JP6451075B2 - Delamination container - Google Patents

Description

  The present invention relates to a delamination container.

Conventionally, a container body having an outer shell and an inner bag, and the inner bag peels off from the outer shell and shrinks as the contents are reduced, an intermediate space between the outer shell and the inner bag, and an outer space of the container body A lamination peeling container provided with a check valve that adjusts the flow of air between the two is known (for example, Patent Documents 1 and 2).
In patent document 1, the valve is incorporated in the cap attached to the opening | mouth part of a container main body.
In patent document 2, the valve is provided inside the trunk | drum of an outer shell.

JP 2013-35557 A JP-A-4-267727

  In the configuration of Patent Document 1, the structure of the cap becomes complicated, leading to an increase in production cost. In the configuration of Patent Document 2, a troublesome process of adhering a check valve to the inside of the body portion of the outer shell is required, leading to an increase in production cost.

  This invention is made | formed in view of such a situation, and provides the lamination peeling container excellent in productivity.

According to the present invention, a container body having an outer shell and an inner bag, and the inner bag peels off from the outer shell and shrinks as the content decreases,
A delamination container comprising a valve member that adjusts the flow of air between an outer space of the container body and an intermediate space between the outer shell and the inner bag,
The container body includes a storage unit that stores the contents, and a mouth portion that discharges the contents from the storage unit,
The outer shell includes an outside air introduction hole that communicates the intermediate space and the outer space in the housing portion,
The valve member includes a shaft portion that is inserted into the outside air introduction hole and is slidable with respect to the outside air introduction hole, and a lid that is provided on the intermediate space side of the shaft portion and has a larger cross-sectional area than the shaft portion. And a locking portion that is provided on the outer space side of the shaft portion and prevents the valve member from entering the intermediate space,
The outer shell is provided with a delamination container including at least one of the following configurations (1) to (2).
(1) The outside air introduction hole is provided on the inclined surface of the outer shell.
(2) A flat region having a width of 3 mm or more around the outside air introduction hole is provided on the outer surface of the outer shell.

  The present inventor has intensively studied and considered to realize the check valve by a valve member which is a separate body from the container body. Then, the valve member is composed of a shaft portion, a lid portion, and a locking portion, and at the time of manufacture, the valve member is pushed into the outside air introduction hole of the outer shell from the outside of the outer shell and inserted into the outer shell. Can be locked to. According to such a structure, since it is not necessary to provide a check valve in the cap and the valve member can be easily attached, the structure is simple and the productivity is high.

  Further, when a further detailed examination was conducted, it was found that when the surface on which the outside air introduction hole is provided is vertical, the peeled inner bag may come into contact with the valve member to hinder the movement of the valve member. As a result of investigations to solve this problem, it has been found that the above problem can be prevented by installing the outside air introduction hole on the inclined surface of the outer shell.

  In addition, as a result of further detailed investigation, there is a case where a flat region is provided around the outside air introduction hole on the outer surface of the outer shell, but when this flat region is narrow, the valve member has the outside air introduction hole. It was found that when closing, the adhesion between the valve member and the outer shell is not good, and air leakage through the outside air introduction hole may occur. As a result of investigations to solve this problem, when a flat region is provided on the outer surface of the outer shell in a range of 3 mm or more around the outside air introduction hole, it is between the valve member and the outer shell. It has been found that the adhesion can be improved and the occurrence of air leakage through the outside air introduction hole can be suppressed.

Hereinafter, various embodiments of the present invention will be exemplified. The following embodiments can be combined with each other.
Preferably, the structure (1) is provided, and the inclination angle of the inclined surface is 45 to 89 degrees.
Preferably, the structure (2) is provided, and the inner surface of the outer shell has a radius of curvature of 200 mm or more within a range of 2 mm around the outside air introduction hole.
Preferably, the lid portion is configured to substantially close the outside air introduction hole when the outer shell is compressed.
Preferably, the cross-sectional area of the lid portion decreases as it approaches the shaft portion.
Preferably, the boundary between the lid portion and the shaft portion has an R shape that bulges outward.
Preferably, the locking portion is configured such that air can be introduced into the intermediate space when the outer shell is restored after being compressed.
Preferably, the locking portion has a protrusion or a groove on the outer shell side.

It is a perspective view which shows the structure of the lamination peeling container 1 of 1st Embodiment of this invention, (a) is a general view, (b) is a bottom part, (c) shows the enlarged view of the valve member attachment recessed part 7a vicinity. (C) shows a state in which the valve member 5 is removed. 1 shows a delamination container 1 of FIG. 1, in which (a) is a front view, (b) is a rear view, (c) is a plan view, and (d) is a bottom view. It is AA sectional drawing in FIG.2 (d). 1 to FIG. 2 show a state before the bottom seal protrusion 27 is bent, and FIG. 3 shows a state after the bottom seal protrusion 27 is bent. It is an enlarged view of the area | region containing the opening part 9 of FIG. The state which peeling of the inner layer 13 advanced from the state of FIG. FIG. 4 is an enlarged view of a region including a bottom surface 29 in FIG. 3, (a) shows a state before the bottom seal protrusion 27 is bent, and (b) shows a state after the bottom seal protrusion 27 is bent. Show. 3 is a cross-sectional view showing a layer configuration of an inner layer 13. FIG. It is a perspective view which shows the various structures of the valve member 5. FIG. The manufacturing process of the lamination peeling container 1 of FIG. 1 is shown. The process following FIG. 9 of the lamination peeling container 1 of FIG. 1 is shown. Another example of the inner layer preliminary peeling / outside air introduction hole forming step is shown. The usage method of the lamination peeling container 1 of FIG. 1 is shown. The structure of the lamination peeling container 1 of 2nd Embodiment of this invention is shown, (a) is a perspective view, (b) is an enlarged view of the valve member attachment recessed part 7a vicinity, (c) is AA in (b). It is sectional drawing. (B)-(c) shows the state which removed the valve member 5. FIG. The valve member 5 in the Example of this invention is shown, (a) is a perspective view, (b) is a front view, (c) is the perspective view seen from the bottom face side.

  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 5. FIG. 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. 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, 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.

  As shown in FIG. 4, the mouth portion 9 is provided with a male screw portion 9d. A cap or a pump having a female screw is attached to the male screw portion 9d. FIG. 4 shows a part of the cap 23 having the inner ring 25. The outer diameter of the inner ring 25 is substantially the same as the inner diameter of the mouth portion 9, and the outer surface of the inner ring 25 abuts against the abutting surface 9a of the mouth portion 9, thereby preventing leakage of the contents. In the present embodiment, the enlarged diameter portion 9b is provided at the tip of the mouth portion 9, and the inner diameter of the enlarged diameter portion 9b is larger than the inner diameter of the contact portion 9e. The outer surface is not in contact with the enlarged diameter portion 9b. In the case where there is no enlarged diameter portion 9b in the mouth portion 9, there is a problem that the inner ring 25 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.

  Further, the mouth portion 9 includes an inner layer support portion 9c that suppresses the slippage of the inner layer 13 at a position closer to the housing portion 7 than the contact portion 9e. The inner layer support portion 9 c is formed by providing a constriction at the mouth portion 9. 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 25 and the inner layer 13. In the present embodiment, even in such a case, the inner layer support portion 9c suppresses the displacement of the inner layer 13, so that the inner bag 14 can be prevented from falling into the outer shell 12.

  As shown in FIGS. 3 to 5, the accommodating portion 7 includes a trunk portion 19 having a substantially constant cross-sectional shape in the longitudinal direction of the accommodating portion, and a shoulder portion 17 that connects the trunk portion 19 and the mouth portion 9. Is provided. The shoulder 17 is provided with a bent portion 22. The bending portion 22 is a portion where the bending angle α shown in FIG. 3 is 140 degrees or less and the radius of curvature on the inner surface side of the container is 4 mm or less. When there is no bent portion 22, the separation between the inner layer 13 and the outer layer 11 spreads from the body portion 19 to the mouth portion 9, and the inner layer 13 and the outer layer 11 may be peeled also at the mouth portion 9. However, if the inner layer 13 and the outer layer 11 are peeled at the mouth portion 9, the inner bag 14 may fall into the outer shell 12, and therefore, the peeling of the inner layer 13 and the outer layer 11 at the mouth portion 9 is not desirable. In this embodiment, since the bent portion 22 is provided, when the separation between the inner layer 13 and the outer layer 11 spreads from the body portion 19 to the bent portion 22, the inner layer 13 is bent at the bent portion 22 as shown in FIG. Thus, the force for peeling the inner layer 13 from the outer layer 11 is not transmitted to the upper part of the bent portion 22, and as a result, the peeling between the inner layer 13 and the outer layer 11 in the upper portion of the bent portion 22 is suppressed. The 3 to 5, the bent portion 22 is provided in the shoulder portion 17, but the bent portion 22 may be provided at the boundary between the shoulder portion 17 and the trunk portion 19.

The lower limit of the bending angle α is not particularly defined, but is preferably 90 ° or more in consideration of ease of manufacture. The lower limit of the radius of curvature is not particularly specified, but is preferably 0.2 mm or more in consideration of ease of production. In order to prevent the inner layer 13 and the outer layer 11 from peeling off at the mouth 9, the bending angle α is preferably 120 degrees or less, and the curvature radius is preferably 2 mm or less. Specifically, the bending angle α is, for example, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140 degrees, and is within a range between any two of the numerical values exemplified here. It may be. Specifically, the curvature radius is, for example, 0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2 mm, where It may be within a range between any two of the exemplified numerical values.

  As shown in FIG. 4, the bent portion 22 has a distance L2 from the container central axis C to the inner surface of the container at the bent portion 22 is 1.3, which is a distance L1 from the container central axis C to the inner surface of the container at the mouth 9. It is provided at a position that is double or more. The delamination container 1 of the present embodiment is formed by blow molding, and as L2 / L1 increases, the blow ratio at the bent portion 22 increases and the wall thickness decreases, so that L2 / L1 ≧ 1. 3, the thickness of the inner layer 13 at the bent portion 22 is sufficiently reduced, the inner layer 13 is more easily bent at the bent portion 22, and the inner layer 13 and the outer layer 11 are more reliably separated at the mouth portion 9. Is prevented. L2 / L1 is, for example, 1.3 to 3, and preferably 1.4 to 2. Specifically, L2 / L1 is, for example, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.5, 3, where It may be within a range between any two of the numerical values exemplified in.

  In one example, the wall thickness at the mouth portion 9 is 0.45 to 0.50 mm, the wall thickness at the bent portion 22 is 0.25 to 0.30 mm, and the wall thickness at the body portion 19 is 0. .15 to 0.20 mm. Thus, when the thickness of the bent portion 22 is sufficiently smaller than the thickness at the mouth portion 9, the bent portion 22 effectively exhibits its function.

  By the way, as shown in FIG. 4, in the accommodating portion 7, the valve member 5 that adjusts the flow of air between the intermediate space 21 between the outer shell 12 and the inner bag 14 and the outer space S of the container body 3. Is provided. The outer shell 12 is provided with an outside air introduction hole 15 that communicates the intermediate space 21 and the outer space S in the housing portion 7. The outside air introduction hole 15 is a through hole provided only in the outer shell 12 and does not reach the inner bag 14. The valve member 5 is inserted in the outside air introduction hole 15 and is slidable with respect to the outside air introduction hole 15. The valve member 5 is provided on the intermediate space 21 side of the shaft part 5a and has a larger sectional area than the shaft part 5a. The cover part 5c and the latching | locking part 5b which are provided in the external space S side of the axial part 5a and prevent the valve member 5 entering the intermediate space 21 are provided.

  The lid portion 5c 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 5a is approached. Moreover, the latching | locking part 5b is comprised so that air can be introduce | transduced into the intermediate | middle space 21 when decompress | restoring after the outer shell 12 is 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 5c moves toward the outside air introduction hole 15 due to the pressure difference and the air flow, and the lid 5c closes the outside air introduction hole 15. Since the cross-sectional area becomes smaller as the lid portion 5 c approaches the shaft portion 5 a, the lid portion 5 c 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 5 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, the locking portion 5b is provided with a protrusion 5d at a portion that contacts the outer shell 12 so that the locking portion 5b does not block the outside air introduction hole 15, and the protrusion 5d contacts the outer shell 12. Thus, a gap is provided between the outer shell 12 and the locking portion 5b. Instead of providing the protrusion 5d, a groove may be provided in the locking portion 5b to prevent the locking portion 5b from closing the outside air introduction hole 15. Specific examples of the configuration of the valve member 5 are shown in FIGS.

  The valve member 5 can be mounted on the container body 3 by inserting the lid 5c into the intermediate space 21 while the lid 5c pushes the outside air introduction hole 15 wide. Therefore, it is preferable that the tip of the lid portion 5c has a tapered shape. Such a valve member 5 can be mounted simply by pushing the lid 5c into the intermediate space 21 from the outside of the container body 3, and thus is excellent in productivity.

  The accommodating part 7 is covered with a shrink film after the valve member 5 is attached. At this time, the valve member 5 is mounted in a valve member mounting recess 7 a provided in the housing portion 7 so that the valve member 5 does not interfere with the shrink film. An air flow groove 7b extending from the valve member mounting recess 7a in the direction of the mouth 9 is provided so that the valve member mounting recess 7a is not sealed with the shrink film.

  The valve member mounting recess 7 a is provided in the shoulder portion 17 of the outer shell 12. The shoulder portion 17 is an inclined surface, and a flat region FR is provided in the valve member mounting recess 7a. Since the flat region FR is provided so as to be substantially parallel to the inclined surface of the shoulder portion 17, the flat region FR is also an inclined surface. Since the outside air introduction hole 15 is provided in the flat region FR in the valve member mounting recess 7a, the outside air introduction hole 15 is provided on the inclined surface. For example, when the outside air introduction hole 15 is provided on the vertical surface of the trunk portion 19, the peeled inner bag 14 may come into contact with the valve member 5 and hinder the movement of the valve member 5. Since the hole 15 is provided in the inclined surface, there is no such fear, and the smooth movement of the valve member 5 is ensured. In addition, the inclination angle of the inclined surface is not particularly limited, but is preferably 45 to 89 degrees, more preferably 55 to 85 degrees, and further preferably 60 to 80 degrees.

  Moreover, as shown in FIG.1 (c), the flat area | region FR in the valve member attachment recessed part 7a is provided over the width W of 3 mm or more (preferably 3.5 mm or 4 mm or more) circumference | surroundings of the external air introduction hole 15. FIG. . For example, when the outside air introduction hole 15 is φ4 mm and the outside air introduction hole 15 is formed at the center of the flat region FR, the valve member mounting recess 7 a is set to φ10 mm or more. The upper limit of the width W of the flat region FR is not particularly defined, but as the width W of the flat region FR increases, the area of the valve member mounting recess 7a increases. As a result, the space between the outer shell 12 and the shrink film is increased. Since the area of the gap also increases, the width W is preferably not too large, and the upper limit is, for example, 10 mm. Accordingly, the width W is, for example, 3 to 10 mm, specifically, for example, 3, 3.5, 4, 4.5, 5, 6, 7, 8, 9, 10 mm, and is exemplified here. It may be within a range between any two of the numerical values.

  Further, according to an experiment by the present inventor, the wider the flat region FR on the outer surface side of the outer shell 12, the larger the radius of curvature of the inner surface of the outer shell 12, and the outer air introduction hole on the outer surface side of the outer shell. When the flat region FR is provided over a range of 3 mm or more around 15, the radius of curvature of the inner surface of the outer shell 12 becomes sufficiently large, and the result is the adhesion between the outer shell 12 and the valve member 5. It was found that the performance was improved. The radius of curvature of the inner surface of the outer shell 12 is preferably 200 mm or more, more preferably 250 mm or more, or 300 mm or more within a range of 2 mm around the outside air introduction hole 15. This is because, when the radius of curvature is such a value, the inner surface of the outer shell 12 becomes substantially flat, and the adhesion between the outer shell 12 and the valve member 5 is good.

  As shown in FIG. 1B, the bottom surface 29 of the accommodating portion 7 is provided with a central concave region 29 a and a peripheral region 29 b provided around the central concave region 29 a, and the central concave region 29 a has a bottom protruding from the bottom surface 29. A seal protrusion 27 is provided. As shown in FIGS. 6A to 6B, the bottom seal protrusion 27 is a seal portion of the laminated parison in blow molding using a cylindrical laminated parison including the outer layer 11 and the inner layer 13. The bottom seal protrusion 27 includes a base portion 27d, a thin portion 27a, and a thick portion 27b having a thickness larger than that of the thin portion 27a in this order from the bottom surface 29 side.

  Immediately after blow molding, the bottom seal protrusion 27 is in a state of standing substantially perpendicular to the surface P defined by the peripheral region 29b, as shown in FIG. When an impact is applied to the container, the inner layers 13 in the welded portion 27c are easily separated from each other, and the impact resistance is insufficient. Therefore, in this embodiment, the thin-walled portion 27a is softened by blowing hot air to the bottom seal protruding portion 27 after blow molding, and the bottom seal protruding portion 27 is bent at the thin-walled portion 27a as shown in FIG. Yes. Thus, the impact resistance of the bottom seal protrusion 27 is improved by a simple process of simply bending the bottom seal protrusion 27. Further, as shown in FIG. 6B, the bottom seal protrusion 27 does not protrude from the surface P defined by the peripheral region 29b in a bent state. Thus, when the delamination container 1 is erected, the bottom seal protrusion 27 protrudes from the surface P, and the delamination container 1 is prevented from falling over.

  The base portion 27d is provided on the bottom surface 29 side of the thin portion 27a and is thicker than the thin portion 27a. The base portion 27d may be omitted, but the thin portion 27a is provided on the base portion 27d. By providing, the impact resistance of the bottom seal protrusion 27 can be further improved.

  Further, as shown in FIG. 1B, the concave region of the bottom surface 29 is provided so as to cross the entire bottom surface 29 in the longitudinal direction of the bottom seal protrusion 27. That is, the central concave region 29a and the peripheral concave region 29c are connected. With such a configuration, the bottom seal protrusion 27 is 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 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 polypropylene layers may be employed. 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.

  In this embodiment, the outer layer 11 includes a random copolymer layer made of a random copolymer between propylene and another monomer. The outer layer 11 may be a single layer of a random copolymer layer or may have a multiple layer configuration. For example, the structure which pinched | interposed the both sides of the repro layer with the random copolymer layer may be sufficient. By configuring the outer layer 11 with a random copolymer having a specific configuration, the shape restoring property, transparency, and heat resistance of the outer shell 12 can be improved.

  The random copolymer has a content of monomers other than propylene of less 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. The monomer copolymerized with propylene may be any monomer that improves the impact resistance of the random copolymer when compared with a polypropylene homopolymer, and ethylene is particularly preferable. 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 weight average molecular weight of the random copolymer is preferably from 100,000 to 500,000, more preferably from 100,000 to 300,000. Specifically, the weight average molecular weight is, for example, 10, 15, 20, 25, 30, 35, 40, 45, 500,000, and is within a range between any two of the numerical values exemplified here. Also good.

The tensile modulus of the random copolymer is preferably 400 to 1600 MPa, and preferably 1000 to 1600 MPa. This is because the shape restoring property is particularly good when the tensile elastic modulus is in such a range. Specifically, the tensile elastic modulus is, for example, 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600 MPa, and between any two of the numerical values exemplified here It may be within the range.
In addition, since the usability | use_condition of a container will worsen if a container is excessively hard, you may comprise the outer layer 11 by mixing a flexible material, such as a linear low density polyethylene, for example in a random copolymer. However, the material to be mixed with the random copolymer is preferably mixed so as to be less than 50% by weight with respect to the whole mixture so as not to significantly inhibit the effective characteristics of the random copolymer. For example, the outer layer 11 can be made of a material in which a random copolymer and linear low-density polyethylene are mixed at a weight ratio of 85:15.

  As shown in FIG. 7, the inner layer 13 is provided between the EVOH layer 13a provided on the outer surface side of the container, the inner surface layer 13b provided on the inner surface side of the container of the EVOH layer 13a, and between the EVOH layer 13a and the inner surface layer 13b. The adhesive layer 13c is provided. By providing the EVOH layer 13a, the gas barrier property and the peelability from the outer layer 11 can be improved.

  The EVOH layer 13a 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 EVOH layer 13a tends to fall, so that ethylene content is small, 25 mol% or more is preferable. The EVOH layer 13a preferably contains an oxygen absorbent. By containing the oxygen absorbent in the EVOH layer 13a, the oxygen barrier property of the EVOH layer 13a can be further improved.

  The melting point of the EVOH resin is preferably higher than the melting point of the random copolymer constituting the outer layer 11. The outside air introduction hole 15 is preferably formed in the outer layer 11 using a heating type punching device, but 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 random copolymer. When forming, the hole is prevented from reaching the inner layer 13. From this point of view, the difference between (the melting point of EVOH) − (the melting point of the random copolymer layer) should be 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.

  The inner surface layer 13b is a layer that comes into contact with the contents of the delamination container 1, and is, for example, a polyolefin such as low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, and a mixture thereof. It is preferably made of low-density polyethylene or linear low-density polyethylene. 50-300 MPa is preferable and, as for the tensile elasticity modulus of resin which comprises the inner surface layer 13b, 70-200 MPa is preferable. This is because the inner surface layer 13b is particularly flexible when the tensile elastic modulus is in such a range. The tensile modulus is specifically, for example, specifically, for example, 50, 100, 150, 200, 250, 300 MPa, and may be within a range between any two of the numerical values exemplified here. .

  The adhesive layer 13c is a layer having a function of adhering the EVOH layer 13a and the inner surface layer 13b. For example, an acid-modified polyolefin having a carboxyl group introduced into the above-described polyolefin (eg, maleic anhydride-modified polyethylene) is added. And ethylene vinyl acetate copolymer (EVA). An example of the adhesive layer 13c is a mixture of low-density polyethylene or linear low-density polyethylene and acid-modified polyethylene.

Next, an example of the manufacturing method of the lamination peeling container 1 of this embodiment is demonstrated.
First, as shown in FIG. 9A, a laminated structure corresponding to the container body 3 to be manufactured (one example is PE layer / adhesive layer / EVOH layer in order from the container inner surface side as shown in FIG. 9A). The laminated parison in a molten state having a / PP layer laminated structure) is extruded, the laminated parison in the molten state is set in a blow mold, and the divided mold is closed.
Next, as shown in FIG. 9B, a blow nozzle is inserted into the opening on the mouth 9 side of the container body 3, and air is blown into the cavity of the split mold while the mold is clamped.

  Next, as shown in FIG. 9C, the split mold is opened and the blow molded product is taken out. The split mold has a cavity shape such that various shapes of the container body 3 such as the valve member mounting recess 7a, the air circulation groove 7b, and the bottom seal protrusion 27 are formed in the blow molded product. Further, the split mold is provided with a pinch-off portion below the bottom seal protrusion 27, and a lower burr is formed at a lower portion of the bottom seal protrusion 27, and is thus removed.

Next, as shown in FIG.9 (d), the taken-out blow molded product is aligned.
Next, as shown in FIG. 9 (e), a hole is made only in the outer layer 11 in the upper cylindrical portion 31 provided on the upper side of the mouth portion 9, and a blower 33 is used between the outer layer 11 and the inner layer 13. By blowing air, the inner layer 13 is preliminarily peeled from the outer layer 11 at a portion (valve member mounting recess 7a) of the accommodating portion 7 where the valve member 5 is mounted. This preliminary peeling facilitates the step of forming the outside air introduction hole 15 and the step of mounting the valve member 5. In addition, you may cover the front end side of the upper cylindrical part 31 with a cover member so that the blown air may not leak from the front end side of the upper cylindrical part 31. In order to make it easy to make a hole only in the outer layer 11, the inner layer 13 may be peeled from the outer layer 11 in the upper cylindrical part 31 by crushing the upper cylindrical part 31 before making the hole. Well, the preliminary peeling may be performed on the entire housing portion 7 or may be performed on a part of the housing portion 7.
Next, as shown in FIG. 9 (f), an outside air introduction hole 15 is formed in the outer shell 12 using a drilling device. The outside air introduction hole 15 is preferably a round hole, but may have another shape.
Next, as shown in FIG. 10A, hot air is applied to the bottom seal protrusion 27 to soften the thin portion 27 a, and the bottom seal protrusion 27 is bent.
Next, as shown in FIG. 10B, the valve member 5 is inserted into the outside air introduction hole 15.
Next, as shown in FIG.10 (c), the upper cylindrical part 31 is cut.
Next, as shown in FIG. 10 (d), the inner bag 14 is inflated by blowing air into the inner bag 14.
Next, as shown in FIG. 10E, the inner bag 14 is filled with contents.
Next, as shown in FIG. 10 (f), the cap 23 is attached to the mouth portion 9.
Next, as shown in FIG. 10G, the housing portion 7 is covered with a shrink film to complete the product.

  The order of the various steps shown here can be changed as appropriate. For example, the hot air bending step may be performed before the outside air introduction hole opening step or before the inner layer preliminary peeling step. Further, the step of cutting the upper cylindrical portion 31 may be performed before the valve member 5 is inserted into the outside air introduction hole 15.

Further, the inner layer preliminary peeling and the outside air introduction hole opening step can be performed by the following method.
First, as shown in FIG. 11A, the air in the inner bag 14 is sucked from the mouth portion 9 to reduce the pressure in the inner bag 14. In that state, a punching device such as a heat pipe or a pipe cutter is slowly pressed against the outer layer 11. This perforating apparatus has a cylindrical cutter, and air inside the cylinder is sucked. In the state where the outer layer 11 is not perforated, air does not enter between the outer layer 11 and the inner layer 13, so that the inner layer 13 is not peeled from the outer layer 11.

  When the cylindrical cutter penetrates the outer layer 11, as shown in FIG. 11B, the cut excision piece is removed through the cylindrical cutter, and the outside air introduction hole 15 is formed. At this moment, air enters between the outer layer 11 and the inner layer 13, and the inner layer 13 is peeled from the outer layer 11.

  Next, as shown in FIG.11 (c), the outside-air introduction hole 15 is expanded using a drilling apparatus. In addition, when forming the external air introduction hole 15 large enough for insertion of the valve member 5 in the steps of FIGS. 11A to 11B, the diameter expansion step of FIG. 11C is not necessary.

Next, the principle of operation when using the manufactured product will be described.
As shown in FIGS. 12A to 12C, the product filled with the contents is tilted and the side surface of the outer shell 12 is grasped and compressed to discharge the contents. At the start of use, since there is substantially no gap between the inner bag 14 and the outer shell 12, the compressive force applied to the outer shell 12 directly becomes the compressive force of the inner bag 14, and the inner bag 14 is compressed. The contents are discharged.

  The cap 23 incorporates a check valve (not shown), and can discharge the contents in the inner bag 14, but cannot take outside air into the inner bag 14. Therefore, when the compressive force applied to the outer shell 12 after discharging the contents is removed, the outer shell 12 tries to return to its original shape by its own restoring force, but the inner bag 14 remains deflated and only the outer shell 12 remains. Will expand. Then, as shown in FIG. 12 (d), the inside of the intermediate space 21 between the inner bag 14 and the outer shell 12 is in a reduced pressure state, and outside air enters the intermediate space 21 through the outside air introduction hole 15 formed in the outer shell 12. be introduced. When the intermediate space 21 is in a reduced pressure state, the lid 5c is not pressed against the outside air introduction hole 15, and thus does not hinder the introduction of outside air. In addition, the locking portion 5b is provided with airway securing means such as a protrusion 5d and a groove so that the locking portion 5b does not hinder the introduction of outside air even when the locking portion 5b is in contact with the outer shell 12.

  Next, as shown in FIG. 12 (e), when the side surface of the outer shell 12 is gripped and compressed again, the lid 5 c closes the outside air introduction hole 15, thereby increasing the pressure in the intermediate space 21. The compressive force applied to the outer shell 12 is transmitted to the inner bag 14 through the intermediate space 21, and the inner bag 14 is compressed by this force and the contents are discharged.

  Next, as shown in FIG. 12 (f), when the compressive force applied to the outer shell 12 after the discharge of the contents is removed, the outer shell 12 introduces outside air into the intermediate space 21 from the outside air introduction hole 15. It is restored to its original shape by its own restoring force.

2. Second Embodiment Next, a delamination container 1 according to a second embodiment of the present invention will be described with reference to FIG. The delamination container 1 of this embodiment has the same layer configuration and function as those of the first embodiment, but the specific shape is different. The laminated peeling container 1 of the present embodiment is different from that of the first embodiment in the configuration in the vicinity of the valve member mounting recess 7a.

  As shown in FIG. 13A, the delamination container 1 of the present embodiment is configured by connecting a mouth portion 9 and a trunk portion 19 with a shoulder portion 17. In the first embodiment, the bent portion 22 is provided in the shoulder portion 17, but in the present embodiment, the bent portion 22 is not provided in the shoulder portion 17 and the boundary 20 between the shoulder portion 17 and the trunk portion 19 is bent. It functions in the same manner as the portion 22 and suppresses the peeling of the inner bag 14 from reaching the mouth portion 9.

  The valve member mounting recess 7a is provided in a body portion 19 formed of a substantially vertical wall. The valve member mounting recess 7a is provided with a flat region FR, and the flat region FR has an inclined surface of about 70 degrees. . The flat region FR is provided with an outside air introduction hole 15, and the width W of the flat region FR around the outside air introduction hole 15 is 3 mm or more as in the first embodiment. The side wall 7c of the valve member mounting recess 7a has a tapered surface that widens toward the outside, so that a mold for forming the valve member mounting recess 7a can be easily removed. Moreover, as shown in FIG.13 (c), the inner bag 14 is easy to peel from the upper edge 7d of the flat area | region FR.

  In the following examples, a delamination container having an outer layer 11 and an inner layer 13 was manufactured by blow molding, and the outside air introduction hole 15 was formed only in the outer layer 11 having a thickness of 0.7 mm using a heating type punching device. Various changes were made to the inner volume of the delamination container, the size of the outside air introduction hole 15, and the width W around the outside air introduction hole 15 of the flat region FR in the valve member mounting recess 7a. 1 to 5 laminated peeling containers were produced. Further, the valve member 5 having the shape shown in FIG. 14 was manufactured by injection molding, and the lid portion 5 c of the valve member 5 was pushed into the intermediate space 21 through the outside air introduction hole 15. After the contents (water) were filled into the obtained delamination container, the side surfaces of the delamination container were pressed to discharge the contents from the delamination container. The ejection performance at the time when 80% of the content of the content was ejected (ejection performance when the content was small) was evaluated. The case where the contents could be discharged without any problem was evaluated as “◯”, and the case where the contents were difficult to be discharged was evaluated as “X”. The results are shown in Table 1.

  As shown in Table 1, sample no. 1 to 3, the discharge performance when the contents are small is low. In 1-5, the discharge performance at the time of a small amount of contents was high. In order to verify the reason why such a result was obtained, when the radius of curvature of the inner surface of the outer shell 12 was measured within a range of 2 mm around the outer air introduction hole 15 for each sample, the results shown in Table 1 were obtained. It was. As shown in Table 1, when the width W of the flat region FR on the outer surface of the outer shell 12 is 3 mm or more, the radius of curvature of the inner surface of the outer shell 12 becomes significantly large, and the inner surface of the outer shell 12 becomes substantially flat. I found out that On the other hand, it was found that when the width W of the flat region FR on the outer surface of the outer shell 12 is less than 3 mm, the inner surface of the outer shell 12 is not flat but curved. And it turned out that the discharge performance at the time of a small amount of content falls because this curved surface does not align with the valve member 5 appropriately, but air leaks from the external air introduction hole 15.

1: Laminated peeling container, 3: Container body, 5: 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, 23: Cap, 27: Bottom seal protrusion

Claims (8)

A container body having an outer shell and an inner bag, and the inner bag being peeled from the outer shell and contracted as the content decreases;
A delamination container comprising a valve member that adjusts the flow of air between an outer space of the container body and an intermediate space between the outer shell and the inner bag,
The container body includes a storage unit that stores the contents, and a mouth portion that discharges the contents from the storage unit,
The outer shell includes an outside air introduction hole that communicates the intermediate space and the outer space in the housing portion,
The valve member includes a shaft portion that is inserted into the outside air introduction hole and is slidable with respect to the outside air introduction hole, and a lid that is provided on the intermediate space side of the shaft portion and has a larger cross-sectional area than the shaft portion. And a locking portion that is provided on the outer space side of the shaft portion and prevents the valve member from entering the intermediate space,
The outer shell is a delamination container including at least one of the following configurations (1) to (2).
(1) The outside air introduction hole is provided on the inclined surface of the outer shell.
(2) A flat region having a width of 3 mm or more around the outside air introduction hole is provided on the outer surface of the outer shell. The delamination container according to claim 1, comprising the configuration (1), wherein the inclined surface has an inclination angle of 45 to 89 degrees. 3. The delamination container according to claim 1, comprising the configuration (2), wherein the inner surface of the outer shell has a radius of curvature of 200 mm or more within a range of 2 mm around the outside air introduction hole. The laminated peeling container according to any one of claims 1 to 3, wherein the lid portion is configured to substantially close the outside air introduction hole when the outer shell is compressed. The delamination container according to any one of claims 1 to 4, wherein the lid portion has a smaller cross-sectional area as it approaches the shaft portion. The delamination container according to any one of claims 1 to 5, wherein a boundary between the lid portion and the shaft portion has an R shape that bulges outward. The delamination according to any one of claims 1 to 6, wherein the locking portion is configured so that air can be introduced into the intermediate space when the outer shell is restored after being compressed. container. The said peeling part is a lamination peeling container as described in any one of Claims 1-7 which has a processus | protrusion or a groove | channel on the said outer shell side.