JP2019081566A - Can container - Google Patents

Abstract

To enable an easily cracking part for releasing can inner pressure during an abnormal increase of the can inner pressure to function as appropriate.SOLUTION: The can container comprises a cylindrical can body and a can bottom connected to the can body that are integrally formed of a plate material specified with a rolling direction. The can bottom comprises an inward projecting annular bead arranged about a can axis, and an easily cracking part in which a crack occurs in a can bottom deformation mode along the can bottom deformation mode during an abnormal can inner pressure increase directed with respect to the rolling direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a can container in which a can body and a can bottom are integrally formed.

  In the case of a bottle can or other form of can, when the internal pressure of the can rises abnormally, the can bottom or the like is cracked or broken in a safe state to allow the can internal pressure to escape to the crackable portion or the breakable portion. What is equipped is known.

  The prior art described in the following Patent Document 1 is a bottle can that can be re-stopped by applying a cap, and by forming an easy-to-crack portion in the can bottom, the cap can be screwed with an abnormal can internal pressure Address the problem of getting out of the cap and coming off the cap.

  Further, in the prior art described in Patent Document 2 below, the annular ground portion formed at the lower end of the can container and the outer peripheral edge portion are connected to the annular ground portion and the can container from the inner peripheral surface of the annular ground portion. In the can container in which the inner surface of the dome portion is formed so that the vertical cross section is arc-shaped inward, the internal pressure of the can container rises abnormally and the dome portion protrudes outward of the can container There is provided an easy-to-break part that breaks when deformed into

JP 2004-115096 A Unexamined-Japanese-Patent No. 2006-51964

  In any of the above-described conventional techniques, when the pressure in the can container abnormally increases, the internal pressure is released at the crack easily portion or the break easily portion to thereby prevent the can container itself from being ruptured or the cap from being blown out. ing.

  A bottle can etc. that can be re-stopped by the deposition of a cap may be re-stopped in a state in which bacteria etc. enter into the can container after being opened once, and may be stored as it is for a long time. The internal pressure of the can may rise abnormally due to rot or the like. In addition, even if it is a two-piece can other than a bottle can, the internal pressure of the can may rise abnormally due to decay of the contents, etc., when the storage management state is bad.

  Can containers provided with easy-to-crack and easy-to-break parts as in the prior art mentioned above, in order to avoid leakage of the contents, rise in can internal pressure that may occur in normal storage management, and fall / fall during transportation etc. In the case of impact, it is required that the easily cracked portion and the easily broken portion do not open. However, if the pressure resistance condition and impact resistance condition of the crack easy part and the break easy part are set high, the easy crack part and the easy break part may not be opened even when the above-mentioned abnormal internal pressure increases, which is dangerous. There is a problem that it is impossible to avoid the can container rupture and the cap blowout accident.

  The present invention addresses such a situation, and has an object to properly function the easily cracked portion that opens the can internal pressure when the can internal pressure abnormally rises.

In order to solve such a subject, the can container of this invention comprises the following structures.
A can container obtained by integrally forming a cylindrical can body and a can bottom connected thereto from a plate material whose rolling direction is specified, wherein an inwardly convex annular bead is formed around the can axis at the can bottom. The can provided with a crack facilitating portion which is cracked by the can bottom deformation mode is provided along a can bottom deformation mode at an abnormal internal pressure rise which is provided and directed to the rolling direction. container.

  The can container of the present invention having such a feature is provided with an easy-to-crack portion in which the crack is generated only by the can bottom deformation mode, along the can bottom deformation mode at the abnormal can internal pressure rise directed to the rolling direction. Thus, when the abnormal in-can pressure rises, the crack easily can be effectively cracked to release the in-can pressure to the outside.

  By this, it can be made a crack easy part which does not produce a crack by an impact such as a rise of the can internal pressure which may occur in normal storage management or falling / falling during transportation, so that leakage of contents in normal time can be suppressed. As well as being able to open the crack easily part at the time of abnormal rise in pressure in the can, it is possible to avoid a dangerous can container rupture and a cap blowout accident.

It is an explanatory view showing a bottle can with a cap which is an example of a can container concerning an embodiment of the present invention. It is an explanatory view (sectional view) showing a can bottom of a can container concerning an embodiment of the present invention. It is explanatory drawing which showed the example of formation of a crack easy part provided in a can bottom (example which provided a crack easy part along the direction of 90 degrees or 270 degrees with respect to the rolling direction). It is explanatory drawing which showed the example of formation of a crack easy part provided in a can bottom (example which provided a crack easy part along the direction of 0 degree or 180 degrees with respect to the rolling direction). It is explanatory drawing which showed the example of formation of a crack easy part provided in a can bottom (example which provided a crack easy part along the direction of 45 degrees or 225 degrees with respect to the rolling direction). It is explanatory drawing which showed the example of formation of a crack easy part provided in a can bottom (example which provided a crack easy part along the direction of 135 degrees or 315 degrees with respect to the rolling direction). It is explanatory drawing which showed the example ((a) is an example of V groove shape, (b) is an example of U groove or rectangular groove shape) of the cross-sectional shape of a crack easy part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals in different drawings denote parts having the same functions, and redundant description in each drawing will be appropriately omitted.

  FIG. 1 shows a capped can, which is an example of a can container according to an embodiment of the present invention. In the can container (bottled can with cap) 1, the cap 3 is screwed to the cap portion 20 of the bottle can 2 and the contents are sealed.

  The bottle can 2 is a container axially symmetrical with respect to the can axis O, and the cylindrical can body 2A and the can bottom 2B connected to it are integrally formed, and the upper part of the can body 2A is directed upward A shoulder portion 2C whose diameter is gradually reduced is provided, and the above-described mouthpiece portion 20 is provided above the shoulder portion 2C.

  Such a bottle can 2 is integrally formed of a plate material rolled in a specific direction, and in the case of an aluminum bottle can, a cup serving as a base by adding a shallow drawing process to a circularly punched plate material Is formed, the cup is drawn and ironed, the cylindrical body is formed, and the shoulder 2C and the mouthpiece 20 are formed by trimming the upper portion and a plurality of neckings.

  The base portion 20 includes a screw portion (male thread) 21 to which the cap 3 is screwed, a cover portion 22 formed below the screw portion 21, and a curled portion 23 formed at the upper end portion of the base portion 20. Have.

  The cap 3 includes a top surface portion 30 and a peripheral wall portion 31 continuously provided below the outer peripheral edge of the top surface portion 30. The peripheral wall portion 31 is screwed to a screw portion (male thread) 21 of the mouth portion 20. A screw portion (female screw) 32 to be fitted and a breakable portion 33 formed below the screw portion 32 are provided. A plurality of scores 33a penetrating in the thickness direction of the peripheral wall portion 31 are formed at predetermined intervals in the circumferential direction, and the bridge 33b is formed between the adjacent scores 33a.

  A liner material 34 formed of a synthetic resin is disposed on the inner surface of the top surface portion 30 of the cap 3. In order to seal the mouthpiece portion 20 with the cap 3, the lower end portion of the peripheral wall portion 31 is wound around the cover portion 22 with the liner material 34 in close contact with the curled portion 23 of the mouthpiece portion 20. The screw portion 32 of the cap 3 is screwed to the portion 21.

  As shown in FIG. 2, an inwardly convex annular bead 10 is provided around the can axis O on the can bottom 2 </ b> B of the bottle can 2. In the illustrated can bottom 2B, an annular ground portion 11 convex downward is formed on the outside of the annular bead 10, and on the inside of the annular bead 10, perpendicular to the can axis O A flat portion 12 is provided.

  Such a can container (cap can with bottle can) 1 has an abnormal rise in the internal pressure of the can that exceeds the cap retention obtained when the screw portion 32 of the cap 3 is screwed to the screw portion 21 of the mouthpiece 20 When it occurs, it has been confirmed that a special deformation mode called so-called cornering deformation occurs in which the annular bead 10 provided in the can bottom 2B and the periphery thereof partially project outward, and this special It has been confirmed that the deformation mode (hereinafter referred to as can bottom deformation mode) has a certain directionality with respect to the rolling direction of the plate material on which the bottle can 2 is formed.

  The above-described can bottom deformation mode may show different modes depending on the can bottom area, the form of annular bead (depth and diameter, etc.) or the material of the plate material, but the bottle can 2 formed under the same design conditions In the second embodiment, substantially the same deformation mode is obtained.

  To illustrate the relationship between the directionality of the can bottom deformation mode and the rolling direction of the plate material, the directions of 90 ° and 270 ° around the can axis O with respect to the rolling direction (direction orthogonal to the rolling direction) As a deformation mode, the directions of 0 ° and 180 ° around the can axis O (the same direction as the rolling direction) can be set as another can bottom deformation mode with respect to the rolling direction. In such a can bottom deformation mode, one can be a primary can bottom deformation mode and the other can be a secondary can bottom deformation mode.

  In the primary can bottom deformation mode and the secondary can bottom deformation mode, when an abnormal rise in the can internal pressure occurs, the annular bead 10 formed in the can bottom 2B and its periphery, linear along the above-mentioned direction Deformation occurs. The cornering deformation that occurs in the primary can bottom deformation mode and the secondary can bottom deformation mode may occur simultaneously with deformation on both sides of the can axis O, or when deformation on both sides of the can axis O occurs at different timings There is also.

  Also, the timing of the primary can bottom deformation mode and the secondary can bottom deformation mode is such that if the can internal pressure continues to rise after the can internal pressure rises and the deformation of the primary can bottom deformation mode occurs, the secondary can bottom Deformation of deformation mode occurs.

  The embodiment of the present invention focuses on the can bottom deformation mode which occurs at the time of an abnormal rise in the can internal pressure, and by providing the easily cracked portion where opening (crack generation) is promoted by this can bottom deformation mode, the can internal pressure is abnormal. The crack easy part which releases can internal pressure at the time of rise is functioning properly. The directionality of the can bottom deformation mode in one bottle can 2 can be experimentally confirmed by adding an abnormal in-can pressure rise to a bottle can formed under the same design condition.

  3 to 6 show an example of formation of the easily cracked portion provided in the can bottom. Arrow R of illustration has shown the rolling direction of the board | plate material with which the bottle can 2 is shape | molded. In the example shown in FIG. 3 and FIG. 4, the directionality of the primary can bottom deformation mode is 90 ° and 270 ° around the can axis O with respect to the rolling direction (arrow R direction) (in the direction of the arrow S1 shown) And the directionality of the secondary can bottom deformation mode is 0 ° and 180 ° (in the direction of the arrow S2 shown) around the can axis O.

  In the example shown in FIG. 3, the crack facilitating portion 4 is provided around the can axis O along the 90 ° and 270 ° (the direction of the arrow S1 in the drawing) with respect to the rolling direction (the direction of the arrow R). The easy-to-crack part 4 can be formed linearly by scratching, coining, embossing, thin-walling, etc., and the cross-sectional shape thereof can be easily cracked by the generation of the can bottom deformation mode. It may be of any shape. As an example of the cross-sectional shape, it can be in the form of V groove as shown in FIG. 7 (a) or in the form of U groove or rectangular groove as shown in FIG. 7 (b). At this time, the groove may be formed on either the outer surface side or the inner surface side of the can, or both of them.

  In the illustrated example, two easily cracked parts 4 are provided symmetrically with respect to the can axis O, but any one of them may be provided. In the illustrated example, the formation position of the easily cracked portion 4 is formed to cross the deepest portion of the annular bead 10. The deepest part of the annular bead 10 is the part with the largest amount of deformation in the can bottom deformation mode, so the crack easily part 4 is reliably opened in the can bottom deformation mode by providing the easily cracked part 4 across this. It can be (broken). The length of the easily cracked part 4 in this case may be as long as it crosses the deepest part of the annular bead 10, and the length is not particularly limited, but it is about 1 to 3 mm inside and outside from the center of the deepest part It is preferable to set to about).

  Moreover, in the example of illustration, the crack easy part 4 is radially formed with respect to the can axis | shaft O. As shown in FIG. Thus, when the easily cracked portions 4 are formed radially, the easily cracked portions 4 are formed on the plate material or a cup formed by applying a shallow drawing process to the plate material, and then the forming process by drawing and ironing the bottle can 2 is performed. When it is performed, it is possible to prevent the crackable portion 4 from being broken due to the distortion at the time of molding. The easy-to-crack part 4 may be formed at any stage of the forming process of the bottle can 2, but by forming the easy-to-break part 4 at the stage of the plate before forming process or simultaneously with cup forming or after cup forming, Positioning of the plate in the rolling direction is facilitated.

  In the example shown in FIG. 4, the crack facilitating portion 4 is provided around the can axis O along the direction of 0 ° or 180 ° (the direction of the arrow S2 shown) with respect to the rolling direction (the direction of the arrow R). In this example, by providing the easily cracked portion 4 along the secondary can bottom deformation mode, leakage of the contents can be avoided in the primary can bottom deformation mode in which the pressure in the can is relatively low, and the internal pressure of the can can be reduced. The easily cracked portion 4 can be opened in the secondary can bottom deformation mode immediately before the dangerous pressure state is reached. Also in this example, as in the example shown in FIG. 3, two easily cracked portions 4 are provided symmetrically with respect to the can axis O, but any one may be provided.

  In the example shown in FIGS. 5 and 6, the directionality of the primary can bottom deformation mode is 45 ° and 225 ° around the can axis O with respect to the rolling direction (the arrow R direction) (the direction of the arrow S3 shown) , The directionality of the secondary can bottom deformation mode is the direction of 135 ° and 315 ° (in the direction of the arrow S4 shown) around the can axis O. In the example shown in FIG. 5, the easily cracked portion 4 is provided along the direction of the primary can bottom deformation mode (the direction of the arrow S3 shown). Moreover, the example shown in FIG. 6 has provided the crack easy part 4 along the direction (indication arrow S4 direction) of secondary can bottom deformation mode. As described above, when it is confirmed that the directionality of the can bottom deformation mode is the predetermined direction, the easily crackable portion 4 can be appropriately provided along the direction.

  As explained above, the can container 1 which concerns on embodiment of this invention pays attention to the can bottom deformation mode at the time of the abnormal can internal pressure rise orientated with respect to the rolling direction (arrow R shown), and the can bottom deformation. Since the easily cracked portion 4 is provided along the mode, the easily crackable portion 4 can be effectively broken and the in-can pressure can be released outside only when the abnormal in-can pressure rises.

  In this case, the breaking strength of the easily cracked portion 4 can be set so that no crack is generated by an impact such as a rise in the inner pressure of the can which may occur in ordinary storage management or falling or falling during transportation. And leakage of contents at normal times can be suppressed. And, at the time of abnormal rise in pressure in the can, since the crack easy portion can be reliably opened using the can bottom deformation mode, dangerous explosion of the can container and blowout of the cap can be avoided in advance. Can.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and changes in design etc. within the scope of the present invention are not limited. Are included in the present invention. In particular, although the embodiment has been described by taking a capped can as an example, the can container according to the embodiment of the present invention is not limited to this, and a two-piece can in which a can body and a can bottom are integrally formed. Even if so, it is possible to provide an easily cracked portion as well.

  In addition, the respective embodiments described above can be combined with each other by utilizing the techniques of each other unless there is a contradiction or a problem in particular in the purpose, the configuration, and the like. Specifically, the crack easy portion 4 can be provided along all the directions of arrows S1 to S4 shown in FIGS. 3 to 6, and along a direction arbitrarily selected from the directions of arrows S1 to S4. , The crack easy part 4 can be provided in at least one place.

1: canned container,
2: Bottle can, 2A: can body, 2B: can bottom, 2C: shoulder,
20: base part, 21: screw part, 22: cover part, 23: curl part,
3: Cap, 30: top surface, 31: peripheral wall, 32: screw,
33: easily breakable part, 33a: score, 33b: bridge,
4: Easy cracked part, O: can axis

Claims (6)

A can container in which a cylindrical can body and a can bottom connected thereto are integrally formed from a plate material whose rolling direction is specified,
An inwardly convex annular bead is provided around the can axis on the can bottom, and the can bottom deformation is performed along the can bottom deformation mode at the time of an abnormal internal pressure rise that is directed with respect to the rolling direction. The can container characterized by the crack easy part which a crack produces by mode. The can bottom deformation mode includes a primary can bottom deformation mode which is caused by an increase in the internal pressure of the can and a secondary can bottom deformation mode which is subsequently generated.
The can container according to claim 1, wherein the easily cracked portion is provided along the secondary can bottom deformation mode.   The crackable portion is provided at at least one position along any of 0 °, 90 °, 180 °, and 270 ° around the can axis with respect to the rolling direction. 2 The can container of 2 description.   The crackable portion is provided at at least one position along any of 45 °, 135 °, 225 °, and 315 ° around the can axis with respect to the rolling direction. 2 The can container of 2 description.   The can container according to any one of claims 1 to 4, wherein the easily cracked portion is formed to cross the deepest portion of the annular bead.   The can container according to any one of claims 1 to 5, wherein the easily cracked portion is formed radially with respect to the can axis.

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