JPH0585569A - Airtight throw-away container - Google Patents

Abstract

PURPOSE:To obtain an airtight throw-away container. CONSTITUTION:The container 10 consists of a container body 11 provided with an opening part and a lid 12 for closing the opening part, the container body 11 and the lid 12 are freely joined together to close the container by a closing means 13 so shaped as to form an interlocking joint and an adhesive layer 15 is provided between the matching parts of such a joint.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetically sealed container, and more particularly to an airtight hermetically sealed disposable container.

[0002]

2. Description of the Related Art At present, a hermetic disposable plastic container comprising a plastic body having an opening and a plastic lid for closing the opening is used in the food service industry, It is well known that it is widely used in the food industry and the like because of its ease of use. As described above, the closed-type disposable plastic container having the above-described structure is widely used in each field, but the closed-type disposable plastic container of this type has a rough handling. It is also well known that when received, it is not always perfect to maintain the airtightness in the sealing engagement portion between the main body and the lid.

The cause of the loss of airtightness is to increase the airtightness between the opening of the main body forming the container and the respective engaging portions formed on the lid for closing the opening. Since the engaging portions of both of them are shaped only so as to be in tight engagement with each other (hereinafter, such engaging means is referred to as "morphological closing means"). ), If the contents contained in the container are fluid, for example, a drink, the small amount of this drink left in the engagement between the body of the container and the lid. It is well understood from experience that it is something that comes out through a gap.

Further, instead of closing the main body of the container with a removable lid, a closing member made of a plastic sheet is used, and this is adhered to the peripheral edge of the opening of the main body of the container with an adhesive, It is also practiced to open the container by peeling it off.However, even if the airtightness is maintained by this means, once the closure member is peeled off from the container body, it is sealed to the airtightness of the container body. It is also often experienced that re-use to hold is virtually impossible. As described above, a disposable hermetically sealed container made of a lid and a main body which are closed by a conventional morphological closing means, or a main body and a closing member made of a plastic sheet, particularly a plastic The container had a problem in air tightness.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been found out that conventionally known ones have a problem in airtightness, and a new hermetically sealed container having airtightness, which solves this problem, has been solved. Obtaining is a problem to be solved.

[0006]

In order to solve this problem, the present invention provides a hermetically-sealed disposable container comprising a main body and a lid, which can be closed by a morphological closing means. At the same time, an adhesive layer is interposed between the peripheral edge of the opening of the main body and the peripheral edge of the corresponding engaging portion of the lid that engages with the peripheral edge of the opening. It is characterized in that and are adhered to each other. In this case, it is generally desirable to apply the pressure-sensitive adhesive layer to the corresponding joint surface of the periphery of the engaging portion of the lid that is joined to the end surface of the periphery of the opening of the main body. Further, as the adhesive, by selecting an appropriate one according to the material of the main body and the lid, when the main body and the lid are in a sealing engagement state, the adhesive, from one side of the sealing engagement portion, Since it is possible to give a weak adhesive force to this side without transferring the glue to the other side, maintaining airtightness between the two sides,
It becomes possible to make sure.

As the adhesive, for example, acrylic resin and rubber (natural or synthetic) are generally good, but the optimum one is selected depending on the material of the container and the lid. That is, when the adhesive is applied to, for example, the sealing engagement portion of the lid, the adhesive needs to be firmly adhered to the lid and at the same time weakly adhered to the main body. It is important that the adhesive does not cause glue transfer. This is because when the adhesive applied to the lid side transfers the glue to the main body side, the adhesive touches the mouth of the person who drinks the contents such as drink contained in the main body, This is because it may cause contamination of the contents.

[0008] In order to prevent such adhesive transfer of adhesive, the adhesive is firmly adhered to the lid side.
It may be possible to perform a corona discharge treatment or a treatment with a surface treatment agent on the lid side, but such treatment not only complicates the working process but also increases the container price. Therefore, in the closed type disposable container, it is important to select an appropriate adhesive agent according to the material of the main body and the lid.

In the container according to the present invention, for example, polypropylene resin is suitable as the material of the main body, and polystyrene resin or polyester resin is suitable as the material of the lid. As these materials, composite materials using those resins are also suitable. This is based on the fact that various pressure-sensitive adhesives show strong adhesive force to polyester resin or polystyrene resin, but weak adhesive force to polypropylene resin. .. In addition, when applying the adhesive to the lid, the sealing engagement portion of the molded lid,
The method of applying a linear adhesive using a nozzle
Although generally applied, it is not limited to this method.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings showing the embodiments thereof. First, FIG. 1 shows a part of a plastic container 10 composed of a bowl-shaped main body 11 and a lid 12 that closes the opening thereof. The main body 11 and the lid 12 are A sealing engagement is possible via a known suitable morphological closure means 13. In this embodiment, the main body 11 and the lid 12
Are molded from polypropylene resin and polyester resin, respectively.

In this embodiment, the morphological closing means 1
As 3, the peripheral portion of the opening portion of the main body 11, cross-section has a convex portion 11 ₁ of the rectangular annular is formed, also the lid 12, the periphery of its inner surface, the convex portion 11 ₁ Corresponding to the circular concave section 12 ₁ having a rectangular cross section, these concave and convex portions 11 ₁ and 12 ₁ engage with each other when the main body 11 is hermetically closed by the lid 12. It is supposed to do. Further, in this state, the flat top surface 11 ₂ of the convex portion 11 _{1 and} the flat bottom surface 12 ₂ of the concave portion 12 ₁ are shaped and dimensioned so as to contact each other.

By the way, in the present invention, in addition to such a morphological closing means 13, as shown in FIG. 1, on the surface of the bottom surface 12 ₂ of the recess 12 ₁ formed on the inner surface of the lid 12, A pressure-sensitive adhesive layer 15 is formed by applying a pressure-sensitive adhesive made of an acrylic resin (for example, “Vinylol PSA AV-6,100” (trade name) manufactured by Showa Polymer Co., Ltd.) and drying it. is there. By doing so, the main body 11 and the lid 12 are adhered to the main body 11 by the adhesive layer 15 present in the hermetically engaging portion, in addition to the hermetically closed closure by the morphological closure means 13. Therefore, the inside of the main body 11 can be kept airtight with respect to the outside.

Next, in FIG. 2, as another embodiment of the present invention, the outer peripheral surface of the main body 21 molded from the polypropylene resin as shown in FIG.
The container 20 formed by surrounding by is shown. Also in this embodiment, the opening of the main body 21 can be closed by the lid 22 molded from polystyrene resin via the morphological closing means 23, as in the case of the embodiment shown in FIG. However, the closing means 23 is shown in FIG.
It is substantially the same as the case. However, in this example, as the pressure-sensitive adhesive layer 25, an isobutylene-styrene copolymer hot melt pressure-sensitive adhesive is used,
Although different, in the present embodiment as well, the presence of the pressure-sensitive adhesive layer 25 can similarly provide airtightness between the main body 21 and the lid 22.

Finally, FIG. 3 shows yet another embodiment of the invention. The container 30 according to this embodiment has a main body 31 and a lid 32 which are different in shape from those of the previously described embodiment, but both are different due to other forms of morphological closure means 33. , The same point that they can be hermetically engaged with each other, and the main body 31 and the lid 32 are
However, the same applies to molding from polypropylene resin and polystyrene resin, respectively. However, the present embodiment is different in that natural rubber dissolved in toluene is applied as the adhesive layer 35 applied to the lid 32. The toluene contained in the pressure-sensitive adhesive layer 35 volatilizes within a short time after application of the pressure-sensitive adhesive layer 35, so that toluene does not remain in the pressure-sensitive adhesive layer 35. Also in this embodiment, the morphological closing means 3 is used.
It is obvious that the presence of the pressure-sensitive adhesive layer 35 additionally provided to the container 3 maintains the airtightness with respect to the outside in the hermetically closed state of the container 30.

The present invention is carried out by the various embodiments as exemplified above. Next, the results of a comparative test conducted for confirming the effectiveness of the present invention will be described. To do. First, as a comparison container, in the containers 10, 20 and 30 according to the examples shown in FIGS. 1, 2 and 3,
Those without the adhesive layers 15, 25 and 35 were molded respectively. Next, the containers 10, 20 and 30 according to the examples shown in FIGS. Drinking water was put into each of the main bodies of the comparative container and the container according to the present invention which were molded in this way, and after covering each with a lid, the container was laid down sideways and left for 2 hours. As a result, in each comparative example, the drinking water exuded from the container, but in the containers according to the respective examples of the present invention, such phenomenon of exudation of drinking water was not observed. Further, no adhesive transfer from the adhesive layer applied to the lid to the main body was observed.

Further, the container according to the present invention was left at room temperature for one month, and then the lids were removed, respectively.
It was also confirmed that the same lid could be used to close and close again. Further, a large force was applied from the outside to the container resealed in this way, but no exudation of drinking water was observed. As described above, it is clearly confirmed from the results of this comparative test that the present invention exerts the intended action and effect.

In the above embodiment, the material of the main body and the lid is the specific plastic material, and the material of the adhesive is the specific material. It is obvious that other suitable materials can be selected as long as they satisfy the above requirements. It is generally optimal to apply the pressure-sensitive adhesive to the sealing engagement portion of the lid in a linear shape by using, for example, a nozzle, but of course, it is limited to such means. Not a thing.

[0018]

As described above, the present invention provides a hermetically-sealed disposable container having airtightness and also reusability, particularly a plastic container. The present invention provides an optimum container suitable for use in the restaurant industry, the food industry, and the like.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a similar view showing a second embodiment.

FIG. 3 is a view similar to FIG. 1 showing a third embodiment.

[Explanation of symbols]

 10, 20, 30 Container 11, 21, 31 Main body 12, 22, 32 Lid 13, 23, 33 Morphological closing means 15, 25, 35 Adhesive layer

Claims (6)

[Claims] 1. A sealed disposable container comprising a main body having an opening and a lid closing the opening, wherein the main body and the lid are formed corresponding to the opening and the lid of the main body. In addition to the fact that it is possible to hermetically close by means of a conventional closing means, an adhesive layer is interposed in the hermetically closed part, and the hermetically closed part is made airtight by this adhesive layer. An airtight disposable container characterized by: 2. The airtight disposable container according to claim 1, wherein the pressure-sensitive adhesive layer is provided in a hermetically closed portion of the lid. 3. The airtight disposable container according to claim 2, wherein the adhesive is acrylic resin, rubber (natural or synthetic), or the like. 4. The airtight disposable container according to claim 1, wherein the main body and the lid are made of plastic. 5. The airtight disposable container according to claim 3, wherein the material of the lid is a plastic material that strongly adheres to the adhesive, and the material of the main body is a plastic material that adheres weakly to the adhesive. 6. The airtight disposable container according to claim 4, wherein the material of the main body is polypropylene resin, and the material of the lid is polystyrene resin or polyester resin.