TW201917065A - Laminated peelable container - Google Patents

Abstract

The present invention addresses the problem of providing a laminated peelable container in which an inner bag does not separate from a bottom part. According to the present invention, there is provided a laminated peelable container that has an outer shell and an inner bag, wherein the inner bag shrinks accompanying a reduction in the contents, the laminated peelable container is provided with an accommodating part that accommodates the contents, and a pinch-off part that is formed on the bottom surface of the accommodating part, and engagement parts for engaging the inner bag with the outer shell are provided on end parts in the longitudinal direction of the pinch-off part.

Description

   Stacked peel container   

The present invention relates to a laminated peeling container.

Conventionally, a laminated peeling container having an outer bag and an inner bag and shrinking the inner bag as the content decreases has been known (for example, Patent Document 1). Such a laminated peeling container is usually manufactured by blow molding using a cylindrical laminated parison.

    [Existing technical literature]         [Patent Literature]    

[Patent Document 1] Japanese Patent No. 3401519

Although a pinch off portion (sealing portion) is provided at the bottom of such a laminated peeling container when one end of the laminated parison is welded, the inner bag may be detached from the bottom in the pinched portion. If the inner bag is detached from the bottom, the shrinkage method of the inner bag cannot be restricted, resulting in blockage of the flow path or pinholes. In the laminated peeling container of Patent Document 1, the welding layers on the pinch portions are adhered to each other via a plurality of biting portions. However, in order to realize such a structure, the mold structure becomes complicated, resulting in production costs Becomes high. Further, in such a configuration, there is a problem that an outside air introduction portion for introducing outside air between the outer case and the inner bag cannot be provided in the pinch-off portion.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a laminated peeling container that does not detach the inner bag from the bottom.

According to the present invention, there is provided a laminated peeling container having a shell and an inner bag, and the inner bag shrinking as the content decreases, wherein the laminated peeling container is provided with a content And a clip portion formed on the bottom surface of the storage portion, and an engaging portion that engages the outer case with the inner bag is provided at an end portion in the longitudinal direction of the clip portion.

The inventors of the present application conducted intensive studies and found that the provision of the thickness storage portion at the end portion in the longitudinal direction of the pinch-off portion can suppress the detachment of the inner bag, and completed the present invention.

Hereinafter, various embodiments of the present invention will be exemplified. The embodiments shown below can be combined with each other.

Preferably, the outer shell includes a convex portion protruding radially inward at the engaging portion, and the inner bag includes a concave portion engaged with the convex portion at the engaging portion.

Preferably, a mouth portion for discharging contents from the storage portion is provided, and the diameter of the mouth portion is larger than 2 / π times the diameter of the bottom surface of the storage portion.

Preferably, the pinch-off portion is provided with an outside air introduction hole that introduces outside air into a space between the outer case and the inner bag.

Preferably, the pinch-off portion includes a protruding portion protruding outward from the container.

In addition, according to the present invention, there is provided a method for manufacturing a laminated peeling container, which is a method for manufacturing a laminated peeling container having an outer bag and an inner bag and shrinking the inner bag as the content decreases. Step, the blow molding step uses a cylindrical laminated parison having an outer layer constituting the outer shell and an inner layer constituting the inner bag, and extruding a die diameter of the laminated parison In the blow molding step, the inner diameter of the portion forming the bottom portion of the inner diameter of the mold for molding the laminated peeling container is equal to or less than 2 / π times the inner diameter of the portion where the bottom portion is formed.

Preferably, the mold is provided with a compression portion near a ridge portion that molds the pinch portion of the laminated peeling container, and the compression portion compresses the laminated parison to close the laminated parison before clamping the mold. Flow inside the container.

Preferably, the width of the compression portion when the mold is closed is less than or equal to twice the wall thickness of the laminated parison.

Preferably, the width of the compression portion when the mold is closed is 1 mm or less.

1‧‧‧Container

2‧‧‧ Outer Container

2a‧‧‧ trunk

2b‧‧‧ bottom

2c‧‧‧ Reduced diameter

2d‧‧‧ support

2e‧‧‧External air flow path

2f‧‧‧External thread

2g‧‧‧Expansion

3‧‧‧Inner Container / Laminated Peel Container

3a‧‧‧ trunk / container body

3b‧‧‧ bottom of container

3c‧‧‧ flange

3d‧‧‧mouth

3e‧‧‧external thread / engagement

3f‧‧‧ above

3g‧‧‧thickness accumulation section

3h‧‧‧ Containment Department

3j‧‧‧Valve component mounting recess

3k‧‧‧air circulation tank

3p‧‧‧ pinch / bottom seal protrusion

3s‧‧‧concave area

3t‧‧‧peripheral area

3u‧‧‧periphery concave area

4‧‧‧ pump

4a‧‧‧Main body

4a1‧‧‧ tube

4a2‧‧‧ cylindrical part

4a3‧‧‧ Upper wall

4a4‧‧‧ Internal thread

4b‧‧‧Piston

4c‧‧‧Nozzle

4d‧‧‧tube

5‧‧‧ retaining ring

5a‧‧‧Outer tube

5b‧‧‧upper wall

5c‧‧‧ opening

5d‧‧‧Inner tube

5e‧‧‧External air flow path

5f‧‧‧Internal thread

6‧‧‧ inner bag

6a‧‧‧Inner bag exposed part

6e‧‧‧concave

7‧‧‧ shell

7a‧‧‧Clamping section

7e‧‧‧ convex

8‧‧‧ Outside air introduction hole

10‧‧‧ trunk clearance

11‧‧‧ bottom gap

12‧‧‧ inner layer

13‧‧‧ Outer

20‧‧‧ Valve parts

30‧‧‧ cone

31‧‧‧ thin-walled section

40‧‧‧blow mould

40A‧‧‧ split mold

41‧‧‧Underside Forming Department

42‧‧‧ protruding molding

42a‧‧‧ cone

42b‧‧‧Thin-wall molding department

42c‧‧‧Spine Ridge

42d‧‧‧Compression Department

50‧‧‧ die

P‧‧‧Laminated parison

S1‧‧‧Intermediate space

S2‧‧‧External space

FIG. 1 is a sectional perspective view of a storage container 1 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the storage container 1 of FIG. 1.

FIG. 3 is a cross-sectional view of the storage container 1 taken along a cross-section perpendicular to the cross-section of FIG. 2.

FIG. 4 is a sectional perspective view of a state where the pump 4 and the fixing ring 5 are removed from FIG. 1.

FIG. 5 is a perspective view of the pump 4.

FIG. 6 is a perspective view of the outer container 2 and the fixing ring 5.

FIG. 7 is a sectional perspective view of the inner container 3.

FIG. 8A is a perspective view of the inner container 3 viewed from the bottom 3b side, and FIG. 8B is an enlarged perspective view near the bottom 3b.

FIG. 9A is an enlarged view of the bottom 3b of the inner container 3 on the cross-sectional view of FIG. 2, and FIG. 9B is an enlarged view of the bottom 3b of the inner container 3 on the cross-sectional view of FIG.

FIG. 10 is a manufacturing step of the laminated peeling container 3 of FIG. 1.

FIG. 11A is a cross-sectional view schematically illustrating a mold 40 used in the manufacturing step of FIG. 10 when the mold 40 is cut in a direction perpendicular to the split surface, and FIG. 11B is a cross-sectional view schematically illustrating a split surface of the split mold 40A.

12a to 12C are schematic views showing a state in which the pair of split molds 40A are slowly closed and the laminated parison P is clamped.

FIG. 13 is a cross-sectional view showing a state where a gap is provided between the inner bag 6 and the outer case 7.

FIG. 14 is a perspective view showing a configuration of a laminated peeling container 3 according to a second embodiment of the present invention.

FIG. 15 is an enlarged cross-sectional view of the mouth portion 3d of the laminated peeling container 3 and the vicinity of the outside air introduction hole 8 of FIG. 14.

FIG. 16a is a perspective view of a region including the bottom 3b of the laminated peeling container 3 of FIG. 1, and FIG. 16B is a bottom view of the laminated peeling container 3 of FIG.

FIG. 17a is a cross-sectional view when an area including the bottom portion 3b of the laminated peeling container 3 of FIG. 14 is cut along the AA section in FIG. 16B, FIG. 17B is an enlarged cross-sectional view of the bottom seal protrusion 3p, and FIG. The area of the bottom part 3b of the laminated peeling container 3 of 14 is a cross-sectional view when cut | disconnected by the BB cross section in FIG. 16B.

FIG. 18A is an enlarged view showing a portion near the container bottom portion 3b shown in the mold 40 used in the manufacturing step of FIG. 10, and FIG. 18B is an enlarged view showing a portion forming the bottom seal protrusion 3p in the mold 40 of FIG. 18A Illustration.

19A to 19D are schematic diagrams showing a state in which a pair of split molds 40A are slowly closed, and a laminated parison is clamped.

Hereinafter, embodiments of the present invention will be described. Various feature items shown in the following embodiments can be combined with each other. In addition, each feature makes the invention independent.

1. First Embodiment

As shown in FIGS. 1 to 9, the storage container 1 according to the first embodiment of the present invention includes an outer container 2, an inner container 3, a pump 4, and a fixing ring 5.

<Outer container 2>

The outer container 2 has a bottomed cylindrical shape, and includes a trunk portion 2a and a bottom portion 2b. The outer surface side of the upper end of the trunk part 2a is provided with the diameter-reduced part 2c which reduced the diameter of the outer surface of the trunk part 2a. The reduced diameter portion 2c is provided with a male screw portion 2f. A support portion 2d that supports the flange portion 3c of the inner container 3 is provided on the inner surface side near the upper end of the trunk portion 2a. The support portion 2d is formed by increasing the inner diameter of the trunk portion 2a near the upper end. That is, the upper side of the support portion 2d is an enlarged diameter portion 2g whose inner diameter is larger than the lower side of the support portion 2d, and the stepped structure is formed on the support portion 2d. The support portion 2d and the enlarged diameter portion 2g are provided with an external air flow path 2e. When the inner container 3 is installed in the outer container 2, external air flow can be passed through the external air flow path 2e. The bottom 2b is flat, and the outer container 2 is self-supporting. The manufacturing method and material of the outer container 2 are not particularly limited, but are preferably a resin molded body formed by, for example, injection molding.

<Content container 3>

The inner container 3 is a laminated peeling container having an outer case 7 and an inner bag 6 and shrinking as the contents decrease. As the contents decrease, the inner bag 6 is peeled from the outer shell 7 so that the inner bag 6 is peeled from the outer shell 7 and shrunk.

The case 7 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, and a mixture thereof.

The inner bag 6 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, it is possible to improve gas barrier properties and peelability from the case 7. The adhesive layer may be omitted.

The EVOH layer is a layer composed of an ethylene-vinyl alcohol copolymer (EVOH) resin, and can be obtained by hydrolyzing ethylene and vinyl acetate copolymers. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, and from the viewpoint of oxygen barrier properties, it is preferably 32 mol% or less. The lower limit of the ethylene content is not particularly limited, but the smaller the ethylene content, the easier it is to reduce the flexibility of the EVOH layer, so it is preferably 25 mol% or more.

The inner surface layer is a layer that is in contact with the contents, and is composed of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, cycloolefin polymer, EVOH, and mixtures thereof. Is preferably composed of EVOH. Forming a layer in contact with the content by EVOH can improve the barrier properties.

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

The inner container 3 has a bottomed cylindrical shape, and as shown in FIG. 7, the inner container 3 includes a receiving portion 3 h having a trunk portion 3 a, a bottom portion 3 b, and a flange portion 3 c, and a mouth portion 3 d for discharging contents from the receiving portion 3 h. The outer surface of the mouth portion 3d is provided with a male screw portion 3e. In this embodiment, the inner container 3 is formed by blow-molding a cylindrical laminated parison P (refer to FIG. 12 a and the like). The method of manufacturing the inner container 3 will be described in detail later.

The inner container 3 includes, at the bottom 3b, a pinch portion 3p formed by pinching the lower end of the laminated parison P with a ridge portion 42c (refer to FIG. 12a) of the split mold 40A. At the pinch-off portion 3p, the inner bag 6 has an inner bag exposed portion 6a exposed to the outside. In addition, the inner bag exposed portion 6a is provided between the holding portions 7a of the outer case 7, and an outside air introduction hole 8 is provided between the inner bag exposed portions 6a and the holding portions 7a (see FIGS. 8B and 9A). In addition, in this embodiment, although the inner-bag exposed part 6a and the clamp part 7a do not protrude from the bottom part 3b, you may comprise so that it may protrude from the bottom part 3b. In addition, the inner container 3 is formed immediately after the inner bag exposed portion 6a and the holding portion 7a are attached without the external air introduction hole 8. However, since the inner bag exposed portion 6a and the holding portion 7a are easily peeled off, it is easy to separate the inner bag exposed portion 6a and the holding portion 7a. By applying impact or torsion to peel the inner bag exposed portion 6a and the holding portion 7a, the inner bag exposed portion 6a and the holding portion 7a can be separated to form an outside air introduction hole 8 therebetween. The inner container 3 is provided with an external air introduction hole 8 and external air is introduced between the outer case 7 and the inner bag 6 as the content decreases, so that only the inner bag 6 can be contracted.

In addition, as shown in FIG. 7 and FIG. 9B and the like, in the inner container 3 of the present embodiment, a thickness storage portion serving as an engaging portion of the engaging shell 7 and the inner bag 6 is formed at an end portion in the longitudinal direction of the pinching portion 3 p. 3g. Specifically, as shown in FIG. 9B, at the thickness accumulation portion 3g, the outer case 7 includes a pair of convex portions 7e protruding inward in the radial direction, and the inner bag 6 includes a pair of concave portions 6e engaged with the convex portions 7e. Since the inner container 3 of this embodiment engages the convex portion 7e of the outer case 7 with the concave portion 6e of the inner bag 6 in the thickness accumulation portion 3g, even if the inner bag 6 is contracted as the content decreases, it will not cause the inner bag 6 to shrink. The inner bag 6 is detached from the bottom 3b.

In addition, the width d4 of the pinch-off part 3p of this embodiment is formed smaller than the diameter d1 of the bottom part 3b (bottom surface) (refer FIG. 9B). The ratio of d4 / d1 is, for example, 0.6 to 0.9, and more preferably 0.7 to 0.8. Specifically, they are, for example, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, and 0.80, and may be within a range between any two values exemplified here.

In addition, the ratio d2 / d4 of the diameter d2 of the mouth portion 3d with respect to the width d4 of the pinch-off portion 3p is, for example, 0.40 to 0.64, and specifically, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48. , 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, or within the range between any two values exemplified here.

In addition, the inner container 3 of the present embodiment is formed such that the diameter d2 of the mouth portion 3d is larger than 2 / π times the diameter d1 of the bottom portion 3b (bottom surface) of the receiving portion 3h (see FIG. 7). The ratio of d2 / d1 is, for example, 0.28 to 0.52, and specifically, for example, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, and 0.52 may also be within a range between any two values exemplified here.

The flange portion 3c is provided on the upper end of the trunk portion 3a. The flange portion 3c is provided so as to protrude radially outward from the trunk portion 3a. The outer diameter of the flange portion 3c is almost the same as that of the enlarged diameter portion 2g. When the inner container 3 is inserted into the outer container 2, the lower surface of the flange portion 3c abuts against the support portion 2d, so that the inner container 3 is positioned in the up-down direction of the outer container 2. That is, the flange portion 3 c is supported by the outer container 2. In addition, the outer peripheral surface of the flange portion 3c abuts on the inner peripheral surface of the enlarged diameter portion 2g, so that the inner container 3 is positioned horizontally with respect to the outer container 2. If the flange portion 3c is in close contact with the enlarged diameter portion 2g and the support portion 2d, it is difficult to introduce outside air into the gap between the outer container 2 and the inner container 3. However, in this embodiment, it can flow through the outer air flow path 2e ( Refer to Figure 1 and Figure 6) for outside air. The flange portion 3c is hollow, and the contents may be accommodated in the flange portion 3c.

A trunk part gap 10 is provided between the trunk part 3 a of the inner container 3 and the trunk part 2 a of the outer container 2. It is possible to further improve the heat insulation property through this gap. If the thickness of the case 7 is Ts and the thickness of the trunk gap 10 is Tg, Tg / Ts ≧ 0.3, and more preferably Tg / Ts ≧ 0.5. In this case, it is not necessary to thicken the case 7, and the heat insulation property can be significantly improved. Tg / Ts is, for example, 0.3 to 5, specifically, for example, 0.3, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, and 5, and the range between any two values exemplified here may also be used. Inside.

A bottom gap 11 is provided between the bottom 3b of the inner container 3 and the bottom 2b of the outer container 2. In addition, a gap is provided between the front ends of the inner bag exposed portion 6a and the holding portion 7a and the bottom portion 2b of the outer container 2. When the inner bag 6 contracts as the contents are discharged, outside air is introduced between the inner bag 6 and the outer case 7 through the outside air introduction hole 8. As a result, only the inner bag 6 is contracted, the outer shell 7 retains its original shape, and a gap is formed between the inner bag 6 and the outer shell 7. The heat insulation of the storage container is improved through this gap, and the deterioration of the contents is further suppressed.

<Pump 4>

As shown in FIG. 5, the pump 4 is configured to discharge the contents from the inner container 3 without introducing outside air into the inner container 3. The pump 4 includes a main body portion 4a, a piston portion 4b, a nozzle 4c, and a tube 4d. The main body portion 4a includes a cylindrical portion 4a1, a cylindrical portion 4a2, and an upper wall portion 4a3. The inner surface of the cylindrical portion 4a1 is provided with an internally threaded portion 4a4 that is screwed to the externally threaded portion 3e. The cylindrical portion 4a2 is inserted into the mouth portion 3d. The outer diameter of the cylindrical portion 4a2d almost matches the inner diameter of the mouth portion 3d. The cylindrical portion 4a2 is cylindrical, and the piston portion 4b is configured to be slidable within the cylindrical portion 4a2. The internal space of the cylindrical portion 4a2 communicates with the nozzle 4c and the tube 4d. A pump mechanism composed of an elastic member and a valve is built into the internal space of the cylindrical portion 4a2. By operating the pump mechanism through the sliding piston portion 4b, the content sucked up by the tube 4d can be discharged from the nozzle 4c.

<Fixed ring 5>

As shown in FIG. 6, the fixing ring 5 includes an outer cylindrical portion 5 a, an upper wall portion 5 b, and an inner cylindrical portion 5 d. The outer tube portion 5a and the inner tube portion 5d are connected by an upper wall portion 5b. The inner surface of the outer cylindrical portion 5a is provided with an internally threaded portion 5f that can be screwed into the externally threaded portion 2f. The upper wall portion 5b is provided with an opening portion 5c. The inner diameter of the opening portion 5c is larger than the outer diameter of the cylindrical portion 4a2. Therefore, as shown in FIG. 1, in a state where the pump 4 is mounted on the mouth portion 3 d and the fixing ring 5 is mounted on the outer container 2, there occurs between the outer surface of the cylindrical portion 4 a 1 of the pump 4 and the inner surface of the opening portion 5 c. Gap to allow ventilation. In addition, if the fixing ring 5 is attached to the outer container 2 with the inner container 3 inserted into the outer container 2, the front end of the inner tube portion 5 d abuts the upper surface 3 f of the inner container 3, and the inner container 3 is in the vertical direction. Fully fixed on. In addition, since the inner container 3 is unevenly fitted to the outer container 2 on the flange portion 3c of the inner container 3, the inner container 3 can be fixed to the outer container 2 even if the fixing ring 5 is not provided. If the inner tube portion 5d is in close contact with the upper surface 3f, it is difficult for outside air to be introduced into the gap between the outer container 2 and the inner container 3. However, in the present embodiment, the inner tube portion 5d is provided with an outer air flow path 5e and can pass through. The outside air of the outside air flow path 5e.

In the structure of this embodiment, outside air is introduced into the gap between the inner bag 6 and the outer case 7 through the openings 5c, the outside air flow paths 5e, 2e, the trunk gap 10, the bottom gap 11, and the outside air introduction hole 8. . Therefore, even when the storage container 1 is suddenly exposed in a high-temperature environment, it is difficult to bring high-temperature outside air into contact with the inner bag 6.

<Manufacturing method of the inner container 3>

Next, a method for manufacturing the inner container 3 (layered peeling container) according to this embodiment will be described.

First, as shown in FIG. 10I, a laminated structure corresponding to the inner container 3 to be manufactured is provided (an example is as shown in FIG. 10I, from the inner surface side of the container in order from the PE layer / adhesive layer / EVOH The laminated structure P of the molten inner layer 12 and the outer layer 13 of the PP layer is extruded from a die 50 (die), and the laminated parison in the molten state is attached to a blow molding. In the mold 40 (refer to FIGS. 11A and 11B), the pair of split molds 40A is closed. The split mold 40A has various shapes of the inner container 3 such as a trunk portion 3a, a bottom portion 3b, and a flange portion 3c and is formed into a cavity shape of a blow-molded product.

Here, the forming of the shape near the bottom portion 3b of the inner container 3 using the blow molding die 40 will be described in detail with reference to FIGS. 11A, 11B, and 12A to 12C. First, Fig. 11A is a cross-sectional view schematically showing a case where the mold 40 used in the manufacturing step of Fig. 10 is cut in a direction perpendicular to the dividing plane. As shown in FIG. 11A, the split molds 40A of the blow molding mold 40 each include a ridge portion 42 c. A compression portion 42d for compressing the laminated parison P at the time of mold clamping is provided below the ridge portion 42c. Here, the width d3 at the time of clamping the compression portion 42d is twice or less the wall thickness d6 (see FIG. 12a) of the laminated parison P. The ratio of d3 / d6 is, for example, 0.3 to 2, and more preferably 0.5 to 1. Specifically, the ratio of d3 / d6 is, for example, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, and may be within a range between any two values exemplified here.

12A to 12C show a state in which the pair of split molds 40A are slowly closed, and the laminated parison is clamped. If the split mold 40A is closed from the state before the mold clamping in FIG. 12a, the cylindrical laminated parison P is squeezed inwardly through the ridge portion 42c of the split mold 40A, as shown in FIG. 12b. The inner layers 12 of the laminated parison P are in contact with each other. When the split mold 40A is further closed from this state, the laminated parison is compressed via the ridge portion 42c and the compression portion 42d. In addition, as shown in FIG. 12C, the laminated parison P is divided into two via the ridge portion 42c with the mold completely closed, and a pinch-off portion 3p is formed on the container side.

As shown in FIGS. 12B to 12C, when the split mold 40A is closed, the laminated parison P having the outer layer 13 and the inner layer 12 is gradually compressed, but in this embodiment, since the mold 40 has a compression portion 42d, In the laminated parison P, the lower part (outside of the container) of the ridge portion 42c is compressed more than the upper part (inside of the container). Accordingly, the extruded laminated parison P becomes easy to flow in the container inner direction (refer to the arrow of FIG. 12B).

Further, in the present embodiment, the diameter of the die 50, as shown in FIGS. 11A and 11B, that is, the diameter d5 of the laminated parison P extruded from the die 50 is set to be slightly smaller than that formed in the inner diameter of the die 40. The inner diameter d2 of the portion of the mouth portion 3d of the inner container 3. The ratio of d5 / d2 is, for example, 0.6 to 0.9, and more preferably 0.7 to 0.8. The ratio of d5 / d2 is, for example, specifically 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, or 0.80, and may be within a range between any two values exemplified here. Here, if the diameter d5 of the laminated parison P is excessively larger than the inner diameter d2 of the portion where the mouth portion 3d is formed, burrs may occur during mold clamping, or if the diameter d5 of the laminated parison P is too small, Molding becomes difficult, but the mouth portion 3d can be appropriately molded by setting the ratio d5 / d2 to the above-mentioned value.

In order to form the above-mentioned thickness accumulation portion 3g, as shown in FIG. 11B, even if the laminated parison P is cylindrically pressed by the mold clamping, it is preferable to be the folded diameter of the width of the laminated parison P to be extruded. d7 (in the present embodiment, this width is almost the same as the width d4 of the clipped portion 3p after molding) is smaller than the inner diameter d1 of the portion forming the bottom portion 3b of the inner container 3 (d7 <d1). Thereby, since the laminated parison P to be squeezed can flow radially outward inside the container, it is easy to form the thickness storage portion 3g. Here, the folded diameter d7 is larger than π / 2 times (d5 × π / 2 <d7) of the diameter d5 of the laminated parison P. Therefore, in order to satisfy the above-mentioned conditions, in the present embodiment, the diameter d5 (the diameter of the die 50) of the laminated parison P is set to be 2 / π times or less the inner diameter d1 of the portion forming the bottom portion 3b. The ratio of d5 / d1 is, for example, 0.1 to 0.63, and more preferably 0.19 to 0.42. Specifically, the ratio of d5 / d1 is, for example, 0.19, 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, and 0.42 may also be within a range between any two values exemplified here.

As described above, after closing the pair of split molds 40A, as shown in II of FIG. 10, the blow nozzle is inserted into the opening portion on the side of the mouth portion 3d of the inner container 3, and the split mold Air is blown into the cavity. Next, as shown in III in Fig. 10, the split mold is opened, and the blow-molded product is taken out. At this time, since a lower burr is formed in a portion below the pinch-off portion 3p, the burr is removed.

In addition, for the molded article molded as described above, a known inner layer preliminary peeling step, the above-mentioned forming step of the outside air introduction hole 8 and the like are performed to complete the inner container 3.

<Manufacturing method and use method of the storage container 1>

After filling the contents in the inner container 3, the pump 4 is mounted in the outer container 2 of the mouth portion 3d, and the fixing ring 5 is mounted on the outer container 2 in this state to manufacture the storage container 1 of the present embodiment.

As shown in FIG. 2, the contents can be completely filled without a gap between the inner bag 6 and the outer shell 7, but as shown in FIG. 13, it can also be filled with a gap provided between the inner bag 6 and the outer shell 7. Filled (ie, partially filled). At this time, after filling the contents, there is a gap between the inner bag 6 and the outer case 7 even before the user starts discharging the contents, thereby further improving the heat insulation property. When the volume of the outer case 7 is Vs and the volume of the contents contained in the inner bag 6 is Vc, Vc / Vs ≦ 0.95 is preferred, and Vc / Vs ≦ 0.9 is more preferred. Vc / Vs is, for example, 0.5 to 0.95, and specifically, for example, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, and 0.95, and may be within a range between any two values exemplified here.

As a method of partially filling the contents, for example, the inner bag 6 is detached from the outer shell 7 while the inner bag 6 is peeled from the outer shell 7 by sucking the air in the inner bag 6 from the mouth portion 3d, and then the contents are partially filled. Methods. According to such a method, a gap can be provided between the inner bag 6 and the outer case 7, and the inner bag 6 can be partially filled so that no air remains in the inner bag 6.

2. Second Embodiment

Next, a laminated peeling container 3 according to a second embodiment of the present invention will be described with reference to FIGS. 14 to 18. The container according to the second embodiment is a squeeze bottle, and does not have the same components as the outer container 2 according to the first embodiment. The laminated peeling container 3 according to the second embodiment is different from the inner container 3 according to the first embodiment in the point including the valve member 20 and the point at which the pinch-off portion 3p has the bottom seal protruding portion 3p. The following description focuses on different points.

As shown in FIG. 14, the laminated peeling container 3 according to the present embodiment includes a container body 3 a and a valve member 20. The container main body 3a includes a storage portion 3h that stores the content, and a mouth portion 3d that discharges the content from the storage portion 3h.

As shown in FIG. 15, the container body 3 a includes an outer layer 13 and an inner layer 12 in the storage portion 3 h and the mouth portion 3 d. The outer layer 13 constitutes the outer shell 7 and the inner layer 12 constitutes the inner bag 6. As the content decreases, the inner layer 12 is peeled from the outer layer 13, so that the inner bag 6 is peeled from the outer shell 7 and shrunk.

The mouth portion 3d is provided with an engagement portion 3e capable of engaging with a cover (not shown) with a check valve. The cover can be installed in a gland type or in a screw type.

As shown in FIG. 15, the valve member 20 is inserted into the outside air introduction hole 8 formed in the receiving portion 3 h to adjust the air between the intermediate space S1 between the outer case 7 and the inner bag 6 and the outer space S2 of the container body 3 a. In and out. As the structure of the valve member 20, for example, the gap between the edge of the outside air introduction hole 8 and the valve member 20 can be opened and closed through the movement of the valve member 20, so that the valve member 20 can be opened and closed to the outside air introduction hole 8. A structure, or a structure in which a through-hole and an openable valve are provided in the valve member 20 itself, and the through-hole is opened and closed by the movement of the valve to open and close the external air introduction hole 8. In addition, it is also possible to adopt a structure in which the inlet and outlet of air are adjusted by attaching a filter to the outside air introduction hole 8 without providing the valve member 20, or the outside air introduction hole 8 may be closed by a finger or the like only when the contents are discharged. To adjust the structure. Further, a cover of a check valve provided with the outside air introduction hole 8 in the mouth portion 3d may be used.

The valve member 20 is configured to close the outside air introduction hole 8 to compress the inner bag 6 when the case 7 is compressed, and to introduce the inside space S1 when the compression force to the case 7 is released. Outside air.

The accommodating portion 3h is covered with a shrink film after the valve member 20 is attached. At this time, the valve member 20 is mounted on the valve member mounting recess 3j provided in the storage portion 3h so that the valve member 20 is not interfered by the shrink film. In addition, an air circulation groove 3k (refer to FIG. 1) extending from the valve member mounting recess 3j in the direction of the mouth portion 3d is provided so that the valve member mounting recess 3j is not sealed by the shrink film.

Next, a region near the bottom portion 3b of the container body 3a according to the present embodiment will be described with reference to FIGS. 16A, 16B, 17A, and 17B. As shown in FIG. 16a, the bottom portion 3b of the receiving portion 3h is provided with a recessed area 3s and a peripheral area 3t provided around the recessed area 3s. The recessed area 3s is provided with a bottom seal projection 3p protruding from the bottom surface. In the present embodiment, the bottom seal protrusion 3 p corresponds to a pinch portion of the laminated parison in blow molding using the laminated parison. As shown in an enlarged cross-sectional view of FIG. 17B, the bottom seal protruding portion 3 p includes a tapered portion 30 and a thin-walled portion 31 having a thickness smaller than that of the tapered portion. The tapered portion 30 has a shape that is tapered from the bottom to the front end. The thin-walled portion 31 is formed at a front end position of the tapered portion 30. As shown in FIG. 16A, these tapered portions 30 and thin-walled portions 31 are formed so as to cross the entire bottom portion 3b along the long-side direction (left-right direction in FIG. 16B) of the bottom seal protruding portion 3p. Therefore, a part of the peripheral region 3t is concave, and in this part, the central concave region 3s is connected to the peripheral concave region 3u. These recessed areas 3 s of the central recessed area 3 s form a recessed portion in the claim. The cross-sectional shape of the thin-walled portion 31 is a rectangle having a long side in a direction perpendicular to the bottom surface. Therefore, in this embodiment, as shown in FIG. 17A, the bottom portion 3b is formed such that the central portion thereof is a convex bottom, and the bottom seal projection 3p does not protrude from the ground plane F (refer to FIG. 17a) defined by the peripheral region 3t. The front end of the thin-walled portion 31 is located above the ground plane F.

It should be noted that the container main body 3a of this embodiment is different from the first embodiment in that the outer shell 7 and the inner bag 6 are sealed at the bottom sealing protrusion 3p, and no outside air introduction hole is formed at the bottom 3b (refer to FIGS. 17A to 17C). . Here, "sealing" means that the cylindrical laminated parison is welded and the bottom is closed. In addition, in this embodiment, the ratio of the inner layer 12 to the outer layer 13 on the bottom seal protrusion 3p is smaller than the ratio of the inner layer 12 in other parts such as the other part of the bottom part 3b or the side surface of the container body 3a. Therefore, especially at the front end portion of the bottom seal protrusion 3p, as shown in FIG. 17B, the outer layer 13 is welded to at least a part of the area, that is, the left and right outer layers 13 through the seal portion are not interposed through the inner layer 12 Welding. With such a structure, it is possible to improve the impact resistance as compared with a structure in which the entire outer layer 13 of the bottom seal protrusion 3p is welded via the inner layer 12. However, it is not necessary to have a structure in which the inner layer 12 reaches the thin-walled portion 31 without reaching the thin-walled portion 31 as shown in FIG. 17B. For example, the structure in which the inner layer 12 reaches the thin-walled portion 31 from a macro perspective may be used. In addition, the manufacturing method of the blow molding by the structure near the bottom part 3b is demonstrated later.

In this embodiment, the ratio of the thickness t2 (refer to FIG. 17B) of the base end portion of the tapered portion 30 to the wall thickness t1 of the bottom portion 3 b of the container body 3 a is preferably 2.0 or less. The ratio of the thickness t2 of the base end portion of the tapered portion 30 to the wall thickness t1 of the bottom portion 3b is more preferably 0.5 to 1.5, and further preferably 0.8 to 1.2. Specifically, the ratio is, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, and may be within a range between any two values exemplified here. In addition, the "wall thickness t1 of the bottom part 3b" here means the center of the bottom part 3b means the wall thickness of the bottom part 3b except the part near the seal part which is thicker than the peripheral thickness, and is prescribed | regulated from the tapered part 30, for example. The base end portion has a thickness of the bottom portion 3b at a position X having the same length as the length in the vertical direction of the bottom portion 3b of the bottom seal protruding portion 3p (see FIG. 17B). The ratio of the thickness t3 of the thin-walled portion 31 to the thickness t2 of the base end portion of the tapered portion 30 is preferably 0.01 to 0.1, and more preferably 0.03 to 0.07. Specifically, this ratio is, for example, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, and may be within a range between any two values exemplified here. The ratio of the length t5 in the same direction of the thin-walled portion 31 to the length t4 in the vertical direction of the bottom portion 3b of the tapered portion 30 is preferably 0.05 to 0.3, more preferably 0.1 to 0.25, and still more preferably 0.15 to 0.20. Specifically, this ratio is, for example, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, or any two values exemplified here. Within range.

In addition, as shown in FIG. 17A, FIG. 17C, etc., the container main body 3a of this embodiment is also formed with the engagement part which engages the outer case 7 and the inner bag 6 in the longitudinal direction end part of the bottom seal protrusion 3p. The thickness accumulation part 3g. Specifically, as shown in FIG. 17C, at the thickness storage portion 3g, the outer case 7 includes a pair of convex portions 7e protruding inward in the radial direction, and the inner bag 6 includes a pair of concave portions 6e engaged with the convex portions 7e. In this way, in the inner container 3 of the present embodiment, the convex portion 7e of the outer case 7 and the concave portion 6e of the inner bag 6 are engaged with the thickness accumulation portion 3g. Even if the inner bag 6 shrinks as the content decreases, the inner bag 6 does not move from the inner bag 6 The bottom 3b is detached.

The ratio of the diameter d1 of the bottom portion 3b (bottom surface) of this embodiment, the diameter d2 of the mouth portion 3d, and the width d4 of the bottom seal projection 3p (corresponding to the pinch portion 3p of the first embodiment) is the same as that of the first embodiment. Way the same range.

The manufacturing method of the laminated peeling container 3 of this embodiment is similar to the manufacturing method of the inner container 3 of the first embodiment, but the shape of the mold 40 forming the bottom 3b (bottom seal projection 3p) of the laminated peeling container 3 is different. Hereinafter, the molding of the shape in the vicinity of the bottom portion 3b of the container body 3a by the blow molding die 40 will be described in detail with reference to FIGS. 18A, 18B, and 19A to 19D. These points will be explained. In this embodiment, various shapes of the container main body 3a such as the valve member mounting recess 3j, the air flow groove 3k, and the bottom seal protrusion 3p are formed as the cavity shape of the blow-molded product in the split mold 40A.

First, FIG. 18A is an enlarged view showing a portion near the bottom portion 3 b of the molding container of the blow molding die 40. As shown in FIG. 18A, the split mold 40A includes a bottom surface molding portion 41 that molds the bottom portion 3b, and a projection molding portion 42 that molds the bottom seal projection 3p. More specifically, as shown in the enlarged view of FIG. 18B, the protruding molding portion 42 includes a tapered surface 42a that is formed by molding the tapered portion 30 of the bottom seal protruding portion 3p, and is inclined toward the inside of the container, and molding the thin-walled portion 31 The thin-walled molded portion 42b and the ridge portion 42c.

19A to 19D show a state in which the pair of split molds 40A are gradually closed and the laminated parison P is clamped. If the split mold 40A is closed from the state before the mold clamping shown in FIG. 19A, the cylindrical laminated parison P is pressed inwardly through the thin-walled molding portion 42b and the ridge portion 42c of the split mold 40A. As shown in FIG. 19B, first, the inner layers 12 of the laminated parison P are in contact with each other. As shown in FIG. 19C, when the split mold 40A is further closed from this state, the laminated parison P is compressed through the thin-walled molding portion 42b and the ridge portion 42c, and even the tapered surface 42a. In addition, as shown in FIG. 19D, by fully closing the mold, the tapered portion 30 and the thin-walled portion 31 are formed, and the laminated parison P is divided into two by the ridge portion 42c.

In addition, in this embodiment, the diameter d5 of the laminated parison P is also set to be slightly smaller than the inner diameter d2 of the portion where the mouth portion 3d of the inner container 3 is formed in the inner diameter of the mold 40, and this ratio is equal to The first embodiment has the same range.

As shown in FIGS. 19B to 19D, when the split mold 40A is closed, the laminated parison P having the outer layer 13 and the inner layer 12 is gradually compressed, but in this embodiment, the split mold 40A is provided to face the container. The tapered surface 42a inclined in the inner direction causes the laminated parison P to be pressed toward the inner direction of the container (upward direction in FIGS. 19A to 19D). That is, in this embodiment, the tapered surface 42a and the thin-walled molding portion 42b of the protruding molding portion 42 correspond to the compression portion 42d (refer to FIG. 18B) that compresses the laminated parison P during mold clamping. In the present embodiment, the thickness storage portion 3g is configured to be easily formed through the compression portion 42d provided above the ridge portion 42c (the inside of the container). In addition, the inner layer 12 located inside the laminated parison P is configured to be easily moved toward the inside of the container having a large space (refer to the arrows in FIGS. 19C and 19D), and the bottom seal protrusion 3p (the tapered portion 30) after the mold is closed. And the thin-walled portion 31), the proportion occupied by the inner layer 12 with respect to the outer layer 13 is smaller than the case where the split mold 40A does not have the tapered surface 42a. As a result, in the bottom seal protrusion 3p, in at least a part of the area, the outer layers 13 are compressed and welded to each other. Compared with the structure in which the inner layer 12 reaches the front end and the inner layers 12 are welded to each other, the impact resistance is improved, even if an impact is applied. It is also possible to manufacture a laminated peeling container 3 in which the bottom seal protrusion 3p is not separated. In addition, it is experimentally confirmed that the movement of the inner layer 12 toward the inside of the container can also be promoted by providing the thin-walled portion 31.

In addition, in this embodiment, it is preferable to set the folding diameter d7 (the width of the laminated parison P to be extruded) to be equal to or smaller than the width d4 of the bottom seal projection 3p. The ratio of d4 / d7 is, for example, 0.8 to 1.0, and specifically, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, and 1.00 can also be in the range between any two values exemplified here. By setting d4 / d7 as described above, the thickness accumulation portion 3g can be appropriately formed.

In addition, this invention can be implemented as follows.

‧ In the above-described embodiment, the bottom seal protrusion 3 p is composed of the tapered portion 30 and the thin-walled portion 31, but the thin-walled portion 31 is not necessary. Even when the thin-walled portion 31 is not provided, the bottom seal protrusion 3p is formed into a tapered shape, so that the outer layers 13 are welded to each other during mold clamping, and impact resistance can be improved. .

Claims (9)

    A laminated peeling container having an outer shell and an inner bag that shrinks as the content decreases, wherein the laminated peeling container includes a receiving portion for storing the content and a pinch formed on a bottom surface of the receiving portion. A portion is provided at an end portion in the longitudinal direction of the pinch-off portion with an engaging portion for engaging the outer shell with the inner bag.         The laminated peeling container according to claim 1, wherein the outer casing includes a convex portion protruding radially inward at the engaging portion, and the inner bag includes an engaging portion engaged with the convex portion at the engaging portion. Recess.         The laminated peeling container according to claim 1, further comprising a mouth portion for discharging the contents from the storage portion, the diameter of the mouth portion being larger than 2 / π times the diameter of the bottom surface of the storage portion.         The laminated peeling container according to any one of claims 1 to 3, wherein the pinch-off portion is provided with an outside air introduction hole that introduces outside air into a space between the outer case and the inner bag.         The laminated peeling container according to any one of claims 1 to 3, wherein the pinch-off portion includes a protruding portion protruding outward from the container.         A method for manufacturing a laminated peeling container, which is a method for manufacturing a laminated peeling container having an outer shell and an inner bag and shrinking the inner bag as the content decreases. The manufacturing method includes a blow molding step using a cylindrical shape. A laminated parison comprising an outer layer constituting the outer shell and an inner layer constituting the inner bag, wherein a diameter of a die for extruding the laminated parison is in the blow molding step Of the inner diameter of the mold for forming the laminated peeling container, the inner diameter of the portion forming the bottom portion is 2 / π times or less.         The method for manufacturing a laminated peeling container according to claim 6, wherein the mold is provided with a compression portion near a ridge portion forming a pinch portion of the laminated peeling container, and the compression portion is compressed before the mold is closed. The laminated parison flows the laminated parison toward the inside of the container.         The method of manufacturing a laminated peeling container according to claim 7, wherein the width of the compressed portion when the mold is closed is twice or less the wall thickness of the laminated parison.         The method for manufacturing a laminated peeling container according to claim 7, wherein the width of the compression portion when the mold is closed is 1 mm or less.