JP2000219233A - Molded peripheral frame-attached vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a peripheral frame from removing of the vessel main body even in the case of separating a lid member from the peripheral frame and opening and closing a cap by forming the peripheral frame of a vessel main body from a fitting part and flange part, and forming projection stripes on the inside of a lower surface of the flange part and projection stripes on the upside of an outer surface of the fitting part respectively. SOLUTION: The lamination material of a vessel main body is a thermoplastic resin layer having a paper layer as a base material and also having a barrier property. In addition, the innermost surface layer of the vessel main body is a thermoplastic resin layer capable of being thermal welded with a peripheral frame 10. Furthermore, the upper peripheral part of the vessel main body is bent to expand outward, and the peripheral frame 10 is welded through supersonic wave on the upper periphery. Herein, the peripheral frame 10 is injection molded with thermoplastic resin in order to be formed of a fitting part 12 continuous to the flange part 11 in a manner being bent inside thereof; subsequently, the fitting part 12 is put in close contact with the inner surface of a peripheral part of the vessel main body. Finally, each projection stripe 13, 14 to be welded on the inner surface of an upper periphery of the vessel main body respectively through ultrasonic wave is formed on the entire circumference or at predetermined distances on the inside of a lower surface of the flange part 11 and the upside of an outer surface of the fitting part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container with a molded edge frame used for beverages, powders, confectioneries, foods stored for a long time, and the like.

[0002]

2. Description of the Related Art In general, a paper container such as a paper cup has a step at an upper edge portion of a container body due to a joining portion formed when the container is formed into a cylindrical shape. When trying to seal the container by sealing the part, it was difficult to fill the step with a lid material to obtain a sealing property. Therefore, conventionally, in order to obtain high sealing performance with such a paper container, at least the inner surface of the container body is formed of a thermoplastic resin layer, and the upper edge of the container body is formed of a similar thermoplastic resin. A container obtained by ultrasonically welding an edge frame is disclosed in, for example, Japanese Patent Publication No. 1-17929.

According to the conventional container disclosed in Japanese Patent Publication No. 17929/1990, the upper edge of the container body is covered with the edge frame, so that there is no step and the upper surface of the flange of the edge frame is flat. Therefore, if the lid material is sealed on the upper surface of the flange, the container can be easily sealed. The edge frame is composed of a flange portion and a fitting portion that is bent approximately 90 degrees inside the flange portion and is continuous,
Only one of the lower surface of the flange and the outer surface of the fitting portion is ultrasonically welded to the upper edge of the container body. It is desirable that both the lower surface of the flange portion and the outer surface of the fitting portion are completely welded and attached to the upper edge portion of the container body, but in reality it is impossible due to insufficient output of the ultrasonic transmitter. In general, only one of them is welded.

[0004]

However, the container is sealed by sealing a lid in the form of a laminated sheet on an edge frame in which only one of the lower surface of the flange portion and the outer surface of the fitting portion is ultrasonically welded. When the lid is peeled off from the edge frame at the time of unsealing, there is a possibility that a problem that the edge frame may be removed from the container body when the lid is peeled off. Furthermore, even when a cap to be fitted to the edge frame is provided, opening and closing the cap many times may cause a problem that the edge frame is similarly removed from the container body. . Therefore, the present invention is to remove the lid material in the form of a laminated sheet from the edge frame and open it, or to open and close the cap to be fitted to the edge frame many times, so that the edge frame can be removed from the container body. It is an object of the present invention to obtain a container with a molded rim frame in which no rim is formed.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides the following container with a molded edge frame. That is, in a container obtained by ultrasonic welding an edge frame formed of a thermoplastic resin to an upper edge portion of a paper container body having an inner surface formed of a thermoplastic resin layer, the edge frame has a fitting portion and a flange. And a ridge is formed over the entire inner surface on the lower surface of the flange portion, and a plurality of vertically long ridges are formed at predetermined intervals on the upper outer surface of the fitting portion. This is a container with a molded edge frame. In addition, it is preferable that the number of the vertically long ridges formed on the outer surface upper side of the fitting portion of the edge frame is eight or more. Also,
The vertically elongated ridge formed on the outer surface upper side of the fitting portion of the edge frame is characterized by being formed in a substantially triangular shape in a side view in which the lower side has a minimum angle, and a flange of the edge frame. A ridge is formed over the entire outer periphery of the lower surface of the portion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. However, the present invention is not limited to those shown in the drawings, but falls within the spirit of the present invention. , The design can be changed as appropriate. 1 is a schematic perspective view showing the entire container according to the present invention, FIG. 2 is a partially cutaway front view of an edge frame, FIG. 3 is a bottom view of the edge frame, and FIG. 4 is an enlarged cross section showing a main part of the edge frame. FIG. FIG. 5 is an explanatory view showing how the edge frame is ultrasonically welded to the container body.
FIG. 4 is an explanatory view showing a state in which a cap is attached to a container body sealed with a lid material. The container of the present invention contains alcohol,
It can be widely used for beverages such as juices, powders such as coffee and creaming powder which need fragrance retention, and solid confectionery such as potato chips and chocolate.

First, the container body (1) to which the edge frame is attached will be described. The laminated material of the container body (1) is made of polyethylene, polypropylene, polyethylene terephthalate, polyamide, ethylene vinyl based on a paper layer. A thermoplastic resin layer such as an alcohol copolymer,
If necessary, a metal foil layer such as an aluminum foil, a metal deposited film layer obtained by depositing aluminum, silicon oxide, aluminum oxide, etc. on a base film such as a polyethylene terephthalate film, an inorganic oxide deposited film layer, etc. It has the property. At least the innermost layer of the container body (1) is formed of a thermoplastic resin layer that can be thermally welded to an edge frame (10) described later.

A skive hemming process is performed on one side end of the blank plate having such a layer structure, and is formed into, for example, a cylindrical cup shape having a tapered shape with a wide upper and lower sides, and the side ends are joined. At the same time, the bottom member is joined to form a container body (1) as shown in FIG. The upper edge (2) of the container body (1) is bent so as to expand outward, and the edge frame (10) is set on the upper edge (2) and ultrasonically welded. It has become. The shape of the container body (1) is not limited to the illustrated one, but may be formed into, for example, a prism. Further, the upper edge portion (2) of the container body (1) may be curled outward or inward.

Next, the edge frame (10) will be described. The edge frame (10) is injection-molded with a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate or the like. As shown by reference numeral 4, a flange portion (11) and a fitting portion (12) which is bent approximately 90 degrees inside the flange portion (11) and is integrally continuous therewith. The fitting portion (12) is formed in a shape that can be in close contact with the inner surface of the upper edge portion (2) of the container body (1). Like the upper edge portion (2) of the container body (1) described above, it is formed in a tapered shape so that the lower side is narrowed in a side view.

A ridge (13) for ultrasonic welding to the inner surface of the upper edge (2) of the container body (1) is formed all around the lower surface inside the flange (11), A plurality of projections (14) for ultrasonic welding are formed on the inner surface of the upper edge (2) of the fitting portion (12) on the outer surface of the fitting portion (12) at predetermined intervals. Protrusions (13) of this collar (11)
Is formed in a substantially equilateral triangular shape in cross section as shown in FIG. 4, and the ridge (14) of the fitting portion (12) is vertically elongated and has a substantially triangular shape in side view such that the lower side has a minimum angle. It is formed in a shape.

As described above, the ridge (1) of the fitting portion (12) is used.
If 4) is formed in a vertically elongated substantially triangular shape such that the lower side has the minimum angle, the inner surface side of the upper edge portion (2) of the container body (1) expanding in a tapered shape, that is, the bent portion Directly contact the protrusion (14), and it is easy to transmit the ultrasonic vibration at the time of ultrasonic welding, so that the weldability can be improved. In order to strengthen the welding of the edge frame (10) to the container body (1), it is found from the results of the experiment that the fitting portion (12) is inserted into the upper edge (2) of the container body (1).
Is required to be welded at a plurality of places at equal intervals. Therefore, in the present invention, the number of the protrusions (14) formed on the fitting portion (12) is preferably eight or more. is there.

A wide ridge (15) is formed over the entire outer periphery of the lower surface of the flange (11), and the entire portion is formed thick. This ridge (1
5) is a ridge (1) formed inside the lower surface of the flange (11) when the edge frame (10) is ultrasonically welded to the container body (1).
3) and ridges (1) formed on the upper outer surface of the fitting portion (12).
4) is melted to prevent the resin body from protruding from between the upper edge portion (2) of the container body (1) and the flange portion (11) of the edge frame (10). I have. In addition, on the lower side of the inner surface of the fitting portion (12), a ridge (16) having a substantially semi-circular cross section is formed over the entire circumference, and when the container body (1) is stacked and stocked,
It can be easily extracted one by one without blocking.

The above-described edge frame (10) is ultrasonically welded to the upper edge (2) of the container body (1).
As shown in FIG. 5, an ultrasonic horn (3) conforming to the shape of the edge frame (10) is used. That is, a horn (3) having a shape capable of simultaneously contacting at least the inside of the upper surface of the flange (11) and the inside of the fitting portion (12) is used, and the upper edge (2) of the container body (1) is used. (4) and its horn (3) to make contact with the outer frame (1).
0) is ultrasonically welded to the container body (1). Specifically, the ultrasonic vibration from the ultrasonic transmitter is transmitted by the horn (3), and the ridges (13) and (14) formed on the flange portion (11) and the fitting portion (12) of the edge frame (10), respectively. The container body (1)
The ridges (13) and (14) are slid and brought into contact with the inner surface of the upper edge portion (2) by the frictional heat so that the ridges (13) and (14) are melted and welded.

Thus, the upper edge (2) of the container body (1)
Attach the edge frame (10) to the flange (1) of the edge frame (10).
By heat-sealing a thin laminated sheet-like lid material (5) having a barrier property on the upper surface of 1), a container capable of sealing the above-mentioned contents is obtained.
Further, a cap (6) that can be fitted to the edge frame (10) may be provided so that the container can be sealed again after the lid member (5) is peeled off. This cap (6) is injection-molded with a resin such as low-density polyethylene so as to have flexibility, for example, and as shown in FIG.
The container can be sealed by engaging the outermost peripheral edge of the flange (11) of the edge frame (10) with the groove (8) formed over the entire inner surface of the lower edge (7). It has become.

The present invention relates to an edge frame formed of a similar thermoplastic resin on an upper edge portion (2) of a paper container body (1) such as a paper cup having at least an inner surface formed of a thermoplastic resin layer. When ultrasonic welding (10), the flange (1) of the edge frame (10) is used.
In addition to welding the entire inner surface of the lower surface of 1), ridges (14) having a vertically elongated special shape are formed at predetermined intervals on the outer surface of the insertion portion (12), and the insertion portion (12) is attached to the container. Since it can be partially welded to the upper edge portion (2) of the main body (1) in a dot-like manner, the edge frame (10) can be firmly welded to the container body (1), and the edge frame can be welded. Even when the lid material (5) is peeled off from the (10) or the cap (6) to be engaged and fitted to the edge frame (10) is repeatedly opened and closed many times, the container body ( Since the adhesive strength to 1) is sufficiently ensured, there is no problem that the edge frame (10) can be removed from the container body (1).

Originally, it is desirable to weld the entire upper surface of the fitting portion (12) entirely, but this is not possible due to insufficient output of the ultrasonic transmitter, and only the upper outer surface of the fitting portion (12) is required. When welding is performed over the entire surface, the balance of ultrasonic welding is difficult and not practical. However, if the welding of the fitting portion (12) is partial welding instead of the entire surface, the output of the ultrasonic transmitter does not become insufficient, and the bonding strength of the edge frame (10) to the container body (1) is improved. Therefore, the present invention is very effective in such cases as described above. In addition, since the container is made of paper, there is an advantage that the container is excellent in disposal.

[0017]

Next, a specific embodiment will be described. The container body (1) has a polyethylene layer / printing layer / paper layer /
A paper cup formed by skiving and hemming a blank plate composed of an aluminum foil layer / polyethylene terephthalate layer / polyethylene adhesive resin layer and bending the upper edge (2) outward. The edge frame (10) was produced by injection molding a blend of high density polyethylene and low density polyethylene at a specific ratio. The edge frame (1
The angle of the taper in the fitting portion (12) of 0) is 8 degrees, and the minimum angle of the vertically long ridge (14) formed in the fitting portion (12) and having a substantially triangular shape in side view is 6 degrees.

Then, an edge frame (10) is set on the upper edge portion (2) of the container body (1), and an ultrasonic wave having a predetermined frequency and amplitude is transmitted from an ultrasonic transmitter, and the horn (3) and The edge frame (10) was welded to the container body (1) with the retainer (4). After filling the resulting container with creaming powder, the lid (5) was heat-sealed on the upper surface of the edge frame (10), and a cap (6) was fitted to obtain a product form. The minimum bonding strength of the edge frame (10) to the container body (1) is generally required to be about twice as large as when the lid material (5) is peeled off and opened, but according to the present invention,
The peel strength of the lid material (5) is 2 kg / cm ² ,
The adhesive strength of the edge frame (10) to the container body (1) is 4k
g / cm ² or more was obtained.

[0019]

As described above, according to the present invention, an edge frame formed of a thermoplastic resin is ultrasonically welded to the upper edge of a paper container body having an inner surface formed of a thermoplastic resin layer. In the container, the edge frame is formed of a fitting portion and a flange portion, and a ridge is formed on the entire inner surface on the lower surface of the flange portion, and a vertically long ridge is formed at predetermined intervals on the upper outer surface of the fitting portion. Since a plurality of the frames are formed, the adhesive strength of the edge frame to the container body can be improved. In particular, it is preferable that the number of the vertically long ridges formed on the outer surface upper side of the fitting portion of the edge frame is eight or more.
Further, since the vertically long ridge formed on the outer surface upper side of the fitting portion of the edge frame is formed in a substantially triangular shape in a side view in which the lower side has a minimum angle, it is in close contact with the upper edge of the container body, The weldability of ultrasonic welding can be improved. Further, since the ridge is formed on the entire outer periphery of the lower surface of the flange portion of the edge frame, it is possible to prevent the resin from leaking from between the upper edge portion of the container body and the flange portion of the edge frame.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the entire container according to the present invention.

FIG. 2 is a partially broken front view of an edge frame.

FIG. 3 is a bottom view of an edge frame.

FIG. 4 is an enlarged sectional view showing a main part of the edge frame.

FIG. 5 is an explanatory view showing a state in which an edge frame is ultrasonically welded to a container body.

FIG. 6 is an explanatory view showing a state where a cap is attached to a container body sealed with a lid material.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 2 Upper edge part 3 Horn 4 Retainer 5 Lid material 6 Cap 7 Lower edge part 8 Groove part 10 Edge frame 11 Flange part 12 Fitting part 13-16 Ridge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Hirayama 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. No. 1 Inside Dai Nippon Printing Co., Ltd.

Claims (4)

[Claims] 1. A container obtained by ultrasonically welding an edge frame formed of a thermoplastic resin to an upper edge portion of a paper container body having an inner surface formed of a thermoplastic resin layer, wherein the edge frame is fitted. And a flange portion, a ridge is formed all around the lower surface inside the flange portion, and a plurality of vertically long ridges are formed at predetermined intervals on the outer surface upper side of the fitting portion. A container with a molded rim. 2. The container with a molded edge frame according to claim 1, wherein the number of the vertically long ridges formed on the outer surface upper side of the fitting portion of the edge frame is eight or more. 3. A vertically elongated ridge formed on an upper side of an outer surface of the fitting portion of the edge frame is formed in a substantially triangular shape in a side view with a lower side having a minimum angle. 2
4. The container with a molded edge frame according to 1. 4. A ridge is formed over the entire circumference on the outside of the lower surface of the flange of the edge frame.
A container with a molded edge frame according to any one of claims 1 to 3.