TWI828847B - Container and manufacturing method thereof - Google Patents

Abstract

The present invention provides a storage container with excellent appearance. According to the present invention, there is provided a storage container including a container body having a cover integrally molded to cover the outer peripheral surface of the blow-molded container, and the cover is an injection molded body.

Description

Container and manufacturing method thereof

The present invention relates to a storage container capable of storing contents.

Conventionally, there has been known a laminated peelable container that suppresses air from entering the interior of the container by shrinking the inner bag as the contents decrease (for example, Patent Document 1).

existing technical documents

patent documents

Patent Document 1: Japanese Patent Application Publication No. 2015-163531

The laminated peelable container of Patent Document 1 is configured by covering the outer peripheral surface of the container formed by blow molding with a shrink film, but a more high-end appearance is desired.

The present invention was made in view of the above-mentioned circumstances, and provides a storage container with excellent appearance.

According to the present invention, there is provided a storage container including a container main body with a jacket integrally molded to cover the outer peripheral surface of the blow-molded container, and the jacket is an injection molded body.

Blow molding has the advantage of easily manufacturing a multi-layer structure container, but the appearance of a container formed by blow molding (blow molded container) may be worse than that of a container formed by injection molding (injection molded container). In the storage container of the present invention, since the outer peripheral surface of the blow-molded container is integrally molded with an outer cover made of an injection molded body, it is easy to form a multi-layered structure and has excellent appearance.

Various embodiments of the present invention are illustrated below. The embodiments shown below can be combined with each other.

In the above-described storage container, it is preferable that the outer cover is integrally formed to cover the outer peripheral surface and the bottom surface of the blow-molded container.

In the above-described storage container, it is preferable that the blow-molded container has an outer shell and an inner bag, and the inner bag shrinks as the content decreases.

In the above-mentioned storage container, it is preferable that the outer cover is provided with a ventilation part that communicates an outer space of the storage container with the external air introduction part.

In the above-mentioned storage container, it is preferable that the above-mentioned outside air introduction part is provided in the bite-cut part of the above-mentioned outer casing.

In the above-mentioned storage container, it is preferable that the outer shell of the above-mentioned blow-molded container is provided with an outside air introduction part in a portion of the above-mentioned blow-molded container that is not covered with the above-mentioned jacket.

In the above-mentioned storage container, it is preferable that the above-mentioned external air introduction part is provided in a portion covered by the cylindrical part of the pump attached to the mouth part of the above-mentioned blow molded container.

The above-mentioned storage container preferably includes a protective cover covering the bite-cut portion of the above-mentioned blow molded container.

In the above-mentioned storage container, it is preferable that the nip portion of the above-mentioned blow-molded container is provided with a protruding portion protruding from the bottom surface of the above-mentioned blow-molded container.

A method of manufacturing a storage container, preferably including the step of integrally molding a blow-molded container and a jacket In the integrated molding step, in a state where the outer peripheral surface of the blow molded container is arranged in the mold, a space outside the blow molded container in the cavity of the mold is filled with resin to form the outer cover.

In the above method, it is preferable that the inside of the blow molding container is pressurized during the integral molding step.

In the above-described method, preferably, in the integral molding step, the blow-molded container is placed in the mold with a protective cover covering the nip portion of the blow-molded container attached.

In the above method, it is preferable that in the integral molding step, the filling of the resin is performed in a state where the inner surface of the bottom surface of the blow molded container is pressed with a support rod inserted into the blow molded container.

In the above-mentioned method, it is preferable that the bite-cut portion of the blow-molded container is provided with a protruding portion protruding from the bottom surface of the blow-molded container.

1: Containment container

2: Container body

3:Pump

3a: Main part

3a1: Barrel part

3a2: Cylinder part

3a3: Upper wall

3b: Piston part

3c:Nozzle

3d:tube

4: Blow molding container

4a: Outer peripheral surface

4b: Bottom surface

4c: Outside air introduction part

5: Jacket

5a: Barrel part

5b: bottom

5c:Ventilation part

7: Containment Department

7a:Torch

7b: Bottom

7c: Flange part

7d:bite incision

7e:Protrusion

8: Mold

8a: Chamber

8b: Gate

9: Mouth

9d: Engagement part

11: Fixed part

11a:Opening part

12: Shell

13: Support rod

14:Inner bag

15:Protective cover

15g: clearance

1A to 1B are perspective views of the storage container 1 according to the first embodiment when viewed from different directions.

2A to 2B are perspective views of the container body 2 when viewed from different directions.

FIG. 3 is a cross-sectional view of the container body 2 .

4A to 4B are perspective views of the blow molded container 4 when viewed from different directions.

FIG. 5 is a cross-sectional view of the blow molded container 4 .

Fig. 6 is a cross-sectional view for explaining the integral molding step.

FIG. 7 is an enlarged view of area A in FIG. 6 .

FIG. 8 is a perspective view of the pump 3 .

Fig. 9 is an enlarged view corresponding to the vicinity of the bottom surface 4b in Fig. 5 showing a state in which the protective cover 15 is attached to the blow molded container 4 in the second embodiment.

FIG. 10 is an enlarged view corresponding to the vicinity of the bottom surface 4 b in FIG. 3 . FIG. 10A shows a state in which the outer cover 5 covering the blow molded container 4 and the protective cover 15 in the state shown in FIG. 9 is formed. FIG. 10B shows the outer cover 5 from the state in FIG. 10A . The state after the ventilation part 5c is formed.

FIG. 11 is an enlarged view corresponding to the vicinity of the bottom surface 4b in FIG. 5 , showing a configuration in which a protruding portion 7e is provided in the nip portion 7d of the blow molded container 4 in the third embodiment.

FIG. 12 is an enlarged view of the vicinity of the mouth 9 in FIG. 4A showing a state in which the outside air introduction part 4 c is provided in the mouth 9 of the blow molded container 4 in the third embodiment.

Embodiments of the present invention will be described below. Various features shown in the embodiments shown below can be combined with each other. In addition, each feature may independently constitute an invention.

1. First Embodiment

As shown in FIG. 1 , the storage container 1 according to the first embodiment of the present invention includes a container body 2 and a pump 3 . As shown in FIG. 3 , the container body 2 includes a blow molded container 4 and an outer cover 5 integrated therewith. Each structure is explained below.

<Blow molded container 4>

The blow molded container 4 shown in Figures 4 to 5 can be formed by blow molding a parison. Blow molding can be direct blow molding or injection blow molding. In direct blow molding, a pair of split molds are used to clamp the molten material extruded from the extruder. The molten parison is blown into the parison to produce a container. The parison can be in the shape of a cylinder or a sheet. In injection blow molding, a test tube bottomed parison called a preform is formed by injection molding, and the parison is used for blow molding to produce a container.

The blow-molded container 4 may have a single-layer structure, but is preferably a multi-layer structure. It is difficult to manufacture an injection-molded container having a multi-layered structure. When the blow-molded container 4 has a multi-layered structure, the application of the present invention is of particular significance. When forming the blow-molded container 4 having a multi-layered structure, the parison also has a multi-layered structure. A parison composed of multiple layers (multilayer parison) can be formed by coextrusion.

In this embodiment, as shown in FIG. 5 , the blow-molded container 4 is a so-called laminated peeling container and has an outer shell 12 and an inner bag 14 , and the inner bag 14 shrinks as the content decreases. The inner bag 14 moves away from the outer shell 12 as the content decreases, so that the inner bag 14 moves away from the outer shell 12 and shrinks. With this kind of container, external air cannot easily enter the inner bag 14, so deterioration of the contents can be suppressed.

The shell 12 is made of, for example, low-density polyethylene, linear low-density polyethylene, high-density polyethylene, polypropylene, ethylene-propylene copolymer, or a mixture thereof. Housing 12 may be constructed in multiple layers. The inner bag 14 is preferably composed of multiple layers. For example, an EVOH layer made of ethylene-vinyl alcohol copolymer (EVOH) resin can be used as the layer in contact with the outer casing 12 , and a layer made of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, or high-density polyethylene can be used as the layer in contact with the content. The inner surface layer is composed of polyolefins such as high-density polyethylene, polypropylene, ethylene-propylene copolymer or their mixtures. Furthermore, it is preferable to use an adhesive layer between the EVOH layer and the inner surface layer.

The blow molded container 4 has a bottomed cylindrical shape and is provided with an accommodating part 7 for accommodating contents and a mouth part 9 for discharging the contents from the accommodating part 7 . The accommodating part 7 includes a trunk part 7a, a bottom part 7b, and a flange part 7c. The flange portion 7c is provided at the upper end of the trunk portion 7a. The flange portion 7c is provided to protrude radially outward from the trunk portion 7a. The mouth 9 is provided with an engaging portion (external thread portion) 9d to which the pump 3 can be mounted.

In addition, when direct blow molding is used to form the blow molded container 4, the blow molded container 4 has a nip portion 7d formed by extruding the parison with a pair of split dies. The nip portion 7d is provided at the bottom 7b of the blow molded container 4. The opposing surfaces of the parison are welded to each other at the nip portion 7d, thereby closing the bottom of the blow molded container 4. The bite portion 7d closes the respective bottoms of the outer shell 12 and the inner bag 14. However, the bite portion 7d in the outer shell 12 is particularly weak. Therefore, by applying an impact to the outer shell 12, the bite portion 7d can be opened and placed on the outer shell 12. The outside air introduction part 4c is formed. The outside air introduction part 4c allows outside air to be introduced between the outer shell 12 and the inner bag 14. The outside air introduction part 4c may be formed by perforating the casing 12. The outside air introduction part 4c may be provided in the accommodating part 7 or the mouth part 9.

<Coat 5>

As shown in FIGS. 2 and 3 , the jacket 5 is integrally molded to cover the outer peripheral surface 4 a (preferably the outer peripheral surface 4 a and the bottom surface 4 b ) of the container 4 , and is an injection molded body. The outer cover 5 includes a cylinder portion 5a and a bottom portion 5b. The cylindrical part 5a and the bottom part 5b cover the outer peripheral surface 4a and the bottom surface 4b, respectively.

If the outside air introduction part 4c of the blow molded container 4 is covered with the outer casing 5, outside air cannot be introduced through the outside air introduction part 4c. Therefore, the outer cover 5 is provided with the ventilation part 5c which connects the outer space of the storage container 1 and the external air introduction part 4c. The ventilation part 5c may be a through hole or a groove. The ventilation part 5c may be formed during injection molding, or may be formed by post-processing after injection molding.

The outer cover 5 at least covers the receiving part 7 and may or may not cover the mouth part 9 . When the outer cover 5 does not cover the mouth part 9, if the outside air introduction part 4c is provided in the mouth part 9, the ventilation part 5c will be unnecessary.

The container body 2 can be manufactured by a method including an integral molding step of integrally molding the blow molded container 4 and the outer cover 5 . As shown in FIGS. 6 to 7 , in the integrated molding step, the mouth 9 is fixed to the fixing part 11 having the opening 11 a, and the outer peripheral surface 4 a (preferably the outer peripheral surface 4 a and the bottom surface 4 b) of the blow molded container 4 is arranged on In the injection mold 8, in this state, the support rod 13 is inserted into the blow molding container 4, and the support rod 13 is pressed against the inner surface of the bottom surface 4b. This can prevent the housing portion 7 of the blow molding container 4 from being displaced during injection molding.

In this state, the outer space of the blow molding container 4 in the cavity 8 a of the mold 8 is filled with resin to form the jacket 5 . At this time, in order to prevent the blow molded container 4 from deforming due to the resin pressure, it is preferable to pressurize the inside of the blow molded container 4 . Pressurization can be performed by injecting water or gas. Resin can be filled into the chamber 8a from the gate 8b. The gate 8b is preferably arranged at a position facing the bottom surface 4b (preferably the nip portion 7d) of the blow molded container 4. At this time, the resin can easily be filled uniformly around the entire periphery of the blow molded container 4 .

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 outer shell 12 of the blow molded container 4 . The blow molded container 4 is preferably pre-stripped before the inner bag 14 is formed in the integral molding step. This is because it is easier to perform pre-peeling before integrally molding the jacket 5 with the blow-molded container 4 .

When forming the vent part 5 c during injection molding, for example, a method may be adopted in which a pin is arranged in advance at a location corresponding to the vent part 5 c and the pin is pulled out from the outer casing 5 when the container body 2 is taken out from the mold 8 .

<Pump 3>

The pump 3 is configured to discharge the contents from the blow molded container 4 . When the blow molded container 4 is a stacked and peelable container, the pump 3 is preferably configured so that outside air is not introduced into the blow molded container 4 .

As shown in FIG. 8 , the pump 3 includes a main body 3a, a piston 3b, a nozzle 3c, and a pipe 3d. The main body part 3a includes a cylindrical part 3a1, a cylinder part 3a2, and an upper wall part 3a3. An engaging portion (internal thread) (not shown) that engages with the engaging portion (external thread portion) 9d is provided on the inner surface of the cylindrical portion 3a1. The cylinder part 3a2 is inserted into the mouth part 9. The outer diameter of the cylinder part 3a2 substantially matches the inner diameter of the mouth part 9. The cylinder part 3a2 is cylindrical, and the piston part 3b is slidable in the cylinder part 3a2. The internal space of the cylinder part 3a2 communicates with the nozzle 3c and the pipe 3d. A pump mechanism composed of an elastic member and a valve is built into the internal space of the cylinder portion 3a2. By sliding the piston part 3b and operating the pump mechanism, the content sucked up through the tube 3d can be discharged from the nozzle 3c.

2. Second embodiment

The second embodiment of the present invention will be described using FIGS. 9 and 10 . This embodiment is similar to the first embodiment, and the main difference is the use of the protective cover 15 . The differences are explained below.

As shown in FIG. 7 , when the gate 8 b is disposed at a position facing the nip portion 7 d of the blow molded container 4 , the high-temperature resin injected from the gate 8 b comes into contact with the inner bag 14 at the nip portion 7 d, causing the inner bag to 14Easily damaged by heat. Therefore, in this embodiment, as shown in FIG. 9 , in order to prevent the inner bag 14 from being damaged by heat, the protective cover 15 is provided to cover the nip portion 7d. In FIG. 9 , the protective cover 15 covers the entire bottom surface 4 b, but the protective cover 15 may cover only a part of the bottom surface 4 b including the undercut portion 7 d.

The protective cover 15 only needs to be able to protect the inner bag 14 at the nip portion 7 d, and its thickness and material are not particularly limited. For example, the protective cover 15 has the same numerical value as that of the outer shell 12 . At this time, the protective cover 15 is less conspicuous and has an excellent appearance. On the other hand, heat resistance may be taken into consideration and a material having better heat resistance than the housing 12 may be used.

The protective cover 15 can be installed on the blow molded container 4 using methods such as fitting, welding, and bonding. In FIG. 9 , there is a step difference between the end of the protective cover 15 and the housing 12 . Alternatively, the protective cover 15 may be installed so that there is no step difference between the end part of the protective cover 15 and the housing 12 . At this time, the protective cover 15 is less conspicuous. A gap 15g is provided between the protective cover 15 and the blow molded container 4.

By disposing the blow molded container 4 in the mold 8 shown in FIG. 6 with the protective cover 15 attached thereto, and performing the integral molding step in the same manner as in the first embodiment, the cover blow molded container 4 can be formed as shown in FIG. 10A The outer shell 5 of the container 4 is formed. Next, as shown in FIG. 10B , the ventilation portion 5c can be formed in the outer cover 5 by perforating the outer shell 5 using a drilling tool such as a drill. In the present embodiment, the gap 15g is provided between the protective cover 15 and the blow molded container 4. Therefore, when the vent 5c is formed in the outer cover 5, the punching can be stopped when the tip of the punching tool reaches the gap 15g, thereby suppressing the punching. Tool damages inner bag 14.

It should be noted that the gap 15g can be omitted when not needed, and the protective cover 15 can be tightly connected to the bottom surface 4b. For example, as shown in FIG. 12 , when the outside air introduction part 4 c is provided in the part of the blow molded container 4 that is not covered by the jacket 5 (for example, the mouth part 9 ), the ventilation part 5 c and the gap 15 g are not required.

3. Third Embodiment

The third embodiment of the present invention will be described using FIGS. 11 and 12 . This embodiment is the same as the 1 is similar to the embodiment, and the main difference is that the bite portion 7d of the blow molded container 4 is provided with a protruding portion 7e. The differences are explained below.

As described in the first embodiment, the support rod 13 is pressed against the inner surface of the bottom surface 4b in the integral molding step. However, in this case, the pressing force of the support rod 13 may cause the inner bag 14 to crack at the nip portion 7d. Therefore, in this embodiment, in order to suppress the inner bag 14 from cracking, as shown in FIG. 11, the protruding part 7e is provided in the nip part 7d of the blow molded container 4.

The protruding portion 7e is formed by protruding the undercut portion 7d from the bottom surface 4b. This increases the welding area of the inner bag 14 at the nip portion 7d and improves the sealing strength of the inner bag 14, thereby suppressing cracking of the inner bag 14. As shown in Figure 11, the housing 12 is preferably sealed at the protrusion 7e.

By arranging the blow-molded container 4 of this shape in the mold 8 shown in FIG. 6 and performing the integral molding step in the same manner as in the first embodiment, the outer cover 5 covering the blow-molded container 4 can be formed. The protruding portion 7e can prevent the inner bag 14 from being damaged by heat of the resin injected from the gate 8b.

When the casing 12 is sealed, the outside air introduction part 4c is not provided in the nip part 7d. Therefore, it is preferable to provide a through hole in the casing 12 to form the outside air introduction part 4c. At this time, it is preferable that the outside air introduction part 4c is provided in the part of the blow molded container 4 which is not covered by the outer cover 5. This is because there is no need to provide the ventilation part 5c in the outer cover 5 at this time.

As shown in FIG. 12 , the outside air introduction part 4 c is preferably provided at the mouth part 9 , and particularly preferably is provided at a position covered by the cylindrical part 3 a 1 of the pump 3 shown in FIG. 8 . At this time, the outside air introduction part 4c is not visible when the pump 3 is installed, so the appearance is excellent. The outside air introduction part 4c can be connected by the piston part 3b and the cylinder part 3a1 A ventilation path such as a gap therebetween or a gap between the lower end of the cylindrical portion 3a1 and the blow-molded container 4 is ventilated to the outside.

Moreover, it is preferable that the external air introduction part 4c is provided in the flat part 9a provided in the mouth part 9. This is because at this time, the outside air introduction portion 4c can be easily formed using a drilling tool such as a drill. The flat portion 9a may be provided closer to the accommodating portion 7 than the engaging portion 9d, or may be provided to cut off the engaging portion 9d. The latter has the advantage that the mouth 9 does not need to be elongated in order to provide the flat portion 9a.

1: Containment container

2: Container body

3:Pump

3a1: Barrel part

Claims (6)

A storage container is provided with a container body, the container body is integrally formed with a jacket so as to cover the outer peripheral surface and the bottom surface of the blow molded container, wherein the jacket is an injection molded body, and the blow molded container is configured to have an outer shell and an inner bag, and the inner bag shrinks as the content decreases. The outside air introduction part is provided at the bite-cut part of the outer shell. The outer cover is provided with an outside space of the container and an outside air introduction part. Connected through holes. The storage container according to claim 1, further comprising a protective cover covering the bite-cut portion of the blow-molded container. A method of manufacturing a storage container, which includes an integral molding step of integrally molding a blow molded container and an outer casing, wherein in the integral molding step, in a state where the outer peripheral surface of the blow molded container is placed in a mold, The outer space of the blow molded container in the cavity of the mold is filled with resin to form the jacket. The jacket is formed to cover the outer peripheral surface and the bottom surface of the blow molded container. The blow molded container is configured to have The outer shell and the inner bag shrink as the content of the inner bag decreases. The outer shell is provided with an external air inlet portion at the bite portion. A through hole connecting the introduction part. The method according to claim 3, wherein the inside of the blow molding container is pressurized during the integral molding step. The method according to claim 3 or 4, wherein in the integrated molding step, the blow molding container is installed with a cover covering the blow molding container. The mold is placed in the mold with a protective cover covering the bite portion of the tool. The method according to claim 3 or 4, wherein in the integrated molding step, the inner surface of the bottom surface of the blow molded container is pushed by a support rod inserted into the blow molded container. Resin filling.

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