JPS5841633A - Double seaming method - Google Patents

Abstract

PURPOSE:To form a double wind-clamping part which is excellent in its airtightness without causing deformation even in case of a thin material, by forming a circumferential groove part whose section is a chevron shape, on a spare junction part formed by inserting an opening end part of a can drum into a gap of an end member, and after that, working it to the double wind-clamping part. CONSTITUTION:A spare junction part 28 is formed by inserting an opening end part 26 of a can drum 25 into a gap between an inside wall 22 of a panel part 21 and an outside wall 24 hanging down through a bent part 23. Subsequently, by use of a circumferential groove forming device A, the junction part 28 is pressed between a circumferential surface 31a of a pressure roll and a circumferential groove 41 of a rotary chuck 30, and a circumferential groove part whose section is a chevron shape is formed by spinning working. Subsequently, by use of a device having the same structure as the device A, the circumferential part is further bent. Subsequently, by use of a seaming device, a double wind-clamping part 56 is formed from a circumferential groove part 29'. That is to say, the lower part of the junction part 28 is pressed and supported by a pressure roll 41 and a rotary chuck 57, a tapered part 55' is pressed downward by spinning working until the outside wall of an upper tapered part 55' contacts with the outside surface of a lower tapered part 54', and the wind-clamping part 56 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double seaming method and apparatus, and more particularly to a double seaming method and apparatus in which an extremely small axial load is applied to a can body when forming a double seam part.

In the conventional double seaming method, as shown in FIG. After placing the curled part 4 of the can body 1 (lid or bottom part) and fitting the chuck 6 into the end member 3 having the recessed mother tongue part 5, the lower part of the can body 1 is supported by a lifter (not shown). Figure 1 (b)
As shown in FIG. 2, the curled part 4 and the flange part 2 are pressed between the first seaming roll 7 and the chuck 6, so that the end 4a of the curled part faces upward, and the inside of the flange part 2 faces downward. Form the preliminary seaming part 8 that has entered the area, and then,
By the second seaming roll 9, a portion 4a' corresponding to the curled portion end 4a (usually called a cover hook) and a portion 2' corresponding to the flange portion 2 (usually called a body hook) are attached to a sealing cone (not shown). This is done by forming a double seam portion 10 shown in FIG. 1(C) which is closely spaced through a window. In addition? The bent portion 11 at the upper end of the dehook 2' is usually called a dehook radius.

As described above, in the conventional double seaming method, especially in the step of forming the preliminary seaming part 8, the axial component force applied to the flange part 2 is supported to prevent the flange part 2 from escaping and of? In order to ensure the length of the dehook 2', a fairly large axial load (for example, 120 to 200 kg) must be applied to the can body l by a lifter. If an attempt is made to apply the heavy seaming method, the can body will buckle, making it impossible to obtain a satisfactory product. Therefore, the thickness of the can body is thinner than the specified value (for example, approximately 0.10 mm in the case of tin-plated steel, approximately 0.13++ m in the case of aluminum alloy) due to constraints from the axial load applied during double seaming. (Even if the can body is thinner than the above specified value, for example, in the case of a sealed can whose internal pressure is higher than atmospheric pressure, problems such as deformation due to external use such as impact are unlikely to occur.) Therefore, the wall thickness of the can body should be made thinner. Therefore, it was difficult to reduce costs. For the same reason, it is difficult to apply the conventional double-sealing method to can bodies made of relatively thin plastics, paper, or laminates thereof (including laminates with metal foil). Ta.

Therefore, although the double-sealed part has the advantage of being highly reliable in terms of airtightness, it still has the above-mentioned problems.
However, there was a problem in that it was difficult to form the can body using the conventional double seaming method.

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 double seaming method for forming a 2 (5) type seaming part extending obliquely upward on the inside joining the open end of the can body and the end member, A straight cylindrical open end is inserted into the gap between the inner wall that rises vertically from the upper end of the inner wall and the cover fan end member of the double-sealed part that hangs down from the upper end of the inner wall through the bent part to form a preliminary joint. a lower tapered portion extending inwardly and obliquely upward from a predetermined point located above the tunnel portion and below the position that should be the lower end of the double seaming portion; A circumferential groove part having a dogleg-shaped cross section, which is formed by an upper tapered part extending outward and obliquely upward from the upper end of the lower cheek/4' part corresponding to the body hook lanoise, is formed in the preliminary joint part by spinning, and the lower part is formed by spinning. The part of the pre-joint section located directly below the chi/flat part is suppressed and supported by the opposing presser roll and rotating chuck, and while the lower side of the lower chi/flat part is supported by the rotating chuck, the upper chi (6) A double seaming method characterized in that a double seaming part is formed by pressing the double seaming part downward by spinning until the outer wall of the groove comes into contact with the outer surface of the lower cheek and flat part. It provides:

Furthermore, the present invention provides a double seaming device for forming a double seaming portion extending diagonally upward on the inner side that joins the open end of the can body and the end member, the device comprising: A preliminary joint formed by a straight cylindrical open end and an end member, comprising a rotary chuck having a groove and a pressing roll provided opposite the rotary chuck and having a circumferential surface having a shape corresponding to the circumferential groove. A device for forming a circumferential groove portion having a dogleg-shaped cross section, and a tee 1 having an inclination and length corresponding to a lower cheek groove portion of the circumferential groove portion.
a seaming rotary chuck having a lower straight cylindrical part connected to the tapered part and having an outer diameter smaller than the minimum inner diameter of the circumferential groove part, a presser roll that can be installed opposite to the lower straight cylindrical part, and The cross section is provided with a seaming roll that is rotatable and movable up and down and has a cheek circumferential surface having an inclination corresponding to the lower cheek ridge of the circumferential groove.
The present invention provides a double seaming device characterized in that it is equipped with a second seaming device that forms a double seaming portion from a preliminary joint portion in which a circumferential groove portion is formed.

(7) The present invention will be described below with reference to drawings showing embodiments.

First, as shown in FIG.
The inner wall 22 stands up more vertically, hangs down from the upper end of the inner wall 22 through the bent part 23, and is equal to the length of the cover hook (see 68 in Fig. 5(b)) of the double seam part to be formed. An end member having an outer wall 24 of a height, the outer diameter of the inner wall 22 is approximately equal to the inner diameter of the open end 26 of the can body 25, and the gap between the inner wall 22 and the outer wall 24 is approximately equal to the wall thickness of the open end 26. 27(:
In the case of M'-space cans, the lid and bottom, and in the case of two-piece cans, the lid) are manufactured by a pressing method or the like. The material of the end member 27 includes a steel-based sheet such as a tin-plated steel plate or tin-free steel, and a metal plate such as an aluminum (alloy) plate (including those with a coating film, a printed film, etc. formed on the surface). ), or metal foil (approximately 20 μm or more thick in the case of steel or iron-based foil to ensure seaming strength,
A laminate (8) of aluminum foil (preferably about 50 μm or more thick) and a glass film or sheet (8) is selected depending on the purpose of use.

Although not shown in FIG. 2, the outer wall 24 and the bent portion 23
．． As shown in FIG. 3, a sealing compound layer 20 is usually formed on the upper inner surface of the inner wall 22 to ensure sealing.

The can body 25 is made of a metal plate, a plastic sheet, a paper material (impregnated or coated with wax or plastics, etc.), a plastic sheet or film, a paper material,
It is formed by a laminate consisting of a suitable combination of metal foils. Instead of using the Sealink component described above,
In order to ensure the airtightness of the double seam, at least the inner layer and/or outer layer (not shown) of the open end 26 of the can body 25 and/or the inner layer and/or outer layer (not shown) of the end member The end member 27 is formed with a heat-fusible plastic film (for example, an acid-modified polyolefin resin), or a hot-melt adhesive is applied to the surface instead of the heat-fusible plastic film to form an open end 26 in the end member 27.
Thermal fusion or thermal bonding (9) may be performed after the insertion, during or after the double seaming.

Next, as shown in FIG. 2, the open end 26 of the can body is inserted into the gap between the inner wall 22 and outer wall 24 of the end member 27 to form a preliminary joint 28. Next, using the apparatus A shown in FIG. 2, a circumferential groove portion 29 having a dogleg-shaped cross section is formed in the preliminary joint portion 28 (see FIG. 3(,)). Device A is a rotating chuck 3
0, a press roll 31 and a rotating support plate 32 are provided. The rotary chuck 30 includes a cylindrical sleeve 33 in which a tapered portion 33a extending inwardly downward is formed at the lower part, and a split mold 3.
4 and a central shaft 35 for expanding the split mold 34, and a spring 36 for contracting the split mold 34 when the central shaft 35 is raised. The split mold 34 is made up of a plurality of split mold pieces 37, and the split mold pieces 37 have a vertical portion 38, a horizontal outer protrusion 39,
and a lower inner chi 9 section 40. Vertical part 3
The outer peripheral surface 38a of the sleeve 33 has a shape corresponding to the inner peripheral surface 33b of the sleeve 33.

As shown in FIG. 3(, ), the lower part 39a of the outer circumferential surface of the horizontal outer protrusion 39 has a straight cylindrical shape, and when the split mold 34 is expanded (the state shown in FIG. 2), the end member 27 (10 ), and has a size and shape that allows almost complete contact with the inner wall 22 of the horizontal outer protrusion 3'9, and as shown in FIG. A tapered portion 39b is formed that extends obliquely upward inward from 39a, and when the split mold 34 is expanded, the tenor f of the sleeve 33 is formed.
In cooperation with the section 33a, the lower part of the rotary chuck 30 has a cross section
A letter-shaped circumferential groove 41 is formed. The upper surface 39c of the horizontal outer protrusion 39 is configured to be slidable on the bottom surface 33c of the IJ-pu 33.

The lower inner cheek portion 40 engages with the lower cheek portion 35a of the central shaft 35, and when the central shaft 35 descends, the split mold 3
4 expands, and when the central axis 35 rises, the vertical part 3 of the split mold
The split mold 34 is configured to contract due to the action of a spring 36 surrounding the lower part of the mold 8.

In order to move the central shaft 35 up and down, a roller 42 that engages with a circumferential groove 35b formed at the upper end of the central shaft 35, a lever 43 that pivotally supports the roller 42 at one end, and a lever 4 are provided.
3, a driven roller 44 that is pivotally supported at the other end of the driven roller 44
A cam 45 that engages with the cam 45 and can move the driven roller 44 up and down, and a spring 46 that engages the driven roller 44 with the cam 45 are provided. The shaft 9-43 and the cam 45 are pivotally supported by a frame 47, and the central shaft 35 is vertically slidable along a bearing 48 provided in the frame 47. The sleeve 33 is pivotally supported by a stationary platen 49, and is rotated via gears 50, 51 by a drive mechanism (not shown).

The press roll 31 is disposed at a position facing the circumferential groove 41 of the rotary chuck 30, and can be moved toward and away from the circumferential groove 41 by a support body 52 that pivotally supports the press roll 31. The circumferential surface 31 a of the press roll 31 has a shape corresponding to the circumferential groove 41 of the rotary chuck 30 . It is rotatably supported by a rotary support plate 32.

Using the above-described apparatus A, the preliminary joint 28 is formed in the circumferential groove having a dogleg shape in cross section as follows.

First, in the position where the rotary support plate 32 is lowered, the end member 2
The can body 25 with the preliminary joint 28 formed between the can body 25 and the
It is placed on the rotation support plate 32 so that its axis coincides with the axis of the shaft 53. Next, when the center shaft 35 is raised and the split mold 34 is contracted, and the suppression roll 3
1 are separated, the rotary support plate 32 is raised to bring the end member 27 into contact with the bottom surface of the split mold 34, and then the center shaft 35 is lowered to expand the split mold 34 as shown in FIG. do. Next, when the gear 50 is rotated to rotate the sleeve 33, the can body 25 also rotates together with the rotary support plate 32. The press roll 31 is brought close to the rotating preliminary joint portion 28,
As shown in FIG. 3(,), the circumferential surface 31 of the pressure roll 31
a and the circumferential groove 41 of the rotary chuck 30, the preliminary joint 2
8 to form a circumferential groove portion 2 having a dogleg-shaped cross section in the preliminary joint portion 28.
9 is formed by spinning. The circumferential groove portion 29 is
/e 2 which is above the flannel part 21 and should be formed
Starting from a predetermined point P located below the position that should be the lower end 70 (see FIG. 5(b)) of the heavy winding portion 56 (see FIG. 5(b)), a lower cheek/flat portion 54 extends inward and obliquely upward as a point (13); 2
so that it is formed by an upper cheek/flat part 55 extending outward and obliquely upward from a position Q corresponding to the body hook radius 71 of the heavy winding part 56 (corresponding to the upper end of the lower cheek part 54); Depth of channel part 21 and split mold piece 3
The height of the horizontal outer protrusion 39 of 7 and the height of the horizontal outer protrusion 39 of
The position of the lower end 39b' of 9b is determined.

After forming the circumferential groove portion 29 as described above, the IJ-bu 33
rotation stops, the suppression roll 31 is separated, the center shaft 35 is raised by the rotation of the cam 45, and the split mold 34 is contracted.
The lower part 39a of the outer circumferential surface of the horizontal outer protrusion 39 is connected to the circumferential groove part 29.
It moves inward from the shortest inner diameter part Q' (that is, the inner part of the inner wall 22 deformed into a dogleg shape at position Q). After that, the rotary support plate 32 is lowered.

and the slope of the tapered portion 33'a of the sleeve 33' are (14) larger than the tapered portion 39'b and the tapered portion 33' of the device A, respectively.
The angle θ formed by 'a is approximately 90 degrees), that is, the circumferential groove 41' has a sharper angle θ than the circumferential groove 41 of the device A, and the circumferential surface 31'a of the suppression roll 31' has a circumferential groove 41'. Using a device B (the overall view is not shown) which has the same structure as device A except that it has a shape corresponding to
′ is formed. The reason why the circumferential groove portion 29' is formed in two steps as described above is because if it is done in one step, there is a risk that wrinkles will occur.

Therefore, if there is no risk of wrinkles occurring even in one step depending on the type and wall thickness of the materials constituting the can body 25 and the end members 27, the molding may be completed in one step.

Next, using the seaming device C shown in FIG.
As shown in FIGS. (a) and (b), a double seam portion 56 is formed from the circumferential groove portion 29'. In FIG. 4, reference numeral 57 denotes a seaming rotary chuck, and the circumferential surfaces of its lower straight cylindrical portion 57a and tee/IP portion 57b are the lower portion 39' of the outer circumferential surface of the split mold piece 37' shown in FIG. 3(b). It has the same shape and dimensions as the husband of the part a and the part 39'b.

Further, the outer diameter of the lower straight cylindrical portion 57a is determined to be smaller than the minimum inner diameter of the double-sealed portion 56, and the double-sealed portion 56 can be inserted into and removed from the end member 27 before and after forming. ing. The seaming rotary chuck 57 is fixed to the lower end of a vertical shaft 58, which is rotatably supported by a support 59 and rotated via a gear 60 by a drive mechanism (not shown). The support body 59 is rotatably provided around a vertical axis (not shown), and the vertical shaft 58 is eccentrically supported with respect to the rotation center, so that the lower straight cylindrical portion 57a of the seaming rotary chuck 57 and the tenor Part 4 57b
can be brought into close contact with the straight cylindrical inner wall portion 22a and the lower jaw 1 portion 22b after forming the circumferential groove portion 29' of the end member 27, respectively, and by further rotating the support body 59 in the reverse direction, the seaming rotary chuck 57 The can body 25 can be lowered by pulling the can body 25 away from the inner wall 22 without the end member 27 coming into contact with the seaming rotary chuck 57.

61 is a presser roll having a flat peripheral surface 61a,
It is rotatably supported by a support body 62, and the support body 6
Seaming rotary chuck 57 by moving 2
The lower straight cylinder part 57a of the seaming rotary chuck 57 cooperates with the lower straight cylinder part 57a of the seaming rotary chuck 57 to move toward and away from the straight cylinder inner wall part 22a of the edge material 27. The open end portion 26a of the can body 25 facing the inner wall portion 22a can be suppressed.

A seaming roll 65 is rotatably supported by a horizontal shaft 67 on a vertically movable support 66. The seaming roll 65 is attached to the lower cheek and flat part 5 of the circumferential g part 29'.
It is provided with a peripheral surface 65a having an inclination corresponding to 4',
The circumferential surface 65a is arranged so as to be movable up and down above the circumferential groove portion 29'. Although not shown, the device C further includes a rotary support plate having a structure similar to the rotary support plate 32 shown in FIG.

(17) Double seaming is performed using the above device C as follows. The can body 25 having the circumferential groove portion 29' is placed on a rotary support plate (not shown) in the lowering device so that its axis coincides with the rotary support plate. At that point, the seaming rotary chuck 5
7 is located at a position that substantially coincides with the axis of the can body 25, the presser roll 61 is spaced apart to the left, and the seaming roll is also located above. Next, the rotary support plate is raised to a position where the bottom surface of the seaming rotary chuck 57 and the mother tongue portion 21 of the end member come into contact.

Next, the support body 59 is rotated, and the presser roll 61 is moved to the right at the same time, so that the lower straight cylindrical portion 57a of the seaming rotary chuck 57 and the presser roll 6 are moved as shown in FIG.
The rotary chuck 5 presses and supports the straight cylindrical inner wall portion 22a of the end member and the open end portion 26a opposite thereto, and seams the lower jaw portion 22b of the inner wall between
The seaming rotary chuck 57 is supported by the taper portion 57b of No. 7 and rotated in the direction of the arrow, thereby rotating the can body 25 and the circumferential groove portion 29'. As shown in FIGS. 4 and 5(b), the seaming roll 65 is immediately lowered (18) and the upper cheek part 55' of the circumferential groove part 29' is cut so that the outer wall 24 is flat against the lower cheek part 55'. The double-sealed portion 56 is formed by pressing until it contacts the outer surface of the portion 54' and spinning. At this time, the pressing roll 61 and the seaming roll 65 rotate in the direction of the arrow.

The outer wall 24 serves as a cover hook 68 for the double seam portion 56,
The open end portion 26b located in the upper f section 55' becomes the dead hook 69. 70 is the lower end of the double-sealed portion 56, and 71 is the dehook radius. The double-sealed portion 56 is made airtight by the sealing compound layer 20 (note that the sealing compound layer 20 is not shown in FIG. 4).

According to the present invention, the circumferential grooves 29, 29' are formed by spinning, and since the pressing force acts in the horizontal direction, substantially no axial load is applied to the can body 25 at this time. In addition, the formation of the double-sealed portion 56 from the circumferential groove 29' means that the straight cylindrical inner wall portion 22a of the end member 27 and the opening end portion 26a that opposes it are connected to the lower straight cylindrical portion of the presser roll 61 and the seaming rotary chuck 57. 57a, and while the lower tapered portion 22b of the inner wall is supported by the cheek joint portion 57b of the seaming rotary chuck 57,
Since this is done by spinning, it has the effect that substantially no axial load is applied to the can body 25. Therefore, even if the can body 25 is made of a material with low axial load resistance due to thin wall thickness or relatively low rigidity, the double-sealed portion with excellent airtightness will not cause deformation such as buckling. It has the advantage that it is possible to form

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the main part for explaining the conventional double seaming method, and Fig. 1 (,) is a drawing showing the state before double seaming, and Fig. 1 (b) is A drawing showing a state in which a preliminary seaming part is formed, FIG. 1(c) is a drawing showing a state in which a double seaming part is formed, and FIG. FIG. 3 is a longitudinal sectional view of the apparatus, and FIG. 3 is a longitudinal sectional view of the main part for explaining the process of forming the circumferential groove, and FIG. (b) is a diagram showing the state in which the second step has been completed, FIG. 4 is a longitudinal cross-sectional view of the device for forming a double seam part from the circumferential groove, and FIG. 5 is a process of forming a double seam part. FIG.
Figure (,) is a drawing showing the state immediately before the formation of the double seaming part.
Figure (b) is a drawing showing the state after formation. 21... Mother flannel part, 22... Inner wall, 23... Bent part, 24... Outer wall, 25... Can body, 26... Open end, 27... End member, 28... Preliminary joint, 29.2
9'... Peripheral groove part, 30... Rotating chuck, 31...
・Press roll, 54° 54'...lower tee ・9 parts, 5
5.55'...Tsuchibe Chi/Hirabe, 56...Double seaming part,
57... Seaming rotary chuck, 57a... Lower straight cylinder part, 57b... Theno f part, 61... Pushing roll,
65...Seaming roll, 65a...(chietsuya) circumferential surface, 68...cover hook, 70...bottom end of double seaming part, 71...is dehook radius, A...circumference A device for forming grooves, C...Seaming device. Patent applicant Sho Kishimoto Figure 1 (a) (b) (c) JP-A-58-41633 (7) Figure 3 (a) (b) 31 (0) Figure 5

Claims (2)

[Claims] (1) A double seaming method for forming a double seaming part extending diagonally upward on the inside that joins the open end of the can body and the end member,
4. A straight cylindrical open end is inserted into the gap between the inner wall vertically rising from the flannel portion and the end member approximately equal to the double winding thickness that hangs down from the upper end of the inner wall via the bent portion. a lower tapered portion forming a preliminary joint portion and extending inwardly and obliquely upward from a predetermined point located above the panel portion and below the position that should be the lower end of the double seaming portion; A circumferential groove portion having a shape of a cross section formed by the upper end of the lower cheek and the flat portion extending obliquely upward outward from the upper end of the flat portion corresponding to the radius of the hook of the seaming portion is formed by spinning into the preliminary joint portion. forming a pre-joint portion located directly below the lower chi/flat portion while suppressing and supporting the portion of the preliminary joint portion by opposing presser rolls and a rotating chuck, and supporting the lower side of the lower tapered portion by the rotating chuck, A double seaming method comprising: pressing the upper chi/flat portion downward by spinning until the outer wall thereof comes into contact with the outer surface of the lower tapered portion to form a double seaming portion. (2) A double-sealing device for forming a double-sealing portion extending diagonally upward on the inner side that joins the open end of the can body and the end member, the device having a circumferential groove having a dogleg-shaped cross section. a rotating chuck having a rotary chuck and a pressing roll having a circumferential surface having a shape corresponding to the circumferential groove provided opposite to the rotating chuck; a device for forming a dogleg-shaped circumferential groove; a cheek groove having an inclination and length corresponding to a lower cheek groove of the circumference/groove;
A seaming rotary chuck having a lower straight cylindrical part connected to the chi/flat part and having an outer diameter smaller than the minimum inner diameter of the circumferential groove part, a presser roll that can be installed opposite to the lower straight cylindrical part, and rotating around a horizontal axis. A reserve formed with a circumferential groove portion having a dogleg-shaped cross section, comprising a seaming roll that is freely movable up and down and has a tapered circumferential surface having an inclination corresponding to the lower cheek groove portion of the circumferential groove portion. A double seaming device comprising a seaming device for forming a double seaming portion from a joint portion.