JP6923788B2 - Laminate peeling container - Google Patents

Description

The present invention relates to a laminated stripping container.

Conventionally, there is known a laminated peeling container having an outer shell and an inner bag and shrinking the inner bag as the contents decrease (for example, Patent Document 1). Such a laminated stripping container is generally manufactured by blow molding using a cylindrical laminated parison.

Patent No. 3401519

The bottom of such a laminated peeling container is provided with a pinch-off portion (seal portion) when one end of the laminated parison is welded, and the inner bag may be detached from the bottom portion at this pinch-off portion. If the inner bag is detached from the bottom, the way the inner bag contracts cannot be regulated, and the flow path may be blocked or pinholes may occur. In the laminated peeling container of Patent Document 1, the welded layers in the pinch-off portion are adhered to each other by a plurality of biting portions, but in order to realize such a configuration, the mold structure becomes complicated. , Leads to an increase in production costs. Further, in such a configuration, there is also a problem that the pinch-off portion cannot be provided with an outside air introduction portion for introducing outside air between the outer shell and the inner bag.

The present invention has been made in view of such circumstances, and provides a laminated peeling container in which the inner bag does not come off from the bottom.

According to the present invention, it is a laminated peeling container having an outer shell and an inner bag and the inner bag shrinks as the contents decrease, and a container for accommodating the contents and a bottom surface of the container. Provided is a laminated peeling container provided with a pinch-off portion formed in, and an engaging portion in which an outer shell and an inner bag engage with each other at an end portion in the longitudinal direction of the pinch-off portion.

As a result of diligent studies, the present inventor has found that the detachment of the inner bag can be suppressed by providing a meat pool at the end of the pinch-off portion in the longitudinal direction, and has reached the completion of the present invention.

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

Preferably, the outer shell comprises a convex portion that projects radially inward at the engaging portion, and the inner bag comprises a concave portion that engages with the convex portion at the engaging portion.

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

Preferably, the pinch-off portion is provided with an outside air introduction hole for introducing outside air into the space between the outer shell and the inner bag.

Preferably, the pinch-off portion comprises a protrusion that projects out of the container.

Further, according to the present invention, there is a method for manufacturing a laminated peeling container having an outer shell and an inner bag and the inner bag shrinks as the contents decrease, wherein the outer layer constituting the outer shell and the said. A blow molding step using a cylindrical laminated parison having an inner layer constituting an inner bag is provided, and the die diameter for extruding the laminated parison is the inner diameter of a mold for molding the laminated peeling container in the blow molding step. Provided is a method for manufacturing a laminated stripping container, which is 2 / π times or less the inner diameter of the portion forming the bottom.

Preferably, the mold is provided with a compression portion in the vicinity of a cut-off portion for forming a pinch-off portion of the laminated peeling container, in which the laminated parison is compressed and the laminated parison is allowed to flow inward of the container before molding.

Preferably, the width of the compression portion at the time of molding is twice or less the wall thickness of the laminated parison.

Preferably, the compression portion has a width of 1 mm or less at the time of mold clamping.

It is sectional drawing of the storage container 1 of one Embodiment of this invention. It is sectional drawing of the storage container 1 of FIG. It is sectional drawing which cut | cut the containing container 1 by the cross section perpendicular to the cross section of FIG. FIG. 5 is a cross-sectional perspective view of a state in which the pump 4 and the fixing ring 5 are removed from FIG. It is a perspective view of a pump 4. It is a perspective view of the outer container 2 and the fixing ring 5. It is sectional drawing of the inner container 3. FIG. FIG. 8A is a perspective view of the inner container 3 as viewed from the bottom portion 3b side, and FIG. 8B is an enlarged perspective view of the vicinity of the bottom portion 3b. 9A is an enlarged view of the bottom 3b of the inner container 3 in the cross-sectional view of FIG. 2, and FIG. 9B is an enlarged view of the bottom 3b of the inner container 3 in the cross-sectional view of FIG. The manufacturing process of the laminated peeling container 3 of FIG. 1 is shown. FIG. 11A is a schematic end view when the mold 40 used in the manufacturing process of FIG. 10 is cut in a direction perpendicular to the division surface, and FIG. 11B schematically shows the division surface of the division mold 40A. It is an end view. 12A to 12C are explanatory views showing a state in which the pair of split dies 40A are gradually closed and the laminated parison P is molded. It is sectional drawing which shows the state which the gap is provided between the inner bag 6 and the outer shell 7. It is a perspective view which shows the structure of the laminated peeling container 3 of the 2nd Embodiment of this invention. It is an enlarged cross-sectional view of the mouth portion 3d of the laminated peeling container 3 of FIG. 14 and the vicinity of the outside air introduction hole 8. 16A is a perspective view of a region including the bottom portion 3b of the laminated stripping container 3 of FIG. 1, and FIG. 16B is a bottom view of the laminated stripping container 3 of FIG. FIG. 17A is a cross-sectional view when a region including the bottom portion 3b of the laminated peeling container 3 of FIG. 14 is cut along the AA cross section in FIG. 16B, and FIG. 17B is an enlarged cross-sectional view of the bottom seal protruding portion 3p. FIG. 17C is a cross-sectional view of the region including the bottom portion 3b of the laminated peeling container 3 of FIG. 14 when the region including the bottom portion 3b is cut along the BB cross section in FIG. 16B. FIG. 18A is an enlarged view showing a portion of the mold 40 used in the manufacturing process shown in FIG. 10 forming the vicinity of the bottom portion 3b of the container, and FIG. 18B shows the bottom seal protruding portion 3p of the mold 40 of FIG. 18A. It is an enlarged view which shows the part to form. 19A to 19D are explanatory views showing how the pair of split dies 40A are gradually closed and the laminated parison is molded.

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

1. 1. First Embodiment As shown in FIGS. 1 to 9, the storage container 1 of 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 tubular shape and includes a body portion 2a and a bottom portion 2b. On the outer surface side of the upper end of the body portion 2a, a diameter-reduced portion 2c in which the outer surface of the body portion 2a is reduced in diameter is provided. The reduced diameter portion 2c is provided with a male screw portion 2f. A support portion 2d for supporting the flange portion 3c of the inner container 3 is provided on the inner surface side near the upper end of the body portion 2a. The support portion 2d is formed by increasing the inner diameter of the body portion 2a near the upper end. That is, the upper side of the support portion 2d is the enlarged diameter portion 2g having a larger inner diameter of the body portion 2a than the lower side of the support portion 2d, and a step is formed in the support portion 2d. The support portion 2d and the diameter-expanded portion 2g are provided with an outside air flow passage 2e, so that outside air can flow through the outside air flow passage 2e even when the inner container 3 is mounted inside the outer container 2. 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 for example, a resin molded body formed by injection molding is preferable.

<Inner container 3>
The inner container 3 is a laminated peeling container having an outer shell 7 and an inner bag 6 and the inner bag 6 shrinks as the contents decrease. As the contents decrease, the inner bag 6 separates from the outer shell 7, so that the inner bag 6 contracts away from the outer shell 7.

The outer shell 7 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 inner bag 6 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the inner surface side of the container of the EVOH layer, and an adhesive layer provided between the EVOH layer and the inner surface layer. By providing the EVOH layer, the gas barrier property and the peelability from the outer shell 7 can be improved. The adhesive layer may be omitted.

The EVOH layer is a layer made of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of an ethylene-vinyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol%, preferably 32 mol% or less from the viewpoint of oxygen barrier properties. The lower limit of the ethylene content is not particularly specified, but 25 mol% or more is preferable because the flexibility of the EVOH layer tends to decrease as the ethylene content decreases.

The inner layer is a layer 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 a mixture thereof. , EVOH is preferable. Barrier properties can be improved by forming a layer in contact with the contents with EVOH.

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

The inner container 3 has a bottomed tubular shape, and as shown in FIG. 7, has a housing portion 3h having a body portion 3a, a bottom portion 3b, and a flange portion 3c, and a mouth portion 3d for discharging contents from the housing portion 3h. Be prepared. A male screw portion 3e is provided on the outer surface of the mouth portion 3d. In the present embodiment, the inner container 3 is formed by blow molding a tubular laminated parison P (see FIG. 12A and the like). The method for manufacturing the inner container 3 will be described later.

The inner container 3 is provided with a pinch-off portion 3p formed by sandwiching the lower end of the laminated parison P between the cut-off portions 42c (see FIG. 12A) of the split die 40A and crushing the bottom portion 3b. In the pinch-off portion 3p, the inner bag 6 has an inner bag exposed portion 6a exposed to the outside. Further, the inner bag exposed portion 6a is sandwiched by the sandwiching portion 7a of the outer shell 7, and an outside air introduction hole 8 is provided between the inner bag exposed portion 6a and the sandwiching portion 7a (FIGS. 8B and 9A). reference). In the present embodiment, the inner bag exposed portion 6a and the sandwiching portion 7a do not protrude from the bottom portion 3b, but may be configured to protrude from the bottom portion 3b. Immediately after the inner container 3 is molded, the inner bag exposed portion 6a and the holding portion 7a are attached to each other and the outside air introduction hole 8 is not provided. However, since the inner bag exposed portion 6a and the holding portion 7a are easily peeled off, the inner bag By applying an impact or a twisting force so that the exposed portion 6a and the holding portion 7a are peeled off, the inner bag exposed portion 6a and the holding portion 7a can be peeled off and an outside air introduction hole 8 can be formed between them. Since the inner container 3 has the outside air introduction hole 8, it is possible to introduce the outside air between the outer shell 7 and the inner bag 6 as the contents decrease, and to contract only the inner bag 6. It has become.

In addition, as shown in FIGS. 7 and 9B, the inner container 3 of the present embodiment has meat as an engaging portion in which the outer shell 7 and the inner bag 6 engage with the longitudinal end of the pinch-off portion 3p. A pool of 3 g is formed. Specifically, as shown in FIG. 9B, in the meat pool 3g, the outer shell 7 has a pair of convex portions 7e protruding inward in the radial direction, and the inner bag 6 has a pair of concave portions 6e that engage with the convex portions 7e. It has. In the inner container 3 of the present embodiment, since the convex portion 7e of the outer shell 7 and the concave portion 6e of the inner bag 6 are engaged with each other in the meat pool 3g, the inner bag 6 shrinks as the contents decrease. Even so, the inner bag 6 does not come off from the bottom 3b.

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

Further, the ratio d2 / d4 of the diameter d2 of the mouth portion 3d to the width d4 of the pinch-off portion 3p is, for example, 0.40 to 0.64, and specifically, for example, 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 It is .55, 0.56, 0.57, 0.58, 0.59, 0.60, 0.61, 0.62, 0.63, 0.64, and any of the numerical values exemplified here 2 It may be within the range between the two.

In addition, the inner container 3 of the present embodiment is formed so 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 accommodating 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, 0.52, and may be within the range between any two of the numerical values exemplified here.

The flange portion 3c is provided at the upper end of the body portion 3a. The flange portion 3c is provided so as to project outward in the radial direction from the body portion 3a. The outer diameter of the flange portion 3c is substantially 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 comes into contact with the support portion 2d, so that the inner container 3 is positioned in the vertical direction with respect to the outer container 2. That is, the flange portion 3c is supported by the outer container 2. Further, the outer peripheral surface of the flange portion 3c comes into contact with 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. When the flange portion 3c is in close contact with the enlarged diameter portion 2g and the support portion 2d, it becomes difficult for outside air to be introduced into the gap between the outer container 2 and the inner container 3. It is possible to distribute outside air through (see 6). The flange portion 3c is hollow, and the contents can be accommodated in the flange portion 3c as well.

A body gap 10 is provided between the body 3a of the inner container 3 and the body 2a of the outer container 2. This gap further enhances the heat insulating property. Assuming that the thickness of the outer shell 7 is Ts and the thickness of the body gap 10 is Tg, Tg / Ts ≧ 0.3 is preferable, and Tg / Ts ≧ 0.5 is even more preferable. In this case, the heat insulating property is particularly enhanced without thickening the outer shell 7. Tg / Ts is, for example, 0.3 to 5, and specifically, for example, 0.3, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4. It is 5, 5 and may be within the range between any two of the numerical values exemplified here.

Further, 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 also provided between the tips 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 with the discharge of the contents, the outside air is introduced between the inner bag 6 and the outer shell 7 through the outside air introduction hole 8. As a result, only the inner bag 6 is contracted, and the outer shell 7 is maintained in its original shape, so that a gap is formed between the inner bag 6 and the outer shell 7. This gap enhances the heat insulating property of the storage container and suppresses deterioration of the contents.

<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 cylinder portion 4a1, a cylinder portion 4a2, and an upper wall portion 4a3. A female screw portion 4a4 screwed into the male screw portion 3e is provided on the inner surface of the tubular portion 4a1. The cylinder portion 4a2 is inserted into the mouth portion 3d. The outer diameter of the cylinder portion 4a2 is substantially the same as the inner diameter of the mouth portion 3d. The cylinder portion 4a2 has a tubular shape, and the piston portion 4b is slidable in the cylinder portion 4a2. The internal space of the cylinder portion 4a2 communicates with the nozzle 4c and the tube 4d. A pump mechanism composed of an elastic member and a valve is built in the internal space of the cylinder portion 4a2. By sliding the piston portion 4b to operate the pump mechanism, it is possible to discharge the contents sucked up through the tube 4d from the nozzle 4c.

<Fixed ring 5>
As shown in FIG. 6, the fixing ring 5 includes an outer cylinder portion 5a, an upper wall portion 5b, and an inner cylinder portion 5d. The outer cylinder portion 5a and the inner cylinder portion 5d are connected by an upper wall portion 5b. On the inner surface of the outer cylinder portion 5a, a female screw portion 5f that can be screwed with the male screw portion 2f is provided. The upper wall portion 5b is provided with an opening 5c. The inner diameter of the opening 5c is larger than the outer diameter of the cylinder 4a2. Therefore, as shown in FIG. 1, with the pump 4 mounted on the mouth portion 3d and the fixing ring 5 mounted on the outer container 2, between the outer surface of the tubular portion 4a1 of the pump 4 and the inner surface of the opening 5c. There is a gap to allow ventilation. Further, when the fixing ring 5 is attached to the outer container 2 with the inner container 3 inserted into the outer container 2, the tip of the inner cylinder portion 5d abuts on the upper surface 3f of the inner container 3 so that the inner container 3 moves in the vertical direction. It is completely fixed to. In the flange portion 3c of the inner container 3, since the inner container 3 is unevenly fitted to the outer container 2, the inner container 3 can be fixed to the outer container 2 without providing the fixing ring 5. can. When the inner cylinder portion 5d is in close contact with the upper surface 3f, it becomes 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 cylinder portion 5d is provided with the outer air flow passage 5e. , The outside air can be circulated through the outside airflow passage 5e.

In the configuration of the present embodiment, outside air is introduced into the gap between the inner bag 6 and the outer shell 7 through the opening 5c, the outside airflow passages 5e and 2e, the body gap 10, the bottom gap 11, and the outside air introduction hole 8. NS. Therefore, even when the storage container 1 is suddenly exposed to a high temperature environment, it is difficult for the high temperature outside air to come into contact with the inner bag 6.

<Manufacturing method of inner container 3>
Next, a method of manufacturing the inner container 3 (laminated peeling container) of the present embodiment will be described.

First, as shown in FIG. 10I, a laminated structure corresponding to the inner container 3 to be manufactured (one example is composed of a PE layer / adhesive layer / EVOH layer in order from the inner surface side of the container as shown in FIG. 10I). A laminated parison P in a molten state having a laminated structure of an outer layer 13 composed of an inner layer 12 and a PP layer) is extruded from a die 50 (die head), and the laminated parison in this molten state is blow-molded into a die 40 (see FIGS. 11A and 11B). And close the pair of split molds 40A. The split mold 40A has a cavity shape such that various shapes of the inner container 3 such as the body portion 3a, the bottom portion 3b, and the flange portion 3c are formed on the blow molded product.

Here, with reference to FIGS. 11A, 11B, and 12A to 12C, molding of a shape near the bottom 3b of the inner container 3 by the blow molding die 40 will be described in detail. First, FIG. 11A is a schematic end view when the blow molding die 40 is cut in a direction perpendicular to the dividing surface. As shown in FIG. 11A, each of the split dies 40A of the blow molding die 40 includes a cut-out portion 42c. Further, below the cut-out portion 42c, a compression portion 42d that compresses the laminated parison P at the time of mold clamping is provided. Here, the width d3 of the compression portion 42d at the time of molding is twice or less the wall thickness d6 of the laminated parison P (see FIG. 12A). The ratio of d3 / d6 is, for example, 0.3 to 2, 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. It is .95, 1.00, and may be within the range between any two of the numerical values exemplified here.

Next, FIGS. 12A to 12C show a state in which the pair of split dies 40A are gradually closed to mold the laminated parison. When the split mold 40A is closed from the state before mold clamping in FIG. 12A, the cylindrical laminated parison P is pressed inward by the cut-out portion 42c of the split mold 40A, and as shown in FIG. 12B, the split mold 40A is first laminated. The inner layers 12 of the parison P come into contact with each other. When the split mold 40A is further closed from this state, the laminated parison is compressed by the cut-out portion 42c and the compression portion 42d. Then, as shown in FIG. 12C, when the mold is completely closed, the laminated parison P is separated into two by the cut-off portion 42c, and a pinch-off portion 3p is formed on the container side.

By the way, when the split mold 40A is closed as shown in FIGS. 12B to 12C, the laminated parison P having the outer layer 13 and the inner layer 12 is gradually compressed, but in the present embodiment, the mold 40 is compressed. Since the laminated parison P has the portion 42d, the lower portion (outside the container) of the laminated parison P is more compressed than the upper portion (inside the container) of the cut-out portion 42c. Therefore, the crushed laminated parison P tends to flow in the direction of the inside of the container having a wide space (see the arrow in FIG. 12B).

In addition, in the present embodiment, the diameter of the die 50, that is, the diameter d5 of the laminated parison P extruded from the die 50, is the mouth portion of the inner container 3 of the inner diameter of the mold 40 as shown in FIGS. 11A and 11B. The diameter is set to be slightly smaller than the inner diameter d2 of the portion forming 3d. The ratio of d5 / d2 is, for example, 0.6 to 0.9, more preferably 0.7 to 0.8. Specifically, the ratio of d5 / d2 is, for example, 0.70, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78. , 0.79, 0.80, and may be within the range between any two of the numerical values exemplified here. Here, if the diameter d5 of the laminated parison P is too large with respect to the inner diameter d2 of the portion forming the mouth portion 3d, there is a possibility that burr biting or the like may occur during molding, and the diameter d5 of the laminated parison P is small. If it is too much, molding becomes difficult, but by setting the ratio of d5 / d2 to the above value, the mouth portion 3d can be suitably molded.

By the way, in order to form the above-mentioned meat pool 3g, as shown in FIG. 11B, even if the laminated parison P is crushed flat from a cylindrical state by molding, the width of the crushed laminated parison P is sufficient. A certain folding diameter d7 (in this embodiment, this width substantially coincides with the width d4 of the pinch-off 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) is preferable. As a result, the crushed laminated parison P can flow outward in the radial direction inside the container, so that a meat pool of 3 g is likely to be formed. Here, the folding diameter d7 is larger than π / 2 times the diameter d5 of the laminated parison P (d5 × π / 2 <d7). Therefore, in order to satisfy the above conditions, in the present embodiment, the diameter d5 of the laminated parison P (diameter of the die 50) 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, 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, 0.42, and may be within the range between any two of the numerical values exemplified here.

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

Then, the molded product molded as described above is subjected to the known inner layer preliminary peeling step, the above-mentioned outside air introduction hole 8 forming step, and the like to complete the inner container 3.

<Manufacturing method and usage method of storage container 1>
In the storage container 1 of the present embodiment, after the inner container 3 is filled with the contents, the pump 4 mounted on the mouth 3d is inserted into the outer container 2, and the fixing ring 5 is inserted into the outer container 2 in that state. It can be manufactured by attaching it to.

As shown in FIG. 2, the contents may be fully filled so that there is no gap between the inner bag 6 and the outer shell 7, but as shown in FIG. 13, between the inner bag 6 and the outer shell 7. May be filled (that is, partially filled) so that a gap is provided in the bag. In this case, since there is a gap between the inner bag 6 and the outer shell 7 even in a state after the contents are filled and before the user starts discharging the contents, the heat insulating property is further improved. Assuming that the volume of the outer shell 7 is Vs and the volume of the contents contained in the inner bag 6 is Vc, it is preferable that Vc / Vs ≦ 0.95, and further that Vc / Vs ≦ 0.9. preferable. Vc / Vs is, for example, 0.5 to 0.95, specifically, for example, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, It is 0.85, 0.9, 0.95, and may be in the range between any two of the numerical values exemplified here.

As a method of partially filling the contents, for example, by sucking out the air in the inner bag 6 from the mouth portion 3d, the inner bag 6 is peeled from the outer shell 7 and the inner bag 6 is contracted, and then the contents are partially filled. There is a method of partially filling. According to such a method, the inner bag 6 can be partially filled so that air does not remain in the inner bag 6 while providing a gap between the inner bag 6 and the outer shell 7.

2. Second Embodiment Next, the laminated peeling container 3 of the second embodiment of the present invention will be described with reference to FIGS. 14 to 18. The container of the second embodiment is a squeeze type bottle, and does not have a member corresponding to the outer container 2 of the first embodiment. Further, the laminated peeling container 3 of the second embodiment is different from the inner container 3 of the first embodiment in that the valve member 20 is provided and the pinch-off portion 3p has the bottom seal protruding portion 3p. It is different. Hereinafter, the differences will be mainly described.

As shown in FIG. 14, the laminated peeling container 3 of the present embodiment includes a container body 3a and a valve member 20. The container body 3a includes an accommodating portion 3h for accommodating the contents and a mouth portion 3d for discharging the contents from the accommodating portion 3h.

As shown in FIG. 15, the container body 3a includes an outer layer 13 and an inner layer 12 in the accommodating portion 3h and the mouth portion 3d, the outer layer 13 constitutes the outer shell 7, and the inner layer 12 constitutes the inner bag 6. NS. As the content is reduced, the inner layer 12 is separated from the outer layer 13, so that the inner bag 6 is separated from the outer shell 7 and contracts.

The mouth portion 3d is provided with an engaging portion 3e that can be engaged with a cap (not shown) having a check valve. The cap may be attached by a plug type or a screw type.

As shown in FIG. 15, the valve member 20 is inserted into the outside air introduction hole 8 formed in the accommodating portion 3h, and has an intermediate space S1 between the outer shell 7 and the inner bag 6 and an outer space S2 of the container body 3a. It is for controlling the inflow and outflow of air between. As a configuration of the valve member 20, for example, the valve member 20 opens and closes the outside air introduction hole 8 by opening and closing the gap between the edge of the outside air introduction hole 8 and the valve member 20 by moving the valve member 20. The valve member 20 itself is provided with a through hole and a valve that can be opened and closed, and the through hole is opened and closed by the action of this valve, whereby the outside air introduction hole 8 can be opened and closed. It should be noted that the valve member 20 is not provided, and a filter is attached to the outside air introduction hole 8 to adjust the inflow and outflow of air, or the outside air introduction hole 8 is simply closed with a finger or the like when the contents are discharged for adjustment. It can also be configured to be performed. Further, a cap having an outside air introduction hole 8 provided in the mouth portion 3d and having a check valve communicating with the outside air introduction hole 8 may be used.

Regardless of the above configuration, the valve member 20 closes the outside air introduction hole 8 when the outer shell 7 is compressed so that the inner bag 6 can be compressed, and the compressive force on the outer shell 7 is released. Then, the outside air is configured to be introduced into the intermediate space S1.

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 in the valve member mounting recess 3j provided in the accommodating portion 3h so that the valve member 20 does not interfere with the shrink film. Further, an air flow groove 3k 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 with the shrink film (see FIG. 1).

Next, the region near the bottom 3b of the container body 3a of 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 accommodating portion 3h is provided with a central concave region 3s and a peripheral region 3t provided around the central concave region 3s, and the central concave region 3s is provided with a bottom seal protruding portion 3p protruding from the bottom surface. Is provided. In the present embodiment, the bottom seal protruding portion 3p corresponds to a pinch-off portion of the laminated parison in blow molding using the laminated parison. As shown in the enlarged cross-sectional view of FIG. 17B, the bottom seal protruding portion 3p includes a tapered portion 30 and a thinner portion 31 having a thinner thickness. The tapered portion 30 is tapered from the bottom surface to the tip end. The thin-walled portion 31 is formed at the tip position of the tapered portion 30. As shown in FIG. 16A, the tapered portion 30 and the thin-walled portion 31 are formed so as to cross the entire bottom portion 3b along the longitudinal direction of the bottom seal protruding portion 3p (left-right direction in FIG. 16B). Therefore, the peripheral edge region 3t is partially concave, and the central concave region 3s and the peripheral concave region 3u are connected at this portion. A recess within the scope of the claims is formed from the central concave region 3s and the peripheral concave region 3u. The cross-sectional shape of the thin portion 31 is a rectangle whose long side is perpendicular to the bottom surface. By the way, in the present embodiment, as shown in FIG. 17A, the bottom portion 3b is formed so that the central portion has a raised bottom, and the bottom seal protruding portion 3p is the ground contact surface F defined by the peripheral region 3t (see FIG. 17A). ), And the tip of the thin-walled portion 31 is located above the ground plane F.

In the container body 3a of the present embodiment, unlike the first embodiment, the outer shell 7 and the inner bag 6 are sealed at the bottom seal protruding portion 3p, and the outside air introduction hole is not formed in the bottom portion 3b (FIGS. 17A to 17C). reference). Here, "sealed" means that the cylindrical laminated parison is welded and the bottom is closed. In the present embodiment, the ratio of the inner layer 12 to the outer layer 13 in the bottom seal protruding portion 3p is smaller than the ratio of the inner layer 12 in other places such as other parts of the bottom 3b and the side surface of the container body 3a. .. Therefore, particularly at the tip portion of the bottom seal protruding portion 3p, as shown in FIG. 17B, the outer layers 13 are welded to each other in at least a part of the region, that is, the left and right outer layers 13 separated by the seal portion do not pass through the inner layer 12. It is configured to weld to. With such a configuration, it is possible to improve the impact resistance as compared with the configuration in which the entire outer layer 13 is welded via the inner layer 12 at the bottom seal protruding portion 3p. However, it is not essential that the inner layer 12 does not reach the thin-walled portion 31 and is interrupted in the tapered portion 30 as shown in FIG. 17B. For example, when the inner layer 12 is viewed macroscopically, it reaches the thin-walled portion 31. It may be in the form that has been reached. A manufacturing method by blow molding having a structure near the bottom 3b will be described later.

In the present embodiment, the ratio of the thickness t2 of the base end portion of the tapered portion 30 (see FIG. 17B) to the wall thickness t1 of the bottom portion 3b of the container body 3a is preferably 2.0 or less. Further, 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. preferable. Specifically, this ratio is, for example, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, It is 1.5 and may be within the range between any two of the numerical values exemplified here. The "thickness t1 of the bottom 3b" here refers to the thickness of the bottom 3b excluding the center of the bottom 3b, that is, the portion thicker than the periphery near the seal portion, for example, the tapered portion. It is defined as referring to the thickness of the bottom portion 3b at the position X separated from the base end portion of 30 by the same length as the length in the direction perpendicular to the bottom portion 3b of the bottom seal protrusion 3p (see FIG. 17B). Further, the ratio of the thickness t3 of the thin 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. preferable. Specifically, the ratio is, for example, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1. Yes, it may be within the range between any two of the numerical values exemplified here. In addition, the ratio of the length t5 of the thin portion 31 in the same direction to the length t4 in the direction perpendicular to the bottom 3b of the tapered portion 30 is preferably 0.05 to 0.3, and is 0.1 to 0. It is more preferably .25, and even 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, It is 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, and may be within the range between any two of the numerical values exemplified here.

As shown in FIGS. 17A and 17C, the container body 3a of the present embodiment also serves as an engaging portion in which the outer shell 7 and the inner bag 6 engage with the longitudinal end of the bottom seal protruding portion 3p. A meat pool of 3 g is formed. Specifically, as shown in FIG. 17C, in the meat pool 3g, the outer shell 7 has a pair of convex portions 7e protruding inward in the radial direction, and the inner bag 6 has a pair of concave portions 6e that engage with the convex portions 7e. It has. In the inner container 3 of the present embodiment, since the convex portion 7e of the outer shell 7 and the concave portion 6e of the inner bag 6 are engaged with each other in the meat pool 3g, the inner bag 6 shrinks as the contents decrease. Even so, the inner bag 6 does not come off from the bottom 3b.

Further, the ratios of the diameter d1 of the bottom portion 3b (bottom surface), the diameter d2 of the mouth portion 3d, and the width d4 of the bottom seal protruding portion 3p (corresponding to the pinch-off 3p portion of the first embodiment) in the present embodiment are the ratios of the first embodiment. The range is the same as that of the form.

The manufacturing method of the laminated peeling container 3 of the present embodiment is similar to the manufacturing method of the inner container 3 of the first embodiment, but the mold for forming the bottom 3b (bottom seal protruding portion 3p) of the laminated peeling container 3. The shapes of 40 are different. Hereinafter, using FIGS. 18A, 18B, and 19A to 19D, molding of a shape near the bottom 3b of the container body 3a by the blow molding die 40 will be described in detail. This point will be mainly described. In the present embodiment, the split mold 40A has a cavity shape such that various shapes of the container body 3a such as the valve member mounting recess 3j, the air flow groove 3k, and the bottom seal protrusion 3p are formed on the blow molded product. Has.

First, FIG. 18A is an enlarged view showing a portion of the blow molding die 40 for molding the vicinity of the bottom 3b of the container. As shown in FIG. 18A, the split mold 40A includes a bottom molding portion 41 for molding the bottom portion 3b and a protrusion molding portion 42 for molding the bottom seal protrusion 3p, respectively. More specifically, as shown in the enlarged view of FIG. 18B, the protruding molded portion 42 has a tapered surface 42a inclined so as to face the inside of the container and a thin-walled portion 31 for forming the tapered portion 30 of the bottom seal protruding portion 3p. A thin-walled molding portion 42b and a cut-out portion 42c are provided.

Next, FIGS. 19A to 19D show a state in which the pair of split dies 40A are gradually closed and the laminated parison P is molded. When the split die 40A is closed from the state before mold clamping in FIG. 19A, the cylindrical laminated parison P is pressed inward by the thin-walled molded portion 42b and the cut-out portion 42c of the split mold 40A, and is shown in FIG. 19B. As described above, first, the inner layers 12 of the laminated parison P come into contact with each other. When the split die 40A is further closed from this state, the laminated parison P is compressed by the thin-walled molded portion 42b, the cut-out portion 42c, and the tapered surface 42a, as shown in FIG. 19C. Then, as shown in FIG. 19D, when the mold is completely closed, the tapered portion 30 and the thin-walled portion 31 are formed, and the laminated parison P is separated into two by the cut-out portion 42c.

In this embodiment as well, the diameter d5 of the laminated parison P is set to a diameter slightly smaller than the inner diameter d2 of the portion of the inner diameter of the mold 40 that forms the mouth portion 3d of the inner container 3, and the ratio thereof is the same. 1 The range is the same as that of the embodiment.

By the way, when the split mold 40A is closed as shown in FIGS. 19B to 19D, the laminated parison P having the outer layer 13 and the inner layer 12 is gradually compressed, but in the present embodiment, the split mold 40A is used. Since the laminated parison P has a tapered surface 42a inclined so as to face the inside of the container, the laminated parison P is pressed toward the inside of the container (upward in FIGS. 19A to 19D). That is, in the present embodiment, the tapered surface 42a and the thin-walled molded portion 42b of the protruding molded portion 42 correspond to the compression portion 42d that compresses the laminated parison P at the time of mold clamping (see FIG. 18B). In the present embodiment, the compression portion 42d provided above the cut-out portion 42c (on the inner side of the container) makes it easy for the meat pool 3g to be formed. The inner layer 12 located inside the laminated parison P is easy to move toward the inside of the container having a wide space (see the arrows in FIGS. 19C and 19D), and the bottom seal protruding portion 3p (tapered portion) after mold clamping. In 30 and the thin portion 31), the ratio of the inner layer 12 to the outer layer 13 is smaller than that in the case where the split mold 40A does not have the tapered surface 42a. As a result, in the bottom seal protruding portion 3p, the outer layers 13 are compressed and welded to each other in at least a part of the region, and the inner layer 12 reaches the tip and the inner layers 12 are welded to each other. The impact resistance is improved, and it is possible to manufacture a laminated peeling container 3 in which the bottom seal protruding portion 3p does not separate even when an impact is applied. It has been experimentally confirmed that the provision of the thin-walled portion 31 also promotes the movement of the inner layer 12 toward the inside of the container.

In this embodiment, it is preferable to set the folding diameter d7 (width of the crushed laminated parison P) to be equal to or less than the width d4 of the bottom seal protruding portion 3p. The ratio of d4 / d7 is, for example, 0.8 to 1.0, and specifically, for example, 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, It is 0.99, 1.00, and may be within the range between any two of the numerical values exemplified here. When d4 / d7 takes such a value, a meat pool of 3 g is suitably formed.

The present invention can also be implemented in the following aspects.
-In the above-described embodiment, the bottom seal protruding portion 3p is composed of the tapered portion 30 and the thin-walled portion 31, but the thin-walled portion 31 is not essential. Even if the thin-walled portion 31 is not provided, since the bottom seal protruding portion 3p has a tapered shape, the outer layers 13 are welded to each other at the time of mold clamping, and the impact resistance can be improved.

1: Storage container 2: Outer container, 2a: Body part, 2b: Bottom part, 2c: Reduced diameter part, 2d: Support part, 2e: External airflow passage, 2f: Male thread part, 2g: Diameter expansion part, 3: Contents Vessel / laminated peeling container, 3a: body / container body, 3b: container bottom, 3c: flange, 3d: mouth, 3e: male thread / engaging, 3f: top surface, 3g: meat pool, 3h: storage Part, 3j: Valve member mounting recess, 3k: Air flow groove, 3p: Pinch-off portion / bottom seal protrusion, 3s: Central concave region, 3t: Peripheral region, 3u: Peripheral concave region, 4: Pump, 4a: Main body 4, 4a1: Cylinder part, 4a2: Cylinder part, 4a3: Upper wall part, 4a4: Female thread part, 4b: Piston part, 4c: Nozzle, 4d: Tube, 5: Fixing ring, 5a: Outer cylinder part, 5b: Upper wall Part, 5c: Opening, 5d: Inner cylinder part, 5e: Outer airflow passage, 5f: Female thread part, 6: Inner bag, 6a: Inner bag exposed part, 6e: Recessed part, 7: Outer shell, 7a: Holding part, 7e: Convex part, 8: Outside air introduction hole, 10: Body gap, 11: Bottom gap, 12: Inner layer, 13: Outer layer, 20: Valve member, 30: Tapered part, 31: Thin wall part, 40: Blow molded metal Mold, 40A: Divided mold, 41: Bottom molding part, 42: Projection molding part, 42a: Tapered surface, 42b: Thin wall molding part, 42c: Cut-out part, 42d: Compression part, 50: Die, P: Laminated parison, S1: Intermediate space, S2: External space

Claims (5)

A laminated peeling container having an outer shell and an inner bag, and the inner bag shrinks as the contents decrease.
It is provided with an accommodating portion for accommodating the contents and a pinch-off portion formed on the bottom surface of the accommodating portion.
At the end of the pinch-off portion in the longitudinal direction, a meat pool that is thicker than the surroundings is formed by projecting toward the inside of the container.
The outer shell is a laminated peeling container provided with a convex portion protruding inward in the radial direction in the meat pool, and the inner bag is provided with a concave portion that engages with the convex portion in the meat pool. The laminated stripping container according to claim 1, further comprising a mouth portion for discharging the contents from the housing portion, wherein the diameter of the mouth portion is smaller than 2 / π times the diameter of the bottom surface of the housing portion. The laminated peeling container according to claim 1 or 2 , wherein the pinch-off portion is provided with an outside air introduction hole for introducing outside air into the space between the outer shell and the inner bag. The laminated peeling container according to claim 1 or 2 , wherein the pinch-off portion includes a protruding portion protruding outside the container. A method for manufacturing a laminated peeling container having an outer shell and an inner bag and shrinking the inner bag as the contents decrease.
A blow molding step using a cylindrical laminated parison including an outer layer constituting the outer shell and an inner layer constituting the inner bag is provided.
Die diameter extruding the laminated parison state, and are 2 / [pi times or less of the inner diameter of the portion forming the bottom of the mold for molding the delamination container in the blow molding step inside diameter,
The mold is in the vicinity of the cut-off portion for forming the pinch-off portion of the laminated peeling container, and the laminated parison is compressed into a container at a position outside the container from the cut-off portion before molding. Equipped with a compression section that flows inward,
The compression unit (excluding 0.5 times) the width at the time of mold clamping 0.5-1 times the thickness of the laminated parison der Ru, manufacturing method of a multilayer peeling vessel.

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