JP3877354B2 - Packaging container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging container containing a liquid such as water-based ink, and more particularly to a packaging container having a stopper fitting type lid.
[0002]
[Prior art]
Conventionally, for example, as shown in Japanese Utility Model Publication No. 7-44605, a blank plate having a heat-adhesive resin layer on at least one outermost surface of a base material layer mainly composed of paper is used, and the blank plate is heated. The adhesive resin layer is turned inside and rolled into a hollow shape so that both side edges face each other to form a peripheral wall portion, and the lower end opening and both side edges of the blank plate are filled and the periphery of the upper opening is covered to be integrated with the blank plate. There is known a packaging container in which a skeleton member is formed of a synthetic resin and a bottom portion, a columnar portion, and an upper edge portion are formed by the skeleton member. This type of packaging container is called a pillared container, and is used as a container such as a detergent.
[0003]
[Problems to be solved by the invention]
Pillar containers are lighter and cheaper than metal containers and synthetic resin integral molded containers, and have the advantage of being easy to dispose of. Since it is inferior to the molded product, it is not easy to ensure the sealing property of the lid fitting portion. Therefore, in such a packaging container, ensuring the sealing performance of the lid fitting portion has been a problem.
[0004]
An object of this invention is to ensure the sealing property of the cover body fitting part of the packaging container which uses liquids, such as water-based ink, as a content.
[0005]
[Means for Solving the Problems]
The present invention is a packaging container having a stopper fitting type lid, and a fitting support wall that surrounds the upper edge of the container body around the upper edge of the container body at a substantially constant interval. A connecting portion for connecting the fitting support wall to the container main body, and an upper end projecting on the inner periphery of the upper edge of the fitting support wall to form a tapered guide surface and the lower end perpendicular to the axis of the container main body. A fitting portion comprising a plurality of substantially triangular fitting protrusions constituting a locking surface is provided, and the upper edge of the upper edge of the container body is fitted to the lid body in a sealed state on both the inner and outer sides. A fitting portion comprising a fitting groove portion to be fitted and an outwardly extending hook-shaped engagement hook portion extending outside the fitting groove portion and engaging with the fitting protrusion of the container body is provided, By applying a plugging force from above the container body, the upper edge of the upper edge of the container body fits into the fitting groove of the lid. In both cases, the engaging hook portion of the lid is guided by the guide surface at the upper end of the fitting protrusion of the container body, and is elastically deformed to fit under the fitting protrusion, and the tip of the engaging hook portion is the lower end of the fitting protrusion. A half-opening portion for opening the lid in a shape in which the fitting support wall is cut out at a portion above the coupling portion. By forming and applying a force that elastically deforms the engaging hook part of the lid using the half-opening part for opening, the tip of the engaging hook part comes into contact with the locking surface of the lower end of the fitting protrusion It is characterized in that the locked state can be released and the lid can be opened.
[0006]
In the packaging container of the present invention, when the lid is put on the container body and a stoppering force is applied from above, the top edge of the upper edge of the container body is fitted in the fitting groove of the lid and the lid is engaged. The hook part is guided by the guide surface at the upper end of the fitting protrusion, is elastically deformed and fits under the fitting protrusion, and the tip of the engaging hook part comes into contact with the locking surface at the lower end of the fitting protrusion to lock the hook As a result, the sealing performance when the content is a liquid such as water-based ink is secured.
[0007]
Further, the packaging container is formed with a half opening portion for opening in a shape in which a fitting support wall is cut out at a portion above the connecting portion in the fitting portion of the container body, and the opening half opening portion The lid can be pry open using, and when the lid fitted with the stopper is opened, it is possible to pry it open by inserting a flat screwdriver into the half-opening lid.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 4 show examples of packaging containers according to the present invention when the contents are water-based ink. 1 is a front view showing a half of the packaging container in cross section, FIG. 2 is a plan view showing a half of the packaging container in cross section, FIG. 3 is a plan view of a blank plate constituting the side wall of the packaging container, FIG. FIG. 2 is an enlarged detail view of a part C in FIG. 1.
[0009]
The packaging container 21 shown in this example includes a container body 22 having a substantially rectangular horizontal cross section and expanding in a tapered shape toward the upper end side, and a lid body 23 that is plugged into the upper opening of the container body 22. Is done.
[0010]
The container body 22 includes a side wall portion 22a constituted by the blank plate 25 of FIG. 3, and a bottom portion 22b, a columnar portion 22c and an upper edge portion 22d constituted by a skeleton member 26 which is a molded product of synthetic resin such as polypropylene. It is a Pillar container. A fitting portion 27 that is plugged into the lid 23 is formed on the outer periphery of the upper opening of the upper edge portion 22d constituted by the skeleton member 26. Further, the number of the columnar portions 22c is two, and the outer edge of the bottom portion 22b and the outer edge of the upper edge portion 22d are connected to each other at a position facing each other at the center of both short wall portions of the container main body 22.
[0011]
The blank plate 25 is made, for example, of paper and corona-treated aluminum (Al) having a thickness of about 7 μm, and polyethylene (PE) in a molten state between the paper and the corona-treated surface of aluminum (Al). After extruding and laminating, and further stretching laminated nylon (ON) with a thickness of 15 to 25 μm on the surface opposite to the corona-treated surface of aluminum (Al) by dry laminating (DL), a thermal adhesive resin is formed thereon. A layer of unstretched polypropylene (CPP) having a thickness of about 25 μm as a layer is also laminated by dry lamination (DL) (lamination structure: paper / extruded PE / corona / Al / DL / ON / DL / CPP), or Paper and stretched nylon (ON) having a thickness of 15 to 25 μm subjected to anchor coat (AC) treatment, and the surface of the paper and stretched nylon (ON) treated with anchor coat (AC) Polyethylene (PE) in a molten state is extruded and laminated between the two, and unstretched polypropylene (CPP) having a thickness of about 25 μm is dried on the surface of the stretched nylon (ON) opposite to the anchor coat (AC) treated surface. A laminate (DL) (lamination structure: paper / extruded PE / AC / ON / DL / CPP), which is cut into the shape of FIG. 3 and used. Further, unstretched polypropylene is suitable when the skeleton member 26 is polypropylene, and when the skeleton member 26 is another synthetic resin, the same material is used for the heat-adhesive resin.
[0012]
The stretched nylon has a tensile strength of 22 to 28 kgf / mm ² under the conditions of a temperature of 23 ° C. and a humidity of 65%, which is sufficient for reinforcing the blank plate 25. Instead of stretched nylon, other biaxially stretched films such as polyethylene terephthalate and polyethylene naphthalate having high tensile strength can also be used. The tensile strength of polyethylene naphthalate is 33 to 35 kgf / mm ² under the above conditions. The tensile strength of polyethylene terephthalate is 21 to 23 kgf / mm ² under the above conditions.
[0013]
When molding the container body 22, first, the blank 25 is wound around the male mold of the injection molding machine so that both side edges face each other with the heat-adhesive resin layer inside, and the male mold is held in that state by suction, for example. Insert into the mold and match the male and female molds. Then, with the male mold and the female mold combined, a thermoplastic synthetic resin such as polypropylene is introduced into the cavity between the male mold and the female mold via the male and female resin introduction portions. The skeleton member 26 constituting the bottom portion 22b, the columnar portion 22c and the upper edge portion 22d is integrally formed, and at the same time, the skeleton member 26 and the blank 25 are joined to form an integrally attached state.
[0014]
Further, as the thermoplastic synthetic resin constituting the skeleton member 26, other than polypropylene, any thermoplastic synthetic resin usually used for injection molding may be used. Other olefin resins, styrene resins, vinyl chloride resins, etc. Any thing may be used.
[0015]
The container body 22 molded in this way is easily joined to the skeleton member 26 made of a thermoplastic synthetic resin and the blank plate 25 having the same type of thermoadhesive resin layer on the outermost surface. The blank plate 25 has an increased tensile strength due to the biaxially stretched film layer interposed between the base material layer and the heat-adhesive resin layer. Therefore, it is possible to prevent the blank plate 25 from being broken at the joint between the blank plate 25 and the skeleton member 26 even when an impact is applied during dropping or the like.
[0016]
The fitting portion 27 on the outer periphery of the upper opening of the container body 22 is formed integrally with the skeleton member 26, and is a vertical fitting that surrounds the upper edge portion 22d of the container body 22 with a substantially constant interval. A support wall 27a is provided, and the fitting support wall 27a is connected to the upper edge portion 22d of the container body 22 by a horizontal connection portion 27b at substantially the center in the height direction. The upper end of the fitting support wall 27a has a substantially triangular cross-section with an upper end forming a tapered guide surface and a lower end forming a locking surface perpendicular to the axis of the container body 22. A plurality of joint protrusions 27c are provided in a predetermined arrangement. Further, in the horizontal connecting portion 27b, a portion that overlaps with the fitting protrusion 27c as seen in a plan view (FIG. 2) is a hole 27d that is slightly larger than the fitting protrusion 27c. As shown in FIG. 2, the fitting portion 27 is formed with a half-opening portion 27e for opening the lid in which the fitting support wall 27a is cut out at a portion above the horizontal connecting portion 27b. .
[0017]
The lid body 23 is a molded product of synthetic resin such as polypropylene, and a fitting portion 28 for fitting with a stopper is formed at the peripheral portion. Further, the top surface portion of the lid body 23 has a recessed shape so that the packaging container 21 can be stacked.
[0018]
The fitting portion 28 on the periphery of the lid body 23 is formed with a fitting groove 28a so that the upper end of the upper edge portion 22d of the container main body 22 is fitted, and the fitting portion on the container main body 22 side outside the fitting groove 28a. An engagement hook portion 28b having a hook shape in section and engaging with the fitting protrusion 27c of 27 is extended. When this lid 23 is placed on the container body 22 and a stoppering force is applied from above, the tip of the upper edge 22d of the container body 22 is fitted into the fitting groove 28a of the lid 23 and the lid 23 is engaged. The flange portion 28b is guided by the guide surface at the upper end of the fitting protrusion 27c, and is elastically deformed to fit under the fitting protrusion 27c. And the front-end | tip of the engagement collar part 28b contact | abuts to the latching surface of the fitting protrusion 27c lower end, and will be in a locked state. The lid 23 thus fitted with a stopper can be opened by inserting a flat screwdriver into the opening half-opening portion 27e.
[0019]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the packaging container which has a stopper fitting type lid body, the sealing performance in the case of using liquids, such as water-based ink, as a content can be ensured easily.
[Brief description of the drawings]
FIG. 1 is a front view of a half of a packaging container showing another example of an embodiment of the present invention in section.
FIG. 2 is a plan view showing a half of the packaging container shown in FIG. 1 in cross section.
3 is a plan view of a blank plate used for a side wall portion of the packaging container shown in FIG. 1. FIG.
4 is an enlarged detail view of a part C in FIG. 1. FIG.
[Explanation of symbols]
21 Packaging container 22 Container body 22a Peripheral wall part 22b Bottom part 22c Columnar part 22d Upper edge part 23 Cover body 25 Blank plate 26 Skeletal member 27 Fitting part (container body side)
27a Fitting support wall 27b Horizontal connecting portion 27c Fitting protrusion 27e Opening half-opening portion 28 Fitting portion (lid side)
28a Fitting groove 28b Engagement flange

Claims (1)

A packaging container having a cap-fitting type lid, and a fitting support wall surrounding the upper edge of the container body around the upper edge of the container body at a substantially constant interval, and the fitting A connecting portion for connecting the mating support wall to the container main body, a guide surface having a tapered upper end protruding from the inner periphery of the fitting support wall, and a lower end perpendicular to the axis of the container main body A fitting portion comprising a plurality of substantially triangular fitting protrusions constituting a locking surface is provided, and the upper end of the upper edge of the container body is sealed on the inner peripheral side and the outer peripheral side of the lid body. A fitting portion comprising a fitting groove portion to be fitted, and an outwardly hook-like engagement hook portion extending outside the fitting groove portion and engaging with the fitting protrusion of the container body, By covering the container body with the lid body and applying a plugging force from above, the upper edge of the upper edge of the container body is attached to the lid body. In addition to being fitted in the mating groove, the engagement flange portion of the lid is guided by the guide surface at the upper end of the fitting protrusion of the container body, and is elastically deformed to fit under the fitting protrusion, and the engagement The front end of the flange is brought into contact with the locking surface of the lower end of the fitting protrusion so as to be in a locked state. By forming a notch-opening half-opening portion and applying a force that elastically deforms the engaging hook portion of the lid using the opening-opening half-cutout portion, A packaging container characterized in that the lid can be pry open by releasing the locked state in which the tip of the portion is in contact with the engaging surface of the lower end of the fitting protrusion .

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