JPH0526045Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sealed resin container, and more specifically, to a hard resin sealed container used mainly for storing and preserving foods and the like.

(Prior Art) In general, containers used for storing and preserving foods, etc. (hereinafter referred to as food containers) meet the practical demand of making it possible to observe the condition of stored foods.
Alternatively, for aesthetic reasons, it is preferable to manufacture the container body from a hard resin with good transparency.

Food containers are also required to have a tight seal between the container body and the lid in order to maintain the freshness of the food and prevent deterioration of the food.

For this reason, the transparency of the container body is ensured by molding the container body from hard resin, while the lid itself is fitted with a special seal fitting structure to ensure that the lid is tightly fitted to the container body. Ta.

For example, some commercially available plastic food containers are
It consists of a container body made of transparent hard resin, and a lid made up of three parts: a seal top made of polypropylene, a seal bottom made of polyethylene, and an upwardly protruding push button made of polypropylene. The lid is constructed such that when a push button is pressed, the seal bottom is pulled downward and its outer periphery is contracted, and when the push button is released, the outer periphery of the seam bottom is expanded.

[The problem that the idea attempts to solve]

In such food containers, when fitting the lid, the lid is inserted into the top opening of the container body while pressing the push button that protrudes upward, and then the push button is released and the lid, i.e., the seam bottom, is inserted into the container body. The outer periphery is brought into sealing engagement, and when the lid is removed, a push button is pressed to release the sealing engagement between the container body and the lid, and the lid is pulled up while the push button is pressed. Therefore, extremely complicated operations are required to attach and detach the lid.

In addition, although the above-mentioned lid, which is made up of three parts, can maintain a tight seal, it has a complicated structure and an increased thickness, and as a result, it is necessary to construct the lid so that it can be inserted quite deeply into the container body. However, this method had the disadvantage that the effective space occupied by the contents inside the container was narrowed.

Furthermore, because the push button protrudes upward, this type of sealed resin container has the disadvantage that it is difficult to stack it stably.

By the way, sealed resin containers for accommodating cartridges of roll film for cameras are widely used in practical use. Such sealed resin containers are generally molded from a soft elastic resin such as polyethylene or polypropylene, and the container body and the fitting portion of the lid, which has an outer diameter slightly larger than the inner diameter of the main body, are elastically flexed together. Therefore, the sealing performance of the container is ensured by a relatively simple seal fitting structure. However, when such a seal fitting structure is adopted for the above-mentioned food containers, the container body made of hard resin has little flex, and unlike when molded with soft resin, it is extremely difficult to cut out the mold during molding. There was a problem in manufacturing the container.

The present invention was developed in view of the current situation, and it meets the general conditions originally required for this type of general-purpose resin container, that is, it is suitable for mass production, easy to put in and take out the contents, and is excellent. In addition to meeting the basic requirements of having a good appearance, the container body is molded from a transparent hard transparent resin, the sealing performance between the container body and the lid is excellent, the lid can be easily opened and closed, and the structure An object of the present invention is to provide a resin sealed container having a simple seal fitting structure.

(Means for Solving the Problems and Their Effects) In order to achieve the above object, the present invention has a cylindrical shape that is molded from a transparent hard resin, has a bottom, smooth outer and inner wall surfaces, and is open at the top. A container body in the form of a container body, a seal ring formed in a ring shape from a hard resin and ultrasonically welded to the upper edge of the container body, a canopy formed from an elastic resin, and a cylindrical shape hanging from the periphery of the canopy. an annular projection is provided on the inner peripheral surface of the seal ring, and an outer peripheral surface of the lower end of the skirt portion of the seal lid has an outer diameter larger than the inner diameter of the annular projection. An annular protrusion is provided, the annular protrusion of the skirt portion comprising:
The seal ring is formed at a position that descends beyond the annular protrusion of the seal ring when the seal ring and the seal lid are fitted together, and the upper and lower parts of the annular protrusion of the seal ring are respectively formed in inclined walls that join to each other. the lower sloped wall connects to the lower surface of the seal ring such that the seal ring covers the skirt portion and has a height slightly greater than the height of the skirt, the seal ring is cylindrical; The present invention provides a resin sealed container having a shaped outer circumferential surface, and the outer circumferential contour of the lower edge of the seal ring matches the outer circumferential contour of the upper edge of the container body.

According to the above configuration of the present invention, since the container body has a cylindrical shape with smooth outer and inner surfaces, it is possible to smoothly cut out the container body when molding with hard resin. Therefore, the container body can be easily resin-molded using a transparent hard resin.

Further, the container body and the lid can be fitted in a sealed state by the seal ring provided on the upper edge of the container body and the cylindrical skirt portion hanging down from the periphery of the canopy.

Furthermore, since the seal ring essentially only has a sealing structure, it can be designed to the minimum necessary height, which not only makes it easier to remove the seal ring during molding, but also makes it easier to remove the seal ring from the mold. The seam with the container body can be positioned in an area fairly close to the upper edge of the container. Therefore, when the horn of the ultrasonic welding machine is brought into contact with the upper edge of the container, the maximum amount of ultrasonic energy can be transmitted to the seam. Therefore, in the container of the present invention, the joint can be ultrasonically welded reliably and neatly.

Furthermore, by separating the seal ring from the container body, only the seal ring can be made of opaque hard resin, which allows the skirt portion to be concealed from the outside, and the seam between the seal ring and the container body can be made from opaque hard resin. , it can be made inconspicuous without any special finishing. Moreover, the outer peripheral contour of the lower edge of the seal ring,
By matching the outer circumferential contour of the upper edge of the container body, the outer circumferential surface of the container can be made smooth, and the opening area of the upper opening of the container can be maximized to make it easier to take in and out the complicated contents. It is possible to set it to .

1 to 3, a seal ring 2 is ultrasonically welded to the upper edge of a container body 1 at a welding portion 4, and a seal lid 3 is fitted onto the seal ring 2. The container body 1 is made of a transparent hard resin, and is a smooth-surfaced cylinder with an annular protrusion 12 at the bottom and an open top.

The seal ring 2 is made of hard resin in a ring shape, and has an annular projection 5 protruding from its inner surface as shown in the enlarged cross-sectional view of FIG. Further, an upper inclined wall 8 is provided above the annular projection 5, and a lower inclined wall 9 is provided below.
It is equipped with

The seal lid 3 includes a central ceiling projection 7a with a flat top surface, an annular ceiling projection 7b with a flat top surface that is approximately concentric with and has the same height as the ceiling projection 7a, and a ceiling projection 7a.
It consists of a circular canopy 11 with an annular recess 7c between the annular ceiling projection 7b and a cylindrical skirt 10 extending downward slightly inside the outer periphery of the canopy, and is molded from elastic resin. Further, the skirt portion 10 is provided with an annular projection 6 on the lower outer surface. The outer diameter of the circular canopy 11 is slightly larger than the outer diameter of the seal ring 2, and the outer diameter of the annular projection 6 is made slightly larger than the inner diameter of the annular projection 5 of the seal ring 2. The outer surface of this annular protrusion 6 is an inclined surface that comes into close contact with the lower inclined wall 9 of the seal ring 2.

Therefore, as can be seen from FIGS. 2 and 3, when the seal lid 3 and the seal ring 2 are fitted together, the annular projection 6 of the seal lid 3 is located below the annular projection 5 of the seal ring 2, as described above. annular protrusion 6
The outer surface of the seal ring 2 can tightly and resiliently contact the lower inclined wall 9 of the seal ring 2. At this time, the upper surface of the seal ring 2 is in contact with the lower surface of the canopy 11 of the seal lid 3.

In order to fit the seal lid 3 into the seal ring 2, the seal lid 3 may be placed on the seal ring 2 and the ceiling protrusion 7a of the seal lid 3 may be pressed from above with fingers.

As the seal lid descends, the annular projection 6 is guided downwardly on the upper inclined wall 8, during which the annular projection 6 is elastically deformed together with the skirt portion 10 toward the inside of the container.

When the seal lid is further lowered, it passes over the annular projection 5 as described above, and the annular projection 6 and the skirt portion expand along the lower inclined wall 9, resulting in the state shown in FIGS. 2 and 3, that is, elasticity. A completely sealed fit is achieved. In other words, the upper slanted wall 8 of the seal ring 2 helps to perform the fitting operation smoothly, and the lower slanted wall 9 helps prevent the sealing lid 3 from falling off and prevents the sealing lid from falling off when there is a dimensional error in the manufacturing process. It also functions to maintain sealing performance.

Furthermore, in order to remove the seal lid 3, it is sufficient to pull up the outer peripheral portion of the seal lid 3.

As described above, the container body 1 is made separate from the seal ring 2, and the outer and inner circumferential surfaces are made into smooth cylindrical surfaces, and no annular protrusion is present here, making the mold-cutting work easier. Molding with resin becomes possible.

Further, an annular protrusion 5 is provided on the inner surface of the seal ring 2 that is welded to the container body 1, and slanted walls are provided above and below the annular protrusion 5, and the dimensions of the protrusion 5 are appropriately designed with respect to the dimensions of the outer protrusion 6 of the seal lid 3. By doing so,
Sealing performance can be maintained.

Furthermore, opening and closing operations of the seal lid 3 are easy.

Furthermore, since the ceiling protrusions 7a and 7b of the seal lid 3 are flat and do not have any upwardly projecting portions, they can be stacked. In addition, the outer periphery of the annular protrusion 12 integrally formed on the bottom of the container body 1 substantially matches the outer periphery of the annular recess 7c formed in the seal lid 3;
When stacking containers, since the annular protrusion 12 of another container is received in the annular recess 7c, it is possible to stably stack a plurality of containers.

Note that the welded portion 4 shown in FIG. 3 is shaped such that the upper protrusion of the container body 1 and the lower protrusion of the seal ring 2 engage with each other, but instead of this configuration, the welded portion 4 may be As shown in FIG. 4, an upward protrusion 4a may be formed on the container body 1, and a recess 4b may be formed on the lower end of the seal ring 2. in this case,
Since relative movement in the radial direction between the container body 1 and the seal ring 2 is restricted, positioning of the two is easy in the high frequency welding process.

(Effects of the invention) The above structure of the invention not only satisfies the requirements of being suitable for mass production, making it easy to put in and take out the contents, and having an excellent appearance. It is possible to provide a resin sealed container with excellent sealing performance between the main body and the lid, easy opening/closing of the lid, and a simple seal fitting structure.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the resin sealed container according to the present invention in a fitted state, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a partially enlarged sectional view of FIG. 2. FIG. 4 is a partially enlarged cross-section showing another embodiment of the welded portion shown in FIG. 3. FIG. 1...Container body, 2...Seal ring, 3...
Seal lid, 4... Welded portion, 5... Annular projection, 6...
...Annular projection, 7a... Ceiling projection, 7b... Annular ceiling projection, 7c... Annular recess, 8... Upper slanted wall, 9
... lower inclined wall, 10 ... skirt section, 11 ... canopy, 12 ... annular protrusion.

Claims (1)

[Claims for Utility Model Registration] A container body 1 molded from a transparent hard resin and having a cylindrical shape with an open top and a bottom and smooth outer and inner walls, and a ring made of an opaque hard resin. formed into a shape,
It has a seal ring 2 ultrasonically welded to the upper edge of the container body, and a seal lid 3 made of elastic resin and consisting of a canopy 11 and a cylindrical skirt part 10 hanging down from the periphery of the canopy, An annular projection 5 is provided on the inner peripheral surface of the seal ring, and an annular projection 6 having an outer diameter larger than the inner diameter of the annular projection 5 is provided on the outer peripheral surface of the lower end of the skirt portion of the seal lid. An annular protrusion 6 is formed at a position that descends beyond the annular protrusion 5 of the seal ring when the seal ring and the seal lid are fitted, and the upper and lower parts of the annular protrusion 5 of the seal ring are respectively formed into oblique walls 8, 9 joining each other, said lower oblique wall 9 being formed in said annular protrusion such that said sealing ring covers said skirt part and has a height slightly greater than the height of said skirt; 6 and connected to the lower surface of the sealing ring, the sealing ring having a cylindrical outer circumferential surface, the outer circumferential contour of the lower edge of the sealing ring being the outer circumference of the upper edge of the container body. A resin sealed container characterized by conforming to the contour.