JP2011251749A - Container with over-cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reinforce a flange part of a container body.SOLUTION: A container with an over-cap includes an over-cap 6 and a container 4 having a flange part 4c in an opening part. In the over-cap 6, an annular fitting part 6b is provided on an outer circumference of a cap body 6a, a bent wall 6c to be bent outwardly in the radial direction of the cap body 6a is continuously provided on a lower end of the annular fitting part 6b, and an annular shock-absorbing wall to cover the annular fitting part 6b so that a space is interposed from its outer circumference is continuously provided on the bent wall 6c. The annular fitting part 6b is fitted to the flange part 4c. Any shock on the flange part 4c of the container body 4 is mitigated by the bent wall 6c and the annular shock-absorbing wall 6d to prevent the flange part 4c from being cracked.

Description

  The present invention relates to a container covered with an overcap.

  Conventionally, a lightweight and thin cup-shaped plastic container has been used as a container for storing beverages or the like (for example, see Patent Document 1).

  As illustrated in FIG. 7, this cup-shaped plastic container has a flange portion 1 around the opening, and after the container is filled with contents a such as beverage, the seal lid 2 is flanged. It is sealed by being sealed to part 1. Further, an overcap 3 is put on the seal lid 2 so that the seal lid 2 is not peeled off, or is protected so that dust or the like does not adhere to the seal lid 2 and its periphery (see, for example, Patent Document 2). .

JP 2006-315726 A JP 2003-285853 A

  Since the conventional overcap has a configuration in which the annular fitting portion 3b is simply provided on the outer periphery of the cap body 3a, the seal lid 2 of the plastic container is not peeled off as described above, or the seal lid 2 and its It can only perform the function of protecting the surroundings from dust and the like.

  However, the package body filled with the content a in the plastic container and sealed with the sealing lid 2 collides with the adjacent package body during transportation or display, or falls on the floor to cause the flange portion 1. May be deformed, cracked, or chipped. If the flange portion 1 is deformed, cracked, or the like, peeling or the like occurs between the flange portion 1 and the seal lid 2 to impair the sealing performance of the package, thereby impairing the commercial value.

  In recent years, plastic containers reduced in weight have been used to save resources, and the flange portion 1 has been made thinner accordingly. Since the strength of the flange portion 1 decreases as the thickness decreases, there is a problem in that deformation, cracks, and defects are likely to occur.

  In particular, when an in-mold label container in which the container and the skin member are integrated by setting the skin member such as a label in the mold and performing injection molding processing, the skin member 7 and the injection resin are formed on the flange portion 1. The boundary 8 is exposed on the surface of the flange portion 1, and the boundary 8 functions like a notch. Therefore, when an external force such as an impact force is applied to the flange portion 1, the flange portion 1 is likely to be cracked or damaged with the boundary 8 as a base point. There is a problem that cracks and defects are likely to occur.

  Therefore, an object of this invention is to provide the container with an overcap which can eliminate the said problem.

  The present invention is for solving the above-described problems, and employs the following configuration.

  In addition, although the referential mark of drawing is attached | subjected with a parenthesis, this invention is not limited to this.

  That is, the invention according to claim 1 is a container with an overcap comprising an overcap (6) and a container (4) having a flange portion (4c) at an opening, wherein the overcap (6) is a cap body (6a ) Is provided with an annular fitting portion (6b), and a bent wall (6c) bent outward in the radial direction of the cap body (6a) is continuously provided at the lower end of the annular fitting portion (6b). An overcap (6) in which an annular buffer wall (6d) that covers the annular fitting portion (6b) from the outer periphery of the bent wall (6c) so as to interpose a gap (11) is provided, and the flange A container with an overcap in which the annular fitting portion (6b) is fitted to the portion (4c) is employed.

  As described in claim 2, in the container with an overcap according to claim 1, the thickness of the flange portion (4c) can be set to 0.5 mm or more and 1.0 mm or less.

  As described in claim 3, in the container with an overcap according to claim 1 or 2, an integrated container and skin member can be adopted as the container (4).

  As described in claim 4, in the container with an overcap according to any one of claims 1 to 3, the annular buffer wall (6d) is located above the annular fitting portion (6b). It can also be extended.

  As described in claim 5, in the container with an overcap according to any one of claims 1 to 3, the curled portion (10) bent to the inner peripheral side of the annular buffer wall (6d). It is also possible that the curled portion (10) faces the annular fitting portion (6b).

  According to the container with an overcap according to the present invention, it is possible to protect the container so that the sealing lid of the container is not peeled off, or to prevent dust and the like from adhering to the sealing lid and its periphery. Even when a package packed and sealed with a seal lid is transported, displayed, etc., even if an external force such as impact force is applied from the side of the flange due to collision, dropping, etc., the elastic force of the bent portion of the bent wall and the annular shape Since the impact force can be absorbed by the rigidity of the buffer wall and the buffer effect can be exerted, the occurrence of deformation, cracks, defects, etc. to the flange portion is prevented.

  In particular, a container with an overcap consisting of an in-mold label container with a thin flange part has a significant cushioning effect compared to conventional overcaps, preventing deformation, cracks and defects to the flange part. Is done.

  Therefore, despite the action of external force, the container can be properly sealed and the commercial value can be maintained for a long time.

  Further, the presence of the annular buffer wall provides an advantage that the touch when the container is held is improved, the finger can be easily put on the overcap when the container is opened, and the overcap is easily removed from the container body.

It is a perspective view of a container with an overcap concerning the present invention. It is a disassembled perspective view of a container with an overcap. It is a vertical sectional view of a 1st embodiment of a container with an overcap. It is an enlarged view of the principal part in FIG. It is an enlarged view of the principal part of the vertical sectional view of a 2nd embodiment of a container with an overcap. It is an enlarged view of the principal part of the vertical sectional view of a 3rd embodiment of a container with an overcap. It is a figure similar to FIG. 4 of the container with a conventional overcap.

  The form for implementing this invention is demonstrated below.

<Embodiment 1>
As shown in FIGS. 1 to 3, the container with an overcap includes a container 4, a seal lid 5, and an overcap 6.

  The container 4 is specifically a cup-shaped container. As shown in FIG. 3, the container 4 has an inverted truncated cone-shaped body portion 4b whose bottom is closed by a bottom portion 4a, and a flange portion 4c around an opening at the upper end thereof. Is provided.

  The flanged container 4 is formed by in-mold molding, and a skin member 7 such as a label is attached to the surface of the trunk 4b simultaneously with the entire molding of the container 4. Specifically, a pre-molded label-shaped skin member 7 is attached to the inner surface of a body forming cavity in a cavity of a mold (not shown) by suction or the like, and the molten resin is injected from the bottom forming cavity side, Flow from the formation cavity to the flange formation cavity. The injection resin spreads over the entire cavity to form the container 4 and simultaneously takes the skin member 7 into the thickness of the body 4b. Thereafter, by opening the mold, the flanged container 4 whose surface of the body 4b is decorated with the skin member 7 is discharged out of the mold.

  When molding the flanged container 4, the skin member 7 is placed on the flange forming cavity side so that the injection resin does not flow between the skin member 7 and the mold when flowing from the body forming cavity to the flange forming cavity. It is stuck in the cavity so that it can enter. Therefore, as shown in FIG. 4, the boundary 8 between the edge of the skin member 7 and the injection resin appears linearly on the surface of the flange portion 4 c of the molded container 4. As described above, the boundary 8 plays a role like a notch. Therefore, when an external force such as an impact force acts on the flange portion 4c where the boundary 8 exists, the flange portion 4c is likely to be deformed, cracked, broken, or the like. However, when an external force such as an impact force is applied to the flange portion 4c from the side surface by the overcap 6 which will be described later, the occurrence of cracks, defects or the like with the boundary 8 as a base point is prevented.

  In addition, as said injection resin, resin which consists of polyethylene and a polypropylene, for example can be used. Polypropylene is more preferably used because it can maintain strength even when it is thinned and has excellent heat resistance.

  As the skin member 7, a composite film comprising at least a base material layer / sealant layer can be used. For example, a biaxially oriented polypropylene resin layer (sealant layer) / gas barrier layer / PET (polyethylene terephthalate) layer / biaxial A laminate of stretched polypropylene resin layers punched into a label can be used. Although not shown, on the skin member 7, a pattern for decorating the surface of the body 4 b of the container 4, characters for displaying predetermined items, and the like are displayed by printing or the like.

  The seal lid 5 is formed as a sheet body having a size and a shape that covers the opening of the flanged container 4. An adhesive layer (not shown) such as a polypropylene resin layer is formed on the inner surface of the seal lid 5. The seal lid 5 is put on the opening of the container 4 and the periphery thereof is heated and pressed to the flange portion 4c of the container 4, whereby the seal lid 5 is bonded to the flange portion 4c via the adhesive layer. When the seal lid 5 is bonded to the flange portion 4c, the container 4 is filled with a content a such as a beverage, and the container 4 is sealed by sticking the seal lid 5 to the flange portion 4c. The contents a are protected.

  As shown in FIGS. 1 to 4, the overcap 6 has an annular fitting portion 6b on the outer periphery of the cap body 6a.

  The cap body 6a has a size and shape that covers the seal lid 5, and includes a bulging portion at the center. In the bulging portion, a straw, a spoon or the like (not shown) is accommodated as necessary.

  The annular fitting portion 6b is an annular groove and is formed so that the outer peripheral edge of the flange portion 4c of the container 4 can be introduced. Due to the fitting between the annular fitting portion 6b and the outer peripheral edge of the flange portion 4c of the container 4, the overcap 6 is prevented from being unexpectedly detached from the container 4 except when the lid is opened.

  As shown in FIG. 1 to FIG. 4, the convex portions 9 are desirably formed continuously or intermittently at a predetermined angular pitch at a location opposite to the location where the annular groove contacts the cap body 6 a. . When the convex portion 9 is provided intermittently, the overcap 6 can be easily removed when the package is opened. The overcap 6 can be easily removed by forming the convex portion 9 as a continuous ring and making the annular groove shallow.

  A bent wall 6c that bends outward in the radial direction of the cap body 6a is connected to the lower end of the annular fitting portion 6b of the overcap 6, and the annular fitting portion 6b is connected to the bent wall 6c. An annular buffer wall 6d that covers the outer periphery so that the gap 11 is interposed is provided continuously.

  In the first embodiment, the annular buffer wall 6d is formed in a direction perpendicular to the flange 4c, but may be formed so as to be inclined inward or outward. In the case where it is formed so as to be inclined outward, the distance between the annular buffer wall 6d and the annular fitting portion 6b can be increased, so that the buffer effect can be further enhanced.

  Further, in Embodiment 1, the annular buffer wall 6d is formed in a straight line shape, but is not limited to this, and may be in a curved line shape or a bent line shape.

  The bent wall 6c is provided to connect the annular buffer wall 6d to the annular fitting portion 6b. The bent wall 6c can be formed in a desired shape such as an annular U-shaped groove or V-shaped groove, but a U-shaped groove is preferable in order to exhibit a buffering effect using elastic force.

  The annular buffer wall 6d can extend upward to the same height as the annular fitting portion 6b, but is formed to extend upward from the annular fitting portion 6b in order to enhance the buffering effect. Is desirable.

  The overcap 6 can be obtained, for example, by vacuum-pressure forming a sheet of PET or the like. The thickness of the overcap 6 is preferably 100 to 700 μm. When the thickness is less than 100 μm, the elastic force and rigidity for expressing the buffer effect are insufficient. Further, if the thickness is greater than 700 μm, molding becomes difficult.

  Next, an experimental example in which the product of the present invention is compared with the conventional product will be described.

  Polypropylene with a melt flow rate of 100 g / 10 min (grade name PMD81M) is used as the injection resin, and the biaxially oriented polypropylene resin layer (30 μm) / deposited polyethylene terephthalate layer (12 μm) / biaxially oriented polypropylene is used as the label. A large number of in-mold label containers 4 shown in FIG. 3 were molded by an in-mold molding method using a resin layer (30 μm). They all had a diameter of 71 mm, a height of 110 mm, and a capacity of 250 cc. Moreover, about the thickness of the flange part 4c, two types, a 1.0 mm thing and a 0.5 mm thing, were prepared.

  Further, using a polyethylene terephthalate sheet having a thickness of 200 μm, a large number of overcaps 6 of the present invention shown in FIG. 4 and a conventional overcap 3 shown in FIG. 7 were molded.

  All flanged containers 4 with in-mold molding were each filled with 200 cc of water and sealed with a seal lid 5. These are divided into three groups for lighter weight type 1 (flange portion 4c with a thickness of 1.0 mm) and lighter weight type 2 (thickness with a thickness of 0.5 mm). The second group was covered with the conventional overcap 3 shown in FIG. 7, and the third group was covered with the overcap 6 of the present invention.

  As described above, since the molten resin is injected from the bottom forming cavity side, it reaches the flange portion 4c last. Therefore, when reducing the weight of the in-mold label container 4, there is a limit to increasing the thickness of the flange portion 4c. Molding is possible when the thickness of the flange portion is 0.3 to 0.5 mm, but the strength of the flange portion 4c is insufficient, so that a sufficient sealing pressure cannot be applied when the seal lid 5 is sealed. Therefore, the seal becomes unstable, and the seal lid 5 cannot be sealed to the flange portion 4c without a gap. Moreover, although the thickness of the flange part 4c of the conventional in-mold label container 4 is thicker than 1.0 mm, when the thickness of the flange part 4c is thicker than 1.0 mm, the flange part 4c is not deformed, cracked or damaged even without an overcap. Since it becomes difficult to generate | occur | produce, the buffer effect of the overcap 6 of this invention becomes thin.

  As a drop test, each container 4 was turned sideways, the joint of the skin member 7 as a label shown in FIG. The drop height starts from 10 cm, and the drop height is increased by 10 cm until a crack such as a crack or a defect occurs at the boundary 8 between the edge of the skin member 7 and the injection resin in the flange portion 4 c of the container 4. The height at which the crack occurred was recorded. Then, the average of the drop heights of 24 broken pieces for each group was determined.

  The results of this drop test are shown in Table 1.

  According to Table 1, when the thickness of the flange portion 4c of the container 4 is 1.0 mm, the drop height when there is no overcap is 75 cm, and when the conventional overcap 3 is attached, the drop is dropped. Although the height is only 79 cm which is 4 cm higher, it can be seen that when the overcap 6 shown in FIG. 4 of the present invention is mounted, the fall height is 91 cm which is 16 cm higher than that of the conventional product. Further, when the thickness of the flange portion 4c of the container 4 is 0.5 mm, the drop height when there is no overcap is 45 cm, and when the conventional overcap 3 is attached, the drop height is 7 cm. Although the height is only 52 cm, it can be seen that when the overcap 6 shown in FIG. 4 of the product of the present invention is attached, the fall height is 70 cm which is 25 cm higher than that of the conventional product. That is, it can be seen that when the overcap 6 according to the present invention is attached to the in-mold molded container 4 with a flange portion, the drop strength is remarkably improved.

  Further, according to Table 1, the rate of increase of the drop height when the overcap 6 of the present invention is attached to the drop height of the conventional overcap 3 is approximately when the flange portion 4c has a thickness of 1.0 mm. While it is 1.15 times, it is about 1.34 times when the thickness of the flange portion 4c is 0.5 mm. That is, it can be seen that the overcap 6 of the present invention has a higher buffering effect than the container 4 having a thin flange portion 4c.

  Therefore, according to the overcap 6 of the present invention, even if the container 4 is formed to be thin, it can maintain resistance to external forces such as vibration and impact force so as not to impair the sealing performance. Can be used to save resources.

<Embodiment 2>
As shown in FIG. 5, in the second embodiment, the annular buffer wall 6d of the overcap 6 is formed to extend upward from the annular fitting portion 6b. By forming in this way, it is possible to exhibit a buffering effect against an external force such as an impact force from a wide range of side surfaces including obliquely upward, and further enhance the buffering effect.

  In the second embodiment, the annular buffer wall 6d is formed in a direction orthogonal to the flange portion 4c, but may be formed so as to be inclined inward or outward. In the case where it is formed so as to be inclined outward, the distance between the annular buffer wall 6d and the annular fitting portion 6b can be increased, so that the buffer effect can be further enhanced.

  In the second embodiment, the annular buffer wall 6d is formed in a linear shape, but is not limited to this, and may be a curved shape or a bent shape.

  In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

<Embodiment 3>
As shown in FIG. 6, in the third embodiment, a curled portion 10 that is bent toward the inner peripheral side is formed on the annular buffer wall 6d of the overcap 6, and this curled portion 10 faces the annular fitting portion 6b. I'm hurt.

  Further, the curled portion 10 is formed so as to be in contact with or not in contact with the annular fitting wall 6b or slightly away from the annular fitting wall 6b.

  When the curled portion 10 is interposed between the annular fitting portion 6b and the annular buffer wall 6d, an external force such as an impact force acts on the flange portion 4c of the container 4 which is an in-mold molded product from the side surface of the flange portion 4c. Even so, since the curled portion 10 is deformed in a flat shape so as to allow the external force to escape to the tip of the curled portion 10, an impact force or the like is easily absorbed, and deformation, cracking, chipping, or the like hardly occurs in the flange portion 4c.

  That is, in the first and second embodiments, the buffering effect is expressed by the elastic force of the bent portion of the bent wall 6c and the rigidity of the annular buffer wall 6d. In the third embodiment, the elasticity of the bent portion of the bent wall 6c is obtained. Since the buffer effect is expressed by the force and the elastic force and rigidity of the rigid curled portion 10 of the annular buffer wall 6d, the buffer effect can be further enhanced.

  In the third embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In addition, this invention is not limited to the said embodiment, For example, in the said embodiment, although the container was demonstrated as a cup-shaped thing, this invention is applicable also to containers of shapes other than a cup. Further, the skin member is not limited to the shape shown in the embodiment.

4c ... Flange part 5 ... Seal lid 6 ... Overcap 6a ... Cap body 6b ... Ring fitting part 6c ... Bending wall 6d ... Ring buffer wall 7 ... Skin member 8 ... Boundary 10 ... Curl part 11 ... Gap a ... Contents

Claims (5)

  In a container with an overcap consisting of an overcap and a container having a flange at the opening, the overcap is provided with an annular fitting portion on the outer periphery of the cap body, and the radius of the cap body at the lower end of the annular fitting portion An overcap is provided with a bent wall that is bent outward in the direction, and an annular buffer wall is provided on the bent wall so as to cover the annular fitting portion with a gap from the outer periphery thereof. A container with an overcap, wherein the annular fitting portion is fitted.   The container with an overcap according to claim 1, wherein the flange portion has a thickness of 0.5 mm to 1.0 mm.   The container with an overcap according to claim 1 or 2, wherein the container is an in-mold label container in which the container and the skin member are integrated.   The container with an overcap according to any one of claims 1 to 3, wherein the annular buffer wall extends upward from the annular fitting portion.   4. A container with an overcap according to claim 1, wherein a curled portion that is bent toward the inner peripheral side is formed on the annular buffer wall, and the curled portion faces the annular fitting portion. A container with an overcap, characterized by

Images