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Description

one

The invention relates to packaging equipment and relates to rigid packaging, and more specifically to the implementation of longitudinal seams of the body.

A body of a rigid container is known, having a longitudinal lock-overlap seam, the locking part of which is formed by interlocking hooks.

Sealing pastes, sealants, adhesives, etc. are used to seal the seam.

However, cases of a rigid packaging made with such seals, in particular cans, become leaking after some time, as a result of unevenness of the seam at the points of transition from the multi-layer locking part to the two-layered overlapping sections.

The purpose of the invention is to improve the quality of the container by increasing the tightness of the seam.

This is achieved by the fact that at least the inner curved part of one of the hooks is extended to an overlap portion for a distance, preferably equal to half the length of this portion.

In addition, the width of the folded portion of the hook, which is extended to the lap, is preferably half the width of the entire folded portion of the hook.

FIG. 1 shows the container body with a longitudinal seam, general view; in fig. 2 - part

longitudinal schva with a four-layer locking part and an elongated inner hook, general view; in fig. 3 - the same, with an inner hook extended to the end of the case; in fig. 4 - part of the longitudinal seam with a four-layer locking part and two elongated hooks, general view.

The body / container (in particular, cans) is formed from a flat billet by shaping it into a tubular form and joining opposite edges using a longitudinal seam 2.

The longitudinal seam consists of the locking part 3 and the overlapped sections 4 (the drawings show only the part of the seam adjacent to one of the overlapping sections).

The zamkova part is formed by the intermeshing of the outer 5 and inner 6 hooks, forming a four-layer seam. At the transition point of the locking part to the overlap section 4, a part of the hook 5 is cut off along line 7, and a part of the inner hook 6 is turned upward for a distance greater than one third of the length of the overlap portion, and ends with a cut along the line 8. As a result, the transition from the lock part to The overlap, i.e., from four layers to two, occurs gradually on lines 7 and 5. The channel along the edge along line 7 turns out to be covered by a bend 9 of the outer hook.

The other channel along the edge along line 8, at the point of transition from the three-layer section to the double-layer, is outside the inner cavity of the can, as it enters the transverse (seamed) seam, where it is additionally compacted with paste applied inside the end and rolls together with the end.

Although it is more preferable to continue to the overlap area of the folds of the inner hook (in this case it closes the transverse channel on the inside), the tightness will be maintained when the other hook lengthens. In this case, the channel will be blocked by a hook on the outside of the case.

Reliable tightness of the seam is obtained by lengthening one of the hooks in each direction by a distance greater than one third of the length of the overlapping sections (the optimal length itself is somewhere around half of their length).

However, better results can be achieved if this hook continues to the end of the body, i.e., the entire length of the seam (see Fig. 3). In this case, the channel on line 8 - potential leakage - disappears completely, and the channel on line 7 is securely blocked by a hook. However, increasing the thickness of the overlapping sections in such a seam up to three layers makes it somewhat difficult to attach the ends to the body using the seaming method, causing increased shock loads on the seaming tool during seaming.

On the overlapped areas of the seam both bent parts of both hooks 5 and 6 can be continued (see Fig. 4).

Then, at the junction point, the hook 5 is carved along line 7, and

the hook 6 along line 8 is slightly higher than the line 7. Only part 9 extends from the hook 5 to the overlap, and from the hook to the hook 5. 6 - only the W part. The width of the part 8, as well as the part 10, projecting on the overlap

12

plot must be between - to Oo

magnitudes (width). of the glossy region (width of the entire bent part of the hook).

The height of the protruding parts should preferably be half the length of the overlapped portion, but at the same time, the protrusions 8 and 10 can be extended to the end of the container body.

In the same way, a gradual transition from the castle part to overlapping areas can be made when the lock is made of six layers, for example, when a longitudinal seam is formed in large tanks:

cans, tanks or drums.

Subject invention

Claims (2)

1. A body of a rigid container having a longitudinal locking overlap seam, the locking part of which is formed by interlocking hooks, characterized in that, in order to improve the quality of the container by increasing the tightness of the seam, at least the inner curved part of one of the hooks is moved to the lap over the distance predominantly equal to half the length of this section. 2. The body according to claim 1, characterized in that the width of the folded portion of the hook, which is extended to the lap, is preferably half the width of the entire folded portion of the hook. Rig; 3 B 5