JPH085506B2 - Can container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a can container for containing a so-called pressure fluid, such as an aerosol can, and more particularly to a pressure release structure.

[Prior Art] In order to prevent the risk of the can being blown out when the pressure inside the can becomes abnormally high due to the throwing of the can into a fire or the rise in environmental temperature, a score is provided on the can that causes the pressure to increase. The means for gradually leaking the internal pressure (gas) from the dehiscence portion is disclosed in, for example, Japanese Patent Publication No. 51-31606 and Japanese Utility Model Publication No. 57-123.
Known from publication 20.

[Problems to be Solved by the Invention] As shown in FIG. 4, the former of the above-described prior art is the top of the winding portion of the dome-shaped metal lid (b) wound around the can body (a), that is, the winding. A score (d) is provided in the range that extends from the middle of the vertical cover plate part (c) that abuts and hangs along the inner wall of the can body by tightening to the top of the winding tightening. Works in the direction of the arrow and penetrates into the contact part between the inner wall of the can body and the vertical cover plate part (C), and the cover (B) bulges and deforms as shown in Fig. 5, resulting in a score (D). Is torn open, the gas inside is gradually leaked out, and blown off of the can is prevented, but the problem is that the score (d) is set in the winding range as described above, so the lid ( (B) is deformed to such an extent that the vertical lid plate part (c) and the top part connected to it rise up. The score (d) cannot be destroyed until the condition is reached, which is accompanied by the risk of a time delay that cannot immediately release the pressure when the internal pressure rises.

In addition, it must be said that providing the above score on the top of the can container is an irrational technique for weakening the strength of the can.

On the other hand, in the latter of the prior art, although not particularly shown, a score is provided at a position outside the winding portion on a dome-shaped bottom lid that swells upward in a can container and bulges upward, and as a function, the internal pressure rises. It is described that the lid plate is flipped downward by the above and the score is torn by deforming, but in the first place pressure is concentrated at the beginning of the winding tightening that communicates with the inside of the can body, that is, the winding tightening. The bulging deformation of the bottom lid starts from this crease, and even if pressure is applied to the surface of the bottom lid, this surface cannot be inverted downward, and therefore, according to the score according to the disclosed technique, It cannot be said that pressure release is impossible.

Therefore, in view of the former problem of the above-mentioned prior art, the present invention focuses on the fact that the internal pressure concentrates on the creases of the winding, and the score is provided on the creases, and the deformation starting from the creases does not yet spread to the tightening portion. The purpose is to rupture the score at this point, thus preventing the risk of blowout of the can caused by the delay of the pressure release time due to the time delay.

[Means for Solving the Problems] The present invention for achieving the above object is to tighten a peripheral edge of a dome-shaped metal lid that bulges upward around the upper end opening peripheral edge of the can body, and by this winding, the can body of the can body is closed. At the lower end of the vertical lid plate portion that abuts along the inner wall, the hem circumference of the dome is connected through an arc-shaped drop portion, and the lower surface of the drop portion connects the vertical lid plate portion and the inner wall of the can body. A gist of a can container communicating with the abutting part is characterized in that a score capable of tearing is provided in the drop part at a required interval in the circumferential direction.

[Example] 1 is a metal can body, and a dome-shaped metal lid 2 is wound around the periphery of the upper end opening of the can body 1. The bottom edge of the vertical lid plate portion 3 that abuts and hangs along the inner wall of the can body 1 by the above-mentioned winding, and the hem circumference of the dome is connected via an arc-shaped drop portion 4, and the lower surface of the drop portion 4 In the can container that communicates with the contact portion between the vertical lid plate portion 3 and the inner wall of the can body, scores 5 are provided in the drop portion 4 in the circumferential direction at predetermined intervals.

The score 5 is provided on the front surface side of the hem portion 4 in this example, but may be on the back surface side.

[Operation] When the internal pressure of the pressure can container becomes abnormally high, the pressure can container penetrates the lower surface of the drop portion 4, that is, the contact portion between the vertical lid plate portion 3 and the inner wall of the can body from the crease of the winding tightening portion, The drop portion 4 is deformed, the score 6 provided on the drop portion 4 is cleaved by this deformation, and pressure is released from the cleaved score 5.

[Effect of the Invention] As described above, according to the present invention, the hem circumference of the dome is dropped at the lower end of the vertical lid plate portion that naturally abuts along the inner wall of the can body when the lid is wound around the can body. Paying attention to the fact that the lower portion of the drop portion communicates with the contact portion between the vertical lid plate portion and the inner wall of the can body, since a score is provided in the drop portion, At the time when the recessed part starts to deform, in other words, the score is destroyed by the winding tightening that has not yet reached the winding tightening part, and it is possible to quickly release the danger. A pressure can container having a score at the top of the tightening portion can achieve a safe pressure releasing action which cannot be expected.

At the same time, since there is no score on the top of the winding fastening portion, it is possible to eliminate the weakening factor of the winding fastening portion.

[Brief description of drawings]

FIG. 1 is a front view of a pressure can container, FIG. 2 is a plan view of the same as above, FIG. 3 is an enlarged cross-sectional view of an essential part of the same, and FIG. 4 is a partial cross-sectional view of a conventional pressure can container, The figure is a cross-sectional view showing a pressure released state. 1 …… can barrel, 2 …… metal lid, 3 …… vertical lid plate part, 4 …… drop part, 5 …… score.

Claims (1)

[Claims] 1. A dome-shaped metal lid that bulges upward is wound around the upper end opening edge of the can body and the lower end of a vertical lid plate portion that abuts along the inner wall of the can body by this winding. In the can container in which the hem circumference of the dome is continuous through an arc-shaped drop portion, and the lower surface of the drop portion communicates with the contact portion between the vertical lid plate portion and the inner wall of the can body, in the drop portion, A can container characterized by being provided with a cleavable score at predetermined intervals in the circumferential direction.