JP2004238070A - Can opening for packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a strong can opening for a packaging container having a high strength and capable of being covered with a cap smoothly without causing the cut face at its tip end to get into contact with content liquid. <P>SOLUTION: This can opening for a packaging container is formed with a recessed catching part which extends toward an inside direction and sinks slightly downward from the end of a moderately arc shaped inclining part, a horizontal stage part which extends horizontally toward the inside direction from the end of the recessed catching part, an outward curl part which stands upward from the end of the horizontal stage part and moderately curls in an arc shape toward an outside direction, and a tip end bent part with the tip end of the outward curl part bent upward toward the inside direction. The tip end bent part of the outward curl part face comes into contact with and catches the recessed catching part. The moderate arc shape on the outside face of the outward curl part is an arc face substantially continuous with the top face of the moderately arc shaped inclining part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a packaging container formed by pressing a pre-plated metal thin plate, which is attached to a can opening attaching portion opened on a top plate of a metal packaging container for storing a liquid such as oil or paint. About the can mouth.
[0002]
[Prior art]
As a prior art, Japanese Patent Application Laid-Open No. 8-281358 (hereinafter, referred to as "conventional example 1") discloses a packaging material having an inner winding curl portion 12 having a tip curled inward as shown in FIG. A container canister is disclosed. Japanese Patent Application Laid-Open No. 7-309341 (hereinafter referred to as "conventional example 2") discloses that, as shown in FIG. 3, the tip of the steep arc-shaped inclined portion 13 is largely bent downward inward to be substantially horizontal. The outer winding opening winding portion 15 (outer winding curl portion) is formed by winding the outer winding opening 14 outward from the winding base 14, and the distal end portion 16 of the outer winding opening winding portion 15 is placed inside. The outer winding opening winding portion 15 is formed so as to be substantially horizontally bent so as to conform to the upper surface of the winding base portion 14, and the upper surface shape of the outer winding opening winding portion 15 is substantially continuous with the upper surface of the steep arc-shaped inclined portion 13. A can opening for a packaging container is disclosed.
[0003]
[Patent Document 1]
JP-A-8-281358 [Patent Document 2]
JP-A-7-309341
[Problems to be solved by the invention]
However, since the opening of the can of the packaging container of Conventional Example 1 has an inner winding curl portion, the content liquid stored in the packaging container penetrates the inner winding curl portion, and the inner winding is not pre-plated. There is a risk of contact with the cut surface of the curled part and causing rust, or a chemical reaction may occur between the cut surface of the curl and the content liquid. Problems also arise.
Since the can opening of the packaging container of Conventional Example 2 is formed with an outer winding opening winding portion (outer winding curl portion), rust is generated due to contact between the cut surface of the curl portion tip and the content liquid, and the content liquid solidifies. Although the problem does not occur, the outer winding curl part is largely bent downward from the steep arc-shaped inclined part to form a horizontal winding base, and is wound from the end of the winding base to form the outer winding curl part. Since the top surface is formed as a steep arc surface that is substantially continuous with the top surface of the steep arc-shaped inclined portion 13, the radius of curvature of the outer curl portion is reduced, the tip of the opening becomes convex, and the The claw portion of the cap with the elastic claw to be fitted is apt to be deformed or broken, and the outer curl portion has a small radius of curvature, so there are few contact points with the resin packing attached to the cap and the sealing performance is poor. There is a risk of liquid leakage, and furthermore, curling Is bent substantially downward from the steep arc-shaped inclined portion to form a horizontal winding base, wound from the end of the winding base, and the winding tip is bent substantially horizontally inward to form the winding base. Is formed so as to match the upper surface of the outer winding, so that the strength of the outer winding curl portion is not sufficient, and there is a problem in that it is easy to generate dust and the like.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a can for a packaging container that solves the above-mentioned problems of the prior art.
[0006]
[Means for Solving the Problems]
The present invention, in order to solve the above problems, in the can mouth of the packaging container, formed at the lower end a can mouth caulking portion for fixing to a can mouth attachment portion opened to the top plate of the packaging container, A cylindrical rising portion that rises almost vertically at the upper portion of the can mouth caulking portion, a neck portion that protrudes in an arc shape inward is continuously formed, and a gentle arc-shaped inclined portion is formed at the upper portion of the neck portion. Forming a concave locking portion extending inward from the end of the circular arc-shaped inclined portion and sinking slightly downward, and forming a horizontal step portion extending horizontally inward from the end of the concave locking portion, Forming an outer curl portion rising upward from the end of the horizontal step portion and curling in a gentle arc outward, forming a tip bent portion in which the tip of the outer curl portion is bent inward upward, and the outer curl portion is formed. The bent part at the tip of the curled part is concave The outer curl portion is formed into a gentle arc surface substantially continuous with the upper surface of the gentle arc-shaped inclined portion so that the stop portion is brought into surface contact with and engaged with the stop portion. It is characterized by the following.
[0007]
[Action]
Since the opening of the can of the packaging container of the present invention is formed by the outer curl portion, the content liquid does not infiltrate into the curl portion, and the content liquid of the tip cut portion of the outer curl portion is not formed. There is no problem of rust due to contact and solidification of the content liquid entering the curled portion.
Forming a concave engaging portion extending inward from the gentle arc-shaped inclined portion of the present invention and slightly sinking downward, and forming a horizontal step portion extending horizontally inward from the concave engaging portion; In order to wind the outer curl part from the end of the part, the shape of the outer surface of the outer curl part is formed into a gentle arc surface, and a gentle arc substantially continuous with the upper surface of the gentle arc-shaped inclined part Surface, and the gently arcuate outer surface makes the fitting of the cap with elastic claws smooth, and prevents the claw of the cap from being deformed or damaged during fitting, and has a gentle arc surface Further, the contact area with the resin packing attached to the cap is increased, the sealing performance is improved, and the liquid leakage can be prevented.
A configuration in which a bent front end bent portion is formed so that a front end of the outer curled portion of the present invention rises upward inward, and the front bent portion of the outer curled portion is brought into surface contact with and engaged with the concave locking portion. Thereby, the strength of the opening of the can mouth is increased, and the occurrence of dust, etc. is prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
FIG. 1A is a longitudinal sectional view showing one embodiment of a can mouth of the packaging container of the present invention. FIG. 1 (b) is a partially enlarged longitudinal sectional view showing one embodiment of a can mouth of the packaging container of the present invention.
The can 1 of the packaging container of the present invention is formed by pressing a thin metal plate made of pre-plated iron or the like. The can opening 1 of the packaging container is fixed to a lower end of a can opening attaching portion (not shown) which is opened on a top plate (not shown) of a metal packaging container for storing a liquid such as oil or paint. A caulking portion 2 for forming the can is formed.
[0009]
A cylindrical rising portion 3 that rises almost vertically from the can-mouth caulking portion 2 is formed. A neck 4 is formed on an upper portion of the cylindrical rising portion 3 so as to protrude in an arc shape inward. The neck 4 has a function as an engaging portion for engaging a claw tip of a cap with an elastic claw (not shown).
[0010]
A gentle arc-shaped inclined portion 5 is formed upward from the neck 4. When the gentle arc-shaped inclined portion 5 is fitted with a cap with elastic claws (not shown), the claws of the cap with elastic claws smoothly slide and move on the upper surface, and the engagement of the claws with the neck 4 is made. It has a function that facilitates matching.
[0011]
A concave engaging portion 6 extending inward from the end of the gentle arc-shaped inclined portion 5 and slightly sinking downward is formed. A horizontal step portion 7 extending substantially horizontally inward from the end of the concave engaging portion 6 is formed. An outer winding curl portion 8 which rises upward from an end of the horizontal step portion 7 and curls outward in a gentle arc is formed. The horizontal step portion 7 extends horizontally inward, rises upward from its end, and is bent outward in an arc to form the outer curl portion 8. Therefore, the outer surface 9 of the outer curl portion 8 has a curvature. It has the function of enabling a gentle arc surface with a large radius.
[0012]
The gentle arc surface of the outer surface 9 of the outer winding curl portion 8 and the gentle arc surface of the gentle arc-shaped inclined portion 5 are substantially continuous arc surfaces. When the cap with elastic claws (not shown) is fitted to the can 1 of the packaging container of the present invention, the outer surface 9 of the outer curl 8 at the opening of the can has a gentle arc shape. The tip of the claw moves smoothly, the tip of the claw of the cap with elastic claw does not get caught, the claw is not deformed or damaged, and the following gentle arc-shaped inclined portion 3 is moved to engage the neck 4. Combine. The gentle arc surface of the outer surface 9 of the outer winding curl portion 8 and the gentle arc surface of the gentle arc-shaped inclined portion 5 are formed as a substantially continuous gentle arc surface, so that the resin attached to the cap is formed. The contact area with the packing (not shown) is increased, and the sealing performance is improved.
[0013]
The distal end portion of the outer curl portion 8 is bent upward inward to form a distal end bent portion 10, and the distal end bent portion 10 is formed so as to be in surface contact with the concave engaging portion 6. With the above configuration, the strength of the opening of the can mouth is increased, and the occurrence of dust, etc. is prevented.
[0014]
Since the distal bent portion 10 of the outer curl portion 8 is disposed inside the outer curl portion 8, the content liquid of the packaging container does not enter the outer curl portion 8, and the content liquid of the tip cut surface 11 does not penetrate. The generation of rust due to contact is suppressed.
[0015]
【The invention's effect】
Since the opening of the can of the packaging container of the present invention is formed by the outer curl portion, the content liquid does not infiltrate into the curl portion, and the content liquid of the tip cut portion of the outer curl portion is not formed. There is no problem of rust due to contact and solidification of the content liquid that has entered the curled portion.
Forming a concave engaging portion extending inward from the gentle arc-shaped inclined portion of the present invention and slightly sinking downward, and forming a horizontal step portion extending horizontally inward from the concave engaging portion; In order to wind the outer curl portion from the end of the portion, the outer surface of the outer curl portion is formed into a gentle arc shape, and a gentle arc substantially continuous with the upper surface of the gentle arc-shaped inclined portion is formed. It is possible to make it an arc surface, and the gentle arc-shaped outer surface makes the mounting of the cap smooth, prevents deformation and breakage of the cap claw at the time of mounting, and attaches to the cap because of the gentle arc surface The contact area with the resin packing to be formed increases, and the sealing performance is improved.
A configuration in which a tip bent portion is formed by raising and bending the tip of the outer curl portion of the present invention inward upward, and the tip bent portion of the outer curl portion is brought into surface contact with the concave locking portion to engage therewith. Thereby, the strength of the opening of the can mouth is increased, and the occurrence of dust, etc. is prevented.
[Brief description of the drawings]
1A and 1B are views showing an embodiment of a can mouth of a packaging container of the present invention.
FIG. 2 is a view showing a can mouth of a conventional packaging container.
FIG. 3 is a view showing a can mouth of a conventional packaging container.
[Explanation of symbols]
1: can mouth of packaging container 2: can mouth caulking portion 3: cylindrical rising portion 4: neck portion 5: gentle arc-shaped inclined portion 6: concave engagement portion 7: horizontal step portion 8: outer curl portion 9 : Outer side surface of outer winding curl part 10: Tip bending part 11: Tip cutting surface 12: Inner winding curl part 13: Steep arc-shaped inclined part 14: Winding base part 15: Outer winding opening winding part 16: Tip part

Claims (1)

At the lower end, a can-mouth caulking portion for fixing to a can-mouth attachment portion opened to the top plate of the packaging container is formed, and a cylindrical rising portion that rises almost vertically above the can-mouth caulking portion is formed. Forming a neck portion that protrudes in an arc inward from the end of the cylindrical rising portion, forms a gentle arc-shaped slope at the top of the neck, and forms an inside from the end of the gentle arc-shaped slope. Forming a concave locking portion extending in the direction and slightly sinking downward, forming a horizontal step portion extending horizontally inward from an end of the concave locking portion, and rising upward from an end of the horizontal step portion. An outer curl portion curled in a gentle arc outward is formed, and a tip bent portion is formed by bending the tip of the outer curl portion upward inward. So that it engages in contact with the locking part The can opening of the packaging container, characterized in that the said outer winding curl portion outer surface gentle arc surface shape loose the arcuate inclined portion of the top surface and substantially continuous gentle arc surface of the.

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