One of the good double-rolled cornerstones

One of the good double-rolled cornerstones

——Analysis of the main technical requirements of a rolling circle shape and the important mold foundation for obtaining a good rolling pattern

Wen/Yu Yong, Senior Customer Technical Service Manager, Boer Asia Pacific Ltd.

The miniature double-wrap seal of a two-piece beverage can is divided into a first rewind seal (commonly referred to as "one roll") and a second rewind seal (commonly referred to as "two roll"). After the first roll is completed, the curling of the cover and the flange of the can begin to snap together. As an important basis for double-sealing, a rolling result (especially a graphic) plays a crucial role in the formation and stability of the final winding result.

First, the main technical requirements of a good roll graphic

A good first roll seal has no abnormality in appearance inspection, and the contours of the cover hook and the can hook are smooth and smooth. The cross-sectional shape of the cover hook needs to satisfy the following "15-character 诀", that is, "the contact does not touch, the end of the can hook, Cover the end of the hook".

1, contact does not touch

The rounded cover of the cover is in contact with the rounded corner of the can; the first formed cover hook and the can hook are closely attached to the surrounding metal, and there is a certain gap.

2, the end of the can hook

There is no sudden inflection or turning at the end of the can hook.

3, the end of the cover hook

The tail of the cover hook is as parallel as possible to the wall of the can, the end of the cover hook is not directed toward the can, and there is no excessive roll to the flange of the can.

In short, the direction of the tail of the cover hook and the orientation of the end are very important, which is an important factor affecting the final cover hook result and the final seal result.

Figure 1 Normal roll graph cross-sectional structure

Figure 2 The orientation of the tail of the cover hook and the orientation of the end are an important factor influencing the final cover hook result and the final seal result. (The tail and tail of the cover hook in the figure are in line with the requirements)

Second, several types of bad cover hook tail trend and end point

As shown in Figure 3, the tail of the cover hook has begun to have a tendency to over-bend, and the end of the hook is not too compliant. However, due to the small angle of the end of the hook to the can hook, the flow of the metal at the end of the hook has a chance of "following the trend" when the two rolls are rolled, and the effect on the final sealing result should not be too large, so Can barely accept.

Figure 3 can still barely accept the tail of the cover hook and the end point

In a roll pattern as shown in FIG. 4, since the tail of the cover hook is excessively bent, the end of the can is embedded too deep, and the insertion angle is too large. After the roll is pressed, the cover hook is prone to insufficient size and end cracks. It is prone to extrusion marks (Fig. 5) and even metal cracking, which is a category to be improved.

Figure 4: The tail of the cover hook is excessively bent, the end is embedded in the can hook too deep, and the embedding angle is too large, which needs to be improved.

Figure 5 After the completion of the rolling, the end of the over-curved cover hook of the tail is excessively embedded in the canned cuff (can hook), and after the subsequent two-rolling extrusion, an obvious trace is formed on the can hook.

Figure 6 shows the result of a roll pattern in which the tail end of the cover hook and the end point do not meet the requirements. There are two reasons for this: on the one hand, from the improper roll seal setting, on the other hand, not on the other side with a roll groove and a cover hook. The right match doesn't matter.

Figure 6: The result of a roll pattern in which the tail end of the cover hook and the end point do not meet the requirements.

A normal match between a rolling groove and a hook hook is one of the prerequisites for obtaining a good cover hook. A normal match between the roll groove and the hook edge is an important condition to ensure a good cover hook. The improper matching of the hook hook edge with a roll groove is one of the main reasons for the abnormality of the roll pattern cover hook. Figure 7 shows a visual comparison of the improper matching and normal matching of a rolling groove with an easy-opening hook.

Figure 7 shows a visual comparison of the improper matching and normal matching of a rolling groove and an easy-opening hook.

Third, the summary of the strategy

Choose the best roll groove, such as the Angelus R77 or an equivalent roll groove. The actual combat experience tells us more than once that the Angelus R77 or equivalent roll groove is the easiest to get a standard roll pattern and works best. Other kinds of grooves, including the groove type of Angelus H90 and R94, are not well matched with the 202 easy-opening hooks currently used in China's domestic and even larger regional markets. It is easy to cause hooks and cans in the cover during use. There are various problems.

Because of the importance of the roll, equipment, such as the famous crimping machine equipment suppliers such as Angelus, Ferrum, CFT, etc., have added a special design that can open the two-roller track on the roll-sealing machine equipment they manufacture, so as to be convenient when needed. Roll samples for evaluation.

It is also because of the importance of the roll, Boer Asia-Pacific has put the scrolling graphics requirements and roller groove recommendations into the revised version of the seal standard and training materials, hoping to help our customers to enhance this one is very important The link is more comprehensive and aware.

Proficiency in effective roll-up machine working system adjustment methods. However, even if the scroll wheel groove is good, if it is not properly adjusted, the same bad pattern as mentioned above will also appear. Better hardware conditions do not mean that there will be no problems at all. It also needs to use an effective shrinking machine working system adjustment method. For example, Boer Asia Pacific Co., Ltd. summarizes the implementation of "Shenma 13" for customers. System, specification and practical method of adjusting the working system of the winder.

[Declaration] Article Source: Canned Words 2017 Collection.

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