JP2642110B2 - Double winding can lid and manufacturing method thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a can lid that is double-wrapped around an opening of a can body and a method for producing the same.

(Prior Art) In order to avoid improper tightening or the like in the canned portion of the can lid of this type of double-cranked can, various dimensions of the wound portion as shown in FIG. The dimensions of the winding height A, the body hook B, the cover hook C, and the overlap D are set.

Therefore, in order to secure such a dimension of the tightened portion of the can lid, conventionally, first, the can lid 1 is firstly pressed by a press working as shown in FIG.
2.05 to 2.15 mm, the radius of curvature Q of the seaming panel 3
4.0 to 4.45 mm, the radius of curvature P of the curl portion 4 is 0.5 to 1.0 mm,
Further, the length L of the straight portion 5 at the curl portion is processed to be 0.9 to 1.2 mm, and the angle of the side where the straight portion 5 enters as shown in FIG. The curled portion 4 is curled using a curling groove having an angle of 18 ° to 25 ° on the side to be formed, so as to have a shape having a joint portion continuous with the flange portion 6a of the can body 6 as shown in FIG. Was.

However, in recent years, in order to reduce the manufacturing cost of the can, the so-called lid leg length S of the can lid 1 shown in FIG. 5 is shortened as shown by S1 in FIG.
As shown in the drawing, a method has been attempted in which a double-sealed portion having a smaller and equal sealing property as compared with the conventional tightened portion shown in FIG. 4 is formed.

The shape of this can lid 1 is a seaming panel radius part 2
Has a radius of curvature R1 of 2.05 to 2.15 mm, a radius of curvature Q1 of the seaming panel portion 3 of 4.0 to 4.45 mm, and a radius of curvature P1 of the curl portion 4.
0.5 to 1.0 mm, which is the same as the conventional one, but the length L1 of the tip straight part 5 of the curl part 4 is 0.6 to 1.0 mm, and by further shortening the length of the seaming panel part 3 from the conventional one, The length of the can leg has been shortened, and the amount of material used has been reduced.

When the curled portion 4 of the can lid 1 is curled by the curling groove shown in FIG. 6 in the same manner as in the related art, the can lid 1 having the shape shown in FIG. 10 is obtained.

In this shape, the shoulder angle {1} of the shoulder portion 7 with respect to the chuck panel center 8 is relatively large, 16 [deg.] To 19 [deg.], And the straight end portion 5 of the curl portion 4 shortens the seaming panel portion 3 so that after the curling, Eleventh
As shown in the drawing, a slight return occurs due to the restoring force of the vicinity, and the angle is relatively large, 35 ° to 45 ° below horizontal.

When the double-tightening is performed on the flange portion 6a of the can body 6 using the can lid 1 shown in FIG. 10 for obtaining the conventional small double-tightening, the can leg length S1 of the can-lid 1 is obtained. And the shoulder angle Θ1 of the shoulder portion 7 is relatively large, so that the flange portion 6a of the can body 6 and the can lid 1 are conventionally formed to a predetermined length as shown in FIG. As shown in FIG. 10, a gap a is formed in the portion that has been continuously joined,
The tip of the flange 6 a of the can body 6 abuts on the surface of the can lid 1.

As a result, at the time of double winding, the tip of the flange portion 6a pierces the can lid 1, and the winding proceeds while shaving a sealing rubber (not shown) coated on the surface of the can lid 1, so that the The flange portion 6a of 6 floats the resistance, so that the portion to be the body hook portion B shown in FIG.
The length of the portion is not sufficient, or the end of the curl portion 4 breaks from the portion where the end of the flange 6a abuts the can lid 1.

Further, the length L1 of the straight portion 5 at the tip of the curl portion 4 is relatively long, and the downward angle of the straight portion 5 at the tip of the curl portion 4 with respect to the horizontal is as large as 35 ° to 45 °. The tip end of the can 5 comes into contact with the side wall of the can body and is wound while receiving resistance, so that wrinkles are generated in the portion to be the cover hook portion C shown in FIG. 9 and the can body 6 is easily damaged or cracked.

For this reason, it is difficult to form the portion that becomes the cover hook portion C, and the length of the portion becomes insufficient, and the length of the portion that becomes the overlap portion D also becomes difficult to obtain sufficiently.

Therefore, according to such a method, the length of various portions, for example, the lengths of B and C in the double wound portion cannot be obtained as predetermined, so that leakage of the content is likely to occur. Damage the side wall of the tightened part.

(Problems to be solved) In order to cope with such a problem, the present invention can provide a good and reliable double-tightening with the can body flange portion as before even if the length of the lid leg of the can lid is made shorter than before. It is an object of the present invention to provide a can lid which can be formed, and which can form a double-sealed portion having a smaller shape as compared with the related art, and a method for manufacturing the same.

(Means for Solving the Problems) In order to achieve the above object, the can lid according to the first invention has a shoulder angle of 10 ° to the chuck panel center.
A shoulder of 15mm range, a seaming panel radius of 1.7-2.0mm radius of curvature, and a radius of curvature of 4.5
Seaming panel area of ~ 5.3mm and radius of curvature 1.1
And a straight portion at the tip of the curled portion forms an angle of 0 ° to 25 ° downward with respect to the horizontal and has a length of 0.1 to 0.4 mm. There is a feature.

Further, in the method for manufacturing a can lid according to the second invention of the present invention, the radius of curvature of the seaming panel is formed in the range of 1.7 to 2.0 mm, and the radius of curvature of the seaming panel is formed in the range of 4.5 to 5.3 mm, In addition, the press die center in the seaming panel section was moved from the chuck panel center by 4.6
The curl part has a radius of curvature of 1.1 to 1.
Press working step of forming in the range of 3 mm, further forming the length of the straight portion of the curl tip in the range of 0.1 to 0.4 mm,
Next, the curled portion is 13 ゜ -17 on both sides from the center line.
And a curling step of curling using a curling groove that forms an angle in the range of ゜ and has a total angle in the range of 26 ° to 34 °.

(Operation) In the first aspect of the means, the shoulder portion has a shoulder angle in a range of 10 ° to 15 ° with respect to the chuck panel center, and the seaming panel radius portion has
The can lid and can body having a shorter radius of the lid legs than before by having a radius of curvature in the range of 1.7 to 2.0 mm and the seaming panel portion having a radius of curvature in the range of 4.5 to 5.3 mm. During the double winding of the can lid, a continuous connection portion of a predetermined length is formed between the can lid and the can body flange portion, and the tip of the can body flange portion is formed on the surface of the can lid. Eliminate the end. Further, the curl portion has a radius of curvature in the range of 1.1 to 1.3 mm, and the length of the straight portion at the tip of the curl portion is 0.1.
By making the range of about 0.4 mm, the downward angle of the straight portion at the tip of the curled portion with respect to the horizontal can be reduced to 0 ° to 25 ° as compared with the conventional case, and the tip of the curled portion can be Eliminates collision with the side wall of the torso.

Further, in the second invention, the pressing step reduces the radius of curvature of the seaming panel radius portion of the can lid, increases the radius of curvature of the seaming panel portion as described above, and The distance between the ring center and the chuck panel center is also increased so that a can lid shape that forms a suitable continuous joint with the can body flange can be formed during double tightening with the can body. Also,
In the curling process, the penetration angle of the curling groove is increased to 13 ° to 17 ° as compared with the related art, and the angle of the side extruded after curling is reduced to 13 ° to 17 °. By curling with a curling groove having a shape of 26 ° to 34 °, the pressing process has a tip straight portion shorter than before, and the curl portion having a large radius of curvature is formed without breaking the curl portion. To allow the seaming panel portion of the can lid to form a can lid shape that is preferably joined to the flange portion of the can body during double-tightening, thereby enabling the horizontal portion of the straight portion at the tip of the curl portion to be formed. Can be reduced to 0 ° to 25 ° as compared with the related art.

(Example) Hereinafter, an example of the method according to the present invention will be described in detail.

Pressing the aluminum can lid material, the shoulder angle {2} is 13 ° as shown in the first illustration, the radius of curvature R2 of the seaming panel radius part 2 is 1.8mm, the radius of curvature Q2 of the seaming panel part 3 is 4.8mm, Further, the press die center 9 in the seaming panel section 3 is the chuck panel center 8.
And the radius of curvature P2 of the curl portion 4 is 1.2 mm
mm, and the length L2 of the straight portion 5 at the tip of the curl portion 4 is set to 0.
A can lid 1 having a size of 3 mm was formed.

Thereafter, the coal part 4 was curled by using curling grooves which formed an angle of 14 ° on both sides from the horizontal center line as shown in FIG.

As a result, the radius of curvature P2 of the curl portion 4 is larger than before, the press-die ring center 9 is closer to the curl portion 4 side than before, and the tip straight line 5 of the curl portion 4 is shorter than before. Therefore, the curled portion 4 can be formed along the curling groove as shown in FIG. 2b, and the straight portion 5 at the tip of the curled portion 4 forms an angle of about 20 °, which is smaller than the horizontal direction, below the horizontal. A can lid 1 having such a shape was formed.

In FIG. 3, reference numeral 6a denotes a flange portion 6a of an aluminum can body 6 which is wound together with the can lid 1.

Next, the results of studies on the length and angle of each part of the can lid 1 when the can lid 1 and the flange portion 6a of the can body 6 are double-tightened will be described in detail.

First, if the shoulder angle Θ2 shown in FIG. 3 is 10 ° or less, the diameter of the chuck wall portion of the can lid 1 becomes too small with respect to the inner diameter of the can body 6, and the fitting between the can body 6 and the can lid 1 is poor. Therefore, it was found that wrinkles and stepped portions were formed at the respective joints.

If the shoulder angle {2} is set to 15 [deg.] Or more, a gap is formed between the can lid 1 and the flange portion 6a of the can body 6, and as pointed out as the conventional problem, the flange portion 6a Abuts against the surface of the can lid 1 and is wound while shaving the seaming grabber applied to the surface.
Length cannot be obtained sufficiently.

The radius of curvature R2 of the radial portion 2 of the seaming panel is
When the thickness is 1.7 mm or less, the flange 6a of the can body 6 does not enter the inner surface of the curled portion 4 of the can lid 1, and when the thickness is 2.0 mm or more, a gap is generated between the can lid 1 and the flange 6a. As described above, since the tip of the flange portion 6a abuts on the surface of the can lid 1, the radius of curvature R2 of the seaming panel radius portion 2 is set to 1.7 to 2.0 mm.

Further, as a result of examining the radius of curvature Q2 of the seaming panel portion 3, when the radius of curvature Q2 is in the range of 4.5 to 5.3, the shoulder angle Θ2 and the radius of curvature R2 of the seaming panel radius portion 2 are within the above preferred ranges. In this case, it was found that the flange portion 6a of the can lid 1 and the can body 6 formed a continuous joint portion suitable for double winding as shown in FIG.

If the length L2 of the straight portion 5 at the tip of the curl portion 4 is set to 0.1 mm or less, it becomes difficult to insert the straight portion 5 with a tool in press working, so that the product size of the can lid 1 is reduced. Variations occur and deformation or wrinkling of the portion 5 occurs due to insufficient pinching by the tool during processing.

Further, the length L2 of the straight portion 5 at the tip of the curl portion 4 is set to 0.4 m.
If the length is not less than m, the tip of the linear portion 5 will abut against the side wall of the can body 6 during the tightening, which causes inconvenience such as damaging the side wall of the can body 6.

Therefore, the length L2 is preferably set in the range of 0.1 to 0.4 mm.

Further, it has been found that if the straight portion 5 at the tip of the curl portion 4 is set to a horizontal angle of 25 ° or more, there is a possibility that the difference between the double tightening and the straight portion 5 may hit the side wall of the can body 2 as described above.

Moreover, since it becomes difficult to double-tighten the straight portion 5 along the side wall of the can body 2 to the portion above the horizontal,
The tip 5 is preferably at an angle of 0 ° to 25 ° from the horizontal. In addition, after forming the front end portion 5 in the range of Q2, R2, Q2, L2 within a predetermined value range, in order to set the angle range of 0 ° to 25 °, the angle of the curling groove on the entry side is set to 13 °.゜ ~
It has been found that it is preferable to set the angle on the side extruded by 17 ° to the curl portion in the range of 13 ° to 17 °, and more preferably in the range of 26 ° to 34 °.

As described above, as a result of setting Θ2, R2, Q2 and L2, it was found that the radius of curvature P2 of the curled portion 4 should be set in the range of 1.1 to 1.3 mm.

Further, in order to set such a setting, as a result of the experiment, the die ring center 9 was moved from the chuck panel center 8 by 4.6 to
It turned out that it should be within the range of 5.0mm.

That is, if the distance of the die ring center 9 from the chuck panel center 8 is set to 4.6 mm or less, the radius of curvature R2 of the seaming panel radius portion 2 becomes smaller than the set range, and accordingly, the can lid 1 A gap is generated between the wire and the flange portion 6a of the can body 6 at the time of tightening.

Further, when the distance is 5.0 mm or more, the value of R2 is larger than the set range, and it is difficult to set the length L2 of the straight portion 5 at the tip of the curl portion 4 to the set range. turn into.

Therefore, if the above-described respective portions of the can lid 1 shown in the third embodiment formed in the above-described embodiment are set to the setting ranges obtained by the above-described examination results, the can lid 1 has a smaller shape than the conventional one as shown in FIG. It is possible to form the can lid 1 that can be double-fastened with the flange portion 6a of the can body 6 satisfactorily and reliably.

(Effects) As a result, according to the first clarification, when the can lid and the can body are double-wound with the length of the lid leg shorter than before, between the can lid and the can body flange portion, A joint portion having a predetermined length is formed on the can body, and the tip of the can body flange can be prevented from abutting against the surface of the can lid. It is possible to reduce as compared with the related art, and it is possible to prevent the tip of the curled portion from abutting on the side wall of the can body.

According to the second aspect of the present invention, in the press working step, the radius of curvature of the seaming panel radius portion of the can lid is reduced, the radius of curvature of the seaming panel portion is increased, and the press die The distance of the center to the center of the chuck panel is also increased, and when double-tightening with the can body, the can lid shape that forms a suitable joint with the can body flange can be formed. The curving groove having a larger penetration angle than the conventional one and a small angle on the side to be extruded after curling has a direct end portion that is shorter than the conventional one by the press working step, and has a curvature. The curled part with a large radius can be penetrated into the groove without breaking, and the seaming of the can lid during double winding The flannel part can form a can lid shape that is suitably joined to the flange part of the can body, the downward angle of the straight part at the tip of the curl part with respect to the horizontal can be made smaller than before, and the double winding can be performed. In this case, it is possible to prevent the tip of the curled portion from abutting on the side wall of the can body.

Therefore, according to the present invention, even if the length of the lid leg of the can lid is shortened as compared with the related art, it is possible to perform good and reliable double-tightening with the can body flange portion, and furthermore, a smaller-sized winding than the conventional one. It is possible to provide a can lid capable of forming a portion and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing a shape of an embodiment of a can lid according to the present invention, FIGS. 2a and 2b are partial sectional views of a curling groove for curling a curled portion of the can lid shown in FIG. FIG. 3 is a partial cross-sectional view for explaining the joining state of the can lid and the can body shown in FIG. 1 at the time of tightening, FIG. 4 is a partial cross-sectional view of a conventional double-tightened portion, and FIGS. FIG. 8 is a partial cross-sectional view for explaining a conventional product, FIG. 9 is a partial cross-sectional view for explaining a conventional double-tightened portion in the present invention and the present invention,
Fig. 10 to Fig. 11 are partial cross-sectional views for explaining a conventional product. 1 ... can lid 2 ... seaming panel radius section 3 ... seaming panel section 4 ... curl section 5 ... straight line at the tip of curl section Part 7: Shoulder part 8: Chuck panel center 9: Press die ring center… 2: Shoulder angle

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor, etc. Saito et al. 839-1 Shikamuro, Iwatsuki-shi, Saitama Pref. JP-A-61-152550 (JP, A)

Claims (2)

(57) [Claims] A shoulder portion having a shoulder angle in a range of 10 ° to 15 ° with respect to a chuck panel center;
A seam panel having a radius of 1.7 to 2.0 mm, a seaming panel having a radius of curvature of 4.5 to 5.3 mm, and a curl having a radius of curvature of 1.1 to 1.3 mm. A straight can lid for double winding, characterized in that the straight part at the tip forms an angle in the range of 0 to 25 ° downward with respect to the horizontal and the length is in the range of 0.1 to 0.4 mm. 2. The radius of curvature of the seaming panel radius is 1.
Formed in the range of 7 to 2.0 mm, formed the seaming panel part with a radius of curvature of 4.5 to 5.3 mm, and set the press die center in the seaming panel part in the range of 4.6 to 5.0 mm from the chuck panel center. And the cursor
A pressing step of forming the straight portion at the tip of the curl portion in a range of 0.1 to 0.4 mm, and forming the curl portion on both sides from the center line on the both sides from the center line.
A curling process step of curling using a curling groove having an angle in the range of ゜ to 17 ° and an angle in the range of 26 to 34 ° in total. Manufacturing method