JPH0443457Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a side wall structure of a container made of molded plastic material.

(Prior Art) In recent years, most household items are made of plastic, and tableware and other general containers are mostly made of injection molded plastic.

By the way, there are many types and diversification of containers, and there are some containers that only have the function of holding things in, while others, such as sushi okes and sashimi ware, have design elements as well as functions as containers. There are many things that need to be matched with elegance, depending on what is required and put into it. One of the qualities of this container is the thickness of its side walls, and containers with thicker side walls are generally used. When forming such a thick side wall on a container, the wall thickness itself can be made thicker, but this not only increases the material cost but also makes it necessary to make only the side wall thicker than the bottom plate and other parts. In injection molding, the outer surface shrinks due to temperature differences during cooling, resulting in unevenness or undulations, and also takes a long cooling time, reducing productivity. Therefore, the thick side wall is used as an apparent side wall in appearance, and the inside of the side wall is formed into a large cavity, which is covered with a lid so that the cavity cannot be seen. FIG. 8 shows an example of this, in which the side wall 1 is composed of an outer wall 2 and an inner wall 3, with a cavity 4 between the two walls 2 and 3, and a lid 5 from below.
is formed to close the cavity 4, and the outer wall 2 and inner wall 3 have substantially the same thickness as the bottom plate 6. Therefore, by forming the container in this way, it is possible to solve the above problems and obtain a high-quality container with a thick side wall 1, but conversely, the lid 5 is not inserted into the cavity 4. When washing with water, water enters through the gaps, and once the water enters, it cannot easily escape, causing problems such as rotting inside the cavity and emitting a bad odor.

(Purpose of this invention) In this way, when the side wall of a container is formed of an outer wall and an inner wall, and has a cavity in between, so that it has an apparent thickness, water entering through the gap in the lid becomes a problem. The present invention aims to solve this problem. That is, it provides a special structure that prevents water from entering into the large hollow side wall.

(Structure of the present invention) In order to solve the above-mentioned problems, the present invention is a container side wall structure constructed with the following features.

(1) As before, the side wall is composed of an outer wall and an inner wall, forming a cavity inside, and a core whose outer periphery is in close contact with the outer wall and inner wall is inserted and placed in the cavity. . However, depending on the form of the lid that holds the core, a core that comes into close contact only with the outer wall may be sufficient.

(2) Adhesive is applied to the contact surfaces between the outer periphery of the core and the outer and inner walls. In this case, it is preferable to form a slight taper or step on the cavity opening side of the outer periphery of the core so that the applied adhesive can accumulate in the boundary area between the two walls and the outer periphery of the core.

(3) A lid is provided to hold down the applied adhesive. The adhesive is applied to the boundary area between the core and the inner and outer walls, and even in this state, there is little possibility that water will enter the cavity through the boundary surface, but
It is not easy to apply the adhesive to the boundary area completely without any gaps, and even if the adhesive is applied without any gaps, partial gaps will occur when it dries. Furthermore, if the applied adhesive is visible from the outside, it may impair the appearance, so a lid is used to cover the core and sweep away the applied adhesive to every corner. Of course, the shape of the lid here is arbitrary and depends on the shape of the container body, and sometimes the lid can also serve as the bottom plate of the container.

Hereinafter, embodiments of the side wall structure of a plastic container according to the present invention will be described in detail with reference to the drawings.

(Example) FIG. 1 shows one form of the side wall structure of a container according to the present invention, in which 11 represents a side wall, 12 represents a bottom plate, and 13 represents a recess, and the side wall 11 represents an inner wall 14, an outer wall 14, and an outer wall. 15, and an upper wall 16, forming a large cavity 17 inside. Also, the bottom plate 12
has a slightly protruding leg 18, and the cavity 17
A lid 19 for closing the opening is fixed from the bottom side, and a core 20 is interposed in the upper part of the lid 19. By the way, FIG. 2 shows an enlarged view of part A of the lid 19, the core 20, and the outer wall 15. The core 20 is positioned by a step 21 formed on the inner surface 22 of the outer wall 15, and It is kept parallel to 12. Further, the opening side of the core 20 is a tapered surface 23, an adhesive 24 is applied on the tapered surface 23, a lid 19 is covered from below the core 20, and a portion protrudes upward from the lid 19. The edge 25 sweeps away the adhesive 24 applied on the tapered surface 23. Of course, the operations of inserting the core 20, applying the adhesive 24, and putting the lid 19 on are performed with the container body turned over, so in actual work, the state shown in FIG. 2 is reversed. Glue 2
4 is swept away into the gap 26 between the inner surface 22 and the outer peripheral surface of the core 20 and the gap 27 between the inner surface 22 and the edge 25.

In addition, as part A in FIG.
It is also possible to use the combination shown in FIG. 3 without forming the tapered surface 23, but in this case, the applied adhesive 24 does not accumulate in the area where the gap 26 exists, so that it is not necessary to form the tapered surface 23. More than 24 adhesives
Rather, the core form shown in FIG. 2 is preferable. That is, by forming the tapered surface 23 that is inclined toward the gap 26, the adhesive 24 applied on the tapered surface 23 automatically flows toward the gap 26, thereby sealing the gap 26. Therefore, only a small amount of adhesive 24 is required, but in the case of FIG. 3 where the tapered surface 23 is not formed, the edge 2
5, it becomes necessary to apply an extra amount necessary to be forced in.

FIG. 4 shows still another embodiment, in which the outer wall 1
5 and the lower end surface 29 of the core 20, a small tapered surface 30 is formed on the inner periphery of the lower end surface 28, and an adhesive 2 is applied between the lower end surface 28 of the core 20 and the tapered surface 23 of the core 20.
4 and apply the adhesive 24 on the top surface 31 of the lid 19.
is forced into the gap 26. On the other hand, the embodiment shown in FIG. 5 is a container in which a lid 19 for sealing the cavity 17 of the side wall 11 is integrally formed on the bottom plate 12.
It is also possible to make the side wall structure of the present invention into such a form.

The embodiment described above, that is, A in FIG.
Although the shapes of the parts have been explained, it is not always necessary to tightly attach the core 20 to both the outer wall 15 and the inner wall 14 of the side wall 11, and depending on the shape of the lid 19 that presses the core 20, The embodiment shown in FIG. 6 may be used. That is, in this embodiment, it is sufficient to prevent water leakage between the outer wall 15 and the outer wall 15. Furthermore, as a fixing means for the side wall 11 of the core 20, if the height of the side wall 11 is low without forming a step 21 on the inner surface 22 of the inner and outer walls 14 and 15, in other words, if the height of the side wall 11 is low, When forming the side wall of the lid attached to the container, the core 20 may be fixed by coming into contact with the upper end surface 32 of the cavity 17 as shown in FIG.

As described above, although the side wall structure of the plastic container according to the present invention is not limited to these embodiments, the following effects can be obtained.

(Effects) (1) The container side wall 11 is composed of an inner wall and an outer wall 15,
A large cavity 17 is formed in between, and the opening of the cavity 17 is not simply covered with adhesive, but a core 20 is interposed between the periphery of the core 20 and the inner surfaces 22 of the inner and outer walls. In some cases, the adhesive 24 applied to the boundary with the inner surface 22 of only the outer wall is washed away by the lid 19 and into the gap 26 between the core 20 and the inner surface 22 and the gap 27 between the edge 25 of the lid 19 and the inner surface 22. It is possible to completely prevent water from entering the cavity 17 from the outside by interposing it therein.

(2) By using the core 20, the adhesive 24 is stored at a predetermined boundary, preventing it from flowing into the cavity 17, and it is possible to completely seal the cavity 17 with a smaller amount of adhesive.

(3) Also, instead of applying adhesive to the periphery of the lid as in the past, adhesive is applied to the core 20 inserted into the cavity 17, and the adhesive 2
4 is preferable in terms of appearance since it does not flow out and flow out when the lid 19 is closed.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the container side wall structure according to the present invention and shows its cross section, Fig. 2 is an enlarged view of part A in Fig. 1, and Figs. 3 and 4 show other embodiments of part A. FIG. 5 shows an example in which a lid is integrally formed on the bottom plate, FIGS. 6 and 7 show still other embodiments, and FIG. 8 shows a conventional example. 11... side wall, 12... bottom plate, 13... recess,
14...Inner wall, 15...Outer wall, 16...Top wall, 1
7...Cavity, 18...Legs, 19...Lid, 20...
Core, 21...Ran, 22...Inner surface, 23, 30...
... Tapered surface, 24 ... Adhesive, 25 ... Edge, 2
6, 27...Gap, 28, 29...Lower end surface, 31
...Top surface.

Claims (1)

[Claims for Utility Model Registration] (1) In a container made of injection molded plastic material or a lid for the container, the side wall is composed of an inner wall, an outer wall, and a top wall to form a cavity inside, and the cavity is A side wall structure for a plastic container, characterized in that a core is inserted, an adhesive is applied to the boundary between the core and the inner surface of the wall, and the opening of the cavity is sealed with a lid via the adhesive. . (2) The side wall structure of a plastic container according to claim 1, wherein the core is inserted and fixed in substantially intimate contact with the inner and outer surfaces of the side wall. (3) The side wall structure of a plastic container according to claim 1, wherein the core is inserted and fixed only to the inner surface of the outer wall of the side wall in a substantially intimate state. (4) Paragraph 1 of the utility model registration claim, in which a tapered surface is formed on the opening side end surface of the core toward the outer periphery;
The side wall structure of the plastic container according to item 2 or 3. (5) The side wall structure of a plastic container according to claim 1, 2, 3, or 4, wherein the lid is integrally formed with the bottom plate of the container.