JPS5841632A - Method for fastening edge member to can drum - Google Patents

Abstract

PURPOSE:To execute titled fastening by securing perfect airtightness, by pressing a junction part formed by making an edge member adhering to the opening edge part of a can drum, between a pair of grooved rolls, and forming a bent part along the junction part. CONSTITUTION:In a state that an internal grooved roll 10 and an external grooved roll 11 are separated from each other, a rotary board is made to ascend, a junction part 5 is positioned between the rolls 10, 11, and the board 20 is stopped. Subsequently, when rotation of the board 20 is started, a driving shaft 14 turns immediately, moves sector gears 12, 13, and presses the junction part 5 between a groove 10a of the roll 10 and a corresponding projecting part 11b of the roll 11 along its circumferential direction. In this way, a junction part 5' having a bent part 5'a having a wedge-like section and extending in the circumferential direction is formed. In the bent part 5'a, a pin-hole of an adhesive agent layer is pressed and vanishes, therefore, perfect airtightness is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing an end member to a can body, and more particularly to a method for airtightly fixing an end member (lid or bottom) to an open end of a can body by adhesive.

Conventionally, as shown in FIG. 1(L) or (b), an end member 2 or 3 is adhered to an open end 1a of a can body 1 to form a joint 4 (FIG. 1(a)) or 5 (Figure 1(b)
) and fixing the end member to the can body 1 has been proposed. In other words, in the case of FIG. 1(a), the end member 2 has a bottom portion 2a and an inner wall 2b rising vertically from the peripheral edge of the bottom portion 2a.
The outer diameter of the inner wall 2b is slightly smaller than the inner diameter of the open end 1a. The inner wall 2b and the opening end 1a are connected via an adhesive layer 6 (made of a heat-fusible adhesive such as a thermoplastic, a heat-sensitive adhesive such as a hot-melt adhesive, or a pressure-sensitive adhesive). The bonded portion 4 is formed by bonding the bonded portions together. Also, Figure 1 (b
), the end member 3 has an inner wall 3b rising perpendicularly from the periphery of the bottom 3a, and an outer wall 3d hanging down from the upper end of the inner wall 3b (2) via the bent part 3c, and the inner wall 3b is collapsed. The outer diameter of the opening end 1a is slightly smaller than the inner diameter of the opening end 1a, and the inner diameter of the outer wall 3d is 1'! ! j Mouth end 1
The outer diameter of a is set slightly larger than the outer diameter of a. The inner wall 3b and the outer wall 3d are bonded to each other via a binder layer 7, thereby forming a joint 5.

This kind of bonding is done by pressing both sides of the part that is to become the N-joint between a pair of opposing rolls, or between a chuck and a roll, but this pressure is applied along the entire circumference. This is not necessarily done evenly, and wrinkles may occur, and the can body 1 may be attached to the side joints (not shown).
For example, when the adhesive layer 6 or 7 is formed by an adhesive welding method or a soldering method, since the side joints have a difference of W<,
Pinholes penetrating the inside and outside of the can body tend to occur, resulting in loss of airtightness.

Therefore, when the inside of the can body is filled with contents such as food and sealed with the end member, the contents (especially in the case of liquid) may leak through the pinball, or outside air may enter the inside. This may cause deterioration of the contents (e.g. change in color, destruction of vitamins, etc.), and even if sterilization is performed after sealing, bacteria can easily enter from the outside and cause spoilage of the contents. There is a problem.

Therefore, the joining method of the type shown in Figure 1 can be used when it is difficult to apply the double seaming method, for example, when the can body 1 is made of a thin wall or a material with poor rigidity, and the axial load applied during double seaming (normally Although it has the advantage of being applicable even in cases where it cannot withstand about 120 to 200 kg), it has not been put into practical use.
In particular, it has been difficult to put this into practical use as containers for long-term room temperature storage of foods.

The present invention aims to solve the problems of the prior art described above.

In order to achieve the above object, the present invention provides a method for fixing an end member to an open end of a can body.
After bonding an inner wall rising vertically from the bottom peripheral edge of one end member to form a joint, pressing the joint between a pair of facing rolls having mutually corresponding profiles,
The present invention provides a method for fixing an end member to a can body, the method comprising forming a bent portion along the joint.

Furthermore, the present invention provides a method for fixing an end member to an open end of a can body, in which an inner wall (i) rising perpendicularly from the bottom peripheral edge of the end member is adhered to the inside of the split end; After gluing the outer wall of the end member that hangs down from the upper end of the inner wall through the bent part to the outside of the inner wall to form a joint, between a pair of opposing grooved rolls having mutually corresponding profiles. The present invention provides a method for fixing an end member to a can body, the method comprising pressing the joint to form a bent portion along the joint.

The present invention will be described below with reference to the drawings.

In FIGS. 2 and 3, 1 is a can body, and an end member 3 (of the type shown in FIG. 1B) is attached to the open end 1a of the can body.
In this case, the bottom part) is bonded by a conventional method via an adhesive layer (not shown, the same as the adhesive layer 7 in FIG. 1(b)) to form a joint 5 (5). Therefore, penetrating pinholes (not shown) are often formed in the adhesive layer. The can body 1 is made of metal plates such as tin-plated steel plates (bushiki), tin-free steel plates (electrolytic chromic acid treated steel plates), aluminum alloy plates, plastic sheets, paper materials (impregnated or coated with wax or plastics, etc.) ), or joining opposite edges of a laminate blank made of a suitable combination of plastic sheet or film, paper material, metal foil (adhesion method,
It is formed by welding, soldering, etc.). Alternatively, although not shown, it may be a cup-shaped object formed by drawing or cutting a metal plate (in this case, the end member is only the lid part).
. For the end member 3, a metal plate (including those with a coating film, a printed film, etc. formed on the surface), a plastic sheet, or a laminate of metal foil and plastic film is selected depending on the purpose of use. , and is formed into the shape shown in the figure by press working or the like. Incidentally, when the joint surface between the open end 1a of the can body 1 and the inner wall 3b and/or outer wall 3d of the end member 3 is made of a heat-fusible plastic film, the above-mentioned adhesive layer is not necessarily required. 10
and 11 are an internally grooved roll and an externally grooved roll, respectively, in which grooves 10a and 10b consisting of uneven parts having a wedge-shaped cross section are formed along the circumferential direction. The profiles of both rolls correspond to each other such that the surfaces of the corresponding externally grooved rolls 11 are convex. The vertical shaft 10b of the internally grooved roll 10 is rotatably supported near the circular arc portion of the horizontal fan-shaped gear 12 9, while the vertical shaft 11b of the externally grooved roll 11 is
It is rotatably supported near the periphery of the circular arc portion of the horizontal fan-shaped gear 13. The sector gear 12 and the sector gear 13 are engaged with each other, and when the driving vertical shaft 14 rotatably attached to the sector gear 12 is rotated by a drive mechanism (not shown), the sector gear 13 is rotated about the vertical support shaft 15. is configured to do so. That is, the vertical shafts 10b and llb are eccentrically supported by the sector gears 12 and 13, respectively, and as shown in FIGS. 2 and 4, when the sector gears 12.13 are in the position shown by the solid line, The internal front roll 10 and the external grooved roll 11 are in the position indicated by the dash-dotted line (FIG. 2) and are facing each other such that the horizontal spacing between the profile surfaces of both rolls is at the joint 5 (third The grooved rolls 10 and 11 are arranged so that the thickness is approximately equal to that shown in FIG. Then, when the drive shaft 14 is rotated from the above-mentioned opposing position so that the sector gear 12 comes to the position shown by the two-dot chain line in FIG. The attachment roll 10 and the outer couplet roll 11 are also moved to the positions shown by the two-dot chain line, and the distance between the two rolls is widened as shown in FIG.

Reference numeral 20 denotes a rotary turntable, the convex portion 20a of which has an outer diameter approximately equal to the inner diameter of the lower portion 1b of the can body 1. Reference numeral 21 denotes a pair of semicircular pressing tools whose inner diameter is approximately equal to the outer diameter of the lower part 1b, and which presses the lower part 1b radially inward by a suitable suppressing mechanism 22 (for example, an electromagnetic solenoid) to rotate the can body 1. Reached 1st place on board 20. The rotating plate 20 is rotated via a shaft 23 by a drive mechanism (not shown). When loading and unloading the can body 1, the rotary plate 2o is configured to be able to be lowered.

The can body 1, which has a joint 5 formed between it and the end member 3, is fixed to the rotary disk 20 by a pressing tool 21 while the rotary disk 20 is lowered. And the sector gear 12.13 is the second
In the state shown by the two-dot chain line in the figure, that is, in the state in which the internal couplet roll 10 and the external grooved roll 11 are separated as shown in FIG. The rotation of the rotary disk 20 stops at a point located between the grooved rolls 10 and 11', and preferably at a point where the bent portion C is located above the grooves 10a and 11a. Next, the turntable 20
starts rotating, the drive shaft 14 immediately rotates, the sector gear 12.13 moves to the position shown by the solid line in FIG. roll 10
The joint is pressed between the grooves 10a of the outer grooved roll 11 and the convex portions 11b corresponding to the grooves 10a of the external grooved roll 11, and has a bent portion 5/a extending in the circumferential direction with a draft-shaped cross section as shown in FIG. This becomes part 5'. At the bent portion 5'a, the pinhole in the adhesive layer is pressed and disappears. Before forming the bent part 5/a, the joint part 5 is heated to melt or soften the heat-fusible plastic or heat-sensitive adhesive constituting the adhesive layer,
In this state, the bent portion 5'a is formed as described above, and the adhesive layer is immediately cooled to a temperature lower than the melting point or softening point (by using a cooled grooved roll 10°11 or by blowing cold air, etc.). (c) By doing so, the pinhole can be more reliably eliminated. Note that the depth of the valley in the bent portion 51a is preferably about 0.05 to 2.0 mm.

Then, the drive shaft 14 is rotated in the opposite direction to rotate the grooved roll 10.11.
is returned to its original position, the turntable 20 is lowered, and the can body having the joint 5' is removed.

The present invention is not limited to the above-described embodiments; for example, the can body 1 may be fixed, and the inner grooved roll 10 and the outer grooved roll 11 may be rotated at the same time as they revolve along the joint portion 5. . Further, a bent portion may be formed in the joint portion 4 having the configuration shown in FIG. 1(a) in the same manner as described above.

According to the present invention, since a bent portion is formed at the joint, pinholes penetrating the adhesive layer are compressed and disappear at the bent portion, thereby ensuring complete airtightness. Furthermore, since no axial load is applied during the above-mentioned formation, there is an advantage that it can be applied to can bodies made of relatively thin or less rigid materials.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a main part of an example of a conventional joint formed by fixing an end member to a can body by adhesive, and FIG. 1(a) is a drawing showing the first example. , Figure 1 (
b) is a drawing showing a second example; Figure 2 is a plan view of an example of the apparatus used to carry out the method of the invention; Figure 3 shows the grooved roll in the position indicated by the dash-dot line; FIG. 4 is a vertical cross-sectional view taken along line A-A in FIG. 2 when the grooved roll is in the position indicated by the dashed-dotted line. . DESCRIPTION OF SYMBOLS 1... Can body, 1a... Open end, 2... End member, 2a... Bottom, 2b... Inner wall, 3... End member,
3a...bottom, 3b...inner wall, 3c...bending part,
3d...Outer wall, 4.5...Joint part, 5'a...Bending part, 10...Internally grooved roll, 11...Externally grooved roll.

Claims (1)

[Claims] (1) A method for fixing an end member to an open end of a can body, in which an inner wall rising perpendicularly from the bottom peripheral edge of the end member is adhered to the inside of the open end. After the joint is formed, the joint is pressed between a pair of opposing grooved rolls having mutually corresponding profiles to form a bent part along the joint. How to secure end members to. (2) In a method of fixing an end member to an open end of a can body, an inner wall rising perpendicularly to the bottom peripheral edge of the end member is adhered to the inside of the open end, and , After bonding the outer wall of the end member hanging down from the upper end of the inner wall to form a joint, the joining is performed between a pair of opposing grooved rolls having mutually corresponding profiles. A method for fixing an end member to a can body, the method comprising pressing the end member to form a bend along the joint. (1)