JP2012153402A - Container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container whose barrier properties can be kept while being reduced in weight.SOLUTION: The container includes a cylindrical barrel 11 formed of a laminate film including a barrier layer 11a, a mouth 16 having a spout 15, and a header member 12 connected with the mouth 16 and having a peripheral wall 18 fixedly adhered to the upper end opening of the cylindrical barrel 11. The header member 12 is formed by blow molding and also formed into a layered structure including a barrier layer 12a. The barrier layers 11a and 12a at respective upper ends of the peripheral wall 18 of the header member 12 and the cylindrical barrel 11 radially overlap each other.

Description

  The present invention relates to a container.

  In the container for storing the contents, for example, as shown in Patent Document 1 below, the body has a body formed by rolling a film material into a cylindrical shape, and the upper end opening and the lower end opening of the body are formed. It is conceivable to reduce the weight by applying a configuration in which a ring member (lid member) formed by injection molding and a bottom plate member are respectively disposed.

JP 2006-36218 A

  However, in the conventional container described above, while reducing weight, for example, gas (oxygen, carbon dioxide, etc.), moisture such as moisture, light such as ultraviolet rays, or odor components of contents are prevented from being transmitted. There was room for improvement in enhancing barrier properties.

  Then, this invention was made | formed in view of the situation mentioned above, Comprising: The objective is to provide the container which can maintain barrier property, aiming at weight reduction.

In order to solve the above problems, the present invention proposes the following means.
The container according to the present invention is provided with a cylindrical trunk portion made of a laminated film including a barrier layer, a mouth portion where a spout is formed, and an upper end opening portion of the trunk portion which is connected to the mouth portion. A header member having a fixed shoulder portion, wherein the header member is formed by blow molding and has a laminated structure including a barrier layer, and the shoulder portion of the header member and the upper end portion of the trunk portion The barrier layers are overlapped in the radial direction.

Due to such a feature, the body portion is formed of a laminated film, so that the body portion can be thinned. Furthermore, since the header member is formed by being stretched by blow molding, the header member can be thinned.
As a result, the weight of the container can be reduced.
In particular, in the container according to the present invention, since the trunk portion and the header member have a laminated structure including a barrier layer, it is possible to maintain the barrier property while reducing the weight. As a result, the contents stored in the container can be prevented from being altered.
Moreover, since the barrier layers of the shoulder portion of the header member and the upper end portion of the trunk portion are overlapped in the radial direction, the barrier property can be reliably maintained.
Moreover, by forming the header member by blow molding, the thickness can be easily reduced as compared to the case of forming by header molding as in the prior art.

  According to the container according to the present invention, the barrier property can be maintained while reducing the weight.

It is a side view of the container in the embodiment of the present invention.

Hereinafter, bottles according to embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the container 1 according to the present embodiment includes a cylindrical body portion 11 and a cylindrical header member 12 provided at an upper end opening of the body portion 11. However, each central axis is disposed on a common axis. Hereinafter, this common axis is referred to as a container axis O, and in the container 1 described above, the header member 12 side along the container axis O is referred to as an upper side, and the side opposite to the header member 12 is referred to as a lower side. A direction perpendicular to the container axis O is referred to as a radial direction, and a direction around the container axis O is referred to as a circumferential direction.

The trunk | drum 11 is formed by rolling the laminated | multilayer film which consists of a laminated structure with which the barrier layer 11a and the main material resin layer 11b were piled up in the thickness direction to a cylinder shape. Among the laminated films used in the present embodiment, the main material resin layer 11b is a resin such as polyethylene (PE) or polypropylene (PP). In addition, the barrier layer 11a is a resin having a barrier property that restricts transmission of gas (oxygen, carbon dioxide, etc.), moisture such as moisture, light such as ultraviolet rays, odor components of contents, and the like. It is a resin appropriately selected according to the product. For example, when exhibiting a barrier property against gas, a nylon-based resin or an ethylene vinyl alcohol copolymer resin can be used. When exhibiting a barrier property against moisture, a cyclic polyolefin-based resin or the like can be used. For example, a resin layer or a colored resin layer containing an ultraviolet absorber may be used.
Moreover, the trunk | drum 11 has the seal | sticker part 13 by which a lower end opening part is inserted | pinched by radial direction.

  And the outer layer part which comprises the outer surface of the trunk | drum 11, and the inner layer part which comprises an inner surface are formed with the main material resin layer 11b mentioned above, The middle layer part pinched | interposed between these outer layer parts and inner layer parts is The barrier layer 11a is formed.

  The header member 12 is integrally formed by blow molding, and is provided continuously with a mouth portion 16 having a spout 15 for pouring the contents accommodated in the container 1 and a lower end of the mouth portion 16. Shoulder 17. In such a header member 12, the mouth portion 16 is a non-stretched portion that is not or hardly stretched during blow molding, and the shoulder portion 17 is a stretched portion that is stretched during blow molding.

The header member 12 has a laminated structure in which a barrier layer 12a and a main material resin layer 12b are stacked in the thickness direction. The barrier layer 12a and the main material resin layer 12b have the same layer configuration as the laminated film that constitutes the body portion 11 described above, and an outer layer portion that constitutes the outer surface of the header member 12, and an inner layer portion that constitutes the inner surface. Are formed by the main material resin layer 12b described above, and an intermediate layer portion sandwiched between the outer layer portion and the inner layer portion is formed by the barrier layer 12a. Further, the upper end opening edge of the header member 12 in the container axis O direction (the upper end edge of the mouth portion 16) is formed of the main material resin layer 12b over the entire circumferential direction so that the barrier layer 12a is not exposed to the outside. ing.
The barrier layer 12a is preferably provided at least on the shoulder portion 17 (extended portion), and the barrier layer 12a is disposed in the mouth portion 16 formed relatively thick according to the target barrier performance. You don't have to.

The mouth portion 16 described above has a male screw portion 19 formed on the outer peripheral surface, and a cap (not shown) is detachably screwed to the male screw portion 19. In addition, you may comprise not only the external thread part 19 but a cap so that attachment or detachment is possible by undercut fitting.
For this reason, the mouth portion 16 is formed to be relatively thick so as to have rigidity capable of mounting a cap.

The shoulder portion 17 includes an enlarged diameter portion 20 that gradually increases in diameter as it goes downward, and a peripheral wall portion 18 that is connected to the lower end of the enlarged diameter portion 20.
The peripheral wall portion 18 is formed in a cylindrical shape extending along the container axis O direction, and the upper end portion of the body portion 11 described above is thermally welded to the outer peripheral surface thereof. And each barrier layer 12a, 11a of the surrounding wall part 18 and the trunk | drum 11 is piled up in radial direction. The peripheral wall portion 18 is formed with a step portion 21 formed so that the outer diameter of the peripheral wall portion 18 is reduced over the entire circumference in the circumferential direction. The step portion 21 is for accommodating the upper end portion of the body portion 11, and the depth in the radial direction is formed to be equal to the thickness of the body portion 11 in the radial direction. Thereby, the outer peripheral surface of the container 1 is formed flush with the shoulder portion 17 and the trunk portion 11.

Next, the manufacturing method of the container 1 mentioned above is demonstrated.
First, the body 11 is formed. Specifically, the cylindrical trunk | drum 11 is formed by rounding the laminated | multilayer film which consists of a laminated structure mentioned above to a cylinder shape, overlapping both ends of one direction, and heat-welding. In addition, the trunk | drum 11 may be heat-welded mutually by abutting the both ends of one direction in a laminated | multilayer film.

  Subsequently, the header member 12 is formed. The header member 12 can be formed by employing various blow molding methods such as direct blow molding and biaxial stretch blow molding. For example, when direct blow molding is adopted, first, a cylindrical parison having a three-layer structure in which a barrier layer 12a is sandwiched between main resin layers 12b is extruded, and then the parison is molded with a mold. Blow molding by blowing air into the inside of the parison while sandwiched in the direction. Thereby, the bottomed cylindrical preliminary | backup member which followed the inner surface of the metal mold | die is formed by expanding a parison while extending in a radial direction. This spare member is formed by connecting the header member 12 described above and a bottom portion (not shown) that closes the lower end opening of the header member 12. In this case, of the header member 12, the shoulder portion 17 (the enlarged diameter portion 20 and the peripheral wall portion 18) is an extended portion that is extended during blow molding.

  When biaxial stretch blow molding is employed, a bottomed cylindrical preform having a three-layer structure in which a barrier layer 12a is sandwiched between main material resin layers 12b is first produced by injection molding. And after setting a preform in a metal mold | die, it blow-molds by blowing air in a preform. Thereby, a preform with a bottomed cylindrical shape following the inner surface of the mold is formed by expanding the preform while extending along both the axial direction and the radial direction. In this case as well, the shoulder portion 17 (the enlarged diameter portion 20 and the peripheral wall portion 18) of the header member 12 is an extended portion that is extended during blow molding.

  Next, the preliminary member formed by the blow molding described above is cut along the radial direction. Specifically, among the preliminary members, a portion corresponding to the header member 12 (the mouth portion 16, the enlarged diameter portion 20, and the peripheral wall portion 18) and a bottom portion (or a bottom portion and a trunk portion) are separated. Thereby, the header member 12 mentioned above can be obtained. That is, in the container 1 of this embodiment, only the part corresponding to the header member 12 is used among the preliminary members.

Then, the peripheral wall part 18 of the header member 12 and the upper end part of the trunk | drum 11 are heat-welded. Thereafter, the lower end opening portion of the body portion 11 is sandwiched in the radial direction and thermally welded to each other, thereby forming the seal portion 13 at the lower end of the body portion 11.
The container 1 mentioned above is completed by the above.

Thus, according to this embodiment, since the trunk | drum 11 was comprised by the laminated | multilayer film, thickness reduction of the trunk | drum 11 is attained. Furthermore, the header member 12 is formed by blow molding, and the extension portion (shoulder portion 17) of the header member 12 is used for the container 1, whereby the header member 12 can be thinned.
As a result, the weight of the container 1 can be reduced.

In particular, in the container 1 of this embodiment, since the trunk | drum 11 and the header member 12 become the laminated structure containing barrier layers 11a and 12a, barrier property can be maintained after achieving weight reduction. As a result, it is possible to suppress the contents contained in the container 1 from being altered. In this case, since the upper end edge of the header member 12 is formed of the main material resin layer 12b, the barrier layer 12a can be protected. Thereby, it can prevent that the barrier layer 12a and the main material resin layer 12b peel, and can maintain barrier property over a long period of time.
Moreover, since the barrier layers 11a and 12a of the shoulder part 17 (circumferential wall part 18) of the header member 12 and the upper end part of the trunk | drum 11 are piled up in radial direction, barrier property can be maintained reliably.

  Moreover, in the present embodiment, the header member 12 is formed by blow molding, so that the thickness can be easily reduced as compared with the case where the header member 12 is formed by injection molding as in the prior art.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

In the above-described embodiment, the case where the body portion 11 and the header member 12 are thermally welded has been described. However, the present invention is not limited to thermal welding. That is, the body 11 and the header member 12 may be joined by various welding methods such as high-frequency welding or ultrasonic welding, adhesion using an adhesive, or fusion.
In the above-described embodiment, the case where the container 1 is formed by a three-layer structure including the barrier layers 11a and 12a has been described. However, if the container 1 includes at least the barrier layer, two layers or four or more layers are formed. It may be a laminate.

Moreover, you may form the upper end edge of the opening | mouth part 16 so that the barrier layer 12a and the main material resin layer 12b may become flush | level. That is, the end surface (end edge) of the barrier layer 12a may be exposed from one or both of the upper and lower end surfaces (end edges) of the header member 12, or may be covered with the main material resin layer 12b.
Further, in the above-described embodiment, the description has been given of the case where the preliminary member formed by blow molding is used as the header member 12 from the mouth portion 16 to the peripheral wall portion 18 via the enlarged diameter portion 20. As long as at least a stretched part is included, the use range of the spare member can be appropriately changed.
In the above-described embodiment, the case where the lower end opening of the trunk portion 11 is closed as the seal portion 13 has been described. The lower end opening may be closed.

  In addition, it is possible to appropriately replace the components in the above-described embodiments with known components without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Container 11 ... trunk | drum 11a ... barrier layer 12 ... header member 12a ... barrier layer 15 ... spout

Claims (1)

A cylindrical body made of a laminated film including a barrier layer;
A mouth portion formed with a spout, and a header member that is connected to the mouth portion and has a shoulder portion fixed to the upper end opening of the trunk portion,
The header member is formed by blow molding and has a laminated structure including a barrier layer,
The container, wherein the barrier layers of the shoulder portion of the header member and the upper end portion of the trunk portion are overlapped in the radial direction.

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