JP7358751B2 - paper cup sealing member - Google Patents

Description

The present invention relates to a member that is attached to a paper cup to seal it so that the contents do not leak.

Conventionally, the periphery of the bottom member is folded back to provide a periphery bent portion, the bottom member is inserted inside the lower end of a cylindrical body member, and the body member is bent to cover the periphery bent portion of the bottom member. There is a paper cup in which the upper end of the body member is curled outward and a top curl part is provided, and this paper cup is sold in stores as a cup for cold drinks such as juice and carbonated drinks, and hot drinks such as coffee and cocoa. , widely used for sale at cup vendors. Furthermore, paper cups are also manufactured for making confectionery such as popcorn, in which polyethylene resin or a barrier layer is provided on the inside of the paper cup, and a lid is fused to the opening of the paper cup.

Among these paper cups, paper cups with high barrier properties that can be stored for a long period of time, and high-performance paper cups that do not impair the flavor and taste of the contents, are made with barrier films that have high barrier properties and low elution properties. A paper cup placed inside is effective. However, such paper cups also have problems in their shelf life after being opened, since the lid material is peeled off and once opened, they cannot be resealed. Therefore, various paper cups have been proposed that are provided with lids that can be resealed after being opened.

For example, Patent Document 1 discloses a cup lid in which a flange portion having a screw groove is formed with a tapered portion that becomes wider toward the open side, and the screw groove is formed inside the tapered lid. By placing it over the cup and screwing it in, the cup curl formed at the edge of the opening of the cup deforms slightly along the screw groove and is pressed against the tapered part of the lid to make a tight seal, thereby sealing the cup. .

However, since the cup curl part and the screw groove come into contact with each other with a relative angle corresponding to the inclination angle of the screw groove, it is difficult to achieve uniform contact over the entire cup curl part, and there may be gaps somewhere. This causes a problem in that if the contents of the cup are liquid or fine powder, they may leak out from the gap.

Furthermore, in Patent Document 2, a paper cup having a top curl at the upper end of the opening has an easy-peel lid material fused to the upper end of the top curl, and a rigid inner ring fixed to the top curl at the lower end of the top curl. A paper cup is disclosed in which a removable cap is arranged on the rigid inner ring, which covers the rigid inner ring and the lid, and the rigid inner ring and the cap are pressed against the top curl part from above and below to seal the paper cup. .

However, due to the nature of the material of the paper cup, the dimensional accuracy of each part is not high, and there is a step in the top curl part where the paper material is pasted. It was difficult to seal in a uniform state. Moreover, the paper cup is easily deformed depending on the force applied while the user is holding it. As a result, there are some areas where the degree of pressure is weak or there are gaps, which tends to occur in some areas, especially when the lid is removed or partially opened and the cap is put back on. However, there was a problem that the contents might leak out.

Japanese Patent Application Publication No. 2001-114243 JP2017-77912A

The present invention has been made in view of the problems of the prior art as described above, and it is possible to improve the processing accuracy during manufacturing and the user's handling of the paper cup, which is provided with an outer curled upper end on the edge of the opening at the upper end. It is an object of the present invention to provide a sealing member that can be reliably sealed regardless of the direction.

In order to solve the above problem, the invention according to claim 1 of the present invention is as follows:
It consists of a cap and a main body that can be locked together by sandwiching the curled part of the upper end of the paper cup from above and below.
The main body includes a side wall portion along the outside of the side surface of the paper cup , a plate-shaped step portion extending from the upper end of the side wall portion toward the outer circumferential side on which the upper end curl portion is placed, and an end on the outer circumferential side of the step portion. a main body locking portion for locking with the cap extending downward from the portion;
The lower end of the side wall portion is located below the lower end of the main body locking portion,
The cap has a top surface portion that covers the opening of the paper cup, an inner ring that hangs down from the top surface portion near the inner side of the side surface of the paper cup in the shape of a peripheral wall, and a cap locking portion for locking with the main body. ,
The inner ring is a paper cup sealing member characterized in that the outer circumferential surface is a slope inclined at a larger angle than the side surface of the paper cup.

Moreover, the invention according to claim 2 of the present invention is
The paper cup according to claim 1, wherein the main body has a convex portion extending upward from the outer peripheral end of the stepped portion, and the height of the convex portion is lower than the height of the upper end curl portion. It is a sealing member.

In addition, the invention according to claim 3 of the present invention is
The paper cup sealing member according to claim 1 or 2, wherein the main body locking portion and the cap locking portion have threads, and the main body and the cap are locked by screwing.

According to the invention as set forth in claim 1 of the present invention, when the main body and the cap of the paper cup sealing member of the present invention are attached to the paper cup and locked, the slope of the outer peripheral surface of the inner ring is on the inside of the side surface of the paper cup. The paper cup is pressed to eliminate the gap, and the curled portion of the top end of the paper cup is pressed and deformed by the top surface of the cap and the slope of the outer circumferential surface of the inner ring, and is securely sealed through surface contact with the top surface and slope. In addition, since the side wall part suppresses large deformation of the paper cup as a whole, even if there is some variation in the processing accuracy of the paper cup, or even if the paper cup is slightly deformed due to the force applied when the user holds it, There is no gap between the paper cup and the sealing member, and even if the contents are liquid or fine powder, they will not leak out.

According to the second aspect of the invention, the convex portion provided at the outer circumferential end of the stepped portion presses and deforms the upper end curled portion by the slope of the top surface portion and the outer circumferential surface of the inner ring. In some cases, the upper end curl can be supported from the outer periphery, preventing deformation from escaping to the outer periphery and making surface contact with the top and slope unstable. It is more preferable that the height is lower than the height of the substantially circular upper end curl portion, so that the top surface portion presses and deforms the upper end curl portion to achieve surface contact without getting in the way and can be reliably deformed.

According to the third aspect of the invention, since the outer peripheral surface of the inner ring is a slope inclined at a larger angle than the inner surface of the paper cup, the slope becomes stronger by increasing the screwing amount of the cap. The degree of sealing can be easily strengthened by applying pressure to the inner side and the upper curled portion.

FIG. 1 is a partial vertical sectional view of one form of the paper cup sealing member of the present invention. FIG. 2 is an external view showing how one form of the paper cup sealing member of the present invention is attached to a paper cup. FIG. 2 is a partial vertical cross-sectional view of a paper cup sealed in one form of the paper cup sealing member of the present invention. FIG. 2 is an external view of a state in which one form of the paper cup sealing member of the present invention is attached to a paper cup and sealed.

Embodiments of the present invention will be described in detail below with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

FIG. 1 is a partial vertical sectional view of one form of the paper cup sealing member of the present invention. Moreover, FIG. 2 is an external view showing a mode in which one form of the paper cup sealing member of the present invention is attached to a paper cup. A paper cup 10 having a side surface 11 and a bottom (not shown) made of a laminated sheet based on paper generally has an opening 13 at the upper end of the side surface 11, and the upper end of the side surface 11 curls outward. The upper end curl portion 12 is formed by rounding the upper end. The upper end curl part 12 has a cylindrical shape with a substantially circular cross section and goes around the upper edge of the paper cup 10, giving shape retention to the paper cup 10.

The paper cup sealing member 1 of the present invention consists of a cap 2 and a main body 3. The main body 3 is fitted from the bottom side of the paper cup 10 to the outside along the side surface 11 of the paper cup 10 as shown in FIG. 2, and the cap 2 is put on from the top side to cover the opening 13 of the paper cup.

The main body 3 has a side wall portion 32 that is equally sloped along the side surface 11 of the paper cup, a step portion 33 at the upper end of the side wall portion 32, and a convex portion extending upward from the outer peripheral end of the step portion 33. 34 is standing up. When the main body 3 is attached to the paper cup 10, the side wall portion 32 runs along the outside of the side surface 11, and the upper end curl portion 12, which is curled outward from the side surface 11, is placed on the stepped portion 33. The outer peripheral side of the upper end curl portion 12 is supported by the convex portion 34. The height of the convex portion 34 is lower than the height of the upper end curl portion 12 having a substantially circular cross section, and the upper end curl portion 12 protrudes higher than the upper end of the convex portion 34 .

A main body locking portion 31 for locking with the cap 2 is provided in a portion extending downward from the convex portion 34, and a screw thread 35 is provided here as a locking structure. As the structure for locking, a known structure other than a screw thread can be adopted, and for example, a plug fitting in which a fitting recess and a fitting protrusion are combined may be used.

The material for the main body 3 is not particularly limited, such as plastic, metal, paper, wood, etc., as long as it has the rigidity to be able to be attached to and detached from the paper cup 10 and the cap 2, but plastic resin, which is easy to process from the viewpoint of productivity and cost, etc. A laminate thereof is preferred, and suitable examples include polypropylene resin, polystyrene resin, high impact polystyrene resin, and polyester resin. Further, paper, metal foil, etc. may be laminated.

The cap 2 includes a top surface portion 21 that covers the opening 13 of the paper cup 10, an inner ring 24 that hangs down from the top surface portion 21 in a peripheral wall shape close to the inside of the side surface 11 of the paper cup, and a ring 24 for engaging the main body 3. The inner ring 24 has a cap locking portion 22, and the outer circumferential surface of the inner ring 24 has a slope 25 inclined at a larger angle than the side surface 11 of the paper cup. Further, the cap locking portion 22 is formed with a thread 23 in order to be screwed into the main body locking portion 31 .

The material constituting the cap 2 is not particularly limited, such as plastic, metal, paper, wood, etc., as long as it has the rigidity to be detachable from the main body 3, but plastics that are easy to process from the viewpoint of productivity and cost etc. Resins and laminates thereof are preferred, and suitable examples include polypropylene resin, polystyrene resin, high impact polystyrene resin, and polyester resin. Further, a barrier layer may be laminated as necessary.

When the cap 2 is placed on the paper cup 10, by making the outer diameter of the inner ring 24 at the lower end smaller than the diameter of the opening 13 of the paper cup, the upper end curl portion 12 and the side surface 11 of the paper cup 10 are is inserted into the paper cup 10 without touching the inside of the paper cup 10.

On the other hand, on the upper side of the inner ring 24, that is, on the side connected to the top surface part 21, the slope 25 is inclined at a larger angle than the side surface 11 of the paper cup, so that the shape is wider toward the outer circumference, and a certain portion Its outer diameter becomes larger than the diameter of the opening 13 of the paper cup on the upper side, and as the cap 2 descends, the slope 25 comes into contact with the upper end curl part 12 and the inside of the side surface 11 of the paper cup 10, and moves these in the outer circumferential direction. It becomes like pressure.

The cap 2 and the main body 3 are moved from being separated as shown in FIG. 2 to close to each other so as to sandwich the upper end curl part 12 from above and below, and the upper end curl part 12 is placed on the stepped part 33 as shown in FIG. In this state, the cap 2 is further rotated to screw the locking portions together, thereby sealing the paper cup 10.

FIG. 3 is a partial vertical cross-sectional view of one form of the paper cup sealing member of the present invention in a sealed state. When the threads of the cap 2 and the main body 3 are screwed together, the cap 2 descends in the direction of the black arrow, and as shown by the white arrow in the figure, the top part 21 of the cap 2 comes from above and the inner ring 24 comes from the side. , the upper end curled portion 12 is pushed and deformed, and the upper end curled portion 12 comes into surface contact with the top surface portion 21 and the slope 25 of the inner ring 24. The stepped portion 33 and the convex portion 34 support the upper end curl portion 12 and prevent the pressure exerted by the top surface portion 21 and the inner ring 24 from escaping to the opposite side, thereby ensuring that deformation occurs. Further, at this time, the portions where the upper end curl portion 12 contacts the step portion 33 and the convex portion 34 may also be similarly deformed to form a state of surface contact.

The slope 25 of the inner ring 24 presses the side surface 11 of the paper cup 10 against the side wall portion 32 from the inside, and a sealing effect can also be obtained at that portion. Further, the step formed in the part of the side surface 11 of the paper cup 10 where the paper is pasted can also be made into a sealed state by pressing the upper end curl part 12 to deform it and bringing it into a state of surface contact.

FIG. 4 is an external view of the paper cup 10 in a state where the cap 2 and the main body 3 are screwed together as described above and the paper cup 10 is sealed. The cap 2 and the paper cup 10 are in a surface contact state at the deformed upper end curl portion 12, and furthermore, since this is at two places, the top surface portion 21 and the inner ring 24, a securely sealed state can be achieved. It has become. Therefore, even if the contents of the paper cup are liquid or powder, they will not leak out. Since the side wall portion 32 suppresses large deformation of the entire paper cup, even if the paper cup is slightly deformed due to the force exerted when the user holds the paper cup, the sealing is not impaired.

As explained above, according to the paper cup sealing member of the present invention, the sealing member and the paper cup are reliably closed, and the seal is sealed without leaking even when the contents such as liquid or powder easily leak from even the slightest gap. We can provide parts that can.

1...Paper cup sealing member 10...Paper cup 11...Side surface 12...Top end curl part 2...Cap 21...Top surface part 22...Cap locking part 23...Thread strip 24 ... Inner ring 25 ... Slope 3 ... Main body 31 ... Main body locking part 32 ... Side wall part 33 ... Step surface 34 ... Convex part 35 ... Thread thread

Claims (3)

It consists of a cap and a main body that can be locked together by sandwiching the curled part of the upper end of the paper cup from above and below.
The main body includes a side wall portion along the outside of the side surface of the paper cup , a plate-shaped step portion extending from the upper end of the side wall portion toward the outer circumferential side on which the upper end curl portion is placed, and an end on the outer circumferential side of the step portion. a main body locking portion for locking with the cap extending downward from the portion;
The lower end of the side wall portion is located below the lower end of the main body locking portion,
The cap has a top surface portion that covers the opening of the paper cup, an inner ring that hangs down from the top surface portion near the inner side of the side surface of the paper cup in the shape of a peripheral wall, and a cap locking portion for locking with the main body. ,
The paper cup sealing member is characterized in that the inner ring has an outer circumferential surface that is inclined at a larger angle than a side surface of the paper cup. The paper cup according to claim 1, wherein the main body has a convex portion extending upward from the outer peripheral end of the stepped portion, and the height of the convex portion is lower than the height of the upper end curl portion. Sealing member. The paper cup sealing member according to claim 1 or 2, wherein the main body locking portion and the cap locking portion have threads, and the main body and the cap are locked by screwing.

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