CN114502475A - Storage container and its manufacturing method, double-layered container and its manufacturing method - Google Patents

Abstract

The invention provides a storage container with excellent appearance. According to the present invention, there is provided a storage container including a container body integrally formed with an outer cover so as to cover an outer peripheral surface of an inner container, the outer cover being injection-molded, the inner container including an outermost layer and an adjacent layer adjacent to the outermost layer, a melting point of an outermost layer resin constituting the outermost layer being lower than a melting point of an adjacent layer resin constituting the adjacent layer.

Description

Storage container and its manufacturing method, double-layered container and its manufacturing method

technical field

The present invention relates to a container capable of accommodating contents and a manufacturing method thereof, as well as a double-layer container and a manufacturing method thereof.

Background technique

(1st point of view)

Today, there is known a lamination peel container (eg, Patent Document 1) that suppresses the entry of air into the interior of the container by reducing the shrinkage of the inner bag with the content.

(2nd point of view)

There is known a double-layered container (laminated peelable container) which has an outer shell and an inner bag and can accommodate the contents in the inner bag (for example, Patent Document 2). The outer casing can be pressed from the outside, and the contents accommodated in the inner bag flow out from the mouth by this pressing. After pressing, air is introduced between the outer casing and the inner bag through the check valve provided in the outer casing, so that the shape of the outer casing is restored, and the inner bag gradually shrinks.

(3rd point of view)

Patent Document 3 discloses a method of manufacturing a double-layered container by blow molding in a state where an inner preform and an outer preform are overlapped.

prior art documents

patent document

Patent Document 1: Japanese Patent Laid-Open No. 2015-163531

Patent Document 2: Japanese Patent Application Laid-Open No. 2018-087036

Patent Document 3: WO2004/071887

SUMMARY OF THE INVENTION

(The problem to be solved by the invention)

(1st point of view)

The layered peelable container of Patent Document 1 is constituted by covering the outer peripheral surface of the container formed by blow molding with a shrink film, but sometimes a more advanced design is required.

The present invention has been made in view of the above-mentioned circumstances, and provides a storage container having an excellent appearance.

(2nd point of view)

However, in the prior art described in Patent Document 2, since the air introduction hole through which the check valve is inserted is located near the mouth, air needs to be introduced from the lower side of the container to the upper side immediately after taking out the contents, which is not efficient.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a double-layered container in which the inner bag can be peeled off from the outer shell more efficiently after the contents are taken out.

(3rd point of view)

The inner bag is formed by the inner preform, and the outer shell is formed by the outer preform. The shrinkage of the inner bag is reduced according to the content of the inner bag, but the outer air is introduced into the intermediate space between the inner bag and the outer casing from the outer air introduction hole provided in the outer casing, and the outer casing can maintain its original state.

In this double-layered container, the inventors of the present invention found that the introduction of the outside air into the intermediate space between the inner bag and the outer casing was sometimes difficult when the outside air introduction hole was provided at the bottom of the container in consideration of aesthetics and other factors.

The present invention has been made in view of the above-mentioned circumstances, and provides a double-layered container capable of smoothly introducing external air into the intermediate space between the inner bag and the outer casing even when the external air introduction hole is provided at the bottom of the container body.

(Technical solutions for solving problems)

(1st point of view)

According to the present invention, there is provided a container including a container body integrally formed with an outer casing so as to cover an outer peripheral surface of an inner container, the outer casing being an injection-molded body, and the inner container including an outermost layer and an outermost layer and the outermost layer. In the adjacent layer adjacent to the outer layer, the melting point of the resin of the outermost layer constituting the outermost layer is lower than the melting point of the resin of the adjacent layer constituting the adjacent layer.

The storage container of the present invention has an excellent appearance because the outer shell composed of the injection-molded body is integrally formed with the outer peripheral surface of the inner container. Furthermore, since the melting point of the resin of the outermost layer is lower than that of the resin of the adjacent layer, the thermal energy of the molten resin used for injection molding the outer jacket is not easily transmitted to the inner container, thereby suppressing deformation of the inner container. In addition, since the melting point of the resin in the outermost layer is lower than that of the resin in the adjacent layer, the adhesion between the outer casing and the outermost layer is improved, thereby suppressing the adhesive surface between the outer peripheral surface of the inner container and the outer casing due to impact such as dropping. stripped.

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

It is preferable that the difference between the melting point of the resin of the outermost layer of the container and the melting point of the resin of the adjacent layer is 5° C. or more.

It is preferable that the wall thickness of the outermost layer is 10% or more of the wall thickness of the inner container of the storage container.

It is preferable that the said outermost layer resin of the said storage container contains unmodified polyolefin.

It is preferable that the said outermost layer resin of the said storage container contains acid-modified polyolefin and the said unmodified polyolefin.

It is preferable that the resin constituting the outer layer of the storage container has the same monomer unit as the resin of the outermost layer.

It is preferable that the said inner container of the said storage container is comprised so that it may have an outer shell and an inner bag, and the said inner bag shrink|contraction is reduced according to a content, and the said outermost layer and the said adjoining layer are provided in the said outer shell.

Preferably, the method for manufacturing a storage container includes an integral molding step of integrally molding an inner container and an outer casing, and in the integral molding step, in a state where the outer peripheral surface of the inner container is disposed in the mold, the inner container is placed in the cavity of the mold. A space-filling resin on the outer side of the inner container forms the outer shell, the inner container includes an outermost layer and an adjacent layer adjacent to the outermost layer, and the outermost layer resin constituting the outermost layer has a melting point ratio of the outermost layer. The melting point of the adjacent layer resin of the adjacent layer is low.

Preferably, the method pressurizes the inside of the inner container during the integral molding step.

Preferably, in the integral molding step of the method, the resin is filled in a state where the inner surface of the bottom surface of the inner container is pressed with a support rod inserted into the inner container.

(2nd point of view)

According to one aspect of the present invention, there is provided a double-layered container including an outer shell, an external air introduction hole, and an inner bag, the outer shell being configured to be pressable from the outside, and the content contained in the inner bag is caused by the pressing. The material flows out from the mouth, and the outside air introduction hole is arranged in a specific area on the bottom side of the casing, and the bottom side refers to the side away from the mouth when the double-layer container is divided into two in the height direction, and is configured to fit with a check valve, and through the check valve, after the content flows out, air is introduced into the space between the inner side of the outer casing and the outer side of the inner bag to restore the outer casing The inner bag is configured to be compressed and contracted by the air introduced into the intermediate space when the content decreases.

Provided on the bottom side of the outer casing by a specific area where the air introduction hole is provided, the double-layered container has an advantageous effect that the inner bag can be effectively peeled from the outer casing immediately after the contents are taken out.

(3rd point of view)

According to the present invention, there is provided a double-layered container including a container body having an outer shell and an inner bag, and the inner bag shrinks as the content decreases, the container body having a cylindrical body portion and a body provided under the body portion. The bottom of the end, the bottom is provided with a central concave part provided in the center of the bottom part and a peripheral part surrounding the central concave part, in the central concave part, an outside air introduction hole is provided in the casing, and an external air introduction hole is provided in the peripheral edge part. A spacer to form a gap between the outer shell and the inner bag.

The present inventors conducted detailed studies and found that when a central concave portion is provided at the bottom of the container body, it is difficult to form a gap between the inner bag and the outer shell at the peripheral portion surrounding the central concave portion. It is easy to introduce external air into the trunk of the container body. In addition, based on this finding, by providing a spacer member for forming a gap between the outer casing and the inner bag, the outside air can be smoothly introduced into the body portion from the outside air introduction hole in the bottom through the peripheral portion, and the present invention has been completed. .

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

Preferably, the spacer member of the double-layer container is a protrusion provided on the outer shell or the inner bag.

Preferably, the spacer members of the double-layer container are radially arranged.

Preferably, the spacer member of the double-layer container is arranged to form a discontinuous circle.

Preferably, the inner preform and the outer preform are formed in a state where the container body of the double-layered container covers the inner preform that constitutes the inner bag and the outer preform that constitutes the outer shell. The blank is heated for blow molding.

Preferably, the inner preform of the double-layer container is provided with positioning pins at the bottom of the inner preform, the outer preform is provided with positioning holes at the bottom of the outer preform, and the blow molding The forming is performed in a state in which the positioning pin is inserted into the positioning hole.

Description of drawings

FIG. 1 is a perspective view of a storage container 101 according to the first embodiment of the first viewpoint.

FIG. 2 is a perspective view of the container body 102 .

FIG. 3 is a cross-sectional view of the container body 102 .

FIG. 4 shows the layered configuration of the container body 102 in the area A in FIG. 3 .

FIG. 5 is a perspective view of the inner container 104 .

FIG. 6 is a cross-sectional view of the inner container 104 .

FIG. 7 is a cross-sectional view for explaining an integral molding process.

FIG. 8 is an enlarged view of the area B in FIG. 7 .

In FIG. 9 , FIGS. 9A to 9B are perspective views when the storage container 101 according to the second embodiment is viewed from different directions.

FIG. 10 is a cross-sectional view of the container body 102 of FIG. 9A.

FIG. 11 shows the layered configuration of the container body 102 in the region C in FIG. 10 .

FIG. 12 is a cross-sectional view showing only the inner container 104 in FIG. 10 .

FIG. 13 is a perspective view of the pump 112 .

14 is an enlarged view showing the vicinity of the mouth portion 108 of FIG. 5 in a state in which the outside air introduction portion 115 is provided in the mouth portion 108 of the inner container 104 in the third embodiment.

FIG. 15 is a perspective view of the double-layered container 1 according to the first embodiment showing the second viewpoint.

FIG. 16 shows a state in which the cover 30 is removed from the state shown in FIG. 15 .

FIG. 17 shows a front view and a rear view of the double-layered container 1 according to the first embodiment of the second viewpoint.

FIG. 18 shows a state in which the cover 30 is removed from FIG. 17 .

FIG. 19 shows a left side view and a right side view of the double container 1 according to the first embodiment of the second viewpoint.

FIG. 20 shows a state in which the cover 30 is removed from the state shown in FIG. 19 .

FIG. 21 shows a top view and a bottom view of the double container 1 according to the first embodiment of the second viewpoint.

FIG. 22 shows a state in which the cover 30 is removed from the state shown in FIG. 21 .

FIG. 23 is an end view showing the internal structure of the double container 1 according to the first embodiment of the second viewpoint.

FIG. 24 shows the detailed structure of the check valve 6 .

FIG. 25 is a perspective view of the double container 1 according to the second embodiment of the second viewpoint.

FIG. 26 shows a state in which the cover 30 is removed from the state shown in FIG. 25 .

FIG. 27 shows a front view and a rear view of the double container 1 according to the second embodiment of the second viewpoint.

FIG. 28 shows a state in which the cover 30 is removed from the state shown in FIG. 27 .

FIG. 29 shows a left side view and a right side view of the double-layered container 1 according to the second embodiment of the second viewpoint.

FIG. 30 shows a state in which the cover 30 is removed from the state shown in FIG. 29 .

FIG. 31 shows a top view and a bottom view of the double container 1 according to the second embodiment of the second viewpoint.

FIG. 32 shows a state in which the cover 30 is removed from the state shown in FIG. 31 .

FIG. 33 is an end view showing the internal structure of the double container 1 according to the second embodiment of the second viewpoint.

Fig. 34 shows the container body 202 of the double container 201 according to the first embodiment of the third aspect of the present invention, Fig. 34A is a front view, and Fig. 34B is a bottom view.

In FIG. 35 , FIG. 35A is a perspective view of the container body 202 of FIG. 34 viewed from the bottom part 207 , and FIG. 35B is a cross-sectional perspective view of the vicinity of the bottom part 207 of the casing 203 viewed from the inside of the container.

In Fig. 36, Fig. 36A is a sectional view taken along AA in Fig. 34B, and Fig. 36B is a sectional view taken along BB in Fig. 36A.

FIG. 37 is a perspective view showing a state in which the inner preform 214 and the outer preform 213 are separated.

FIG. 38 is a cross-sectional perspective view of the vicinity of the bottom 213 c of the outer preform 213 of FIG. 37 as viewed from the inner side of the outer preform 213 .

In FIG. 39, FIG. 39A is a perspective view of the assembly 215 constructed by covering the outer preform 213 on the inner preform 214, and FIG. 39B is a perspective view when FIG. 39A is viewed from another angle.

FIG. 40 is a cross-sectional view of a state in which the module 215 is attached to the mouth support mold 221, showing a biaxial stretch blow molding process.

FIG. 41 is a cross-sectional view showing a state in which the forming dies 223 and 224 are closed from the state shown in FIG. 40 , and the bottom supporting die 222 supports the bottom 213 c of the outer preform 213 .

42 is a cross-sectional view of a state in which the support rod 225 is extended from the state shown in FIG. 41 and the bottom support die 222 is retracted to extend the assembly 215 longitudinally.

FIG. 43 shows the outer preform 213 having the protrusion 213c1 having a discontinuous circular shape, and is a cross-sectional perspective view corresponding to FIG. 38 .

FIG. 44 is a perspective view of the inner preform 214 having a configuration in which radial projections 214c2 are provided on the bottom 214c.

FIG. 45 is a perspective view of the inner preform 214 showing the configuration in which the protrusions 214c2 having a discontinuous circle are provided on the bottom 214c.

FIG. 46 is an enlarged view of the vicinity of the bottom 214g of the inner preform 214 of the modification.

Detailed ways

Embodiments of the present invention will be described below. Various characteristic matters shown in the embodiments shown below can be combined with each other. And, each feature can independently constitute the present invention.

(1st point of view)

1. The first embodiment

As shown in FIG. 1 , the storage container 101 according to the first embodiment of the present invention includes: a container body 102; The bolt-opening member 103 may be a pump or a hinged lid or the like. As shown in FIG. 3 , the container body 102 includes an inner container 104 and an outer casing 105 integrally formed therewith. Each configuration will be described below.

<Inner container 104>

The inner container 104 shown in FIGS. 5 to 6 may be a container formed by any manufacturing method, and among them, a blow-molded container formed by blow-molding a parison is preferable. Blow molding can be direct blow molding or injection blow molding. In direct blow molding, a parison in a molten state extruded from an extruder is sandwiched between a pair of divided dies, and air is blown into the parison to manufacture a container. The parison can be cylindrical or sheet-like. In injection blow molding, a test tube-shaped bottomed parison called a preform is injection-molded, and the parison is then blow-molded to manufacture a container.

It is particularly important to apply the present invention to the inner container 104 of a multi-layer structure since it is not easy to manufacture an injection-molded container of a multi-layer structure. When forming the inner container 104 of the multilayer structure, the parison also has the multilayer structure. The parison of the multilayer structure (multi-layer parison) can be formed by co-extrusion.

The inner container 104 has a bottomed cylindrical shape, and includes an accommodating portion 107 for accommodating the contents, and a mouth portion 108 for discharging the contents from the accommodating portion 107 . The housing portion 107 includes a body portion 107a and a bottom portion 107b. The opening part 108 is provided with the engaging part (external thread part) 8a, and the opening member 103 can be attached.

When the inner container 104 is formed by direct blow molding, the inner container 104 has a pinch-off portion 107c (shown in FIG. 6 ) formed by extruding the parison with a pair of divided dies. The pinch-off portion 107c is provided at the bottom portion 107b of the inner container 104, and at the pinch-off portion 107c, the bottom portion of the inner container 104 is closed by welding the opposing surfaces of the parisons to each other. The shape of the accommodating portion 107 may be various shapes such as a cylindrical shape, a polygonal prism shape, a polygonal pyramid shape, and a spherical shape.

As shown in FIG. 4 , the inner container 104 includes an outermost layer 104c1 , an adjacent layer 104c2 , and another layer 104c3 in this order from the outer side of the inner container 104 . Examples of the raw material constituting the inner container 104 include unmodified polyolefin, acid-modified polyolefin, EVOH, and the like. Examples of polyolefins include low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymers, and mixtures thereof.

The melting point of the outermost layer resin constituting the outermost layer 104c1 is lower than the melting point of the adjacent layer resin constituting the adjacent layer 104c2. Although the thermal energy of the molten resin at the time of injection molding the outer jacket 105 has a concern of softening and deforming the inner container 104, when the melting point of the resin of the outermost layer is lower than the melting point of the resin of the adjacent layer, the resin of the outermost layer is melted by the thermal energy of the molten resin, At this time, the outermost resin absorbs heat energy, so that the heat energy transferred to the inner container 104 is reduced, so that the deformation of the inner container 104 caused by injection molding can be suppressed. In addition, since the outermost layer 104c1 is easily melted, the adhesiveness between the outer casing 105 and the outermost layer 104c1 can be improved, and peeling of the adhesive surface between the outer peripheral surface of the inner container 104 and the outer casing 105 due to impact such as dropping can be suppressed. In addition, in this specification, "melting point" means the melting peak temperature Tpm measured according to JIS K7121:2012.

The difference between the melting point of the outermost layer resin and the melting point of the adjacent layer resin is preferably 5°C or higher, more preferably 10°C or higher, and further preferably 20°C or higher. This is because the effects of suppressing deformation and improving adhesiveness are remarkable in this case. The difference in melting point is, for example, 5 to 50°C, specifically, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50°C, or between any two values shown here. scope.

The melting point of the outermost layer resin is, for example, 90 to 130°C, or preferably 100 to 120°C. Specifically, the melting point may be, for example, 90, 95, 100, 105, 110, 115, 120, 125, or 130° C., or may be a range between any two numerical values shown here.

The thickness of the outermost layer 104c1 is preferably 10% or more, preferably 15% or more, and more preferably 20% or more with respect to the thickness of the inner container 104 . This is because the effects of suppressing deformation and improving adhesiveness are remarkable in this case. With respect to the wall thickness of the inner container 104, the wall thickness of the outermost layer 104c1 is, for example, 10 to 50%. A range between any 2 values shown here.

The outermost layer resin preferably contains polyolefin. The polyolefin may be an unmodified polyolefin or a modified polyolefin (eg, acid-modified polyolefin).

The outermost layer resin preferably contains unmodified polyolefin. When the outermost layer resin is composed of only modified polyolefin, the outermost layer 104c1 may be sticky so that the handleability of the inner container 104 is deteriorated. The unmodified polyolefin is preferably polyethylene, and more preferably contains one or both of LDPE and LLDPE. This is because the melting point of the outermost layer resin tends to be low in this case.

The outermost resin may also contain acid-modified polyolefin and unmodified polyolefin. The acid-modified polyolefin is excellent in adhesiveness. Therefore, by containing the acid-modified polyolefin and the unmodified polyolefin in the outermost resin, it is possible to improve the adhesion between the outer casing 105 and the inner container 104 while suppressing excessive stickiness. Adhesion. The content of the acid-modified polyolefin in the outermost layer resin is, for example, 5 to 95% by mass, or preferably 30 to 70% by mass. Specifically, the content may be 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, or 95 mass %, or may be a range between any two numerical values shown here.

The adjacent layer 104c2 is a layer adjacent to the outermost layer 104c1. The adjoining layer resin constituting the adjoining layer 104c2 may be any resin having a higher melting point than that of the outermost layer resin. For example, when the outermost layer resin is LDPE, HDPE, PP, or the like having a melting point higher than LDPE can be used as the adjacent layer resin. In addition, as the adjacent layer resin, a recycled resin obtained by recovering and reusing the burrs generated in the previous production process can also be used. When the melting point of the resin forming any of the layers constituting the inner container 104 is higher than the melting point of the outermost layer 104c1, the melting point of the regenerated resin thereof is also generally higher than that of the outermost layer resin.

With respect to the wall thickness of the inner container 104, the wall thickness of the adjoining layer 104c2 is, for example, 5-70%, and specifically may be, for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70%, and the range between any two numerical values shown here may be sufficient.

The other layer 104c3 refers to a layer located closer to the inner side of the inner container 104 than the adjoining layer 104c2. The other layer 104c3 is preferably made of a resin excellent in heat resistance and rigidity, and may be made of, for example, a polypropylene resin. Other layers 104c3 may be omitted when not required. The wall thickness of the adjoining layer 104c2 is preferably 20% or more relative to the wall thickness of the inner container 104 . In this case, the other layers 104c3 can easily improve the heat resistance or rigidity of the inner container 104. With respect to the wall thickness of the inner container 104, the wall thickness of the adjacent layer 104c2 is, for example, 0 to 70%, specifically, 0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60 , 65, 70%, and may be a range between any two values shown here.

The inner container 104 is a multi-layer container of 6 layers such as 5 types, and the specific layer structure thereof is shown, for example, as follows. The adhesive layer is a layer made of an adhesive resin such as acid-modified polypropylene.

【Table 1】

As shown in Table 2, the adjoining layer 104c2 may be a recycled resin layer. The recycled resin contains various resins constituting the outermost layer 104c1 and the other layers 104c3. Since the melting point of the resin constituting the other layer 104c3 is higher than that of the outermost layer resin, the melting point of the recycled resin is also higher than that of the outermost layer. The resin has a high melting point.

【Table 2】

＜ Jacket 105 ＞

As shown in FIGS. 2 to 3 , the outer casing 105 is integrally molded so as to cover the outer peripheral surface 104a (preferably the outer peripheral surface 104a and the bottom surface 104b ) of the inner container 104 , and is an injection-molded body. The casing 105 includes a cylindrical portion 105a and a bottom portion 105b. The cylindrical portion 105a and the bottom portion 105b cover the outer peripheral surface 104a and the bottom surface 104b, respectively. The jacket 105 covers at least the accommodating portion 107, and the mouth portion 108 may or may not be covered.

The resin constituting the outer jacket 105 preferably has the same monomer unit as that of the outermost layer resin constituting the outermost layer 104c1. In this case, peeling of the adhesive surface between the outer casing 105 and the outer peripheral surface 104a can be suppressed when dropped. For example, polyethylene may be used for the outermost layer 104c1 of the inner container 104, and an ionomer resin of an ethylene-(meth)acrylic copolymer may be used for the outer jacket 105. In this case, both resins contain ethylene units.

The container body 102 can be manufactured by a method including an integral molding process of integrally molding the inner container 104 and the outer shell 105 . As shown in FIGS. 7 to 8 , in the integral molding step, the mouth portion 108 is fixed to the fixing portion 110 having the opening portion 110 a, and the outer peripheral surface 104 a (preferably the outer peripheral surface 104 a and the bottom surface 104 b ) of the inner container 104 are arranged The support rod 111 is inserted into the inner container 104 in the state in the mold 109 for injection molding, and the support rod 111 is pressed against the inner surface of the bottom surface 104b. Accordingly, displacement of the housing portion 107 of the inner container 104 during injection molding can be suppressed.

In this state, resin is filled into the space outside the inner container 104 in the cavity 109 a of the mold 109 to form the outer casing 105 . At this time, it is preferable to pressurize the inside of the inner container 104 so that the inner container 104 is not deformed by the resin pressure. Pressurization can be done by blowing in water or air. The resin is filled into the cavity 109a from the shutter 109b. The shutter 109b is preferably arranged at a position facing the bottom surface 104b (preferably the pinch-off portion 107c ) of the inner container 104 . This is because in this case it is easy to uniformly fill the resin into the whole around the inner container 104 .

The resin for injection molding preferably has fluidity required for injection molding at a temperature lower than the melting point of the resin constituting the outermost layer 104c1 of the inner container 104. The melting point of the resin for injection molding is, for example, 60 to 100°C, preferably 70 to 90°C. Specifically, the melting point is, for example, 60, 65, 70, 75, 80, 85, 90, 95, and 100° C., and may be a range between any two numerical values shown here.

The difference between the melting point of the resin for injection molding and the melting point of the outermost layer resin is preferably 5°C or higher, more preferably 10°C or higher, and further preferably 20°C or higher. The difference between the melting points is, for example, 5 to 50° C., for example, 5, 10, 15, 20, 25, 30, 35, 40, 45, and 50° C., or between any two values shown here. range.

The resin temperature at the time of injection molding is preferably 180 to 230°C. If the temperature is too low, the pressure will be high during injection, and if the temperature is too high, air will be easily mixed in during injection. Specifically, the resin temperature is, for example, 180, 185, 190, 195, 200, 205, 210, 215, 220, 225, and 230° C., and may be a range between any two numerical values shown here.

2. Second Embodiment

Next, a second embodiment of the present invention will be described. This embodiment is similar to the first embodiment in that the inner container 104 has an outer shell 113 and an inner bag 114 as shown in FIGS. 11 to 12 , and the inner bag 114 shrinks as the content decreases, that is, the part constituting the laminated peelable container is mainly difference. The following description will focus on this difference.

In the present embodiment, the inner bag 114 is separated and contracted from the outer casing 113 by separating the inner bag 114 from the outer casing 113 as the content decreases in the layered and peelable container. In this container, since outside air does not easily enter the inner bag 114, deterioration of the contents can be suppressed.

As shown in FIG. 11 , the casing 113 includes, for example, an outermost layer 113c1 , an adjacent layer 113c2 , and other layers 113c3 . The inner bag 114 includes, for example, an outermost layer 114c1, an adhesive layer 114c2, and an inner surface layer 114c3. The outermost layer 113c1 and the adjacent layer 113c2 correspond to the outermost layer 104c1 and the adjacent layer 104c2 according to the first embodiment, and their configuration and effects are the same as those of the first embodiment.

The other layer 113c3, the outermost layer 114c1, the adhesive layer 114c2, and the inner surface layer 114c3 correspond to the other layer 104c3 of the first embodiment. The other layer 113c3 and the inner surface layer 114c3 may be composed of low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer and mixtures thereof, and the like. The outermost layer 114c1 is a layer excellent in releasability from the other layers 113c3, and is preferably composed of an ethylene-vinyl alcohol copolymer (EVOH) resin or the like. The adhesive layer 114c2 is preferably made of an adhesive resin such as acid-modified polyolefin.

As shown in FIG. 12 , the pinch-off portions 107c block the bottoms of the outer casing 113 and the inner bag 114, respectively. However, since the strength of the pinch-off portions 107c on the outer casing 113 is particularly weak, the outer casing 113 can be opened by applying an impact to the outer casing 113. The pinch-off portion 107c forms the outside air introduction portion 115 . Outside air may be introduced between the outer case 113 and the inner bag 114 through the outside air introduction portion 115 . The outside air introduction portion 115 may be formed by perforating the casing 113 . The outside air introduction portion 115 may be provided in the accommodating portion 107 or may be provided in the mouth portion 108 .

When the outside air introduction portion 115 of the inner container 104 is covered by the outer casing 105 , the outside air cannot be introduced through the outside air introduction portion 115 . Therefore, the outer casing 105 is provided with a ventilation portion 105c that communicates with the outer space of the housing container 101 and the outside air introduction portion 115 . The ventilation portion 105c may be a through hole or a groove. The ventilation portion 105c may be formed during injection molding, or may be formed by post-processing after injection molding.

When the casing 105 does not cover the mouth portion 108, if the outside air introduction portion 115 is provided on the mouth portion 108, the ventilation portion 105c is not required.

When forming the vent portion 105c during injection molding, for example, a pin can be arranged at a portion corresponding to the vent portion 105c, and then the pin pin can be pulled out from the outer casing 105 when the container body 102 is removed from the mold 109.

The inner container 104 preferably peels off the inner bag 114 before the integral molding process. This is because it is easy to pre-peel before the outer casing 105 is integrally formed in the inner container 104 .

<Pump 112>

The pump 112 is configured to discharge the contents from the inner container 104 . When the inner container 104 is a lamination and peeling container, the pump 112 is preferably configured so as not to introduce external air into the inner container 104 .

As shown in FIG. 13 , the pump 112 includes a main body portion 112a, a piston portion 112b, a nozzle 112c, and a tube 112d. The main body portion 112a includes a cylindrical portion 112a1, a cylinder portion 112a2, and an upper wall portion 112a3. An engaging portion (female thread portion) (not shown) that engages with the engaging portion (external thread portion) 108a is provided on the inner surface of the cylindrical portion 112a1. The cylinder portion 112a2 is inserted into the mouth portion 108 . The outer diameter of the cylinder portion 112a2 is substantially the same as the inner diameter of the mouth portion 108 . The cylinder part 112a2 is cylindrical, and the piston part 112b is slidable in the cylinder part 112a2. The inner space of the cylinder part 112a2 communicates with the nozzle 112c and the pipe 112d. A valve mechanism including an elastic member and a valve is housed in the inner space of the cylinder portion 112a2. By sliding the piston part 112b to operate the valve mechanism, the suctioned contents can be discharged from the nozzle 112c through the inlet pipe 112d.

3. Third Embodiment

A third embodiment of the present invention will be described with reference to FIG. 14 . This embodiment is similar to the second embodiment, and the main difference is that the outside air introduction portion 115 is provided at the mouth portion 108 of the inner container 104 . Next, the distinguishing features will be explained.

When the case 113 is sealed, the outside air introduction portion 115 is not provided in the pinch portion 107c, and it is preferable to provide the outside air introduction portion 115 with a through hole in the case 113 . In this case, the outside air introduction portion 115 is preferably provided at a portion of the inner container 104 that is not covered by the outer casing 105 . In this case, the vent portion 105c may not be provided on the outer casing 105 .

As shown in FIG. 14, it is preferable to provide the external air introduction part 115 in the mouth part 108, and it is especially preferable to provide in the position covered with the cylindrical part 112a1 of the pump 112 shown in FIG. In this case, in the state where the pump 112 is attached, the external air introduction part 115 is not visible, so the appearance is good. The outside air introduction portion 115 can ventilate to the outside through a gas passage such as a gap between the piston portion 112b and the cylindrical portion 112a1 or a gap between the lower end of the cylindrical portion 112a1 and the inner container 104 .

The outside air introduction portion 115 is preferably provided on the flat portion 108b provided in the mouth portion 108 . In this case, the outside air introduction portion 115 can be easily formed using a drilling tool such as a drill. The flat portion 108b may be provided at a position closer to the accommodating portion 107 than the engaging portion 108a, or may be provided so as to divide the engaging portion 108a. In the latter case, there is an advantage that it is not necessary to extend the mouth portion 108 in order to provide the flat portion 108b.

(2nd point of view)

1. The first embodiment of the second viewpoint

In this section, the structure of the double container 1 according to the first embodiment will be described. FIG. 15 is a perspective view of the double container 1 according to the first embodiment. FIG. 16 shows a state in which the cover 30 is removed from the state shown in FIG. 15 . FIG. 17 shows a front view and a rear view of the double container 1 according to the first embodiment. FIG. 18 shows a state in which the cover 30 is removed from the state shown in FIG. 17 . FIG. 19 shows a left side view and a right side view of the double container 1 according to the first embodiment. FIG. 20 shows a state in which the cover 30 is removed from the state shown in FIG. 19 . FIG. 21 shows a top view and a bottom view of the double container 1 according to the first embodiment. FIG. 22 shows a state in which the cover 30 is removed from the state shown in FIG. 21 .

1.1 Subject 2

The double-layered container 1 is a so-called lamination peeling container. As shown in FIGS. 15 to 22 , the double-layered container 1 includes the main body 2 (the outer casing 21 and the inner bag 22 ) and the outside air introduction hole 52 . The housing 21 can be pressed from the outside. It is configured to flow out the contents accommodated in the inner bag 22 (accommodating space 26 ) from the mouth 3 by pressing. The inner bag 22 is configured to contract by being pressed by the air introduced into the intermediate space 25 through the outside air introduction hole 52 after the content is reduced.

The outer shell 21 and the inner bag 22 are blow-molded by a multi-layer parison method, and are integrally formed. The use state is to peel off the inner bag 22 from the outer shell 21 before use, and then fill the inner bag 22 with the contents. contact with the housing 21 . When the content is extruded, the inner bag 22 shrinks smoothly. Alternatively, the inner bag 22 may be joined to the outer casing 21, and then the inner bag 22 may be peeled off from the outer casing 21 as the contents are discharged.

The main body 2 includes the outer casing 21 and the inner bag 22 as described above, and the outer casing 21 is made thicker than the inner bag 22 to improve the shape recovery property.

The casing 21 is made of, for example, low-density polyethylene, linear low-density polyethylene, and polyethylene, polypropylene, ethylene-propylene copolymer, and mixtures thereof, and the like. The casing 21 has a single-layer or multi-layer structure, and preferably contains a lubricant in at least one of the innermost layer and the outermost layer. When the casing 21 has a single-layer structure, the single layer is the innermost layer and the outermost layer, and the layer may contain a lubricant. When the outer shell 21 has a two-layer structure, the layer on the inner surface of the container is the innermost layer, and the layer on the outer surface of the container is the outermost layer, and at least one of them may contain a lubricant. When the outer shell 21 is constituted by three or more layers, the layer on the innermost side of the container is the innermost layer, and the layer on the outermost side of the container is the outermost layer.

The innermost layer of the outer casing 21 is a layer in contact with the inner bag 22 , and the releasability between the outer casing 21 and the inner bag 22 can be improved by containing a lubricant in the innermost layer of the outer casing 21 . The outermost layer of the casing 21 is a layer that is in contact with the mold during blow molding, and by including a lubricant in the outermost layer of the casing 21, the mold releasability can be improved.

One or both of the innermost layer and the outermost layer of the outer shell 21 may be formed of a random copolymer between propylene and other monomers. Thereby, the shape recovery property, transparency, and heat resistance of the case 21 as a case can be improved.

The random copolymer is a copolymer having a monomer content other than propylene of less than 50 mol %, preferably 5 to 35 mol %. As a monomer to be copolymerized with propylene, it is only necessary to improve the impact resistance of the random copolymer compared with the homopolymer of polypropylene, and ethylene is particularly preferred. In the case of a random copolymer of propylene and ethylene, the content of ethylene is preferably 5 to 30 mol%. The weight average molecular weight of the random copolymer is preferably 100,000 to 500,000, and more preferably 100,000 to 300,000.

The tensile modulus of elasticity of the random copolymer is preferably 400 to 1600 MPa, and more preferably 1000 to 1600 MPa. When the tensile elastic modulus is in this range, the shape recovery performance is particularly good.

When the container is too hard, the feeling of use of the container becomes poor, and therefore, the random copolymer may be mixed with a soft material such as linear low density polyethylene to constitute the outer shell 21 . However, it is preferable that the material to be mixed with the random copolymer is less than 50% by weight with respect to the entire mixture so as not to significantly impair the effective performance of the random copolymer. For example, the shell 21 may be formed by mixing a random copolymer and a linear low density polyethylene in a weight ratio of 85:15.

The inner bag 22 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the EVOH layer container inner surface side, and an adhesive layer provided between the EVOH layer and the inner surface layer. By providing the EVOH layer, the gas barrier properties and the releasability from the case 21 can be improved.

The EVOH layer is a layer composed of ethylene-vinyl alcohol copolymer (EVOH) resin, which can be prepared by hydrolysis of ethylene and ethyl acetate copolymer. The ethylene content of the EVOH resin is, for example, 25 to 50 mol %, and preferably 32 mol % or less from the viewpoint of oxygen barrier properties. The lower limit ratio of the ethylene content is particularly limited, and as the ethylene content decreases, the flexibility of the EVOH layer tends to decrease, so it is preferably 25 mol % or more. Furthermore, the EVOH layer preferably contains an oxygen absorber. When the EVOH layer contains an oxygen absorber, the oxygen barrier properties of the EVOH layer can be further improved.

The melting point of the EVOH resin is preferably higher than the melting point of the random copolymer constituting the outer shell 21 . The outside air introduction hole 52 is preferably formed in the casing 21 by a heating type drilling device. By setting the melting point of the EVOH resin to be higher than the melting point of the random copolymer, when the outside air introduction hole 52 is formed in the casing 21, it is possible to play a role. The holes are prevented from reaching the inner pocket 22 . From this viewpoint, the difference between (melting point of EVOH) and (melting point of random copolymer layer) is preferably large, and it is preferably 15°C or higher, particularly preferably 30°C or higher. The difference between the melting points is, for example, 5 to 50°C.

The inner surface layer is a layer that is in contact with the contents of the double-layered container 1, and is preferably made of polyolefins such as low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, and mixtures thereof. consist of, or consist of, low density polyethylene or linear low density polyethylene. The tensile elastic modulus of the resin constituting the inner surface layer is preferably 50 to 300 MPa, and more preferably 70 to 200 MPa. When the tensile elastic modulus is in this range, the inner face layer is particularly soft.

The adhesive layer is a layer having the function of bonding the EVOH layer and the inner surface layer, and may be, for example, an acid-modified polyolefin (for example, maleic anhydride acid-modified polyolefin) in which a carboxyl group is added to the polyolefin as described above. ethylene), and ethylene ethyl acetate copolymer (EVA). An example of an adhesive layer is low density polyethylene or a blend of linear low density polyethylene and acid modified polyethylene.

In addition, it should be noted that the main body 2 has a flat shape as a whole. This structure can have the advantageous effects that the user can easily press and the content can be easily squeezed out.

1.2 Check valve 6

Hereinafter, the outside air introduction hole 52 and the check valve 6 will be described. FIG. 23 is a view showing an end surface constituting the internal structure of the double-layered container 1 according to the first embodiment. The area surrounded by a dotted line in FIG. 23 has design features. FIG. 24 shows the detailed structure of the check valve 6 .

As shown in FIG. 23 , the outside air introduction hole 52 is provided in a specific region 51 on the bottom side of the casing 21 . Here, the bottom side refers to the side away from the mouth 3 when the double-layer container 1 is divided into two in the height direction. In the present embodiment, the specific area 51 is a part of the side surface of the casing 21 . Specifically, the specific region 51 is located in the recessed portion 5 of the housing 21 .

The outside air introduction hole 52 is configured to fit the check valve 6 . The check valve 6 can be, for example, a ball valve. The check valve 6 can introduce air into the intermediate space 25 inside the outer casing 21 and outside the inner bag 22 after the contents flow out, so that the shape of the outer casing 21 can be restored to its original state. That is, the intermediate space 25 and the external space communicate with each other through the outside air introduction hole 52 .

Thereby, the outside air introduction hole 52 is provided in the specific region 51 on the bottom side of the casing 21 , and after the contents are taken out, the outside air is introduced into the intermediate space 25 from above to below through the outside air introduction hole 52 . That is, compared with the related art, the inner bag 22 can be peeled off from the outer shell 21 more efficiently.

Next, the check valve 6 fitted in the outside air introduction hole 52 will be described. As shown in FIGS. 24A to 24G , the check valve 6 is a ball valve composed of a cylindrical body 60 and a ball 69 . The cylindrical body 60 has a hollow portion 6s provided to communicate with the external space and the intermediate space 25 . The ball 69 is accommodated in the hollow portion 6s so as to be movable in a specific direction. Specifically, the diameter of the cross-section of the hollow portion 6s is slightly larger than that of the corresponding cross-section of the ball 69, and the ball 69 has a shape that can move freely in a specific direction (here, the vertical direction of the paper).

The cylindrical body 60 has a shaft portion 61 arranged in the outside air introduction hole 52 , a locking portion 62 provided on the outer space side of the shaft portion 61 and preventing the cylindrical body 60 from being inserted into the intermediate space 25 , and an intermediate space provided in the shaft portion 61 . 25 side and the enlarged diameter portion 63 that prevents the cylindrical body 60 from being pulled out from the outside of the main body 2 . The shaft portion 61 is configured to have a tapered shape (tapered shape) toward the intermediate space 25 side. The cylindrical body 60 is attached to the main body 2 when the outer peripheral surface of the shaft portion 61 is in close contact with the edge of the outside air introduction hole 52 .

A stopper 65 for engaging the ball 69 when the ball 69 moves from the intermediate space 25 side to the outer space side is provided on the surface 66 surrounding the hollow portion 6s. The stopper portion 65 is constituted by an annular protrusion, and when the ball 69 comes into contact with the stopper portion 65, the flow of air passing through the cavity portion 6s is blocked.

The front end of the cylindrical body 60 is a flat surface 641 , and the flat surface 641 is provided with an opening 64 communicating with the cavity 6s , and has a plurality of slits 642 extending radially from the opening 64 .

As shown in FIG. 24F , when the check valve 6 is inserted into the outside air introduction hole 52 from the enlarged diameter portion 63 side, and the locking portion 62 is pressed to a position in contact with the outer surface of the housing 21 , the outer circumference of the shaft portion 61 is The check valve 6 supports the housing 21 in a state in which the surface is in close contact with the edge of the outside air introduction hole 52 . When the casing 21 is compressed with the air entering the intermediate space 25 , the air in the intermediate space 25 enters the cavity 6s through the opening 64 and pushes the ball 69 upward to abut against the stopper 65 . When the ball 69 comes into contact with the stopper portion 65, the air flow through the hollow portion 6s is blocked.

When the outer casing 21 is further compressed in this state, the pressure in the intermediate space 25 increases, and as a result, the inner bag 22 is compressed, and the contents are discharged from the storage space 26 in the inner bag 22 . When the compressive force on the casing 21 is released, the casing 21 will return to its original state by virtue of its own elasticity. As shown in FIG. 24G , as the housing 21 returns to its original state, the pressure in the intermediate space 25 is reduced, and a force F is applied to the ball 69 toward the inside of the container. As a result, the balls 69 move toward the bottom surface of the cavity 6s to be in a state as shown in FIG. 24F .

In addition, the check valve 6 is the above-mentioned ball valve, this is only an example, and this invention is not limited to this. Any structure may be used as long as it is a structure capable of introducing outside air into the intermediate space 25 and preventing backflow.

1.3 Mouth 3 and cover 30

In the main body 2, the mouth part 3 is comprised so that the cover 30 as a cover member may be attached. A male screw portion is provided on the mouth portion 3, and a cap 30 having a female screw is attached to the male screw portion. The cover 30 is configured to use its top surface 31 as a grounding surface, and can be placed upside down. Of course, the bottom surface 23 of the double container 1 may be placed upright as a mounting surface. In order to be able to stand upside down stably, in the double-layered container 1, if the area of the top surface 31 of the lid 30 is S1 and the area of the mouth 3 is S2, the following conditions are preferably satisfied: S1≥1.5×S2.

Specifically, when S1=k×S2, k=1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2 , 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.7 , 5.8, 5.9, 6, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, 7, 7.1, 7.2, 7.3, 7.4, 7.5, 7.6, 7.7, 7.8, 7.9, 8, 8.1, 8.2 , 8.3, 8.4, 8.5, 8.6, 8.7, 8.8, 8.9, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, also It can be a range between any two values shown here. Since it can be placed in an upside-down state, the residual rate can be suppressed even when viscous substances such as jam, mayonnaise, or ketchup are stored as storage objects.

Referring again to FIG. 23 , the specific region 51 is configured to have an inclined angle with respect to the opening surface 53 defining the recessed portion 5 . When the inclination angle is θ, in the double container 1, the inclination angle θ may be 5 degrees or more and 45 degrees or less. Specifically, for example: θ=5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 , 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45 degrees, also as shown here A range between any 2 numbers.

With such an inclination angle θ, the outside air can be introduced into the intermediate space 25 more smoothly from above to below. That is, this configuration helps to effectively peel the inner bag 22 from the outer shell 21 .

The wall 54 defining the recessed portion 5 is configured not to be perpendicular to the opening surface 53 . Assuming that the included angle is φ, the angle φ in the double-layer container 1 can be 5 degrees or more and 75 degrees or less. Specifically, for example: φ=5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 , 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50 , 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75 degree, and may be a range between any two numerical values shown here. Further, it is preferable to satisfy: φ≧θ.

With such an angle φ, when the inner bag 22 is peeled off from the outer casing 21, the inner bag 22 can be prevented from being caught in the concave portion 5 (convex when viewed from the inner bag 22 side). That is, this configuration contributes to effectively peeling the inner bag 22 from the outer shell 21 .

The double-layered container 1 further includes a groove portion 55 . Specifically, the groove portion 55 is provided at a position closer to the bottom side than the specific region 51 on the housing 21 . By providing such a groove portion 55, a fixing jig (not shown) which can be accommodated in the groove portion 55 and has a convex portion is used as a positioning reference when the external air introduction hole 52 is drilled with a drill in the licensing process. However, the depth of the groove portion 55 is preferably smaller than the depth of the recessed portion 5 . When a shrink film made of marking the contents or the like is pasted on the outside of the double-layered container 1, the dents are not conspicuous, so the appearance is beautiful.

2. The second embodiment according to the second viewpoint

In this section, the double-layered container 1 according to the second embodiment will be described. FIG. 25 is a perspective view of the double container 1 according to the second embodiment. FIG. 26 shows the state in which the cover 30 is removed from the state of FIG. 25 . FIG. 27 shows a front view and a rear view of the double container 1 according to the second embodiment. FIG. 28 shows a state in which the cover 30 is removed from the state shown in FIG. 27 . FIG. 29 shows a left side view and a right side view of the double container 1 according to the second embodiment. FIG. 30 shows a state in which the cover 30 is removed from the state in FIG. 29 . FIG. 31 shows a top view and a bottom view of the double container 1 according to the second embodiment. FIG. 32 shows the state in which the cover 30 is removed from the state shown in FIG. 31 . FIG. 33 is an end view showing the internal structure of the double container 1 according to the second embodiment. It should be noted that the area surrounded by dotted lines in FIG. 33 has design features.

The double container 1 according to the second embodiment has the same basic configuration as the double container 1 according to the first embodiment, and as shown in FIGS. 25 to 33 , the difference lies in the shape of the main body 2 . The bottom surface 23 (upper surface of the paper) of the double container 1 in the second embodiment has a circular shape, and cannot stand when the bottom surface 23 is used as a placing surface. Therefore, the second embodiment is configured on the premise that the top surface 31 of the cover 30 is used as the placement surface.

In the double-layered container 1 according to the second embodiment, the extended surface of the specific region 51 is configured to intersect the cut embryo 231 of the bottom surface 23 . With this structure, the inner bag 22 tends to shrink with the cut embryo 231 as a fulcrum, thereby having an advantageous effect that the content does not remain on the bottom side.

In the second embodiment, by providing the outside air introduction hole 52 in the specific region 51 on the bottom side of the casing 21, the outside air is immediately introduced into the intermediate space 25 through the outside air introduction hole 52 from above to the bottom after taking out the contents. Inside. That is, compared with the related art, the inner bag 22 can be peeled off from the outer shell 21 more efficiently.

3. Conclusion

As described above, according to the embodiments described so far, it is possible to realize a double-layered container that can more efficiently peel off the inner bag from the outer casing after taking out the contents. It can also be implemented in various ways as described below. In the double-layered container, the mouth portion is configured so that a lid can be attached, and the lid is configured so that the top surface thereof serves as a grounding surface and can be placed upside down. In the double-layer container, the area of the top surface of the lid is S1, and the area of the mouth is S2, which satisfy the following relationship: S1≧1.5×S2. In the double-layered container, the specific area is a part of the side of the outer shell. In the double-layered container, the specific region is located in a recessed portion of the casing, and is configured to have an inclination angle with respect to an opening surface defining the recessed portion. In the double-layered container, the inclination angle is 5 degrees or more and 45 degrees or less. In the double-layered container, the wall defining the recess is configured not to be perpendicular to the opening surface. The double-layered container further includes a groove portion provided on the bottom side of the specific region of the casing. In the double-layered container, the depth of the groove portion is shallower than the depth of the recessed portion. In the double layer container, the check valve is a ball valve. Of course, the present invention is not limited to this.

(3rd point of view)

1. The first embodiment of the third viewpoint

As shown in FIG. 34 , the double container 201 according to the first embodiment of the present invention includes a container body 202 . As shown in FIG. 36A, the container body 202 has an outer shell 203 and an inner bag 204, and the inner bag 204 shrinks as the content decreases.

As shown in FIG. 34 , the container body 202 includes a mouth portion 205 , a trunk portion 206 , and a bottom portion 207 . The mouth portion 205 includes an engaging portion 205a to which a pump (not shown) can be attached. The engaging portion 205a is a male screw portion in the case of a screw-type pump, and is an annular protrusion protruding in the circumferential direction in the case of a push-type pump. The mouth portion 205 is provided so as to extend from the upper end portion 206a of the body portion 206 . The mouth portion 205 is cylindrical. The outer diameter of the body portion 206 is larger than that of the mouth portion 205 (in this specification, when the cross section is not circular, the "outer diameter" refers to the diameter of a circumscribed circle).

The body portion 206 is cylindrical, and the bottom portion 207 is provided at the lower end of the body portion 206 so as to close the lower end of the body portion 206 . The bottom part 207 is provided with the center recessed part 207a provided in the center of the bottom part 207, and the peripheral part 207b surrounding the center recessed part 207a.

As shown in FIG. 35A , a locking portion 207a1, an external air introduction hole 207a2, an annular convex portion 207a3, and a positioning concave portion 207a4 are provided in the central concave portion 207a. As shown in FIG. 36A , the locking portion 207a1 is configured such that the locking projection 204a provided in the inner bag 204 is inserted into the insertion hole 203a provided in the outer case 203 . The locking portion 207a1 can prevent the inner bag 204 from being detached from the outer case 203 . The outside air introduction hole 207a2 is a through hole penetrating the outer casing 203. As the inner bag 204 shrinks, the outside air can be introduced into the intermediate space between the outer casing 203 and the inner bag 204 through the outside air introduction hole 207a2. The locking portion 207a1 and the outside air introduction hole 207a2 are arranged in the annular convex portion 207a3. The positioning recess 207a4 is used to position the container body 202 in the circumferential direction when the container body 202 performs a process such as printing.

The ground part 207b1 and the peripheral recessed part 207b2 are provided in the peripheral part 207b. The grounding portion 207b1 is a portion that comes into contact with the mounting surface on which the container body 202 is placed when the container body 202 is made to stand. If the entire peripheral edge portion 207b is used as the ground portion 207b1, when the container body 202 is made to stand, the central concave portion 207a forms a closed space between the container body 202 and the mounting surface, and external air may be introduced through the external air introduction hole 207a2. hindered situation. Therefore, the peripheral recessed portion 207b2 is provided as a gas passage to prevent the formation of a closed space in the central recessed portion 207a.

When the contents in the inner bag 204 are discharged by the pump mounted on the mouth portion 205 , the inner bag 204 is contracted and separated from the outer casing 203 . At this time, the outside air can be introduced into the space between the inner bag 204 and the outer case 203 through the outside air introduction hole 207a2. As shown in FIG. 36A , since the radius of curvature of the peripheral edge portion 207b is small, the inner bag 204 is not easily separated from the outer casing 203 at the peripheral edge portion 207b, and it is difficult to form a gas passage through which the external air introduced from the external air introduction hole 207a2 flows. Therefore, it is not easy to introduce external air into the body portion 206 . In this case, there occurs a problem that the outer shell 203 shrinks together with the inner bag 204 along with the content reduction. In this embodiment, the spacer member 209 is arranged between the outer case 203 and the inner bag 204 . In the present embodiment, as the spacer member 209, a protrusion 203b protruding from the outer case 203 toward the inner bag 204 is provided. After the spacer member 209 is installed, a gap 208 is formed between the outer casing 203 and the inner bag 204 at the position adjacent to the spacer member 209. The gap 208 can form a gas passage connecting the body portion 206 and the bottom portion 207, and is introduced from the outside air introduction hole 207a2 The outside air is easily introduced into the body portion 206 through the peripheral edge portion 207b. The spacer members 209 are arranged radially across the bottom portion 207 and the body portion 206 , and this structure facilitates the formation of gas passages across the bottom portion 207 and the body portion 206 .

As shown in FIGS. 37 to 39 , the container body 202 can cover the inner preform 214 and the outer preform with the inner preform 214 constituting the inner bag 204 covering the outer preform 213 constituting the outer shell 203 . 213 is heated and formed by biaxial stretch blow molding.

As shown in FIG. 37, the inner preform 214 has a bottomed cylindrical shape, and includes a mouth portion 214a, a body portion 214b, and a bottom portion 214c. The flange 214a1 is provided in the opening end of the mouth part 214a. A positioning pin 214c1 is provided on the bottom 214c.

As shown in FIG. 37, the outer preform 213 has a bottomed cylindrical shape, and includes a mouth portion 213a, a body portion 213b, and a bottom portion 213c. As shown in FIG. 38 , radially arranged projections 213c1 are provided on the inner surface of the bottom portion 213c of the outer preform 213 . A positioning hole 213c2 and an outside air introduction hole 213c3 are provided in the bottom portion 213c. As shown in FIG. 39B, an annular convex portion 213c4 is provided on the outer surface of the bottom portion 213c. The positioning hole 213c2 and the outside air introduction hole 213c3 are arranged in a region inside the annular convex portion 213c4. The outer preform 213 is sized to be inserted into the inner preform 214 .

The inner preform 214 and the outer preform 213 can be formed by blow molding or injection molding of thermoplastic resins such as polyester (eg, PET) and polyolefin (eg, polypropylene, polyethylene). In one example, the inner preform 214 may be formed by blow molding of polypropylene and the outer preform 213 may be formed by injection molding of PET. By making the materials of the inner preform 214 and the outer preform 213 different, it is possible to suppress fusion of each other during blow molding. In addition, when the outer preform 213 is formed using injection molding, the outside air introduction hole 213c3 can be formed at the time of injection molding, so that time spent on post-processing can be saved.

2. Biaxial stretch blow molding

Biaxial stretch blow molding can be performed by the following method.

First, as shown in FIG. 39 , the outer preform 213 is overlaid on the inner preform 214 (in other words, the inner preform 214 is inserted into the outer preform 213 ) to form the assembly 215 . At this time, the flange 214a1 is in contact with the opening end of the mouth portion 213a, and the positioning pin 214c1 is inserted into the positioning hole 213c2. Thereby, the inner preform 214 and the outer preform 213 are positioned relative to each other. In this state, the mouth portion 214a and the mouth portion 213a face each other, and the body portion 214b and the body portion 213b face each other.

Then, the softening assembly 215 is heated.

Subsequently, the assembly 215 is placed in a mold for blow molding, and air is blown into the inner preform 214 in a state in which the mouth 213a and the annular protrusion 213c4 are supported by a jig to expand the assembly 215 and contact the mold. The inner face of the cavity fits snugly. At this time, the assembly 215 can be restrained from shaking in the mold by pressing a support rod (not shown) against the inner bottom surface of the inner preform 214 . In addition, the inner bottom surface of the inner preform 214 can be provided with a concave portion for engaging the support rod, so that the support rod can be easily fixed in the inner preform 214 .

By blow molding, the assembly 215 expands to the container body 202 as shown in FIGS. 34-36 . The mouth portions 213a and 214a serve as the mouth portion 205 , the body portions 213b and 214b serve as the body portion 206 , and the bottom portions 213c and 214c serve as the bottom portion 207 . The protrusion 213c1, the annular convex portion 213c4, and the outside air introduction hole 213c3 become the protrusion 203b, the annular convex portion 207a3, and the outside air introduction hole 207a2, respectively. During blow molding, the mouth portions 213a, 214a, the annular convex portion 213c4, and the region inside thereof are hardly deformed, and other portions are mainly deformed. Since the outside air introduction hole 213c3 is arranged in the inner region of the annular convex portion 213c4, it can be suppressed from being blocked due to deformation during blow molding. The flange 214a1 constitutes a flange 204b that covers the opening end of the mouth portion 205 of the container body 202 as shown in FIG. 34A.

After blow molding, the positioning hole 213c2 becomes the insertion hole 203a as shown in FIG. 36A, and the positioning pin 214c1 is inserted into the insertion hole 203a. Subsequently, the positioning pin 214c1 is deformed (ie, squashed or bent) to form the locking protrusion 204a as shown in FIG. 36A. Thereby, the locking part 207a1 of the container main body 202 is formed.

3. Details of biaxial stretch blow molding

The above-mentioned biaxial stretch blow molding can be performed using, for example, the mold unit 220 shown in FIGS. 40 to 42 . The die unit 220 includes a mouth supporting die 221 , a bottom supporting die 222 , and forming dies 223 and 224 .

The mouth portion supporting mold 221 is configured to support the mouth portion 213 a of the outer preform 213 . An insertion hole 221a is provided in the mouth support mold 221, and a support rod 225 is inserted into the insertion hole 221a. The support rod 225 can be extended and retracted by a drive mechanism (not shown). The bottom support mold 222 is driven by the drive mechanism 222c and is configured to be movable in the longitudinal extension direction (the vertical direction in FIG. 40 ). The forming molds 223 and 224 are openable and closable, and have cavity surfaces 223a and 224a, respectively. The cavity surfaces 223a and 224a are closed together to form a cavity of a shape corresponding to the outer shape of the container body 202 .

This method includes a preform heating step, a bottom support step, an elongation step, and a blow molding step.

<Preform heating process>

In the preform heating step, the assembly 215 composed of the inward preform 214 covering the outer preform 213 is attached to the mouth supporting mold 221 as shown in FIG. 40 , and the assembly 215 is heated in this state to make its softened. The heating of the unit 215 may be performed in a state where the unit 215 is arranged between the forming dies 223 and 224 , or may be performed outside the space between the forming dies 223 and 224 . Further, before the preform heating step, the front end of the support rod 225 may be brought into contact with the inner bottom surface of the inner preform 214 . As a result, the softened assembly 215 can be suppressed from shaking.

<Bottom support process>

In the bottom support process, as shown in FIG. 41 , the bottom support mold 222 is moved toward the bottom portion 213c of the outer preform 213, and the bottom support mold 222 supports the bottom portion 213c of the outer preform 213. The bottom support mold 222 is provided with a concave portion 222a that can accommodate the annular convex portion 213c4, and the bottom support mold 222 preferably supports the bottom portion 213c such that the annular convex portion 213c4 is accommodated in the concave portion 222a. This can prevent the annular convex portion 213c4 and the inner region from extending during the blow molding process. The concave portion 222a is preferably annular. The bottom support mold 222 includes a recess 222b that can accommodate the positioning pin 214c1, and preferably supports the bottom 213c so that the positioning pin 214c1 is accommodated in the recess 222b. In this way, interference of the positioning pins 214c1 with the bottom support mold 222 can be suppressed. Although Fig. 41 shows the closed state of the forming dies 223 and 224, the forming dies 223 and 224 only need to be closed at any point before the blow molding process, and may be closed after the longitudinal stretching process.

<Vertical stretching process>

In the longitudinal extension process, as shown in FIGS. 41 to 42 , the assembly 215 can be extended in the longitudinal direction (up and down direction in FIG. 42 ) by extending the support rod 225 against the inner bottom surface of the inner preform 214 . extend. At this time, it is preferable to retract the bottom support mold 222 in synchronization with the extension of the support rod 225 . The assembly 215 can thus be stabilized and extended. It should be noted that the vertical stretching process may be performed without using the bottom supporting mold 222 to support the bottom part 213c, or the bottom supporting process may be performed after the vertical stretching process.

＜Blow molding process＞

In the blow molding process, the component 215 can be extended laterally (ie, expanded) by blowing air into the inner preform 214 in the state shown in FIG. 42, and the cavity surfaces 223a, 224a can be given shapes . The blowing of air may be performed through the air passage 226 between the mouth support die 221 and the support rod 225 , or may be performed by providing an air passage in the support rod 225 and blowing air from the side surface of the support rod 225 .

In the present embodiment, air is blown into the bottom portion 213c of the outer preform 213 while being supported by the bottom support mold 222, so that the bottom portion 213c of the outer preform 213 can be suppressed from extending.

In addition, the blow molding process may be performed simultaneously with the longitudinal stretching process. That is, air may be blown into the inner preform 214 while extending the assembly 215 longitudinally. In addition, it is also possible to omit the longitudinally extending process, without extending the assembly 215 longitudinally after the bottom supporting process, and only blowing in air.

4. Other implementations

In the above-mentioned embodiment, the spacer members 209 are provided in a radial shape, but the spacer members 209 may be of other shapes. For example, the spacer members 209 may be configured as non-continuous circles. In this case, a gas passage is formed at the position of the circular notch. It is preferable that a plurality of discontinuous circles are arranged concentrically. As shown in FIG. 43, such a spacer member 209 may be formed by using an outer preform 213 having a non-continuously circular protrusion 213c1.

In the above-mentioned embodiment, the protrusion 203b protruding from the outer shell 203 to the inner bag 204 is formed by providing the protrusion 213c1 on the outer preform 213. However, as shown in FIGS. 44 to 45, the inner preform 214 may be The bottom 214c is provided with protrusions 214c2 (eg, radial protrusions as shown in FIG. 44 or discontinuous circular protrusions as shown in FIG. 45 ) to form protrusions (spacers) protruding from the inner bag 204 to the outer case 203 .

• The spacer member 209 may be composed of other members. The spacer member 209 between the outer shell 203 and the inner bag 204 can be arranged by blow molding in a state where a member serving as the spacer member is arranged between the inner preform 214 and the outer preform 213 .

5. Inventions of other viewpoints

When the inner preform 214 is a blow-molded body (specifically, a direct blow-molded body), as shown in FIG. 46 , a cut portion 214h is formed where the bottom 214g of the inner preform 214 blocks the parison. Since the strength of the cut embryo portion 214h is relatively weak, when the portion near the cut embryo portion 214h is strongly extended during biaxial stretch blow molding, the cut embryo portion 214h may be cracked.

In one example, as shown in FIG. 46 , the inner preform 214 is a multi-layer structure including an innermost layer 214d, a gas barrier layer (eg, an EVOH layer) 14e, and an outermost layer 214f in this order from the inside. The innermost layer 214d and the outermost layer 214f may be composed of polyolefins (eg, polyethylene, polypropylene), PET, and the like. At the green cut portion 214h, even if the opposing gas barrier layers 214e1 and 214e2 are connected or separated from each other, the gap G between them becomes very small. During biaxial stretch blow molding, the gas barrier layer 214e may be cracked or the gap G may become larger when the portion near the cut embryo portion 214h is strongly stretched, resulting in problems such as poor gas barrier properties.

The above problems are described in "2. Biaxial stretch blow molding" and "3. Details of biaxial stretch blow molding". Assembly 215 expansion can be addressed. Since the cut portion 214h is disposed at a position opposite to the bottom portion 213c of the outer preform 213, when the bottom portion 213c is restrained from extending, the extension of the portion near the cut portion 214h can be suppressed, thereby solving the above problem.

In "2. Biaxial stretch blow molding", by providing the annular convex portion 213c4 in the bottom portion 213c of the outer preform 213, the rigidity of the bottom portion 213c can be increased and the bottom portion 213c can be suppressed from extending. The structure provided in order to improve the rigidity of the bottom part 213c may be a reinforcement structure other than the annular convex part 213c4.

In "3. Details of Biaxial Stretching Blow Molding", the bottom part 213c of the outer preform 213 is supported by the bottom support mold 222 and the blow molding process is performed in this state, so that the extension of the bottom part 213c is suppressed. In the above description, although the annular convex portion 213c4 is accommodated in the concave portion 222a, even if the annular convex portion 213c4 is not included in the bottom portion 213c, the bottom portion can be used by supporting the bottom portion 213c by the bottom supporting mold 222. The bottom support mold 222 is rubbed against the bottom support mold 222 to restrain the bottom portion 213c from extending.

Taking the above into consideration, the present invention provides a method for manufacturing a double-layered container, which includes a blow molding process in which the inner preform is covered with the outer preform. The preform and the outer preform are heated to soften, and in this state, air is blown into the inner preform, the inner preform is a blow-molded body, and the blowing is performed. The plastic forming step is performed in a state where the extension of the bottom of the outer preform is suppressed.

Preferably, the outer preform is provided with a reinforcing structure that suppresses extension of the bottom of the outer preform.

Preferably, the reinforcing structure is an annular protrusion provided on the bottom of the outer preform.

Preferably, the blow molding step is performed by supporting the bottom of the outer preform with a bottom supporting mold in a state where the bottom is restrained from extending.

In addition, in another viewpoint, there is provided a method for producing a double-layered container including a blow molding step of heating the inner preform in a state in which the inner preform covers the outer preform. The preform and the outer preform are blown into the inner preform in a softened state, the inner preform is a blow-molded body, and the outer preform is in the The bottom has an annular convex portion.

In addition, in the invention of another viewpoint, the position of an external air introduction hole is not limited, and may be provided in any of the mouth part 205, the trunk part 206, and the bottom part 207 of the container main body 202. Furthermore, the spacer member 209 for forming a gap between the outer shell 203 and the inner bag 204 is not necessary.

【Example】

Hereinafter, examples related to the first viewpoint will be shown.

1. Manufacture of container body 102

<Example 1>

The inner container 104 having the configuration shown in FIG. 12 was manufactured using direct blow molding and the layer configuration shown in Table 3. The wall thickness at the center in the height direction of the housing portion 107 of the inner container 104 is 1500 μm.

【table 3】

The layers in Table 3 were fabricated from the following materials.

LDPE/LLDPE layer: mixed resin with a mass ratio of 50:50 of LDPE (melting point 110°C, manufactured by Asahi Kasei Co., Ltd., model: F2206) and LLDPE (melting point 120°C, manufactured by Nippon Polyethylene Co., Ltd., model: NF325N).

PP layer: Polypropylene (made by Sumitomo Chemical Co., Ltd., model number: FH3315)

EVOH layer: EVOH (product made in Mitsubishi Chemical Corporation, a model number: SF7503B)

Acid-modified PE/LDPE layer: Mixed resin in which the mass ratio of acid-modified polyethylene (manufactured by Mitsubishi Chemical Corporation, model: L522) and LDPE (melting point 110°C, manufactured by Asahi Kasei, model: F2206) is 50:50

LDPE layer: LDPE (manufactured by Asahi Kasei Corporation, model number: F2206)

Next, the container body 102 is manufactured by forming the outer shell 105 by injection molding at a resin temperature of 220° C. so as to cover the outer peripheral surface and the bottom surface of the inner container 104 according to the method described in the first embodiment. For injection molding, an ethylene-(meth)acrylic acid copolymer ionomer resin (manufactured by Dow-Mitsui Polychemicals, model: PC2000, melting point 80°C) was used.

<Example 2>

As the outermost layer 113c1 of the outer shell 113, the container body 102 was produced by the same method as in Example 1, except that the LDPE/ADH layer was used instead of the LDPE/LLDPE layer.

The LDPE/ADH layer is a mixed resin with a mass ratio of 50:50 of LDPE (melting point 110°C, manufactured by Asahi Kasei Co., Ltd., model: F2206) and an adhesive resin (melting point 120°C, manufactured by Mitsubishi Chemical Corporation, model: L522). The melting point of the resin was 115°C.

<Comparative Example 1>

The container body 102 was produced by the same method as in Example 1, except that a PP layer was used as the outermost layer 113c1 of the shell 113 instead of the LDPE/LLDPE layer.

The PP layer is composed of polypropylene (manufactured by Sumitomo Chemical Co., Ltd., model number: FH3315), and has a melting point of 140°C.

2. Evaluation

The following evaluations were performed with respect to the above-mentioned Examples and Comparative Examples, and Table 4 shows the results. As shown in Table 4, in the Examples, the deformability and the adhesiveness were good. On the other hand, the deformability and adhesiveness of the comparative example were inferior.

【Table 4】

Table 4 Example 1 Example 2 Comparative Example 1 deformability ○ ○ × Adhesion △ ○ ×

<Deformability>

Whether or not the inner container 104 in the outer casing 105 was deformed was visually confirmed and evaluated according to the following criteria.

○: Not deformed

×: Deformation

<Adhesion>

The container main body 102 was longitudinally cut to confirm whether the inner container 104 could be peeled off from the outer casing 105 by hand, and evaluated according to the following criteria.

○: Does not peel off even when pulled hard by hand

△: Can be peeled off after being pulled hard by hand

×: Can be easily peeled off by hand

(Symbol Description)

1: Double container, 2: Main body, 3: Mouth, 5: Recess, 6: Check valve, 6s: Hole, 21: Shell, 22: Inner bag, 23: Bottom, 25: Intermediate space, 26: accommodating space, 30: cover, 31: top surface, 51: specific area, 52: outside air introduction hole, 53: opening surface, 54: wall, 55: groove portion, 60: cylindrical body, 61: shaft portion, 62 : Locking part, 63: Enlarged diameter part, 64: Opening part, 65: Stopping part, 66: Surface, 69: Ball, 101: Storage container, 102: Container body, 103: Opening member, 104: Inner container , 104a: outer peripheral surface, 104b: bottom surface, 104c1: outermost layer, 104c2: adjacent layer, 104c3: other layer, 105: outer layer, 105a: cylindrical portion, 105b: bottom portion, 105c: ventilation portion, 107: housing portion, 107a : body part, 107b: bottom part, 107c: pinch part, 108: mouth part, 108a: engaging part, 108b: flat part, 109: mold, 109a: cavity, 109b: gate, 110: fixing part, 110a: opening part, 111: support rod, 112: pump, 112a: main body part, 112a1: cylinder part, 112a2: cylinder part, 112a3: upper wall part, 112b: piston part, 112c: nozzle, 112d: tube, 113: housing, 113c1 : Outermost layer, 113c2: Adjacent layer, 113c3: Other layer, 114: Inner bag, 114c1: Outermost layer, 114c2: Adhesive layer, 114c3: Inner surface layer, 115: Outside air inlet, 201: Double container , 202: container body, 203: outer shell, 203a: insertion hole, 203b: protrusion, 204: inner bag, 204a: locking protrusion, 204b: flange, 205: mouth, 205a: engaging portion, 206: body portion , 206a: upper end portion, 207: bottom portion, 207a: central concave portion, 207a1: locking portion, 207a2: external air introduction hole, 207a3: annular convex portion, 207a4: positioning concave portion, 207b: peripheral edge portion, 207b1: ground portion, 207b2: Peripheral recess, 208: Clearance, 209: Spacer, 213: Outer preform, 213a: Mouth, 213b: Body, 213c: Bottom, 213c1: Protrusion, 213c2: Positioning hole, 213c3: Outside air introduction hole , 213c4: annular protrusion, 214: inner preform, 214a: mouth, 214a1: flange, 214b: body, 214c: bottom, 214c1: positioning pin, 214c2: protrusion, 214d: innermost layer, 214e: Gas barrier, 214e1: Gas barrier, 214e2: Gas barrier, 214f: Outermost layer, 214g: Bottom, 214h: Cut embryo, 215: Assembly, 220: Die unit, 221: Mouth support die, 221a: Insertion hole, 222: Bottom support mold, 222a: Recess, 222b: Recess, 222c: Drive mechanism, 223: Forming die, 223a: Cavity surface, 224: Forming die, 224a: Cavity surface, 225: Support rod, 226: Air passage, 231: Cut embryo, 641: Flat surface, 642 : slit portion, A: area, B: area, C: area, F: force, G: gap, Tpm: melting peak temperature, θ: inclination angle, φ: angle.

Claims (30)

1. A storage container includes a container body integrally formed with an outer cover so as to cover an outer peripheral surface of an inner container,

the outer casing is an injection molded body,

the inner container is provided with an outermost layer and an adjacent layer adjacent to the outermost layer,

the outermost layer resin constituting the outermost layer has a lower melting point than the adjacent layer resin constituting the adjacent layer.

2. The containment vessel according to claim 1,

the difference between the melting point of the outermost layer resin and the melting point of the adjacent layer resin is 5 ℃ or more.

3. The containment vessel according to claim 1 or 2,

the outermost layer has a wall thickness of 10% or more relative to the wall thickness of the inner container.

4. The containment vessel according to any one of claims 1 to 3, wherein,

the outermost resin contains an unmodified polyolefin.

5. The containment vessel according to claim 4,

the outermost resin contains an acid-modified polyolefin and the unmodified polyolefin.

6. The containment vessel according to any one of claims 1 to 5, wherein,

the resin constituting the outer jacket has the same monomer unit as the outermost resin.

7. The containment vessel according to any one of claims 1 to 6, wherein,

the inner container is configured to have an outer shell and an inner bag and the inner bag is shrunk as the content decreases,

the outermost layer and the adjoining layer are disposed at the outer shell.

8. A method for manufacturing a storage container includes an integral molding step of integrally molding an inner container and an outer sleeve,

in the integral molding step, the outer jacket is formed by filling resin into a space outside the inner container in the cavity of the mold with the outer peripheral surface of the inner container disposed in the mold,

the inner container is provided with an outermost layer and an adjacent layer adjacent to the outermost layer,

the outermost layer resin constituting the outermost layer has a melting point lower than that of an adjacent layer resin constituting the adjacent layer.

9. The method of claim 8, wherein,

in the integral molding step, the inner container is pressurized.

10. The method of claim 8 or 9,

in the integral molding step, the resin is filled in a state where an inner surface of a bottom surface of the inner container is pressed by a support rod inserted into the inner container.

11. A double container comprising an outer shell, an external air inlet hole, and an inner bag,

the outer case is configured to be pressed from the outside, and the pressing causes the contents stored in the inner bag to flow out from the mouth portion,

the outside air introduction hole is provided in a specific region on a bottom side of the case, the bottom side being a side which is apart from the mouth when the double container is halved in the height direction,

and is configured to be fitted into a check valve, and air is introduced into an intermediate space between the inside of the outer shell and the outside of the inner bag through the check valve after the contents flow out, so that the shape of the outer shell is restored to its original shape,

the inner bag is configured to be compressed by the air introduced into the intermediate space when the content decreases.

12. The double-layered container according to claim 11,

the mouth portion is configured to receive a cap,

the top surface of the cover can be placed in an inverted manner as a ground plane.

13. The double-layered container according to claim 12,

the top surface of the cap has an area of S1, the mouth has an area of S2,

satisfies the condition that S1 is more than or equal to 1.5 multiplied by S2.

14. The double-layered container according to any one of claims 11 to 13,

the specific area is a portion of a side of the housing.

15. The double-layered container according to any one of claims 11 to 14,

the specific region is located in a recess of the housing,

and is configured to have an inclination angle with respect to an opening plane defining the recess.

16. The double-layered container according to claim 15,

the inclination angle is 5 degrees to 45 degrees.

17. The double-layered container according to claim 15 or 16,

the wall defining the recess is configured not to be perpendicular to the opening surface.

18. The double-layered container according to any one of claims 15 to 17,

further comprises a groove part, and the groove part,

the groove portion is provided on the housing at a position closer to the bottom side than the specific region.

19. The double-layered container according to claim 18,

the groove portion has a depth shallower than a depth of the recess portion.

20. The double-layered container according to any one of claims 11 to 19,

the check valve is a ball valve.

21. A double container comprising a container body having an outer shell and an inner bag, wherein the inner bag shrinks as the content decreases,

the container body is provided with a cylindrical trunk part and a bottom part arranged at the lower end of the trunk part,

the bottom portion includes a central recessed portion provided at a center of the bottom portion and a peripheral portion surrounding the central recessed portion,

an external air introducing hole is provided in the housing at the central recess,

a spacer member for forming a gap between the outer case and the inner bag is provided at the peripheral edge portion.

22. The bi-layered container according to claim 21,

the spacer member is a protrusion provided at the outer shell or the inner bag.

23. The double-layered container according to claim 21 or 22,

the spacing members are arranged radially.

24. The double-layered container according to claim 21 or 22,

the spacing members are configured to form a non-continuous circle.

25. The double-layered container according to any one of claims 21 to 24,

the container body is formed by heating an inner preform constituting the inner bag and an outer preform constituting the outer shell in a state where the inner preform and the outer preform are covered with the outer preform.

26. The bi-layered container according to claim 25,

the inner preform is provided with a positioning pin at the bottom of the inner preform,

the outer preform is provided with a locating hole at the bottom of the outer preform,

the blow molding is performed in a state where the positioning pin is inserted into the positioning hole.

27. A method for manufacturing a double container, comprising a blow molding step,

the blow molding step is performed by: heating and softening the inner preform and the outer preform in a state where the inner preform is covered with the outer preform, and blowing air into the inner preform in this state,

the inner preform is a blow-molded body,

the blow molding step is performed in a state in which the bottom portion of the outer preform is prevented from extending.

28. The method of claim 27, wherein,

the outer preform is provided with a reinforcing structure for suppressing extension of the bottom of the outer preform.

29. The method of claim 28, wherein,

the reinforcing formation is an annular protrusion provided at the bottom of the outer preform.

30. The method of any one of claims 27 to 29,

the blow molding step is performed in a state in which the bottom portion of the outer preform is supported by a bottom support mold to suppress extension of the bottom portion.

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