JP6346504B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag for packaging foods such as liquids, gels, solids, and powders, cosmetics, detergents, pharmaceutical preparations and the like.

  As a packaging form in the case of sealing food, cosmetics, detergents, pharmaceutical preparations, etc. in liquid, gel, solid, powder, etc. with a packaging film, a resin film in which a thermoplastic resin is laminated on the inner surface side is used. A packaging form is used in which the contents are filled from an unsealed portion of a semi-finished product of a film bag formed by sealing sides or three sides, and then the filling port is sealed.

  In these packaging forms, the packaging bag is unsealed by grasping both sides of an opening notch (notch) formed in the seal portion of the film edge and tearing the film, and the contents are taken out. At this time, if a step is formed on the opening end of the torn packaging bag between the front side and the back side of the packaging bag, the opening can be easily widened by picking the step with a finger when taking out the contents.

  For example, in Patent Documents 1 to 3, a first cut line starting from one outer edge of the edge thermal bonding portion and ending at the other outer edge is formed in one outer layer of the laminate constituting the packaging bag. The second outer layer of the laminated body is a packaging bag in which a second cut line starting from one outer edge of the edge thermal bonding portion and ending at the other outer edge is formed, and in the state of the laminated body in plan view A packaging bag is disclosed in which a first cut line is formed by a cut line that swells toward the upper end side and a cut line that swells toward the lower end side, and the second cut line is formed by a single straight cut line.

JP 2012-96839 A JP 2013-209159 A JP 2013-209160 A

  In the packaging bags of Patent Documents 1 to 3, when the user pulls the side where the first score line is formed (for example, the front side) facing the front, the force when opening is applied downward, The front side is broken along a cut line (lower cut line) that swells to the lower end side. Further, on the side (back side) where the second cut line is formed, the straight second cut line is formed above the lower cut line, so that it is caught along the second cut line when opened. Without breaking. Similarly, when the user pushes the back side toward the front, the opening force is applied downward, so the front side is along the lower cut line, and the back side is the straight second cut line. It breaks without being caught along. In this specification, the term “cutting” means that the portion above the cut line is gripped, and the gripping portion is pulled toward the near side, and the push cut is the portion above the cut line. Gripping means that the gripping part is pushed to the back side and cut.

  On the other hand, when the user draws the back side facing the front, the second cut line formed on the back side facing the front is formed above the lower cut line on the front side, The force at the time of opening acts more strongly on the second cut line than on the first cut line. In addition, since the second cut line is formed in a straight line in the horizontal direction, the direction of the force applied when opening (downward direction) and the forming direction of the second cut line do not match, and the film has the second cut line. It may not break smoothly along. As a result, there is a problem in that it becomes difficult to open because it becomes resistance at the time of opening and requires force for opening, and the opening edge is wavy or the broken line is moved downward from the second cut line.

  In view of the above problems, an object of the present invention is to provide a packaging bag that can easily widen the opening by a step formed in the tear opening and can be easily torn and opened regardless of the opening direction of the user.

  In order to achieve the above-mentioned object, the present invention is configured so that the inner layers of a rectangular first film and a second film having at least an outer layer, an intermediate layer, and an inner layer made of a heat-adhesive resin are overlapped with each other. Side seal portions are formed on the left and right side edge edges, and the outer layer of the first film starts from a position retracted inward from the outer edge of one of the side seal portions. The start point and the side seal Forming a first cut line that continues from the position retracted inward from the outer edge of the other side seal portion having the same vertical position parallel to the portion, and on the outer layer of the second film, Starts at the position retracted inward from the outer edge of the side seal part, and recedes inward from the outer edge of the other side seal part having the same vertical position parallel to the start point and the side seal part. As the end point A second cut line is formed, and the vertical and vertical positions of the start point and the end point of the first cut line and the second cut line are substantially the same, and the trajectory from the start point to the end point is different. Thus, when the opening is formed by breaking the upper end side of the packaging bag along the first cut line and the second cut line in a direction perpendicular to the left and right side seal portions, A packaging bag that creates a step between an outer edge of one cut surface and an outer edge of the other cut surface of one film and the second film, wherein the first cut line and the second cut line are the left and right sides A pair of straight cut lines that progress inward from the position retracted inward from the outer edge of the part seal part and beyond the inner edge of the side seal part, and gradually from the end of the pair of straight cut lines Branch in an arc shape so that the rising angle is large A bilaterally symmetric shape comprising at least a lower cut line that swells to the lower end side and an upper cut line that diverges in a curved line so that the rising angle gradually increases from the end of the pair of linear cut lines and swells to the upper end side Is formed in the region from the outer edge of the side seal portion to the linear cut line, and either the first cut line or the second cut line has the above-mentioned A protruding portion that protrudes in a curve so as to approach the upper cut line is formed in a part of the lower cut line, and one of the upper cut lines is formed on the other of the first cut line or the second cut line. A protruding portion that protrudes in a curve so as to approach the lower cut line is formed in the portion.

  Further, in the packaging bag having the above-described configuration, the first cut line and the second cut line may be arranged such that the first cut line and the second cut line are inner edges of the side seal part from two locations that are recessed inward from the outer edges of the left and right side seal parts. It is characterized by having a pair of convergent cut lines that continue in the direction toward the bottom and converge outside the inner edge of the side seal portion and are continuous with the straight cut lines.

  Moreover, this invention is a packaging bag of the said structure. WHEREIN: The said lower cut line and the said upper cut line which comprise the said 1st cut line, and the said lower cut line and the said upper cut line which comprise the said 2nd cut line Of these, the curvature of the straight cut line is gentler on the side where the projection is formed than on the side where the projection is not formed.

  In the packaging bag having the above-described configuration, the lower cut line and the upper cut line are continuous to an end point of the linear cut line so that the straight cut line is a tangent. .

  In the packaging bag having the above-described configuration, the second cut line has a shape obtained by inverting the first cut line in the vertical direction.

  In the packaging bag having the above-described configuration, the present invention provides a maximum separation distance between the lower cut line forming the first cut line and the lower cut line forming the second cut line, and the first cut line. A maximum separation distance between the upper cut line constituting the upper cut line and the second cut line constituting the second cut line is 2 mm or more.

  Further, the present invention provides the packaging bag having the above-described configuration, in which the inner surfaces of the first film and the second film are engaged with each other at positions opposed to each other on the lower end side of the first cut line and the second cut line. A synthetic resin occlusion device comprising a protruding male member and a female female member is provided, and has a resealing function by engaging the male member and the female member. It is said.

  According to the first configuration of the present invention, even if the first film or the second film constituting the packaging bag is drawn or pushed in a state of facing the front, the packaging including the upper seal portion The upper end portion of the bag can be smoothly cut along the first cut line and the second cut line. That is, regardless of the direction in which the user grips and opens the packaging bag, the user can open the bag smoothly and cleanly with a light force along the first cut line and the second cut line.

  Moreover, according to the 2nd structure of this invention, in the packaging bag of the said 1st structure, the 1st cut line and the 2nd cut line are two places which retreated inside rather than the outer edge of a right-and-left side part seal part. It progresses in the direction toward the inner edge of the side seal part, converges outside the inner edge of the side seal part, and has a pair of converging cut lines that are continuous with the straight cut line. Since the break line thus formed intersects with one of the pair of convergent cut lines adjacent to the inside of the opening start means, the break line can be reliably guided to the first cut line and the second cut line.

  Moreover, according to the 3rd structure of this invention, in the packaging bag of the said 1st or 2nd structure, the lower side cut line and upper side cut line which comprise a 1st cut line, and a 2nd cut line are comprised. Of the lower cut line and the upper cut line, the side on which the protruding portion is formed protrudes when the packaging bag is opened by making the curvature relative to the straight cut line gentler than the side on which the protruding portion is not formed. The lower cut line and the upper cut line in which the portion is formed can be easily selected, and the opening of the packaging bag can be stabilized.

  According to the fourth configuration of the present invention, in the packaging bag having any one of the first to third configurations, the lower cut line and the upper cut line are straight lines such that the straight cut line is a tangent line. Since the break line formed at the time of opening the packaging bag smoothly proceeds from the straight cut line to the lower cut line or the upper cut line by continuing to the end point of the cut line, the break line extends from the straight cut line. When branching to the lower cut line or the upper cut line, it becomes difficult to come off the cut line, and the packaging bag can be opened smoothly and cleanly along the first cut line and the second cut line.

  According to the fifth configuration of the present invention, in the packaging bag having any one of the first to fourth configurations, the second cut line formed in the second film is formed on the first film. By making the shape in which the first cut line is inverted in the vertical direction, it is a case where either the first film or the second film constituting the packaging bag is opened in a state facing the front, and the same opening property is ensured. be able to.

  According to the sixth configuration of the present invention, in the packaging bag having any one of the first to fifth configurations, the lower cut line constituting the first cut line and the lower cut line constituting the second cut line. By setting the maximum separation distance of the cut line and the maximum separation distance of the upper cut line constituting the first cut line and the upper cut line constituting the second cut line to be 2 mm or more, the first cut line and the second cut line When the lower cut line is selected in both cases, or when the upper cut line is selected in both the first cut line and the second cut line, the edge of the cut surface of the first film and the second film A step is surely formed.

  According to the seventh configuration of the present invention, in the packaging bag of any of the first to sixth configurations, from the first cut line and the second cut line on the inner surfaces of the first film and the second film. By providing a synthetic resin occlusion tool composed of a protruding male member and a concave female member that are engaged with each other at the lower end side, the male member and the female member are engaged with each other. The packaging bag can be easily resealed without using an adhesive tape or clip.

The top view which looked at the packaging bag 1 which concerns on one Embodiment of this invention from the surface side film 3a side The top view which looked at the packaging bag 1 of this embodiment from the back surface side film 3b side Partial sectional view of the vicinity of the upper seal portion 5 in the packaging bag 1 of the present embodiment The elements on larger scale of the 1st cut line 20 formed in the surface side film 3a of the packaging bag 1 of this embodiment. The elements on larger scale of the 2nd cut line 21 formed in the back surface side film 3b of the packaging bag 1 of this embodiment. Partial plan view of the periphery of the opening edge of the packaging bag 1 opened by cutting the front-side film 3a toward the front. Partial plan view of the periphery of the opening edge of the packaging bag 1 opened by pressing the back side film 3b toward the front. The partial plan view of the periphery of the opening edge of the packaging bag 1 in which the back side film 3b is broken along the lower cut line 21c and opened by vigorously pushing the back side film 3a toward the front. The partial plan view of the periphery of the opening edge of the packaging bag 1 in which the front side film 3a is broken along the upper cut line 20d and opened by cutting the back side film 3b toward the front. The partial plan view of the periphery of the opening edge of the packaging bag 1 in which the front side film 3a is broken along the lower cut line 20c and opened by cutting the back side film 3b toward the front. Schematic which shows the manufacturing process of the packaging bag 1 of this embodiment.

  Hereinafter, the package of the present invention will be described with reference to the drawings. 1 and 2 are schematic plan views of the packaging bag 1 of the present invention as viewed from the front side and the back side, respectively, and FIG. 3 is a sectional view of the vicinity of the upper seal portion 5 of the packaging bag 1 shown in FIG. 1 is a cross-sectional view taken along the line AA ′ in FIG. The packaging bag 1 heat seals the upper end edge of the rectangular front side film 3a and the back side film 3b to form the upper seal part 5, and heat seals the lower end edge to form the lower seal part 6. A storage portion 8 is formed by heat-sealing the side edge portions to form side seal portions 7. In addition, since the lower seal part 6 is used for the filling port of the contents, it is an unsealed part before filling the contents, and the storage part 8 is sealed by heat sealing after filling the contents.

  Further, at the opening position of the upper part of the packaging bag 1, opening notches (I notches) 10 are provided as opening start means in the side seal portions 7 at both ends. The opening notch 10 is provided so as to penetrate through the front surface side film 3a and the back surface side film 3b collectively from the outer edge of the left and right side seal portions 7 to the position not reaching the inner edge. The position of the opening notch 10 in the vertical direction of the packaging bag 1 (the distance from the outer edge of the upper seal portion 5) is the same. Here, the opening notch 10 is formed with an I-notch, but a V-notch or a U-notch may be used instead of the I-notch. Moreover, it can replace with the notch 10 for opening, and the scar part area | region which consists of a some fine piercing hole can also be provided in the side part seal part 7. FIG.

  Moreover, the 1st cut line 20 and the 2nd cut line 21 are formed in the outer layer of the surface side film 3a and the back surface side film 3b, respectively. The opening notch 10 is formed in a region surrounded by convergent cut lines 20 a and 21 a (see FIGS. 4 and 5) constituting the first cut line 20 and the second cut line 21. Detailed shapes of the first cut line 20 and the second cut line 21 will be described later.

  An opening / closing chuck 9 made of a thermoplastic resin is provided near the lower portion of the opening notch 10. The opening / closing chuck 9 is composed of an upper chuck (female member) 9a and a lower chuck (male member) 9b. Each of the front side film 3a and the rear side film from one side seal part 7 to the other side seal part 7 is provided. It is heat-sealed so as to cross the storage portion 8 along the inner surface of 3b.

  As shown in FIG. 3, the front-side film 3a and the back-side film 3b are a laminate in which an outer layer 11, an intermediate layer 12 made of aluminum foil, and an inner layer 13 made of a heat-adhesive resin layer (thermoplastic resin layer) are laminated. It is. As the outer layer 11, since it becomes a basic material constituting the packaging bag 1, a synthetic resin film having excellent properties in mechanical, physical, chemical and the like can be used. For example, polyester-based, polyamide-based Polypropylene resin or the like can be used. Moreover, as a film using these resin, the stretched film extended | stretched to the biaxial direction is suitable. This is because the outer layer 11 is usually subjected to printing and printability is required. Further, the thickness of the film constituting the outer layer 11 may be determined in consideration of cost and the like, but approximately 12 to 25 μm is appropriate.

  As the aluminum foil used for the intermediate layer 12, an annealed aluminum foil is suitable, and the thickness is about 6 to 15 μm. The inner layer 13 may be a layer formed of a heat-adhesive resin that can be melted by heat and welded to each other, and may be appropriately selected depending on the physical properties required for the packaging bag 1. Examples of the heat-adhesive resin used for the inner layer 13 include low density polyethylene, medium density polyethylene, high density polyethylene, linear (linear) low density polyethylene, polypropylene, ethylene-α olefin copolymer, and ethylene-propylene. It can be formed of a copolymer, an ethylene-vinyl acetate copolymer, an ionomer resin, an acid copolymer of ethylene and acrylic acid, an ester copolymer of ethylene and acrylic acid ester, or the like. As a method for forming the inner layer 13, a method of laminating the above-mentioned thermoadhesive resin by a melt extrusion method or a method of laminating a thermoplastic single layer or multilayer film is used. The thickness of the inner layer 13 may be appropriately determined in consideration of required physical properties (heat sealability), cost, and the like, and is preferably about 10 μm to 100 μm, particularly preferably about 15 μm to 50 μm.

  Furthermore, the physical properties required when the packaging bag 1 is formed between the intermediate layer 12 and the inner layer 13, such as mechanical toughness, bending resistance, puncture resistance, impact resistance, cold resistance, heat resistance, In order to impart physical properties such as chemical resistance, a strength reinforcing layer made of a film such as polyester, polyamide, polyethylene, polypropylene, polyolefin such as ethylene-propylene copolymer, or a resin layer may be provided. The strength reinforcing layer may be a combination of the above-described film and resin layer, and the thickness of the strength reinforcing layer may be appropriately determined in consideration of required physical properties, costs, and the like.

  What is necessary is just to laminate | stack suitably using well-known lamination methods, such as a sandwich lamination method and a dry lamination method, as a lamination | stacking method of each layer of the laminated | multilayer film which comprises the surface side film 3a and the back surface film 3b. Further, the first cut line 20 and the second cut line 21 may be physically formed using a rotary die cutter, but preferably the outer layer 11 after forming a laminated film using a pulse oscillation type laser or the like. To form. As a laser used for forming the first cut line 20 and the second cut line 21, a carbon dioxide laser, a YAG laser, a semiconductor laser, an argon ion laser, or the like can be used, and is not particularly limited.

  4 and 5 are portions of the first cut line 20 and the second cut line 21 formed on the front surface side film 3a and the back surface side film 3b of the packaging bag 1 of the present embodiment shown in FIGS. 1 and 2, respectively. It is an enlarged view. FIG. 4 is a view seen from the front surface side film 3a side of the packaging bag 1, and the second cut line 21 formed on the back surface side film 3b is indicated by a broken line. Moreover, FIG. 5 is the figure seen from the back surface side film 3b side of the packaging bag 1, and has shown the 1st cut line 20 formed in the surface side film 3a with a broken line.

  The first cut line 20 formed on the surface-side film 3a constituting the packaging bag 1 extends from the two locations retracted inward (right side) from the outer edges of the left and right side seal parts 7 to the inner edge of the side seal parts 7. The two pairs of convergent cut lines 20a that converge in a direction that does not reach the inner edge of the side seal portion 7 and the convergent points of the convergent cut lines 20a are respectively connected to the left and right side seal portions 7. A straight cut line 20b that progresses in the direction perpendicular to the inside of the packaging bag 1, a lower cut line 20c that bulges from the end point of the linear cut line 20b to the lower end side of the packaging bag 1, and an upper cut line 20d that bulges to the upper end side. Is composed of. Note that the convergent cut line 20a formed on the right side seal portion 7 and the straight cut line 20b continuous to the convergent cut line 20a are the left converged cut line 20a and the straight cut line shown in FIG. The description is omitted because it is symmetrical with respect to the line of sight 20b.

  The lower cut line 20c and the upper cut line 20d are curved so as to be gradually separated from the straight cut line 20b (rise angle is increased), and the straight cut line 20b is a tangent line. It connects with the end point of shape cut line 20b. Further, the curvature with respect to the straight cut line 20b is gentler at the lower cut line 20c than the upper cut line 20d (having a larger radius of curvature). For example, a straight line extending from the straight cut line 20b (one-dot chain line in FIG. 4). Are formed so that the maximum bulge amounts a1 and a2 are the same. Further, a projecting portion 23 that is curved in a direction approaching the upper score line 20d is formed at a substantially central portion of the lower score line 20c.

  The second cut line 21 formed on the back surface side film 3b constituting the packaging bag 1 extends from the two locations retracted inward (right side) from the outer edges of the left and right side seal parts 7 to the inner edge of the side seal parts 7. The two pairs of convergent cut lines 21a that converge in a direction that does not reach the inner edge of the side seal portion 7 and the converged cut line 21a converge to the left and right side seal portions 7 respectively. A straight cut line 21b that progresses in the direction perpendicular to the inside of the packaging bag 1, a lower cut line 21c that bulges toward the lower end side of the packaging bag 1 from an end point of the linear cut line 21b, and an upper cut line 21d that bulges toward the upper end side. Consists of Note that the convergent cut line 21a formed on the right side seal portion 7 and the straight cut line 21b continuous with the convergent cut line 21a are the left converged cut line 21a and the straight cut line shown in FIG. The description is omitted because it is symmetrical with the line of sight 21b.

  The configuration of the convergent cut line 21a and the straight cut line 21b is exactly the same as the configuration of the convergent cut line 20a and the straight cut line 20b of the first cut line 20. The convergent cut lines 20a and 21a and the straight cut lines 20b and 21b are formed so that the positions in the vertical direction of the packaging bag 1 (the distance from the outer edge of the upper seal portion 5) are equal and overlap in the front and back direction of the packaging bag 1. Has been.

  The lower cut line 21c and the upper cut line 21d have an arc shape that curves so as to gradually move away from the straight cut line 21b (the rising angle increases), and the straight line so that the straight cut line 21b is tangent. It connects with the end point of the shape cut line 21b. Further, the curvature with respect to the straight cut line 21b is gentler on the upper cut line 21d than on the lower cut line 21c (having a larger radius of curvature). Are formed so that the maximum bulge amounts a1 and a2 are the same. Further, a projecting portion 23 that is curved in a direction approaching the lower score line 21c is formed at a substantially central portion of the upper score line 21d. That is, the lower cut line 21c and the upper cut line 21d constituting the second cut line 21 are vertically symmetrical with the lower cut line 20c and the upper cut line 20d constituting the first cut line 20.

  Next, the opening method of the packaging bag 1 of this embodiment is demonstrated. First, the case where the front surface side film 3a is cut out in a state of facing the front will be described. When the upper portion of the opening notch 10 (the upper left end portion in FIG. 4) is gripped and torn toward the front side (the front side of the paper in FIG. 4), a pair of break lines are adjacent to the front end of the opening notch 10 It intersects with one of the convergent score lines 20a and 21a, and is integrally torn so that the convergent score line 20a intersected with the fracture line of the convergent score lines 20a and 21a coincides with the convergence point on the starting side. Or the break line directly reaches the convergence point on the origin side.

  And the surface side film 3a and the back surface side film 3b are torn linearly integrally along the linear score lines 20b and 21b continuing to the convergence points of the convergent score lines 20a and 21a, and the breaking line is at the lower end side. To the lower cut lines 20c and 21c that swell and the upper cut lines 20d and 21d that swell toward the upper end.

  When the front-side film 3a is cut in a state facing the front, a force at the time of opening is applied in the downward direction of the packaging bag 1, and therefore the lower cut line 20c and the upper cut line 20d at the first cut line 20. The lower cut line 20c is selected at the branching point, and the surface-side film 3a is broken along the lower cut line 20c.

  On the other hand, for the second cut line 21, the cut line with the smaller resistance at the time of opening is selected. That is, it is formed above the lower cut line 20c of the first cut line 20 at the branch point between the lower cut line 21c and the upper cut line 21d, and the curvature with respect to the straight cut line 21b is gentle. The upper cut line 21d is selected, and the back film 3b is broken along the upper cut line 21d.

  As described above, the upper end portion of the packaging bag 1 including the upper seal portion 5 can be cut cleanly along the first cut line 20 and the second cut line 21. FIG. 6 shows a state where the upper end portion of the packaging bag 1 including the upper seal portion 5 is completely cut off and the packaging bag 1 is opened. As shown in FIG. 6, the opening edge of the packaging bag 1 with the upper end portion cut off is the outer edge of the cut surface of the surface-side film 3a cut along the first cut line 20 (lower cut line 20c), and A step is formed on the outer edge of the cut surface of the back-side film 3b cut along the second cut line 21 (upper cut line 21d), and the opening edge can be easily widened by picking the step.

  Next, a case where the back film 3b is pushed out in a state where it is directed to the front will be described. When the upper portion of the opening notch 10 (the upper left end portion in FIG. 5) is gripped and torn to the back side (the back side of the paper surface in FIG. 5), a pair of break lines are adjacent to the front end of the opening notch 10 It intersects with one of the convergent score lines 20a and 21a, and is integrally torn so that the convergent score line 20a intersected with the fracture line of the convergent score lines 20a and 21a coincides with the convergence point on the starting side. Or the break line directly reaches the convergence point on the origin side.

  And the surface side film 3a and the back surface side film 3b are torn linearly integrally along the linear score lines 20b and 21b continuing to the convergence points of the convergent score lines 20a and 21a, and the breaking line is at the lower end side. To the lower cut lines 20c and 21c that swell and the upper cut lines 20d and 21d that swell toward the upper end.

  When the back side film 3a is pressed in a state facing the front, since the force at the time of opening is applied in the downward direction of the packaging bag 1, in the first cut line 20, the lower cut line 20c and the upper cut line 20d The lower cut line 20c is selected at the bifurcation point, and the surface film 3a is broken along the lower cut line 20c.

  On the other hand, for the second cut line 21, an upper cut line 21d having a gentle curvature with respect to the straight cut line 21b is selected mainly at a branch point between the lower cut line 21c and the upper cut line 21d, and the back surface side film 3b. Is broken along the upper score line 21d.

  As described above, the upper end portion of the packaging bag 1 including the upper seal portion 5 can be cut cleanly along the first cut line 20 and the second cut line 21. FIG. 7 shows a state where the upper end portion of the packaging bag 1 including the upper seal portion 5 is completely cut off and the packaging bag 1 is opened. As shown in FIG. 7, the opening edge of the packaging bag 1 with the upper end portion cut off is the outer edge of the cut surface of the surface-side film 3 a cut along the first cut line 20 (lower cut line 20 c), and A step is formed on the outer edge of the cut surface of the back-side film 3b cut along the second cut line 21 (upper cut line 21d), and the opening edge can be easily widened by picking the step.

  In addition, in the case where the back film 3a is pushed forward with the front side facing forward, a downward force is strongly applied when opening, so the second cut line 21 has a lower cut line 21c and an upper cut line. The lower cut line 21c may be selected at a branch point with 21d. However, as shown in FIG. 5, since the lower cut line 20c of the first cut line 20 has a gentler curvature than the lower cut line 21c of the second cut line 21, the lower cut line 20c is on the lower side. It is formed slightly above the cut line 21c. Therefore, it becomes difficult to become resistance when the packaging bag 1 is broken, and the surface side film 3a is smoothly broken along the lower cut line 20c.

  FIG. 8 shows a state in which the front side film 3a is broken along the lower cut line 20c, the back side film 3b is broken along the lower cut line 21c, and the packaging bag 1 is opened. As shown in FIG. 8, the opening edge of the packaging bag 1 with the upper end portion cut off is the outer edge of the cut surface of the surface-side film 3a cut along the first cut line 20 (lower cut line 20c), and On the outer edge of the cut surface of the back film 3b cut along the second cut line 21 (lower cut line 21c), a step is formed by the protruding portion 23 of the lower cut line 20c. The opening edge can be easily widened.

  In addition, as shown in FIG. 8, even when the lower cut line 20c, 21c is selected in both the first cut line 20 and the second cut line 21, the front side film 3a and the back side film 3b are surely attached. The maximum separation distance d (projection amount of the protrusion 23) between the lower cut line 20c constituting the first cut line 20 and the lower cut line 21c constituting the second cut line 21 is set to 2 mm so that a step is formed. It is preferable to set it as the above. Similarly, the maximum separation distance between the upper cut line 20d constituting the first cut line 20 and the upper cut line 21d constituting the second cut line 21 (the protruding amount of the protruding portion 23) is set to 2 mm or more. Even when the upper cut lines 20d and 21d are selected as both the cut line 20 and the second cut line 21, the protrusions 23 of the upper cut line 20c surely form a step on the front film 3a and the back film 3b. Is done.

  Next, the case where the back surface side film 3b is drawn in the state which faced the front is demonstrated. When the upper part of the opening notch 10 (the upper left end in FIG. 5) is gripped and torn to the near side (the front side of the paper in FIG. 5), a pair of break lines are inwardly adjacent to the tip of the opening notch 10 It intersects with one of the convergent score lines 20a and 21a, and is integrally torn so that the convergent score line 20a intersected with the fracture line of the convergent score lines 20a and 21a coincides with the convergence point on the starting side. Or the break line directly reaches the convergence point on the origin side.

  And the surface side film 3a and the back surface side film 3b are torn linearly integrally along the linear score lines 20b and 21b continuing to the convergence points of the convergent score lines 20a and 21a, and the breaking line is at the lower end side. To the lower cut lines 20c and 21c that swell and the upper cut lines 20d and 21d that swell toward the upper end.

  When the back film 3a is cut in the front direction, the opening force is applied in the downward direction of the packaging bag 1, so that the second cut line 21 has a lower cut line 21c and an upper cut line 21d. The lower cut line 21c is selected at the branching point, and the back film 3b is broken along the lower cut line 21c.

  On the other hand, in the first cut line 20, as shown in FIG. 5, both the lower cut line 20c and the upper cut line 20d are located above the lower cut line 21c. Therefore, even when either the lower cut line 20c or the upper cut line 20d is selected at the branch point between the lower cut line 20c and the upper cut line 20d, it is difficult to become resistance when breaking the packaging bag 1, The surface-side film 3a is broken along the lower score line 20c or the upper score line 20d.

  As described above, the upper end portion of the packaging bag 1 including the upper seal portion 5 can be cut cleanly along the first cut line 20 and the second cut line 21. 9 and 10 show a state in which the upper end portion of the packaging bag 1 including the upper seal portion 5 is completely cut off and the packaging bag 1 is opened. FIG. 9 shows a case where the surface-side film 3a is broken along the upper cut line 20d, and FIG. 10 shows a case where the surface-side film 3a is broken along the lower cut line 20c. As shown in FIG. 9 and FIG. 10, the opening edge of the packaging bag 1 with the upper end portion cut off is the surface side film cut along the first cut line 20 (upper cut line 20d or lower cut line 20c). Steps are formed on the outer edge of the cut surface of 3a and the outer edge of the cut surface of the back-side film 3b cut along the second cut line 21 (lower cut line 21c). Can be easily spread.

  Although not described in detail here, when the front side film 3a is pushed out in a state where it is directed to the front, since the force at the time of opening is applied in the downward direction of the packaging bag 1, the second cut of the back side film 3b is performed. The lower cut line 21c is selected for the line of sight 21, and either the lower cut line 20c or the upper cut line 20d positioned above the lower cut line 21c is selected for the first cut line 21 of the surface side film 3a. Selected. Therefore, when the back side film 3a is cut in a state facing the front, even when either the lower cut line 20c or the upper cut line 20d is selected, the packaging bag 1 is broken. It is difficult to become resistance, and the upper end portion of the packaging bag 1 including the upper seal portion 5 can be cut cleanly along the first cut line 20 and the second cut line 21. The state where the packaging bag 1 is opened is the same as in FIGS. 9 and 10.

  As described above, the packaging bag 1 according to the present embodiment has the upper seal portion 5 even when the front side film 3a or the back side film 3b is cut or pushed in a state facing the front. The upper end portion of the packaging bag 1 can be smoothly cut along the first cut line 20 and the second cut line 21. That is, the user can open the packaging bag 1 smoothly and cleanly with a light force along the first cut line 20 and the second cut line 21 regardless of the direction in which the user tries to open the packaging bag 1. Can do.

  In addition, even if any of the lower cut line 20c, the upper cut line 20d, the lower cut line 21c, and the upper cut line 21d of the second cut line 21 is selected, The opening edge of the packaging bag 1 is the outer edge of the cut surface of the surface side film 3a cut along the first cut line 20 and the outer edge of the cut surface of the back surface side film 3b cut along the second cut line 21. A step is formed. Thereby, it is possible to easily widen the opening by picking up the step, and it is easy to take out the contents, and it is also possible to suppress the adhesion of the contents to the fingers when the contents are taken out.

  Further, since the opening / closing chuck 9 is fixed below the opening edge, the packaging bag 1 can be easily resealed without using an adhesive tape, a clip, or the like. Accordingly, it is possible to sanitarily preserve the remaining contents by suppressing the ingress of moisture and dust into the packaging bag 1.

  FIG. 11 is a schematic diagram illustrating a manufacturing process of the packaging bag 1 of the present embodiment. The manufacturing method of the packaging bag 1 of this embodiment is demonstrated using FIG. First, the laminated film 3 having the configuration as shown in FIG. 3 is manufactured and wound into a roll.

  Next, the long laminated film 3 wound in a roll shape is sequentially fed out and cut with a slitter (not shown) while being folded in two in the longitudinal direction, and divided into a front side film 3a and a back side film 3b. To do. At this time, the inner layer 13 faces down in the front side film 3a, and the inner layer 13 faces up in the back side film 3b. In addition, you may pay | feed out the surface side film 3a and the back surface side film 3b previously slit by the predetermined width from a separate roll.

  Next, the long opening / closing chuck 9 wound in a roll shape is unwound and sandwiched at a predetermined position (the side where the opening end of the packaging bag 1 is formed) between the front surface side film 3a and the rear surface side film 3b. Then, heat sealing is performed by the first seal forming unit 31 including the heat seal bar 31a. The opening / closing chuck 7 includes an upper chuck 9a and a lower chuck 9b. By supplying the opening / closing chuck 9 in accordance with the arrangement of the heat seal bar 31a, the upper chuck 9a is applied to the front surface side film 3a and the lower chuck 9b is connected to the rear surface side. Heat sealed to the film 3b. Further, a heat insulating plate (not shown) is interposed between the upper chuck 9a and the lower chuck 9b, thereby preventing the heat fusion between the upper chuck 9a and the lower chuck 9b. Thereby, the front surface side film 3a, the back surface side film 3b, and the opening and closing chuck 9 can be heat-sealed continuously at the same time.

  Next, in the second seal forming part 32 provided with the heat seal bar 32a, the edge of the upper surface side film 3a and the rear surface side film 3b on the upper side of the opening and closing chuck 9 is continuously heat sealed, and the upper seal part 5 ( 1).

  Thereafter, the third seal forming portion 33 is heat-sealed at a predetermined interval in the long width direction to form the side seal portion 7, and the first cut line 20, respectively, on the front side film 3 a and the back side film 3 b, A second cut line 21 is formed, the notch 10 for opening is inserted into the side seal portion 7, and cut in the width direction along the side seal portion 7. As a heat sealing method in the third seal forming unit 33, for example, a known method such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

  In this manner, a semi-finished product of the packaging bag 1 is manufactured in which the side seal portion 7 and the upper seal portion 5 are formed on three sides while leaving the lower end portion as an unsealed portion. The formation position of the side seal portion 7 can be formed at a predetermined position by detecting an alignment mark (register mark) formed simultaneously with the printing layer of the front surface side film 3a or the back surface side film 3b.

  Finally, a predetermined amount of contents are filled from the unsealed portion into the storage portion 8, the unsealed portion is heat-sealed to form the lower seal portion 6, and the packaging bag 1 as shown in FIGS. To manufacture.

  The packaging bag 1 of the present invention thus obtained is used as a packaging material for food, cosmetics, detergents, pharmaceutical preparations and the like in liquid, gel, solid, and powder forms, and the contents can be taken out and resealed after opening. Therefore, it is possible to provide a packaging bag with significantly improved usability and cost.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the laminated structure of the front surface side film 3a and the back surface side film 3b shown in FIG. 3 is a preferable example, and may be a laminated structure including at least the outer layer 11, the intermediate layer 12, and the inner layer 13 made of a thermoplastic resin layer. . Moreover, in the said embodiment, the protrusion part 23 is set to the upper side cut line 21d of the lower side cut line 20c of the 1st cut line 20 formed in the surface side film 3a, and the 2nd cut line 21 formed in the back surface side film 3b. Although formed, the protrusion 23 may be formed on the upper cut line 20 d of the first cut line 20 and the lower cut line 21 c of the second cut line 21.

  Further, the packaging bag 1 of the present invention is not limited to the four-sided seal type as shown in the above-described embodiment. For example, the packaging bag 1 can be heat-sealed in various forms such as a three-sided seal type and a standing pouch type. Can be manufactured.

  Further, the above production method is only a preferred example. For example, as a production method of the front side film 3a and the back side film 3b, a lamination method used when producing an ordinary packaging material, for example, a wet lamination method, a solventless method, or the like. Lamination method, coextrusion lamination method, inflation method, and other methods can also be used.

  Further, when the above layers are laminated, if necessary, pretreatment such as anchor coating treatment, corona discharge treatment, ozone treatment, flame treatment, blast treatment, etc. can be optionally applied to the surface of the substrate to be laminated. . Hereinafter, the configuration of the present invention will be described more specifically using examples.

  (1) A uniaxially stretched polyethylene terephthalate film having a thickness of 12 μm is used as the outer layer 11, a printed layer (white solid layer) is formed on the surface of the outer layer 11 by gravure printing, and a dry laminate layer is further laminated. As the layer 23, an aluminum foil having a thickness of 9 μm was laminated. Furthermore, after laminating a dry laminate layer on the surface of the intermediate layer 12, a laminated film 3 was produced by laminating a low-density polyethylene film having a thickness of 40 μm as the inner layer 13.

  (2) The semi-finished product of the packaging bag 1 of the present embodiment by the manufacturing process shown in FIG. 11 using the laminated film 3 manufactured in (1) above and the opening / closing chuck 9 formed of stretched high-density polyethylene resin. (The lower end is an unsealed part). The packaging bag 1 has a length of 165 mm and a width of 100 mm. As shown in FIGS. 1 and 2, the surface-side film 3a is formed with a first cut line 20 branched into a lower cut line 20c and an upper cut line 20d. The back side film 3b is formed with a second cut line 21 branched into a lower cut line 21c and an upper cut line 21d.

Comparative example

The packaging bag 1 of the comparative example was manufactured by the manufacturing process similar to Example 1 using the laminated film 3 and the opening / closing chuck 9 used in the example. In the packaging bag 1 of the comparative example, a lower cut line 20c and a first cut line branched to an upper cut line 20d are formed on the front surface side film 3a, and the back side film 3b has one side seal portion 7 to the other side. A straight second cut line 21 is formed up to the side seal portion 7.
[Test example]

  The openability of the packaging bag 1 manufactured by the Example and the comparative example was evaluated. The evaluation method is that when the front side film 3a or the back side film 3b of the packaging bag 1 is cut or pressed in a state of facing the front, the sample is opened by 5 bags according to each opening condition. The feel at the time of opening was evaluated by visual observation of the opening. The evaluation criteria are: ◎ when opened without resistance along the shape of the cut line, ○ when there is resistance but opened along the shape of the cut line, part of the cut line regardless of the presence or absence of resistance △ when the step was not opened according to the shape but a step was formed at the opening edge, × when the step was not formed because the step was not formed at the opening edge, or when it was not opened along the shape of the cut line at all did. The evaluation results are shown in Table 1.

  Note that “upper and lower” in Table 1 indicates which of the upper cut line and the lower cut line is selected when the cut line branches vertically. For example, in the case of the packaging bag 1 of the embodiment (lower / upper), the lower cut line 20c of the first cut line 20 is selected in the front film 3a, and the upper side of the second cut line 21 in the back film 3b. It indicates that the cut line 21d has been selected.

  As is apparent from Table 1, in the packaging bag 1 of the example, the first cut line 20 and the second cut line 2 are the same even when the front side film 3a or the back side film 3b is drawn or pushed toward the front. It was opened without resistance along the shape of the cut line 21. On the other hand, in the packaging bag 1 of the comparative example, when the back side film 3b was drawn or pushed away toward the front, there were two bags that could not be opened smoothly due to resistance at the time of opening. There were 3 bags that were not formed and were difficult to pick or were not opened along the shape of the score line.

  INDUSTRIAL APPLICABILITY The present invention can be used for packaging bags that package food, cosmetics, pharmaceutical preparations, and the like in liquid, gel, solid, and powder forms as contents. By using the present invention, it is possible to provide a packaging bag that is excellent in sealing performance before opening and contents taking out at the time of opening, and that can be easily formed at low cost.

DESCRIPTION OF SYMBOLS 1 Package 3 Laminated film 3a Surface side film (1st film)
3b Back side film (second film)
5 Upper seal part 6 Lower seal part 7 Side seal part 8 Storage part 9 Opening and closing chuck (occlusion tool)
9a Upper chuck part (female member)
9b Lower chuck part (male member)
10 Opening notch (opening start means)
11 outer layer 12 middle layer 13 inner layer 20 first cut line 20a convergent cut line (first cut line)
20b Straight cut line (first cut line)
20c Lower cut line (first cut line)
20d Upper cut line (first cut line)
21 Second cut line 21a Converged cut line (second cut line)
21b Straight cut line (second cut line)
21c Lower cut line (second cut line)
21d Upper cut line (second cut line)
23 Protrusion

Claims (7)

Side seal portions are formed on the left and right side edges facing each other by overlapping the inner layers of the rectangular first film and the second film having at least an outer layer, an intermediate layer, and an inner layer made of a heat-adhesive resin. Form the
On the outer layer of the first film, the other side having the same vertical position parallel to the starting point and the side seal portion, starting from a position retracted inward from the outer edge of one of the side seal portions. Forming a first cut line that continues from the position retracted inward from the outer edge of the part seal part,
The other side of the second film having the same position in the vertical direction parallel to the start point and the side seal portion, starting from a position retracted inward from the outer edge of one of the side seal portions on the outer layer of the second film Forming a second cut line that continues from the position retracted inward from the outer edge of the part seal part,
The first cut line and the second cut line are substantially the same in the vertical position of the starting point and the end point, and the trajectory from the starting point to the end point is different. When the upper end side of the packaging bag is broken in a direction perpendicular to the left and right side seal portions along the second cut line to form an opening, one of the first film and the second film A packaging bag that creates a step between the outer edge of the cut surface and the outer edge of the other cut surface,
The first cut line and the second cut line are respectively
A pair of left and right linear cut lines that proceed inwardly from the position retracted inward from the outer edges of the left and right side seal parts, beyond the inner edge of the side seal parts;
A lower cut line that diverges in a curved line so that the rising angle gradually increases from the end of the pair of left and right straight cut lines and swells to the lower end side;
An upper cut line that diverges in a curved line so that the rising angle gradually increases from the end of the pair of left and right straight cut lines and swells to the upper end side;
Is formed in a bilaterally symmetric shape, and an opening start means is formed in an area from an outer edge of the side seal portion to the linear cut line,
One of the first cut line and the second cut line is formed with a projecting portion that protrudes in a curve so as to approach the upper cut line in a part of the lower cut line. The other side of the cut line or the second cut line is formed with a protruding portion that protrudes in a curved manner so as to approach the lower cut line at a part of the upper cut line. .   The first cut line and the second cut line proceed in a direction from the two positions retracted inward from the outer edges of the left and right side seal parts toward the inner edge of the side seal parts, and the side seal parts The packaging bag according to claim 1, wherein the packaging bag has a pair of converging cut lines that are converged on the outer side of the inner edge and continuous with the straight cut lines.   Of the lower cut line and the upper cut line constituting the first cut line, and the lower cut line and the upper cut line constituting the second cut line, the side on which the protruding portion is formed is The packaging bag according to claim 1 or 2, wherein a curvature with respect to the straight cut line is gentler than a side where the protruding portion is not formed.   The said lower side cut line and the said upper side cut line continue to the end point of the said linear cut line so that the said linear cut line may become a tangent, The Claim 1 thru | or 3 characterized by the above-mentioned. Packaging bags.   The packaging bag according to any one of claims 1 to 4, wherein the second cut line has a shape obtained by inverting the first cut line in a vertical direction.   The maximum separation distance between the lower cut line constituting the first cut line and the lower cut line constituting the second cut line, and the upper cut line and the second cut constituting the first cut line The packaging bag according to any one of claims 1 to 5, wherein a maximum separation distance between the upper cut lines constituting the line of sight is 2 mm or more. On the inner surfaces of the first film and the second film, a protruding male member and a female recess that mesh with each other at opposite positions on the lower end side of the first cut line and the second cut line. A synthetic resin bite made of members is provided,
The packaging bag according to any one of claims 1 to 6, further comprising a reseal function by engaging the male member and the female member.

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