JP2006321499A - Sealing device of packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing device of a packaging container which is attached to a container mouth part by a method similar to that of a regular lid without using any special device, and capable of obtaining the sealing function for preventing falsification. <P>SOLUTION: In a synthetic resin-made container in which a lid 4 is fitted to a container body 1 with its peripheral edge of an opening part being formed downwardly, the lid 4 has a peripheral wall 5 leading below a lower edge 6 of the peripheral edge of the opening part of the container body 1, a plurality of locking pieces 7 to be locked to the lower edge 6 of the peripheral edge of the opening part of the container body 1 are formed on the peripheral wall 5 of the lid 4, a cut-guide part 10 is formed toward an upper portion of the peripheral wall with a lower edge of the peripheral wall 5 of the lid being a starting point, and a sealing device is constituted thereby. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sealing device for packaging containers.

Containers that store ice cream, ice confectionery, side dishes, etc. are sold at stores, with the exception of some exceptions, most of them only have an overcap on the container body and have a sealing function to prevent tampering. No inner seal or cap is used.
In addition, for prepared food containers and the like, there are many cases where a cap is placed at the point of time when the food is placed in the container at the store, and a container with a complicated sealed structure cannot be adopted.
JP 2003-285853 A

In the invention disclosed in the above-mentioned patent document, an upward locking cut portion is formed on the inner wall of the lid so as to be engaged with the lower surface of the flange of the container opening, thereby preventing the lid from coming off. In the present invention, even if a function for preventing the lid from being removed is obtained, a sealing function for the purpose of preventing tampering cannot be obtained.
JP 2003-335352 A

  In the invention disclosed in the above patent document, a locking wall is formed by post-processing at the lower part of the skirt wall of the lid to form a sealing structure, and a processing device is required for the post-processing.

  Therefore, as a solution to such a problem, the applicant first is a lid made of a synthetic resin fitted into the container body formed with a convex portion having a downward inclined surface on the outer side of the mouth edge, The lid forms a locking wall that extends along the convex portion of the container body and extends downward, and a plurality of vertical cuts are formed in the locking wall of the lid, and a side portion of the locking wall of the lid Proposed a sealing device having an annular fracture portion (Japanese Patent Application No. 2004-308061).

  Similarly to the above-mentioned applicant's invention, this invention is a packaging that can be attached to the container mouth by a method similar to a normal lid without using a special device, and can provide a sealing function for the purpose of preventing falsification. An object of the present invention is to obtain a container sealing device.

According to the present invention, in a synthetic resin container in which a lid is fitted to a container main body having an opening peripheral edge formed downward, the lid extends below the lower edge of the peripheral edge of the opening of the container main body. It has a peripheral wall, and a plurality of locking pieces are formed on the peripheral wall of the lid body to be engaged with the lower edge of the peripheral edge of the opening of the container body, and the lower edge of the lid peripheral wall is a starting point toward the upper part of the peripheral wall A sealing guide is formed by forming a cutting guide.
The above-mentioned “periphery of the opening portion is formed downward” means a shape in which the locking piece of the lid can be locked. Specifically, as shown in the drawing, in addition to the shape in which the lower edge is cut downward, the locking piece of the lid is engaged even when the peripheral edge of the opening is curled or wound. As long as it can be stopped, it is included in “the periphery of the opening is formed downward” in the present invention.
Also, the “lower edge of the peripheral edge” refers to the edge that is cut off when the lower edge is cut downward, and below the curled edge when curled or tightened. The dead center.
Sealing is performed by the engagement between the locking piece and the lower edge of the peripheral portion, and the sealing is released by breaking the peripheral wall of the lid body along the cutting guide portion. It is preferable that a knob is continuously provided below the peripheral wall of the lid, and the cutting guide is broken by pulling the knob.
According to a second aspect of the present invention, the locking piece is formed by cutting the peripheral wall of the lid and retaining the cut portion obliquely upward inward.

The reason why the peripheral portion of the container body is formed downward is to lock the locking portion of the lid on the lower edge of the peripheral portion. Therefore, the specific cross-sectional shape of the peripheral portion may be a linear inclined surface or a vertical surface in addition to an arc shape as shown in the following embodiments.
The locking piece of the lid body may have any shape that can be locked to the lower edge of the peripheral edge of the container body. More specifically, a trapezoidal shape, an inverted U-shape, and the like are conceivable in addition to the square shape shown in the embodiments.
Note that the locking piece does not necessarily have to be positioned in the vicinity of the lower edge of the peripheral edge of the container body opening when the lid is deeply fitted into the container body. Even if the locking piece is positioned below the lower edge of the peripheral edge, the locking piece must be locked to the lower edge of the peripheral edge to remove the cover when opening the cover. Can achieve the sealing purpose.
The breaking guide portion is for easily breaking the peripheral wall of the lid, and specifically, a perforation or a groove can be considered. And it is good to connect a knob piece in the lower edge of the peripheral wall of a cover body, and to provide a cutting guide part on both sides of a knob piece. The position where the break guide portion and the knob piece are installed is not limited to the position of the embodiment as long as the force for pulling the knob piece is transmitted to the break guide portion and the break guide portion can be broken. Further, the length of the break guide portion is determined in consideration of the material and the like.

In this invention, when covering the lid, the lid is applied to the opening of the container body in the usual manner, and is pushed downward. At this time, since the locking piece is pushed by the upper surface of the peripheral edge of the container body and elastically deforms outward, the lid can be fitted to the container body. When the lid is fitted to the container main body, the locking piece of the lid returns to its original shape due to elasticity, and is in an open state facing the lower edge of the peripheral edge of the container main body.
In this state, when the lid is pulled up to remove the lid as it is, the locking piece is locked to the lower edge of the peripheral edge of the container body, and the lid cannot be removed.
On the other hand, when the peripheral wall of the lid is broken along the breaking guide portion, the locking can be easily released, so that the lid can be removed.
Thus, in this sealing device, since the method of covering the lid is exactly the same as a normal lid without a sealing function, even when the product is packed in the container at the store and the lid is closed, it is handled in the same manner as a conventional container. be able to.

In the figure, a flange 2 having a convex arcuate cross section is formed on the periphery of the opening of the container body 1, and an end 3 of the flange 2 is directed downward.
On the other hand, the lid body 4 has a peripheral wall 5 having a depth extending below the lower edge 6 of the flange 2 of the container body, and the peripheral wall 5 has a position corresponding to the lower side of the lower edge 6 of the flange 2. A plurality of locking pieces 7 projecting inward and obliquely upward are formed at equal intervals. The locking piece 7 is shaped by punching the peripheral wall 5 of the lid body 4 in a front shape, and holding the punched portion simultaneously with the punching operation by means such as press molding or heating inward of the lid body 4. It is formed.

A knob 8 is connected to the lower edge 9 of the peripheral wall 5 of the lid 4. Although the figure shows an inverted trapezoidal shape, it can be of any shape and size as long as it can be picked. It is sufficient to provide this knob piece at one place, but a plurality of knobs may be provided.
A perforation 10 is formed upward from the intersection of the left and right edges of the knob 8 and the lower edge 9 of the peripheral wall 5 of the lid 4.

  In the said embodiment, when fitting the cover body 4 to the container main body 1, the cover body 4 is applied to the opening part of the container main body 1, and it pushes in in the normal way. At this time, since the inward locking piece 7 is pushed by the flange 2 of the container body 1 and elastically deforms toward the lid body, the lid body 4 can be fitted into the container body 1. When the locking piece 7 passes the lower edge 3 of the flange 2, the locking piece 7 returns to its original shape due to elasticity and protrudes inward.

If the cover 4 is pulled upward in this state, the locking piece 7 is locked to the lower edge 6 of the flange of the container body 1, so the cover 4 cannot be pulled up and the container does not open. .
On the other hand, when the knob piece 9 is lifted obliquely upward, the peripheral wall 5 of the lid 4 is broken along the perforation 10, so that the engagement between the locking piece 7 and the flange lower edge 6 of the container body 1 is released. The lid can be removed and the container can be opened.

FIG. 3 shows an example of a method for forming the locking piece 7. The forming tool 11 includes a blade portion 12 and a pushing portion 13. The blade portion 12 protrudes from the push-in portion 13, and the push-in portion 13 is heated.
When the forming tool 11 configured in this way is pressed against the peripheral wall 5 of the lid body 4, the peripheral wall is cut into a predetermined shape (for example, a frontal shape) by the blade part 12, and then the part cut by the pushing part 13 Is pushed inward and retained in shape by heating, and the locking piece 7 is obtained.

  The formation of the locking piece is usually performed before the lid 4 is mounted on the container body 1, but is performed after the contents are stored in the container body 1 and the lid 4 is mounted on the container body 1. You can also.

  The present invention can cover the lid according to a normal procedure, and can provide a reliable sealing function without requiring fine molding conditions, and has industrial applicability. .

Sectional drawing of the principal part of this invention embodiment Similarly, a partially enlarged front view with part of the lid omitted Sectional drawing which shows the manufacturing method of the latching piece of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container body 2 Flange 3 End part of flange 4 Lid body 5 Perimeter wall of lid 6 Lower edge of flange 7 Locking piece 8 Picking piece 9 Lower edge of lid body peripheral wall 10 Perforation

Claims (2)

A synthetic resin lid that is fitted to the container body with the peripheral edge of the opening formed downward,
The lid body has a peripheral wall that extends below the lower edge of the peripheral edge of the opening of the container body,
A plurality of inner diagonally upward locking pieces that are locked to the lower edge of the peripheral edge of the container body are formed on the peripheral wall,
A cutting guide portion is formed on the peripheral wall of the lid from its lower edge toward the upper portion of the peripheral wall,
A sealing device for a packaging container which is sealed by engagement between the locking piece and the lower edge of the peripheral edge, and is released by breaking the peripheral wall of the lid body along the cutting guide. The packaging container sealing device according to claim 1, wherein the locking piece is formed by cutting the peripheral wall of the lid and retaining the cut portion inwardly.

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