JP6091982B2 - Double container manufacturing method and double container - Google Patents

Description

  The present invention relates to a method of manufacturing a double container in which an inner layer body that contains contents is accommodated inside an outer layer body, and a double container.

  As a container for storing cosmetics such as skin lotion, shampoo, rinse, liquid soap, food seasoning, etc., an inner layer body having a storage section for storing contents and the inner layer body are detachably stored. The outer layer body is provided and the contents are poured out by pressing the body portion of the outer layer body. A double container is known in which outside air is introduced into the body so that the body can be restored while reducing the volume of the inner layer body (see, for example, Patent Document 1). Since this type of container can be poured out without replacing the contents with the outside air, the contact of the contents with the outside air can be reduced, and deterioration and alteration can be suppressed.

JP 2001-106263 A

  As such a double container, a delamination container called a delamination container is known. In this case, the double container is formed by coextruding a synthetic resin for an outer layer and a synthetic resin for an inner layer, which have low compatibility. A laminated parison is formed, and this laminated parison is blow-molded using a mold to form a laminated structure in which the outer layer body and the inner layer body are in close contact with each other. Therefore, after blow molding, for example, air is pumped from the outside air introduction hole, or negative pressure is sucked from the spout to shrink the inner layer body, and the whole is peeled off from the outer layer body. Air is fed into the outer layer body, and the whole is again brought into close contact with the outer layer body so that the inner layer body can be easily separated from the outer layer body when the contents are poured out.

  However, in the conventional double container, as described above, even after the inner layer body is once completely peeled off from the outer layer body after blow molding, the entire inner surface of the inner layer body is again in close contact with the entire inner surface of the outer layer body. For this reason, it may not be possible to introduce outside air between the inner layer body and the outer layer body when the contents are poured out. As a result, there are cases where the inner layer body is poorly peeled or the outer layer body is deformed without being restored to its original shape.

  An object of the present invention is to solve such a conventional problem, and the object thereof is to facilitate peeling of the inner layer body from the outer layer body, and when the contents are poured out, the inner layer body and the outer layer body are provided. It is to propose a method of manufacturing a double container and a double container that can prevent the inner layer body from being peeled badly and the outer layer body from being deformed by introducing outside air between them.

In order to solve the above problems, a method for producing a double container according to the present invention comprises a bottle-shaped outer layer body and a method for producing a double container comprising an inner layer body that is detachably laminated on the inner side of the outer layer body. An outside air introduction that blow-molds a laminated parison formed by the outer layer parison that becomes the outer layer body and the inner layer parison that becomes the inner layer body, and introduces outside air between the inner layer body and the outer layer body. A molding step for forming a hole; a peeling step for peeling the inner layer body from the outer layer body after the molding step; and applying a pressing force from the outside of the outer layer body, so that the outer layer body is at least temporarily a pressing step of deforming, toward the outer body deformed saw including a restoration process, the reconstructing the inner body, after the restoration process, between the inner member and the outer layer body by releasing the pressing force to form a space to And wherein the door.

The method for producing a double container of the present invention is a method for producing a double container comprising a bottle-shaped outer layer body and an inner layer body that is detachably laminated on the inner side of the outer layer body, A molding step of blow molding a laminated parison molded by an outer layer parison as a body and an inner layer parison as an inner layer body, and providing an outer air introduction hole in the outer layer body for introducing outside air between the inner layer body; A peeling step for peeling the inner layer body from the outer layer body after the forming step, a pressing step for deforming the outer layer body at least temporarily by applying a pressing force from the outside of the outer layer body, and deformation. A restoring step of restoring the inner layer body toward the outer layer body, wherein the outer layer body before performing the pressing step has a convex shape protruding outward, and the convex shape By pressing force Rolling deforming and forming a space between the inner member and the outer layer body.

  According to the double container manufacturing method and the double container of the present invention, the inner layer body is easily peeled from the outer layer body, and the outside air is introduced between the inner layer body and the outer layer body when the contents are poured out. Further, it is possible to prevent the peeling failure of the inner layer body and the deformation of the outer layer body.

(a) is a perspective view of the lamination peeling container which is one Embodiment of the double container of this invention, (b) is a fragmentary sectional view of the lamination peeling container after a formation process and before a peeling process. (C) is a partial cross-sectional view showing the delamination container after the peeling process and before the pressing process, (d) is a partial cross-sectional view showing the delamination container in the pressing process and the restoration process, and (e) It is a perspective view which shows the delamination container which canceled the pressing force after the decompression | restoration process. (a) is a fragmentary sectional view which shows the lamination peeling container before a peeling process after a shaping | molding process, (b) is a figure which shows the lamination peeling container in a press process after performing a peeling process. (C) is a partial cross-sectional view showing the delamination container that has been plastically deformed after the pressing process and before the restoration process, and (d) is a partial cross-sectional view showing the delamination container after the restoration process, ) Is a perspective view showing the delamination container after the pressing step. (a) is a fragmentary sectional view which shows the delamination container after a formation process, (b) is a figure which shows the delamination container after a peeling process. (C) is a partial cross-sectional view showing a deformed delamination container after the pressing step, (d) is a partial cross-sectional view showing the delamination container after the restoration step, and (e) is a forming step. It is a perspective view which shows the delamination container before a press process later, (f) is a perspective view which shows the delamination container after a press process.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a delamination container 1 which is an embodiment of a double container of the present invention is laminated in a bottle-like outer layer body 2 constituting an outer shell, and inside the outer layer body 2 so as to be peelable. And an inner layer body 3.

  The outer layer body 2 is formed in a bottle shape having a spout 2a formed in a cylindrical shape having a circular cross section and a body portion 2b having a circular cross section integrally connected to the spout 2a. The trunk | drum 2b has flexibility, and while being squeezed and can be dented, it can restore | restore from the dented state to the original shape. In this example, the shape of the outer layer body 2 has a circular cross section of the body portion 2b, but is not limited thereto, and can be any shape. Moreover, as raw material resin of the outer layer body 2, for example, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) or the like can be used, but is not limited thereto.

  The inner layer body 3 is formed in a thin bag shape inside the outer layer body 2. The opening 3a of the inner layer body 3 is continued to the opening end of the spout 2a of the outer layer body 2, and the inner layer body 3 is continued from the opening 3a to the accommodating portion 3b. For example, cosmetics such as lotion, shampoo, rinse, liquid soap, and liquid contents such as food seasonings are stored in the storage unit 3b. For example, nylon, EVOH, or the like can be used as the material resin of the inner layer body 3, but is not limited thereto. From the viewpoint of peelability, the material resin of the outer layer body 2 and the inner layer body 3 is preferably a combination of resins having low compatibility with each other. For example, the outer layer body 2 is made of polyethylene (PE), and the inner layer body 3 Can be nylon or EVOH.

  A pair of outside air introduction holes 4 that penetrates the spout 2 a inward and outward along the radial direction are provided on the side (outer peripheral portion) of the spout 2 a of the outer layer body 2. These outside air introduction holes 4 are arranged at symmetrical positions with the axis of the spout 2a interposed therebetween. The outside air introduction hole 4 communicates between the outer layer body 2 and the inner layer body 3, and introduces outside air between the outer layer body 2 and the inner layer body 3 when the inner layer body 3 peels from the outer layer body 2. Can do.

  For example, a member such as a pouring cap, various nozzles, or a pouring pump provided with a pouring valve is attached to the pouring port 2a of the outer layer body 2, and the contents are poured through these members. It is. These members are screwed to a screw portion 2c provided at the spout 2a and fixed to the spout 2a, but may be fixed by other means such as an undercut.

  When such a delamination container 1 is equipped with a pour-out cap provided with a pour-out valve at the pour-out port 2a, the contents from the pour-out port 2a can be obtained by squeezing the body 2b of the outer layer body 2. Things can be poured out. When the outer layer body 2 is restored to its original shape after the contents have been poured out, the outside air flows between the outer layer body 2 and the inner layer body 3 from the outer air introduction hole 4. The outer layer body 2 can be restored to the original shape while the volume is reduced. Therefore, even if the contents are poured out, outside air does not flow from the spout 2a into the accommodating portion 3b of the inner layer body 3, so that the contents accommodated in the accommodating portion 3b are not exposed to the air. Deterioration is prevented. In addition, when a pouring cap equipped with a ball valve is attached, the contents accommodated in the accommodating portion 3b of the inner layer body 3 can be poured out from the spout 2a by its own weight by tilting the outer layer body 2. . In addition, when a pump is attached to the spout 2a, an outer layer 2 that does not have flexibility can be used.

  A method for manufacturing a double container according to the present invention suitable for manufacturing a double container such as the above-described delamination container 1 will be described below by way of example. First, in the molding step, an outer layer parison for an outer layer made of a synthetic resin having low compatibility and an inner layer parison for an inner layer are coextruded to form a laminated parison. Thereafter, when this laminated parison is blow-molded using a mold, a structure in which the inner layer body 3 is peeled and laminated inside the outer layer body 2 is formed. At this point, the inner layer body 3 is in close contact with the inner surface of the outer layer body 2 as shown in FIG. Furthermore, the outside air introduction hole 4 is provided in the outer layer body 2 in the molding process. The method for providing the outside air introduction hole 4 is not particularly limited. For example, a pinch-off at the bottom formed by blow molding may be used, or a punch cutter may be provided at the spout 2a or the body 2b of the outer layer body 2 after blow molding. Alternatively, the holes may be formed by melting means.

  Thereafter, air is pumped from the outside air introduction hole 4 or the inner layer body 3 is contracted by negative pressure suction so that the whole except the opening 3a is peeled off from the outer layer body 2 as shown in FIG. Perform the process. After the peeling step, as shown in FIG. 1 (d), a pressing step is performed in which the outer layer body 2 is elastically deformed by applying a pressing force from the outside of the outer layer body 2 with the pressing jig 5 or the like. Furthermore, a restoration process is performed to restore the inner layer body 3 toward the deformed outer layer body 2 by sending air into the inner layer body 3 in a state in which the pressing force is applied to the outer layer body 2. Since the shape of the elastically deformed outer layer body 2 does not match the shape of the restored inner layer body 3, as shown in FIG. 1 (e), the outer layer body 2 and the inner layer body 3 restored by the restoring step A space (gap) S communicating with the outside air introduction hole 4 is formed between the two. In this example, the pressing step is performed after the peeling step, but the peeling step can be performed simultaneously with the pressing step. In other words, a pressing force is applied from the outside of the outer layer body 2 by the pressing jig 5 to elastically deform the outer layer body 2, and air is pumped from the outside air introduction hole 4 or the inner layer body 3 is contracted by negative pressure suction. The outer layer body 2 may be peeled off.

  In the delamination container 1 manufactured by the above manufacturing method, after the contents are accommodated in the inner layer body 3, when the contents are poured out from the spout 2a, the space S serves as an air flow path, so that the outside air is introduced. Outside air can be introduced from the hole 4 to allow the outside air to easily flow between the outer layer body 2 and the inner layer body 3 in the trunk portion 2b (and the bottom portion). Thereby, the inner layer body 3 can be easily peeled off from the outer layer body 2, and the peeling failure of the inner layer body 3 of the laminate peeling container 1 and the deformation of the outer layer body 2 without being restored to the original shape can be prevented. . Moreover, according to this manufacturing method, since the outer layer body 2 is elastically deformed in the pressing step and then the shape is restored, no change in appearance is observed in the portion to which the pressing force is applied.

  A method for manufacturing a double container as another embodiment of the present invention will be described below by way of example. In the manufacturing method of the lamination peeling container 21 in this embodiment, after carrying out blow molding and providing the outside air introduction hole 4, a peeling process is performed similarly to said manufacturing method. Then, as shown in FIG. 2B, the outer layer body 2 is plastically deformed by heat by pressing the outer layer body 2 with a heated pressing jig (such as a pressing pin) 5 '. In addition, similarly to said manufacturing method, a peeling process can also be performed simultaneously with a press process. As shown in FIG. 2C, a recess 6 is formed in the outer layer body 2 after the pressing step. Then, after the pressing step, the inner layer body 3 is restored in the restoration step, thereby forming a space S between the outer layer body 2 and the inner layer body 3 around the recess 6 as shown in FIG. can do. Therefore, as in the above-described embodiment, the space S formed by this manufacturing method serves as an air flow path, and the outside air flowing in from the outside air introduction hole 4 easily flows between the outer layer body 2 and the inner layer body 3. can do. FIG.2 (e) is a perspective view of the lamination peeling container 21 in which the recessed part 6 was formed by the press process. In the previous manufacturing method, the outer layer body 2 was designed to restore the shape of the pressed portion by releasing the pressing force. However, in this manufacturing method, the shape of the recess 6 is not changed even if the pressing force is released. Since the restoration is not performed, it is not necessary to simultaneously apply the pressing force and the restoration process of the inner layer body 3.

  A method for manufacturing a double container as still another embodiment of the present invention will be described below by way of example. In the manufacturing method of the lamination peeling container 31 in this embodiment, first, as shown to Fig.3 (a), it blow-molds so that the outer-layer body 2 before performing a press process may have the convex shape 7. FIG. Thereafter, a peeling process is performed (see FIG. 3B). Further, in the pressing process, a pressing force is applied with a pressing jig (not shown) or the like, so that the convex shape 7 has a concave shape 7 as shown in FIG. Invert and deform to become '. In addition, similarly to said manufacturing method, a peeling process can also be performed simultaneously with a press process. Thereafter, when the inner layer body 3 is restored in the restoration step, a space S is formed between the outer layer body 2 and the inner layer body 3 in the vicinity of the concave shape 7 ′. In the case of this manufacturing method, it is possible to push the convex shape 7 after the restoration step, and similarly, the space S can be formed between the outer layer body 2 and the inner layer body 3.

  Therefore, also in this manufacturing method, the outside air can be easily taken in between the outer layer body 2 and the inner layer body 3 from the outside air introduction hole 4 as in the above embodiment. Thereby, the inner layer body 3 can be easily peeled off from the outer layer body 2, and the peeling failure of the inner layer body 3 of the laminated peeling container 31 and the deformation of the outer layer body 2 can be prevented.

  Here, in the present invention, the position at which the pressing force is applied to the outer layer body 2 and the shape thereof are not particularly limited and can be set as appropriate, but are preferably in the vicinity of the outside air introduction hole 4. According to this, the space S formed between the outer layer body 2 and the inner layer body 3 can easily communicate with the outside air introduction hole 4, and the inflow of outside air into the space S can be made easier.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the pair of outside air introduction holes 4 is provided in the spout 2a. However, the number of outside air introduction holes 4 is not limited to two, and one or three or more can be provided. It can also be provided on the body 2b or the bottom other than 2a. Further, the double container of the present invention is not limited to a two-layer structure including only the inner layer body 3 and the outer layer body 2, and may have a multilayer structure including three or more layers including the inner layer body 3 and the outer layer body 2. Furthermore, the double container of the present invention can use a resin such as a light shielding material or a recycled material depending on the purpose of use of the container.

1 Delamination container (double container)
2 outer layer body 2a spout 2b trunk 2c thread 3 inner layer body 3a opening 3b housing 4 outside air introduction hole 5 pressing jig 6 recess 7 convex

Claims (4)

A method for producing a double container comprising a bottle-shaped outer layer body and an inner layer body that is detachably laminated inside the outer layer body,
Blow molding of an outer layer parison to be the outer layer body and a laminated parison formed by the inner layer parison to be the inner layer body, and forming an outside air introduction hole for introducing outside air between the outer layer body and the inner layer body Process,
After the molding step, a peeling step of peeling the inner layer body from the outer layer body,
A pressing step of deforming the outer layer body at least temporarily by applying a pressing force from the outside of the outer layer body;
A restoration step of restoring the inner body toward the outer layer body is deformed, only including,
After the restoration step, the pressing force is released to form a space between the outer layer body and the inner layer body . A method for producing a double container comprising a bottle-shaped outer layer body and an inner layer body that is detachably laminated inside the outer layer body,
Blow molding of an outer layer parison to be the outer layer body and a laminated parison formed by the inner layer parison to be the inner layer body, and forming an outside air introduction hole for introducing outside air between the outer layer body and the inner layer body Process,
After the molding step, a peeling step of peeling the inner layer body from the outer layer body,
A pressing step of deforming the outer layer body at least temporarily by applying a pressing force from the outside of the outer layer body;
Restoring the inner layer body toward the deformed outer layer body, and
The outer layer body before performing the pressing step has a convex shape protruding outward,
In the pressing step, the convex shape is reversed and deformed by a pressing force to form a space between the outer layer body and the inner layer body. The method for producing a double container according to claim 1 or 2, wherein the pressing step is performed after the peeling step. The manufacturing method of the double container described in Claim 1 or 2 which performs the said peeling process and the said press process simultaneously.

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