JPS62146148A - Can drum for three piece can - 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 Field of the Invention The present invention relates to a three-piece can body, and more particularly to a bonded can body in which a single blank is cylindrically molded and joined together with an adhesive.

BACKGROUND OF THE INVENTION Conventionally, adhesive can bodies have been produced by forming a blank 10 into a cylinder with the four corners slightly notched diagonally as shown in FIG. 13.13'
It is bonded by polymerization.

Therefore, the polymerized adhesive part is two sheets thick, and when the can lid is tightened, that part becomes two sheets thicker than the pond part and swells, as shown in Figure 10.11. This creates a step between the pond and the pond.

Problems to be Solved by the Invention The polymerized adhesive parts near the upper and lower opening ends of the fake can body are expanded by flanging, contracted by neck-in processing, and further bent and stepped by seaming. The bond was sometimes destroyed due to excessive compressive load. Furthermore, in the seaming of the can lid, due to the step caused by the superposition bond, the seaming of the normal seaming portion near the step was loose, as shown in FIG. 11(a). Therefore, if there is less compound compressed in this area, there is a problem in that the polymerized adhesive part breaks down and a leak path is created, resulting in a decrease in sealing.

The present invention has been devised in view of the above-mentioned circumstances, and provides a bonded can that can prevent the adhesion of the can body from being destroyed at the seam part and improve the sealing ability of the seam part. The purpose is to provide a torso.

Means to solve the wall point If there are few or no steps at the joints, such as with welt-resistant cans or draw cans, the above-mentioned leakage phenomenon at the seamed part is almost non-existent. . Therefore, for oaks with fewer steps at the joint, the tightening load applied to the bonded portion is reduced and breakage is prevented, and looseness in the normally seamed portions near the steps is reduced, improving sealing performance. The present invention has been made with attention to this point.

The structure of the present invention for solving the above-mentioned interhearing point will be explained with reference to the drawings corresponding to embodiments.

The present invention provides a three-piece can package in which one blank 1 is cylindrically molded and joined together with an adhesive tape. ■ By providing a roughly square notch 2 and a ridge at the corner, the joint 111g is made at a 16° angle to the seaming part.
? All of the above problems were solved by making the width of the joint of the candy at least approximately 1/2 or less.

In addition, when the joint width f of the joint part located in the tightening part is zero, that is, the joint part is joined by butting the edges of the notches 2.2' with an adsorbent, the width of the joint part is as normal. The thickness is the same as that of , and the difference in level can be eliminated.

By providing substantially angular notches at the four corners of the working blank 1, when molded into a can body, the joint width at the location where the notches are provided will be smaller than at the pool joint. If the width of the notch is approximately 1/2 of the width of the joint other than the seaming part, the edges of the notch will be butt-joined with adhesive tape at the joint, and there will be a difference in level with the f-width part caused by the joining. is resolved.

When a lid is wrapped around a can body constructed in this way using a well-known method, the joint located at the end of the roll has a much narrower joint width than conventional ones due to the above-mentioned notch, so there is little difference in level. As a result, the seaming load is reduced, the seaming becomes easier, and the joint at the seaming portion can be prevented from being destroyed.

EXAMPLES Hereinafter, examples of the present invention will be described in detail based on FIGS. 1 to 6.

FIG. 1 is a front view of a blank 1 for forming a can body of a three-piece can according to the present invention. The core blank 1 has four corners r (notches 2.2
' is formed. Therefore, the notch 2.2' has a size that can eliminate or make the overlapping adhesive part in the seaming part extremely small, that is, the height a is the seaming width W (after seaming the can lid). (See FIG. 4), and is cut into a substantially square shape with a width of about 1/2 of the width C of the overlapping bonding portion. In the embodiment shown in FIG. 2, the height a of the notch 2 provided on the side edge 3 located on the outside of the can at the joint when formed into the can body is greater than the height a of the notch 2 provided on the side edge 3 located on the inside of the can. The notch 2' is slightly deeper than the height a of the notch 2', and the width is slightly steeper than the width C of the overlap bonding part 14 so that the edges can be joined to each other via adhesive when the can body is formed. It's a big deal. In the embodiment shown in FIG. 6, the width of the notch is slightly smaller than the width C of the overlapping bonding portion so that the edges of the notch overlap slightly as shown.

A nylon adhesive tape 4.4' is applied to the side edge 3.3' of the blank 1, in which the cutout 2.2' has been formed as described above. At that time, the adhesive is applied to only one side of the side edge 3 located on the outer side of the can at the adhesive overlapping part, but it is applied to both the front and back sides of the side edge on 911 &3' located on the inner side of the can. Paste on.

Next, the whole blank 1 is pasted with adhesive tape 4.4',
Form into a cylindrical shape using a well-known method and tape both ends with adhesive tape 4.4
By adhering through the can body, the desired can body can be obtained.

The can body formed in this way has both side edges 3 and 3' bonded by polymerization, but the bonded portions at the locations corresponding to the 4'τ seaming position at both ends of the opening are shown in Fig. 2 and 3'. As shown in Figure 3, because of the notch 2.2, the ends of the grooves are joined with adhesive tape 4.4', so the cutout area is thick like the polymer adsorption part of a pond. It won't happen. Note that, as shown in FIG. 3, the joints are sealed by adhering adhesive tapes 4.4 to each other.

When firewood is wrapped around the can body using a well-known method, both jjj! Since the bonded part at the l end is not polymerized as in the conventional case, it is thinner by two board thicknesses than the conventional bonded part at 6, as shown in Figure 4, and is the same as the normal seaming part. @tightening can be performed at various W widths.

91, the stepped part by the eye is I! 4 and can be rolled up with a uniform thickness.

In addition, when it comes to the production of the factory 1 in the field 1, please refer to 1.
．． In the long material 6 as shown in Figs. 7 and 51, parts corresponding to the four corners of the blank are cut off, adhesive tape is applied to the entire length, and then the blanks are cut into individual blanks.

Effects Since the can body of the present invention is purchased as described above, the can body in the seaming part is fixed! ] 1nILJlll The level difference caused by joining the edges is eliminated, and when the seaming roll passes through the edges during the tightening process, it is possible to prevent excessive impact load from being applied to the joint and breaking the bond.

Furthermore, since there is no level difference in the seaming portion, the seaming can be done evenly and tightly, and unlike the conventional method, there will be no incompletely tightened areas. Therefore, it is possible to prevent the hermetic failure of the seamed joint, which was a problem with conventional adhesives, and it is superior to completely sealed adhesives, as shown above. The present invention has various effects.

[Brief explanation of drawings]

1 to 5 show examples of the present invention, in which FIG. 1 is a top view of a blank, FIG. 2 is a partial side view of a can body joint, and FIG. 3 is a view of A in FIG. Figure 4 shows the a-a cross-sectional view of Figure 2 when the can body shown in Figure 2 is sealed and the 4)-b-b cross-sectional view. A top view of the long material in the process, FIG. 6 is a top view of the can body joint of the embodiment of the pond of the present invention, FIGS. 7 to 11 show the conventional example, and FIG. 7 is a blank Figure 8 is a partial side view of the can body joint, Figure 9 is @8 (Figure A-A sectional view,
FIG. 10 is a schematic view of the seaming part of the joint, and W111MI is the a-a cross-sectional view and the b-b cross-sectional view of the 10th t:QI. 1 Blank 2.2': Notch 3.3': 1Ll
ll Green 4.4': Adhesive tape 6: Long material patent applicant Toyo Seikan Ishikikaishi applicant's agent Patent attorney Fumi Sahi (and 2 others)
Name) Military 1 Figure ≠ 2 Figure (b) (a) 稟 4 N1 Figure 6 #L 7 Figure? -8 Nu1 T l fl S (b) $ 11 Figure

Claims (1)

[Scope of Claims] 1) In the can body of a three-piece can, which is formed by cylindrical molding a single blank and joined together with an adhesive, approximately square notches are provided at the four corners of the blank to prevent winding. A can body for a three-piece can, characterized in that the joint width of a joint located at a tightening part is at least approximately 1/2 or less of the joint width of other joints. 2) the joint width of the joint located at the seaming part is zero;
2. The can body of a three-piece can according to claim 1, wherein the joint portion is formed by butt-joining the edges of the notch with an adhesive.