JP2016117509A - Delamination container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delamination container in which an inner bag shrinks smoothly.SOLUTION: The delamination container comprises an outer shell and an inner bag, in which the inner bag is peeled from the outer shell and shrinks, according to reduction of a volume of a content. An inner layer forming the inner bag comprises an innermost layer contacting the content, and a coating layer which can slide to the innermost layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a delamination container.

  A laminated peeling container is known that suppresses air from entering the container by peeling and shrinking the inner layer from the outer layer as the contents are reduced (for example, Patent Document 1). Such a delamination container includes an inner bag constituted by an inner layer and an outer shell constituted by an outer layer.

Japanese Patent No. 3650175

  By the way, the contents in the container are discharged from a cap provided at the mouth of the container by compressing the outer shell. Since the cap is provided with a check valve, even if the content of the inner bag decreases as the contents are discharged, the inner bag is contracted because the outside air is not introduced into the inner bag. On the other hand, an outside air introduction hole for introducing outside air is provided in the space between the outer shell and the inner bag so that the outer shell is restored to its original shape in a state where no compressive force is applied to the outer shell. However, when the container size is small, the inner bag may not contract smoothly.

  This invention is made | formed in view of such a situation, and provides the lamination peeling container in which an inner bag shrink | contracts smoothly.

  According to the present invention, there is provided a laminated peeling container comprising a container body having an outer shell and an inner bag, and the inner bag peeling and shrinking from the outer shell as the content decreases. An inner layer to be formed is provided with a delamination container including an innermost layer in contact with the contents and a coating layer slidable with respect to the innermost layer.

  In the delamination container of the present invention, the inner layer includes an innermost layer that comes into contact with the contents, and a coating layer that can slide with respect to the innermost layer. Conventionally, a configuration in which a coating layer made of an EVOH resin having a high oxygen barrier property is bonded to the innermost layer and integrated is generally adopted, but the EVOH resin has high rigidity. Accordingly, the inner layer in which the covering layer and the innermost layer are integrated is not easily deformed, and the inner bag may not shrink smoothly. On the other hand, in the present invention, the innermost layer is not bonded to the coating layer, and the innermost layer can slide with respect to the coating layer. For this reason, even if the rigidity of the covering layer is high, the innermost layer can be deformed relatively freely, so that the inner bag contracts smoothly.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the coating layer is made of EVOH resin.

It is a perspective view which shows the structure of the container main body 3 of the lamination peeling container 1 of one Embodiment of this invention. It is sectional drawing which shows the state which attached the valve member 4 to the container main body 3 of FIG. 1, and performed the bending process with respect to the seal part 27a, and formed the bottom seal part 27. FIG. (A)-(c) is sectional drawing corresponding to FIG. 2 which shows the process of attaching the cap 23 to the opening | mouth part 9 of the container main body 3 of FIGS. 1-2. (A)-(c) is sectional drawing corresponding to FIG.3 (a)-(c) which shows another structure of the opening | mouth part 9 and the cap 23. FIG. (A)-(c) is sectional drawing corresponding to FIG. 3 (a)-(c) which shows another structure of the opening part 9 and the cap 23. FIG. (A) is a front view of the cylinder 5, (b) is a bottom view of the cylinder 5, (c) is an AA sectional view, (d) is a BB sectional view, and (e) is a valve member 4. Sectional view, (f) is a sectional view showing a state in which the valve member 4 is mounted on the outer shell 12, and (g) is a sectional view showing a state in which the moving body 6 abuts against the stopper portion 5h and closes the cavity portion 5g. It is. (A)-(b) is sectional drawing which shows the example which used the sealing member 8 as a coating | coated member. 3 is a cross-sectional view showing a configuration of an inner layer 13. FIG.

  Hereinafter, embodiments of the present invention will be described. Various characteristic items shown in the following embodiments can be combined with each other. The invention is established independently for each feature.

  As shown in FIGS. 1 to 2, a delamination container 1 according to an embodiment of the present invention includes a container body 3 and a valve member 4. The container body 3 includes a storage portion 7 that stores the contents, and a mouth portion 9 that discharges the contents from the storage portion 7.

  As shown in FIG. 2, the container body 3 includes an outer layer 11 and an inner layer 13 in the accommodating portion 7 and the mouth portion 9, an outer shell 12 is constituted by the outer layer 11, and an inner bag 14 is constituted by the inner layer 13. The As the content decreases, the inner layer 13 peels from the outer layer 11, whereby the inner bag 14 peels from the outer shell 12 and contracts.

  The mouth portion 9 is provided with an engaging portion 9d. In the present embodiment, it is assumed that a stopper-type cap 23 as shown in FIG. 3 is attached to the mouth portion 9, and the engaging portion 9 d is engaged with the engaging portion 23 c of the cap 23. A ring-shaped protrusion to be joined. However, in another embodiment, a cap or a pump having a female screw may be attached to the mouth portion 9, and in this case, the engaging portion 9 d is constituted by a male screw portion.

  Further, the mouth portion 9 is provided with a constricted portion 9c constricted toward the inside of the mouth portion 9 on the side of the accommodating portion 7 with respect to the engaging portion 9d. The upper wall 9e of the constricted portion 9c extends in a direction substantially perpendicular to the central axis C of the mouth portion 9, and stands at an angle of 45 to 135 degrees with respect to the upper wall 9e from the outer end of the upper wall 9e. A wall 9f is provided. The angle of the standing wall 9f with respect to the upper wall 9e is preferably 60 degrees to 120 degrees, and more preferably 75 to 105 degrees. In the present embodiment, the standing wall 9f extends substantially perpendicular to the upper wall 9e. A gap is provided between the inner layer 13e on the upper wall 9e and the inner layer 13f on the standing wall 9f, and the inner layer 13e and the inner layer 13f are not integrated. In other words, the inner layer 13 is not sandwiched between the outer layer 11e on the upper wall 9e and the outer layer 11f on the standing wall 9f.

  Further, an opposing wall 9g extending from the upper end of the standing wall 9f toward the inside of the mouth portion 9 (in the direction of the central axis C) is provided. Although the angle of the opposing wall 9g with respect to the upper wall 9e is not specifically limited, For example, it is -10-80 degree | times and is about 30 degree | times in this embodiment. A gap is provided between the inner layer 13e on the upper wall 9e and the inner layer 13g on the opposing wall 9g, and the inner layer 13e and the inner layer 13g are not integrated. In other words, the inner layer 13 is not sandwiched between the outer layer 11e on the upper wall 9e and the outer layer 11g on the opposing wall 9g.

  As described above, in this embodiment, since the inner layer 13 is not constrained by the outer layer 11 in the mouth portion 9, the inner layer 13 is smoothly peeled from the outer layer 11.

  Next, a method for attaching the cap 23 to the mouth portion 9 will be described with reference to FIG. The cap 23 to be mounted includes a main body portion 23a, a discharge port 23b provided in the main body portion 23a, an engagement portion 23c provided at a substantially distal end of an outer peripheral portion 23f that extends in a cylindrical shape from the main body portion 23a, and an outer peripheral portion 23f. An inner ring 23d that extends in a cylindrical shape from the main body 23a, a flow passage 23g that is provided inside the inner ring 23d and communicates with the discharge port 23b, and a check valve 23e that is provided in the flow passage 23g. In a state where the cap 23 is attached to the mouth portion 9, the contents in the storage portion 7 are discharged from the discharge port 23b through the flow passage 23g. On the other hand, since the check valve 23e blocks the inflow of the outside air from the discharge port 23b, the outside air does not enter the inner bag 14 of the container body 3, and the deterioration of the contents is suppressed. In addition, the structure of the cap 23 shown here is an example, For example, you may employ | adopt the cap 23 which has a check valve of another structure.

  When the cap 23 is mounted, first, as shown in FIG. 3A, the upper wall of the constricted portion 9c is used to suppress deformation of the housing portion 7 due to an impact when the cap 23 is mounted. The support 10 is brought into contact with the lower surface of 9e, and in this state, the engaging portion 23c of the cap 23 is engaged with the engaging portion 9d of the mouth portion 9 as shown in FIGS. . When the engaging portion 23c gets over the engaging portion 9d from the state of FIG. 3B, the outer peripheral portion 23f of the cap 23 is bent so as to increase in diameter and the mouth portion 9 is bent so as to reduce in diameter. When the mouth portion 9 is more easily bent, it is easier to attach the cap 23. However, the mouth portion 9 of the present embodiment is not provided with a support ring as disclosed in JP-A-11-292112. First, since the support portion 10 is brought into contact with the lower surface of the upper wall 9e of the constricted portion 9c to support the mouth portion 9, the mouth portion 9 is easily bent and the cap 23 can be easily attached. Moreover, since the opening | mouth part 9 is easy to bend, the inner bag 14 is easy to bend to the container exit vicinity, and it is easy to use up the content to the last.

  Further, the mouth portion 9a is provided with a contact portion 9a with which the outer surface of the inner ring 23d comes into contact, and the outer surface of the inner ring 23d comes into contact with the contact portion 9a of the mouth portion 9 to leak out the contents. Is prevented. In the present embodiment, the enlarged diameter portion 9b is provided at the tip of the mouth portion 9, and the inner diameter at the enlarged diameter portion 9b is larger than the inner diameter at the contact portion 9a. The outer surface is not in contact with the enlarged diameter portion 9b. If there is no enlarged diameter portion 9 b in the mouth portion 9, there is a problem that the inner ring 23 d enters between the outer layer 11 and the inner layer 13 when the inner diameter of the mouth portion 9 is slightly reduced due to variations in manufacturing. In some cases, however, when the mouth portion 9 has the enlarged diameter portion 9b, such a problem does not occur even if the inside diameter of the mouth portion 9 varies slightly.

  Even when the enlarged diameter portion 9 b is provided in the mouth portion 9, the inner layer 13 may be separated from the outer layer 11 due to friction between the inner ring 23 d and the contact portion 9 a. However, in the present embodiment, the constricted portion 9c is provided at a position closer to the accommodating portion 7 than the abutting portion 9a, and the constricted portion 9c suppresses the displacement of the inner layer 13, so that the inner bag 14 is the outer shell 12. It is suppressed that it falls out. As described above, the constricted portion 9 c has a function of suppressing slippage of the inner layer 13 and also has a function as a support portion of the mouth portion 9 by the support tool 10 when the cap 23 is attached.

Here, the another structural example of the opening | mouth part 9 and the cap 23 is shown using FIGS.
The configuration of FIG. 4 is different from the configuration of FIG. 3 in that the position of the contact portion 9a is different. In the configuration of FIG. 3, the contact portion 9a is closer to the container outlet than the engaging portion 9d, whereas in the configuration of FIG. 4, the contact portion 9a is closer to the container outlet than the engaging portion 9d. It is separated and is provided between the engaging portion 9d and the constricted portion 9c. Any configuration can be implemented, but in the case of the configuration of FIG. 3, in addition to being able to effectively use the volume in the container body 3, the inner layer 11 can be peeled to a position close to the container outlet. This is advantageous in that the object can be easily discharged to the end.

  The configuration of FIG. 5 is such that the opposing wall 9g is substantially parallel to the upper wall 9e, and the upper wall 9e, the standing wall 9f, and the opposing wall 9g are substantially U-shaped (laterally U-shaped). 3 is the main difference from the configuration of FIG. In such a configuration, a gap is provided between the inner layers 13e, 13f, and 13g, and these are not integrated, so the same effect as the configuration of FIG. 3 can be obtained. In the case of the configuration of FIG. 5, if the distance between the upper wall 9e and the opposing wall 9g is short, the inner layer 13e and the inner layer 13g are likely to come into contact and be integrated, so the lower surface of the upper wall 9e and the upper surface of the opposing wall 9g Is preferably 2.5 times or more the thickness of the upper wall 9e (the total thickness of the outer layer 11e and the inner layer 13e). In this case, a gap having a thickness approximately half the thickness of the upper wall 9e is formed between the inner layer 13e and the inner layer 13g.

  1-2, the accommodating part 7 is substantially cylindrical shape, and has the cylindrical cylindrical part 7b and the panel part 7c formed by denting a part of cylindrical part 7b. Since the container body 3 is formed by blow-molding a cylindrical (eg, cylindrical) laminated parison, the thickness of each part of the container body 3 increases as the blow ratio increases (distance from the central axis C). The larger the part, the smaller). Since the panel part 7c is closer to the central axis C than the cylindrical part 7b, the thickness is larger than that of the cylindrical part 7b. For this reason, the rigidity of the panel part 7c is higher than the cylindrical part 7b, the panel part 7c becomes a high rigidity part, and the cylindrical part 7b becomes a low rigidity part.

  The contents in the accommodating portion 7 are discharged by compressing and deforming the accommodating portion 7, but if the accommodating portion 7 is compressed by pinching the tubular portion 7b and the panel portion 7c, the less rigid cylindrical portion 7b is formed. Since deformation occurs preferentially, the deformation amount of the cylindrical portion 7b is larger than that of the panel portion 7c. And since the inner layer 13 is easy to peel from the outer layer 11 in a site | part with a large deformation amount, peeling of the inner layer 13 tends to advance preferentially in the cylindrical part 7b. In the present embodiment, the outer shell 12 is provided with an outside air introduction hole 15 that communicates the intermediate space 21 between the outer shell 12 and the inner bag 14 and the outer space S of the container body 3 in the housing portion 7. Since the outside air introduction hole 15 is provided on the cylindrical portion (low rigidity portion) 7b side, outside air is smoothly introduced into the intermediate space 21 between the outer shell 12 and the inner bag 14 when the inner layer 13 is peeled off. The inner layer 13 peels smoothly from the outer layer 11. For this reason, when the accommodating part 7 is compressed, the inner bag 14 is contracted smoothly, and when the compressive force is removed, the outer shell 12 is smoothly restored to the original shape.

  The outside air introduction hole 15 can be provided at any position of the cylindrical portion (low-rigidity portion) 7b, but is preferably provided at a position facing the panel portion 7c. This is because when the cylindrical portion 7b and the panel portion 7c are pinched and the accommodating portion 7 is compressed, the cylindrical portion 7b is most deformed at a position facing the panel portion 7c.

  Further, in the present embodiment, the outside air introduction hole 15 is provided with a valve member 4 that adjusts the flow of air between the intermediate space 21 and the external space S. The valve member 4 is mounted in a valve member mounting recess 7 a provided in the housing portion 7. When the accommodating portion 7 is compressed, the valve member 4 is closed to block the flow of air from the intermediate space 21 to the external space S, thereby increasing the pressure in the intermediate space 21, and the pressure applied to the outer shell 12 is increased. It has a function to facilitate transmission to the inner bag 14. For this reason, even when the contents in the inner bag 14 are reduced, the contents can be easily discharged. On the other hand, the valve member 4 has a function of opening and allowing the air from the external space S to the intermediate space 21 to pass when the compressive force applied to the accommodating portion 7 is removed. For this reason, outside air is introduced into the intermediate space 21, and the outer shell 12 returns to its original shape smoothly. Since the inner bag 14 can be directly compressed through the outer shell 12 by largely deforming the outer shell 12 without the valve member 4, the valve member 4 is not an essential configuration.

  As described above, the valve member 4 only needs to have a function capable of opening and closing the outside air introduction hole 15. As an example of the configuration, the valve member 4 itself is provided with a through-hole and a valve that can be opened and closed. The open air opening 15 is opened and closed by opening and closing the through-hole by the action of the valve, and the gap between the edge of the external air introducing hole 15 and the valve member 4 is opened and closed by the movement of the valve member 4. By doing so, what is comprised so that the valve member 4 may open and close the external air introduction hole 15 is mentioned. The former valve member 4 is suitably applied to a small container such as an eye drop container, because the valve member 4 functions without any problem even when the size of the outside air introduction hole 15 varies somewhat.

  Here, an example of the valve member 4 will be described with reference to FIGS. 2 and 7. The valve member 4 includes a cylindrical body 5 having a hollow portion 5g provided so as to communicate the outer space S and the intermediate space 21, and a movable body 6 movably accommodated in the hollow portion 5g. The cylindrical body 5 and the movable body 6 are formed by injection molding or the like, and the movable body 6 is disposed in the hollow portion 5g by pushing the movable body 6 into the hollow portion 5g so as to get over a stopper portion 5h described later. be able to. In the present embodiment, the hollow portion 5g has a substantially cylindrical shape, and the moving body 6 has a substantially spherical shape, but may have another shape as long as the same function as that of the present embodiment can be realized. . The diameter of the hollow portion 5g in the cross section (the cross section in FIG. 6D) is slightly larger than the diameter in the corresponding cross section of the moving body 6, and the moving body 6 is shown by the arrow in FIG. The shape is freely movable in the B direction. The ratio value defined by the diameter of the cross section of the cavity 5g / the diameter of the corresponding cross section of the moving body 6 is preferably 1.01 to 1.2, and more preferably 1.05 to 1.15. If this value is too small, smooth movement of the moving body 6 is hindered. If this value is too large, the gap between the surface 5j surrounding the cavity 5g and the moving body 6 becomes too large, and the container body 3 is compressed. This is because the force applied to the moving body 6 tends to be insufficient.

  The cylindrical body 5 includes a shaft portion 5 a disposed in the outside air introduction hole 15, a locking portion 5 b provided on the outer space S side of the shaft portion 5 a and preventing the cylindrical body 5 from entering the intermediate space 21, It has an enlarged diameter portion 5c that is provided on the intermediate space 21 side of the portion 5a and prevents the cylindrical body 5 from being pulled out from the outside of the container body 3. The shaft portion 5a is tapered toward the intermediate space 21 side. That is, the outer peripheral surface of the shaft portion 5a is a tapered surface. The cylindrical body 5 is attached to the container body 3 when the outer peripheral surface of the shaft portion 5 a is in close contact with the edge of the outside air introduction hole 15. With such a configuration, the gap between the edge of the outside air introduction hole 15 and the cylindrical body 5 can be reduced. As a result, when the container main body 3 is compressed, the air in the intermediate space 21 becomes free from the outside air introduction hole 15. Outflow from the gap between the edge and the cylinder 5 can be suppressed. In addition, since the cylindrical body 5 is attached to the container main body 3 when the outer peripheral surface of the shaft portion 5a is in close contact with the edge of the outside air introduction hole 15, the expanded diameter portion 5c is not necessarily essential.

  The surface 5j surrounding the cavity 5g is provided with a stopper portion 5h for locking the moving body 6 when the moving body 6 moves from the intermediate space 21 side toward the external space S side. The stopper portion 5h is configured by an annular protrusion, and when the moving body 6 comes into contact with the stopper portion 5h, the air flow through the hollow portion 5g is blocked.

  Moreover, the front-end | tip of the cylinder 5 is the flat surface 5d, and the opening part 5e connected to the cavity part 5g is provided in the flat surface 5d. The opening 5e has a substantially circular central opening 5e1 provided at the center of the flat surface 5d, and a plurality of slits 5e2 radiating from the central opening 5e1. According to such a configuration, the flow of air is not hindered even when the moving body 6 is in contact with the bottom of the cavity 5g.

  As shown in FIG. 6 (f), the valve member 4 is inserted into the outside air introduction hole 15 from the expanded diameter portion 5 c side and pushed into a position where the locking portion 5 b contacts the outer surface of the outer shell 12. The outer peripheral surface of the portion 5 a is held by the outer shell 12 in a state where the outer peripheral surface is in close contact with the edge of the outside air introduction hole 15. When the outer shell 12 is compressed in a state where air is contained in the intermediate space 21, the air in the intermediate space 21 enters the hollow portion 5g through the opening 5e, and pushes up the moving body 6 to contact the stopper portion 5h. When the moving body 6 comes into contact with the stopper portion 5h, the air flow through the hollow portion 5g is blocked.

  When the outer shell 12 is further compressed in this state, the pressure in the intermediate space 21 is increased. As a result, the inner bag 14 is compressed and the contents in the inner bag 14 are discharged. Further, when the compressive force applied to the outer shell 12 is released, the outer shell 12 tries to recover by its own elasticity. By reducing the pressure in the intermediate space 21 as the outer shell 12 is restored, a force FI in the container inner direction is applied to the moving body 6 as shown in FIG. As a result, the moving body 6 moves toward the bottom of the hollow portion 5g and enters the state shown in FIG. 6 (f), and the outside air enters the intermediate space 21 through the gap between the moving body 6 and the surface 5j and the opening 5e. Is introduced.

  The valve member 4 can be attached to the container main body 3 by inserting the expanded diameter portion 5 c into the intermediate space 21 while the expanded diameter portion 5 c expands the outside air introduction hole 15. Therefore, it is preferable that the tip of the expanded diameter portion 5c has a tapered shape. Such a valve member 4 is excellent in productivity because it can be mounted simply by pushing the expanded diameter portion 5c into the intermediate space 21 from the outside of the container body 3. Since the flat surface 5 d is provided at the tip of the cylinder 5, the inner bag 14 does not move even if the tip of the valve member 4 collides with the inner bag 14 when the valve member 4 is pushed into the intermediate space 21. It is hard to get hurt.

  A covering member that covers the periphery of the valve member 4 and the outside air introduction hole 15 and prevents the introduction of outside air into the intermediate space 21 in a state where the valve member 4 is mounted may be provided. According to such a configuration, odorous gas in the factory can be prevented from entering the intermediate space 21 in the manufacturing process. For example, the covering member can be attached in a clean atmosphere after filling the contents into the inner bag 14. In addition, according to such a configuration, when the container is sterilized with high-temperature steam, it is possible to prevent steam from entering the intermediate space 21 from the outside air introduction hole 15 and moisture remaining in the intermediate space 21. . In the state where the valve member 4 and the outside air introduction hole 15 are covered with the covering member, the outside air is not introduced into the intermediate space 21 and is not restored to the original shape after the outer shell 12 is compressed. Therefore, the user removes the covering member. It is assumed to be used in a state.

  As a specific configuration example, as shown in FIGS. 7A to 7B, an example in which a seal member 8 to be adhered around the valve member 4 and the outside air introduction hole 15 is provided. In the example of FIG. 7A, the seal member 8 is attached on the annular convex portion 7d provided so as to surround the valve member mounting concave portion 7a. In the example of FIG. 7B, the seal member 8 is affixed on the annular convex portion 7d provided so as to surround the valve member 4 and the outside air introduction hole 15 in the valve member mounting concave portion 7a. In the example of FIG. 7B, the seal member 8 can be prevented from protruding from the surface of the outer shell 12.

  As shown in FIGS. 1 and 2, the bottom surface 29 of the accommodating portion 7 is provided with a central concave region 29a and a peripheral region 29b provided around the central concave region 29a. A bottom seal portion 27 protruding from the bottom surface 29 is provided. The method for forming the bottom seal portion 27 is as follows.

  First, as shown in FIG. 1 (b), the sealing portion 27a of the laminated parison when blow-molding a cylindrical laminated parison having the outer layer 11 and the inner layer 13 is defined in a central concave region 29a by a peripheral region 29b. It forms so that it may become a thin film shape so that it may protrude beyond the surface P (illustrated in FIG. 2) to be performed (seal portion forming step). The seal portion 27a can be formed by sandwiching and compressing the laminated parison 27a with a split mold during blow molding. The seal portion 27a is preferably formed so that its maximum thickness is 1/3 or less (preferably 1/4 or 1/5 or less) of the thickness of the laminated parison. The thickness of the seal portion 27a is, for example, 0.1 to 0.4 mm, preferably 0.2 to 0.3 mm. In one example, a cylindrical laminated parison having a wall thickness of 1.5 mm is compressed to 0.25 mm in the seal portion 27a. The seal portion 27a is preferably formed so that its entire thickness is uniform.

  Next, as shown in FIG. 2, the bottom seal portion 27 is formed by bending the seal portion 27a so that the seal portion 27a is accommodated in the central concave region 29a. Since the seal portion 27a has an extremely thin thin film shape, it can be easily folded and stored in the central concave region 29a. Moreover, you may give a fusion | melting process with respect to the seal part 27a instead of a bending process. Since the seal portion 27a has an extremely thin thin film shape, it is easily melted and stored in the central concave region 29a.

  By forming the bottom seal portion 27 by bending or melting the seal portion 27a, the impact resistance at the bottom surface 29 of the container body 3 can be improved. Further, since the bottom seal portion 27 does not protrude from the surface P, the bottom seal portion 27 protrudes from the surface P when the delamination container 1 is set up, and the self-supporting property of the delamination container 1 is hindered. Is prevented.

  Moreover, as shown in FIG.1 (b), the recessed area | region of the bottom face 29 is provided so that the bottom face 29 whole may be crossed in the longitudinal direction of the seal | sticker part 27a. That is, the central concave region 29a and the peripheral concave region 29c are connected. With such a configuration, the seal portion 27a can be easily bent.

  Next, the layer configuration of the container body 3 will be described in more detail. The container body 3 includes an outer layer 11 and an inner layer 13. The outer layer 11 is formed to be thicker than the inner layer 13 so that the restoring property is high.

  The outer layer 11 is composed of, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, an ethylene-propylene copolymer, and a mixture thereof. In addition, when the diameter of the container is 30 mm or less, it is preferable that the outer layer 11 includes a low density polyethylene. According to this configuration, squeeze for discharging the content liquid is facilitated. For example, the outer layer 11 can be composed of a single layer of low density polyethylene. Moreover, the outer layer 11 can also be comprised by the multilayer of a low density polyethylene and the recycled material which uses the burr | flash at the time of shaping | molding.

  As shown in FIG. 8, in this embodiment, the inner layer 13 includes an innermost layer 13a that comes into contact with the contents, and a covering layer 13b that can slide with respect to the innermost layer 13a. Generally, a configuration is adopted in which a coating layer 13b made of EVOH resin having a high oxygen barrier property is bonded to and integrated with the innermost layer 13a. However, since EVOH resin has high rigidity, only that much In some cases, the inner layer 13 in which the covering layer 13b and the innermost layer 13a are integrated is not easily deformed, and the inner bag 14 does not contract smoothly. On the other hand, in the present embodiment, the innermost layer 13a is not bonded to the covering layer 13b, and the innermost layer 13a is slidable with respect to the covering layer 13b. For this reason, even if the rigidity of the covering layer 13b is high, the innermost layer 13a can be deformed relatively freely, so that the inner bag 14 contracts smoothly. Further, since the innermost layer 13a and the covering layer 13b are separated, even when the outer layer 13b is damaged by mistake when forming the outside air introduction hole 15, there is a problem if the innermost layer 13a is not damaged. Does not occur.

  When the innermost layer 13a and the coating layer 13b are not bonded, the outside air introduction hole 15 may be formed so as to penetrate the outer layer 11 and the coating layer 13b. In this case, outside air is introduced into the space between the innermost layer 13a and the covering layer 13b.

  The innermost layer 13a is a layer in contact with the contents of the delamination container 1, for example, a polyolefin such as a low density polyethylene, a linear low density polyethylene, a high density polyethylene, a polypropylene, an ethylene-propylene copolymer and a mixture thereof. And EVOH resin. 50-300 MPa is preferable and, as for the tensile elasticity modulus of resin which comprises the innermost layer 13a, 70-200 MPa is preferable. This is because the innermost layer 13a is particularly flexible when the tensile elastic modulus is in such a range. Specifically, the tensile elastic modulus is, for example, 50, 100, 150, 200, 250, or 300 MPa, and may be in a range between any two of the numerical values exemplified here. When the content is a chemical solution, the innermost layer 13a is preferably made of polypropylene or EVOH resin in order to make it difficult for the chemical component to be adsorbed to the innermost layer 13a. In this case, it is particularly preferable to use polypropylene as the innermost layer 13a because the inner layer can be made more flexible by causing the inner layer to contract smoothly and prevent occurrence of pinholes and the like. From the viewpoint of flexibility, a propylene random copolymer is particularly preferable as the innermost layer 13a. The propylene random copolymer is a random copolymer between propylene and another monomer, and the content of monomers other than propylene is smaller than 50 mol%, and preferably 5 to 35 mol%. Specifically, this content is, for example, 5, 10, 15, 20, 25, 30 mol%, and may be within a range between any two of the numerical values exemplified here. As the monomer copolymerized with propylene, ethylene is particularly preferred. In the case of a random copolymer of propylene and ethylene, the ethylene content is preferably 5 to 30 mol%, specifically, for example, 5, 10, 15, 20, 25, 30 mol%, and the numerical values exemplified here It may be within the range between any two.

  The coating layer 13b is a layer provided for the purpose of imparting oxygen barrier properties and the like, and is preferably made of EVOH resin. When the coating layer 13b is made of EVOH resin, the peelability between the outer layer 11 and the inner layer 13 is improved.

  EVOH resin is an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of ethylene and vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, and preferably 32 mol% or less from the viewpoint of oxygen barrier properties. Although the minimum of ethylene content is not prescribed | regulated in particular, since the softness | flexibility of EVOH resin tends to fall, so that ethylene content is small, 25 mol% or more is preferable. The EVOH resin preferably contains an oxygen absorbent. By containing the oxygen absorbent in the EVOH resin, the oxygen barrier property of the EVOH resin can be further improved.

  The melting point of the EVOH resin is preferably higher than the melting point of the resin constituting the outer layer 11. When the outside air introduction hole 15 is formed in the outer layer 11 using a heating type punching device, the outside air introduction hole 15 is formed in the outer layer 11 by making the melting point of the EVOH resin higher than the melting point of the resin constituting the outer layer 11. In doing so, the holes can be prevented from reaching the inner layer 13. From this viewpoint, the difference between (the melting point of EVOH) − (the melting point of the resin constituting the outer layer 11) is preferably large, preferably 15 ° C. or higher, and particularly preferably 30 ° C. or higher. The difference in melting point is, for example, 5 to 50 ° C., specifically, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 ° C., and any of the numerical values exemplified here. Or within a range between the two.

  When the structure of the inner layer is not limited in the claims, the structure of the inner layer 13 is not limited. In that case, an adhesive layer may be provided between the innermost layer 13a and the covering layer 13b. The adhesive layer is a layer having a function of adhering the covering layer 13b and the innermost layer 13a. For example, an acid-modified polyolefin having a carboxyl group introduced into the above-described polyolefin (eg, maleic anhydride-modified polyethylene), Ethylene vinyl acetate copolymer (EVA). An example of the adhesive layer 13 is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

1: Laminated peeling container, 3: Container body, 4: Valve member, 5: Cylindrical body, 6: Moving body, 7: Storage part, 9: Mouth part, 11: Outer layer, 12: Outer shell, 13: Inner layer, 14 : Inner bag, 15: Outside air introduction hole, 21: Intermediate space, 23: Cap, 27: Bottom seal part

Claims (2)

A laminated peeling container comprising a container body having an outer shell and an inner bag and the inner bag peeling and shrinking from the outer shell as the content decreases,
The inner layer constituting the inner bag is a delamination container including an innermost layer in contact with the contents and a coating layer slidable with respect to the innermost layer. The laminated peeling container according to claim 1, wherein the coating layer is made of EVOH resin.