JP2011525458A - Can body and method and apparatus for manufacturing the can body - Google Patents

Abstract

To find a solution by which a stable and airtight can can be manufactured easily and inexpensively.
[Solution]
In a can body (1) comprising a can mantle (3) closed about a can axis (2) including a metal layer and a closure member (13, 33, 56) containing a metal layer, the can body (1) is closed In the overlapping region (53) of the member (13, 33, 56) and the can outer shell (3), a leather joint is formed along the connecting line between the metal layer of the can outer shell (3) and the closing member (13, 33, 56). It is formed between. The leather joint has a number of narrow or confined areas where many interruptions along the bond line or both metal layers are welded together. Synthetic resin materials (3b, 7a, 13d, 15, 54, 58) are arranged in the leather joint portion. Leather joints ensure stability, and synthetic resin materials (3b, 7a, 13d, 15, 54, 58) ensure sealing.
[Selection] Figure 1c

Description

  The present invention relates to a can body based on the superordinate concept of claim 1, a method for producing a can body based on the superordinate concept of claim 10, and an apparatus for producing a can body based on the superordinate concept of claim 13.

  The aerosol can body is formed of one member or multiple members. In a one-part aerosol-aluminum can body, a cylindrical can body is prepared by a cold flow press. Subsequently, a valve seat is formed at the open end by crushing necking. This manufacturing method is very expensive based on the equipment required for the four processing steps, water requirements for cleaning and drying, and energy needs. US Pat. No. 4,095,544 (Patent Document 1) and European Patent No. 0666124 (Patent Document 2) describe the production of seamless steel cans. At this time, a cylindrical can body is punched out and manufactured from a steel sheet coated with zinc or synthetic resin by pressing and stretching. It has been shown that a surprising problem arises in the formation of narrowed can necks because the material structure is altered or cured by stretching.

  The can body made of a thin steel plate is also widened, and the outer shell of the can body has a vertical weld seam. The bottom and the upper closing part (lid) are fixed to the can mantle through the folding joint. Fold coupling creates sealing problems and approximately reduces packing rings. Problems are caused by the packing placed on the front side in the case of ordinary outermost thin-walled cans.

  A solution is known from WO 05/000498 (Patent Document 3). In this solution, the bottom of the can is closed by a leather seam, and the bottom of the can is closed by a leather seam. Has been. A narrow part is formed on the front side. For this purpose, the shape roll is pressed against the rotating can mantle from the outside. A support side is arranged inside the can jacket, and is moved in the direction of the upper front in cooperation with the shape roll when narrowing. At the narrowed end, a closure (lid) element is securely welded to the valve seat. In some cases, the upper end of the can mantle is narrowed by crushing necking or spin flow necking, and this narrowing can be performed until the valve seat is shaped. The valve seat is shaped by an outwardly deformed can end, and the valve seat is substantially circular in a cutting plane that includes the can longitudinal axis. The free end is extended back from the inside to the outside with respect to the outer surface of the can mantle narrowed from the outside. In the valve seat, so-called outward-curl or outward edge folding is handled.

  A solution is known from WO 05/068127 (patent document 4), in which the can shell with a butt leather longitudinal seam is shaped radially outwardly to form an inner shape. To be pressed. The bottom of the can is firmly welded to the lower front of the can jacket. On the top front, a closing (lid) element with a valve seat with a leather seam is arranged. In some cases, instead of an upper closure (lid) element, a narrowing method such as squeezing necking or spin flow necking is performed on the upper end of the can shell. This narrowing is performed to shape the valve seat. This illustrated embodiment shows an outward-curl or outward edge fold.

US Pat. No. 4,095,544 European Patent No. 0666124 International Publication No. 05/000498 International Publication No. 05/068127 Specification

  The object of the present invention is to find a solution by which a stable and airtight can can be produced easily and inexpensively.

  This problem is solved by the features of claims 1, 10 and 13. The dependent claims describe preferred or alternative embodiments.

  In order to fix a closure (lid) member arranged in front of the can wall, solutions are known from the prior art in which a weld seam is formed which is closed in a tight ring shape by means of a leather weld seam. In such a continuous razor weld seam, it has been shown that the abutting contact areas of the two parts to be joined together have no contamination or coating. In addition, the contamination or the coating ratio shifts to a gas state like an explosion based on the large heat generated in the seam region, and at this time, the seam breaks and thereby an unsealed portion is generated. To overcome these drawbacks, in any can, the challenge is to find a bond that does not cause a bond failure due to slight contamination or coating.

  In solving the problem, it was recognized that in the first step, the metal layer of the can mantle, the metal layer of the closure (lid) member and the leather joint between them must guarantee only the stability of the can. . Sealing is achieved by an internal coating or synthetic resin material associated with the leather joint, which is closely connected to both members.

  In the second stroke, the laser joint brings about a little heat along the bond line due to four interruptions, or the laser light rays contaminate both metal layers together, creating a risk of gas development such as an explosion. Has been significantly reduced.

  These solutions with a large number of narrowly confined bonding points and tight plastics are preferably or inserted by metal layers in all can mantles and closure elements, so they are not limited to aerosol cans, of course It is not limited to a special aerosol can with one edge decoration.

  Another advantage of such circular razor joints with a row of narrowly defined joint areas is that they can be implemented by a razor scanning device. That is, the razor beam is guided along the bond line, for example via mirror movement, and the razor is alternately passed or interrupted, resulting in proper coupling and interruption. Can rotation can be abandoned through the spill point of the leather based on scannability. The leather spill head must not be moved along the bond line.

  If the can neck or aerosol can seat is manufactured as a separate piece and connected to a single narrowed cannula, according to a preferred embodiment, the weld area is interrupted in the peripheral direction, In particular, a spot welding region is formed.

  Such interrupted weld connections are preferably used to secure the can bottom to the can mantle. The bottom of the can is pressed from the inside of the can onto the narrowed end region of the can mantle, and is fixed substantially overlying the narrowed region due to the interrupted leather connection. For example, if there is no access to the peeled end of the can mantle and the can bottom is brought into the can mantle and to the desired fixing area, the can bottom is directly narrowed in the fixing area by narrowing the can mantle. The possibility of bringing inside arises.

  Since the radius of the can bottom is larger than the radius of the opening in the narrowed fixed area of the can bottom, the round cross section of the can mantle in the fixed area of the can bottom is transformed into an elliptical free cross section by slight pressure or pressing. At this time, the opening cross section is increased in the first direction and reduced in the second direction standing perpendicular thereto. When the bottom of the can is inclined with respect to the plane of the elliptical opening, the bottom of the can can be inserted into the can mantle and can be pressed from the inside to the narrow portion after the insertion return inclination. In the overlap region, the can bottom can be secured to the can mantle by a leather connection with interruptions. A continuous and airtight inner coating can be formed by a ring-shaped or disc-shaped synthetic resin material along a leather bond.

  In the longitudinal seam, the thermal peak that flows with the seam formation results in unwanted edge decoration at the material edge, where the thermal peak can no longer flow further in the longitudinal direction. These problems do not occur when long, continuously formed longitudinal seams are formed and the cannula is separated from the appropriate tube. It has been shown that the problem can be solved in the production of can shells made of mantle parts or plates, since a leather bond with many interruptions is formed along the bond line instead of a continuous leather seam. The interruption prevents the integral flow of heat, and therefore heat spread problems are eliminated at the end of the bond or at the mantle. Such a can shell longitudinal bond includes a number of narrowed and narrowed areas, in which two metal layers with overlapping laser beams are welded together. When the can jacket material is coated on the inside, and a continuous inner coating of the can jacket is desired, a synthetic resin is disposed inside the can along the longitudinal seam. It is intimately coupled with the inner coating.

  According to another embodiment, the can jacket with the formed valve seat is formed into an internal shape by a radially expanding press stroke, the internal shape in particular matching the desired end shape of the can jacket. The internal shape can arbitrarily have a shape or a decorative structure that deviates from the cylindrical shape. At this time, the valve seat and the can jacket on the valve seat are held in an internal shape during pressing. The valve seat is not enlarged. The holding of the can mantle on the valve seat ensures a defined position of the can mantle with respect to the internal shape. In order to press, a press bar capable of acting on the compressed fluid elastically is inserted into the cannula.

  In forming the inner shape, a shape corresponding to the connection area of the can bottom can be formed at the free end of the can mantle facing away from the valve seat. The can bottom is subsequently secured to the can mantle by a leather bond.

  According to another embodiment, the free end, optionally attached to the can bottom of the can jacket, is brought into contact with its external shape only after insertion of the can bottom. This measure is possible for any can, and in its manufacture the can mantle is connected to the can bottom. A roll method is used in particular for narrowing the can end after insertion of the can bottom. In this case, the rotating roll is moved around its periphery relative to the can mantle. The desired narrowing profile for the narrowing area of the can mantle is formed on the can bottom inserted and held there, and in particular also on the shape roll. In the roll process, the can mantle is densely pressed against the contact area of the can bottom.

  The front of the can bottom is located in the inside of the can or on the inner side of the can, and the front of the can jacket is located on the outside of the can outer shell or on the outer side of the can. When the outer surface of the can shell is provided with a decoration, the decoration extends downward substantially to the standing surface. Therefore, the can is particularly attractive in a star shape, and the curvature region is noticeable from a can with no decoration from the cylindrical mantle to the can bottom.

  The can bottom, which is reduced in cross-section with respect to the front of the can mantle, and the can fit to each other in the shoulder shape of the can mantle abuts closely together so that the can bottom located inside can sometimes be slightly slightly It can be moved outwardly in the direction of the axis, so that the abutment area of the can mantle is enlarged to a minimum and is attached to the can bottom with intimate contact. In the region of this intimate contact, a ring-closed leather connection can be attached between the can mantle and the can bottom.

  Within the scope of the present invention, it has been found that the leather peripheral seam between the overlapping areas of the can bottom and the can mantle need not be in close contact, particularly in front of the can mantle. The leather perimeter seam preferentially fulfills the task of stably connecting the can mantle to the can bottom. The seam does not tear even at the internal pressure required for aerosol cans. However, it has been shown that a stable bond that is not reliably tight is achieved at a significantly lower cost than an absolutely tight leather perimeter seam. This is based on the leather perimeter seam being very narrow, for example substantially 0.15 mm wide. If there is a slight contamination in one of the parts to be joined in the seam area, there will be evaporation during the welding, such as an explosion of the contamination rate, in particular oil or oil proportion. In these places, a short break occurs at the leather peripheral seam.

  Since the bottom of the can is finished by a manufacturing method or shape method that uses a lubricant, optionally in other production locations, contamination due to manufacturing or transportation can never be completely removed at an acceptable cost. However, it is possible to install a barrier inside the can between the bottom of the can and the can mantle at a small cost, which tightly closes the inside of the can against the outside at the leather weld seam. Since the outermost small average spot is handled in the tightest part of the leather seam as close as possible, the barrier must be subjected to particularly great forces.

  In order to be able to provide a tight barrier between the can mantle and the bottom of the leather at the seam seam, or in the area of the leather joint with a single narrow confined joint area, in another preferred and -independent claim Irrespective of the claimed invention-According to the solution of the invention, a synthetic resin material is arranged along the entire circular leather peripheral seam or leather joint inside the can, and the can bottom and the can mantle are intimately connected. Yes. This eliminates access from inside the can to the leather peripheral seam or leather joint. Leather perimeter seams or leather joints ensure the required rigidity, and the synthetic resin material connected to the floor and can jacket ensures sealing.

  Synthetic resin material along the leather peripheral seam can be placed on the bottom of the can as a ring or pan with a ring edge, and can be sprayed by a nozzle, or it can also be constructed on the bottom of the can during the injection stroke. Intimate bonding of the ring to the can mantle and possibly the can bottom is achieved on both sides of the leather peripheral seam by one heat treatment process before or after the formation of the leather peripheral seam.

  If the can jacket has one synthetic resin layer inside or in particular in the form of a foil, a sealed end synthetic resin material along the leather peripheral seam between the can bottom and the can jacket can be inserted particularly preferably. Cylindrical can jacket with a can bottom comprising a synthetic resin layer facing the inside of the can along the radial outer edge or upwardly on the metal edge area of the can bottom with respect to the inside of the can Can be inserted. After insertion, the radially outer contact area of the synthetic resin layer on the bottom of the can comes into contact with the inner layer of the can mantle.

  It allows the process of merging the area of the can mantle and the closure element in different configurations and leather connections. This is confirmed by the following example.

  If the can mantle in the end region where the can bottom is located is approximately narrowed, it has an outer diameter that is approximately larger than the through opening in the region where the can bottom is narrowed. When the round cross section of the can mantle is deformed into an elliptical cross section by a slight pressure or by pressing in the fixed area of the can bottom, the opening cross section expands in the first direction and in a second direction that stands perpendicular to that direction. to shrink. The bottom of the can is inclined about an axis extending substantially parallel to the first direction with respect to the plane of the elliptical opening, and then inserted into the interior of the can shell. After insertion, the can bottom is tilted back and pressed from the inside to the narrow part. In the overlap region, the can bottom can be secured to the can mantle by a leather connection. A continuous and dense inner coating can be achieved with a ring-like or disc-like synthetic resin material which internally follows a leather bond.

  As already described, the end region of the can mantle can be transformed into a shoulder-like contact surface at the bottom of the can by a deformation process and fixed by a leather peripheral seam. The synthetic resin layer on the bottom of the can is connected to this inner layer in a contact area with the inner layer of the can jacket by a heat treatment process. For this purpose, the synthetic resin layer at the bottom of the can optionally contains a sealing material at least in the desired area of bonding. Since the heat treatment step is sometimes performed before the deformation step, the can bottom is already attached to the can mantle at the time of deformation.

  When the deformation of the can mantle at the bottom of the can after insertion of the can bottom should be given up, the can mantle is formed with a ring groove-shaped receiving area in the contact area that protrudes outwardly in line with the can bottom. Since the can bottom is compressed against the can mantle from the outside or the bottom, the contact area of the can bottom reaches the holding area of the can mantle and is held there. It positions the convex ring groove region from the outside of the can bottom to the concave ring groove region from the inside of the can shell. The front surface of the can bottom is located inside or inside the can, and the front surface of the can jacket is located outside or on the can outer surface.

  At the free lower end of the can mantle, ie at the can bottom, the cross section of the can mantle increases slightly relative to the top and then decreases again. Since the narrow part of the lower cross section must be very small, the can bottom with the largest outer diameter is pushed into the can mantle. During the pressing, the material region is approximately elastically expanded in the narrow part of the lower cross section, or the can bottom is approximately narrowed at the maximum outer diameter. In the pushed-in can bottom, the shoulder of the can bottom abuts against the matching shoulder of the can mantle inside along the entire periphery. In this shoulder region, the cross-section decreases so widely that a stopper is formed from the free end of the can mantle. Leather peripheral seams are formed along shoulder regions that are closed in a circle and pressed together. After the narrowed shoulder region, the diameter of the can mantle increases again. A deep groove is visible from the outside to the can mantle in the shoulder region and directly on it.

  It is preferred when the contact area of the can bottom is inserted inside the can mantle. The thickness of the can bottom is usually chosen to be slightly larger than the thickness of the can jacket. Optimal press fit is achieved when the stable shoulder region is pressed against the slightly more stable shoulder region from the inside. Suitably, the shoulder area of the can bottom is approximately shape stable than the shoulder area of the can mantle. The outer shoulder region is sometimes rotated slightly in the peripheral direction, in which case the inner and stable shoulder region is not deformed or crushed. If the can mantle is on the inside and the stable can bottom is on the outside, a crushing surface may form on the can mantle based on the pressing force, which would prevent a dense leather peripheral seam.

  In order to ensure a universal inner covering during the transition from the can shell to the can bottom, the can bottom is provided with a sealing projection which is internally coated and weldable. The can jacket is covered with a foil inside, and the shoulder region connecting the bottom of the can has no coating. The can bottom has no coating at least in the shoulder region on the outer surface facing away from the can interior. The leather peripheral seam is formed between the metal areas of the can shell and the can bottom that are in direct contact with each other. The weldable sealing projection is heated to cover the front surface of the can bottom located inside the can and the uncovered area connected to the can bottom of the can mantle, and the material of the sealing projection is coated on the inner surface of the can mantle and the can bottom. Flow and connect to cure so as to form a perfect bond between the two.

  In order to prepare a protective layer on the lower surface of the can, an outer can cover is fixed to the lower can end, in particular in the form of a synthetic resin bottom. If the bottom cover extends approximately along the can wall from the can bottom, the bottom cover can engage the deep groove directly on the peripheral seam. In this case, the bottom cover covers the lower front of the can jacket and the leather peripheral seam. The bottom cover is tightly connected to the can mantle in the deep groove and the can wall includes the outer foil, so the metal layer on the can mantle and the can bottom is tightly closed to the outside, eliminating oxidation problems. obtain. Since the bottom cover covers the entire can bottom in particular, the outer covering of the can bottom can be complimented.

  Different processing strokes are carried out on a rotating pan, but it is relatively inexpensive based on synchronized delivery and holding delivery elements that match the can diameter. The required transport output is preferably achieved by the solution, which is provided with a plurality of parallel straight machining lines. Stagnation areas are provided in front of the individual processing stations, and cans partially assembled from the stagnation areas are guided to parallel processing lines. When production is switched from a can with the first diameter to a can with the second diameter, only a few elements must be adapted to the changed diameter in the parallel straight line.

  It is possible to produce a can with a very thin can mantle by the process of the present invention. To manufacture the can mantle, a steel sheet with a thickness of merely 0.16 mm can be used. In some cases, thin plates with thicknesses of 0.16 and 0.12 mm may be used.

  In the can body according to the present invention, which includes a can jacket closed around the can axis and including a metal layer, and a closure (lid) member including the metal layer, the overlapping region between the closure (lid) member and the can jacket A leather joint between the metal layer of the can shell and the closure member is formed along the joint line. The leather joint includes a number of interruptions along the bond line or a number of narrowly confined areas in which both metal layers are welded together. A synthetic resin material is disposed at the leather joint. The leather joint ensures stability and the synthetic resin material ensures the tightness of the joint between the can shell and the closure.

  In the inventive method of manufacturing the can body of the present invention, a leather joint is formed between the metal layers of the can mantle and the closure member with multiple interruptions along the bond line or with multiple narrowly defined areas. In these regions, both metal layers are welded together. In the leather joint, a synthetic resin material is arranged, the leather joint ensures stability and the synthetic resin material guarantees sealing. The area where the two metal layers are welded together is processed in particular by means of a laser scanning device, and the laser light is guided, for example, via a mirror movement along the bond line or along the overlap area and emitted alternately, Or because it is interrupted, coupling and interruption occur.

  The inventive method of manufacturing the can body of the present invention includes a razor welding device and a holding device that holds the can mantle and the closure member, the razor welding device having a number of narrow and confined areas in the overlap region. Includes a scanning laser apparatus in which both metal layers are welded together by a scanning laser beam. The scanning laser apparatus includes a control unit, a laser source for preparing a scanning laser beam for a desired time portion, and at least two mirrors or reflecting surfaces that can be rotated about axes that are perpendicular to each other. A desired position is reached in each of the overlapping regions from the leather source via both rotatable mirrors or reflecting surfaces, and the holding device holds the can mantle and the closing member in place.

  The drawings illustrate the solution of the invention on the basis of an embodiment.

The longitudinal cross section which passes along the coupling | bond part of a can mantle and an upper closure member is shown. The longitudinal cross section which passes along the coupling | bond part of a can mantle and an upper closure member is shown. The longitudinal cross section which passes along the coupling | bond part of a can mantle and an upper closure member is shown. The cross section of the top view regarding the coupling | bond part of a can mantle and an upper closing member is shown. 1 shows a schematic representation of a device for joining a can shell and an upper closure member. Fig. 3 shows a schematic representation of a scanning leather device during the formation of a circular leather joint. The longitudinal cross section which passes along the cross section of the joint part of a can wall and a can bottom is shown. The top view regarding the cross section of the connection part of a can wall and a can bottom is shown. The longitudinal section which passes along a can mantle and a can bottom at the time of insertion of a can bottom is shown. The longitudinal section which passes along a can mantle and a can bottom at the time of insertion of a can bottom is shown. The longitudinal section which passes along a can mantle and a can bottom at the time of insertion of a can bottom is shown. Fig. 2 shows a schematic plan view through a can mantle and a can bottom when the can bottom is inserted. Fig. 2 shows a schematic plan view through a can mantle and a can bottom when the can bottom is inserted. Fig. 2 shows a schematic plan view through a can mantle and a can bottom when the can bottom is inserted. The front view of the can mantle which formed the leather joint from the flat board is shown. Fig. 5 shows a side view of a can mantle with a leather bond formed from a flat plate. Fig. 3 shows an enlarged cross section of a longitudinal section through a leather joint of a can jacket. Fig. 3 shows an enlarged cross section of a longitudinal section through a leather joint of a can jacket. The longitudinal cross section which passes along the cross section of the joint part of a can bottom and a can wall is shown. The longitudinal cross section which passes along the cross section of the joint part of a can bottom and a can wall is shown. The left and right embodiments are illustrated, showing a longitudinal section through the drinking water can where the lengths of the can mantle and the closure member are different in the overlap region.

  FIGS. 1 a, 1 b, 1 c and 1 d show the narrowed upper end of the can jacket 3 with respect to the neck member 4, which is held by a holding device not shown. An inner foil 3b is arranged on the inner surface of the can outer jacket 3, and an outer foil 30 or an outer coating is arranged on the outer surface. From the bottom, the holding core 34 lifts the upper closing member 33 against the upper opening of the can outer casing 3. The upper closing member 33 includes a valve seat 5 including an inner edge bent portion 6 and a packing ring 7 inserted into the inner edge bent portion 6. In order to ensure that the upper closing member 33 is accurately positioned and pressed against the neck member 4, the holding core 34 includes a centering protrusion 34a and a pressing surface 34b. The upper closing member 33 is pressed from the pressing surface 34 b to the corresponding surface of the neck member 4 by the overlapping region 33 a adapted to the narrow portion of the can outer casing 3.

  An upper pressing ring 36 is attached to the neck member 4 from above in order to connect the upper closing member 33 firmly and airtightly to the cannula 3. The heating device 36a is formed and arranged so that heat can be guided from the synthetic resin material 7a to the outer bonding region 35b, and a heat seal bond is formed between the upper bonding region 35b of the synthetic resin material 7a and the inner foil 3b. Has been. When the synthetic resin material 7a is formed as a single member with the packing ring 7, a continuous inner coating from the inner foil 3b to the packing ring 7 occurs.

  The metal layer of the cannula 3 is joined to the metal layer of the upper closing member 33 in the overlapping region 33 a by the scanning laser beam 37. The resulting razor bond includes a number of narrowly defined bond points in the overlap region 33a, where the razor beam welds the two metal layers together. The material of the inner foil 3b moves from the center of the laser beam to the outside during the application of the laser energy spot, and the two metal layers are welded to each other in a bolt shape without obstruction and bonded together via a solidified weld region 39. Has been. The time and output of the laser beam form a connection point, and the welding region 39 is selected so that it is not completely affected by the metal layer of the upper closing member 33 and the synthetic resin layer 7a. Different grids and possibly different cross-section connection points are possible and at least one row is required along the periphery. By controlling the scanning laser, the arrangement and shape of the coupling areas or coupling points can be changed with little expense.

  FIG. 2 shows an embodiment of an apparatus for joining a can mantle and a closure member. In the circulating chain or belt device 40, the protruding holding core 34 is fixed by the centering protrusion 34 a and the pressing surface 34 b, and a plurality of rows of holding cores 34 can be arranged. The upper closing member 33 is provided. The upper closing member 33 is placed on the holding core 34 in the first stacking area 42. In the second loading area 43, the can outer casing 3 is placed on the holding core 34 via the upper closing member 33.

  The upper pressing ring 36 is attached to the neck member 4 of the can outer jacket 3 from above, and a sealing joint portion is obtained from the joining region 35b of the synthetic resin material 7a to the inner foil of the can outer jacket 3 by a heating device. Subsequently, the metal layer of the can jacket 3 is joined to the metal layer of the upper closing member 33 by the scanning laser beam 37. Since the can member is not rotated or the leather source is not moved in a circle, the leather coupling equipment can be easily configured. In the delivery area 45, the cannula 3 is delivered by the upper closing member 33 so as to be transported to another can processing station.

  FIG. 3 shows a scanning razor device 46, which forms a razor bond with a number of narrowly confined areas along a circle by means of a scanning razor beam 37, which welds the two metal layers together. It was done. In the illustrated processing step, the can bottom 13 is pressed from the inside to the lower narrow portion of the can outer casing 3 and fixed by leather bonding. Inside the can, the holding core 34 ′ presses the can bottom 13 against the narrow portion of the can outer casing 3, and the can outer casing 3 is held against the can bottom 13 by the pressing ring 36.

  The scanning laser beam 37 reaches a toric region through two mirrors 47 or reflecting surfaces that can rotate about axes that stand perpendicular to each other from a light source (not shown), and a laser coupling is formed in this region. A control unit (not shown) and the two driving units 48 operate the rotational alignment of both mirrors 47.

  It is self-evident that another closing element is secured to the cannula 3 instead of the can bottom by means of the scanning razor device 46. For this purpose, the closure element can be arranged on the can jacket on the front and outside. This solution is not limited to aerosol cans and, of course, is not limited to special aerosol cans with inner edge folds.

  FIGS. 4 a and 4 b show a razor joint formed by the scanning razor device 46. This included a number of narrowly defined bond points 38 in the overlapping region of the interconnected members, where the laser beam welded the two metal layers together. The material of the inner foil 3b moves from the center of the laser beam to the outside during the application of a point of the leather energy, and both metal layers are connected to each other via a bolted welded and solidified weld region 39 without any obstacles. It has been shown that. Various grid connection points are possible, and at least one row is required along the periphery. The arrangement and shape of the coupling areas or coupling points can be changed with little expense via the scanning laser control.

  The can jacket 3 is narrowed to a shoulder shape at the can bottom 13. The can bottom 13 has a correspondingly formed overlap region that is tightly welded to the leather joint in the narrowed region of the can shell 3. Inside the can, the synthetic resin material 15 is disposed along the circular leather joint portion, and is hermetically joined to the can bottom 13 along the lower joint region 15a, and the can outer shell 3 along the outer joint region 15b. Airtightly coupled. The synthetic resin material 15 can be placed on the can bottom 13 as a ring or a dish having a ring edge, and is injected into the can bottom 13 by a nozzle or in an injection stroke. If the center cover area | region of the synthetic resin material 15 covers the intermediate | middle area | region of the can bottom 13, the can 1 can be manufactured for few expenses, and the whole inner surface of a can has a synthetic resin layer.

  The lower end region of the can jacket 3 is in airtight contact with the shoulder-like overlapping region in the stroke of the can bottom 13. The front of the periphery of the can bottom 13 is located inside or inside the can, and the lower end region of the can jacket 3 is located outside the can bottom 13.

  FIGS. 5 a, 5 b and 5 c and 6 a, 6 b and 6 c show the insertion of the can bottom 13 through the narrowed end region of the can jacket 3. When the can shell 3 is slightly narrowed in the end region where the can bottom 13 is disposed, the can shell 3 has an outer diameter slightly larger than the through opening of the region where the can bottom 13 is narrowed.

  In FIGS. 5b and 6b, the cross section of the can shell 3 has been transformed into an elliptical cross section by a slight pressure or squeezing machine. In this case, the opening cross section expands in the first direction and contracts in the second direction standing perpendicular to the first direction. The can bottom 13 is held from the insertion holder 49, and a negative pressure is generated particularly in the suction contact area to be held. During insertion, the can bottom 13 is inclined about an axis extending substantially parallel to the first direction from the insertion holder 49 to the plane of the elliptical opening. In the inclined position, the can bottom 13 is inserted into the can jacket 3.

  FIGS. 5 c and 6 c show the situation after the cantilever 13 is tilted back by vertical alignment of the insert holder 49. After removing the insertion holder 49, the can bottom 13 is pressed into the narrow portion from the inside, and the upper front surface of the holding core 34 'is pressed against the can bottom. In the overlapping region, the can bottom 13 is fixed to the can jacket 3 by a leather joint.

  Independently of the invention claimed in the independent claims, the novel and inventive leather joint comprises a large number of narrowly confined areas in which the laser beam is welded to both metal layers, It cannot be preferably inserted when the closure element is connected. Based on FIGS. 7a, 7b and 8a, 8b, a can shell 3 is described which is manufactured from a flat plate by means of a leather joint. The flat plates are transformed into a single can, with the lateral regions attached to each other abutting each other with a slight overlap along the razor joint in the overlap region 50.

  In a lateral region in close contact with each other by leather, a leather coupling portion 51 is formed, and this coupling portion comprises a large number of narrowly defined coupling regions. In this case, the can jacket 3 is moved relative to the leather outflow location, or the outflow location of the scanning laser beam 37 is moved along the overlapping region 50.

  When the inner space of the cannula 3 does not need to be completely separated from the metal layer of the cannula 3, the connection according to FIG. 8a is sufficient, where the front face located inside the cannula layer is close to the can interior it can.

  In order to guarantee a complete inner coating, the metal layer of the flat plate for the can outer shell 3 is provided with an inner foil 3b or a synthetic resin coating, and a synthetic resin frame is placed on the first front surface to be located inside the can outer shell 3. 52 is arranged. The first coupling surface 52a of the synthetic resin frame 52 is coupled directly to the inner foil 3b or the coating on the first front surface through an adhesion or seal coupling portion. After the can outer casing 3 is formed, the second bonding surface 52b of the synthetic resin frame 52 contacts the inner foil 3b in the vicinity of the second front surface of the metal layer of the flat plate. The second coupling surface 52b is also hermetically coupled to the inner foil 3b or the coating by the sealing or adhesion coupling portion. A can jacket provided with this joint is preferably used in the manufacture of any three-member can. A three-member can with a can mantle with a leather longitudinal joint 51 with a number of narrowly defined joint areas and an internal foil 3b or a synthetic resin frame 52 airtightly joined with a coating is easily manufactured with higher quality. obtain.

  FIG. 9 a shows a razor joint produced by a scanning razor device 46 between the can shell 3 and the can bottom 13. This includes a large number of narrowly defined connection points 38 in the overlapping region of the members 3, 13 connected to each other, where the laser beam causes the can shell 3 and the metal layer of the closure member or can bottom 13 to join each other. Welded.

  The overlap region 53 is closed in a ring shape and cans at an angle in the range of 5 ° and 85 °, especially in the range of 20 ° to 70 °, preferably in the range of 30 ° to 60 °, in the cutting plane containing the can axis 2. It extends with respect to the axis 2. As a result, close contact between the members to be coupled can be obtained in the overlapping region 53 by the pressing force acting between the two members. In this cutting plane, the can outer casing 3 extends to one end of the can outer casing 3 in an overlapping region 53 from one side surface to the front surface 3c. The outer edge region of the closure member extends to the overlap region 53 from the other side to the closure member or bottom 13 radial outer front 13c. Since the can jacket 3 and the closing member have substantially the same shape in the overlapping region 53, they contact each other without any gap. In the illustrated embodiment, both members only have a position that is an overlapping region.

  The synthetic resin material required for sealing the leather joint is formed by the outer cover 54 of the can bottom 13. Since the outer coating 54 is closely bonded to the can bottom 13 and the can jacket 3 at the overlapping region or the leather joint portion, the overlapping region is particularly subjected to heat treatment. In order to ensure a stable and airtight connection of the outer covering 54 to the can shell 3, the outer covering 54 includes a sealing layer connectable to the can outer shell 3 at least in the overlap region, and the bonding of the outer covering 54 to the can bottom 13. The part is likewise a tight and airtight joint. The outer coating 54 provides corrosion protection at the can bottom 13, which is preferred for steel cans, because the outer coating does not rust even on wet surfaces.

  The material of the outer coating 54 moves out of the center of the laser beam during the point application of the laser energy, and both metal layers are welded to each other in a bolt-like manner without obstruction and bonded together via a solidified weld zone 39. It was shown that. Around the solidified weld area 39, the outer coating 54 remains present as a sealing layer circulating along the overlapping area 53 to obtain the desired sealing function. Various grid connection points 38 are possible, and at least one row is required along the periphery. The arrangement and shape of the coupling areas or coupling points 38 can be changed with little expense via the scanning laser control.

  In the embodiment illustrated in FIG. 9a, neither the can bottom 13 nor the closure member nor the can outer shell 3 is coated on the inner surface of the can. Such a can without an inner coating can be used for any product where an unwanted reaction between the metal element of the closure element or can wall 3 and the product is not desired, such as for polyurethane foam for structural applications. Is the case.

  The embodiment shown in FIG. 9 a of the razor joint may be selected similar to the upper closure member, with the upper closure member or possibly the cannula 3 having a synthetic resin coating at least in the overlapping region 53.

  FIG. 9b shows an embodiment of the joint between the can shell 3 and the closure member, in particular the bottom 13, in which the external front face 13c of the internal position member is not accessible from the inside of the can because the radially outer This is because the edge region of the front surface 13c is bent around 180 °. The folded edge region is in contact with the other member in the overlap region 53 so that the front face 13c is no longer accessible after the formation of the razor joint or joint point 38. When the can shell 3 includes the inner foil 3b and the closing member or can bottom 13 includes the covering 13d, the continuous inner covering of the inner foil 3b and the inner covering 13d and the synthetic resin material form a sealing property. It was obvious that when the closure member was brought into contact with the can outer shell 3 on the outside, the end region of the can outer cover could be bent correspondingly.

  FIG. 10 shows an embodiment in the form of a drinking water can 55 in which the can bottom is formed as a cup-like member deeply drawn together with the can shell 3. An upper closing member 56 having an opening device 57 is disposed at the upper opening end of the can outer casing 3. The leather joint between the can shell 3 and the upper closure member 56 includes a number of narrowed joint points 38 at which the laser beam welds the metal layers of the can shell 3 and the upper closure member 56 together. did.

  In the overlap region 53, there are two possibilities when the can shell 3 and the upper closing member 56 merge. Similar to the method illustrated on the basis of FIGS. 5a, 5b and 5c, the upper closure member 56 is brought into contact with the cannula 3 from the inside of the can to the overlap region 53 (left side), and the pressing pressure can be achieved by means of an insertion holder. Since the inside of the can cannot be accessed at the bottom of the can in order to enable pressing from the inside, the insertion holder must be coupled to the upper closing member 56 via a negative pressure or a clamping device. The second possibility of merging is that the upper closure member 56 is brought into contact with the cannula 3 from the outside of the can to the overlapping region 53 (right side), and both members to be joined can be pressed together from the outside. In both aspects, the can jacket 3 and the upper closure member 56 are formed in an overlapping region so that the outer contour matches the desired drinking water can shape.

  According to the embodiment shown on the left, the synthetic resin material required for sealing at the leather joint portion is formed by the inner coating or inner foil 3b of the can outer shell 3, and the inner foil 3b or inner coating is the can outer shell 3 And the upper closure member 56 is located in the overlapping region. Since the inner foil 3b or the inner coating is intimately bonded to the upper closing member 56 and the can outer casing 3 in the overlapping region or in the leather connecting portion, the overlapping region is particularly subjected to heat treatment. In particular, the inner foil 3b or the inner coating includes a sealing layer facing the upper closing member 56 in the overlapping region.

  According to the embodiment shown on the right, the synthetic resin material required for sealing at the leather joint is formed by the inner covering 58 or the inner foil of the upper closing member 56, and the inner covering 58 or the inner foil is formed by the can outer cover. 3 and the upper closure member 56. Since the upper covering member 56 and the can outer casing 3 are intimately connected to each other in the overlapping region of the inner coating 58 or at the leather connecting portion, the overlapping region is particularly subjected to heat treatment. In particular, the inner coating includes a sealing layer facing the can shell 3 in the overlapping region 53.

  When the leather energy is applied in the form of dots, the inner foil 3b or the inner coating 58 moves from the center of the laser beam to the outside, and the two metal layers are joined together through a welded region 39 solidified into a bolt shape without obstruction. . The inner foil 3b or the inner coating 58 forms a packing that is continuous in the peripheral direction in the overlapping region. It can be obtained or enhanced in a similar manner to the embodiment according to FIGS. 1c and 4a by means of a synthetic resin material which is arranged on the inner surface of the can, optionally additionally on the inner surface of the can and bonded to the inner foil 3b and the inner coating 58.

  In the case of a member provided with at least one of an inner coating and an inner foil, one of two members joined to each other is prevented in order to prevent the metal layer of the can shell 3 or the upper closing member 56 from being freely located inside the can. The front face located on the inner foil is covered. Correspondingly, the left outer surface is covered with the radially outer front surface of the upper closing member 56. In the embodiment according to the right side, the end face 3 c is covered at the free end of the can shell 3.

1. . . . . Can body . . . . Can axis line . . . . Can jacket 3b, 7a, 13d, 15, 54, 58. . . 4. Synthetic resin material, internal foil . . . . Valve seat 13, 33, 56. . . Closing member 38. . . . . Bonding point 53. . . . . Overlapping areas 54, 58. . . Coating 57. . . . . Opening device

Claims (14)

  A can jacket (3) including a metal layer and closed about a can axis (2), and a closing member (13, 33, 56) including the metal layer, the closing member (13, 33, 56) and a can jacket (3) in the overlapping region (53), a leather joint is formed between the metal layer of the can shell (3) and the closure member (13, 33, 56) along the bond line. In the can body (1), the leather joint has a number of interruptions along the bond line or a number of narrowly restricted areas where the two metal layers are welded together, and the synthetic resin material (3b, 7a, 13d, 15 , 54, 58) are arranged in the leather joint, the leather joint guarantees stability, and the synthetic resin material (3b, 7a, 13d, 15, 54, 58) guarantees sealing performance Can body.   Can according to claim 1, characterized in that the area where the two metal layers are welded to each other is formed as a narrow and limited metal connection point (38).   Can body (1) according to claim 2, characterized in that the connection points (38) form at least one line along the connection line, but are arranged in particular in a grid.   The closing member (13, 33, 56) is an upper closing member (33, 56), in particular with a valve seat (5) and possibly with an opening means (57) for a drinking water can. Can body (1) according to any one of claims 1 to 3, characterized in that it is characterized in that   Can body (1) according to any one of claims 1 to 3, characterized in that the closing member (13, 33, 56) is a can bottom (13).   The synthetic resin material (3b, 13d, 54, 58) is arranged in the form of a coating (54, 58) or foil (3b, 13d) at least on the closing member (13, 33, 56) or the can mantle (3) in the overlapping region. The can (1) according to any one of the preceding claims, characterized in that it is located between two bonded metal layers.   An inner foil (3b) is arranged on the inner surface of the can outer shell (3), and the material of the inner foil (3b) is located between the two metal layers in the region where the two metal layers are welded to each other. A can body according to any one of claims 1 to 6, characterized in that a welded area (39) in which both metal layers are solidified is formed by pushing it to an appropriate place by applying a shape. 1).   Inside the can, synthetic resin materials (3b, 7a, 13d, 15, 54, 58) are arranged along all the leather joints, and are in close contact with the closing member (13, 33, 56) and the can mantle (3). The can (1) according to any one of claims 1 to 7, characterized in that the can (1) is coupled to the can.   Can according to claim 8, characterized in that the synthetic resin material (15) is arranged on the can bottom (13) in the form of a ring or dish and is joined to the can mantle (3) radially outwardly. Body (1).   A can jacket (3) including a metal layer and closed about a can axis (2), and a closing member (13, 33, 56) including the metal layer, the closing member (13, 33, 56) and a can jacket (3) in the overlapping region (53), a leather joint is formed between the metal layer of the can shell (3) and the closure member (13, 33, 56) along the bond line. In the method of manufacturing the can (1), the leather joint is formed with many interruptions along the bond line, or with a number of narrowly confined areas where the two metal layers are welded together. The synthetic resin material (3b, 7a, 13d, 15, 54, 58) is disposed in the leather joint portion, and the leather joint portion ensures stability, and the synthetic resin material (3b, 7a, 13d, 15, 54, 58) guaranteeing sealing properties.   11. The region according to claim 10, characterized in that the areas where the two metal layers are welded to one another are arranged in a particularly grid pattern along the bond lines in at least one row as narrowly defined metal bond points (38). A method for producing a can (1).   The areas where the two metal layers are welded to each other are formed by a laser scanning device, and the laser light is guided, for example, via a mirror movement along the bond line or along the overlap area (53) and alternately. 12. A method for manufacturing a can (1) according to claim 10 or 11, characterized in that the coupling and the interruption occur because of irradiation or interruption.   A can jacket (3) including a metal layer and closed about a can axis, a closing member (13, 33, 56) including a metal layer, a closing member (13, 33, 56), and a can jacket ( 3) in the overlap region (53) of 3), the device comprises a leather joint formed along the bond line between the metal layer of the can mantle (3) and the closure member (13, 33, 56). In an apparatus for manufacturing a can body (1) including a welding apparatus and a can jacket (3) and a holding apparatus for holding a closing member (13, 33, 56), the leather welding apparatus is limited to a large number of narrowly. A device for manufacturing a can (1), characterized in that the overlapping region in the region includes a scanning laser device (46) for welding the two metal layers together by means of a scanning laser beam (37).   The scanning laser device (46) comprises a control unit, a laser source for preparing a scanning laser beam (37) for a desired time portion, and at least two mirrors (47) or reflections rotatable about axes perpendicular to each other. The scanning laser beam (37) from the laser source via two rotatable mirrors (47) or reflecting surfaces to reach the desired location in the overlap area, and the holding device is a can mantle (3). A device for manufacturing a can (1) according to claim 13, characterized in that the closure member (13, 33, 56) is held in one fixed position.

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