JP2018020330A - Winding-fastening device of can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding-fastening device of a can which can mold a double wound-fastened portion structure of a can capable of surely securing sealability without lowering a strength even when a thin can lid material is used.SOLUTION: In a winding-fastening device of a can, when on a cross section along a shaft core X and a shaft core Y1, a length in the shaft core Y1 of a base metal portion of a chuck is represented by H, a perpendicular line drawn in parallel with the shaft core Y1 from the maximum outer peripheral position of a first lower flange portion of a first wound-fastened roll is represented by Z1, an orthogonal line drawn in a direction orthogonal to the shaft core Y1 from the end point outside in a radial direction of an upper surface of the first lower flange portion is represented by M1, an intersection between the perpendicular line Z1 and the orthogonal line M1 is represented by P11, an intersection between the perpendicular line Z1 and the lower surface of the first upper flange portion is represented by P12, and a distance between the intersection P11 and the intersection P12 is represented by an opening width GW1, the opening width GW1 is formed so as to be larger than the length H.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a can winding device for sealing the inside of a can by double-tightening the outer periphery of a can lid at an open end of a can body.

  In a can filled with a soft drink or the like, an outer peripheral portion of a can lid is double-wrapped on an opening end portion of a bottomed cylindrical can body. Such a double winding portion of the can is a curl portion of the can lid in a state where the curl portion provided on the outer peripheral portion of the can lid is previously covered with the flange portion provided at the opening end portion of the can body. The can body is processed by being folded so that the curled portion and the flange portion are embraced while being folded back from the outside of the flange portion of the can body, and further pressed against the curled portion from the radial direction. The compound applied to the inner surface of the curled portion of the lid is formed in a sealed structure by interposing it between the can body and the can lid in a compressed state.

  Moreover, as described in Patent Document 1, for example, as described in Patent Document 1, the can body is held in the center axis direction (can axis direction) as a can winding device that double-tightens the can lid and the can body. ), A lifter that moves up and down, a chuck that is in contact with the can lid, a can lid that is sandwiched between the lifter and the chuck, and a can body that is slidably in contact with the can body from the outside in the radial direction, and the flange portion and the curl portion are involved A second winding which forms a double tightening portion by pressing the first winding roll (first seaming roll) to be held together and the winding portion of the flange portion and the curl portion further inward in the radial direction. An apparatus including a fastening roll (second seaming roll) is known.

  In recent years, it has been required to reduce the thickness of the can lid material in order to reduce costs. In such a double-clamped portion structure with a thin can lid material, the strength of the double-clamped portion decreases as the strength of the can lid material decreases, and the can lid lifts against the can body due to an increase in internal pressure. It is easy to cause troubles such as leakage of contents and a compound as a sealing material protruding from the double winding portion. Also, buckling is performed so that the can lid is reversed by the internal pressure, or when the impact is applied from the side due to the fall of each carton case containing the can, the double winding part is distorted in the radial direction and buckling occurs. There is also a risk.

  As a double-winding portion structure that ensures sealing performance in response to such thinning of the can lid material, for example, Patent Document 2 discloses a can at a position above the upper end of the cover hook portion of the double-winding portion. An upper step portion is disclosed by crushing the upper portion of the seaming wall portion of the lid and the body hook portion of the can body inside the lid inward in the radial direction. Further, instead of the upper stepped portion or together with the upper stepped portion, a lower stepped portion is formed by crushing the lower portion of the seaming wall portion at a position below the lower end of the body hook portion. In Patent Document 2, by adopting such a double tightening portion structure, the movement of the can lid when the internal pressure is applied is suppressed by the step portion, so that even when a thin cover material is used, it is good. It is described that a good sealing performance is maintained.

JP 2016-97416 A JP 2012-101854 A

  However, the tendency of thinning the can lid material has become stronger due to the demand for cost reduction, and it is required to further enhance the deformation strength of the double winding portion and maintain the sealing performance reliably.

  The present invention has been made in view of such circumstances, and has a double-clamping portion structure for a can that can reliably ensure hermeticity without reducing the strength even when a thin can lid material is used. An object of the present invention is to provide a formable can winding device.

  In the can tightening device according to the present invention, a counter sink part that forms an annular recess facing upward is continuously formed on the outer peripheral edge of the panel part, and upward from the outer peripheral edge of the counter sink part. An extending chuck wall portion is formed and extends radially outward while curving so as to protrude upward from the outer peripheral edge of the chuck wall portion, and the outer peripheral edge portion is directed downward and radially inward. A can-clamping device for processing a double-clamping portion by winding a can lid formed by continuously forming a folded-back flange curl portion onto a flange portion provided in an opening of a can body , A lifter for placing the can body, a chuck for pressing and holding the can lid placed on the can body, and the can body and the can in a state of being sandwiched between the lifter and the chuck The axis of the can body against the lid A first winding roll for winding the flange portion and the flange curl portion to approach the radial portion while relatively rotating around the radial direction, and processing the winding portion; And a second winding tightening roll that processes the double tightening portion by pressing toward the shaft, and the chuck is disposed on the axis X, and is added from the first winding tightening roll and the second winding tightening roll. A base metal part that supports the radially inwardly directed pressing force inside the chuck wall part, and a tapered part that is formed continuously with the base metal part and faces the inner peripheral surface of the chuck wall part; An annular projecting portion that is formed continuously with the tapered portion and engages with the counter sink portion, and the first winding roll is rotatably supported around its axis Y1, and the axis Y1 Position above direction An outer peripheral surface of the entrainment portion between the first upper collar portion, the first lower collar portion located on the lower side in the direction of the axis Y1, and the first upper collar portion and the first lower collar portion. A first molding recess for molding, and in a cross section along the shaft center X and the shaft center Y1, the length of the base metal portion in the direction of the shaft center Y1 is H, and the first lower collar portion A perpendicular drawn from the maximum outer peripheral position in parallel with the axis Y1 is Z1, and an orthogonal line drawn in a direction perpendicular to the axis Y1 from the radially outer end of the upper surface of the first lower collar is M1. An intersection point P11 between the perpendicular line Z1 and the orthogonal line M1, an intersection point P12 between the perpendicular line Z1 and the lower surface of the first upper collar, and a distance between the intersection point P11 and the intersection point P12 is defined as an opening width GW1. In this case, the opening width GW1 is formed larger than the length H.

In the can winding apparatus configured as described above, the first forming recess of the first winding roll has an opening width GW1 larger than the length H of the base part of the chuck. Is formed larger than the length H of the base metal part. When the entrainment portion is pressed radially inward by the second forming recess (see FIG. 4) of the second winding roll and crushed between the second forming recess and the base metal portion, the entrainment portion The lower part of the bottom enters the lower part of the base metal part. That is, since the winding width WC of the winding part is formed larger than the length H of the base part, the lower part of the winding part is not supported by the base part, and the upper part of the winding part is When pressed inward in the radial direction, the lower part of the entrainment part is tightened in a state of being bent inward in the radial direction.
In this way, by winding the lower part of the winding part in a bent state, the upper part of the double winding part has a can lid in order from the radially inner side in a posture along the can axis (axis X) direction. The back wall of the body, the body of the can body, the upper part of the cover hook part of the can lid, the upper part of the body hook part of the can body, and the seam wall part of the can lid (flange curl part, flange part before molding) And these are firmly pressed in the radial direction (thickness direction). On the other hand, at the lower part of the double winding part, the bottom part of the seaming wall part and cover hook part of the can lid and the lower end part of the cover hook part of the can body are bent radially inward with respect to the upper part, and the tip Is formed in a state of entering inward in the radial direction.
Thus, at the lower bent portion of the double tightening portion, the lower portion of the seam wall portion of the can lid and the lower portion of the cover hook portion are bent, while the lower end portion of the body hook portion of the can body is bent. By entering the state, the rigidity (deformation strength) in the radial direction and the axial center X direction in the double tightening portion is enhanced. Therefore, when the internal pressure is applied, the phenomenon that the can lid lifts against the can body can be suppressed, and even when subjected to a side impact such as dropping the carton case, there is little deformation and the seal is sealed. Sex can be reliably maintained.

  In the can tightening device of the present invention, the ratio (GW1 / H) of the opening width GW1 to the length H is preferably 1.2 or more and 2.2 or less.

In the upper part of the double tightening part, three cans are formed by a can lid that is folded twice at the upper end and the lower end, in the same manner as an ordinary double tightening part (without a bent part). It is necessary to secure a winding structure in which the can body material for two sheets is firmly pressed in the thickness direction by the can body that is folded once at the upper end portion and the ratio (GW1 / H ) Between 1.2 and 2.2, the distance from the upper end of the double tightening portion to the bending position can be within 60% to 85% of the overall height W of the double tightening portion. It is possible to ensure the effect of inhibiting the movement of the can lid with respect to the can body during internal pressure action, and to maintain the sealing performance.
In addition, when the ratio (GW1 / H) exceeds 2.2, the distance from the upper end of the double winding part to the bending position becomes short, and the state is pressed in the thickness direction at the upper part of the double winding part. It becomes difficult to secure a sufficient tightening structure portion. On the other hand, when the ratio (GW1 / H) is less than 1.2, the distance from the upper end of the double winding portion to the bending position becomes longer, and the portion that enters inward in the radial direction at the lower portion than the bending portion becomes smaller. The effect of inhibiting the movement of the can lid relative to the can body during the internal pressure action is reduced.

  In the can winding device of the present invention, in the cross section along the axis X and the axis Y1, the lowest point of the annular projecting portion is P13, and the upper end of the base metal portion to the lowest point P13. When the length in the direction of the axis Y1 is C, the ratio of the length H to the length C (H / C) is preferably 0.1 or more and 0.25 or less.

  If the ratio (H / C) is less than 0.1, it is difficult to sufficiently wind up the tip of the can lid by the first winding roll, and the sealing performance is secured by insufficient winding of the tip. Becomes difficult. On the other hand, when the ratio (H / C) exceeds 0.25, the pressure resistance of the can lid may be reduced.

  According to the present invention, since a double winding portion having a bent portion at the lower portion can be formed, even if a thin can lid material is used, the phenomenon that the can lid can be lifted with respect to the can body during internal pressure action can be suppressed, It becomes difficult to be deformed against an impact from the side when the carton case is dropped, and the sealing performance can be surely ensured.

It is a front view which shows a part of can winding apparatus of one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the relationship between a can body, a can lid, a chuck | zipper, and a 1st winding roll, and shows the state before winding. It is a longitudinal cross-sectional view which shows the state which made the 1st winding roll approach from the state shown in FIG. 2, and formed the winding part. It is a longitudinal cross-sectional view which shows the state which formed the double winding part by the 2nd winding roll from the state shown in FIG. FIG. 4 is a cut end view showing the relationship between the chuck used in FIGS. 2 and 3 and a first winding roll. FIG. 5 is a cut end view showing a relationship between a chuck used in FIG. 4 and a second winding roll. It is a longitudinal cross-sectional view which shows the double winding part structure wound by the winding apparatus of the can shown in FIG.

DESCRIPTION OF EMBODIMENTS Hereinafter, a can winding device according to an embodiment of the present invention will be described with reference to the drawings.
A can winding device 101 (hereinafter referred to as a winding device) of the present embodiment shown in FIG. 1 includes a can lid 20 ′ having a flange curl portion 29 that is wound back inward in the radial direction. 7 is wound around the flange portion 13 provided at the opening of the can, and as shown in FIG. 7, the double winding is wound so that the peripheral edge of the can lid 20 is entangled with the opening end of the can body 10 This is a device for processing the part 82. Hereinafter, as shown in FIG. 7, the vertical direction is specified along the can axis direction (X-axis direction) with the can lid 20 facing upward. In addition, before processing (before winding) of the double tightening portion 82, the can body is denoted by reference numeral 10 'and the can lid is denoted by reference numeral 20'. After processing of the double winding portion 82 (after winding) In FIG. 2, the can body is represented by reference numeral 10 and the can lid is represented by reference numeral 20.

FIG. 2 shows the can body 10 'and the can lid 20' before being double-rolled.
The can body 10 ′ before winding is a straight formed by punching an aluminum alloy plate material having a base plate thickness of 0.230 mm to 0.300 mm into a wide-mouthed cup shape, and then drawing and ironing (DI processing). This is a shape in which the opening end of the bottomed cylindrical body part 11 is slightly reduced in diameter and then expanded to form a flange part 13 extending radially outward from the upper end of the body part 11.

  On the other hand, the can lid 20 ′ before winding is formed by press-molding an aluminum alloy lid material having a base plate thickness of 0.235 mm or less, for example, 0.200 mm to 0.235 mm. A small-diameter circular panel portion 21 is formed at the center portion, and a counter sink portion 22 is formed on the outer peripheral edge of the panel portion 21 to form an annular recess facing upward. A chuck wall portion 23 extending toward the outer periphery is formed, and extends outward in the radial direction while curving so as to protrude upward from the outer peripheral edge (upper end) of the chuck wall portion 23, and the outer peripheral edge portion A flange curl portion 29 is continuously formed which is pushed back downward and radially inward.

  The counter sink part 22 is formed by an inner wall part 22a continuous with the panel part 21, a folded part 22b continuous to the lower edge of the inner wall part 22a, and an outer wall part 22c continued to the outer peripheral edge of the folded part 22b. Is done. The folded portion 22b may be formed by a plurality of arcs or a single arc in the longitudinal section. The outer wall portion 22c is inclined so as to increase in diameter as it goes upward.

The chuck wall portion 23 has two upper and lower curved portions 31 and 32 formed at an intermediate portion in the height direction, and protrudes radially inward from the upper end of the outer wall portion 22c of the counter sink portion 22. The inward bending portion 31 is curved in this manner, and the outward bending portion 32 is curved so as to protrude outward in the radial direction from the upper end of the inward bending portion 31.
In the example shown in FIG. 2, the outer wall portion 22c of the counter sink portion 22 and the inwardly curved portion 31 and the curved portions 31, 32 are directly connected to each other. Either or both of these may be formed with conical tapered portions.

  The flange curl portion 29 is formed by sequentially forming a curved flange portion 27 that extends while being curved radially outward from the outer peripheral edge of the chuck wall portion 23, and a curled portion 28 that is curled outward from the curved flange portion 27. The compound 5 is applied to the inner surface of the curled portion 28.

  The upper portion of the chuck wall portion 23 of the can lid 20 and the curved flange portion 27 and the curled portion 28 are deformed during winding, but the counter sink portion 22 and the panel portion 21 from the lower portion of the chuck wall portion 23 are shown in FIGS. As shown, the shape before and after winding is maintained substantially the same.

And the can winding apparatus 101 of this embodiment used for winding such can body 10 'and can lid 20' is comprised as follows.
As shown in FIG. 1, the can winding apparatus 101 has a can body 10 ′ placed on a turret of an unillustrated main body of a tightening machine, moved up and down along the axis X, and rotated around the axis X. The lifter 51 to be held and the can lid 20 ′ placed on the can body 10 ′ are pressed and held from above, and the chuck 52 disposed on the surface side of the can lid 20 ′ is interposed between the lifter 51 and the chuck 52. The first winding roll 53 and the first winding roll 53 that perform the winding process by approaching the can body 10 ′ and the can lid 20 ′ rotated around the axis X in the sandwiched state from the radially outer position as indicated by arrows. A plurality of sets of winding fastening units 55 formed in combination with the two winding fastening rolls 54 are provided at intervals in the circumferential direction of the turret. The lifter 51, the chuck 52, and the winding rolls 53, 54 move in the circumferential direction by the rotation of the turret of the winding machine body, and move between the lifter 51 and the chuck 52 between the can body 10 ′ and the can lid 20. ′ Is received and these are sandwiched and wound with winding rolls 53 and 54. FIG. 1 shows only one set of a winding unit 55 including a lifter 51, a chuck 52 and winding rolls 53 and 54.

  In this case, the chuck 52 is disposed on the same axis X as the lifter 51, and a pressing force applied radially inwardly applied from the winding rolls 53 and 54 at the time of winding is applied to the lower portion of the chuck wall 23. A base portion 61 supported on the inner side of the upper portion of the steel plate is formed outward in the radial direction so as to face the inner peripheral surface of the chuck wall portion 23 downward from the base portion 61 as shown in FIG. A taper-shaped portion 62 that is curved continuously extends, and an annular protrusion 63 that fits into the counter sink portion 22 is formed below the taper-shaped portion 62. As shown in FIG. 2, the tapered portion 62 is an outwardly curved portion of the can lid 20 ′ (in the state before the tightening, the radius of curvature is larger than that after the tightening, but will be described with the same reference numerals). The convex curved surface 64 facing the inner peripheral surface of 32 and the concave curved surface 65 facing the inner peripheral surface of the inwardly curved portion 31 are made continuous, and these convex curved surface 64 and concave curved surface are formed. Due to the continuous shape of 65, the taper shape is gradually reduced in diameter from the upper side to the lower side as a whole.

  Further, in a state where the annular protrusion 63 is fitted to the counter sink portion 22, the outer surfaces from the base metal portion 61 to the convex curved surface 64 and the concave curved surface 65 of the tapered portion 62 are as shown in FIG. A slight gap is formed between the inner surface of the chuck wall portion 23 of the can lid 20 ′, and with the gap formed in this portion, the tip of the annular protrusion 63 is the counter sink portion. The size is set so that the outer wall portion 22c of the 22 is difficult to insert. Further, the base 61 is formed by a cylindrical surface extending in a direction perpendicular to or slightly inclined from the upper end of the convex curved surface 64 with respect to the axis X in the range of θ = 0 ° to 8 °. It is formed (see FIG. 5).

  The first winding roll 53 is supported so as to be rotatable about the axis Y1 shown in FIG. 1, and the outer circumferential surface thereof is close to the can lid 20 'as shown in FIGS. A first molding recess 71 is formed along the circumferential direction to be guided and wound so as to follow the curled portion 28 of the can lid 20 '. The first molding recess 71 includes a first upper collar 72 positioned on the upper side of the first winding roll 53 in the direction of the axis Y1 and a first lower collar 73 positioned on the lower side of the axis Y1. It is formed in between, and has a shape in which a plurality of arc surfaces are continuously connected from the first upper collar 72 to the first lower collar 73.

  Further, the second winding roll 54 is rotatably supported about the axis Y2 shown in FIG. 1, and is wound around the outer peripheral surface by the first winding roll 53 as shown in FIG. A second molding recess 75 is formed along the circumferential direction for pressing the can lid 20 ′ and the can body 10 ′ of the entraining portion 81 radially inward. The second molding concave portion 75 is formed between the second upper collar portion 76 and the second lower collar portion 77, and the upper portion of the second molding concave portion 75 continuous from the second upper collar portion 76 is substantially the same. A substantially cylindrical surface is formed as a pressing surface 75a that presses the entraining portion 81 radially inward, and an inclined surface 75b whose lower portion is inclined radially inward from the pressing surface 75a. The second lower collar portion 77 projecting radially inward is continuously formed at the lower end of the inclined surface 75b.

  As for the chuck 52 and the first winding roll 53, the opening width (the length in the direction of the axis Y1) of the first molding recess 71 in the cross section along the axis X and the axis Y1 shown in FIG. Is set to GW1, and the opening width GW1 of the first molding recess 71 is formed to be larger than the length H of the base metal part 61, where H is the length of the base metal part 61 in the axis Y1 direction of the chuck 52. Has been. The opening width GW1 of the first molding recess 71 is the axis of the first winding roll 53 from the maximum outer peripheral position of the first lower collar 73 in the cross section along the axis X and the axis Y1 shown in FIG. A perpendicular drawn in parallel with Y1 is Z1, and is perpendicular to the axial center Y1 from the radially outer end point of the inclined surface 71a (the upper surface of the first lower collar 73) formed on the lower surface of the first molding recess 71. Assuming that the orthogonal line drawn in the direction of movement is M1, the intersection point P11 between the perpendicular line Z1 and the orthogonal line M1, and the intersection point between the perpendicular line Z1 and the upper surface of the first molding recess 71 (the lower surface of the first upper flange 72). The distance between P12.

Moreover, the ratio (GW1 / H) of the opening width GW1 of the first molding recess 71 and the length H of the base metal part 61 is 1.2 or more and 2.2 or less, and the length H of the base metal part 61 is For example, it is formed in 1 mm or more and 1.5 mm or less. Furthermore, the curvature radius R1 of the convex curved surface 64 continuous to the base metal part 61 is set to, for example, 0.3 mm or more and 1.5 mm or less.
Further, the lowest point of the annular protrusion 63 of the chuck 52 in the cross section along the axis X and the axis Y1 is P13, and the length in the axis Y1 direction from the upper end of the base metal part 61 to the lowest point P13 is defined as P13. In the case of C, the ratio (H / C) of the length H of the base metal part 61 and the length C of the annular protrusion 63 is 0.1 or more and 0.25 or less.

  Further, with respect to the chuck 52 and the second winding roll 54, the opening width of the second forming recess 75 (the length in the direction of the axis Y2) in the cross section along the axis X and the axis Y2 shown in FIG. Is set to GW2, the opening width GW2 of the second molding recess 75 is formed to be larger than the length H of the base 61. The opening width GW2 of the second forming recess 75 is the axis of the second winding roll 54 from the maximum outer peripheral position of the second lower collar 77 in the cross section along the axis X and the axis Y2 shown in FIG. A perpendicular drawn in parallel with Y2 is Z2, and an orthogonal line drawn in a direction perpendicular to the axis Y2 from the radially outer end point of the upper surface of the second lower collar 77 is M2, the perpendicular Z2 and the orthogonal line M2 The distance between the intersection P21 and the intersection P22 between the perpendicular Z2 and the lower surface of the second upper collar 76.

  In the present embodiment, the axis X of the can body 10 and the can lid 20 and the axis Y1 of the first winding roll 53, and the axis X and the axis Y2 of the second winding roll 54 are parallel to each other. It is arranged.

A method for manufacturing a can using the can winding device 101 configured as described above will be described.
First, as shown in FIG. 2, the flange portion 13 of the can body 10 ′ placed on the lifter (see FIG. 1) is covered with the flange curl portion 29 of the outer periphery of the can lid 20 ′, and the chuck 52 is placed over the can 52 from above. The can body 10 ′ and the can lid 20 ′ are sandwiched between the chuck 52 and the lifter 51 by being fitted to the lid 20 ′, and rotate around the axis X. Then, as shown in FIG. 3, the first winding roll 53 is approached from the outside in the radial direction, and the curl portion 28 of the can lid 20 'and the flange portion 13 of the can body 10' are pushed inward in the radial direction. The flange curl portion 29 of the can lid 20 ′ is wound while being folded back from the outside of the flange portion 13 of the can body 10 ′ in a hook shape to form a winding portion 81.

In this case, the chuck 52 prevents the annular projecting portion 63 from slipping into the countersink portion 22 and slipping between the can lid 20 ′, and the base portion 61 allows the upper peripheral surface of the chuck wall portion 23 to be To support.
Since the first molding recess 71 formed on the outer periphery of the first winding roll 53 has an opening width GW1 larger than the length H of the base metal part 61, as shown in FIG. The winding width WC of the part 81 is formed larger than the length H of the base part 61. Note that the length H of the base 61 is preferably shorter in order to improve the pressure resistance of the double tightening portion 82, but the tip of the can lid 20 'serving as the cover hook portion 26 is shown in FIG. As shown, a length of 38% or more of the entire height (winding width) W of the double winding portion 82 is necessary in order to reliably wind the first winding roll 53.

  Next, as shown in FIG. 4, the second winding roll 54 is made to approach the winding portion 81 of the can body 10 ′ and the can lid 20 ′ that are held and rotated by the lifter 51 and the chuck 52 from the outside in the radial direction. Thus, the outer peripheral portion of the winding portion 81 is pressed radially inward by the second molding recess 75 of the second winding roll 54, and the base metal portion 61 of the chuck 52 is pressed by the pressing surface 75a of the second molding recess 75. Crush further in the radial direction (plate thickness direction). At this time, since the winding width WC of the winding part 81 is formed larger than the length H of the base part 61, the lower part of the winding part 81 is not supported by the base part 61 of the chuck 52. In addition, since the lower part of the second forming recess 75 of the second winding roll 54 is formed on the inclined surface 75b, the winding portion is formed by the pressing surface 75a of the second winding roll 54 and the base 61. When the upper portion of 81 is pressed in the radial direction, the lower portion of the entraining portion 81 is directed radially inward by the inclined surface 75b and the second lower collar portion 77 below the pressing surface 75a of the second winding roll 54. As shown in FIGS. 4 and 7, the double winding portion 82 having the bent portion 41 is formed.

  As shown in FIG. 7, the double tightening portion 82 processed by the tightening device 101 is folded back from the upper end of the body portion 11 to the outer peripheral side and extends downward as shown in FIG. A body hook portion 12 is formed. Further, the can lid 20 portion is folded back from the outer peripheral edge of the chuck wall portion 23 to the outer peripheral side, and is disposed so as to cover the upper end portion of the can body 10, and the seaming panel portion 24. A seaming wall portion 25 that extends downward from the outer peripheral edge and covers the outer periphery of the body hook portion 12 of the can body 10, and is folded back inward in the radial direction from the lower end of the seaming wall portion 25. A cover hook portion 26 that extends upward and is provided between the body hook portion 12 and the body portion 11 so as to enter from below is formed. Further, the chuck wall portion 23 is formed with a backup wall portion 33 that rises substantially vertically from the upper end of the outward curved portion 32 and continues to the inner periphery of the seaming panel portion 24.

In the upper part of the double tightening portion 82, the backup wall portion 33 of the can lid 20, the body portion 11 of the can body 10, the upper portion of the cover hook portion 26 of the can lid 20, and the body hook of the can body 10. The upper part of the part 12 and the upper part of the seaming wall part 25 of the can lid 20 are superposed in a posture substantially along the can axis (X axis) direction, and these are firmly pressed in the thickness direction (radial direction) Become. On the other hand, at the lower part of the double winding part 82, the body part 11 of the can body 10 is greatly curved radially inward below the outwardly curved part 32 of the can lid 20 to form a concave curved part 42. In addition, the lower portion of the cover hook portion 26 of the can lid 20 and the lower portion of the seaming wall portion 25 are bent radially inward with respect to these upper portions, and the cover hook portion 26 is inserted into the concave curved portion 42 of the body portion 11. It is molded in a state in which the lower part of is inserted.
Note that the outwardly curved portion 32 of the chuck wall portion 23 has a smaller radius of curvature than that before being tightened by being tightened.

  In addition, a bent portion 41 is formed along the circumferential direction at the lower portion of the double winding portion 82 so as to bend its lower end portion radially inward. The bent portion 41 is formed such that the lower end portion of the seaming wall portion 25 of the can lid 20 and the lower end portion of the cover hook portion 26 are bent inward in the radial direction, and the seaming wall portion 25 and the cover hook portion 26 are bent. The lower end portion of the body hook portion 12 of the can body 10 that is bent in the same manner as described above is inserted between the lower end portion and the lower end portion.

  Further, the body portion 11 of the can body 10 is also bent so as to follow the outer surface shape of the outwardly curved portion 32 of the chuck wall portion 23. For this reason, a concave curved portion 42 that enters inward in the radial direction is formed at a position below the bent portion along the circumferential direction, and is disposed so as to sink under the outward curved portion 32 of the chuck wall portion 23. ing.

As shown in FIG. 7, the double winding portion 82 formed in this way has an inner peripheral surface (radially outer side) of the backup wall portion 33 of the chuck wall portion 23 in the longitudinal section of the double winding portion 82. When the perpendicular E is drawn along the can axis direction (axial center X direction), the concave curved portion 42 is arranged radially inward from the perpendicular E. Further, the front end of the bent portion of the cover hook portion 26 is disposed radially inward with respect to the perpendicular F from the outer surface of the portion in front of the folded portion of the body portion 11 in the upper half of the double winding portion 82. The
The compound 5 provided in the curled portion 28 of the can lid 20 ′ before winding is compressed into the lower clearance portion 5 B between the tip of the body hook portion 12 of the double winding portion 82 and the can lid 20. The surplus portion is stored in the upper clearance portion 5A between the front end of the cover hook portion 26 and the can body 10.

In addition, the preferable dimension example of the double winding fastening part 82 is as follows.
Plate thickness of the flange portion 12 of the can body 10: 0.14 mm to 0.19 mm
Thickness of can lid 20: 0.200 mm to 0.235 mm
Overall height of the double winding portion 82 (winding width): W = 2.00 mm to 3.15 mm
Among these, the distance L from the upper end of the double winding portion 82 to the bending position Q on the outer surface of the bending portion 41 is 60% or more and 85% or less of the overall height (winding width) W of the double winding portion 82. It is good to set it in the range.

In the can having the double tightening portion 82 configured as described above, when the internal pressure rises, the can lid 20 tends to be pushed upward with respect to the can body 10 by the pressure. The lower part of the portion 82 is bent inward in the radial direction, and the can lid 20 and the can body 10 are overlapped with each other in the bent state. Relative movement of the lid 20 in the vertical direction is prevented. Further, in the vicinity of the concave curved portion 42 of the can body 10, the internal pressure presses the concave curved portion 42 outward, so that it enters the concave curved portion 42 and the concave curved portion 42. Between the lower portion of the cover hook portion 26 of the can lid 20 is firmly pressed. Between the concave curved portion 42 and the lower portion of the cover hook portion 26, there is a path leading to the upper clearance portion 5A. When this portion is in pressure contact, the compound in the upper clearance portion 5A leaks out. There is an effect to prevent.
Therefore, according to such a double tightening portion structure, even if a lid material having a plate thickness of 0.235 mm or less and easily deformed is used, the can lid 20 is not easily pushed up against the can body 10, and Since the gap acting as the passage of the compound 5 acts in the direction in which the gap is pressed by the internal pressure, a gap is hardly formed between the can body 10 and the can lid 20, and good sealing performance can be maintained.

  In this case, in the upper portion of the double winding portion 82, the can lid material for three sheets can be obtained by the can lid 20 that is in a double diffracted state at the upper end portion and the lower end portion, similarly to the normal double winding portion. The can body 10 is in a folded state at the upper end, and the can body 10 for two sheets is tightly pressed in the thickness direction by the can body 10. If the distance L to the bending position Q is too short, it is difficult to ensure a sufficient amount of the winding structure that is pressed in the thickness direction at the upper part of the double winding part 82, and the distance L to the bending position Q If the length is too long, the portion that enters radially inward in the lower portion than the bent portion 41 becomes small, and the effect of inhibiting the movement of the can lid 20 relative to the can body 10 during the internal pressure action is reduced. For this reason, it is preferable to set the distance L to the bending position Q so that the ratio (L / W) is 0.60 to 0.85 with respect to the overall height W of the double tightening portion 82. .

In this regard, in the can tightening device 101 of the present embodiment, the ratio (GW1 / H) between the height H of the chuck 52 and the opening width GW1 of the first winding roll 53 is 1.2 or more and 2.2 or less. By using the winding device 101 having such a configuration, the distance L from the upper end of the double winding portion 82 to the bending position Q is set to 60% or more and 85% of the overall height W of the double winding portion 82. It can be contained below. Accordingly, it is possible to ensure the effect of inhibiting the movement of the can lid 20 with respect to the can body during the internal pressure action and maintain the sealing performance.
When the ratio (GW1 / H) exceeds 2.2, the distance L from the upper end of the double tightening portion 82 to the bending position Q becomes short, and in the thickness direction above the double tightening portion 82. It becomes difficult to sufficiently secure the winding structure portion in a pressed state. On the other hand, if the ratio (GW1 / H) is less than 1.2, the distance L from the upper end of the double winding portion 82 to the bending position Q becomes longer, and the portion that enters radially inward at a portion below the bending portion 41. Becomes smaller, and the effect of suppressing the movement of the can lid 20 relative to the can body during the internal pressure action is reduced.

  Further, in the can winding device 101, the ratio (H / C) between the length H of the base 61 and the length C of the annular protrusion 63 is 0.1 or more and 0.25 or less. The first winding roll 53 can surely wind up the tip of the can lid 20 ′, and can seal the can. If the ratio (H / C) is less than 0.1, winding by the first winding roll 53 may be insufficient, and it becomes difficult to ensure sealing performance. On the other hand, if the ratio (H / C) exceeds 0.25, the pressure resistance of the can lid 20 may be reduced.

In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.
In the embodiment, the first winding roll 53 and the second winding roll are sandwiched between the lifter 51 and the chuck 52 while the can body 10 ′ and the can lid 20 ′ are sandwiched and rotated around the axis X. As a method of tightening while revolving the first winding roll 53 and the second winding roll 54 around the axis X without rotating the lifter 51 and the chuck 52, the winding 54 is approached. Also good. That is, in the present invention, the lifter 51 and the chuck 52, and the first winding roll 53 and the second winding roll 54 are configured to rotate relatively around the axis X.

  Further, in the example shown in FIG. 1 of the present embodiment, the shaft center X of the lifter 51 and the chuck 52 and the shaft centers Y1 and Y2 of the winding rolls 53 and 54 are arranged in parallel. Thus, it is possible to configure so as to perform so-called inclined winding tightening, in which the axial centers Y1, Y2 of the winding rolls 53, 54 are inclined with respect to the lifter 51 and the axial center X1 of the chuck 52.

10, 10 'can body 11 body portion 12 body hook portion 13 flange portion 20, 20' can lid 21 panel portion 22 counter sink portion 23 chuck wall portion 24 seaming panel portion 25 seaming wall portion 26 cover hook portion 27 curved flange Part 28 curl part 29 flange curl part 31 inwardly curved part 32 outwardly curved part 33 backup wall part 41 bent part 42 concave curved part 51 lifter 52 chuck 53 first winding tightening roll 54 second winding tightening roll 55 winding tightening unit 61 Base portion 62 Tapered portion 63 Annular protrusion 64 Convex curved surface 65 Concave curved surface 71 First molding recess 71a Inclined surface 72 First upper collar 73 First lower collar 75 Second molding recess 75a Press surface 75b Inclined surface 76 2nd upper collar part 77 2nd lower collar part 81 Entrainment part 82 Double winding part 101 of can Clamping device

Claims (3)

A counter sink part forming an annular recess facing upward is continuously formed on the outer peripheral edge of the panel part, and a chuck wall part extending upward from the outer peripheral edge of the counter sink part is formed, A flange curl portion that extends radially outward while curving so as to protrude upward from the outer peripheral edge of the chuck wall portion, and is continuously bent downward and radially inward. A can lid that is formed by winding a can lid on a flange portion provided in an opening of the can body to process a double tightening portion,
A lifter for placing the can body;
A chuck that holds and holds the can lid placed on the can body from above;
The flange approaches the can body and the can lid from the radially outer position while rotating relatively around the axis X of the can body while being sandwiched between the lifter and the chuck. A first winding roll for winding the portion and the flange curl portion to process the winding portion;
A second tightening roll that presses the entrainment portion radially inward to process the double tightening portion;
The chuck is disposed on the axis X, and a base metal that supports a radially inwardly applied pressing force applied from the first winding roll and the second winding roll inside the chuck wall portion. A taper-like portion that is formed continuously with the base metal portion and faces the inner peripheral surface of the chuck wall portion, and an annular protrusion that is formed continuously with the taper-like portion and fits into the counter sink portion And
The first winding roll is rotatably supported around its axis Y1, and has a first upper collar portion located on the upper side in the direction of the axis Y1 and a first position located on the lower side in the direction of the axis Y1. A lower collar part, and a first molding recess for molding an outer peripheral surface of the entrainment part between the first upper collar part and the first lower collar part,
In a cross section along the axis X and the axis Y1,
The length of the base metal in the direction of the axis Y1 is H,
A perpendicular line drawn from the maximum outer peripheral position of the first lower collar part in parallel with the axis Y1 is defined as Z1, and is drawn in a direction orthogonal to the axis Y1 from the end point on the upper surface of the first lower collar part in the radial direction. The perpendicular line M1 is the intersection point P11 of the perpendicular line Z1 and the orthogonal line M1, the intersection point P12 of the perpendicular line Z1 and the lower surface of the first upper collar part, and between the intersection point P11 and the intersection point P12. When the distance is the opening width GW1,
The can tightening device, wherein the opening width GW1 is formed larger than the length H.   The can tightening device according to claim 1, wherein a ratio (GW1 / H) of the opening width GW1 and the length H is 1.2 or more and 2.2 or less.   In the cross section along the axis X and the axis Y1, the lowest point of the annular protrusion is P13, and the length in the axis Y1 direction from the upper end of the base metal part to the lowest point P13 is The can according to claim 1 or 2, wherein a ratio (H / C) between the length H and the length C is 0.1 or more and 0.25 or less when C is used. Tightening device.

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