JP6802476B2 - Laminate peeling container - Google Patents

Description

The present invention relates to a laminated peeling container in which an inner bag shrinks as the contents decrease.

A laminated peeling container having an outer shell and an inner bag and shrinking the inner bag as the contents decrease is also known (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.

JP-A-2015-227206

However, in the configuration of Patent Document 1, the movement of the valve member may be hindered by pressing the valve member toward the outer shell by the inner bag. If the movement of the valve member is hindered, after the contents are discharged, the outside air is not properly introduced at the timing when the outside air should be introduced into the space between the outer shell and the inner bag through the outside air introduction hole, and as a result, the outer shell Restorability may deteriorate.

The present invention has been made in view of such circumstances, and provides a laminated peeling container capable of quickly introducing outside air into the space between the outer shell and the inner bag after discharging the contents.

The present invention has been made in view of such circumstances, and provides a laminated peeling container having excellent resilience of the outer shell.

According to the present invention, a container body having an outer shell and an inner bag and the inner bag shrinking as the contents decrease, an intermediate space between the outer shell and the inner bag, and the container body. It is a laminated peeling container provided with a valve member that regulates the inflow and outflow of air to and from the external space, and the container body has an accommodating portion for accommodating the contents and a port for discharging the contents from the accommodating portion. The accommodating portion includes a columnar body portion and a shoulder portion connecting the body portion and the mouth portion, and the shoulder portion is provided with a valve accommodating recess for accommodating the valve member, and the outer shell is provided. An outside air introduction hole for introducing outside air into the intermediate space between the inner bag and the inner bag is provided in the valve storage recess, the valve member is mounted in the outside air introduction hole, and the valve storage recess is formed on the bottom surface. The valve storage recess is provided with circumferential side surfaces provided on both sides of the bottom surface in the circumferential direction, and the side surface of the valve storage recess is not provided on the body side, or the side surface of the body side provided on the body side. Provided is a laminated stripping container configured so that the inclination angle with respect to the bottom surface is 45 degrees or less.

In Patent Document 1, since the entire circumference of the bottom surface of the valve storage recess is surrounded by the side surface, the outer shell and the inner bag are laminated like a bowl at a position adjacent to the outside air introduction hole. ing. For this reason, the inner bag is difficult to separate from the outer shell, and the inner bag may press the valve member toward the outer shell. On the other hand, in the present invention, since the bottom surface of the valve accommodating recess is smoothly connected to the outer peripheral surface of the accommodating portion on the body side, the inner bag is less likely to be restrained by the outer shell on the body side of the valve accommodating recess. As a result, the inner bag is easily separated from the outer shell, and the outside air is quickly introduced into the space between the outer shell and the inner bag, so that the resilience of the outer shell is improved.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, the valve accommodating recess is provided so as to reach from the shoulder portion to the boundary between the body portion and the shoulder portion.
Preferably, the wall thickness at the portion adjacent to the valve accommodating recess along the boundary is T1, and the wall thickness at the central portion in the valve accommodating recess in the direction along the boundary is T2. T2 / T1 ≧ 1.2.
Preferably, T2 / T1 ≧ 1.3.
Preferably, the inclination angle of the circumferential side surface with respect to the bottom surface at the position where the outside air introduction hole is provided is larger than the inclination angle of the body side side surface with respect to the bottom surface.
Preferably, the inclination angle of the circumferential side surface with respect to the bottom surface is 50 degrees or more.
Preferably, the highest portion of the circumferential side surface is provided on the body side of the position where the outside air introduction hole is provided.
Preferably, the valve accommodating recess is provided in a substantially rectangular shape.
Preferably, the valve member includes a shaft portion to be inserted into the outside air introduction hole, a lid portion provided on the intermediate space side of the shaft portion and having a cross-sectional area larger than that of the shaft portion, and the shaft portion. It is provided on the outer space side and includes a locking portion that prevents the valve member from entering the intermediate space.

(A) is a perspective view of the container body 3 of the laminated peeling container 1 of the first embodiment, and (b) is an enlarged view of the vicinity of the valve storage recess 2 in (a). The container main body 3 of the laminated peeling container 1 of the first embodiment is shown, (a) is a front view, (b) is a right side view, and (c) is a plan view. It is sectional drawing AA in FIG. 2A in the state which the valve member 4 is attached to the container body 3 of 1st Embodiment. It is an enlarged view of the vicinity of the valve accommodating recess 2 in FIG. 3, (a) shows the state before the initial discharge, and (b) shows the state after the initial discharge. 2 (a) is a cross-sectional view taken along the line BB, where (a) shows a state before the valve member is mounted, (b) shows a state after the valve member is mounted and before the initial discharge, and (c) shows a state after the initial discharge. It is a perspective view of a valve member 4. (A) is a schematic view corresponding to the AA cross section in FIG. 2A, showing the inclination angles α1 and α3 of the body side side surface 2b and the mouth side side surface 2d with respect to the bottom surface 2a of the valve storage recess 2. , (A) show the inclination angle α2 of the circumferential side surface 2c with respect to the bottom surface 2a of the valve storage recess 2 at the position where the outside air introduction hole 15 is provided, in the CC cross section in FIG. 2A. It is a corresponding schematic diagram. (A) is a perspective view of the container body 3 of the laminated peeling container 1 of the second embodiment, and (b) is an enlarged view of the vicinity of the valve storage recess 2 in (a). The container body 3 of the laminated peeling container 1 of the second embodiment is shown, (a) is a front view, (b) is a right side view, and (c) is a plan view. 9 (a) is a cross-sectional view taken along the line BB, where (a) shows a state before the valve member is mounted, (b) shows a state after the valve member is mounted and before the initial discharge, and (c) shows a state after the initial discharge.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each feature.

1. 1. First Embodiment The first embodiment of the present invention will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 to 4, the laminated peeling container 1 of the present embodiment includes a container body 3 and a valve member 4. The container body 3 includes an accommodating portion 7 for accommodating the contents and a mouth portion 9 having an opening for discharging the contents from the accommodating portion 7.

As shown in FIG. 3, the container body 3 includes an outer layer 11 and an inner layer 13 in the accommodating portion 7 and the mouth portion 9, the outer layer 11 constitutes the outer shell 12, and the inner layer 13 constitutes the inner bag 14. To. As the inner layer 13 separates from the outer layer 11 as the contents decrease, the inner bag 14 contracts away from the outer shell 12. In addition, a preliminary peeling step of peeling the inner layer 13 from the outer layer 11 may be performed before the contents are stored in the accommodating portion 7. 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. Then, as the content decreases, the inner layer 13 separates from the outer layer 11. 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 plurality of layers. For example, both sides of the repro layer may be sandwiched between layers formed of a virgin material. Here, the repro layer refers to a layer obtained by recycling burrs generated during molding of a container. Further, the outer layer 11 is formed to be thicker than the inner layer 13 so as to have high resilience.

The inner layer 13 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the inner surface side of the container 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 an ethylene-vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, preferably 32 mol% or less from the viewpoint of oxygen barrier property. The lower limit of the ethylene content is not particularly specified, but 25 mol% or more is preferable because the flexibility of the EVOH layer tends to decrease as the ethylene content decreases.

The inner surface layer is a layer that comes into contact with the contents of the laminated stripping container 1, and is, for example, low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, cycloolefin polymer and a mixture thereof. It is preferably made of low-density polyethylene or linear low-density polyethylene.

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 in which a carboxyl group is introduced into the above-mentioned polyolefin (eg, maleic anhydride-modified polyethylene) is added, or ethylene acetic acid. It is a vinyl copolymer (EVA). An example of an 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 be engaged with a cap having a check valve. The cap may be attached by a plug type or may be attached by a screw type.

As shown in FIGS. 1 and 2, the accommodating portion 7 includes a columnar (eg, columnar) body portion 19 and a shoulder portion 17 connecting the body portion 19 and the mouth portion 9. In the body portion 19, the cross-sectional area (or the diameter of the circumscribed circle) is substantially constant in the longitudinal direction of the accommodating portion. The shoulder portion 17 has, for example, a truncated cone shape (eg, a truncated cone shape), and the cross-sectional area (or the diameter of the circumscribed circle) of the shoulder portion 17 gradually decreases toward the mouth portion 9.

As shown in FIG. 1 (b), the shoulder portion 17 is provided with a valve accommodating recess 2. The valve accommodating recess 2 is provided so as to reach the boundary 18 between the shoulder portion 17 and the body portion 19 and further reach the body portion 19. The recess 2 is provided in a substantially rectangular shape. An outside air introduction hole 15 is provided in the recess 2. 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 with the outer space S of the container body 3. The outside air introduction hole 15 is equipped with a valve member 4 that regulates the inflow and outflow of air between the intermediate space 21 and the external space S. The recess 2 is provided 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 flow groove 2e extending from the recess 2 in the direction of the mouth portion 9 is provided so that the recess 2 is not sealed with the shrink film.

As shown in FIG. 6 , the valve member 4 is provided on the intermediate space 21 side of the shaft portion 8a arranged in the outside air introduction hole 15 and the shaft portion 8a, and the lid portion 8c having a larger cross-sectional area than the shaft portion 8a. 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. The valve member 4 can be attached to the container body 3 by inserting the lid portion 8c into the intermediate space 21 while the lid portion 8c expands 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 by simply 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 becomes smaller as it approaches the shaft portion 8a. Further, the locking portion 8b is configured so 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 to the outside from the outside air introduction hole 15. Due to this pressure difference and the air flow, the lid 8c moves toward the outside air introduction hole 15, and the lid 8c closes the outside air introduction hole 15. Since the lid portion 8c has a shape in which the cross-sectional area decreases as it 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 increases, and as a result, the inner bag 14 is compressed and the contents in the inner bag 14 are discharged. Further, when the compressive force on the outer shell 12 is released, the outer shell 12 tries to be restored by its own elasticity. At this time, the lid portion 8c is separated from the outside air introduction hole 15, the blockage of the outside air introduction hole 15 is released, and the outside air is introduced into the intermediate space 21. Further, the locking portion 8b is provided with a flow passage 8d so that the locking portion 8b does not block the outside air introduction hole 15, and the locking portion 8b can be distributed even when the locking portion 8b is in contact with the outer shell 12. The outside air can be introduced into the intermediate space 21 through the road 8d and the outside air introduction hole 15.

By the way, as shown in FIG. 1B, the recess 2 has a bottom surface 2a provided with an outside air introduction hole 15, a body side side surface 2b provided on the body portion 19 side of the bottom surface 2a, and a circumference of the bottom surface 2a. A circumferential side surface 2c provided on both sides in the direction and a mouth side side surface 2d provided on the mouth 9 side of the bottom surface 2a are provided. That is, the valve storage recess 2 is configured such that the bottom surface 2a is surrounded by the side surfaces 2b, 2c, and 2d.

As shown in FIG. 7A, the side surface 2b has an inclination angle α1 with respect to the bottom surface 2a of 45 degrees or less, preferably 30 degrees or less, more preferably 20 degrees or less, still more preferably 15 degrees or less. Is. As described above, since the inclination angle of the side surface 2b is small, the bottom surface 2a of the recess 2 is smoothly connected to the outer peripheral surface of the accommodating portion 7 on the body portion 19 side. According to such a configuration, since the inner bag 14 is not restrained by the outer shell 12 on the body portion 19 side (there is no tension), the inner bag 14 is easily separated from the outer shell 12 at this portion. Starting from this portion, the inner bag 14 smoothly separates from the outer shell 12. The lower limit of the inclination angle α1 is not particularly specified, but for example, if the inclination angle α1 is too small, the length of the recess 2 in the vertical direction becomes too long, so the inclination angle α1 is preferably 5 degrees or more. Specifically, the inclination angle α1 is, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45 degrees, even if it is within the range between any two of the numerical values exemplified here. Good.

There is no side surface on the body 19 side of the recess 2, and the bottom surface 2a may be directly connected to the outer peripheral surface of the accommodating portion 7. Even in this case, the bottom surface 2a is smoothly connected to the outer peripheral surface of the accommodating portion 7 as in the case where the inclination angle α1 is small. However, if the bottom surface 2a is extended toward the body portion 19 and the bottom surface 2a intersects the body portion 19 without providing the side surface 2b, the bottom surface 2a and the body portion 19 intersect at the position shown at the position 20 in FIG. Therefore, the recess 2 extends to the position 20, and the length of the recess 2 in the vertical direction may become too long, which is not preferable.

As shown in FIG. 7B, the inclination angle α2 of the circumferential side surface 2c with respect to the bottom surface 2a at the position where the outside air introduction hole 15 is provided is not particularly limited, but is preferably larger than the inclination angle α1. It is preferably 50 degrees or more, more preferably 60 degrees or more, and even more preferably 70 degrees or more. The upper limit of the inclination angle α2 is not particularly specified, but is, for example, 85 degrees. Specifically, the inclination angle α2 is, for example, 50, 55, 60, 65, 70, 75, 80, 85 degrees, and may be within the range between any two of the numerical values exemplified here.

As shown in FIG. 7A, the inclination angle α3 of the mouth side side surface 2d with respect to the bottom surface 2a is not particularly limited, but is preferably larger than the inclination angle α1, preferably 50 degrees or more, and more preferably 60 degrees. It is more than that, and more preferably 70 degrees or more. The upper limit of the inclination angle α3 is not particularly specified, but is, for example, 85 degrees. Specifically, the inclination angle α3 is, for example, 50, 55, 60, 65, 70, 75, 80, 85 degrees, and may be within the range between any two of the numerical values exemplified here.

The side surface 2c gradually rises toward the body 19 side from the position where the outside air introduction hole 15 is provided, becomes the highest in the vicinity of the boundary 18, and gradually decreases toward the body 19 from there. It is configured as follows. When the container body 3 is formed by blow molding, the higher the side surface 2c is, the larger the elongation of the parison is, and the thinner the wall thickness is.

Assuming that the wall thickness at the portion A adjacent to the recess 2 along the boundary 18 is T1 and the wall thickness at the central portion B in the recess 2 in the direction along the boundary 18 is T2, the blow at the portion A is blown. Since the ratio is larger than the blow ratio at the portion B, the wall thickness T2 is larger than the wall thickness T1, preferably T2 / T1 ≧ 1.2. T2 / T1 is preferably 1.4 or more, and more preferably 1.6 or more. In this case, since the wall thickness at the portion A is sufficiently thin, the edge 2f of the recess 2 of the inner bag 14 is easily bent, the recess 2 maintains the shape as it is, and the inner bag 14 contracts smoothly. The upper limit of T2 / T1 is not particularly specified, but is, for example, 3. Specifically, T2 / T1 is, for example, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2 .2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3 and within the range between any two of the numerical values exemplified here. There may be.

2. 2. Second Embodiment The second embodiment of the present invention will be described with reference to FIGS. 8 to 10. The present embodiment is similar to the first embodiment, and the main difference is that the shape of the recess 2 in the vicinity of the boundary 18 is different. Hereinafter, the differences will be mainly described.

In the present embodiment, as shown in FIG. 8B, the vicinity of the side surface 2b has a shape that bulges as compared with the first embodiment, and as a result, as shown in FIG. 10, the side surface 2c at the boundary 18 is formed. It is lower than the first embodiment and its inclination angle is gentler than that of the first embodiment. With such a configuration, in the present embodiment, the wall thickness at the portion A adjacent to the recess 2 along the boundary 18 is T1, and the wall thickness at the central portion B in the recess 2 in the direction along the boundary 18 is T1. T2 is almost the same. That is, T2 / T1 is almost 1. Therefore, the wall thickness at the portion A is thicker than that in the first embodiment, and the edge 2f of the recess 2 of the inner bag 14 is less likely to bend. In the case of such a shape, the portion B tends to bend toward the inside of the container when the inner bag 14 contracts. Then, when the portion B is bent inward, a pinhole is likely to occur in this portion, and the inner bag 14 is less likely to be smoothly separated from the outer shell 12. As described above, when T2 / T1 is substantially 1, the above problem is likely to occur. Therefore, T2 / T1 ≧ 1.2 is preferable as in the first embodiment.

1: Laminated peeling container 2: Valve storage recess 2a: Bottom surface 2b: Body side side surface 2c: Circumferential side surface 2d: Mouth side side surface 2e: Air flow groove 2f: Edge 3: Container body 4: Valve member 7: Storage part 8a: Shaft part 8b: Locking part 8c: Lid part 8d: Flow passage 9: Mouth part 9d: Engaging part 11: Outer layer 12: Outer shell 13: Inner layer 14: Inner bag 15: Outside air introduction hole 17: Shoulder part 18 : Boundary 19: Body 21: Intermediate space S: External space

Claims (9)

Between a container body having an outer shell and an inner bag and the inner bag shrinking as the contents decrease, an intermediate space between the outer shell and the inner bag, and an outer space of the container body. A laminated peeling container provided with a valve member that regulates the inflow and outflow of air.
The container body is provided with a storage portion for storing the contents, a mouth for out-discharge the contents from the receiving portion,
The accommodating portion includes a columnar body portion and a shoulder portion connecting the body portion and the mouth portion.
A valve storage recess for storing the valve member is provided on the shoulder portion.
An outside air introduction hole for introducing outside air into the intermediate space between the outer shell and the inner bag is provided in the valve storage recess.
The valve member is attached to the outside air introduction hole.
The valve accommodating recess includes a bottom surface and circumferential side surfaces provided on both sides of the bottom surface in the circumferential direction.
The valve housing recess, the front of the body side surface provided on kidou portion configured such inclination angle is 5-45 degrees with respect to the bottom surface, delamination container. The laminated peeling container according to claim 1, wherein the valve storage recess is provided so as to reach from the shoulder portion to the boundary between the body portion and the shoulder portion. Assuming that the wall thickness at the portion adjacent to the valve accommodating recess along the boundary is T1 and the wall thickness at the central portion in the valve accommodating recess in the direction along the boundary is T2, T2 / T1 The laminated stripping container according to claim 2, wherein ≧ 1.2. The laminated stripping container according to claim 3, wherein T2 / T1 ≥ 1.3. Any of claims 1 to 4, wherein the inclination angle of the circumferential side surface with respect to the bottom surface at the position where the outside air introduction hole is provided is larger than the inclination angle of the body side side surface with respect to the bottom surface. The laminated peeling container according to one. The laminated peeling container according to claim 5, wherein the inclination angle of the circumferential side surface with respect to the bottom surface is 50 degrees or more. The laminated peeling container according to any one of claims 1 to 6, wherein the highest portion of the circumferential side surface is provided on the body side of the position where the outside air introduction hole is provided. The laminated peeling container according to any one of claims 1 to 7, wherein the valve storage recess is provided in a substantially rectangular shape. The valve member includes a shaft portion inserted into the outside air introduction hole, a lid portion provided on the intermediate space side of the shaft portion and having a larger cross-sectional area than the shaft portion, and the external space side of the shaft portion. The laminated peeling container according to any one of claims 1 to 8, further comprising a locking portion for preventing the valve member from entering the intermediate space.