JP5994621B2 - Method for manufacturing liquid storage bag and liquid storage bag - Google Patents

Description

  The present invention relates to a method of manufacturing a liquid storage bag provided with a spout portion formed integrally with a main body, and in particular, stably secures a liquid flow path when discharging the stored liquid. The present invention relates to a method of manufacturing a liquid storage bag capable of controlling the flow rate of liquid. The present invention also relates to a liquid containing bag.

  Liquid storage bags for storing liquid are required to be able to dispense liquid while maintaining a stable flow to the end. For this reason, conventionally, it has been proposed to attach a hollow cylindrical nozzle made of plastic or the like to the spout of a liquid container bag made of a soft resin film. However, when an additional member such as a hollow cylindrical nozzle is used, the member cost increases and an additional step for attaching the nozzle is required.

  In consideration of such problems, attempts have been made to ensure the stability of dispensing without using additional members. For example, Patent Document 1 proposes that a wide convex opening assist mechanism is formed on the front or back surface of the spout portion by embossing. In Patent Document 1, it is intended to prevent the spout portion from being blocked when liquid is poured out by forming a convex opening assist mechanism. It is also intended to facilitate the dispensing of a highly viscous liquid by increasing the cross-sectional area of the spout port.

Japanese Patent Laid-Open No. 11-20837

  In a liquid container bag made of a soft resin film, if the flow rate of the liquid becomes too large, the interval between the front surface and the back surface is widened, and as a result, the spout portion may be blocked. Therefore, in the liquid storage bag, it is important not only to ensure a stable liquid flow path but also to appropriately control the liquid flow rate so that the liquid flow rate does not become too large.

  An object of this invention is to provide the manufacturing method of a liquid storage bag which can solve such a subject effectively, and a liquid storage bag.

  The present invention is a method of manufacturing a liquid storage bag that has a front surface and a back surface and stores liquid, wherein the liquid storage bag is formed integrally with a main body portion that stores liquid, and the main body portion, A spout part extending along a pouring direction in which liquid is poured out, and both the front surface and the back surface are arranged on the inner side of the base film and the base film, and the tension of the base film A first embossed portion that protrudes outwardly from a flat portion on at least one of the front surface and the back surface, and a sealant film having a tensile elastic modulus smaller than the elastic modulus. The first embossed portion is formed with a top portion extending inside the outer contour along the outer contour of the first embossed portion in a plan view. An embossing step of embossing the laminated film using a step of preparing the laminated film including a material film and the sealant film, a male die including a convex portion, and a female die including a concave portion corresponding to the convex portion A portion of the first embossed portion from the outer shell to the top portion of the first embossed portion is referred to as a wall portion, and a portion surrounded by the wall portion of the first embossed portion is an intermediate portion. The embossing step is performed so that the wall portion is stretched and the intermediate portion is not stretched or stretched to a degree smaller than the extent of stretching in the wall portion. Is the method.

  The present invention is a liquid storage bag that has a front surface and a back surface and stores a liquid, and is formed integrally with the main body portion that stores the liquid, and along a dispensing direction in which the liquid is poured out. The surface and the back surface are both disposed inward of the base film and the base film, and have a tensile elastic modulus smaller than the tensile elastic modulus of the base film. A first embossed portion that protrudes outward from a flat portion is formed on at least one of the front surface and the back surface, and the first embossed The top portion is formed with a top portion extending inward of the outer contour along the outer contour of the first embossed portion in plan view, and of the first embossed portion, the top from the outer contour of the first embossed portion. When the portion up to this portion is referred to as a wall portion and the portion surrounded by the wall portion of the first embossed portion is referred to as an intermediate portion, the wall portion has a contour that protrudes outward, and the intermediate portion The part has a contour that protrudes inward, and the thickness of the laminated film in the wall part is a liquid containing bag that is smaller than the thickness of the laminated film in the intermediate part.

  In the liquid container bag according to the present invention, the thickness of the laminated film in the wall portion is preferably in the range of 60 to 90% of the thickness of the laminated film in the intermediate portion, and more preferably in the intermediate portion. It is in the range of 75 to 90% of the thickness of the laminated film.

  In the liquid container bag according to the present invention, the base film may be made of a stretched film.

  According to the present invention, in the first embossed portion, when the portion from the outline to the top of the first embossed portion is referred to as a wall portion, and the portion surrounded by the wall portion of the first embossed portion is referred to as an intermediate portion, The step is performed so that the wall portion is stretched and the intermediate portion is not stretched or is stretched to a degree smaller than the stretching in the wall portion. As a result, the first embossed portion can be formed so that the wall portion has a contour that is convex outward and the intermediate portion has a contour that is convex inward. For this reason, while being able to ensure the flow path of a liquid stably, the flow volume of a liquid can be controlled appropriately.

FIG. 1 is a plan view showing a liquid storage bag according to the first embodiment of the present invention. FIG. 2 is an enlarged plan view showing a spout portion and its vicinity of the liquid storage bag of FIG. 1. FIG. 3 is a cross-sectional view showing the liquid container bag of FIG. 2 as viewed from the III-III direction. FIG. 4 is a cross-sectional view showing the liquid container bag of FIG. 2 as viewed from the IV-IV direction. FIGS. 5A, 5 </ b> B, 5 </ b> C, 5 </ b> D, and 5 </ b> E are views showing an example of a method for forming the first embossed portion of the liquid containing bag according to the first embodiment of the present invention. FIG. 6 is a diagram for explaining stress applied to each film of the laminated film during embossing. 7A, 7B, 7C, and 7D are views showing an example of a method for forming an embossed portion of a liquid containing bag according to a comparative embodiment. FIG. 8 is a plan view showing a modification of the first embodiment of the present invention. FIG. 9 is a cross-sectional view showing a modification of the first embodiment of the present invention. FIG. 10 is a plan view showing a liquid storage bag according to the second embodiment of the present invention. FIG. 11 is a cross-sectional view illustrating the liquid storage bag of FIG. 10 as viewed from the XI-XI direction. 12 is a cross-sectional view showing the liquid container bag of FIG. 10 as viewed from the XII-XII direction. FIG. 13 is a plan view showing a modification of the second embodiment of the present invention. FIG. 14 is a cross-sectional view showing a modification of the second embodiment of the present invention.

First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. Note that, in the drawings attached to the present specification, for convenience of illustration and understanding, the scale and vertical / horizontal dimension ratios are appropriately changed and exaggerated from those of the actual ones.

  Further, terms used in the present specification for specifying shapes and geometric conditions, for example, terms such as “parallel”, “orthogonal”, “vertical bisector”, and “similarity” have strict meanings. Without being bound, the present invention is construed to allow an error within a range where the intended effect can be expected.

Liquid Storage Bag FIG. 1 is a plan view showing the entire liquid storage bag 10 according to the present embodiment. The liquid storage bag 10 having a front surface and a back surface is configured to store liquid that can be refilled into a bottle, such as liquid detergent or shampoo. In the following description and drawings, the liquid storage bag 10 is a liquid storage bag before the liquid is stored unless otherwise specified.

  As long as a spout portion 15 described later is formed, the type of the liquid storage bag 10 according to the present embodiment is not particularly limited. For example, in the liquid containing bag 10, a first sealant film 11b described later of the first laminated film 11 constituting the front surface and a second sealant film 12b described later of the second laminated film 12 constituting the back surface are joined to each other by heat sealing or the like. It is formed by. The position of the joint formed by heat sealing is not particularly limited. For example, the joint portion may be formed along three edges of the liquid storage bag 10, whereby the liquid storage bag 10 may be configured as a three-sided seal bag. Moreover, a junction part is formed along the four edge parts of the liquid storage bag 10, and, thereby, the liquid storage bag 10 may be comprised as a four-sided seal bag.

  The liquid storage bag 10 may be configured as a so-called gusset bag in which a gusset is provided between the front surface and the back surface. Such a gusset may be provided at the bottom 23 of the liquid containing bag 10 or may be provided at the side 22 of the liquid containing bag 10. For example, as shown in FIG. 1, the liquid storage bag 10 may further include a bottom surface 13 that is disposed between the front surface and the back surface and is folded inside. In FIG. 1, the fold line of the bottom surface 13 folded inward is indicated by reference numeral 13a. In this case, the above-described gusset is formed on the bottom 23 of the liquid containing bag 10. In the following description, a case will be described in which the liquid storage bag 10 is a so-called bottom gusset bag in which a gusset is formed on the bottom 23.

  As shown in FIG. 1, the liquid containing bag 10 includes a main body portion 14 and a spout portion 15 connected to the main body portion 14. In FIG. 1, a boundary between the main body portion 14 and the spout port portion 15 is virtually indicated by a boundary line 19. Hereinafter, the main body part 14 and the spout part 15 will be described.

(Main body)
The main body portion 14 is a portion for mainly storing liquid. The main body 14 includes a bottom 23 sealed by a bottom seal 23a, a pair of side parts 22 sealed by a side seal 22a, and an upper part 21. The upper part 21 is an opening 21b that is opened when the liquid containing bag 10 is filled with liquid. After the liquid storage bag 10 is filled with the liquid, the upper portion 21 is sealed by heat sealing or the like. In FIG. 1, a portion to be heat-sealed after being filled with a liquid is indicated by reference numeral 21a as an upper seal scheduled portion.

(Outlet part)
Next, the spout part 15 will be described. The spout part 15 is configured to extend along the pouring direction in which the liquid is poured out. By providing such a spout 15, the flow of liquid when being poured out from the liquid storage bag 10 can be adjusted, and thereby the refilling operation of the liquid can be facilitated. In the present embodiment, an example in which the direction in which the spout portion 15 extends is inclined with respect to both the direction in which the upper portion 21 and the side portion 22 of the main body portion 14 extend is shown. There is no limit. For example, the direction in which the spout part 15 extends may be parallel to the direction in which the upper part 21 or the side part 22 of the main body part 14 extends.

  The spout part 15 includes a scheduled opening part 16 that becomes a spout 16a through which liquid is poured out by opening. The opening scheduled portion 16 may be subjected to processing for making the liquid containing bag 10 easier to open. For example, the scheduled opening portion 16 may include a half cut line formed by laser processing, a cutter, or the like. Moreover, you may make the extending | stretching direction of the base films 11a and 12a mentioned later of the laminated | multilayer film 11 and 12 which comprise a surface and a back surface correspond with the direction where the opening scheduled part 16 extends. Further, a notch 17 may be formed at the end of the planned opening portion 16. Moreover, the display for showing to a user that it is an opening place may be provided in the scheduled opening part 16 by printing.

  A cutout may be formed on the side of the spout portion 15. For example, in the liquid storage bag 10 according to the present embodiment, notches are formed on both sides of the spout portion 15. Accordingly, the width of the liquid flow path can be changed at the boundary line 19 between the main body portion 14 and the spout port portion 15, whereby the spout port portion 15 regulates the liquid flow. Can be increased. Of the two notches, the notch formed on the upper portion 21 side is denoted by reference numeral 24, and the notch formed on the side portion 22 side is denoted by reference numeral 25.

  As shown in FIG. 1, the edge of the liquid storage bag 10 is heat-sealed also around the notches 24 and 25. In the following description, of the heat seal portions around the notches 24 and 25, a portion extending from the upper portion 21 toward the spout portion 15 is referred to as a first shoulder seal 24a, and from the side portion 22 to the spout portion 15. The portion extending toward the top is referred to as a second shoulder seal 25a. In this case, as shown in FIG. 1, a straight line connecting the end portion of the seal line inside the first shoulder seal 24a and the end portion of the seal line inside the second shoulder seal 25a is connected to the main body portion 14. It becomes the above-mentioned boundary line 19 with the spout part 15.

  Preferably, the first shoulder seal 24 a extends so as to be orthogonal to the opening 21 b of the upper portion 21. As a result, the degree of opening in the opening 21b can be further increased, thereby facilitating the operation of filling the main body 14 with the liquid via the opening 21b.

  As shown in FIG. 1, also in the spout part 15, the edge part is heat-sealed. In the following description, the heat seal portion in the spout portion 15 is referred to as a spout portion seal 15a.

(First embossed part)
Further, a first embossed portion 30 that protrudes outward from the flat portion is formed on the surface of the liquid containing bag 10. Although the place where the first embossed part 30 is formed is not particularly limited, for example, as shown in FIG. 1, the first embossed part 30 is perpendicular to the boundary line 19 between the main body part 14 and the spout part 15. It is provided so as to intersect with the bisector 18 at least at the main body portion 14. Hereinafter, the first embossed portion 30 will be described with reference to FIG. FIG. 2 is an enlarged plan view showing the spout 15 and the vicinity thereof of the liquid storage bag 10 of FIG.

  In the present specification, the terms “outward” and “inward” are used as terms representing the direction in the direction along the normal direction of the front surface or the back surface. Therefore, “outward” means a direction away from the front or back surface along the normal direction of the front or back surface. Here, the direction that the description “along the normal direction” means is not limited to a direction parallel to the normal direction, and is within a range where the operation and effect intended by the present embodiment can be expected. Interpreted to allow error. 3 and 4 are cross-sectional views showing the liquid container bag of FIG. 2 as viewed from the III-III and IV-IV directions. 3 and 4 show a state in which the first embossed portion 30 protrudes outward.

  Further, in this specification, the terms “outside” and “inside” are used as terms representing the orientation of the front surface 11 or the back surface 12 in the surface direction.

  The first convex portion 30 has a circular outline 30a that extends beyond the perpendicular bisector 18 in the vicinity of the boundary line 19 between the main body portion 14 and the spout portion 15 in a plan view. The first embossed portion 30 is formed with a top 33 extending along the outer shape 30 a of the first embossed portion 30 and extending inside the outer shape 30 a. In FIG. 2, the end portion of the first embossed portion 30 that is positioned closest to the main body portion 14 on the vertical bisector 18 is marked with a symbol T.

(Cross-sectional shape of the first embossed part)
Next, the cross-sectional shape of the first embossed portion 30 will be described with reference to FIGS. 3 and 4. FIG. 3 is a cross-sectional view showing a case where the liquid storage bag 10 is cut in a direction along the liquid dispensing direction. FIG. 4 is a cross-sectional view showing a case where the liquid containing bag 10 is cut along a line orthogonal to the vertical bisector 18. As shown in FIGS. 3 and 4, the surface of the liquid storage bag 10 is disposed on the inner side of the first base film 11 a and the first base film 11 a, that is, on the side facing the liquid to be stored. And a first laminated film 11 including one sealant film 11b. Similarly, the back surface of the liquid containing bag 10 is composed of a second laminated film 12 including a second base film 12a and a second sealant film 12b disposed inside the second base film 12a. Yes.

  In the present embodiment, of the first embossed portion 30, a portion from the outer shell 30 a to the top portion 33 of the first embossed portion 30 is referred to as a wall portion 31, and a portion surrounded by the wall portion 31 is referred to as an intermediate portion 32. . As shown in FIGS. 3 and 4, the wall portion 31 has a contour that is convex outward. Therefore, the shape of the wall portion 31 is easily held even when the liquid is poured out. That is, the wall part 31 has high shape retention property. On the other hand, since the intermediate part 32 is surrounded by the wall part 31 which has high shape retention property, it is easy to bend. Therefore, a recess is formed in the intermediate portion 32 at least when the liquid is poured out.

  The height h of the top portion 33 of the first embossed portion 30 is appropriately set according to the type of liquid to be accommodated and the size of the spout portion 15, but is within a range of, for example, 0.5 to 4.0 mm. Preferably, it exists in the range of 1.0-3.0 mm. The width k (see FIG. 2) of the intermediate portion 32 is preferably in the range of 10 to 20 mm. In addition, the width k of the intermediate part 32 is the maximum value of the space | interval between the opposing wall parts 31 in the direction along the pouring direction. For example, the width k is the width of the intermediate portion 32 when the intermediate portion 32 is cut along the vertical bisector 18.

Further, the thickness t ₁ of the first laminated film 11 in the wall portion 31 is smaller than the thickness t ₂ of the first laminated film 11 in the intermediate portion 32. Specifically, the thickness t ₁ of the first laminated film 11 in the wall portion 31 is in the range of 60 to 90% of the thickness t ₂ of the first laminated film 11 in the intermediate portion 32, and more preferably 75. It is in the range of ~ 90%. As will be described later, by embossing the first laminated film 11 so as to cause such a thickness difference, the shapes of the wall portion 31 and the intermediate portion 32 described above can be realized.

(First laminated film)
Hereinafter, the structure of the 1st laminated film 11 for implement | achieving the above-mentioned wall part 31 and the intermediate part 32 is demonstrated.

[First base film]
First, the first base film 11a of the first laminated film 11 will be described. The 1st base film 11a consists of a stretched film at least uniaxially stretched. As a material constituting the first base film 11a, for example, polyamide such as nylon (Ny) or polyethylene terephthalate (PET) can be used.

また、第１基材フィルム１１ａを構成する材料としてポリエチレンテレフタレートが用いられる場合、第１基材フィルム１１ａの厚みは１２〜２５μｍの範囲内となっている。このようなポリエチレンテレフタレートフィルムの具体例を、各フィルムの厚みおよび特性とともに表２に示す。

なお、第１基材フィルム１１ａは、複数のフィルムを組み合わせることにより構成されていてもよい。例えば、ナイロンフィルムとポリエチレンテレフタレートフィルムとを組み合わせることによって第１基材フィルム１１ａが構成されていてもよい。 The thickness of the 1st base film 11a is suitably set according to the material used. For example, when nylon is used as the material constituting the first base film 11a, the thickness of the first base film 11a is in the range of 15 to 25 μm. Specific examples of such nylon films are shown in Table 1 together with the thickness and characteristics of each film.

Moreover, when polyethylene terephthalate is used as the material constituting the first base film 11a, the thickness of the first base film 11a is in the range of 12 to 25 μm. Specific examples of such a polyethylene terephthalate film are shown in Table 2 together with the thickness and characteristics of each film.

In addition, the 1st base film 11a may be comprised by combining a some film. For example, the first base film 11a may be configured by combining a nylon film and a polyethylene terephthalate film.

[First sealant film]
Next, the first sealant film 11b of the first laminated film 11 will be described. The first sealant film 11b is a film serving as a sealant for joining the front and back surfaces of the liquid containing bag 10 together, and is made of a plastic film containing a thermoplastic resin. As a material constituting the first sealant film 11b, for example, polyethylene (PE) can be used. Here, polyethylene includes not only a homopolymer of ethylene but also a copolymer generally recognized as polyethylene, such as a copolymer of ethylene and an α-olefin monomer. The specific gravity of the polyethylene used in the first sealant film 11b is not particularly limited, and is high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE). Etc.) can be suitably used. In addition, the 1st sealant film 11b may be comprised by combining a some film.

  As the linear low density polyethylene, for example, metatheron linear low density polyethylene (m-LLDPE) can be used. METACELON linear low density polyethylene is a polymer polymerized using a metallocene catalyst. It is hard to block, has good sliding property, has little polyethylene odor, has few components eluted into food, EVA 10-15% Able to produce an ultra-low temperature heat-sealable film, excellent cold resistance and impact resistance, excellent hot tack, good contaminant sealability, good pinhole resistance against stagnation, few additives Therefore, it has characteristics such as that it is possible to produce a film having excellent transparency and that it has pressure strength and heat resistance.

  The thickness of the 1st sealant film 11b is set suitably according to the material used. For example, when polyethylene is used as the material constituting the first sealant film 11b, the thickness of the first sealant film 11b is preferably in the range of 20 to 200 μm, more preferably in the range of 30 to 130 μm. It has become.

  Next, the relationship between the characteristic of the 1st base film 11a and the characteristic of the 1st sealant film 11b is demonstrated. In this Embodiment, the 1st base film 11a and the 1st sealant film 11b are selected so that the shape of the above-mentioned wall part 31 can be implement | achieved when embossing is carried out. For example, when the tensile elastic modulus of the first base film 11a is K1 and the tensile elastic modulus of the first sealant film 11b is K2, K1 / K2 is preferably 2-40 so that at least K1 is larger than K2. The first base film 11a and the first sealant film 11b are selected so that K1 / K2 is within the range of 8 to 16, more preferably within the range of. By setting K1 and K2 in this way, as will be described later, the degree of deformation of the wall portion 31 reaches the plastic deformation region and the degree of deformation of the intermediate portion 32 does not reach the plastic deformation region, as will be described later. Can be implemented. In the present embodiment, as the tensile elastic modulus K1 and K2, for example, the tensile elastic modulus in the MD (Machine Direction) of the product film constituting each of the films 11a and 11b is used. A method for measuring the tensile elastic modulus is not particularly limited, and examples thereof include a tensile test performed based on a general standard such as JIS7127. As long as K1 is larger than K2, the specific values of K1 and K2 are not particularly limited. For example, the tensile modulus K1 of the first base film 11a is in the range of 1370-4800 MPa, and more preferably in the range of 1470-3920 MPa as shown in Tables 1 and 2. Moreover, the tensile elasticity modulus K2 of the 1st sealant film 11b exists in the range of 100-650 Mpa, More preferably, it is 300 Mpa or less, More preferably, it is 250 Mpa or less.

  Although not shown, the first laminated film 11 may further include an intermediate layer disposed between the first base film 11a and the first sealant film 11b. As an intermediate | middle layer, the barrier layer for improving the barrier property of the 1st laminated film 11 with respect to gas and a liquid is mentioned, for example. The specific configuration of the barrier layer is not particularly limited. For example, an aluminum vapor-deposited layer formed by vapor deposition, an ethylene-vinyl alcohol copolymer layer formed by coating, specifically, EVAL (EVOH), etc. Can be mentioned. The intermediate layer such as a barrier layer may be formed on the surface of the first base film 11a, or may be formed on the surface of the first sealant film 11b. Moreover, when the 1st base film 11a is comprised from the several film, the intermediate | middle layer may be provided between two adjacent films. Similarly, when the 1st sealant film 11b is comprised from the some film, the intermediate | middle layer may be provided between two adjacent films.

  The method for laminating the first base film 11a and the first sealant film 11b is not particularly limited, and a known laminating method is appropriately used. For example, a so-called dry laminating method in which the first base film 11a and the first sealant film 11b are bonded using an adhesive may be used. Further, a material such as polyethylene for forming the first sealant film 11b may be formed on the first base film 11a. For example, a so-called extrusion laminating method (EC method) in which a melted polyethylene extruded into a film shape is laminated on the first base film 11a may be used.

(Second laminated film)
As the 2nd base film 12a and the 2nd sealant film 12b of the 2nd lamination film 12, the same thing as the 1st base film 11a and the 1st sealant film 11b of the 1st lamination film 11 may be used. Similarly to the case of the first laminated film 11, the second laminated film 12 may further include other layers such as an intermediate layer.

  Next, the operation and effect of the present embodiment having such a configuration will be described. Here, first, a method for manufacturing the liquid containing bag 10 will be described. Next, the effect of the liquid storage bag 10 obtained when the liquid is poured out will be described.

(Manufacturing method of liquid container bag)
[Embossing method]
FIGS. 5A to 5E are views for explaining an embossing process for embossing the first laminated film 11 for constituting the surface. First, as shown in FIG. 5A, a male mold 50 including a convex portion 51 and a female mold 55 including a concave portion 57 corresponding to the convex portion 51 are prepared. In the male mold 50, the top surface 52 of the convex portion 51 has at least partially a curved shape. Further, the width w ₂ of the concave portion 57 of the female die 55 is larger than the width w ₁ of the convex portion 51 of the male die 50. Next, the first laminated film 11 is prepared between the male mold 50 and the female mold 55. Thereafter, as shown in FIG. 5B, the convex portion 51 of the male mold 50 is pushed into the concave portion 57 of the female mold 55, thereby embossing the first laminated film 11. The male mold 50 is pushed into the female mold 55 until the bite distance g (see FIG. 5C) between the male mold 50 and the female mold 55 reaches a predetermined value. The bite distance g is appropriately set according to the shape of the first embossed portion 30 and is, for example, in the range of 0.5 to 4.0 mm.

In the present embodiment, the male mold 50 and the female mold 55 are in contact with the top surface 52 of the convex portion 51 of the male mold 50 in the first laminated film 11 when the male mold 50 is pushed into the female mold 55. The portion of the first laminated film 11 that is in contact with the surface 56 of the female mold 55 is substantially fixed by the frictional force or the like. Therefore, in the present embodiment, the portion of the first laminated film 11 that is stretched during the embossing process is mainly located between the top surface 52 of the convex portion 51 of the male mold 50 and the surface 56 of the female mold 55. It becomes a part to do. That is, in the embossing process, the portion of the first laminated film 11 facing the convex portion 51 of the male mold 50 is not stretched uniformly but stretched locally. At this time, since the width w ₂ of the concave portion 57 of the female die 55 is wider than the width w ₁ of the convex portion 51 of the male die 50, the top surface 52 of the convex portion 51 of the male die 50 and the female die 55. The portion located between the surface 56 and the surface 56 can be easily stretched. Further, the width _{w 1} of the convex portion 51 of the male 50, the width _{w 2} of the recess 57 of the female mold 55 is wider, the first embossing 30 is tapered.

  The local stretching will be described in detail with reference to FIG. FIG. 5D is a diagram showing the first laminated film 11 in the state shown in FIG. 5C with the male mold 50 and the female mold 55 removed for convenience. As shown in FIG. 5 (d), the first laminated film 11 includes a wall portion 31 ′ positioned between the top surface 52 of the convex portion 51 of the male mold 50 and the surface 56 of the female mold 55, and a wall portion. A first embossed portion 30 ′ including an intermediate portion 32 ′ positioned between 31 ′ is formed. Here, as described above, during the embossing step, the portion of the first laminated film 11 that is in contact with the top surface 52 of the convex portion 51 of the male mold 50, that is, the intermediate portion 32 ′, and the female mold of the first laminated film 11. A portion in contact with the surface 56 of 55, that is, the flat portion 28 is substantially fixed by a frictional force or the like. For this reason, the intermediate portion 32 ′ and the flat portion 28 of the first laminated film 11 are not stretched so much during the embossing process. On the other hand, since the wall portion 31 ′ of the first laminated film 11 is not particularly fixed, the wall portion 31 ′ is stretched as the male mold 50 is pushed into the female mold 55. That is, the embossing step is performed so that the wall portion 31 ′ is stretched and the intermediate portion 32 ′ is not stretched or is stretched to a degree smaller than the extent of stretching in the wall portion 31 ′. More preferably, in the embossing step, the degree of deformation of the base film 11a of the wall 31 ′ reaches the plastic deformation region by appropriately adjusting the pushing speed and distance of the male mold 50 with respect to the female mold 55, and the wall. The degree of deformation of the sealant film 11b in the portion 31 ′ does not reach the plastic deformation region, and the degree of deformation of the base film 11a and the sealant film 11b in the intermediate portion 32 ′ does not reach the plastic deformation region. In this case, the shape retaining property of the wall part 31 and the controllability of the liquid flow rate can be further improved.

  For example, as shown in FIG. 6, in the embossing process, the maximum strain at the wall portion 31 ′ is larger than the strain at the upper yield point P1a of the stress-strain curve 11A of the first base film 11a, and at the intermediate portion 32 ′. The maximum strain is performed so as to be smaller than the strain at the upper yield point P1a. As a result, the first base film 11a of the first laminated film 11 in the wall portion 31 ′ is plastically deformed by the embossing process, but the first base film 11a of the first laminated film 11 in the intermediate portion 32 ′ is plastically deformed. Will not. In the embossing process, the maximum strain in the wall 31 ′ is “the strain at the upper yield point P1a of the stress-strain curve 11A of the first base film 11a to the upper yield point of the stress-strain curve 12A of the first sealant film 11b”. You may implement so that it may exist in the range R corresponding to "the distortion in P1b." In FIG. 6, symbols P2a and P3a indicate the lower yield point and the break point of the stress-strain curve 11A of the first base film 11a. Moreover, the code | symbol P2b has shown the falling yield point of the stress-strain curve 11B of the 1st sealant film 11b. In FIG. 6, a dotted line L1 is a straight line that passes through the origin and is in contact with the stress-strain curve 11A, and the inclination of the dotted line L1 represents the tensile elastic modulus K1 of the first base film 11a. Similarly, the dotted line L2 is a straight line that passes through the origin and is in contact with the stress-strain curve 11B, and the inclination of the dotted line L2 represents the tensile elastic modulus K2 of the first sealant film 11b. In the step of locally plastically deforming the first laminated film 11 shown in FIGS. 5B and 5C, the step of pushing the male die 50 into the female die 55 and the step of annealing the first laminated film 11 are performed. By repeating a plurality of times, the first laminated film 11 may be plastically deformed to a target strain.

Next, the effect of performing the embossing process as described above will be described.
As described above, the first base film 11a of the wall portion 31 ′ is plastically deformed by the embossing process. Further, as described above, the tensile elastic modulus K1 of the first base film 11a is larger than the tensile elastic modulus K2 of the first sealant film 11b. As a result, in the wall portion 31 ′, the first sealant film 11b is held in a state of being pulled by the first base film 11a. For this reason, the force which is going to shrink | contract has arisen in the 1st sealant film 11b as represented by the arrow in FIG.5 (d). In addition, as shown in FIG. 5A, since the embossing process is performed using the male mold 50 having a shape in which the top surface 52 of the convex portion 51 is curved, the intermediate portion of the first laminated film 11 is used. A force directed inward is generated at 32 '. As a result, when the first laminated film 11 is taken out from the male mold 50 and the female mold 55, the intermediate portion 32 ′ is deformed so as to have a convex outline inward as shown by an arrow in FIG. To do. As a result, an outward force acts on the wall portion 31 ′ of the first laminated film 11. Accordingly, as shown in FIG. 3, the first emboss 30 has a contour in which the wall portion 31 is convex outward, and a contour in which the intermediate portion 32 is convex inward. It becomes a shape.
Further, the wall portion 31 is smaller in thickness than the intermediate portion 32. For example, as described above, the thickness t ₁ of the first laminated film 11 in the wall portion 31 is in the range of 60 to 90% of the thickness t ₂ of the first laminated film 11 in the intermediate portion 32, and more preferably 75 to 90. %. By setting the thickness t ₁ to be 60% or more of the thickness t ₂ , the contour of the wall portion 31 can be stably held at a contour that is convex outward. Further, by making the thickness t ₁ and less than 90% of the thickness t _2, it is possible to ensure a bending easiness of the intermediate portion 32.

[Heat sealing method]
Then, the 2nd laminated film 12 for comprising a back surface is prepared. Next, the first laminated film 11 for the front surface and the second laminated film 12 for the back surface are opposed to each other, and the film for the bottom surface 13 is folded between the first laminated film 11 and the second laminated film 12. Insert between. Then, the edge part of each film is heat-sealed except for the part corresponding to the upper part 21. As a result, an intermediate product in which the side seal 22a, the bottom seal 23a, the first shoulder seal 24a, the second shoulder seal 25a, and the spout seal 15a are formed is obtained. Next, the intermediate product is punched along the outer shape of the liquid containing bag 10 to be produced. In this way, the liquid containing bag 10 having the opening 21b formed in the upper part 21 can be produced.

  Thereafter, liquid is filled into the main body 14 through the opening 21b, and then the upper part 21 is heat-sealed along the upper seal planned part 21a. As a result, it is possible to obtain the liquid containing bag 10 in which the liquid is sealed.

  According to the present embodiment, the first embossed portion 30 including the wall portion 31 having the contour that is convex outward and the intermediate portion 32 having the contour that is convex inward is formed. can do. For this reason, it is possible to appropriately control the flow rate of the liquid flowing from the main body portion 14 to the spout portion 15 while stably securing a liquid flow path from the main body portion 14 to the spout portion 15. Moreover, since the wall part 31 of the 1st embossed part 30 is extended | stretched, the shape retention property of the 1st embossed part 30 can be improved. Further, as described above, the first embossed portion 30 of the liquid containing bag 10 according to the present embodiment can be formed relatively easily and inexpensively by embossing. For this reason, according to this Embodiment, the liquid storage bag 10 which can implement | achieve the stable extraction of a liquid can be provided at low cost.

  Next, the effect of the present embodiment will be further described by comparing with a comparative embodiment. 7A, 7B, 7C, and 7D are views showing an example of a method for forming the embossed portion 72 of the laminated film 71 of the liquid containing bag according to the comparative embodiment.

  As shown to Fig.7 (a), the top surface 62 of the convex part 61 of the male type | mold 60 used in the comparison form has a curved shape. Further, in the female mold 65 used in the comparative embodiment, the shape of the boundary portion between the surface 66 and the recess 67 is a curved shape. For this reason, in the comparative form, when embossing the laminated film 71 as shown in FIGS. 7B and 7C, the portion of the laminated film 71 facing the convex portion 61 of the male mold 60 is stretched almost uniformly. It is thought that. As a result, as shown in FIG. 7D, the embossed portion 72 formed in the laminated film 71 has a substantially uniform thickness over the entire region. Accordingly, the embossed portion 72 is not formed with a depression like the above-described intermediate portion 32 in the present embodiment, and therefore, it is considered that the flow rate of the liquid cannot be appropriately controlled.

  On the other hand, according to this Embodiment, the 1st embossed part 30 provided with the above-mentioned wall part 31 and the intermediate part 32 can be formed by extending the 1st laminated film 11 locally in an embossing process. it can. For this reason, the liquid storage bag 10 which can implement | achieve the stable extraction | pouring of a liquid can be provided at low cost.

  Note that various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described with reference to the drawings. In the following description and the drawings used in the following description, the same reference numerals as those used for the corresponding parts in the above embodiment are used for the parts that can be configured in the same manner as in the above embodiment. A duplicate description is omitted.

(Modification of shape or arrangement of first embossed part)
In the above-described embodiment, the example in which the first embossed portion 30 has the circular outer shell 30a in plan view is shown. However, the present invention is not limited to this, and as shown in FIG. 8, the first embossed portion 30 may have an oval outline 30 a in plan view. In addition, the first embossed portion 30 may have an annular arc-shaped outer shell 30a in plan view. Although FIG. 8 shows an example in which the long side direction of the elliptical outline 30a is substantially parallel to the vertical bisector 18, the present invention is not limited to this. The long side direction of the oval outline 30 a may be substantially parallel to the boundary line 19, or may be inclined with respect to both the vertical bisector 18 and the boundary line 19.

  In the above-described embodiment, the example in which the first embossed portion 30 is disposed in the main body portion 14 has been shown. However, the present invention is not limited to this, and the first embossed portion 30 may extend across the main body portion 14 and the spout portion 15 as shown in FIG. Alternatively, the first embossed portion 30 may be disposed in the spout portion 15.

(Modification in which the first embossed portion is formed on the second laminated film)
Moreover, in the above-described embodiment, an example in which the first embossed portion 30 is formed only on the first laminated film 11 has been shown. However, the present invention is not limited to this, and the first embossed portion 30 may be formed on both the first laminated film 11 and the second laminated film 12 as shown in FIG. 9.

  In addition, although the some modification with respect to 1st Embodiment mentioned above has been demonstrated, naturally, it is also possible to apply combining several modifications suitably.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. The present embodiment shown in FIGS. 10 to 14 differs only in that the second embossed portion 40 is formed along the top portion 33 of the first embossed portion 30, and the other configurations are the same as those of the first embodiment described above. This is the same as the case of the embodiment. In the present embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, when it is clear that the effect obtained in the first embodiment can be obtained in the present embodiment, the description thereof may be omitted.

  FIG. 10 is a plan view showing the liquid storage bag 10 in the present embodiment. 11 and 12 are cross-sectional views showing the liquid containing bag of FIG. 10 as viewed from the XII-XII and XIII-XIII directions. 11 and 12 show a state in which the second embossed portion 40 protrudes outward from a bent portion 41 formed in the wall portion 31. FIG. By forming the second embossed portion 40 as described above, the shape retaining property of the wall portion 31 can be further enhanced. As a result, stable liquid dispensing can be realized more reliably.

  As long as the 2nd embossed part 40 is formed in any of the wall parts 31 which oppose along the extraction | pouring direction, the shape of the 2nd embossed part 40 in planar view is not specifically limited. For example, the 2nd embossing part 40 may be comprised as two protrusion parts which cross | intersect with respect to the extraction direction. Preferably, the shape of the second embossed portion 40 in plan view is similar to the outline 30 a of the first embossed portion 30.

(Modification)
Also in the present embodiment, the shapes of the first embossed portion 30 and the second embossed portion 40 in plan view are not particularly limited, and a circular shape, an elliptical shape, an annular arc shape, or the like can be appropriately employed. For example, as shown in FIG. 13, the first embossed portion 30 and the second embossed portion 40 may have an elliptical outline in plan view. Further, the arrangement of the first embossed portion 30 and the second embossed portion 40 is not particularly limited. For example, the 1st embossing part 30 and the 2nd embossing part 40 may be arrange | positioned in the main-body part 14, may be arrange | positioned ranging over the main-body part 14 and the spout part 15, or a spout part 15 may be arranged.

  Further, in the above-described embodiment, the example in which the first embossed portion 30 and the second embossed portion 40 are formed only on the first laminated film 11 has been shown. However, it is not restricted to this, As shown in FIG. 14, the 1st embossed part 30 and the 2nd embossed part 40 may be formed in both the 1st laminated film 11 and the 2nd laminated film 12. As shown in FIG.

  In addition, although some modified examples with respect to the above-described embodiment have been described, naturally, a plurality of modified examples can be applied in combination as appropriate.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to this Example.

Example 1
As a laminated film, it consists of the first base film 11a made of the above-mentioned nylon film (product name: emblem, model number: ON, thickness 15 μm) made by Unitika and a Tamapoly polyethylene film (model number: MZ-012, thickness 130 μm). A first laminated film 11 including a first sealant film 11b was prepared. Next, the 1st laminated | multilayer film 11 was embossed and the 1st embossed part 30 shown in FIG. 13 was formed. A second embossed portion 40 was further formed on the first embossed portion 30. Further, the first embossed portion 30 was formed so as to spread over the main body portion 14 and the spout portion 15. As the male mold 50 and the female mold 55 for forming the first embossed portion 30, the male mold 50 and the female mold 55 having an occlusal distance of 3 mm were used.

  The cross-sectional shapes of the three first embossed portions 30 were observed from the AA direction in FIG. 13 using a microscope. In addition, the thickness of the 1st laminated | multilayer film 11 before implementing embossing was 145 micrometers. The wall portion 31 after embossing has a thickness of 117 to 126 μm, and it can be confirmed that the thickness of the wall portion 31 in the vicinity of the second embossed portion 40 is 117 to 118 μm. It was. Since the wall part 31 deform | transforms largely compared with another part, it can be said that thickness became small compared with the other part.

DESCRIPTION OF SYMBOLS 10 Liquid storage bag 11 1st laminated | multilayer film 11a 1st base film 11b 1st sealant film 12 2nd laminated film 12a 2nd base film 12b 2nd sealant film 14 Main-body part 15 Outlet part 16 Opening planned part 18 Vertical 2 Equal line 19 Boundary line 24 Notch (upper side)
25 Notch (side)
28 Flat part 30 First embossed part 31 Wall part 32 Intermediate part 33 Top part 40 Second embossed part 50 Male 51 Protrusive part 53 Rib 55 Female mold 57 Concave part

Claims (5)

A method for producing a liquid containing bag having a front surface and a back surface and containing a liquid,
The liquid containing bag is
A main body for storing liquid;
A spout portion formed integrally with the main body portion and extending along a pouring direction in which liquid is poured out,
Each of the front surface and the back surface is composed of a laminated film including a base film and a sealant film that is disposed inward of the base film and has a tensile elastic modulus smaller than the tensile elastic modulus of the base film. Has been
At least one of the front surface and the back surface is formed with a first embossed portion protruding outward from the flat portion,
The first embossed portion is formed with a top portion extending inside the outer contour along the outer contour of the first embossed portion in plan view.
The manufacturing method of the liquid container bag is:
Preparing the laminated film including the base film and the sealant film;
An embossing step for embossing the laminated film using a male mold including a convex part and a female mold including a concave part corresponding to the convex part,
Of the first embossed part, when the part from the outline of the first embossed part to the top part is referred to as a wall part, and the part surrounded by the wall part of the first embossed part is referred to as an intermediate part, The embossing step is a method for manufacturing a liquid storage bag, wherein the wall portion is stretched and the intermediate portion is not stretched or is stretched to a degree smaller than the extent of stretching in the wall portion. A liquid containing bag having a front surface and a back surface and containing liquid,
A main body for storing liquid;
A spout portion formed integrally with the main body portion and extending along a pouring direction in which liquid is poured out,
Each of the front surface and the back surface is composed of a laminated film including a base film and a sealant film that is disposed inward of the base film and has a tensile elastic modulus smaller than the tensile elastic modulus of the base film. Has been
At least one of the front surface and the back surface is formed with a first embossed portion protruding outward from the flat portion,
The first embossed portion is formed with a top portion extending inside the outer contour along the outer contour of the first embossed portion in plan view.
Of the first embossed part, when the part from the outline of the first embossed part to the top part is referred to as a wall part, and the part surrounded by the wall part of the first embossed part is referred to as an intermediate part, The wall portion has a contour that is convex outward, and the intermediate portion has a contour that is convex inward,
The liquid containing bag, wherein a thickness of the laminated film in the wall portion is smaller than a thickness of the laminated film in the intermediate portion.   The liquid storage bag according to claim 2, wherein a thickness of the laminated film in the wall portion is in a range of 60 to 90% of a thickness of the laminated film in the intermediate portion.   The liquid storage bag according to claim 3, wherein the thickness of the laminated film in the wall portion is within a range of 75 to 90% of the thickness of the laminated film in the intermediate portion.   The liquid storage bag according to any one of claims 2 to 4, wherein the base film is made of a stretched film.

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