JP2017193342A - Delamination container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delamination container having an outer shell which achieves excellent restorability.SOLUTION: According to the invention, a delamination container includes a container body having an outer shell and an inner bag and in which the inner bag shrinks in conjunction with decrease of a content. The container body includes: a storage part for storing the content; and a mouth part which discharges the content from the storage part. The storage part includes: a front surface side pressing surface and a rear surface side pressing surface which are pressed when the container body is compressed and face each other; and a pair of connection surfaces which connects the front surface side pressing surface with the rear surface side pressing surface. Each connection surface is configured so that the inner bag deforms so as to be recessed to the inner side of the container body in conjunction with a decrease of the content.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a delamination container in which an inner bag shrinks with a decrease in contents.

  There is also known a delamination container that includes an outer shell and an inner bag and that shrinks as the contents are reduced (for example, Patent Document 1). In such a container, it is assumed that the contents are discharged by compressing the outer shell, and the outer shell is restored to the original shape after the contents are discharged.

Japanese Patent No. 4055185

  However, when the present inventor has evaluated the discharge performance of the container of Patent Document 1, when the amount of the remaining content is small, the outer shell is restored when the outer shell is largely deformed to discharge the content. It was found that it may be difficult to restore the shape of

  This invention is made | formed in view of such a situation, and provides the delamination container excellent in the recoverability of the outer shell.

  According to the present invention, there is provided a delamination container including a container body that has an outer shell and an inner bag, and the inner bag shrinks as the contents are reduced, and the container body contains the contents. And a front-side pressing surface and a rear-side pressing surface that are opposed to each other when the container body is compressed, and A pair of connecting surfaces that connect the front-side pressing surface and the back-side pressing surface are provided, and the connecting surface is deformed so that the inner bag is recessed toward the inside of the container body as the contents decrease. A delamination container configured as described above is provided.

  In the delamination container of the present invention, the inner bag is configured to be deformed so as to be recessed toward the inner side of the container body as the contents are reduced on the connection surface. For this reason, the bellows structure is formed in the inner bag at the connecting surface when the amount of the contents is reduced. In this state, when the outer shell is compressed by pressing the front side pressing surface and the rear side pressing surface and the contents are discharged, the bellows structure of the inner bag acts as a spring, and the front side pressing surface and the rear side pressing surface Applying force to the outer shell in the direction of increasing the distance. This force makes it easier to restore the outer shell to its original shape. Further, since the inner bag is formed with the bellows structure, the inner bag is not stuck in the outer shell, so that the deterioration of the restoring property of the outer shell due to the inner bag being stuck in the outer shell can be suppressed.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the radius of curvature RC of the connecting surface is larger than a radius RI of a circle inscribed in the front side pressing surface and the back side pressing surface in a cross section perpendicular to the central axis of the container body.
Preferably, RC / RI ≧ 1.2.
Preferably, the connection surface is curved toward the inside of the container body in a cross section that is parallel to the central axis of the container body and passes through the connection surface.
Preferably, the radius of curvature RA of at least one of the front-side pressing surface and the back-side pressing surface is inwardly inscribed in the front-side pressing surface and the back-side pressing surface in a cross section perpendicular to the central axis of the container body. It is larger than the radius RI of the tangent circle.
Preferably, RA / RI ≧ 1.2.
Preferably, at least one of the front-side pressing surface and the back-side pressing surface is parallel to a central axis of the container main body, and in a cross section passing through the front-side pressing surface and the back-side pressing surface, the container Curved toward the inside of the body.
Preferably, the accommodating portion includes a ridge line portion provided so as to surround a central axis of the container body, and the front-side pressing surface and the back-side pressing surface are further away from the mouth than the ridge line portion. Provided in position.
Preferably, the accommodating portion includes a reduced diameter surface that decreases in diameter toward the mouth portion at a position closer to the mouth portion than the ridge line portion, and the reduced diameter surface is parallel to a central axis of the container body. And in a cross section passing through the connecting surface, it is curved toward the inside of the container body.
Preferably, the outer shell includes an outside air introduction hole communicating with the outer space of the container body on the reduced diameter surface.
Preferably, at least one of the front-side pressing surface and the back-side pressing surface includes a base surface and a panel surface formed by recessing the base surface, and is perpendicular to a central axis of the container body and In a cross section passing through the base surface, a distance between the front-side pressing surface and the back-side pressing surface is longer than a distance between the pair of connecting surfaces.
Preferably, in a cross section perpendicular to the central axis of the container body and passing through the panel surface, a distance between the front-side pressing surface and the back-side pressing surface is substantially equal to a distance between the pair of connecting surfaces. be equivalent to.
Preferably, the outer shell includes an outside air introduction hole communicating with an outer space of the container body on the base surface.
Preferably, the inner bag includes a layer formed of a resin containing a cycloolefin polymer.

It is a perspective view of the container main body 3 of the lamination peeling container 1 of 1st Embodiment of this invention. (A) is a front view of the container main body 3 of FIG. 1, (b) is a BB cross-sectional view in (a) in a state where the valve member 4 is mounted on the container main body 3, ( (c) is CC sectional drawing in (b). It is a six-view figure of the container main body 3 of FIG. 1, (a) is a front view, (b) is a top view, (c) is a bottom view, (d) is a left side view, (e) is a right side view, (F) is a rear view. It is sectional drawing corresponding to FIG.2 (b) which shows an example of the cap 23 with which the opening | mouth part 9 of the container main body 3 is mounted | worn. (A) is a perspective view of the valve member 4, (b) is sectional drawing for demonstrating the function of the valve member 4. FIG. (A) shows that the inner bag 14 is connected to the container main body 3 on the connection surface 16c as the content L decreases in the delamination container 1 with the cap 23 attached after the container main body 3 is filled with the content L. It is sectional drawing corresponding to Drawing 2 (a) showing the state where bellows structure J is formed by denting towards the inside, and (b) is a CC sectional view in (a). (A)-(b) is sectional drawing corresponding to FIG. 6 (a)-(b) which shows a state when the outer shell 12 is compressed from the state of FIG. It is a perspective view of the container main body 3 of the lamination peeling container 1 of 2nd Embodiment of this invention. (A) is a front view of the container main body 3 of FIG. 8, (b) is a BB cross-sectional view in (a) in a state where the valve member 4 is mounted on the container main body 3, ( (c) is CC sectional drawing in (b). FIG. 9 is a hexahedral view of the container body 3 of FIG. 8, (a) is a front view, (b) is a plan view, (c) is a bottom view, (d) is a left side view, (e) is a right side view, (F) is a rear view. (A) is a front view of the cylinder 5, (b) is a bottom view of the cylinder 5, (c) is an AA cross-sectional view in (b), and (d) is a BB cross-section in (c). (E) is a cross-sectional view of the valve member 4, (f) is a cross-sectional view showing a state in which the valve member 4 is mounted on the outer shell 12, and (g) is a hollow portion where the moving body 6 abuts against the stopper portion 5h. It is sectional drawing which shows the state which obstruct | occluded 5g. (A)-(b) is sectional drawing which shows the state corresponding to FIG.6 (b) and FIG.7 (b) in the lamination peeling container 1 of 2nd Embodiment of this invention.

  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.

1. 1st Embodiment As shown in FIGS. 1-2, the lamination peeling container 1 of 1st Embodiment of this invention is provided with the container main body 3 and the valve member 4. As shown in FIG. The container body 3 includes a storage portion 7 that stores the contents, and a mouth portion 9 that has an opening 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 contents decrease, the inner layer 13 moves away from the outer layer 11, whereby the inner bag 14 moves away from the outer shell 12 and contracts. In addition, before accommodating the content in the accommodating part 7, the preliminary | backup peeling process which peels the inner layer 13 from the outer layer 11 may be performed. In this case, after the preliminary peeling, the inner layer 13 is brought into contact with the outer layer 11 by blowing air into the accommodating portion 7 or accommodating the contents. And the inner layer 13 leaves | separates from the outer layer 11 with the content reduction. On the other hand, when the preliminary peeling step is not performed, the inner layer 13 is peeled from the outer layer 11 and separated from the outer layer 11 when the contents are discharged.

  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. The outer layer 11 may have a multi-layer configuration. For example, a configuration in which both sides of the repro layer are sandwiched between layers formed of a virgin material may be used. Here, the repro layer refers to a layer that is used by recycling burrs produced during the molding of the container. Moreover, the outer layer 11 is formed thicker than the inner layer 13 so that the restoring property becomes high. When the tensile modulus of the outer layer 11 is smaller than that of the inner layer 13 (preferably ½ or less, more preferably ¼ or less), the resilience of the outer shell 12 tends to deteriorate. In this case, the advantage of applying the present invention is particularly great.

  The inner layer 13 includes an EVOH layer provided on the container outer surface side, an inner surface layer provided on the container inner surface side of the EVOH layer, and an adhesive layer provided between the EVOH layer and the inner surface layer. By providing the EVOH layer, the gas barrier property and the peelability from the outer layer 11 can be improved. The adhesive layer may be omitted.

  The EVOH layer is a layer made of 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, since the softness | flexibility of an EVOH layer tends to fall, so that ethylene content is small, 25 mol% or more is preferable.

  An inner surface layer is a layer which contacts the contents of the lamination peeling container 1, for example, a low density polyethylene, a linear low density polyethylene, a high density polyethylene, a polypropylene, an ethylene-propylene copolymer, a cycloolefin polymer, and a mixture thereof. It is preferably made of polyolefin such as low density polyethylene or linear low density polyethylene. Among these, since the cycloolefin polymer has relatively high rigidity, when the inner layer 13 includes a layer formed of a resin containing a cycloolefin polymer, the inner bag 14 is in an outer bag with the inner bag 14 contracted. Since the phenomenon that the recovery of the outer shell 12 is hindered by being caught in the shell 12 tends to occur, the present invention is particularly effective in such a case.

  The adhesive layer is a layer having a function of adhering the EVOH layer and the inner surface layer. For example, an acid-modified polyolefin having a carboxyl group introduced into the above-described polyolefin (eg, maleic anhydride-modified polyethylene), ethylene acetate It is a vinyl copolymer (EVA). An example of the adhesive layer is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

  The mouth portion 9 is provided with an engaging portion 9d that can engage with the cap 23 illustrated in FIG. The cap 23 may be a stopper type or a screw type.

  In the present embodiment, the cap 23 is of a stopper type and includes a cap body 23a and a cap cover 23i as shown in FIG. The cap main body 23a and the cap cover 23i are connected at a connecting portion 23j, and the cap cover 23i can be opened and closed. The cap body 23a includes an upper part 23t, a discharge port 23b provided in the upper part 23t, a cylindrical part 23f extending in a cylindrical shape from the outer periphery of the upper part 23t, and an engaging part provided along the inner peripheral surface of the cylindrical part 23f. 23c, an inner ring 23d extending in a cylindrical shape from the upper part 23t inside the cylindrical portion 23f, a flow passage 23g provided inside the inner ring 23d and communicating with the discharge port 23b, and an inner ring provided in the flow passage 23g An annular valve seat 23r extending inward from 23d and a check valve 23e are provided. The check valve 23e has a valve body 23e1 that closes the discharge hole 23r1 formed at the center of the annular valve seat 23r, and a plurality of elastic members that extend from the inner ring 23d toward the center in the radial direction and elastically support the valve body 23e1. It has a piece 23e2. Then, the check valve 23e is opened by the valve body 23e1 being pushed up from the discharge hole 23r1 by the pressure increase in the accommodating portion 7.

  The engaging portion 23 c is an annular protrusion that can be engaged with the engaging portion 9 d of the mouth portion 9. 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, Comprising: You may employ | adopt the cap 23 which has a check valve of another structure.

  As shown in FIGS. 1-2, the accommodating part 7 is provided with the valve member attachment recessed part 7a, and the external air introduction hole 15 is provided in the recessed part 7a. The outside air introduction hole 15 is a through hole provided only in the outer shell 12, and 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. A valve member 4 that adjusts the flow of air between the intermediate space 21 and the external space S is attached to the outside air introduction hole 15. The recess 7a is provided in order to avoid interference between the valve member 4 and the shrink film when the accommodating portion 7 is covered with the shrink film. Further, an air circulation groove 7b extending from the recess 7a toward the mouth 9 is provided so that the recess 7a is not sealed with the shrink film.

  As shown in FIG. 5 (a), the valve member 4 is provided on the intermediate space 21 side of the shaft portion 8a disposed in the outside air introduction hole 15 and has a larger cross-sectional area than the shaft portion 8a. A lid portion 8c and a locking portion 8b provided on the outer space S side of the shaft portion 8a and preventing the valve member 4 from entering the intermediate space 21 are provided. The valve member 4 can be attached to the container main body 3 by inserting the lid portion 8c into the intermediate space 21 while the lid portion 8c widens the outside air introduction hole 15. Therefore, it is preferable that the tip of the lid portion 8c has a tapered shape. Since such a valve member 4 can be mounted simply by pushing the lid portion 8c into the intermediate space 21 from the outside of the container body 3, it is excellent in productivity.

  The lid portion 8c is configured to substantially close the outside air introduction hole 15 when the outer shell 12 is compressed, and has a shape in which the cross-sectional area decreases as the shaft portion 8a is approached. The locking portion 8b is configured such that air can be introduced into the intermediate space 21 when the outer shell 12 is restored after being compressed. When the outer shell 12 is compressed, the pressure in the intermediate space 21 becomes higher than the external pressure, and the air in the intermediate space 21 leaks out from the outside air introduction hole 15. The lid portion 8c moves toward the outside air introduction hole 15 by this pressure difference and the air flow, and the lid portion 8c closes the outside air introduction hole 15 as shown in FIG. Since the cross-sectional area becomes smaller as the lid portion 8c approaches the shaft portion 8a, the lid portion 8c easily fits into the outside air introduction hole 15 and closes the outside air introduction hole 15.

  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. At this time, the lid portion 8 c is separated from the outside air introduction hole 15, the outside air introduction hole 15 is released from being blocked, and outside air is introduced into the intermediate space 21. Further, a flow passage 8d is provided in the locking portion 8b so that the locking portion 8b does not block the outside air introduction hole 15, and even when the locking portion 8b is in contact with the outer shell 12, the flow is prevented. Outside air can be introduced into the intermediate space 21 through the path 8 d and the outside air introduction hole 15.

  As shown in FIGS. 1 and 2, a bottom seal protrusion 27 protruding from the bottom surface 29 is provided on the bottom surface 29 of the housing portion 7. As shown in FIG. 2B, by bending the bottom seal protrusion 27, the impact resistance of the container body 3 can be improved and the self-supporting property of the container body 3 can be improved.

  By the way, as shown in FIGS. 1-2, the accommodating part 7 is provided with the ridgeline part 7e so that the central axis C which passes along the center of the opening | mouth part 9 of the container main body 3 may be surrounded. A front side pressing surface 16f, a back side pressing surface 16b, and a pair of connecting surfaces 16c that connect these are provided below the ridge line portion 7e (the side farther from the mouth portion 9 than the ridge line portion 7e). Yes. On the upper side of the ridge line portion 7e (the side closer to the mouth portion 9 than the ridge line portion 7e), a reduced diameter surface 7f that decreases in diameter toward the mouth portion 9 is provided. The pressing surfaces 16f and 16b are surfaces that are supposed to be pressed when the contents are discharged. As shown in FIG. 2B, at least one of the pressing surfaces 16f and 16b (both in the present embodiment) is parallel to the central axis C of the container body 3 and passes through the pressing surfaces 16f and 16b (that is, In FIG. 2 (b), it is curved toward the inside of the container body 3 (that is, it is constricted). Further, as shown in FIGS. 1 and 2A, the connecting surface 16c is parallel to the central axis C of the container body 3 and in a cross section (a cross-sectional view is not shown) passing through the connecting surface 16c. Is curving towards the inside (ie, it is constricted). Further, the reduced diameter surface 7f is parallel to the central axis C of the container body 3 and is curved toward the inside of the container body 3 in a cross section passing through the connecting surface 16c. Thus, since at least one of the upper side and the lower side (both in the present embodiment) of the ridge line portion 7e is curved toward the inner side of the container body 3, as shown in FIG. 16b is easily bent with respect to the reduced diameter surface 7f. For this reason, when the pressing surfaces 16f and 16b are pressed and the outer shell 12 is compressed, the ridge line portion 7e is hardly deformed, and the restoring property of the outer shell 12 is enhanced. Further, the outside air introduction hole 15 is provided in the reduced diameter surface 7f, and the reduced diameter surface 7f is not easily deformed when the outer shell 12 is compressed, so that the introduction of the outside air may be hindered by the deformation of the outer shell 12. The outside air is smoothly introduced into the intermediate space 21. In addition, at least one of the pressing surfaces 16f and 16b and the connecting surface 16c (all in the present embodiment) has a constricted shape, so that the resilience of the outer shell 12 is enhanced.

  As shown in FIG. 2C, the curvature radius RC of the connecting surface 16c is larger than the radius RI of the circle IC inscribed in the pressing surfaces 16f and 16b in a cross section perpendicular to the central axis C of the container body 3. . The circle IC is the largest circle that can be formed in the container body 3 in the cross section. In this embodiment, since the connection surface 16c is a flat surface, the radius of curvature RC is infinite. In the second embodiment, the radius of curvature RC of the connecting surface 16c is 2.1 times the radius RI. RC / RI is preferably 1.2 times or more, more preferably 1.5 times or more, and further preferably 2 times or more. The upper limit is not particularly defined and may be infinite.

  Further, as shown in FIG. 2C, the radii of curvature RF and RB of at least one of the pressing surfaces 16f and 16b (both in the present embodiment) are larger than the radius RI. In the present embodiment, the curvature radii RF and RB are both about 1.8 times the radius RI. RF / RI and RB / RI are preferably 1.2 times or more, more preferably 1.5 times or more, and still more preferably 1.7 times or more. The upper limit is not particularly defined and may be infinite.

  Further, as shown in FIG. 2C, the radii of curvature RFC and RBC at the boundaries 16fc and 16bc between at least one of the pressing surfaces 16f and 16b (both in the present embodiment) and the connecting surface 16c are smaller than the radius RI. It has become. In this embodiment, the curvature radii RFC and RBC are both about 0.86 times the radius RI. RFC / RI and RBC / RI are preferably 0.95 times or less, and more preferably 0.9 times or less. The lower limit is not particularly defined, and is, for example, 0.05, 0.1, 0.2, or 0.5 times. In this case, the rigidity of the outer shell 12 at the boundaries 16fc and 16bc is increased, and the recoverability of the outer shell 12 is improved.

Here, the effect | action which the restoring property of the outer shell 12 improves by this invention is demonstrated.
As shown in FIG. 6, when the outer shell 12 of the delamination container 1 filled with the contents L in the inner bag 14 of the container body 3 is compressed, the contents L are discharged through the discharge port 23b of the cap 23, When the content L in the bag 14 decreases, the inner bag 14 contracts. The outer shell is compressed by pressing a specific pair of pressing surfaces (in this embodiment, the pressing surfaces 16f and 16b, and in Patent Document 1, the pair of rigid wall portions 5) as in this embodiment and Patent Document 1. In the laminated peeling container having a non-circular cross section, as shown in FIG. 2 of Patent Document 1, the inner bag shrinks so that the inner bag is sandwiched between a pair of pressing surfaces and becomes flat. Further, as in Patent Document 1, when the radius of curvature of the connecting surface connecting the pair of pressing surfaces is smaller than the radius of the circle inscribed in the pair of pressing surfaces, the inner bag is located inside the container body on the connecting surface. Since the inner bag does not dent, the shape as shown in FIG. Since the inner bag of such a shape has a weak restoring force, the function of the inner bag assisting the restoration of the outer shell is hardly exhibited. Further, the recovery of the outer shell may be hindered by the inner bag being stuck. On the other hand, when the curvature radius RC of the connecting surface 16c is larger than the radius RI as in the present embodiment, the degree to which the connecting surface 16c bulges outward in the width direction of the container body 3 is relatively small. When the inner bag 14 is contracted, the inner bag 14 is likely to be recessed toward the inside of the container body 3 on the connecting surface 16c. Then, when the inner bag 14 is recessed toward the inside of the container main body 3, a bellows structure J shown in FIG. 6B is formed in the inner bag 14.

  In this state, as shown in FIG. 7, when the outer shell 12 is compressed by pressing the pressing surfaces 16f and 16b, the inner bag 14 is compressed and the contents L are further discharged. At this time, by restoring the bellows structure J, a restoring force extending in the front-back direction is generated in the bellows structure J, and the restoring force of the outer shell 12 is improved by applying this restoring force to the outer shell 12. Further, when the bellows structure J is formed in the inner bag 14, the inner bag 14 does not get stuck in the outer shell 12, so that the restoring property of the outer shell 12 is also improved from this viewpoint.

2. Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. This embodiment is similar to the first embodiment, and is mainly different in that the configuration of the valve member 4 and the shape of the container body 3 are different. Hereinafter, the difference will be mainly described.

  First, the valve member 4 used in this embodiment will be described with reference to FIG. 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. 11D) 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. The cylindrical body 5 is attached to the container main 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. Moreover, the axial part 5a may become a taper shape toward the container outer side, and the outer peripheral shape of the axial part 5a may be a column shape which does not change along an axial direction.

  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. 11 (f), when 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 comes into contact with 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. As the inner space 21 is decompressed 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 cavity portion 5g and enters the state shown in FIG. 11 (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.

  Next, the shape of the container body 3 will be described with reference to FIGS. The container portion 3 of the container body 3 is provided with a ridge line portion 7e, pressing surfaces 16f and 16b, a connecting surface 16c, and a reduced diameter surface 7f, as in the first embodiment. At least one of the pressing surfaces 16f and 16b (both in the present embodiment) includes a base surface 16fb and 16bb and a panel surface 16fp and 16bp formed by recessing the base surfaces 16fb and 16bb. In the cross section of FIG. 9B, the reduced diameter surface 7 f and the base surfaces 16 fb and 16 bb are linear, and the panel surfaces 16 fp and 16 bp are curved toward the inside of the container body 3. The connection surface 16c is curved toward the inside of the container body 3 as in the first embodiment. The outside air introduction hole 15 is provided in the base surface 16fb. Since the base surface 16fb is not easily deformed when the outer shell 12 is compressed, the introduction of the outside air is not hindered by the deformation of the outer shell 12, and the outside air Is smoothly introduced into the intermediate space 21. Further, at least one of the panel surfaces 16fp, 16bp and the connecting surface 16c (all in the present embodiment) has a constricted shape, so that the resilience of the outer shell 12 is enhanced.

  As shown in FIG. 9C, in this embodiment, the radius of curvature RC of the connecting surface 16c and the radius of curvature RF, RB of the pressing surfaces 16f, 16b are both of the circle IC inscribed in the pressing surfaces 16f, 16b. It is 2.1 times the radius RI. The curvature radii RC, RF and RB are preferably larger than the radius RI of the circle IC. RC / RI is preferably 1.2 times or more, more preferably 1.5 times or more, and further preferably 2 times or more. The upper limit of RC / RI is not particularly defined and is, for example, 100, 50, or 10 times, but may be infinite. The curvature radii RC, RF, and RB may be the same or different from each other.

  Further, as shown in FIG. 9C, the curvature radii RFC and RBC at the boundaries 16fc and 16bc between at least one of the pressing surfaces 16f and 16b (both in the present embodiment) and the connecting surface 16c are smaller than the radius RI. It has become. In this embodiment, the curvature radii RFC and RBC are both about 0.2 times the radius RI. RFC / RI and RBC / RI are preferably 0.8 times or less, and more preferably 0.5 times or less. A minimum in particular is not prescribed | regulated, For example, it is 0.05 or 0.1 time. In this case, the rigidity at the boundaries 16fc and 16bc is increased, and the recoverability of the outer shell 12 is improved.

The shape of the cross section (not shown) passing through the base surfaces 16fb and 16bb is a substantially rectangular shape that is long in the front-rear direction, and the shape of the cross section passing through the panel surfaces 16fp and 16bp (FIG. 9C) is approximately It has a square shape. With such a configuration, the stroke when the container body 3 is compressed in the front-rear direction is increased. Further, since the inner volume can be increased even at the same overall height as compared with the conventional cylindrical container, the amount of air in the intermediate space 21 at the time when the content L of the inner bag 14 is reduced is the conventional cylinder. More than a shaped container.
For this reason, since the content L can be discharged even if the inner bag 14 is not completely crushed, the dischargeability is improved.

  Also in this embodiment, the resilience of the outer shell 12 is improved by the same action as in the first embodiment. FIG. 12A is a view corresponding to FIG. 6B, and when the contents L of the inner bag 14 are discharged and the inner bag 14 contracts, the inner bag 14 is placed on the container main body on the connecting surface 16c. 3 shows a state in which the accordion structure J is formed in the inner bag 14.

  When the outer shell 12 is compressed by pressing the panel surfaces 16fp and 16bp from the state of FIG. 12A, the inner bag 14 is compressed and the contents L are further discharged. At this time, as shown in FIG. 12 (b), the bellows structure J is contracted to generate a restoring force in a direction extending in the front-rear direction, and the restoring force is applied to the outer shell 12 to apply the outer shell 12 to the outer shell 12. The resilience of 12 is improved.

A delamination container (Example 1) having the configuration of the first embodiment, a cylindrical delamination container (Comparative Example 1), and a delamination container (Comparative Example 2) having a shape in which a constriction is added to a cylinder are prepared. An aspect in which the inner bag 14 contracts when the shell 12 is crushed was observed. In Example 1, the bellows structure J was formed in the inner bag 14 in the site | part corresponding to the connection surface 16c, and the recoverability of the outer shell 12 was favorable. In Comparative Examples 1-2, the bellows structure L was not formed in the inner bag 14, and the restoring property of the outer shell 12 was inhibited by the inner bag 14 being pulled.
In addition, the layer structure of an Example and a comparative example was as follows in order from the container outer side. The thickness is the thickness in the cross section of FIG.
・ LDPE (tensile modulus 250MPa, thickness 0.5mm)
EVOH (tensile elastic modulus 1900 MPa, thickness 0.03 mm)
-Adhesive layer (tensile modulus 20 MPa, thickness 0.03 mm)
-Mixed resin layer of COP and SEBS (tensile elastic modulus 1400 MPa, thickness 0.1 mm)

1: Laminated peeling container, 3: Container body, 4: Valve member, 7: Housing 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

Claims (14)

A delamination container comprising a container body having an outer shell and an inner bag, and the inner bag shrinks as the content decreases,
The container body includes a storage unit that stores the content, and a mouth part that discharges the content from the storage unit.
The accommodating portion is a front-side pressing surface and a back-side pressing surface that face each other and are pressed when the container body is compressed
A pair of connecting surfaces connecting the front-side pressing surface and the back-side pressing surface;
The connecting surface is configured so that the inner bag is deformed so as to be recessed toward the inner side of the container body as the contents are reduced. 2. The delamination according to claim 1, wherein a radius of curvature RC of the connection surface is larger than a radius RI of a circle inscribed in the front-side pressing surface and the back-side pressing surface in a cross section perpendicular to the central axis of the container body. container. The delamination container according to claim 2, wherein RC / RI ≧ 1.2. The connecting surface according to any one of claims 1 to 3, wherein the connecting surface is parallel to a central axis of the container body and is curved toward an inner side of the container body in a cross section passing through the connecting surface. The laminated peeling container as described. The radius of curvature RA of at least one of the front side pressing surface and the rear side pressing surface is an inscribed circle inscribed in the front side pressing surface and the back side pressing surface in a cross section perpendicular to the central axis of the container body. The delamination container according to any one of claims 1 to 4, wherein the delamination container is larger than the radius RI. The delamination container according to claim 5, wherein RA / RI ≧ 1.2. At least one of the front-side pressing surface and the back-side pressing surface is parallel to the central axis of the container body and is inside the container body in a cross section passing through the front-side pressing surface and the back-side pressing surface. The delamination container according to claim 1, wherein the delamination container is curved toward the surface. The accommodating portion includes a ridge line portion provided so as to surround the central axis of the container body,
The delamination container according to any one of claims 1 to 7, wherein the front-side pressing surface and the back-side pressing surface are provided at positions farther from the mouth than the ridge line portion. The accommodating portion includes a reduced diameter surface that reduces the diameter toward the mouth portion at a position closer to the mouth portion than the ridge line portion,
The delamination container according to claim 8, wherein the reduced diameter surface is curved toward the inside of the container main body in a cross section that is parallel to the central axis of the container main body and passes through the connection surface. 10. The delamination container according to claim 9, wherein the outer shell includes an outside air introduction hole communicating with an outer space of the container body on the reduced diameter surface. At least one of the front side pressing surface and the back side pressing surface includes a base surface and a panel surface formed by recessing the base surface,
The distance between the front-side pressing surface and the back-side pressing surface is longer than the distance between the pair of connecting surfaces in a cross section perpendicular to the central axis of the container body and passing through the base surface. The delamination container according to any one of claims 1 to 10. In a cross section perpendicular to the central axis of the container body and passing through the panel surface, a distance between the front-side pressing surface and the back-side pressing surface is substantially equal to a distance between the pair of connecting surfaces. The delamination container according to claim 11. The said outer shell is a lamination peeling container of Claim 11 or Claim 12 provided with the external air introduction hole connected to the external space of the said container main body in the said base surface. The said inner bag is a lamination peeling container as described in any one of Claims 1-13 provided with the layer formed with resin containing a cycloolefin polymer.