JP5652766B2 - Plastic container - Google Patents

Description

The present invention relates to a synthetic resin container having a double wall structure in which a thin inner layer is detachably laminated inside an outer layer forming an outer shell.

Patent Document 1 describes an invention relating to a so-called delami bottle, which is formed by blow molding having a double wall structure in which a thin inner layer is detachably laminated inside an outer layer forming an outer shell. Such a delami bottle is used as a squeeze-type dispensing container or a container body of a dispensing container with a pump due to its function.
FIG. 4 is a partially longitudinal side view showing a typical example of a dispensing container with a pump using a delami bottle as a container body.
This pour-out container is obtained by assembling and fixing the manual pressing pump 31 by a cap body 109 to a mouth tube portion 103 of a box-shaped container main body 101 by blow molding.
The container body 101 has a layer structure in which an outer layer 111 that forms an outer shell and an inner layer 112 that forms an inner bag that can be deformed and deformed are detachably laminated. In addition, an intake hole 113 for introducing outside air between the outer layer 111 and the inner layer 112 is provided in a predetermined portion of the outer layer 111, in the mouth tube portion 103 in the example of FIG.

The container body 101 can be obtained by co-extrusion of a synthetic resin for the outer layer 111 and a synthetic resin for the inner layer 112, which have little compatibility, to form a laminated parison, and then blow-mold the laminated parison.
In addition, in this type of delami bottle, the inner layer 112 is reduced and deformed in a deflated manner by the amount of the content liquid poured out, so that the outside air can be prevented from entering the container body 101 and the quality of the content liquid is reduced. And a function (hereinafter, referred to as a delamination function) that the dispensing operation can be smoothly achieved even when the content liquid is low.
Since the outside air enters the space between the outer layer 111 and the inner layer 112 through the intake hole 113 as the inner layer 112 is reduced in volume, the pressure balance is maintained as a whole container, so the next dispensing operation should be performed smoothly. Can do.

JP 2003-072785 A

Here, in the delamination bottle by blow molding as described above, the bottom seal portion 108 (see FIG. 4) formed when the parison is pinched off has a layer configuration of outer layer / inner layer / outer layer, and the outer layers 111 pass through the inner layer 112. However, since the outer layer 111 and the inner layer 112 are originally formed so as to be peelable, there is a problem that a bottom crack is likely to occur essentially from the bottom seal portion 108 as a starting point.
In addition, blow molding has a limitation in molding with respect to the point that the outer layer is thick and the glossiness of the outer surface, such as a container for cosmetics by an injection molding method. There is a limit to providing a high-class feeling by making a three-dimensional appearance appear.

An object of the present invention is to eliminate the problem of the delamination bottle by blow molding as described above, and there is no fear of bottom cracking, and the delamination function to which a high-class feeling is given by the outer layer forming the outer shell is provided. An object of the present invention is to provide a synthetic resin container.

Among the means for solving the above technical problems, the main configuration of the present invention is as follows.
In a synthetic resin container,
A double-walled cylindrical body in which an inner layer is peelably laminated on an outer layer forming an outer shell by a double injection molding method, and a bottomed cylindrical shape by a bottom member fitted to the lower end portion of the double-walled cylindrical body,
In the state where the inner layer is fixed to the outer layer at the upper and lower ends of the double-walled cylinder, the inner layer is a deflated volume reduction deformation by reducing the internal pressure with the upper and lower peripherally fixed parts as fixed ends Can be made thin,
In addition, an intake hole for introducing outside air between the outer layer and the inner layer is opened in a predetermined portion of the outer layer of the double-walled cylinder.

  The above configuration is a Delami bottle using a double injection molding method such as a two-color molding method or an insert molding method described later, and according to this double injection molding method, the outer layer and the inner layer are almost not compatible with each other. By using polypropylene (PP) resin and nylon resin, it is possible to form a double-walled cylinder with an outer layer and an inner layer peelable, and a bottom member is fitted to the lower end of this double-walled cylinder Thus, it is possible to provide a container having a delamination function as a bottomed cylindrical shape by an inner layer peeling and volume-reducing deformation function and an outside air introduction mechanism through an intake hole.

And the container which has the double wall cylinder of the said structure can eliminate the restrictions resulting from the shaping | molding method called blow molding in the delami bottle by blow molding mentioned above.
That is, first, since the bottom portion is formed by the bottom member, it is possible to eliminate the concern about the bottom crack starting from the bottom seal portion formed at the time of blow molding.
For the outer layer forming the outer shell, for example, the outer surface is made highly glossy with a mirror finish, or it is decorated with a transparent and thick wall to make it crystallized. It is possible to give a high-class feeling in various modes by taking advantage of the characteristics of injection molding.

  Another configuration of the present invention is that, as described above, the double injection molding method is a two-color molding method or an insert molding method in the above main configuration.

Here, the two-color molding method is a method in which different colors, materials, and the like are divided into two portions and are integrally molded.
An example of the molding method of the double-walled cylindrical body of the present application will be schematically described. First, a cylindrical inner layer portion is injection-molded by primary molding, and the cavity die is fitted with the inner layer portion externally fitted to a core die. Etc. are exchanged, and the outer layer portion is injection-molded into a cylindrical shape by secondary molding to form a double-walled cylindrical body in which the inner layer and the outer layer are laminated.

On the other hand, in the insert molding method, a resin such as a metal member, a label, or a synthetic resin member is set as an insert material in a mold cavity, and a resin is injection-molded. This is a molding method.
Schematically explaining an example of the molding method of the double-walled cylinder of the present application, first, a cylindrical inner layer portion formed by an inner layer is injection-molded, and this inner layer portion is set as an insert material in a mold cavity, More specifically, an outer fitting is set in a cylindrical core mold, and the outer layer portion is injection-molded into a cylindrical shape to form a double wall cylinder in which the inner layer and the outer layer are laminated.

Still another configuration of the present invention is the above main configuration,
The upper end of the inner layer is fixed to the upper end of the double-walled cylinder using the cap body, and the lower end of the inner layer is fixed to the outer layer circumferentially using the bottom member. It is said.

The above configuration relates to a specific configuration for circumferentially fixing the inner layer of the double-walled cylinder to the outer layer, and the container of the present invention is a dispensing container with a cap body or the like fitted to the upper end portion. However, the above configuration uses the cap body to fix the upper end of the inner layer in a circumferential shape.
Further, the lower end portion of the inner layer can be fixed in a circumferential shape using a bottom member.

Still another configuration of the present invention is the above main configuration,
The bottom member has a fitting cylinder piece fitted on the lower end of the double-walled cylinder, and is fitted into the lower end of the double cylinder from the lower end of the fitting cylinder piece via an inner flange piece. The fitting convex portion is integrally provided, and the inner layer is fixed to the outer layer circumferentially by the base end portion of the fitting convex portion.

The above configuration relates to a specific shape of the bottom member, and the inner layer can be reliably fixed to the outer layer in a circumferential shape by using the fitting cylindrical piece and the fitting convex portion of the bottom member.

The synthetic resin container of the present invention has the above-described configuration and exhibits the following effects.
That is, in the container having the above main configuration,
A container having a double-walled cylinder by a double injection molding method can eliminate the concern of bottom cracks starting from the bottom seal part formed at the time of blow molding because the bottom part is formed by a bottom member. For the outer layer that forms the outer shell, for example, the outer surface is made highly glossy with a mirror finish, or it is decorated with a transparent, thick wall and a crystal shape. By utilizing the characteristics of injection molding, it is possible to give a high-class feeling in various modes that are difficult to realize by blow molding.

It is a semi-longitudinal front view of the container of the present invention. It is a half vertical side view of an example of the extraction container with a pump using the container of FIG. 1 as a container main body. It is a schematic explanatory drawing which shows an example of the double injection molding method for shape | molding the container of this invention. It is a side view which partially shows the pouring container with a pump using the delami bottle by blow molding for the container main body.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below along the examples with reference to the drawings.
FIG. 1 is a half longitudinal front view of an embodiment of a synthetic resin container according to the present invention, and FIG. 2 is a half longitudinal side view of a dispensing container with a pump using the container of FIG. 1 as a container body.

A container body 1 which is an embodiment of a synthetic resin container according to the present invention shown in FIG. 1 is composed of a double cylindrical wall body 2 and a bottom member 7 fitted to the lower end portion of the double cylindrical wall body 2. .
The shape of the double cylinder wall body 2 is such that the mouth tube part 3 is continuously connected to the upper end part of the cylindrical body part 5 through the shoulder part 4 so as to reduce the diameter, and is thick over the entire height range. It has a double wall structure in which a thin inner layer 12 is detachably laminated on an outer layer 11 that forms an outer shell with meat.

In this embodiment, block copolymer polypropylene (PP) resin is used for the outer layer 11 and nylon resin is used for the inner layer 12, and the outer layer 11 and the inner layer 12 are detachably laminated by a combination of both resins. . The thickness of the outer layer 11 at the body 5 is 4 mm, and the thickness of the inner layer 12 is about 0.3 mm.
And the outer peripheral surface of the double cylinder wall body 2 has high glossiness by the above-mentioned structure, and a high-quality texture is combined with the frost feeling by the thick outer layer 11 made of block copolymerized PP resin. Has appeared.

As will be described later, the inner layer 12 is circumferentially fixed to the outer layer 11 at the upper end portion. Therefore, the upper end portions of the outer layer 11 and the inner layer 12 are formed in an inner collar shape, and the inner layer 12 is thickened so that the inner layer 12 is the outer layer 11. The structure is laminated below. (Hereinafter, the portion fixed in the circumferential shape is referred to as an upper peripheral fixing portion 14a (see FIG. 1)).
In addition, a pair of intake holes 13 are opened at positions symmetrical to the central axis in the portion directly above the lower end of the outer layer 11 in order to introduce outside air between the outer layer 11 and the inner layer 12.

  The bottom member 7 has a fitting cylinder piece 7a that is fitted on the lower end portion of the double wall cylindrical body 2, and the double wall cylinder body from the lower end portion of the fitting cylinder piece 7a via an inner flange peripheral piece 7b. The fitting convex part 7c which fits into the lower end part of 2 is integrally provided, and the lower end part of the inner layer 12 is fixed to the outer layer 11 circumferentially and airtightly at the base end part of the fitting convex part 7c. Yes. (Hereinafter, the portion fixed in the circumferential shape is referred to as a lower peripheral fixing portion 14b (see FIG. 1)).

FIG. 3 is a schematic explanatory view showing a two-color molding method as an example of a double injection molding method for molding the above-described double wall cylindrical body 2. Hereinafter, a double wall will be described with reference to FIG. 3. The molding process of the double injection molding method for molding the cylinder 2 will be described.
FIG. 3A is a semi-longitudinal sectional view showing the configuration of the first mold 51a used for the first molding for molding the inner layer 12, and is composed of a core mold 52 and a cavity mold 53a. Using the first mold 51a, the resin for the inner layer 12 is injected and filled into the cavity 56a from the gate 55a in a molten state, and the cylindrical inner layer 12 portion is molded.
Next, after the first molding, the cavity mold 53a is opened, and the core mold 52 is moved in a state where the cylindrical inner layer 12 is externally fitted as shown in FIG.

Next, FIG. 3C is a semi-longitudinal sectional view showing the configuration of the second mold 51b used for the second molding for molding the outer layer 11, and the cylindrical inner layer 12 is outer as shown in FIG. The core mold 52, the cavity mold 53b, and the upper mold 54b are fitted, and the resin for the outer layer 11 is melted from the gate 55b to the cavity 56b using the second mold 51b. Injection, filling, and forming the outer layer 11 in a laminated form outside the cylindrical inner layer 12.
Then, the cavity mold 53b and the upper mold 54b are opened, and as shown in FIG. 3D, the double-wall cylinder 2 can be obtained by removing the mold from the core mold 52.

Next, with reference to FIG. 2, an example of the extraction container with a pump using the container main body 1 of FIG. 1 will be described.
2 is mainly referred to as a container body 1, which is a container having a delamination function of the present invention, a pump 31, and a cap body 9 for assembling and fixing the pump 31 to the upper end portion of the container body 1. Consists of two members.
The pump 31 is assembled and fixed to the mouth tube portion 3 of the double-walled tube body 2 by a cap body 9, and a nozzle head 32 having a discharge port at the upper portion and a suction pipe 33 at the lower portion is arranged. It is said.
Further, the overcap 10 is attached to the cap body 9 so as to cover the nozzle head 32.

  Further, as shown in FIG. 2, the locking cylinder piece 9 a of the cap body 9 presses the end surface of the inner layer 12 against the outer layer 11 in a state where the pump 31 is assembled and fixed to the container body 1 by the cap body 9. The inner layer 12 is circumferentially fixed at the upper end portion to form an upper peripheral fixed portion 14a.

Here, in the dispensing container of FIG. 2, the upper end portion of the inner layer 12 is fixed in a circumferential shape using the portion of the cap body 9, but the shape of the upper end portions of the outer layer 11 and the inner layer 12 and the lamination state are set. It is also possible to adopt a configuration in which the outer layer 11 and the inner layer 12 themselves maintain a state where the inner layer 12 is fixed in a circumferential shape by appropriately selecting.
For example, in the container main body 1 of FIG. 1, as described above, the upper ends of the outer layer 11 and the inner layer 12 are formed in an inner bowl shape, the inner layer 12 is thickened, and the inner layer 12 is laminated below the outer layer 11. It is also possible to adopt a configuration that maintains the state in which the inner layer 12 is circumferentially fixed to the outer layer 11 without using a portion of the cap body 9 such as the locking cylinder piece 9a. .
Furthermore, if the outer surface 11 is laminated along the unevenness in the second molding if the outer surface of the inner layer 12 is formed by the first molding described above, the adhesion between the outer layer 11 and the inner layer 12 is increased by the unevenness. The fixed state by the outer layer 11 and the inner layer 12 itself can be maintained more firmly.

And in the container with a pump comprised in this way, when the content liquid L is poured out by the pushing-down operation to the nozzle head 32, as the content liquid L decreased, as shown by the dashed-two dotted line in an inside layer, 12 is reduced in volume and deformed, and outside air is introduced between the outer layer 11 and the inner layer 12 through the intake hole 13.
Here, the volume reduction deformation of the inner layer 12 proceeds with the upper peripheral fixed portion 14a and the lower peripheral fixed portion 14b as the fixed portions, and thus progresses in a reduced diameter toward the central axis as a whole.
In addition, when the adhesion between the outer layer 11 and the inner layer 12 is large and peeling does not proceed smoothly, in order to make the volumetric deformation of the inner layer 12 proceed more smoothly, the space between the outer layer 11 and the inner layer 12 from the intake hole 13 is increased. It is preferable to eliminate the contact state between the outer layer 11 and the inner layer 12 in advance by blowing compressed air or the like.

As described above, the configuration of the container of the present invention and the pumping container using the container as a container main body and the operation effect thereof have been described according to the examples. However, the embodiment of the present invention is limited to the above examples. It is not something.
First, in the examples of the container described above, an example in which block copolymer PP resin is used for the outer layer and nylon resin is used for the inner layer is shown. Of course, the appearance of the container, double injection moldability, peelability of the outer layer and the inner layer are shown. In consideration of the above, a combination of other synthetic resins can be appropriately selected. Moreover, although the trunk | drum was made into the cylindrical shape in the said Example, other cylindrical shapes, such as an elliptical cylinder shape and a long cylindrical shape, can be selected according to the intended purpose.

Further, regarding the double injection molding method, the two-color molding method has been described in the above embodiment, but the molding procedure and the mold structure are merely examples, and various types are considered in consideration of the shape of the molded product, the molding apparatus, and the like. Variations can be employed, and an insert molding method can be used.
Moreover, the circumferential fixing method at the upper end and the lower end of the inner layer can also be selected from various modes.
Moreover, about the extraction container with a pump, the fixing method of the pump shown in FIG. 2, a cap body, or a pump is only the example.

As described above, the synthetic resin container of the present invention is designed to exhibit the delamination function by the double injection molding method, and is difficult to realize by blow molding taking advantage of the characteristics of the injection molding method. It can be used for a wide range of uses such as a container body of a dispensing container with a pump for cosmetics.

DESCRIPTION OF SYMBOLS 1; Container main body 2; Double wall cylinder 3, 103; Mouth part 4; Shoulder part 5; Body part 7; Bottom member 7a; Fitting cylinder piece 7b; 109; cap body 9a; locking cylinder piece 10; overcaps 11, 111; outer layers 12, 112; inner layers 13, 113; intake holes 14a; upper periphery fixing portion 14b; Suction pipe 34; packing 51a; first mold 51b; second mold 52; core mold 53a, 53b; cavity mold 54b; upper mold 55a, 55b; gate 56a, 56b cavity 101; Bottom seal part L; Contents liquid

Claims (4)

A double wall cylinder (2) in which an inner layer (12) is peelably laminated on an outer layer (11) forming an outer shell by a double injection molding method, and fitted to the lower end of the double wall cylinder (2). The bottom member (7) is joined to form a bottomed cylinder, and the inner layer (12) is circumferentially fixed to the outer layer (11) at the upper end and the lower end of the double-walled cylinder (2). (12) The upper and lower circumferentially fixed portions are used as fixed ends to form a thin wall that can be deflated and reduced in volume by reducing internal pressure, and a predetermined portion of the double-walled cylinder (2) A synthetic resin container characterized in that an intake hole (13) for introducing outside air is opened between the outer layer (11) and the inner layer (12) in the outer layer (11) portion of the container. The synthetic resin container according to claim 1, wherein the double injection molding method is a two-color molding method or an insert molding method. The upper end of the inner layer (12) is used by using the cap body (9) that is fitted to the upper end of the double-walled cylinder (2), and the inner layer (12) is used by using the bottom member (7). The synthetic resin container according to claim 1 or 2, wherein the lower end of the container is fixed circumferentially to the outer layer (11). The bottom member (7) has a fitting cylinder piece (7a) that is fitted on the lower end portion of the double-walled cylinder (2), and the inner flange piece (7a) extends from the lower end portion of the fitting cylinder piece (7a). 7b) is integrally provided with a fitting convex portion (7c) fitted into the lower end portion of the double cylinder (2), and an inner layer (12) by a base end portion of the fitting convex portion (7c). The synthetic resin container according to claim 1, 2 or 3, which is configured to be fixed circumferentially to the outer layer (11).

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