JPS591360A - Sealed vessel and its manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealed container and a method for manufacturing the same, and more particularly to a sealed container in which an easily openable metal lid having a tear tab is wrapped around the mouth of the container and a method for manufacturing the same.

As shown in FIG. 1, it has a top plate 2, a skirt part 3 hanging down from the peripheral edge of the top plate 2, a tear tab 4 projecting from the lower end of the skirt part 3, and a base of the tear tab 4. A notch portion 5 is formed at the lower end of the skirt portion 3 in contact with both side edges of the skirt portion 3, and extends from the notch portion 5 up the outer surface of the skirt portion 3, extends along the top plate 2, and connects to the tear tab 4 of the skirt portion 3. Score part 6 having an end 6a in the middle of the opposing part 3a
Easy-to-open metal lid 1 (hereinafter referred to as metal lid) formed with
Recently, it has been put into practical use for sealing the mouth of containers.

Note that 7 is a reinforcing rib.

FIG. 2 shows a conventional example in which the metal lid 1 is wrapped around a container opening 8 having a bead portion (see 10 in FIG. 4) and a cylindrical neck portion \9 (hereinafter referred to as the neck portion). The height h of the skirt portion 3' after seaming is substantially equal along the circumferential direction, and the height h of the skirt portion 3' is substantially equal to the neck portion 9 below the bead portion 10. The height h of the hem 3'a / (in this specification, the height h' of the hem)
is defined by the distance in the axial direction between the lower end (3'b) of the skirt portion after seaming and the curved line (3'c).

) are also substantially equal along the circumferential direction. The height of the notch portion 5 is usually set to about 0.5 mm in order to prevent the portion near the end of the score portion 6 on the tear tab 4 side from breaking during molding of the metal lid 1, and to facilitate the initiation of tearing. It is being Therefore, if the height h' of the hem part 3'a is about 0.5 mm or less, the upper end of the notch part 5' after seaming will reach almost the lower end of the bead part 10, and it will be filled with beer, carbonated drinks, etc. Pressure resistance (evaluated by the pressure at which the metal lid starts to come off when the internal pressure is increased in a short period of time) and sealing performance (evaluated by the pressure at which the metal lid starts to come off when the internal pressure is increased for a short period of time) Leakage through the interface with the gasket (see 12 in Figure 4) is reduced. Therefore, the height h' of the hem 3'a becomes relatively high almost uniformly along the circumferential direction.
1 occurs.

Therefore, when the mouth part 8 is made of a metal plate, especially a metal plate as thin as 0.3 mm (for example, an aluminum alloy plate with a thickness of 0.23 mm), the part of the neck part 9 corresponding to the vertical wrinkles 11 is recessed. This not only impairs the appearance after opening, but also causes damage to the protective coating on the inner surface of the recessed portion, resulting in a loss of corrosion resistance. If the seaming force in the radial direction is reduced in an attempt to prevent the formation of the above-mentioned dents due to the vertical wrinkles 11,
A problem arises in that pressure resistance and sealing performance are impaired. In addition, this is a common problem when the container opening is made of a metal plate, plastic, or glass.The hem 3'a1, located opposite the tear tag, comes off from the bead at the very end when the container is opened. Since the metal lid is relatively high, it has the disadvantage that it is difficult to remove the metal lid from the container mouth.

It is an object of the present invention to solve the problems of the prior art described above.

In order to achieve the above object, the present invention provides a top plate, a skirt portion,
and a tear tab protruding from the lower end of the skirt portion, rising up the skirt portion from both side edges of the base of the tear tab, extending along the top plate, and opposing the tear tab of the skirt portion. A seal made by wrapping an easy-to-open metal lid formed with a pair of score parts having ends in the middle of the parts around a container mouth part having a cylindrical neck part and a bead part formed on the upper part of the neck part. To provide a sealed container, wherein the height of the hem of the skirt portion after seaming is lower near the tear tab than in the vicinity of the tear tab. It is something.

Further, the present invention includes a top plate, a skirt portion, and a tear tab protruding from the lower end of the skirt portion, rising up the skirt portion from both side edges of the base of the tear tab, and extending along the top plate. , a pair of score portions each having an end are formed in the middle of a portion of the skirt portion facing the tear tab, and a bump gasket is provided.

In a method for manufacturing a sealed container, the container has a cylindrical neck portion and a bead portion formed at the top of the neck portion. The height of the hem of the skirt portion after seaming is characterized by making the amount of compression of the gasket on the side larger than the amount of compression of the gasket on the side opposite to the tear tab, The present invention provides a method for manufacturing a sealed container in which the tear tab is also lowered near the portion facing the tear tab.

The present invention will be described below with reference to the drawings which are examples.

In FIGS. 3, 4, and 5, parts with the same reference numerals as those in FIGS. 1 and 2 indicate similar parts.

In FIGS. 3 and 4, the container opening 8 is made of a metal plate (such as an aluminum alloy plate, a tin-plated steel plate, or a tin-free steel plate), and has a hollow bead portion 10 with a trapezoidal cross section.
is formed. A metal lid 1 shown in FIG. 1 is wrapped around the container opening 8 to form a sealed container (not shown). The height (h) of the wrapped skirt portion 3' becomes gradually lower from the vicinity of the tear tab 4 toward the portion facing the tear tab 4 (although it is lowered linearly in Fig. 3). , may be lowered in a curved manner), and the height h'2 of the hem portion 3'a2 in the vicinity of the tear tab 4
is the hem 3 in the vicinity of the part facing the tear tab 4
The height of 'a1, ht, is also higher.

The difference between h'2 and ht is preferably 0.3 m or more,
It is set to be 15 or less, more preferably ld, 0.7 wn or more, and 1.2 or less.

Therefore, ht is a relatively low preferred value of about 0.5
Even if it is 0.7 mm, it is possible to prevent the notch portion 5' after seaming from reaching the lower end of the bead portion 10, thereby preventing a decrease in pressure resistance and sealing performance.

Furthermore, there are no vertical wrinkles 11 in the hem portion 3'a1 near the portion facing the tear tab 4, but they are very fine!
;' (because h't can be lowered), and near the tear tab 4, the hem 3'a2 moves toward the hem 3'a1 during seaming, so the vertical wrinkles 11 are The occurrence is reduced compared to the conventional case of h2'kih,/.

Furthermore, since h1' can be made low, the metal lid 1 can be easily removed from the bead portion 10 when opening the cap.

FIG. 5 shows a hem portion 3'a2 near the tear tab 4.
, an example is shown in which the intermediate part 3'a3 that moves to the hem part 3'a1 in the vicinity of the part facing the tear tab 4 forms an inclined part, and the hem part height is reduced from h2' to ht. 3, and the same effects as in the example shown in FIG. 3 can be achieved.

The sealed container as described above can be manufactured as follows.

6(a), (b), and FIG. 7, reference numeral 15 denotes a seaming tool, which includes a metal lid suppressing body 16, a plurality of seaming claw pieces 17, and an elevating ring for opening and closing the claw pieces 17. body 18 and a guide ring 19 screwed onto the lower end of the lifting ring body 18
It is equipped with Further, a pressing rod 20 biased by a pressing spring 21 is inserted into the central hole 16J1 of the pressing body 16. At the top of the suppressor 16, there are 4
．． A horizontal plate 22 is fixedly installed, and as shown in FIG.
The rotation is stopped.

The lower surface 16b' of the pressing part 16b of the pressing body J6 consists of a central plane part 1"b1' and a peripheral curvature part 16b2', and the central plane part 16bl' is on the tear tab 4 side of the metal lid 1 to be tightened ( In the sealing process, the tear tabs 4 placed on the opening of each container are aligned in a certain direction and conveyed below the sealing tool 15. When each axis of the container opening 8 is vertical), the slope is preferably approximately (0.5 to 1).
(hz'ht")/outer diameter of the metal lid 1. The seaming tool 15 is tightened by a drive mechanism (not shown) that is fixed to the upper lid 25 through bolt holes 25a. It is lifted and lowered vertically during work.

Now the metal lid 1 (the height of the skirt part 3 is substantially equal along the circumferential direction, except for the part connected to the tear tab 4)
When the tightening tool 15 is lowered by a lifting mechanism (not shown) toward the container opening 8, the lower end 20a of the pressing rod 20 first touches the center of the top plate 2, as shown in FIG. 6(a). Press.

At this time, if the strength of the pressing spring 21 is set to be relatively small (lower than the conventional case), the inner cheek portion 19B of the guide ring 19 will hit the tear tab 4, and the metal lid 1 will tear away from the tear tab. 4, the inner surface of the skirt portion 3al facing the tear tab 4 contacts the outer surface of the bead portion 10, while there is a gap between the inner surface of the skirt portion 3a2 on the tear tab 4 side and the bead portion 100. 28 (usually a radial distance of about 0.3 w+m ) is formed because the inner diameter of the skirt portion 3 is slightly larger than the outer diameter of the bead portion 10. By lowering the ring descending bodies 18, which become smaller as they move away from each other in the circumferential direction, the claw pieces 17 are moved inward in the radial direction to perform seaming.

At this time, in the lower surface 16b' of the pressing portion 16b, since the tear tab 4 side is lower, the portion of the gasket 120 on the tear tab 4 side has a larger amount of crushing (compression amount) than the portion facing it.

Therefore, the height h of the hem of the tear tab 4 Mill after seaming
2' is lower surface 16b than the height hl' of the opposing hem.
′ becomes larger corresponding to the slope of ′. At this time, the top plate 2 is pulled toward the tear tab 4 side, and the peripheral portion of the top plate 2 corresponding to the gap 28 and its vicinity forms the upper part of the skirt portion 3' after being tightened. Therefore, the height of the skirt portion 3' after tightening, and therefore the height of the hem portion 3'a, is higher than the vicinity of the tear tab 4.
Along the circumferential direction, the height becomes lower toward the portion facing the tear tab 4.

” The upper limit of the slope 1, H2'ht' /
The outer diameter of the metal lid 1 is applied when the strength of the pressing spring 21 is increased to the conventional level so that the top plate 2 is not drawn toward the tear tab 4 during tightening. On the other hand, the lower limit, approximately 0.5 The method of increasing the amount of tension so that the top plate 2 is sufficiently pulled toward the tear tab 4 side is not limited to the above example, for example, without creating a slope on the lower surface 16b' of the pressing part 16b,
Tightening may be performed by using a normal seaming tool having a suppressing part 16b and tilting the suppressing body 16 by a predetermined slope so that the pressing part 16b becomes lower on the tear tab 4 side during tightening.

In the above case, a normal metal lid was used in which the height of the skirt portion is substantially equal along the circumferential direction, but the height of the skirt portion 3 near the tear tab 4 is near the portion facing the tear tab 4. The hermetically sealed container of the present invention can also be manufactured by using a metal lid that is taller than the skirt portion 3 of the lid and tightening it by a conventional method.

For example, as shown in FIG. 8, such a metal lid is formed by drawing the metal lid blank 34 with a punch 35 to form a skirt portion. It can be formed by slightly shifting the center O' of the punch 25 to the opposite side of the part 4' of the plank and ri, which is to become the tear tab.

Alternatively, as shown in FIG. 9, the shape of the main portion 44'a of the metal camp blank 44' is not a perfect circle, but the shape is short in the radial direction between the peripheral edge 44'al and the perfect circle 46.
A predetermined distance X gradually increases from the portion 4' which is to become the tearing tab of the blank toward the portion 44'b opposite to the portion 4'. The center 0' of the punch 45 is set to match the center 0 of the perfect circle 46,
The metal lid as described above can also be manufactured by forming the skirt portion by drawing.

The present invention is not limited to the above embodiments,
For example, the notch portion 5 is not provided, and the tear tab 40
It may also be a metal lid that is easy to open and has score portions 6 formed directly from both side edges of the base. When such a metal lid without a notch is wrapped around a container opening 8 having a bead 10 and a cylindrical neck 9, the score portions on both sides of the base of the tear tab are aligned with the circumference of the skirt portion. By shrinking and deforming in the direction, the torn hole is weakened and a notch substantially equivalent to a notched metal lid is formed.

Furthermore, the pair of score portions along the top plate may extend in a substantially linear shape toward the end.

According to the present invention, the height of the hem after seaming is lower in the vicinity of the part facing the tear tab than in the vicinity of the tear tab. This prevents dents in the neck of the container mouth, prevents deterioration of the corrosion resistance of the inner surface of the neck due to damage to the paint film, and also impairs the appearance of the neck after opening. It is possible to achieve the effect that

Since there is no concern about the occurrence of large vertical wrinkles, the seaming force in the radial direction can be increased, which has the advantage of improving pressure resistance and sealing performance.

Furthermore, since the height of the hem facing the tear tab can be made lower than before, the force required to remove the lid at the end of opening the bottle is small, and the lid comes off smoothly, making it easier to open the bottle. It has the advantage that there is no risk of the liquid content etc. being scattered due to impact.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an example of a metal lid applied to the present invention, Figure 2 is a perspective view of an example of a metal lid applied to the present invention;
The figure is a front view of essential parts of an example of a conventional sealed container sealed with the metal lid shown in FIG. 1, and FIG. 4 is a longitudinal sectional view passing through the center and axis of the tear tab in FIG. 3, FIG. 5 is a front view of the main part of a sealed container according to another embodiment of the present invention, and FIG. FIG. 6(a) is a longitudinal sectional view of a main part showing the seaming process for manufacturing the sealed container shown in the figure, FIG. 6(a) is a drawing showing the initial state of seaming, and FIG. 6(b) is a drawing after seaming is completed. 7 is a cross-sectional view taken along the line ■-■ of FIG. 6(a), and FIG. 8 is a metal lid blank for forming an example of the metal lid applied to the present invention. FIG. 9 is a plan view of another example of a metal blank for forming an example of a metal lid applied to the present invention. 1... Metal lid that is easy to open, 2... Top plate, 3... Skirt part, 3'... Skirt part after seaming, 3'a...
・Hem part, 4...Tear tab, 6...Score part, 6a
...End, 8...Container mouth, 9...Neck, 1
0...Bead part, 12...Gasket. Patent applicant Akira Kishimoto

Claims (2)

[Claims] (1) A top plate, a skirt portion, and a tear tab protruding from the lower end of the skirt portion, rising up the skirt portion from both side edges of the base of the tear tab and extending along the top plate, the skirt an easy-to-open metal lid formed with a pair of score parts having ends in the middle of the part facing the tear tab, a cylindrical neck part and a bead part formed on the top of the neck part; In a sealed container formed by wrapping the container mouth, the height of the hem of the skirt portion after wrapping is lower in the vicinity of the tear tab as well as in the vicinity of the portion facing the tear tab. A sealed container characterized by: (2) A top plate, a skirt portion, and a tear tab protruding from the lower end of the skirt portion, rising up the skirt portion from both side edges of the base of the tear tab, extending along the top plate, and the skirt portion; A cylindrical neck portion and an easy-to-open metal lid provided with a gasket and formed with a pair of score portions having an end in the middle of the portion facing the tear tab of the portion are formed on a cylindrical neck portion and an upper portion of the neck portion. In the manufacturing method of a sealed container formed by wrapping the container around the mouth of the container having a bead, the amount of crushing of the gasket on the tear tab side during tightening is as follows:
The amount of compression of the gasket on the side facing the tear tab is also increased, and the height of the hem of the skirt portion after seaming is higher than the height near the tear tab. A method for manufacturing a sealed container that is lower near a portion facing the container.