JP7199781B2 - delaminating container - Google Patents

Description

The present invention relates to delamination containers.

A stacked plastic container having an outer preform and an inner preform positioned inside the outer preform as a container for containing liquids such as food seasonings such as soy sauce, beverages, cosmetics, shampoos, rinses, and liquid soaps. An outer layer body having a cylindrical mouth and a bottomed cylindrical body connected to the mouth, and a cylindrical inner mouth and body arranged inside the mouth by blow molding the reform. A delamination container (delamination container) made of synthetic resin and formed in a double structure is known, which has an inner layer body provided with a volume-reducing and deformable storage portion detachably laminated on the inner surface of the .

Such a delaminating container is used, for example, as a squeeze-type pouring container combined with a pouring cap provided with a check valve, or as a pump-equipped container combined with a pump, and the body of the outer layer is squeezed. The content liquid can be poured out to the outside by (squeezing) or operating the pump. On the other hand, after the content liquid is poured out, outside air is introduced between the outer layer body and the inner layer body through the outside air introduction port provided in the outer layer body, thereby restoring or maintaining the original shape of the outer layer body. Only the accommodation portion of can be reduced in volume and deformed. Therefore, according to the delamination container, the content liquid contained in the containing portion of the inner layer body is discharged to the outside without being replaced with the outside air, so that the content liquid contained inside the inner layer body is exposed to the outside air. It is possible to reduce contact and suppress deterioration, deterioration, etc. of the content liquid.

As an example of such a delamination container, Patent Document 1 discloses a bottle-shaped container having a mouth portion, a body portion, and a bottom portion, and both the outer layer body and the inner layer body are made of polyethylene terephthalate (hereinafter abbreviated as PET) resin. A delaminated container is disclosed. In such a container in which both the outer layer and the inner layer are made of PET resin, the peel resistance of the inner layer with respect to the outer layer is high, and this tends to cause poor peeling. By providing a release agent layer composed of silicone oil or the like between the two, the separation resistance is reduced and the separation defect is prevented.

Japanese Patent No. 5168572

By the way, the bottom portion of the delamination container described in Patent Document 1 has an annular outer peripheral edge portion and a recess that is gently recessed toward the inside of the container and continues to the inner side of the outer peripheral edge. , and has a shape without unevenness in the circumferential direction.

When the bottom portion has such a simple shape without unevenness in the circumferential direction, the inner layer body is easily separated from the outer layer body at the bottom portion. When the inner layer on the bottom peels off in the process of pouring out the contents, it becomes possible to move to the mouth side, and the inner surfaces of the inner layer near the center in the height direction of the body come into contact with each other, and the contents are dispensed. There is a risk that the flow path may become narrow or closed. As a result, there is a problem that the content cannot be poured out to the end and tends to remain inside the container.

Therefore, the present invention makes it possible to reduce the residual amount of contents by suppressing the peeling of the inner layer at the bottom during the process of pouring out the contents and preventing the flow path of the contents from being clogged. An object of the present invention is to provide a delaminating container.

The present invention has been made to solve the above problems, and the delamination container of the present invention comprises:
an outer body having a mouth, a body and a bottom;
an inner layer body positioned inside the outer layer body;
a release agent layer formed between the outer layer body and the inner layer body,
The outer layer body and the inner layer body are made of polyethylene terephthalate resin,
The bottom portion has an annular outer peripheral edge portion and a central recessed portion that continues to the inside of the outer peripheral edge portion and is concave toward the inside of the container,
The central recessed portion is provided with detachment suppressing portions in the form of concave ribs or convex ribs that are evenly arranged at a plurality of locations in the circumferential direction,
The inner layer body is detachable from the outer layer body, and is in close contact with the detachment suppressing portion to prevent detachment from the outer layer body during the process of pouring out the contents ,
The releasing agent layer is characterized in that it is not provided in the region corresponding to the bottom portion.

In addition, in the delaminating container of the present invention, it is preferable that all the detachment suppressing portions are convex ribs.

Moreover, in the lamination peeling container of the present invention, it is preferable that the number of the peeling suppressing portions evenly arranged in the circumferential direction of the central recessed portion is an even number of 10 or less.

According to the present invention, it is possible to reduce the amount of residual contents by suppressing the separation of the inner layer at the bottom during the process of pouring out the contents and preventing the flow path of the contents from being clogged. A delaminated container can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which notches and shows a part of the delamination container which is one embodiment of this invention. 2 is a bottom view of the delaminating container shown in FIG. 1; FIG. FIG. 3 is a cross-sectional view of the bottom of the delaminating container shown in FIG. 2 taken along line AA.

Hereinafter, the present invention will be described more specifically by way of example with reference to the drawings.

A delamination container 1, which is an embodiment of the present invention shown in FIG. It's becoming Below, the case where the delaminating container 1 is used as a squeeze-type pouring container for containing a food seasoning or the like as a content liquid will be described.

In the present specification, claims and drawings, the vertical direction means the vertical direction when the lamination peeling container 1 is in an upright position as shown in FIG. 1, and the radial direction means the lamination A direction along a straight line that passes through the axis O of the peeling container 1 and is perpendicular to the axis O is meant.

The outer layer body 10 is a portion that constitutes the outer shell of the delamination container 1, and includes a mouth portion 11, a cylindrical trunk portion 12 that is integrally connected to the lower end of the mouth portion 11, and a bottom portion 13 that closes the lower end of the trunk portion 12. It has a bottle shape with

As shown in FIGS. 1 and 2, the mouth portion 11 has a cylindrical shape, and a male thread 11a is integrally provided on the outer peripheral surface thereof. The mouth portion 11 can be fitted with a spout cap (not shown) that is screwed onto the male thread 11a and has a spout.

The mouth portion 11 may be provided with an annular protrusion instead of the male thread 11a, and the pouring cap may be attached by engaging with the protrusion in an undercut shape by plugging. In this case, the mouth portion 11 is not limited to a cylindrical shape, and may be, for example, a square tube shape or an elliptical tube shape as long as it is cylindrical.

A pair of outside air introduction ports 14 are provided in the mouth portion 11 . The pair of outside air introduction ports 14 are elongated through-holes that penetrate the mouth 11 in the radial direction and extend in the circumferential direction. It is The pair of outside air introduction ports 14 communicate between the outer layer body 10 and the inner layer body 20 respectively, and the outside air can be introduced between the outer layer body 10 and the inner layer body 20 through these outside air introduction ports 14 . .

A neck ring 15 is integrally provided below the outside air introduction port 14 of the mouth portion 11 . The neck ring 15 extends in an annular shape over the entire circumference of the mouth portion 11 and protrudes radially outward from the outer peripheral surface of the mouth portion 11 .

The trunk portion 12 has a shoulder portion 12a and a trunk body portion 12b.

The shoulder portion 12 a is integrally connected to the lower end of the mouth portion 11 , gradually expands in diameter downward, and protrudes radially outward from the mouth portion 11 . The trunk body portion 12b is formed in a tubular shape having a substantially circular cross section, and its upper end is integrally connected to the lower end of the shoulder portion 12a. The bottom portion 13 is integrally connected to the lower end of the trunk body portion 12b and closes the lower end of the trunk body portion 12b.

The trunk body portion 12b has flexibility, and when it is squeezed, it can be elastically deformed and dented radially inward. It can restore itself. By configuring the barrel main body 12b to be elastically deformable by squeezing, when the delaminating container 1 is used as a squeeze-type pouring container, the pouring operation of the content liquid can be easily performed. At the same time, since the trunk main body 12b easily restores its original shape after the content liquid is poured out, outside air is reliably introduced through the outside air introduction port 14 between the outer layer body 10 and the inner layer body 20. , the function as the delaminating container 1 can be exhibited reliably.

The shoulder portion 12a is provided with a plurality of (18) concave ribs 19 extending in the vertical direction and arranged at equal intervals along the entire circumferential direction. 1 and 2, only one recessed rib 19 is labeled for convenience. By providing a plurality of recessed ribs 19 on the shoulder portion 12a, the inner layer body 20 can be easily separated from the outer layer body 10 at the shoulder portion 12a. It should be noted that a configuration in which the recessed rib 19 is not provided is also possible.

The bottom portion 13 has an annular outer peripheral edge portion 16 and a central recessed portion 17 that continues to the inner side of the outer peripheral edge portion 16 and is concave toward the inside of the container. The outer peripheral edge portion 16 of this example is annular and constitutes a flat ground contact surface. That is, by bringing the outer peripheral edge portion 16 into contact with a horizontal surface, the delamination container 1 can stand on its own in the erect posture shown in FIG.

The central recessed portion 17 is provided with peeling suppressing portions 18 in the shape of concave ribs or convex ribs that are evenly arranged at a plurality of locations in the circumferential direction. As shown in FIGS. 2 and 3, in this example, the convex rib-like peeling suppressing portions 18 are provided at four locations in the central recessed portion 17 in the circumferential direction at intervals of 90°. Note that all the peeling-suppressing portions 18 are not limited to the convex rib-like shape as in this example, and all the peeling-suppressing portions 18 may be concave rib-like. A rib-shaped separation suppressing portion may be provided together.

As shown in FIG. 3, the separation suppressing portion 18 of this example has a convex rib shape and protrudes outward (downward in FIG. 3) from the bottom surface 17a of the central recessed portion 17 toward the outside of the container. In addition, each of the peeling suppressing portions 18 of this example includes a top wall 18a extending substantially perpendicularly to the axis O, a central side wall 18b connecting the top wall 18a and the bottom surface 17a of the central recessed portion 17, a left side wall 18c, and a right side wall 18d. The left side wall 18c is a side wall located on the left side when viewed from the axis O side, and the right side wall 18d is a side wall located on the right side when viewed from the axis O side.

By providing such a separation suppressing portion 18 and forming unevenness in the central recessed portion 17, compared to the case where the central recessed portion 17 is composed of a gently curved surface or a flat surface without unevenness in the circumferential direction, the outer layer It becomes difficult to separate the inner layer body 20 from the body 10 . In the detachment suppressing portion 18 of this example, the central side wall 18b, the left side wall 18c, and the right side wall 18d are particularly greatly inclined with respect to the bottom surface 17a of the central recessed portion 17, so that the inner layer body 20 is separated from the outer layer body. It is easily held in close contact with 10, and peeling is less likely to occur. In addition, the shape of the separation suppressing portion 18 is not particularly limited.

The inner layer body 20 is laminated along the inner surface of the outer layer body 10 and configured to be peelable from the outer layer body 10 at least at the trunk portion 12 . The inner layer body 20 has, for example, an inner mouth portion arranged on the inner peripheral side of the mouth portion 11 of the outer layer body 10 and a housing portion connected to the inner mouth portion and arranged inside the trunk portion 12 and the bottom portion 13 . are doing. The inside of the storage portion is a storage space S for the content liquid, and the content liquid can be filled into the storage portion through the inner opening, and the content liquid stored in the storage portion can be discharged to the outside through the inner opening. can do.

As the content liquid is poured out, the containing portion can be deformed to reduce its volume (deformed to reduce the internal volume) while being peeled off from the inner surface of the body portion 12 . Accompanying the volume-reducing deformation of the accommodation portion, outside air is introduced between the outer layer body 10 and the inner layer body 20 from the outside air introduction port 14, so that the trunk body portion 12b can be accommodated while maintaining or restoring its original shape. Only the portion can be easily peeled off from the inner surface of the trunk portion 12, and the volume can be reduced and deformed. In the bottom portion 13 , peeling of the inner layer body 20 is suppressed by the action of the peeling suppressing portion 18 as described above.

Both the outer layer body 10 and the inner layer body 20 are made of polyethylene terephthalate resin (PET). By using polyethylene terephthalate resin for the outer layer body 10 and the inner layer body 20, respectively, the delaminated container 1 can be made lightweight and highly transparent. A release agent layer or the like formed of a release agent may be provided between the outer layer body 10 and the inner layer body 20 . Here, the peeling agent means a coating agent that is provided between the housing portion and the body portion 12 and that can reduce the peeling resistance of the housing portion to the body portion 12 . Silicon oil, for example, can be used as such a release agent, but the release agent is not limited to this.

The release agent layer may be provided on the entire area between the housing portion and the body portion 12, but it is preferable that the area corresponding to the bottom portion 13 is not provided with the release agent layer. That is, it is preferable that the release agent layer is provided only in the regions corresponding to the shoulder portion 12a and the body portion 12b, and not provided in the region corresponding to the bottom portion 13. FIG. According to this, when the body portion 12 is squeezed, the portion corresponding to the shoulder portion 12a and the body portion 12b of the housing portion is separated from the inner surface of the body portion 12, but the portion corresponding to the bottom portion 13 is removed from the body portion 12. The storage part is regularly contracted so as to be flattened from both sides of the body part 12 without being easily peeled off from the inner surface, whereby the residual amount of the content liquid can be more reliably reduced.

The delaminating container 1 having the above configuration is, for example, a stack having an outer preform made of synthetic resin (made of polyethylene terephthalate resin) for forming the outer layer body 10 and an inner preform positioned inside the outer preform. It can be formed by blow molding a preform.

Stacked preforms include, for example, a test tube-shaped outer preform and an inner preform formed by injection molding, respectively, and then the inner preform incorporated inside the outer preform, or a test tube-shaped inner preform. can be injection-molded with the outer preform using as an insert material. Moreover, as blow molding, for example, biaxial stretch blow molding can be adopted, but it is not limited to this. When a release agent layer is provided between the outer layer body 10 and the inner layer body 20, the release agent is applied to at least one of the inner surface of the outer preform and the outer surface of the inner preform when forming the stacked preforms. apply.

The delamination container 1 of the present embodiment having such a configuration can be configured as a squeeze container by attaching a pouring cap to the mouth portion 11 . In this case, the pouring cap includes, for example, an outside air check valve that allows outside air to enter the outside air introduction port 14 and prevents the outside air from flowing out from the outside air introduction port 14, and an inner opening. It is possible to use a structure having a content liquid check valve that allows the content liquid that has passed through to flow out to the outside and prevents the outside air from flowing back into the container.

In the delaminating container 1 configured as a squeeze container, when the body portion 12b of the outer layer body 10 is squeezed (squeezed), the containing portion is reduced in volume and deformed, and the content liquid is pushed out from the pouring cap and poured out. served. After the content liquid is poured out, when the barrel main body 12b is released from the squeeze, the barrel main body 12b tries to restore its original shape. 20, the storage portion of the inner layer body 20 is separated from the inner surface of the body portion 12 while the outside air is introduced, so that only the body portion 12b restores its original shape while the storage portion is reduced in volume and deformed. As a result, the content liquid stored in the storage section can be discharged without being replaced with the outside air, the contact of the content liquid stored in the storage section with the outside air can be reduced, and deterioration and deterioration of the content liquid can be suppressed.

Here, in the delaminating container 1 of the present embodiment, the plurality of peeling suppressing portions 18 are evenly arranged in the central recessed portion 17 of the bottom portion 13 in the circumferential direction. can increase the peel resistance to As a result, peeling of the inner layer body 20 at the bottom portion 13 during the process of pouring out the contents can be suppressed. As a result, it is possible to prevent the flow path of the contents from being clogged inside the inner layer body 20, so that the contents can be poured out to the end and the residual amount of the contents can be reduced. becomes.

From the viewpoint of suppressing peeling of the inner layer body 20 at the bottom portion 13 and enhancing the effect of reducing the amount of residual contents, the peeling suppressing portion 18 preferably has a convex rib shape. Furthermore, from the same point of view, it is preferable that the number of peeling suppressing portions 18 evenly arranged in the circumferential direction of the central recessed portion 17 is an even number of 10 or less. That is, by evenly arranging 2 to 10 peeling suppressing portions 18 in the circumferential direction, the peeling of the inner layer in the bottom portion 13 can be more effectively suppressed, and the shape of the bottom portion 13 becomes complicated. There is no fear that the moldability will be impaired due to excessive deformation. In the delaminating container 1 of the present embodiment in which the diameter of the bottom portion 13 is about 70 mm, a large delamination suppressing effect is obtained when two or four delamination suppressing portions 18 are installed, which is more preferable.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

Furthermore, in the above-described embodiment, the opening 11 is provided with a pair of outside air introduction ports 14, but at least one outside air introduction port 14 may be provided.

Furthermore, the outside air introduction port 14 is provided in the mouth portion 11 and is a through hole penetrating through the mouth portion 11, but is not limited to this and may be provided in the body portion 12 or the like.

Furthermore, the mouth portion 11 may be configured without the neck ring 15, and the shapes of the shoulder portion 12a, body portion 12b, and bottom portion 13 may be changed in various ways.

Furthermore, in the above-described embodiment, the delamination container 1 is a squeeze-type pouring device in which a pouring cap having a pouring port is attached to the mouth portion 11, and the body portion 12 is squeezed to pour out the content liquid. Although a case where it is used for a container has been shown, it is assumed that it is used for a pump-equipped container in which the body portion 12 has a predetermined rigidity that does not easily undergo squeeze deformation and a pump-type pouring tool is attached to the mouth portion 11 . can also

1: Delamination container 10: outer layer body 11: mouth portion 11a: male screw 12: body portion 12a: shoulder portion 12b: body body portion 13: bottom portion 14: outside air inlet 15: neck ring 16: outer peripheral edge portion 17: central depression Part 18: Peeling suppressing part 18a: Top wall 18b: Central side wall 18c: Left side wall 18d: Right side wall 19: Concave rib 20: Inner layer body O: Axial center S: Accommodating space

Claims (3)

an outer body having a mouth, a body and a bottom;
an inner layer body positioned inside the outer layer body;
a release agent layer formed between the outer layer body and the inner layer body,
The outer layer body and the inner layer body are made of polyethylene terephthalate resin,
The bottom portion has an annular outer peripheral edge portion and a central recessed portion that continues to the inside of the outer peripheral edge portion and is concave toward the inside of the container,
The central recessed portion is provided with detachment suppressing portions in the form of concave ribs or convex ribs that are evenly arranged at a plurality of locations in the circumferential direction,
The inner layer body is detachable from the outer layer body, and is in close contact with the detachment suppressing portion to prevent detachment from the outer layer body during the process of pouring out the contents ,
The delaminating container, wherein the release agent layer is not provided in a region corresponding to the bottom portion. The lamination peeling container according to claim 1, wherein all of the peeling suppressing portions are convex rib-shaped. The delamination container according to claim 1 or 2, wherein the number of said delamination suppressing portions evenly arranged in the circumferential direction of said central recessed portion is an even number of 10 or less.

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