ES2325638T3 - PLATE BOAT AND PROCEDURE FOR THE MANUFACTURE OF THE SAME. - Google Patents

Abstract

The tin can has an axial welded joint, a central cylindrical section (4), and a conical opening section (8) sealable by a cover, which is made of foil material. A reinforcing seam (9) reinforces the conical opening section, and is formed in a circumferential direction between the opening section and the cylindrical section. The reinforcing seam protrudes inwardly to a longitudinal axis of the tin can, and has a radius of curvature between 1 millimeter and 3 millimeters. An independent claim is also included for a method for manufacturing a tin can.

Description

Tin boat and procedure for manufacture of it.

The present invention relates to a boat of sheet according to the preamble of claim 1. The invention is also refers to a procedure for the manufacture of a boat of sheet metal of this class according to the preamble of the claim 8.

A cylindrical sheet boat with a ring support made in the mouth that supports a removable lid is of general knowledge. The support ring of this sheet metal boat known presents a section that protrudes from the surface inner peripheral of the sheet metal boat and extends in the direction perpendicular to the longitudinal axis of the sheet boat. This section It forms a seating surface for the placement of the lid. He support ring is attached with the metal canister at the end upper section of the mouth by beading this extreme. Due to the support ring it is difficult to empty the boat. When you dump the boat to empty its contents, the section of the ring support protruding inwards prevents emptying Simple and comfortable for the user. Depending on the properties of creep of the product housed in the tin boat, the user Sometimes you have to insert your finger to empty the boat. Because the support ring is formed of a sheet material In this case, cut injuries may occur.

To solve the problems attached to this state already known in the art has been proposed with EP 0 700 838 B1 a tin boat according to the preamble of claim 1 and a procedure for its manufacture according to the preamble of claim 8. This state of the art proposes to perform the boat with a central cylindrical section, a conical section of the mouth, a contraction between the conical section of the mouth and the section central cylindrical The cylindrical contraction is joined by its anterior end to the conical section of the mouth of the generic canister. On the inner peripheral surface of the conical section of the mouth is seal the lid to close the canister. The upper end of the section central cylindrical continues following the contraction through of a section of smaller diameter.

While with this well-known sheet metal boat simplifies emptying and avoids the risk of injury, however the conical section of the mouth tends to deform when detaching the top. In particular, it is the conical section of the mouth that is dragged along the conical section of the edge of the lid until the force applied by the consumer to detach the lid from breaking the union between the conical section of the mouth and the conical section of the edge. A conical section of the mouth deformed in this way however hinders the controlled emptying of the tin boat.

Starting from the state of the art, the objective of the present invention is to provide a tin boat that allow a controlled and comfortable emptying for the user. Other objective of the present invention is to facilitate a procedure for the manufacture of a tin boat of this class.

The aspect of the present invention relating to the devices are solved by means of a tin boat according to claim 1, characterized in that it has a means to give rigidity to the conical section of the mouth. The medium is made by example mainly in a way that avoids deformation of the section conical of the mouth due to a tensile stress acting on the conical section of the mouth.

In accordance with the present invention, the medium it is made in peripheral direction between the conical section of the mouth and the central cylindrical section, in the form of a molding of reinforcement. The reinforcement molding runs for example along of the entire perimeter of the sheet metal boat. The reinforcement molding is made for example as a reinforcement molding that stands out radially outward from the outer perimeter of the boat of sheet metal, which exceeds the outer peripheral surface of the section central cylindrical Reinforcement molding, seen in a section longitudinal, for example has an essentially triangular, preferably with rounded edges or transitions. From WO 2004 108 3066 a sheet metal canister is known whose mouth section is cylindrical with a reinforcement molding.

According to the invention, the molding of reinforcement protrudes inwards towards the longitudinal axis of the tin boat and has a radius of curvature between 1 mm up to 3 mm The reinforcement molding is therefore made according to the invention as a reinforcing molding domed towards the inside that protrudes radially from the peripheral surface inside of the tin boat. In this way it is not only resolved the problem that constitutes the basis of the invention, due to the fact that deformation of the conical section of the mouth is effectively avoided but also that the product to be emptied from the tin can it is not retained in the tin boat due to the molding of reinforcement. Therefore there is no risk that for example a powder product stored in the tin canister is retained due to the reinforcement molding when emptying the tin boat. Of this mode it is always possible to carry out a controlled and comfortable emptying for the user.

According to another embodiment preferably the reinforcement molding continues with its first end directly after the conical section of the mouth, and joins by its second end directly to the central cylindrical section. The reinforcement molding is therefore located directly on the immediate vicinity of the conical section of the mouth, which is achieved a reinforcement of the entire conical section of the mouth. This provision of the reinforcement molding in the vicinity of the conical section of the mouth and the central cylindrical section also results in a more compact sheet boat structure.

The transition from the first end to the section conical of the mouth and the second end to the central cylindrical section preferably each one has a radius of curvature between 0.8 mm and 1.6 mm. The inner peripheral surface of the section upper cylindrical above the domed reinforcement molding protruding towards the conical section of the mouth is thus performed continuously, that is to say that there is no elbow or no other discontinuity along the peripheral surface interior made in the tin boat that could retain the product stored in the tin boat.

According to another embodiment preferred, the lid has a circular base surface and a section tapered edge, and the outer peripheral surface of the section of the edge sits completely on the inner peripheral surface of the conical section of the mouth, inserting a sealing layer of thermoplastic material The diameter of the circular base surface preferably corresponds essentially to the diameter of the central cylindrical section or the lower end of the conical section of mouth. The length of the conical edge section corresponds preferably to the length of the conical section of the mouth. The stretch preformed tapered edge of the lid runs parallel to the inner conical peripheral surface of the mouth section. At sense of the invention "completely" does not only mean that the length of the conical edge section coincides with the length of the conical area of the mouth, so that the conical section of the edge can sit completely in the mouth section, but also the conical section of the edge sits smooth, that is to say without bubbles of air, along the entire inner peripheral surface of the conical section of the mouth. The material sealing layer Thermoplastic is preferably formed from polyethylene. This preferred embodiment allows a use Optimum material and facilitates excellent tight sealing.

According to an embodiment Especially preferred, the conical edge section and the section conical of the mouth are thrown outward each one a angle of 8º to 12º in relation to the longitudinal axis of the boat lock. Since considering the longitudinal section of the boat veneers the angle between the edge section and the longitudinal axis of the tin boat and between the conical section of the mouth and the shaft longitudinal of the tin boat is between 8º and 12º, it achieves an especially good adhesion between the edge section and the conical section of the mouth. Through this angle you can also favors the insertion and application of the cover in the conical section of mouth.

According to another embodiment preferred according to the present invention, has been realized to facilitate the detachment of the cover of the conical section of the mouth a detachment tongue formed in the conical section of the edge, which allows the detachment of the lid. The tongue of detachment preferably part of the outer edge of the section tapered edge. Since the sheet can according to this invention presents means to reinforce the conical section of the mouth, the detachment tongue can therefore be formed in the conical edge of the edge without fear of deformation of the conical section of the mouth of the tin boat when the lid is detached. He means to reinforce the conical section of the mouth therefore presents  also the advantage that the detachment tongue can be perform comfortably for the user directly on the stretch tapered from the edge of the lid instead of on the surface circular base of the lid that covers the mouth of the tin boat.

According to another embodiment preferred, the detachment tongue is formed of the same piece with the conical section of the edge by means of a cut of the sheet material, and is folded in such a way that a first section of the detachment tongue extends parallel to the section tapered edge and a second section of the tongue of detachment extends parallel to the circular base surface. Due to the realization of the cover and the tongue of detachment in one piece there is optimal use of material. Since the detachment tab is bent from such that it essentially follows the shape of the conical section of the edge and circular base surface, is formed in this way also a compact preferred arrangement of the tongue of detachment The detachment tongue is bent preferably so that the respective first and second tranches they sit on the conical section of the edge and on the base surface circular. When opening the lid the user only lifts the tongue of detachment, and this previously adopts a compact position that saves space, immediately attached, preferably settling on the upper face of the lid.

The problem under the procedure is resolves according to the present invention by a process according to claim 8. The conical section of the mouth is shaped preferably by conification to obtain the conical section of the mouth with a predetermined angle between the conical section of the mouth and the longitudinal axis of the tin boat. The stretch of the mouth is  preferably bends so that its front end exceeds the Surrounding surface of the central cylindrical section. By means of the conification a conical section of the mouth is formed by means of shaped, whose diameter is constantly increasing towards its front end The smallest diameter of the conical section of the mouth is therefore formed at its lower end. The middle intended to reinforce the conical section of the mouth is achieved by example by applying reinforcement elements in the outer perimeter of the tin boat.

According to the invention, the medium without however it is formed by forming the sheet material of the boat between the conical section of the mouth and the cylindrical section central, in the form of a reinforcement molding. This molding of reinforcement is preferably performed all along the perimeter of the sheet metal blank. According to the invention, the sheet metal blank is pressed inwards between the section conical of the mouth and the central cylindrical section towards the axis longitudinal of the sheet metal blank so that it conforms the reinforcement molding with a radius of curvature between 1 mm and 3 mm. By forming to form the reinforcement molding no only the conical section of the mouth is prevented from deforming peel off the lid but also that during the machining phases back of the sheet metal blank, for example when applying the lid or when filling the tin boat, the conical section of the mouth is not misshapen.

An especially preferred embodiment of the present invention is characterized by being trimmed the cover with a detachment tongue made from sheet and by forming the lid to form a surface circular base and a conical edge section, where at least the area of the sheet material that forms the conical edge section is covered with a sealing layer of thermoplastic material. He sheet material is preferably an aluminum sheet of the one that is cut the lid. With a view to optimization of resources, the one-piece lid is trimmed along with the detachment tongue. The cropped lid conforms to this by means of a tool provided for this purpose in such a way that it forms the conical section of the edge along the entire perimeter of the basic circular surface, extending the tongue of detachment from a partial area of the edge section. The layer sealing is preferably formed by a layer of polyethylene and is preferably applied along the entire surface inner peripheral of the conical edge section. The lid conforms preferably in such a way that the diameter of the basic surface circular essentially corresponds to the diameter in the lower end of the conical section of the mouth. The length of the section tapered edge preferably corresponds to the length of the conical section of the mouth. By preforming the lid, you can get an exact fit between the conical section of the mouth and the conical edge of the edge, which ensures a union reliable between the conical section of the mouth and the conical section of the edge. After the cover has been shaped, the tongue of detachment preferably protrudes from the edge of the section conical edge, in the longitudinal direction of it.

According to an embodiment preferred, the step of forming the lid includes the drawing deep in the lid to form the circular base surface and the conical edge section, such that the conical edge section is  make smooth. Deep drawing is done through a conical tool with which the lid conforms securely and With the exact form. In particular the lid is shaped in such a way that the conical section of the edge is smooth or without folds, that is to say that correspond strictly to the outer peripheral surface of a cone trunk. Through the pre-shaped lid in this way it is ensured that the conical section of the edge seats in conditions  optimal in the conical section of the mouth, interspersing the layer of sealing material The appearance of air bubbles and therefore the weakening of the seal that It's about getting.

According to an embodiment of the present invention especially preferred the process is characterized by the fastening of the cover formed by a heated punch, which heats the layer of sealing material thermoplastic when carrying the cover conformed to the sheet metal blank  welded, insert the shaped cover into the conical section of the mouth of the welded sheet metal part, apply the conical section from the edge to the conical inner peripheral surface of the section conical of the mouth such that the conical section of the edge seats completely on the conical inner peripheral surface intercalating the layer of thermoplastic sealing material that has been heated, and hermetically sealing the conical section of the mouth of the welded sheet blank, which gives the Tin canister sealed with the lid. The shaped cover is sucked preferably by vacuum against the punch and carried to the sheet metal blank. The punch is preferably heated from permanent mode to heat and melt the material layer of thermoplastic sealing. The lid with the heated sealing layer is then enter the conical section of the mouth and the conical section of the edge sits against the inner peripheral surface of the conical section of the mouth inserting the layer of sealing material heated thermoplastic in order to hermetically seal the mouth. In particular, the conical edge section is compressed by a predetermined force against the inner peripheral surface of the conical edge of the edge, in order to obtain a uniform distribution of the layer of sealing material between the inner peripheral surface of the conical section of the mouth and the inner peripheral surface of the conical edge section.

Since the lid is already preconformed with the smooth tapered edge of the edge, the lid can be inserted and applied Quickly and safely. By combining the preform of the edge section to obtain a smooth edge section without folds and full settlement of the conical edge section against the conical section of the mouth it is obtained in particular in a Very short time a stable and safe seal. For this, the molding of reinforcement contributes to the fact that the conical section of the mouth is not deformed during machining of the sheet metal blank. For this motive is guaranteed that the conical edge section preformed can sit completely in the conical section of the mouth. No further adjustment of the conical section of the edge. In comparison with EP 0 700 838 B1, it is achieved considerable time savings by introducing the preformed lid with a tapered edge section. In the state generic of the technique it is necessary to first introduce a cover in hat shape, so that its outer edge is attached to the make contact with the inner peripheral surface of the section conical of the mouth and nods in it. This consumes time and brings I get the inconvenience that the cover cannot be applied with sufficient precision in the conical section of the mouth. For this reason you can't get any generic procedure complete settlement of the section of the edge of the lid against the inner peripheral surface of the conical section of the mouth. For the As much as there is a danger of the lid coming off the tin boat. In addition, the generic procedure must first introduce the cover and seat it against the inner peripheral surface of the section conical of the mouth before the layer of material can be heated sealant For that reason the productivity of this procedure known is reduced. In addition, folds can form in the section from the edge of the lid since it has not been preconformed. At generic state of the art there is also the risk that due to the absence of a reinforcement molding the section is deformed conical of the mouth during the completion of the tin boat. This increases the risk that the section of the edge of the lid does not seats completely on the inner peripheral surface of the conical section of the mouth.

According to another embodiment preferred the cover is inserted such that the bottom edge of the conical edge of the edge is located in the transition zone of the first end of the reinforcement molding to the conical section of the mouth. The lower edge of the conical section of the edge of the lid is applies therefore directly in the transition of the first end of the reinforcement molding with the conical section of the mouth. The reinforcement molding radially inwardly forms the smallest diameter of the tin boat and prevents the lid from insert too deep inside the sheet metal boat along its longitudinal axis. Reinforcement molding contributes to an exact and safe positioning of the lid. With this is guaranteed that the conical section of the edge of the lid seat fully and in exact position on the peripheral surface inside the conical section of the mouth.

According to another embodiment preferred according to the present invention the punch applies the stretch tapered from the edge to the coldest inner peripheral surface of the section of the mouth, and withdraws before the sheet has reached the melting temperature of the sealing layer. Through the heating of the sealing layer during handover is guaranteed that the punch applies the lid securely to the sheet edge soldier. The lid is essentially heated only during the transfer. Since conical section of the preheated edge of the lid it sits against the cooler sheet, the lid is immediately sealed on the boat.

According to an embodiment preferred, the detachment tongue formed in the conical section of the edge such that a first section of the detachment tongue extends parallel to the conical section of the edge, and a second section of the detachment tongue is extends parallel to the circular base surface. Given that the detachment tongue only bends after applying the conical edge of the edge and the subsequent sealing is guaranteed during application a uniform distribution of force by middle of the punch in the conical section of the edge, since the tongue detachment is not sandwiched between the punch and the outer peripheral surface of the conical edge section. Bending the detachment tab is achieved an arrangement especially compact of this one.

According to another embodiment preferred according to the method according to the invention is conforms the conical section of the outward edge for its application with positive adjustment to the conical section of the mouth with a angle of 8º to 12º in relation to the longitudinal axis of the boat sheet, and the conical section of the mouth with an angle of 8º to 12º with relation to the longitudinal axis of the sheet boat. By setting the angle between the conical section of the mouth and the longitudinal axis or between the conical section of the edge and the longitudinal axis, in a value from 8º to 12º excellent adhesion is achieved by sealed and on the other hand the insertion and application of the lid on the conical section of the mouth. These effects can be increase further by fixing the angle preferably at a value of 9 to 10º.

Other preferred embodiments of the procedure according to the invention are described in the subordinate claims.

Other details, advantages and features are deduced from the following description of an embodiment example, in combination with the drawing. In this drawing you can see:

Figure 1 a longitudinal section view of a exemplary embodiment of a tin boat;

Figure 2 an enlarged view of a mouth section conical of the sheet can according to Figure 1;

Figure 3 a longitudinal sectional view of a lid of the sheet can according to Figure 1;

Figures 4A-4B a step away from process of cutting the starting material according to a form of realization of a procedure for the manufacture of a piece sheet metal;

Figure 4C an enlarged detail view corresponding to detail "C" of Figure 4B;

Figure 4D a phase of the contraction process of a section of the bottom of the sheet metal blank of Figure 4B, according to the embodiment of the procedure;

Figure 4E an enlarged detail view of the detail "E" according to Figure 4D;

Figure 4F a phase of the procedure of beaded of the bottom section according to Figure 4D and a section top of the sheet metal blank according to the embodiment of the procedure;

Figure 4G an enlarged detail view of the detail "G" of Figure 4F;

Figure 4H an enlarged detail view of the detail "H" according to Figure 4F;

Figure 4I a phase of the conification process of a mouth section of the sheet metal blank according to Figure 4F according to the embodiment of the procedure;

Figure 4J an enlarged detail view of the detail "J" according to Figure 4I;

Figure 4K a phase of the procedure rolled up the upper edge of the sheet metal blank according to the Figure 4I according to the embodiment of the procedure;

Figure 4L an enlarged detail view of the detail "L" according to Figure 4K;

Figure 4M an enlarged detail view of the Figure 4I;

Figure 5A a plan view of a lid without shape;

Figure 5B a longitudinal sectional view of a shaped cover;

Figure 6A the phases of the procedure of insertion and sealing of the shaped lid according to Figure 5B with the sheet metal blank;

Figure 6B the sheet metal cover obtained after insertion and sealing, with a detachment tongue that excels; Y

Figure 6C an enlarged detail view of the detail "C" according to Figure 6B.

Figure 1 shows a sectional view length of a sheet metal boat 2 formed from tinplate, with an axial welding seam not shown, a section central cylindrical 4 and a cover 6 formed of aluminum foil. The cover 6 seals a section of conical mouth 8 of the sheet metal can. The stretch from bottom 10 of the sheet canister has a contraction 12 and is closed by a bottom 14 formed in tin.

Figure 2 shows an enlarged view of the upper part of the tin boat 2. The section of the mouth 8 is conical and at its lower end 16 is directly adjacent to the first end of a reinforcement molding 9 bent inwards (see also Figure 4M). The diameter of the conical mouth section increases from its lower end 16 to its upper end 18 of  continuously, so that the inner peripheral surface 20 of the conical section of the mouth 8 does not present any step. At upper end 18 of the conical section of the mouth 8 is made a beaded 22 protruding from the enveloping surface 24 of the central cylindrical section 4. The inner peripheral surface 20 extending between the lower and upper ends 16, 18 (see Figure 4L) forms a seating surface for a conical section of the edge 26 of the cover 6. The length of the section of the edge 26 is corresponds to the length L of the conical section of the mouth 8 (see Figure 4L). The lid 6 also has a base surface circular 28 having a diameter that essentially corresponds with that of the central cylindrical section 4. Between the surface inner peripheral 30 of the edge section 26 (see Figure 5B) and the inner peripheral surface 20 of the mouth section 8 there are a layer of sealing material 23 formed by aluminum-polyethylene.

The reinforcement molding 9 formed in the perimeter inside of the canister 2 (see in particular Figure 4M) It has a radius of curvature R2 of approx. 2 mm, and for its first end directly links to the lower end 16 of the section conical of the mouth 8. The second end of the reinforcement molding 9 follow directly after the upper end of the section central cylindrical 4. The transition from the first end of the reinforcement molding 9 to the conical section of the mouth 8, and the second end of the reinforcement molding 9 to the central cylindrical section 4 each one has a radius of curvature R1 of approx. 1.2 mm The length S of the reinforcement molding 9 in the axis direction longitudinal B is measured from the lower end 16 of the section conical from mouth 8 to the upper end of the cylindrical section center 4. The length S is approx. 4.5 mm Lower end 16 of the conical section of the mouth 8 is aligned with the end upper of the central cylindrical section 4.

An angle? Between the surface inner peripheral 20 of the conical section of the mouth 8 and an axis geometric A offset parallel to the longitudinal axis B of the boat of sheet 2 is 9º (see Figure 6A). An angle? Between the conical section of edge 26 and axis A is also 9º (see the Figure 6A).

Figure 3 shows in a representation simplified only a longitudinal section view of the cover 6. To detach the cover 6 there is a tongue of detachment 34 performed on the same piece in the extension longitudinal of a partial area of the conical section of the edge 26. The detachment tab 34 shown in Figure 3 is folded and presents a first section 36 that extends parallel to the conical section of edge 26, and a second section 38 extending parallel to the base surface 28. Figure 3 also shows the sealing layer 32 formed on the inner peripheral surface of the edge section 26.

A procedure for sheet metal boat manufacturing 2.

Figure 4A shows a double body 40 of tinplate welded along its longitudinal edges, which serves as a starting material for the manufacture of the tin boat. He double body 40 separates along a cutting line 42 forming individual sheet metal blank 44 (see Figure 4B). Within the cutting process it is shaped outwards with respect to the longitudinal axis of the sheet metal blank 44 the section upper 46 of the sheet metal blank 44 along which Performs the cutting process. This lightweight conformed is depicted in more detail in Figure 4C.

Figure 4D shows how below it contracts the other final tranche 48, that is the tranche of fund 48 of the sheet metal blank 44 to form a cylindrical contraction 50 as depicted in Figure 4E, which has a diameter smaller than the central cylindrical section 44. Next, the sheet metal blank 44 is simultaneously beaded by both extreme sections 46 and 48, as shown in Figure 4F, respectively to form edge sections 52 and 54 upper and lower that open outwards. Figure 4G shows that the section of the upper edge 52 is performed as a section with a rounded edge 52 when continuing to form the end section upper 46. Figure 4H shows the section of bottom 48 after the beaded, during which the lower rounded section is formed from the edge 54.

Figure 4I shows the forming phase of the conical section of the mouth 8. After beading the brute piece of sheet 44 on both sides it is conformed immediately after the lower end of the section upper edge 52. The section of the  mouth 8 with an angle of 9º. The upper end 18 of the conical section of mouth 8 is direct continuation and without step of the section rounded upper edge 52, as shown in Figure 7J, and the lower end 16 of the conical section of the mouth is also continue directly and without step with the cylindrical section central 4. Only the zone is conformed by conforming directly adjacent to the lower end of the rounded section of the edge 52. The upper rounded section of edge 52 is only continues machining after the conificado to form the beaded 22.

The section is formed by conforming conical of the mouth 8 such that its diameter increases in shape continue from its lower end 16 to its upper end 18 thus forming a smooth surface. The conical section of the mouth 8 therefore has a length L (see Figure 4L).

Figure 8K shows that immediately after the upper section of the edge 52 is radially wound, thereby forming the flange 22 that is represented in the Figure 4L and extending over the entire enveloping surface 24.

Figure 4M shows that after forming the beading 22 forms the reinforcement molding 9 radially inwards in relation to the sheet metal blank 44. The reinforcement molding 9 is made by forming such that both the transition to the conical section of the mouth 8 and also the transition to the central cylindrical section 4 has a radius of curvature R1. The shaped reinforcement molding 9 has a radius of curvature R2.

Figure 5A shows the cover 6 cut out of a aluminum foil, in its starting state. Cap 6 is trimmed in one piece together with the release tab 34 and it then conforms by deep drawing, so that the conical section of the edge 26 is without folds. At least the area of the aluminum foil that forms the conical section of the edge 28 is coated with a layer of sealing material 32 formed of polyethylene, so that the inner peripheral surface 30 of the conical section of the edge 26 is covered (see Figure 3).

As can be seen from Figure 5B in which the sealing layer 32 is not shown, the tongue of detachment 34 extends in the longitudinal direction of the conical section of the edge 26 free of folds.

The lid 6 obtained by deep drawing and coated is held by a sealing punch that is not represented and taken to the conical section of the mouth 8 of the piece sheet metal 44 to apply there. In particular the upper face of the base surface 28 by means of the punch sealed. During the transport of the lid 6 the layer of heat is heated polyethylene 32 by means of the heated sealing punch.

Figure 6A shows how cover 6 is inserted equipped with the heated polyethylene layer 32 at the mouth of the piece springs from sheet 44. Accordingly, the cover is inserted into concentric direction to the longitudinal axis of the sheet can and sits of such mucus on the inner peripheral surface 20 of the conical section of the mouth 8 than the inner peripheral surface 30 of the conical section of the edge 26 sits completely on it, the polyethylene layer 32 being sandwiched. Thanks to the preheating the aluminum sheet with the aluminum layer 32 a secure seal is achieved. In particular it is prevented from this so that when the sealing punch is removed, the section detaches conical edge 26 of the conical section of the mouth 8 due to the conical sides of the sealing punch. Since the sheet has in the conical section of the mouth 8 a temperature much lower than the melting temperature of polyethylene layer 32, absorbs the thermal energy provided by the polyethylene layer 32. The section conical edge 26 is pressed against the conical section of the mouth 8 by the conical side of the sealing punch, which achieves a uniform distribution of the polyethylene layer 32 between the section conical edge 26 and conical section of the mouth 8.

Figure 6B shows a side view of the boat of sheet metal with release tongue 34 protruding after sealing. As you can see from the Figure 6C, the conical section of the edge 26 is completely attached to the conical section of the mouth 8.

After sealing the mouth with the lid 6 it fold back the release tab 34 so that its first section 26 extends parallel to the conical section of edge 26 and the second section 38 is parallel to the base surface 24, as is represented in Figure 3.

The sheet canister 2 that has been obtained is given to Then turn and fill with non-sterilizable products, for example peanuts or coffee, and then it closes so conventional with a bottom 14 made of sheet metal.

Reference List

2.

Tin boat

Four.

Central cylindrical section

6.

Top

8.

Conical mouth section

9.

Reinforcement molding

10.

Bottom section

eleven.

Contraction

14.

Background

16.

Lower end of mouth section 8

18.

Upper end of mouth section 8

twenty.

Inner peripheral surface of the mouth section 8

22

Beaded

24.

Enveloping surface of the central cylindrical section 4

26.

Section of the edge of the lid 6

28.

Circular base surface of the lid 6

30

Inner peripheral surface of the edge section 26

32

Sealing layer

3. 4.

Detachment tongue

36.

First section of the detachment tongue 3. 4

38.

Second section of the detachment tongue 3. 4

40

Double body

42

Cutting line

44.

Sheet metal blank

46.

Upper final section of the sheet metal blank 44

48.

Section of the bottom of the sheet metal blank 44

fifty.

Contraction

52

Upper section of the edge

54

Lower edge section

L

Height of conical mouth section 8

B

Longitudinal axis of the canister 2

α

Angle between inner peripheral surface 20 and the longitudinal axis L

\beta

Angle between inner peripheral surface 30 and the longitudinal axis L

TO

Geometric axis

R1; R2

Radii of curvature

S

Reinforcement molding length 9.

Claims (17)

1. Sheet metal canister (2) with a welding cord in the axial direction, a central cylindrical section (4), a conical section of the mouth (8) sealable with a lid (6) of a sheet material, characterized in that the Sheet metal boat has a reinforcement molding (9) to give rigidity to the conical section of the mouth (8), which is formed peripherally between the conical section of the mouth (8) and the central cylindrical section (4), and which protrudes inwards towards the longitudinal axis of the sheet canister (2) and which has a radius of curvature between 1 mm and 3 mm. 2. Sheet metal canister (2) according to claim 1, characterized in that the reinforcing molding (9) is directly contiguous at its first end with the conical section of the mouth (8) and at its second end directly with the cylindrical section central (4). 3. Sheet metal canister (2) according to claim 2, characterized in that the transition from the first end to the conical section of the mouth (8) and from the second end to the central cylindrical section (4) have two radii of curvature that are between 0 , 8 mm and 1.6 mm. 4. Tin container (2) according to one of the preceding claims, characterized in that, the cover (6) has a circular base surface (28) and a conical edge section (26) and because the inner peripheral surface (30) of the section of the edge (26) is fully attached to the peripheral surface inside (20) of the conical section of the mouth (8), being interspersed a sealing layer (32) of thermoplastic material. 5. Sheet metal canister (2) according to claim 4, characterized in that, the conical section of the edge (26) and the conical section of the mouth (8) are displaced outwardly respectively an angle of 8 ° to 12 ° in relation to the axis longitudinal (B) of the sheet canister (2). 6. Sheet metal canister (2) according to claim 4 or 5, characterized in that, to detach the cover (6) from the conical edge section (8) a detachment tongue (34) is formed in the conical edge section (26) ). 7. Sheet metal canister (2) according to claim 6, characterized in that the detachment tongue (34) is made of the same piece with the conical edge section (26), when cutting the sheet material, and is folded with such that a first section (36) of the detachment tongue (34) extends parallel to the conical edge section (26) and a second section (38) of the detachment tongue (34) extends parallel to the base surface circular (28). 8. Procedure for the manufacture of a boat of sheet metal (2) with an axial welding bead, a cylindrical section central (4) and a conical section of the mouth (8) that can be sealed with a cover (6) of a sheet material, comprising the steps following:

bend a starting material in the form of an iron to form a blank of cylindrical sheet.

give one longitudinal welding along the longitudinal sides of the sheet metal blank to form a sheet metal blank cylindrical (44) with axial weld bead,

characterized in that a reinforcement molding (9) that runs in the peripheral direction intended to stiffen the conical section of the mouth (8) is formed by forming the blank sheet metal part (44) between the conical section of the mouth (8) and the central cylindrical section (4), compressing the sheet metal blank (44) thereby inwards towards the longitudinal axis of the sheet metal blank (44) between the conical section of the mouth (8) and the section central cylindrical (4), which forms the reinforcement molding (9) with a radius of curvature between 1 mm and 3 mm. Method according to claim 6, characterized in that a first end of the reinforcement molding (9) is formed immediately following the conical section of the mouth (8) and a second end of the reinforcement molding (9) is formed immediately following the central cylindrical section (4). Method according to claim 9, characterized in that a radius of curvature is formed between 0.8 mm and 1.6 mm respectively in the transition from the first end to the conical section of the mouth (8) and in the transition from the second end to the central cylindrical section (4). Method according to claims 8 to 10, characterized by trimming the cover (6) with a detachment tongue (34) of a sheet material, forming the cover (6) to form a circular base surface (28) and a section tapered edge (26), at least the area of the sheet material forming the tapered section of the edge (26) covered with a layer of thermoplastic sealing material (32). 12. Method according to claim 11, characterized in that the forming phase of the lid (6) comprises: deep drawing of the lid (6) to form the circular base surface (28) and the conical edge section (26), such that the conical edge section (26) is made smooth. 13. Method according to claims 11 or 12, characterized in that the fastening of the shaped cover (6) is carried out by means of a heated punch that heats the thermoplastic sealing layer (32) during transport of the shaped cover (6) to the blank. welded sheet metal (44), insertion of the shaped cover (6) in the section conical of the mouth (8) of the welded sheet blank (44), seat of tapered edge section (26) against the conical inner peripheral surface (20) of the mouth section (8), such that the conical edge section (26) seats completely on the conical inner peripheral surface (20), the thermoplastic sealing layer (32) being intercalated heated, and tightly sealing the conical section of the mouth (8) of the welded sheet metal blank (44), whereby it is obtained the sheet metal canister (2) sealed with the lid (6). 14. Method according to claim 13, characterized in that the cover (6) is inserted in such a way that the lower edge of the conical section of the edge (26) is located in the transition zone from the first end of the reinforcement molding to the conical section of the mouth (8). 15. The method according to claim 13 or 14, characterized in that the punch settles the tapered section of the edge (26) on the cooler inner peripheral surface (20) of the section of the mouth (8), and removes it before the sheet has reached the melting temperature of the sealing cap (32). 16. Method according to one of claims 12 to 15, characterized in that after sealing, the detachment tongue (34) formed in the conical edge section (26) is retracted in such a way that a first section (36) of the tongue of detachment (34) extends parallel to the conical section of the edge (26), and a second section (38) of the detachment tab (34) extends parallel to the circular base surface (28). 17. Method according to one of claims 8 to 16, characterized in that the conical section of the edge (26) and the conical section of the mouth (8) are deformed outwardly for the seat with positive adjustment to each other, respectively with an angle from 8º to 12º in relation to the longitudinal axis (8) of the tin boat (2).