Plug, and pouch with plug

Abstract

To suppress poor appearance of a film.SOLUTION: A plug 10 made of high density polyethylene used in a pouch includes a flow channel 11 extending in a first direction D1, a pour-out part 12 which extends in the first direction D1 and forms a part of the flow channel 11, and a welding part 13 which extends in the first direction D1 and forms other part of the flow channel 11, wherein the welding part 13 has such a shape that thickness in a third direction D3 becomes smaller toward the end in a second direction D2 from the central part in the second direction D2. When an indenter 52 is pushed to the welding part 13 by 4.5 mm in the third direction D3, in a predetermined region exceeding a yield point of the welding part 13, an inclination S of a value obtained by dividing a load F of the indenter 52 by a contact area A between the welding part 13 and the indenter 52 to a push-in amount X of the indenter 52 is 2.30 N / mm3 or more.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a spout for use in a pouch and a spout-equipped pouch provided with said spout. [Background technology]

[0002] Conventionally, spouted pouches, in which a resin spout is welded to a pair of resin films, have been used as containers for accommodating liquids or other contents. In spouted pouches, a heated seal bar is pressed against the spout from above the film to melt the sealant layer of the film and the spout, thereby welding the film to the spout. Patent Document 1 describes a spout made of high-density polyethylene as the spout for such a spouted pouch. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2018-536591 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, efforts have been made to develop mono-material packaging materials to improve recyclability. The present inventors therefore produced plugs made of high-density polyethylene and evaluated the weldability of these plugs to polyethylene-based films, and found that some plugs caused poor appearance of the film in the vicinity of the plugs.

[0005] Therefore, an object of the present invention is to provide a stopper made of high-density polyethylene that can suppress poor appearance of a film, and a pouch with a stopper that includes the stopper. [Means for solving the problem]

[0006] The present inventors have further studied the above problem and have found the following. That is, when the seal bar is pressed against the plug in an inclined state when welding the film to the plug, the plug is excessively crushed, causing the seal bar to hit the film hard, which may cause the film to overheat and melt. It has also been found that if the film is overheated and melted when the seal bar is pressed against the plug multiple times, the film may stick to the seal bar and be welded at an unexpected location. From these findings, it has been found that by making the plug less likely to deform, it is possible to suppress poor appearance of the film even if the seal bar is pressed against the plug in an inclined state. The present invention has been made based on the above findings.

[0007] [1] A plug according to the present invention is a plug made of high-density polyethylene for use in a pouch, comprising a flow path extending in a first direction, a pouring portion extending in the first direction to form a part of the flow path, and a welded portion extending in the first direction to form another part of the flow path, wherein the welded portion has a shape in which its thickness in a third direction perpendicular to the first and second directions decreases from a center in a second direction perpendicular to the first direction to an end in the second direction, and wherein when an indenter is pressed 4.5 mm into the welded portion in the third direction, the slope of the value obtained by dividing the load of the indenter by the contact area between the welded portion and the indenter relative to the amount of pressing of the indenter in a predetermined region beyond the yield point of the welded portion is 2.30 N / mm 3 That's all.

[0008] In this plug, the slope of the value obtained by dividing the load of the indenter by the contact area between the welded part and the indenter with respect to the amount of indentation of the indenter in a specified area beyond the yield point of the welded part is 2.30 N / mm 3 As a result, when the seal bar is pressed against the welded portion in an inclined state, the welded portion is less likely to deform. As a result, even if the seal bar is pressed against the plug in an inclined state, the film is prevented from overheating and melting, and therefore defects in the appearance of the film can be prevented.

[0009] [2] In the plug described in [1] above, the melting point, which is the temperature at the apex of the endothermic peak in the DSC curve obtained by differential scanning calorimetry, may be 130.0° C. or lower. Since this plug has a melting point, which is the temperature at the apex of the endothermic peak in the DSC curve obtained by differential scanning calorimetry, of 130.0° C. or lower, when the plug is welded to a polyethylene film, the film can be prevented from being overheated and broken.

[0010] [3] The spouted pouch according to the present invention comprises a pouch body having a pair of films, and the spout according to [1] or [2] above, which is disposed between the pair of films and welded to the pair of films, each of which has a sealant layer containing polyethylene on its innermost surface. In this spouted pouch, since the spout is welded to the pair of films, even if the seal bar is pressed against the welded portion in an inclined state during the manufacture of the spouted pouch, the film can be prevented from overheating and melting. This can prevent the film from having poor appearance.

[0011] [4] In the spouted pouch described in [3] above, the seal strength between the welded portion of the spout and the sealant layer may be 25N or more. In this spouted pouch, the seal strength between the welded portion of the spout and the sealant layer is 25N or more, so that peeling of the film from the welded portion can be suppressed. Here, the seal strength between the welded portion and the sealant layer is determined by a combination of the temperature and pressure when welding the welded portion and the sealant layer, and the resistance to deformation of the welded portion. The more the welded portion is less likely to deform, the higher the seal strength between the welded portion and the sealant layer. In this spouted pouch, the welded portion is less likely to deform as described above, so that the seal strength between the welded portion and the sealant layer can be 25N or more even if the temperature and pressure conditions when welding the welded portion and the sealant layer change. Effect of the Invention

[0012] According to the present invention, defects in the appearance of the film can be suppressed. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a front view showing a spouted pouch according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view showing a portion of the body film. [Diagram 3] FIG. 2 is a diagram showing an example of a DSC curve obtained by differential scanning calorimetry of a stopper. [Figure 4] FIG. 2 is a perspective view showing a plug according to an embodiment. [Diagram 5] FIG. 2 is a front view showing the plug according to the embodiment. [Figure 6] FIG. 2 is a side view showing the plug according to the embodiment. [Figure 7] FIG. 2 is a bottom view showing the plug according to the embodiment. [Figure 8] 8 is a cross-sectional view taken along line VIII-VIII shown in FIG. 5. [Figure 9] FIG. 13 is a front view showing a state in which a push-in test is being performed. [Figure 10] 1 is a graph showing the measurement results of an indentation test. [Figure 11] FIG. 13 is a diagram for explaining a contact area. [Figure 12] 1 is a graph plotting the measurement results of an indentation test in Examples 1 to 5 and Comparative Example 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are designated by the same reference numerals, and duplicated description will be omitted.

[0015] (Pouch with stopper) FIG. 1 is a front view showing a spouted pouch according to an embodiment. The spouted pouch 1 shown in FIG. 1 is used for refilling contents into a container (not shown) such as a refill bottle, packaging beverages, packaging cosmetics, and the like. FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. 1. As shown in FIGS. 1 and 2, the spouted pouch 1 according to the embodiment includes a pouch body 2 and a spout 3. The spout is also called a spout or the like. The pouch body 2 includes a pair of resin films, a first body film 4A and a second body film 4B, opposed to each other, and a resin folding film 5 folded between the first body film 4A and the second body film 4B. The pouch body 2 may not include the folding film 5, or may further include another film.

[0016] The first and second body films 4A and 4B are heat-sealed (welded) to each other at their outer edges so as to form a storage area 6 for storing contents inside the spouted pouch 1, and the first and second body films 4A and 4B are heat-sealed to each other at their outer edges with the fold-out film 5. A spout 3 is disposed between the first and second body films 4A and 4B, and the outer edges of the first and second body films 4A and 4B are heat-sealed to the spout 3. The first and second body films 4A and 4B have the same shape, structure, etc. and are heat-sealed to the spout 3, and therefore, hereinafter, the first and second body films 4A and 4B will be collectively described as the body film 4 unless otherwise specified.

[0017] The trunk film 4 is formed of a laminate sheet in which a base layer 7 and a sealant layer 8 are laminated. The sealant layer 8 forms the innermost surface of the trunk film 4. In other words, the trunk film 4 has the sealant layer 8 on its innermost surface. The laminate sheet constituting the trunk film 4 may include layers other than the base layer 7 and the sealant layer 8. For example, the laminate sheet constituting the trunk film 4 may include a barrier layer disposed between the base layer 7 and the sealant layer 8.

[0018] The base layer 7 provides a predetermined rigidity to the body film 4 and has a barrier property that prevents the passage of gas and liquid. The material of the base layer 7 is not particularly limited, but may be, for example, polyolefin (e.g., polyethylene, very low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, or polypropylene) or polyester (e.g., polyethylene terephthalate). The density of very low density polyethylene is 0.900 g / cm. 3 The density of low density polyethylene is less than 0.900 g / cm 3 More than 0.925g / cm 3 The density of linear low density polyethylene is less than 0.900 g / cm 3 More than 0.925g / cm 3 The density of medium density polyethylene is less than 0.925 g / cm 3 More than 0.945g / cm 3 The density of high density polyethylene is less than 0.945 g / cm 3 or more than 0.945g / cm 3 More than 0.980g / cm 3 The following is the result.

[0019] The sealant layer 8 is a layer that can be melted to be welded to the plug 3. In other words, the sealant layer 8 is a layer that can be heat-sealed. The sealant layer 8 contains polyethylene. The polyethylene contained in the sealant layer 8 is not particularly limited, and can be, for example, very low density polyethylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, or high density polyethylene. Furthermore, the sealant layer 8 may contain polypropylene, polyester (e.g., polyethylene terephthalate), or the like, in addition to polyethylene.

[0020] The contents accommodated in the accommodation area 6 of the spouted pouch 1 are not particularly limited, but are preferably liquids. Examples of the contents include daily necessities such as liquid detergents, cleaning agents, medicines, cosmetics, shampoos, and conditioners, liquid seasonings, foods such as soups, yogurt, soft drinks, and edible oils, and industrial products such as lubricating oils and industrial oils. The spouted pouch 1 may be a pouch with a contents inlet plug in which the contents are accommodated in the accommodation area 6.

[0021] The plug 3 is made of high density polyethylene. Made of high density polyethylene means that the material constituting the plug 3 mainly contains high density polyethylene, and may contain other polymers such as medium density polyethylene and low density polyethylene, additives, etc. The weight percentage of high density polyethylene in the plug 3 is, for example, 80% or more, preferably 90% or more, and more preferably 95% or more.

[0022] In this embodiment, the melting point of the plug 3 is the temperature indicated by the apex of the endothermic peak in the DSC curve. That is, the temperature indicated by the apex of the endothermic peak in the DSC curve obtained by differential scanning calorimetry is defined as the melting point of the plug 3. The endothermic peak is a peak of heat absorption due to melting, and is also called a melting peak.

[0023] FIG. 3 is a diagram showing an example of a DSC curve obtained by differential scanning calorimetry of a plug. In FIG. 3, the vertical axis shows the heat flow of endotherm in an upward direction. In the example shown in FIG. 3, the temperature indicated by the apex P of the endothermic peak of the DSC curve is the melting point of the plug 3. The melting point of the plug 3 may be, for example, 133.0°C or lower, 130.0°C or lower, or 129.0°C or lower. The lower limit of the melting point of the plug 3 is not particularly limited, but may be, for example, 125.0°C or higher, or 127.0°C or higher.

[0024] The spout 3 has a flow path 31 for distributing the contents accommodated in the pouch body 2, a pouring portion 32 disposed on the outside of the pouch body 2 and forming a part of the flow path 31, a welded portion 33 welded to the body film 4 and forming another part of the flow path 31, and a flange portion 34 located between the pouring portion 32 and the welded portion 33. Details of the spout 3 will be described later.

[0025] (Plug) Next, the plug according to the embodiment will be described. FIG. 4 is a perspective view showing the plug according to the embodiment. FIG. 5 is a front view showing the plug according to the embodiment. FIG. 6 is a side view showing the plug according to the embodiment. FIG. 7 is a bottom view showing the plug according to the embodiment. FIG. 8 is a cross-sectional view taken along line VIII-VIII shown in FIG. 5. As shown in FIGS. 4 to 8, the plug 10 according to the embodiment is a plug that serves as the plug 3 of the spouted pouch 1 shown in FIGS. 1 and 2. That is, the plug 10 shown in FIGS. 4 to 8 becomes the plug 3 of the spouted pouch 1 shown in FIGS. 1 and 2 by being heat-sealed to the body film 4. For this reason, the material of the plug 10, the density of the resin constituting the plug 10, and the like can be made similar to those of the plug 3 of the spouted pouch 1.

[0026] The plug 10 includes a flow path 11, a spout portion 12, a welded portion 13, and a flange portion 14.

[0027] The flow path 11 extends in a first direction D1 and penetrates the spout 10 to allow the content contained in the containing area 6 of the spouted pouch 1 to flow. In other words, the flow path 11 is a hole defined by the inner circumferential surfaces of the pouring portion 12, the welded portion 13, and the flange portion 14, and is a through hole that penetrates the spout 10 in the first direction D1.

[0028] The spouting portion 12 is disposed outside the pouch body 2 of the spouted pouch 1, and is a portion for spouting the contents accommodated in the accommodation area 6 of the spouted pouch 1. The spouting portion 12 extends in a first direction D1, and forms a part of the flow path 11. The spouting portion 12 is formed in a cylindrical shape. The flow path 11 is formed on the inner peripheral surface of the spouting portion 12, and a screw portion 12a for detachably attaching a cap (not shown) is formed on the outer peripheral surface of the spouting portion 12. The cap is a member that closes the flow path 11 in an openable and closable manner.

[0029] The welded portion 13 is a portion that is welded to the body film 4. In other words, the welded portion 13 is disposed between the first body film 4A and the second body film 4B, and is a portion that is welded to the first body film 4A and the second body film 4B. The welded portion 13 extends in the first direction D1 and forms another part of the flow path 11.

[0030] The flange portion 14 is a flange-shaped portion located between the pouring portion 12 and the welding portion 13. The flange portion 14 is disposed on the outside of the pouch body 2 of the spouted pouch 1 and extends in a direction perpendicular to the first direction D1. The flange portion 14 is used, for example, to position the welding portion 13 relative to the body film 4. Note that, although only one flange portion 14 is provided in this embodiment, a plurality of flange portions 14 may be provided in the first direction D1.

[0031] The welded portion 13 has a shape in which the thickness in a third direction D3 perpendicular to the first direction D1 and the second direction D2 becomes thinner from the center in the second direction D2 perpendicular to the first direction D1 toward the end of the second direction D2. That is, the welded portion 13 has a cross section perpendicular to the first direction D1 that is substantially rhombic, and is longer in the second direction D2 than in the third direction D3. The outer surface of the welded portion 13 extends in a curved shape, for example, from the center in the second direction D2 toward the end of the second direction D2.

[0032] The welded portion 13 has a first side wall portion 16A welded to the first body film 4A and a second side wall portion 16B welded to the second body film 4B. The first side wall portion 16A and the second side wall portion 16B are positioned to face each other in the third direction D3, and are connected to each other at both ends in the second direction D2 so as to form an acute angle. Note that the first side wall portion 16A and the second side wall portion 16B have the same shape, structure, etc., and therefore, hereinafter, the first side wall portion 16A and the second side wall portion 16B will be collectively described as the side wall portion 16 unless otherwise specified.

[0033] For example, grooves 18 and ribs 19 may be formed in the side wall portion 16 of the welded portion 13. The grooves 18 are portions recessed from the outer surface of the side wall portion 16. The ribs 19 are portions protruding from the outer surface of the side wall portion 16. When the grooves 18 are formed in the side wall portion 16 of the welded portion 13, the number, size, shape, position, etc. of the grooves 18 are not particularly limited. Furthermore, when the ribs 19 are formed in the side wall portion 16 of the welded portion 13, the number, size, shape, position, etc. of the ribs 19 are not particularly limited.

[0034] When manufacturing a spouted pouch 1 using the spout 10 configured in this manner, first, a pouch intermediate (not shown) is prepared in which the first body film 4A and the second body film 4B are not heat-sealed to each other at the upper edge portions in the pouch body 2. Next, a preheating step is performed. In the preheating step, a heated seal bar (not shown) is pressed against the welded portion 13 to preheat the welded portion 13. If a rib 19 is formed in the welded portion 13, the rib 19 becomes a flat surface along the surface of the side wall portion 16 by being crushed by the seal bar in the preheating step or the next heat sealing. Next, the welded portion 13 of the spout 10 is disposed between the upper edge portion of the first body film 4A and the upper edge portion of the second body film 4B. Next, a heat sealing step is performed. In the heat sealing step, a heated seal bar is pressed against the welded portion 13 from above the first body film 4A and the second body film 4B. Then, the sealant layer 8 of the first body film 4A and the second body film 4B melts, and the welded portion 13 of the spout 10 melts, and the sealant layer 8 of the first body film 4A and the second body film 4B is welded to the welded portion 13 of the spout 10. As a result, the first body film 4A and the second body film 4B are welded to the welded portion 13. The heat sealing process can be performed multiple times, for example, twice. The preheating process is not necessarily performed, but it is preferable to perform the preheating process from the viewpoint of appropriately melting the welded portion 13. If the preheating process is not performed, the melting of the welded portion 13 in the preheating process occurs in the heat sealing process. Next, a cooling process is performed. In the cooling process, the first body film 4A, the second body film 4B, and the welded portion 13 are cooled. As a result, the first body film 4A and the second body film 4B are completely welded to the welded portion 13, and the above-mentioned spout-equipped pouch 1 is manufactured.

[0035] Incidentally, if the seal bar is pressed against the welded portion 13 of the plug 10 in an inclined state during the heat sealing process, the welded portion 13 is excessively crushed, causing the seal bar to hit the first body film 4A and the second body film 4B hard, which may cause the first body film 4A and the second body film 4B to overheat and melt. In addition, if the first body film 4A and the second body film 4B are overheated and melted when the heat sealing process is performed multiple times, the first body film 4A and the second body film 4B may stick to the seal bar and weld at unexpected places. As a result, the first body film 4A and the second body film 4B may have a poor appearance.

[0036] Therefore, in this embodiment, when the seal bar is pressed against the welded portion 13 in an inclined state, the welded portion 13 is made less likely to deform. That is, when the indenter 52 (see FIG. 9 ) is pressed 4.5 mm into the welded portion 13 in the third direction D3, the load F [N] of the indenter 52 with respect to the pressing amount X [mm] of the indenter 52 in a predetermined region exceeding the yield point of the welded portion 13 is calculated based on the contact area A [mm] between the welded portion 13 and the indenter 52. 2 ] divided by (F / A) slope S [N / mm 3 ] is 2.30N / mm 3 In other words, the slope S is the slope of a graph with the load F divided by the contact area A (F / A) on the vertical axis and the amount of compression X on the horizontal axis, and the slope of this graph is 2.30N / mm 3 or more. The slope S is also a value obtained by dividing the change Δ(F / A) in the value (F / A) obtained by dividing the load F by the contact area A in a predetermined region beyond the yield point of the welded portion 13 when the indenter 52 is pressed 4.5 mm into the welded portion 13 in the third direction D3, by the change ΔX in the pressing amount X. The load F is the force applied to the indenter 52 to press the indenter 52 into the welded portion 13. The pressing amount X is the pressing amount of the indenter 52 into the welded portion 13. In this case, the slope S is 2.40 N / mm 3 It may be 2.5N / mm or more. 3 The upper limit of the slope S in the predetermined region exceeding the yield point of the welded portion 13 is not particularly limited, but may be, for example, 10 N / mm 3It can be as follows:

[0037] Next, a method for determining the slope S will be described. First, an indentation test is performed. FIG. 9 is a front view showing the state in which the indentation test is being performed. As shown in FIG. 9, in the indentation test, a mounting table 50 is prepared for mounting the welded portion 13. Mounting table 50 is formed with a mounting surface 51 shaped to fit the outer surface of welded portion 13. Then, welded portion 13 is mounted on mounting surface 51 of mounting table 50.

[0038] Next, the indenter 52 is pressed into the welded portion 13 using a force gauge EMX series EMX-500N manufactured by Imada Co., Ltd., and the load F of the indenter 52 and the indentation amount X of the indenter 52 are measured. The indenter 52 is pressed into the welded portion 13 at a pressing speed of 20 mm / min and a maximum pressing amount of 4.5 mm by pressing the indenter 52 in the third direction D3 into the center of the welded portion 13 in the second direction D2. The pressing surface 53 of the indenter 52 is a circle with a diameter of 10 mm. As the indenter 52, for example, a metal indenter with a disk shape and a diameter of 10 mm is used. An example of the measurement results of the indentation test is shown in FIG. 10. In FIG. 10, the vertical axis represents the value (F / A) obtained by dividing the load F by the contact area A, and the horizontal axis represents the indentation amount X.

[0039] Here, the welded portion 13 is made of high-density polyethylene and has a complex shape in which the thickness in the third direction D3 decreases from the center in the second direction D2 toward the end in the second direction D2. Therefore, when the indenter 52 is pressed into the welded portion 13 in the third direction D3, the contact area between the welded portion 13 and the indenter 52 changes (increases). Therefore, as shown in FIG. 11, the area of ​​the surface where the welded portion 13 and the indenter 52 finally come into contact when the indenter 52 is pressed 5.4 mm into the welded portion 13 in the third direction D3 is defined as the contact area A between the welded portion 13 and the indenter 52. The contact area A is also the maximum contact area between the welded portion 13 and the indenter 52 when the indenter 52 is pressed 5.4 mm into the welded portion 13 in the third direction D3.

[0040] FIG. 11 is a diagram for explaining the contact area, and shows a state in which the indenter 52 is pressed 5.4 mm into the welded portion 13 in the third direction D3. In FIG. 11, the area of ​​the region hatched with oblique lines is the contact area A. In the case where the side wall portion 16 of the welded portion 13 does not have the groove 18 and the rib 19, the contact area A is the area of ​​a projection surface of the pressing surface 53 of the indenter 52 projected onto the welded portion 13 in the third direction D3. As shown in FIG. 11, in the case where the side wall portion 16 of the welded portion 13 has the rib 19, when the indenter 52 is pressed into the welded portion 13, the rib 19 is crushed, and the indenter 52 comes into contact with both the rib 19 and the side wall portion 16. Therefore, the contact area A is the area including the region corresponding to the rib 19 in the projection surface of the pressing surface 53 of the indenter 52 projected onto the welded portion 13 in the third direction D3. On the other hand, when groove 18 is formed in side wall portion 16 of welded portion 13, even if indenter 52 is pressed into welded portion 13, groove 18 sinks together with side wall portion 16, and therefore indenter 52 does not come into contact with groove 18. For this reason, contact area A is the area of ​​the projection surface of indenter 52 projected onto welded portion 13 in third direction D3, excluding the region corresponding to groove 18.

[0041] As shown in Fig. 10, in the elastic region before the yield point is reached, when indenter 52 is pressed into welded portion 13, slope S, which is the slope of the line shown in Fig. 10, changes. On the other hand, in the plastic region beyond the yield point, even if indenter 52 is pressed into welded portion 13, slope S, which is the slope of the line shown in Fig. 10, is unlikely to change.

[0042] Therefore, the slope S is calculated in a predetermined region beyond the yield point of the welded portion 13, which is the plastic region. In this embodiment, the calculated slope S is 2.30 N / mm 3 More than 2.40N / mm 3 or more than 2.50N / mm 3The predetermined region is not particularly limited, but may be, for example, a region beyond the yield point of the welded portion 13 where the slope S is constant, or, among a plurality of sections obtained by dividing the amount of push-in X into 0.5 mm intervals, a section that does not include the yield point but is closest to the yield point among the regions beyond the yield point of the welded portion 13 may be the predetermined region. In this case, in FIG. 10, the section where the amount of push-in X is 1.00 mm to 1.50 mm is the predetermined region. Then, the slope S is calculated in this predetermined region, and the calculated slope S is 2.30 N / mm 3 More than 2.40N / mm 3 or more than 2.50N / mm 3 That's all.

[0043] As described above, in the plug 10 according to this embodiment, the slope S in a predetermined region exceeding the yield point of the welded portion 13 is 2.30 N / mm 3 More than 2.40N / mm 3 or more than 2.50N / mm 3 As a result, when the seal bar is pressed against the welded portion 13 in an inclined state, the welded portion 13 is unlikely to be deformed. As a result, even if the seal bar is pressed against the plug 10 in an inclined state, the first body film 4A and the second body film 4B can be prevented from being overheated and melted, and therefore poor appearance of the first body film 4A and the second body film 4B can be prevented.

[0044] Furthermore, the melting point of this plug 10, which is indicated by the temperature of the apex P of the endothermic peak in the DSC curve obtained by differential scanning calorimetry, is 133.0°C or lower, 130.0°C or lower, or 129.0°C or lower, so that when the plug 10 is welded to the polyethylene-based first body film 4A and second body film 4B, the first body film 4A and second body film 4B can be prevented from being overheated and breaking.

[0045] In the spouted pouch 1 according to this embodiment, the spout 10 is welded to the first body film 4A and the second body film 4B, so that even if the seal bar is pressed against the welded portion 13 of the spout 10 in an inclined state during the manufacture of the spouted pouch 1, the first body film 4A and the second body film 4B can be prevented from being overheated and melted. This makes it possible to prevent poor appearance of the first body film 4A and the second body film 4B.

[0046] Furthermore, in this spouted pouch 1, the seal strength between the welded portion 33 of the spout 3 and the sealant layer 8 of the body film 4 is 25 N or more, 30 N or more, or 35 N or more, so peeling of the body film 4 from the welded portion 33 can be suppressed. Here, the seal strength between the welded portion 33 and the sealant layer 8 is determined by a combination of the temperature and pressure when the welded portion 13 of the spout 10 and the sealant layer 8 are welded together, and the resistance to deformation of the welded portion 13 of the spout 10. The more difficult the welded portion 13 of the spout 10 is to deformation, the higher the seal strength between the welded portion 33 and the sealant layer 8. In this spout-equipped pouch 1, the spout 10 is welded to the body film 4, so even if the temperature and pressure conditions change when welding the welded portion 13 of the spout 10 to the sealant layer 8, the seal strength between the welded portion 33 and the sealant layer 8 can be made 25 N or more, 30 N or more, or 35 N or more.

[0047] Although an embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and may be modified or applied to other things without departing from the gist of the claims. EXAMPLES

[0048] Next, examples of the present invention will be described, but the present invention is not limited to the following examples.

[0049] (Preparation of Laminate) The following materials were used to make the laminate: Base layer: Unstretched HDPE film (thickness: 35 μm, density: 0.948 g / cm 3, melting point: 135℃) Adhesive layer: Urethane adhesive First sealing layer: Low temperature sealable LLDPE (density: 0.916g / cm 3 , MFR: 4.0g / 10min, Melting point: 102℃) Second sealing layer: Anti-adhesion VLDPE (density: 0.913g / cm 3 , MFR: 10.0g / 10min, Melting point: 104℃)

[0050] A first seal layer (thickness: 80 μm) was provided on the surface of the support film. A second seal layer (thickness: 20 μm) was provided on the surface of this first seal layer to obtain a sealant layer with a two-layer structure. This sealant layer and the base layer were bonded together via an adhesive layer (thickness: 1 to 2 μm) to obtain a laminate. After the base layer and the sealant layer were bonded together, the support film was peeled off.

[0051] (Making the plug) Density 0.955g / cm 3 The plug of Example 1 was made of high density polyethylene (HDPE) having a density of 0.953 g / cm 3 The plug of Example 2 was made of high-density polyethylene having a density of 0.951 g / cm 3 The plug of Example 3 was made of high-density polyethylene having a density of 0.964 g / cm 3 The plug of Example 4 was made of high-density polyethylene having a density of 0.955 g / cm 3 High density polyethylene with a density of 0.902 g / cm 3 Engage 8480 (manufactured by The Dow Chemical Company) was added to produce the plug of Example 5. 3The plug of Comparative Example 1 was produced from the high-density polyethylene. All of the plugs of Examples 1 to 5 and Comparative Example 1 had a flow path extending in a first direction, a pouring portion extending in the first direction to form a part of the flow path, and a welded portion extending in the first direction to form another part of the flow path, and the welded portion had a shape in which the thickness in a third direction perpendicular to the first and second directions became thinner from a center in a second direction perpendicular to the first direction to an end in the second direction.

[0052] (Melt point measurement) The melting point of each plug was measured. In the measurement of the melting point, the differential scanning calorimetry of each plug was measured twice using a differential scanning calorimeter (DSC8000, manufactured by PerkinElmer). In the first differential scanning calorimetry, the thermal history at the time of the production of the plug may remain, so the temperature at the apex of the endothermic peak of the DSC curve obtained in the second differential scanning calorimetry was taken as the melting point of each plug. The melting point of the plug of Example 1 was 128.23°C. The melting point of the plug of Example 2 was 132.06°C. The melting point of the plug of Example 3 was 128.33°C. The melting point of the plug of Example 4 was 128.08°C. The melting point of the plug of Example 5 was 128.22°C. The melting point of the plug of Comparative Example 1 was 129.75°C.

[0053] (Indentation test) A push-in test was performed on each plug. In the push-in test, a mounting table was prepared for mounting the welded portion of each plug. The mounting table had a mounting surface formed in a shape that conformed to the outer surface of the welded portion of each plug. Then, after the welded portion of each plug was mounted on the mounting surface of the mounting table, a metal disk-shaped indenter with a diameter of 10 mm was pressed into the welded portion of each plug using a force gauge EMX series EMX-500N manufactured by IMADA Co., Ltd., and the load F of the indenter and the indenter push-in amount X at that time were measured. The indenter was pressed into the welded portion by pressing the indenter in the third direction into the center of the welded portion in the second direction under the conditions of a push-in speed of 20 mm / min and a maximum push-in amount of 4.5 mm. The indenter push-in surface was a circle with a diameter of 10 mm.

[0054] (Calculation of slope S) FIG. 12 is a graph plotting the measurement results of the indentation test in Examples 1 to 5 and Comparative Example 1. As shown in FIG. 12, the measurement results of the indentation test were plotted on a graph with the indenter load F divided by the contact area A between the welded portion and the indenter (F / A) on the vertical axis and the indenter indentation amount X on the horizontal axis. The contact area A was defined as the area of ​​the surface where the welded portion and the indenter finally come into contact when the indenter is pressed 5.4 mm into the welded portion in the third direction. In the graph plotting the measurement results of the indentation test, among a plurality of sections divided at 0.5 mm intervals in the indenter indentation amount X, the section that does not include the yield point and is closest to the yield point among the regions that exceed the yield point of the welded portion was defined as the predetermined region. This predetermined region was a section where the indenter indentation amount X was 1.00 mm to 1.50 mm. Then, for each plug, the slope S of the value (F / A) obtained by dividing the load F of the indenter 52 by the contact area A between the welded portion 13 and the indenter 52 relative to the amount of depression X of the indenter 52 in this specified region was calculated. The slope S was determined as the value obtained by dividing the amount of change Δ(F / A) in the value (F / A) obtained by dividing the load F by the contact area A in this specified region by the amount of change ΔX in the amount of depression X. The calculation results are shown in Table 1.

[0055] [Table 1]

[0056] (Sample Preparation) A pair of laminates was welded to each plug by heat sealing using a welding machine manufactured by Totani Giken Kogyo Co., Ltd., to obtain samples of Examples 1 to 5 and Comparative Example 1. In this heat sealing, the welded part was preheated under the conditions of temperature: 150°C, time: 0.9 sec, and pressure: 0.6 MPa, and then stored in a thermostatic chamber under the conditions of temperature: 100°C, time: 10 min. Thereafter, the welded part was placed between the pair of laminates, and primary sealing was performed under the conditions of temperature: 135°C, time: 0.9 sec, and pressure: 0.6 MPa, and secondary sealing was performed under the conditions of temperature: 130°C, time: 0.9 sec, and pressure: 0.6 MPa. Thereafter, cooling was performed under the conditions of temperature: room temperature, time: 1.5 seconds.

[0057] (Appearance evaluation) Appearance evaluation was performed on the samples of Examples 1 to 5 and Comparative Example 1. Appearance evaluation was performed using 10 samples for each of Examples 1 to 5 and Comparative Example 1. In the appearance evaluation, a case where a melted portion was observed on the laminate was evaluated as a sealing failure, and a case where a melted portion was not observed on the laminate was evaluated as a sealing success. The ratio of the number of samples evaluated as a sealing success was calculated as the sealing success rate. The results are shown in Table 1.

[0058] (Seal strength measurement and weldability evaluation) For the samples of Examples 1 to 5 and Comparative Example 1, the seal strength was measured and the weldability was evaluated.

[0059] In the seal strength measurement, first, a pair of laminates was cut into a strip shape of 15 mm width from each of the samples of Examples 1 to 5 and Comparative Example 1 so as to include the stopper to obtain a cut sample. Next, the pair of laminates of the cut sample was pulled in opposite directions using a Tensilon universal material testing machine (product name "Tensilon RTC-1250", manufactured by Orientec Co., Ltd.) to measure the seal strength of the pair of laminates against the welded part. The seal strength was defined as the strength when at least one of the pair of laminates peeled off from the welded part of the stopper, or the strength when at least one of the pair of laminates broke at the end of the welded part of the stopper without peeling off from the welded part of the stopper. The measurement results are shown in Table 1.

[0060] In the evaluation of weldability, when at least one of the pair of laminates peeled off from the welded part of the plug in the seal strength measurement, the weld was evaluated as poor, and when neither of the pair of laminates peeled off from the welded part of the plug and at least one of the pair of laminates broke at the end of the welded part of the plug, the weld was evaluated as good. The evaluation results are shown in Table 1.

[0061] (Consideration) As shown in Table 1, in the weldability evaluation, all of Examples 1 to 5 and Comparative Example 1 were rated as good welds. However, in the appearance evaluation, the slope S was 2.30 N / mm 3 In Comparative Example 1, the sealing success rate was low at 60%, while the slope S was 2.30 N / mm 3In the above-mentioned Examples 1 to 5, the sealing success rate was high at 90% or more. 3 It is presumed that if the above conditions are met, defects in the appearance of the laminate can be suppressed. [Explanation of symbols]

[0062] 1...pouch with spout, 2...pouch body, 3...spout, 4...body film, 4A...first body film, 4B...second body film, 5...folded film, 6...containment area, 7...base material layer, 8...sealant layer, 10...spout, 11...flow path, 12...pouring portion, 12a...screw portion, 13...welded portion, 14...flange portion, 16...side wall portion, 16A...first side wall portion, 16B...second side wall portion, 18...groove, 19...rib, 31...flow path, 32...pouring portion, 33...welded portion, 34...flange portion, 50...support base, 51...support surface, 52...indenter, 53...pressing surface, D1...first direction, D2...second direction, D3...third direction.

Claims

1. A high density polyethylene stopper for use in a pouch, A flow path extending in a first direction; A pouring portion extending in the first direction and forming a part of the flow path; a welded portion extending in the first direction and forming another part of the flow path, the welded portion has a shape in which a thickness in a third direction perpendicular to the first direction and the second direction becomes thinner from a central portion in a second direction perpendicular to the first direction toward an end portion in the second direction, When the indenter is pressed 4.5 mm into the welded portion in the third direction, the slope of the value obtained by dividing the load of the indenter by the contact area between the welded portion and the indenter with respect to the amount of pressing of the indenter in a predetermined region exceeding the yield point of the welded portion is 2.30 N / mm ３ That's all. Mouth plug.

2. The melting point, which is the temperature at the apex of the endothermic peak in the DSC curve obtained by differential scanning calorimetry, is 130.0° C. or lower. The plug according to claim 1.

3. A pouch body having a pair of films; The plug according to claim 1 or 2 is disposed between a pair of films and welded to the pair of films, Each of the pair of films has a sealant layer containing polyethylene on its innermost surface. Pouch with stopper.

4. The seal strength between the welded portion of the plug and the sealant layer is 25 N or more.

4. The spouted pouch according to claim 3.

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