially stretched film as a base film is folded in two to form a bent portion, and the folded bag is folded in two by the folding step. The vertical sealing step in which the edge portions of the composite film are heat-sealed to form a vertical seal portion, and the edge portions adjacent to the bent portion in the composite film that has become cylindrical by the vertical sealing step are heated. A lateral sealing step for sealing and forming a lateral seal portion, and a plurality of through holes penetrating the lateral seal portion are provided from an outer edge side of the lateral seal portion at an end of the lateral seal portion on the bent portion side. A hole penetrating step provided on the inner edge side of the lateral seal portion.

  According to the above manufacturing method, a storage bag capable of tearing the lateral seal portion along the through-hole when cutting a part of the storage bag and opening the storage bag can be manufactured.

  Furthermore, the method for manufacturing a storage bag according to the invention of claim 3 is the method for manufacturing the storage bag according to claim 2, wherein the hole penetration step cools the horizontal seal portion formed by the horizontal seal step. This is performed together with the cooling process.

  According to the said manufacturing method, the process of providing a some through-hole in a horizontal seal part and the process of cooling a horizontal seal part can be performed simultaneously, a manufacturing process is simplified and manufacturing efficiency improves. Moreover, a through-hole can be efficiently provided with respect to the composite film heated in the horizontal sealing process.

  Furthermore, the storage bag manufacturing apparatus according to the invention of claim 4 is folded in half by a folding mechanism that folds a composite film including a biaxially stretched film as a base film to form a folded portion, and the folding mechanism. A vertical seal mechanism that heat seals the edge portions of the composite film to form a vertical seal portion, and heats the edge portions adjacent to the bent portion in the composite film that is formed into a cylindrical shape by the vertical seal mechanism. A lateral seal mechanism that seals to form a lateral seal portion, and a plurality of through holes that penetrate the lateral seal portion are provided from an outer edge side of the lateral seal portion at an end portion of the lateral seal portion on the bent portion side. And a hole penetrating mechanism provided on the inner end edge side of the lateral seal portion.

  According to the said manufacturing apparatus, when cutting off a part of storage bag and opening a storage bag, the storage bag which can tear a horizontal seal part along a through-hole can be manufactured.

  Further, the storage bag manufacturing apparatus according to the invention of claim 5 is the storage bag manufacturing apparatus according to claim 4 of the invention, wherein the hole penetration mechanism cools the horizontal seal portion formed by the horizontal seal mechanism. The cooling mechanism is provided.

  According to the manufacturing apparatus, since the mechanism for providing a plurality of through holes in the horizontal seal portion and the mechanism for cooling the horizontal seal portion can be provided integrally, the size of the device can be reduced. Moreover, a through-hole can be efficiently provided with respect to the composite film heated by the horizontal sealing mechanism.

  As effects of the present invention, the following effects can be obtained. That is, according to the storage bag, when the storage bag is opened by removing a part of the storage bag, the seal portion of the storage bag can be torn along the through hole. In the case of a storage bag in which the orientation of the molecules in the direction is substantially the same (substantially overlapping), the seal part can be torn with a smaller tear strength, and the molecules in the film can be separated on the front side and back side of the seal part. In the case of the storage bags having different orientations (intersecting states), the seal portion of the storage bag can be easily torn in the intended direction even under the influence of the orientation of the molecules in the film.

  In addition, according to the above method and apparatus for manufacturing a storage bag, even while being affected by the orientation of molecules in the biaxially stretched film, a part of the storage bag can be easily removed by tearing the seal portion in the intended direction. A storage bag that can be removed can be manufactured.

(A) is a top view of the storage bag in the Example of this invention, (b) is a partially expanded plan view of the through-hole vicinity in (a), (c) is a top view of the through-hole in (a). , (D) and (e) are partially enlarged plan views in the vicinity of a through hole which is another embodiment of (a). (A) is a partially enlarged plan view of the horizontal seal portion when a through hole is provided in the horizontal seal portion in the storage bag in which the orientation of molecules in the film is different between the front side and the back side of the horizontal seal portion; b) is a partially enlarged plan view of the horizontal seal portion when a through-hole is not provided in the horizontal seal portion in the storage bag in which the orientation of molecules in the film is different between the front side and the back side of the horizontal seal portion. . (A) is a plan view of the storage bag in the embodiment of the present invention, (b) is a partially enlarged plan view of the vicinity of the through hole in (a), and (c) is a vertical seal in the horizontal seal portion of the through hole. The top view of the storage bag provided in the edge part by the side of a part, (d) is a partially expanded plan view of the through-hole vicinity in (c). (A) is a top view of the storage bag in another Example of this invention, (b) is a partially expanded plan view of the through-hole vicinity in (a). It is a flowchart of the manufacturing method of the storage bag in the Example of this invention. (A) is a top view of a hole penetration member, (b) is a side view of a hole penetration member. It is a whole outline front view of a storage bag manufacturing device in an example of the present invention. It is AA sectional drawing in FIG. It is a schematic diagram which shows the manufacturing method of a biaxially stretched film. It is a schematic diagram until it cuts the biaxially stretched film of FIG. 9 and manufactures the conventional storage bag, (a) is the schematic diagram of the biaxially stretched film cut | disconnected by A, B, C, and D of FIG. , (B) is a schematic view of a composite film drawn out from the original film of the composite film including the biaxially stretched film cut in A of FIG. 9, and (c) is a heat fold of the composite film of (b). It is a schematic diagram of the conventional storage bag manufactured by sealing.

  Below, the structure of the storage bag 1, the manufacturing method of the storage bag 1, and the manufacturing apparatus 20 of the storage bag 1 which concern on the Example of this invention is demonstrated based on drawing.

  First, the storage bag 1 which concerns on the Example of this invention is demonstrated.

  As shown in FIG. 1, the storage bag 1 is formed by folding a single composite film 2 containing a biaxially stretched film as a base film into two, and overlapping and overlapping the end portions of the double-folded composite film 2. It is a bag formed by heat-sealing the combined edge portions. That is, the storage bag 1 is formed by bending one of the four end edges of the composite film 2 (without forming a heat seal).

  Specifically, the storage bag 1 heat seals the folded portion 11 formed by folding the composite film 2 in half and the end edges of the folded composite film 2 by forming the folded portion 11. And a horizontal seal portion formed by heat-sealing the edge portions adjacent to the bent portion 11 in the composite film 2 formed into a cylindrical shape by forming the vertical seal portion 12. 13 and 13.

  The folding part 11 is one of the four edge parts of the storage bag 1 and is a part formed by folding the composite film 2 without heat sealing.

  The vertical seal portion 12 is an end edge portion on the side facing the bent portion 11 among the four end edge portions of the storage bag 1, and when the composite film 2 is folded in two, the vertical seal portion 12 is on the side facing the bent portion 11. It is a portion formed by overlapping end edges and heat-sealing the overlapped end edges. The vertical seal portion 12 is formed with a predetermined width inward from the outer edge of the storage bag 1.

  The lateral seal portions 13 and 13 are end edge portions on the side adjacent to the bent portion 11 among the four end edge portions of the storage bag 1, and are adjacent to the bent portion 11 when the composite film 2 is folded in two. It is a part formed by superposing the edge parts on the side and heat-sealing the superposed edge parts. The lateral seal portion 13 is formed with a predetermined width from the outer edge of the storage bag 1 to the inner side of the storage bag 1. Further, the lateral seal portion 13 is formed at the two edge portions of the storage bag 1. Specifically, the two ends of the storage bag 1 in a state where the contents W (see FIG. 7) are poured (filled) into the composite film 2 in which the bent portion 11 and the vertical seal portion 12 are formed. A lateral seal portion 13 is formed at the edge.

  In addition, the storage bag 1 is provided with a plurality of through holes 14 for inducing tearing of the horizontal seal portion 13 in the horizontal seal portions 13 and 13. In other words, the storage bag 1 has a plurality of through-holes 14 formed with cut portions and cut lines (cut-off ridges) provided in the lateral seal portion 13 in order to make it easy to cut a part of the storage bag 1 when opening. Yes. As shown in FIG. 1, the through-hole 14 is a hole penetrating from the surface of the lateral seal portion 13 toward the back surface. Specifically, as shown in FIG. This is a hole including a hole portion 14a penetrating toward the surface and a crack portion 14b formed radially around the hole portion 14a. In addition, the through-hole 14 is not limited to the shape shown in FIG.1 (c), What is necessary is just the hole-shaped shape penetrated from the surface of the horizontal seal | sticker part 13 toward a back surface. A plurality of through holes 14 are provided at predetermined intervals in a predetermined range in the longitudinal direction of the horizontal seal portion 13 from the outer end edge side to the inner end edge side of the horizontal seal portion 13. The arrangement of the through holes 14 is not limited to FIGS. 1 (a) and 1 (b). As shown in FIG. 1 (d) or FIG. You may arrange | position toward a direction.

  Here, as shown by H in FIG. 2, in the storage bag 1 in which the orientation of molecules in the film is different between the front side and the back side of the horizontal seal part 13, the inner side from the outer edge A of the horizontal seal part 13 When tearing to the edge B, it is necessary to tear the horizontal seal portion 13 with a tear strength greater than the resistance due to the orientation of the molecules in the film. Therefore, as shown in FIG. 2 (b), when the through-hole 14 is not provided in the lateral seal portion 13, when the lateral seal portion 13 is torn, the resistance due to the orientation of molecules in the film is strongly received. Even if the notch portion C is provided in the outer edge A, the lateral seal portion 13 cannot be torn unless the lateral seal portion 13 is torn with a tear strength greater than the resistance. On the other hand, as shown in FIG. 2 (a), when the through-hole 14 is provided in the lateral seal portion 13, the above-described resistance is applied when tearing the lateral seal portion 13, but the adjacent through-hole 14 is traced. Since the horizontal seal portion 13 can be torn, the horizontal seal portion 13 can be easily torn even under the influence of molecular orientation in the film of the composite film 2.

  As shown in FIGS. 1, 3 (a) and 3 (b), the through hole 14 is provided at the end of the lateral seal portion 13 on the bent portion 11 side.

  Here, as shown in FIGS. 3 (c) and 3 (d), when a part of the storage bag 1 </ b> A provided with the through hole 14 at the end of the horizontal seal portion 13 on the vertical seal portion 12 side is cut out, The inner edge of the lateral seal portion 13 is cut through each through-hole 14 while being affected by the orientation of molecules in the film while cutting from the crack portion 14b of the through-hole 14 in the vicinity of the outer edge A of the seal portion 13. After tearing to B, the vertical seal portion 12 is torn from the inner edge J of the vertical seal portion 12. However, in such a case, the cut end K of the storage bag 1A is shifted between the front and back while the storage bag 1A is torn from the inner end edge B of the horizontal seal portion 13 to the inner end edge J of the vertical seal portion 12. The cut K of the bag 1A is caught by the inner edge J of the vertical seal portion 12, the vertical seal portion 12 cannot be torn, and a part of the storage bag 1A cannot be removed. On the other hand, as shown in FIGS. 3 (a) and 3 (b), in the case of the storage bag 1 in which the through hole 14 is provided at the end of the lateral seal portion 13 on the bent portion 11 side, the outer end of the lateral seal portion 13. After starting from the crack 14b of the through hole 14 in the vicinity of the edge A and tearing to the inner edge B of the lateral seal part 13 through each through hole 14 while being influenced by the orientation of molecules in the film The bent portion 11 that is not heat-sealed is torn. Therefore, even when the cut edge K of the storage bag 1 is displaced between the front and back, the cut edge K of the storage bag 1 is not caught by the bent portion 11, so that the bent portion 11 can be torn and one of the storage bags 1 can be torn. The part can be easily removed. Thus, even if it is a case where it is influenced by the orientation of molecules in the film in the composite film 2 by providing the plurality of through holes 14 at the end portion on the side of the bent portion 11 in the lateral seal portion 13, Even if the cut end of the storage bag 1 is shifted between the front and back at the edge of the storage bag 1, a part of the storage bag 1 can be easily removed.

  Furthermore, in the vicinity of the through hole 14 of the horizontal seal portion 13, a display unit (not shown) indicating a location where the through hole 14 is provided is provided. For example, a display unit on which a triangular display is printed Is provided. Thus, by providing the display portion in the vicinity of the through hole 14 of the horizontal seal portion 13, it is possible to clarify the cutting position in the horizontal seal portion 13. In addition, this display part is not limited to the thing of a triangle, If it shows the location in which the through-hole 14 is provided, for example, the table | surface of the horizontal seal part 13 in which the through-hole 14 is provided will be shown. The back side may be printed in a specific color.

  Furthermore, as another embodiment of the storage bag 1, a plurality of through holes 14 may be provided in the lateral seal portion 53 of the storage bag 50 as shown in FIG. Specifically, as shown in FIG. 4, the width of the end portion of the horizontal seal portion 53 on the bent portion 51 side is narrower than the width of the end portion of the horizontal seal portion 53 on the vertical seal portion 52 side. In the storage bag 50 having the portion 53, the plurality of through holes 14 are provided on the side of the bent portion 51 of the lateral seal portion 53.

  As shown in FIG. 4B, the horizontal seal portion 53 has a cutout portion 53 a in which a part of the end portion on the bent portion 51 side is cut out from the inner edge side to the outer edge side of the horizontal seal portion 53. In the storage bag 50, the storage bag 50 is filled by changing the tearing position P in the cutout portion 53a when the horizontal seal portion 53 is torn from the outer edge side of the horizontal seal portion 53 to the cutout portion 53a. The outflow amount of the contents W can be adjusted. Therefore, in the storage bag 50, by arranging the through hole 14 from the outer edge side of the lateral seal portion 53 toward the cutout portion 53a, the lateral seal portion 53 can be torn toward the intended tearing position P. it can.

  Next, the manufacturing method of the storage bag 1 which concerns on the Example of this invention is demonstrated.

  As shown in FIG. 5, first, the composite film 2 is fed out while applying a predetermined tension from the raw material R of the composite film 2, and the fed-out composite film 2 is folded in two along the conveyance longitudinal direction (longitudinal direction). The folded portion 11 of the storage bag 1 is formed (folding step S1).

  Next, the end edges of the composite film 2 folded in the folding step S1 in the conveyance longitudinal direction (longitudinal direction) are overlapped, and the overlapped end edges are heat-sealed to vertically seal the storage bag 1. The part 12 is formed (vertical sealing step S2). By this vertical sealing step S2, the composite film 2 is formed in a cylindrical shape so that the bent portion 11 and the vertical sealing portion 12 face each other.

  Next, the content W (see FIG. 7) is poured (filled) into the composite film 2 formed into a cylindrical shape by the vertical sealing step S2 (filling step S3). And in the state where the contents W are poured into the composite film 2, the edge portions in the width direction (lateral direction) of the composite film 2 (end edges adjacent to the bent portion 11) are heat-sealed, The horizontal seal part 13 of the storage bag 1 is formed (transverse seal process S4). By this horizontal sealing step S4, the contents W are sealed in the storage bag 1.

  Next, in the composite film 2 in which the horizontal seal part 13 is formed by the horizontal seal process S4, the seal surface of the horizontal seal part 13 is cooled by being pushed from the front and back (cooling process S5A). By this cooling step S5A, the appearance of the sealing surface in the lateral seal portion 13 of the storage bag 1 is improved.

  Further, in the composite film 2 in which the lateral seal portions 13 and 13 are formed by the lateral seal step S4, a plurality of through holes 14 are formed in the lateral seal portions 13 and 13 (hole penetration step S5B). As shown in FIG. 6, the plurality of through holes 14 are formed by arranging a member (a hole penetrating member 28a, which will be described later) formed by arranging a plurality of square pyramids having a vertex of a quadrangular pyramid in a rectangle or a square as a horizontal seal portion. It is formed by pressing against 13 sealing surfaces. In addition, the method of forming the through-hole 14 is not limited to the method of pressing the member having the tip of the quadrangular pyramid as the cutting edge against the seal surface of the horizontal seal portion 13. As long as it is a method capable of forming the through hole 14, for example, a method of piercing a needle-like protrusion into the seal surface of the lateral seal portion 13 may be used.

  Moreover, hole penetration process S5B is performed simultaneously with said cooling process S5A. By performing hole penetration process S5B simultaneously with cooling process S5A, a manufacturing process is simplified and manufacturing efficiency improves. Moreover, since the through-hole 14 will be formed with respect to the composite film 2 heated in horizontal sealing process S4, the through-hole 14 can be formed efficiently. In addition, this manufacturing method is not limited to the method of performing the hole penetration step S5B simultaneously with the cooling step S5A, as long as it is possible to form a plurality of through holes 14 on the seal surface of the lateral seal portion 13. The hole penetration step S5B and the cooling step S5A may be performed sequentially. Further, the hole penetration step S5B may be performed simultaneously with the horizontal sealing step S4.

  Furthermore, in the composite film 2 processed by the cooling step S5A and the hole penetration step S5B, the storage bag 1 is manufactured by cutting the central portion of the lateral seal portion 13 (cutting step S6).

  Next, the manufacturing apparatus 20 of the storage bag 1 which concerns on the Example of this invention is demonstrated.

  As shown in FIGS. 7 and 8, in the manufacturing apparatus 20 for the storage bag 1, an original fabric R around which the composite film 2 is wound is mounted on and supported by an original fabric shaft 21. The manufacturing apparatus 20 for the storage bag 1 includes a film guide mechanism 22 that guides the composite film 2 fed from the raw fabric R to the upper side of the manufacturing apparatus 20 for the storage bag 1 while being given a predetermined tension.

  Further, the manufacturing apparatus 20 of the storage bag 1 has a folding mechanism 23 that folds the composite film 2 guided by the film guide mechanism 22 in half and draws it out to the lower side of the manufacturing apparatus 20 of the storage bag 1 for guidance. The folding mechanism 23 is folded in half along the longitudinal direction (conveying direction, longitudinal direction) of the composite film 2 to form the folded portion 11 of the storage bag 1.

  Further, the manufacturing apparatus 20 of the storage bag 1 heat-seals the composite film 2 folded in two by the folding mechanism 23 in the vertical direction (longitudinal direction of the composite film 2 and transport direction of the composite film 2). Have The vertical seal mechanism 24 includes a vertical seal member 24b provided on the outer periphery of a pair of opposed vertical seal rolls 24a, which is rotatably provided by a driving unit M1 including, for example, a servo motor. The vertical seal mechanism 24 presses a pair of opposing vertical seal members 24 b against the composite film 2 to heat-seal in the vertical direction to form the vertical seal portion 12 of the storage bag 1. The vertical sealing mechanism 24 heats the composite film 2 in the vertical direction, thereby forming the composite film 2 in a cylindrical shape so that the bent portion 11 and the vertical seal portion 12 face each other.

  Furthermore, the manufacturing apparatus 20 of the storage bag 1 has a filling mechanism 26 for filling the contents W into the composite film 2. The filling mechanism 26 includes a filling nozzle portion 26 a for pouring the contents W into the composite film 2 and a pump (not shown) for feeding the contents W.

  Furthermore, the manufacturing apparatus 20 of the storage bag 1 heats the composite film 2 formed into a cylindrical shape by the vertical sealing mechanism 24 in the lateral direction (the width direction of the composite film 2 and the direction orthogonal to the conveyance direction of the composite film 2). A horizontal sealing mechanism 25 for sealing is provided. The horizontal sealing mechanism 25 is provided below the vertical sealing mechanism 24, that is, downstream in the conveyance direction of the composite film 2. The horizontal seal mechanism 25 is provided so as to be rotatable by a driving means M2 made of, for example, a servo motor, and has a plurality of horizontal seal members 25b provided along the width direction of the outer periphery of a pair of opposed horizontal seal rolls 25a. The horizontal sealing mechanism 25 presses a pair of opposing horizontal sealing members 25b against the composite film 2, thereby heat-sealing at a predetermined interval in the horizontal direction to form the horizontal sealing portion 13 of the storage bag 1. . The horizontal sealing mechanism 25 seals the contents W in the storage bag 1 by heat-sealing the composite film 2 in the horizontal direction.

  Furthermore, the manufacturing apparatus 20 of the storage bag 1 has a cooling mechanism 27 for cooling the lateral seal portion 13. The cooling mechanism 27 is provided below the horizontal sealing mechanism 25, that is, downstream in the conveyance direction of the composite film 2. The cooling mechanism 27 includes a plurality of pressing members 27b that are provided so as to be rotatable by a driving unit M3 made of, for example, a servo motor, and are respectively provided along the width direction of the outer periphery of a pair of opposed lateral rolls 27a. Then, the cooling mechanism 27 cools the sealing surface of the lateral seal portion 13 by pressing a pair of opposing pressing members 27b against the composite film 2.

  Furthermore, the manufacturing apparatus 20 of the storage bag 1 has a hole penetration mechanism 28 for forming a plurality of through holes 14 in the lateral seal portion 13. As shown in FIG. 6, the hole penetrating mechanism 28 is configured by a hole penetrating member 28 a configured by arranging a plurality of square pyramids U with the apex of the quadrangular pyramids as a cutting edge in a rectangular or square shape. The hole penetrating mechanism 28 forms a plurality of through holes 14 in the lateral seal portion 13 by pressing the apex of the quadrangular pyramid U of the hole penetrating member 28 a against the composite film 2. The hole penetrating member 28a is not limited to a member configured by arranging a plurality of quadrangular pyramids U. For example, as long as the plurality of through holes 14 can be formed in the horizontal seal portion 13, for example, Further, it may be a member configured by arranging a plurality of needle-like protrusions.

  In addition, one side of the hole penetrating member 28a is formed to have substantially the same length as the length in the width direction of the horizontal seal portion 13 (the length from the outer end edge to the inner end edge of the horizontal seal portion 13). . That is, one side of the hole penetrating member 28a is determined according to the length in the width direction of the lateral seal portion 13 of the storage bag 1 to be manufactured.

  Further, as shown in FIGS. 7 and 8, the hole penetration mechanism 28 is provided in the cooling mechanism 27. Specifically, the hole penetrating member 28 a of the hole penetrating mechanism 28 is provided on the pressing member 27 b of the cooling mechanism 27. The hole penetrating member 28 a rotates according to the horizontal roll 27 a of the cooling mechanism 27 and presses against the horizontal seal portion 13, thereby forming a plurality of through holes 14 in the horizontal seal portion 13.

  Furthermore, the manufacturing apparatus 20 of the storage bag 1 has a cutting mechanism 29 for cutting the storage bag 1 manufactured continuously at the central portion of the lateral seal portion 13. The cutting mechanism 29 is provided on the most downstream side in the manufacturing apparatus 20 of the storage bag 1 and cuts the storage bags 1 manufactured continuously into individual storage bags 1.

  As described above, according to the storage bag 1 according to the above embodiment, when the storage bag 1 is opened by removing a part of the storage bag 1, the lateral seal portion 13 can be torn along the through hole 14. In the case of the storage bag 1 in which the orientation of the molecules in the film is substantially the same on the front side and the back side of the horizontal seal part 13, the horizontal seal part 13 can be torn with a smaller tear strength. In the case of the storage bag 1 in which the orientation of the molecules in the film is different between the front side and the back side of the part 13, it is easily accommodated in the intended direction even though it is affected by the orientation of the molecules in the film. The lateral seal portion 13 of the bag 1 can be torn.

  Moreover, according to the manufacturing method and the manufacturing apparatus 20 of the storage bag 1 which concerns on the said Example, when opening the storage bag 1, the storage bag 1 which can tear the horizontal seal part 13 along the through-hole 14 is manufactured. Therefore, even if it is influenced by the orientation of the molecules in the biaxially stretched film, the storage bag can be easily removed by tearing the horizontal seal portion 13 in the intended direction. 1 can be manufactured.

DESCRIPTION OF SYMBOLS 1 Storage bag 2 Composite film 11 Bending part 12 Vertical seal part 13 Horizontal seal part 14 Through-hole 20 Manufacturing apparatus 23 Bending mechanism 24 Vertical sealing mechanism 25 Horizontal sealing mechanism 27 Cooling mechanism 28 Hole penetration mechanism S1 Bending process S2 Vertical sealing process S4 Horizontal Sealing process S5A Cooling process S5B Hole penetration process

Claims (5)

A folded part formed by folding a composite film containing a biaxially stretched film as a base film, and
A vertical seal portion formed by heat-sealing the edge portions of the composite film folded in two by the bent portion;
The horizontal seal part formed by heat-sealing the edge parts adjacent to the bent part in the composite film that has become cylindrical by forming the vertical seal part,
Have
A plurality of through holes penetrating the lateral seal portion are provided at an end portion of the lateral seal portion on the bent portion side from an outer end edge side of the lateral seal portion to an inner end edge side of the lateral seal portion. Characteristic storage bag. A folding process in which a composite film containing a biaxially stretched film as a base film is folded in two to form a folded portion;
A vertical sealing step in which end edges of the composite film folded in two by the bending step are heat-sealed to form a vertical sealing portion;
A horizontal sealing step in which the edge portions adjacent to the bent portion are heat-sealed to form a horizontal sealing portion in the composite film formed into a cylindrical shape by the vertical sealing step;
A hole penetrating step in which a plurality of through-holes penetrating the lateral seal portion are provided from an outer edge side of the lateral seal portion to an inner end edge side of the lateral seal portion at an end of the lateral seal portion on the bent portion side; ,
A method for manufacturing a storage bag, comprising:   The said hole penetration process is performed with the cooling process which cools the horizontal seal part formed by the said horizontal seal process, The manufacturing method of the storage bag of Claim 2 characterized by the above-mentioned. A folding mechanism that folds a composite film containing a biaxially stretched film as a base film to form a folded portion;
A vertical seal mechanism that heat seals the edge portions of the composite film folded in two by the bending mechanism to form a vertical seal portion;
A horizontal sealing mechanism that forms a horizontal seal portion by heat-sealing the edge portions adjacent to the bent portion in the composite film that has become cylindrical by the vertical seal mechanism;
A hole penetrating mechanism in which a plurality of through holes penetrating the lateral seal portion are provided from an outer edge side of the lateral seal portion to an inner edge side of the lateral seal portion at an end of the lateral seal portion on the bent portion side; ,
An apparatus for manufacturing a storage bag, comprising:   The said bag penetration mechanism is provided in the cooling mechanism which cools the horizontal seal part formed of the said horizontal seal mechanism, The manufacturing apparatus of the storage bag of Claim 4 characterized by the above-mentioned.

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