Square can and method and device for double-seaming the same

A double hemming and hemming technology, applied in the directions of packaging, transportation and packaging, other household appliances, etc., can solve the problems of unobtainable hemming size and change, and achieve suppression of wrinkles, high sealing performance, and improved storage. The effect of efficiency

Active Publication Date: 2008-05-07
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the end of one straight line portion near each corner enters inward, and the final bead shape is such that the bead width (T dimension) of each side changes monotonously, and a uniform bead size cannot be obtained.

Method used

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  • Square can and method and device for double-seaming the same
  • Square can and method and device for double-seaming the same
  • Square can and method and device for double-seaming the same

Examples

Experimental program
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Effect test

Embodiment 1

[0092] In the device according to the above-mentioned embodiment, the cam groove of the master cam for primary hemming is formed in a shape similar to the outer circumference of the indenter at a predetermined ratio, and the cam groove of the master cam for secondary hemming is formed as follows , that is, the straight line portion is the same as the master cam for the primary curling, but the corner curling portion is as shown in Figure 8, in the cam groove of the primary curling, the centerline of the corner curling portion deviates to the outside by r= The center locus formed by the arc at the position of 0.5mm. In addition, the groove of the secondary hemming roller is set to α=18° and w=3.4 mm in the shape shown in FIG. 7 . In addition, as the indenter, an indenter having a shape as shown in FIG. 4 was used, and the indenter depth was H=2.55 mm.

[0093] According to the above-mentioned device, the can body (material A3003-H14, plate thickness 0.5mm) formed with a radius...

Embodiment 2

[0098] Using the crimping device shown in FIG. 5 and FIG. 9 , primary crimping was performed on a substantially square lid 3 having the following dimensions to obtain a primary crimped square can.

[0099] The shape of the cover before curling: a slightly square shape with one side being 56mm and corner R=8mm

[0100] The shape of the can after one-time crimping: the upper side is 50mm, the corner R is 5mm, and the thickness of the crimping (T(TC) dimension) is 2mm.

[0101] Each dimension of the double seaming device of this embodiment which seamed the square can mentioned above was set as follows.

[0102] Indenter: a slightly square shape with one side 46mm and corner R3mm reduced by the thickness of the crimping of the can.

[0103] The pressing head is arranged at the center of the rotating plate of the curling head.

[0104] Profile cam for primary crimping: a cam with a width of 46mm formed as a roughly square track with a side 120mm drawn from the center of the cam f...

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Abstract

According to the present invention, a square can capable of securing high sealing performance even if the radius of curvature of the seamed part at its seamed corner part is reduced, enabling a reduction in the depth of its counter sink, reduced in size, and having excellent sealability and storage efficiency and a method and a device for double-seaming the square can. A secondary seaming roll (55) is guided by a model cam for secondary seaming having a model cam surface for secondary seaming formed in such a shape that it is swelled from a model cam surface for primary seaming outwards at the corner seamed part (5). Accordingly, the seamed part of the corner caulking part (5) is formed in such a shape that the seamed width thereof at the center of the corner seamed part is larger than the seamed width of the linear sealed part (4) of the can and is swelled outwards to absorb an increase in plate thickness at the corner seamed part. Also, a seaming wall part (6) is formed in a tilted seamed shape so that the overlap of a cover hook (8) with a body hook (10) of a prescribed amount can be secured without allowing the cover hook (8) to fall from the body hook (10) so as to maintain excellent sealability.

Description

technical field [0001] The invention relates to a square can, especially a square can capable of reducing the radius of curvature of a corner curling portion while ensuring high sealing performance, a double curling method and a double curling device thereof. Background technique [0002] The double seaming of square cans has a corner seaming part and a straight part, so unlike the case of round cans, it is difficult to make the seaming by rotating the can. In the state where the can and the lid are held by the disc to fix them, the primary seaming roller and the secondary seaming roller are controlled by the master cam formed with a cam groove similar to the shape of the can so that they move along the circumferential direction of the track. By rotating, crimping is performed (for example, refer to patent document 1). For the crimping of this kind of square can, the straight line part is the bending process of the flange part of the can body and the can lid, and the corner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D8/20B21D51/30
Inventor 大堀圭吉田清隆森下直黑田宽治安田范史安藤和夫加藤久
Owner TOYO SEIKAN KAISHA LTD
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