JPS6311216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a pull tab for an easy-open can, and more particularly to a method for manufacturing the pull tab.

[Prior Art] Today, in can containers filled with various contents such as canned beer and canned cola, a pull tab 20 is attached to a can lid 10 with a rivet 11 as shown in FIG. Many containers are used in which the opening 12 surrounded by the cut line 13 is opened by lifting the container 20.

As shown in FIG. 2, the order of manufacturing this pull tab 20 is as shown in FIG. Figure A), the tab material 21 is not cut and separated from the coil 15 individually, but is fixed to the strip coil 15 at the connecting portion 22, and then the rivet hole 23 is fixed.
The tab material is then molded into an uneven shape as appropriate, and the necessary tab forming processes are performed, such as providing a peripheral curl 24 (FIG. 2B). After that, the connecting portion 22 is cut at the end of the tab material 21. and completed the pull tab 20.

When manufacturing the pull tab 20, if the connecting portion 22 is provided along the center edge of the strip coil 15, as shown in FIGS. 2 and 3, the pull tab 20
, the connecting portion 22 is centered around the rivet hole 23.
Since the processed material portion 27 on the opposite side is bent and requires complicated processing to add necessary strength, the connecting portion 22 is naturally provided on the lifting portion 30 side of the pull tab 20.

Note that when manufacturing the pull tab 20, as shown in FIG. By providing the curls on the left and right sides (in the vertical direction in FIG. 2), curls may also be provided in the central portion of the lifting portion 30.

[Problems to be Solved by the Invention] As described above, the pull tab 20 manufactured by forming a connecting part at the center of the periphery is processed by providing the connecting part 22 on the upper end side of the lifting part 30. Since the connecting portion 22 has a narrow width and a short length, it is difficult to post-process the connecting portion 22 protruding from the pull tab 20 after cutting it from the strip coil 15. For this reason, as shown in FIG.
Although the cut end is cut so as not to leave any traces of the connecting part 22 on the pull tab 20, the cut end does not come into contact with the fingertip as much as possible when the finger is placed on the pull tab 20. The peripheral curl 24 becomes discontinuous at the cut end 28 position,
When opening the can container, the discontinuous portion comes into contact with the fingertip,
Not only did it cause discomfort, but it also had the disadvantage of sometimes stinging the fingertips.

Therefore, when the connecting portion 22 is provided on the upper end side of the lifting portion 30 of the pull tab 20, the width of the connecting portion 22 may be made narrower, or the cut end portion 2 of the connecting portion may be cut as shown in FIG.
In addition, as shown in the side view of FIG. 5, the peripheral curl 24 is crushed on both sides of the cut end 28, so that discontinuous portions of the peripheral curl are formed. I tried my best to prevent it from coming into contact with my fingers, but it still wasn't enough.
Moreover, the connecting portion 2 between the strip coil 15 and the tab material 21
2 on the left and right sides of the pull tab 20, the discontinuous portion is prevented from coming into contact with the finger when the finger is placed on the lifting portion 30 as described above, but the width of the coil 15 is determined by the tab material. 2 in width of 21
The width is the sum of the lengths of the connecting parts 22.
This method had the disadvantage of requiring a wide band-shaped coil, resulting in a large amount of wasted material.

[Means for solving the problem] The pull tab manufacturing method according to the present invention provides a connecting portion 22 between the tab material 21 and the strip coil 15 along the center line of the strip coil 15, and an annular shape other than the connecting portion 22. The outer shape of the tab material 21 is punched out from the belt-shaped coil 15 using the cut wire 16, and the tab material 21 is
The tab material 21 is recessed without being separated from the strip coil 15 to form the connecting portion 22 in an S-shape. is cut, and then the end 28 of the connecting portion 22 is curled.

[Function] After making the connecting portion 22 into an S-shape by recessing the tab material 21 further than the coil material 15 in this way, the connecting portion 22 is cut at the end on the band-shaped coil 15 side, and the remaining part of the tab material 21 is cut. Since the connecting portion 22 is curled, the cut end 28 of the connecting portion 22 is S-shaped.
The connecting portion 22 can be curled simply by bending the vicinity inward, and the short and small connecting portions 22 that have been cut can be easily curled.

[Example] As shown in FIG. 2A, the method for manufacturing the pull tab 20 according to the present invention is as follows: First, as shown in FIG. The outer shape of the material 21 is formed, the rivet holes 23 are drilled, the required peripheral curls 24 are bent, etc., the recesses 26 for reinforcing the tab are formed as shown in FIG. 10, and the tab material 21 is shaped into a band. The connecting portion 22 is recessed further than the coil 15.
is horizontally S-shaped. Then, as shown in FIG. 6, the connecting portion 22 is cut at the end on the strip coil 15 side, and
As shown in the back view of the figure and the sectional view of FIG. 8, the connecting portion 22 is curled so that the cut end portion 28 is positioned inward. That is, in the pull tab 20 used for a pull-open type easy-open can, the connecting portion 22 that connects the tab material 21 and the strip coil 15 when performing the tab processing is also curled in the same manner as the peripheral edge of the tab. do.

In this way, by cutting the connecting portion 22 at the end opposite to the tab material and forming the connecting portion 22 into a horizontal S-shape, the cut end 28 of the connecting portion 22 can be easily curled. It becomes possible to curl the short connecting portions 22 of the mass-produced pull tabs 20, and since the cut ends of the connecting portions 22 are curled in this way, the cut ends are curled together with the tab peripheral curl 24. Since the part 28 does not come into contact with the finger, there is no risk of puncturing the finger when opening, and there is no need to provide the bulging part 25 on the peripheral curl 24 as shown in FIG. Since the outer shape can be simplified as shown in FIG. 9, it is possible to create a shape that allows easier peripheral curling, etc., thereby increasing the productivity of the pull tab.

[Effect of the invention] As described above, the pull tab manufacturing method according to the present invention involves recessing the tab material more than the coil material to form the connecting portion into an S-shape, and then cutting and curling the material. The connecting part can be curled to prevent the fingers from coming into contact with the cut end when opening the can, eliminating the risk of causing discomfort or stinging the fingers. This is a manufacturing method that can be provided along the center line of the strip coil, allowing the use of materials without waste.Furthermore, the pull tab manufactured by this method is such that when the can container is opened, the pull tab does not touch the cut end. There is no need to provide a bulge in the peripheral curl at both ends of the connecting part, and it is molded as a pull tab with a relatively simple external shape. This is a method of manufacturing a pull tab that makes it possible to form a pull tab even more easily.

[Brief explanation of the drawing]

Figure 1 is a plan view of a can lid with a pull tab, Figure 2 is a diagram showing the processing of a conventional pull tab, Figure 3 is a vertical sectional view of the pull tab, and Figures 4 and 5 are the main parts of the pull tab. 6th in plan view and side view
Figure 7 shows the main part of the pull tab cut from the strip coil in the manufacturing method according to the present invention.
The figure is a back view of a pull tab manufactured according to the present invention;
FIG. 8 is a vertical cross-sectional view of the main part of the pull tab manufactured according to the present invention, FIG. 9 is a plan view of the pull tab manufactured according to the present invention, and FIG. 10 is a diagram showing the connection portion cut away. 10=can lid, 11=rivet, 12=opening,
13 = Cut line, 15 = Strip coil, 16 = Cut wire, 20 = Pull tab, 21 = Tab material, 22 = Connecting part, 23 = Rivet hole, 24 = Peripheral curl, 2
5=bulging part, 26=concave part, 27=rivet hole side end part, 28=cut end part, 30=lifting part.

Claims (1)

[Claims] 1. A connecting portion between the tab material and the strip coil is provided along the center line of the strip coil, the outer shape of the tab material is punched out from the strip coil using a circular cut wire excluding the connecting portion, and the tab material is cut and separated from the strip coil. In a method of manufacturing a pull tab in which required tab forming processes such as drilling holes for rivets and curling around the circumference are performed without cutting, the tab material is recessed together with the tab forming process, thereby forming the connecting part into an S-shape. After forming the connecting portion, the end portion on the band-shaped coil side is cut,
A method for producing a pull tab for an easy-to-open container, characterized in that the end of the connecting portion is then curled.