WO2005044684A1

WO2005044684A1 - Plastic coating of the end-inner area of a cap

Info

Publication number: WO2005044684A1
Application number: PCT/DE2004/002424
Authority: WO
Inventors: Hans-Peter Hein
Original assignee: Amcor Limited
Priority date: 2003-11-07
Filing date: 2004-11-02
Publication date: 2005-05-19
Also published as: EP1682424A1

Abstract

The aim of the invention is to create a cap, whose sealing behavior is identical to that of common PT sealing systems, wherein the amount of compound used is reduced, meeting current and future requirements related to the sealing of containers which are filled with foodstuffs. The invention relates to a method for forming a tight, sealing zone (10;10V,10D) which is provided with a compound (A,B) in a cap (1) made of a substantially metal material. Two methods for applying two compound layers are used successively, involving the application of a first compound (A) and a second compound (B), said compounds being different from each other. The two compound layers (A,B) extend in different geometrical areas (Area 2, Area 3) of the cap in the edge area (R) thereof with a tight and sealed area (10D,10V).

Description

PLASTIC COATING OF THE INSIDE INTERIOR OF A LID

The invention is concerned with a method for forming the compound layers in a sealing cover made of preferably metallic material. Such caps, also called "caps", are used to close containers, preferably glass containers, whose upper end section is provided radially on the outside with cams, which are circumferentially limited as screw cams, but each extend obliquely in order to rotate the "caps" into one to be able to implement axial movement and thus to be able to close and remove the container with the described closure lid. The closure lids therefore serve for reclosable use on a container.

The invention relates to a method for producing such a lid closure, in particular for manufacturing the compound layer in the edge region of the closure lid, the compound layer sealingly sealing with the front end of the container and having a mechanical closing effect laterally on the upper end section of the container. This area thus has a dual function of sealing and closing, so that it should be referred to as the sealing and sealing zone of the cover (radially outside a cover mirror or panel).

The invention also relates to the closure cap produced by the method, which includes the cover mirror and the edge area, referred to as the "panel area" and "edge area". These two areas merge into one another via a transition zone, which is to be referred to as the lid mirror edge area.

Finally, the invention relates to a molding tool for placing and shaping an introduced compound (as a preform) in the edge region of the lid {claim 20}.

The prior art has a large variety of such closure cover types available for closure covers. One type of closure to be picked up here is the PT closure cap, described in EP-B 844 972 (Taber, White Cap), there in particular in column 1, paragraphs [03], [04], which are included here for explaining PT caps. They are provided with compound in the edge area, which both Closure function, as well as sealing function. An axial section of the compound is used for sealing by means of an axial pressure, the screw cams on the container to be sealed pressing into the compound and causing a mechanical locking which can later, in use, only be released by turning. The "P" stands for axial pressing (P-Closing) and the "T" stands for screwing opening (T-Opening), cf. Claim 14, generic term.

Two essentially different methods of introducing the compound are used to produce such sealing caps. The lining compound process and the molded compound process, which are explained with reference to FIGS. 1 and 2, alternatively also in a mixed form in US Pat. No. 5,686,040 (Taber, White Cap), cf. there abstract. In the latter document, the sealing material is introduced through a nozzle in a circumferential stiff shape, which corresponds to the lining method. In addition, to change the position and shape of the compound introduced while it is being deformable, stamp shaping is used, which corresponds to the molded compound process. In the described sealing caps, two types of sealing caps can be distinguished, those with a circumferential "channel" in the edge area, which has an essentially flat bottom, cf. see EP-B 844 972, there FIG. 29, and those sealing covers which have a wedge-shaped circumferential channel in the edge region, cf. in addition US-B 5,413,234 (Hekal), there cover sheet, upper figure, and associated abstract.

The invention has set itself the task of creating sealing lids with a closing behavior that is identical to current systems, in which the amount of the compound used is to be reduced in order to reduce the costs. In particular, current and future requirements are to be met, which involve the closure of containers that are filled with food. In addition, in the framework of the fulfillment of these goals, a fundamentally new submission process should not be created that entails additional costs, but known processes should be adapted accordingly. The invention therefore intends to work as closely as possible on the prior art in order to make the transition to the new method, new sealing cover and new tool as smooth as possible, but at the same time also to provide the properties of the new cover described above.

This object is achieved with a method in which two layers of compound are introduced in the edge area {claim 1, claim 14}. The two layers of Compounds are preferably two different types of compound {claim 19, claim 1}, the distinction being in a chemical nature or in a physical property. One of the compounds can be inexpensive in nature and its food compatibility does not have to be as pronounced if it is only used radially far outside in the sealing area of the sealing and sealing area. The second compound can be of higher quality, that is, it is burdened with higher costs, but is only used to a limited extent in its radial extent, in an area that seals the front side of the container and potentially comes into contact with the food in its closed state on its radial inner edge.

The radially inner compound is improved in terms of food compatibility, but is reduced in quantity, while the radial strength of the compound located further out can be optimized in its mechanical strength without having to solve the property of food compatibility. This does not rule out that both compounds are of the same chemical and physical nature, only they are introduced into the edge area of the lid using two different processes in order to then create an interface between them, which can be used to recognize that a Claim 1) manufactured cover {claim 14} was provided with two differently introduced compound layers, even if they consist of the same compound material.

In the two different processes, the process “molded compound” described at the beginning is used (for the compound lying radially further out), and the lining process (as described at the beginning) for the layer of compound lying radially further inside. This results in an overlap zone between these two compounds introduced one after the other, which causes the previously mentioned intermediate layer, which is recognizable on average from an analytical point of view. The compound on the outer edge region, in the case of an axially extending apron, is preferably inflated to a greater extent than the compound lying radially further inward, which makes the front-side seal with the front-side end of the container.

By naming the compounds as the first and second compound {claim 1}, no order is specified in which these compound layers are introduced as layers in the edge region of the sealing cover. It is only intended to express a distinction in that the first compound is introduced by a first method and the second compound by a second method, which two methods were explained. The order of these procedures can be changed. The layer in the apron area can be inserted first. However, it is also possible first to introduce the compound layer lying radially further inwards, which is introduced using the lining method. According to the order of the methods used, there is a corresponding overlap zone in which the two compounds overlap, which is preferably located in the area of the circumferentially provided groove {claim 14, feature (a)}. However, the two methods can also be described in such a way that the radially outer layer does not extend (or not significantly) beyond the inner radial end of the circumferential groove {claim 14, feature (a)}. Alternatively / cumulatively, the radially inner compound layer should not extend further radially outward than the radially outer end of the circumferential groove or the "channel" in the cover {claim 14, feature (b)}.

Further alternatively / cumulatively, the two layers can be distinguished in such a way that one layer extends essentially radially and the other layer essentially axially, but both layers have a given thickness, which is provided for their purpose. The essentially radial position is adapted to the sealing of the container at the front. The essentially axial position is provided for the closure zone in order to cooperate with the screw cams of the container. Both layers together form the sealing and sealing zone, which is placed in the edge area, but does not necessarily have to occupy the entire edge area of the sealing lid.

Between the edge area of the lid and the panel area (the lid mirror) there is a transition zone which extends radially within the circumferential groove. The compound layer lying radially further inside practically does not extend into this area, preferably not at all, so that the least possible contact of this layer with the sealed foodstuff takes place inside the container.

The three sub-areas of the sealing and sealing zones described in the edge area of the lid can be oriented in such a way that they are called "Areal", "Area2" and "Area3". The first zone, "area", is in contact with the contents, so it is located in the intermediate area (transition zone) between the panel and the edge area. The second zone, "Area2", is the sealing area, which mainly performs the sealing function with the front end of the container. The third zone, "Area3", is used for embedding the thread and ensures the mechanical closure or the hold of the closed lid after it has been closed with an axial press, in order to be opened later by screws.

The compound layers introduced with the different insertion methods occupy different geometric sections in the edge area, such as the closure area and the sealing area {claim 1}; an overlap zone is provided {claim 9}. Through the targeted introduction of the two compound layers, different properties can be created in the sealing and sealing area. Each section of this sealing and sealing zone can be assigned its own properties. The introduction of the compounds through the combined use of molded compound and lining compound serves for the precise alignment of the compound used in each case for its specific purpose at its specific location in the edge region of the sealing cover {claim 8}.

The lining process is achieved by injecting a compound that rotates the lid. After the compound has been introduced onto a circumferential path, there is no need for mechanical post-forming by means of a ring stamp {claim 2}. However, there is a rotation of the closure cap during or after insertion, with a displacement effect, the still flowable - just injected - compound being moved radially outward, but only to a limited extent {claim 2; Claim 14, feature (b)}. This radial displacement can also start during the injection.

The compound preform, which is also introduced in the manner of a lining process and is located radially further outside than the above-described lining introduction, is deformed with a stamp which is a ring stamp {claim 20} after the introduction {claim 3}. This second compound is initially placed (when inserting, with a rotation of the closure cover), but then has no rotational deformation, but an axial stamp deformation, which only extends into an area of the sealing and closure zone that at least contains the closure zone of the cover. This is an essentially axially extending deformation, with small amounts of radial deformation, insofar as the circumferential channel of the metallic "shell" (the cover blank) is affected {claim 15}. To the extent that this compound extends into the sealing zone {claim 4}, this compound layer is rotated by a subsequent lining forming

Insertion and rotary displacement, covered, so that the surface of the sealing zone is formed only by the second introduced compound in the edge region of the lid. The overlapping zone that is formed is then designed such that it points axially, to the frontal closure area of the container, only the second compound is exposed, while the first compound underneath is covered.

If the order of the processes used is reversed, the second compound geometrically deformed by the molded compound process does not extend into the sealing zone, but remains only in the sealing zone {claim 3, claim 14, features (a) and (c)}.

If the second applied compound also extends into the sealing zone {claim 4}, it is covered there - as previously explained - by the first compound subsequently introduced, which is displaced from the inside radially by rotation of the cover.

In other words, the displacement of the two compounds after their respective introduction as a circumferentially extending, toroidal compound strand is limited {claim 5}. This limitation can be brought about by an annular lock so that this lock is either in the cover groove {claim 7, claim 25, claim 26}, or is provided by the annular stamping tool {claim 6}, on the front side of which it is as front elevation, such as web, or as a relatively sharp edge on the outer edge is provided.

During each deforming displacement of the second compound, either the stamp or the ring-shaped lock in the circumferential groove of the sealing cover counteracts the radially inward flow movement of the deformed compound from a predetermined point and limits this flow movement {claim 5}. It therefore does not extend any further than into the sealing zone, based on the point in time at which the flow of the second compound caused by the ring stamp ended. This inner limit does not mean that this flow movement should always extend to the inner end, it can also be ended earlier, for example by the edge of the ring die located radially far outwards

{Claim 21}, but it can also be ended later if it is limited by the radially inner edge of the circumferential groove. Intermediate positions are possible {Claim 6, Claim 7}, caused by the axial elevation on the ring stamp {Claim 22} 7 or annular lock in the circumferential groove of the cover, as a circumferential bead which has a small height which is less than the depth the circumferential groove. This lock is preferably used within the circumferential groove in the case of a shape of the circumferential groove which has an essentially flat, horizontally running bottom. In an alternative groove, which is essentially The circumferential lock for the radial inward movement of the second compound (due to the stamping) is predetermined or blocked by the shape and geometry of the ring stamp.

Further improvements to the structure, the adhesion and also the other properties of the double layer result from the use of an additional stamp which also applies a compressive force to the compound layer introduced radially further inwards, the first compound {claim 10}. This pressure can be applied before the second compound is introduced, or afterwards. The axial pressure creates one

Uniformity of axial height. The first compound, which is displaced too radially outward by the rotational movement and thus lies at too great a height (thickness), is pushed back to an essentially uniform axial height or thickness, which has two advantages. Blisters are reduced and the adhesion between the two compound layers or the adhesion of the first compound layer to the sheet metal cover in the circumferential groove is improved. This improvement in the regression of bubbles and the increase in adhesion take place in extensive strip shapes. An edge line of the radially inner compound, namely the most radially outer edge line as the boundary line, is in terms of its non-uniformity

("Tip formation") improved and can be evened out by the additional stamp action {claim 11}.

The second stamp has a different shape than the stamp which is used for deforming displacement of the radially outer compound {claim 20}. The step of rotary displacement by centrifugal force for the compound located further inside can be reduced in strength due to the stamping. The result is a double layer of compound, which is bubble-free, has good adhesion and is formed without jagged, frayed transitions, that is to say with good transitions. This process step in the sense of post-forming supplements the lining process with an additional process step. This process step acts on the still flowable first compound, in order to reduce bubbles or improve adhesion {claim 12}, in each case in a strip area near the outer edge of the compound layer located radially further inwards.

If the combination groove is used {claim 7}, the additional stamp permits channel formation on its end face {claim 13}, which is delimited by a radially outer web {claim 24}. A circumferential recess ensures pressed-on condition for the channel formation to take up and radially constrict the compound already applied and displaced by centrifugal force. At the same time, the compound is pressed on, the adhesion is improved and the conditions for a better separation of surfaces in the overlap zone are created in the area of the smaller, narrower groove. Here, the smaller groove in the larger (wider) circumferential groove has a different task than the same groove in the application process in which the compound lying radially further out is first applied {claim 7}. The smaller ring groove in the larger circumferential groove at least hinders further radial displacement, although it may not prevent it entirely. In the sense of an existing lock or obstruction, depending on the quantity applied and the selected speed, it has a more or less "disabling" effect on the outward displacement of the still flowable, radially inner compound. It goes without saying that this lock has the consequence that the radially further outward lying compound is applied in a subsequent step and is displaced deforming again by a stamp {claim 13, claim 20}.

With the two combined introduction processes, the extent of the compound in the "area" (in the edge of the panel) can be greatly reduced or even completely avoided in order to minimize contact with the filling material. Practically only the surface used for sealing is covered by the high-quality compound with a free surface provided for sealing, which is "Area2". The "Area3" for creating the mechanical hold is not or only insignificantly occupied by the high-quality compound. The geometrical position and spatial extent of the two compound layers, which consist of the first or second compound, which are preferably different, are thus specified in a dedicated manner, based on their suitability and purpose {claim 8}. This specification of the geometrical extent is particularly favorable for PT closure lids which require the compound in the apron area of the lid for closure purposes. Any shape of the circumferential grooves in the area between the apron and the cover mirror can be used, with a rounded bottom {claim 18}, with a flat bottom {claim 17}, or with an additional bead in the flat bottom. The amount of the high-quality compound to be applied, which must be food-compatible, is limited to the "Area2" area. The "area" is practically free of sealant and the "area3" can be occupied by a lower-quality compound for the purpose of mechanical maintenance. The exact geometry and extent of the higher-quality compound in the "Area2" can be determined by the location of the introduction of the toroidal, circumferential compound preform, the speed of rotation of the closure lid and the amount or mass of the compound initially introduced. The shape and position of the second compound is determined by the shape and geometry of the stamp, which causes the displacement and deformation of this compound after it has been introduced. In stamp forming, this process is divided into two sections, the introduction of the compound preform and the stamp forming. When introducing the first compound using the lining process, these two process steps can also overlap in time by rotative introduction and rotational displacement, so that the rotational speed at the same time causes radial displacement.

It should be taken into account that the lid with its apron is occupied by the compounds and that these compounds are deformed in this position of the lid, while the lid is used in reverse after manufacture and in normal use, with the compound layers axially below.

Exemplary embodiments explain and supplement the invention in the sense of "embodiments".

Figure 1a, Figure 1b illustrate the introduction of a compound layer C * with a process according to "molded compound", in two steps, the introduction of the compound as preform C and the mechanical deformation by a punch 40 ^* .

Figure 2a,

FIG. 2b illustrate the introduction of a compound preform C by a "lined compound" method, with the introduction of the compound and a displacement C "by rotation, here without using a stamp.

FIG. 3a illustrates three sections or areas "Areal", "Area2" and "Area3" to be distinguished here in the case of a cap 1. Only the edge area of this cap is shown, with a section of the radially outer end of the cover mirror 3 *, which is shown here should no longer be considered. The cap 1 is occupied in the edge area by a stamp 40 which acts from the bottom upwards with respect to the compound C, which extends into all three areas "area", "area 2" and "area 3".

FIG. 3b illustrates the finished cover after the production according to FIG. 3a, here applied to a container 90, the upper edge portion of which is provided with radially outwardly projecting screw cams which engage the compound C in the "Area3". On the face side, the container 90 is sealed with the "Area2", while the area with its compound extends radially inside and with access to the food (not shown) inside the container. Figure 4 illustrates a cover as an embodiment of the invention, in two perspective views, from the inside and from the outside.

FIG. 5 a illustrates the edge area R of a closure cover 1 in an axial section with the three circumscribed areas area, area 2 and area 3 and an introduced compound A in a circumferential groove 21. FIG. 5b illustrates the action of a stamp 40 for forming a second compound B on the apron area 4 of the closure cover 1 from FIG. 5a.

Figure 6a,

Figure 6b illustrate the introduction of the first compound with subsequent pressurization by a further stamp 50, as well as a state of the manufacturing process of the cover, in which the second, more radially outer compound B is deformed with the stamp 40, as it is shown in Figure 5b was shown.

FIG. 7a illustrates an alternative closure cover 1, for example that closure cover from FIG. 4, with a circumferential groove 20 which has an essentially horizontal bottom, into which groove 20 a compound layer A is inserted.

FIG. 7b illustrates the same cover from FIG. 7a in a further processing step, with an additional introduced and displaced deformed second compound layer B on the axially extending apron 4, with a punch 40 in its end position, which is moved axially into the displacing deformation.

8a, 8b illustrate a manufacturing method similar to that of FIGS. 6a, 6b, but with a different shape of the circumferential groove 20.

FIG. 9a illustrates a closure cover with a circumferential groove 21, which has a rounded groove bottom 21a, a stamp 40 with a different end design than that according to FIG. 6b engaging in the cover in the edge region.

FIG. 9b illustrates the same cover from FIG. 9a, after a further process step with an additional layer of compound A in area 2. FIG. 10a illustrates a further production method with the introduction of the compound B lying radially further outwards as the first layer according to FIG. 9a.

Figure 10b is a later step in the manufacturing process in which the compound A lying radially further inside is leveled with a further punch 51.

FIG. 11 a illustrates a cover 1 similar to that of FIG. 7 a, with an axially and inwardly moved punch 40 for forming a compound layer with compound B and with a web 42 of the punch 40 running all around on the end face.

FIG. 11b illustrates a further processing step of the cover according to FIG. 11a, with which processing step the second compound layer of compound A was introduced.

Figure 12a,

FIG. 12b illustrate a manufacturing method corresponding to FIGS. 11a, 11b, only with an additional stamping by stamp 51 with axial pressure on the radially inner layer of compound A.

Figure 13a, Figure 13b illustrate a cover 1 similar to that of Figure 4, with an additional peripheral bead 20a, which is smaller in width and height (depth) than the circumferential groove 20. The radially inner compound is first introduced and then through Centrifugal force shifted deforming. FIG. 13b shows a later method step in which the compound B lying further radially outward is deformed by a stamp 40 and an overlap zone is formed in the region of the smaller peripheral bead 20a.

FIG. 14, FIG. 14b illustrate two process sections of a process for producing a cover 1 with two layers of compound and two stampings. Figure 15a,

FIG. 15b illustrate a method with two stamp reshaping, the closure cover having a shape as shown in FIGS. 13a, 13b. Here the outer compound B is first applied, then the inner compound and a second stamping with a stamp 51 takes place in relation to the compound located radially further inside.

FIG. 16a illustrates a cover 1 similar to that of FIG. 4, with an additionally introduced peripheral bead 20a in the circumferential groove 20. In the edge area, a stamp 40 engages in the cover, which forms the first compound layer with compound B.

FIG. 16b illustrates a further processing step, after that of FIG. 16a, with which further processing step the compound layer of compound A is introduced in area 2.

Figure 17 is an enlarged detail of the circumferential groove 21 of Figure 5b. The blocking effect of the outer radial edge 41, which is relatively sharp, is to be shown.

FIG. 18 illustrates an enlarged detail of FIG. 13b in the circumferential groove 20, 20a as a combination groove 22. The engaging punch 40 has an end elevation 42 ', which is weaker than a web and protrudes in a wedge shape, sufficient to have a blocking effect on the element placed under axial pressure outer compound B and to prevent it from being displaced radially more inwards.

In the figures, the mode of operation of the two addressed methods of the molded compound and the lined compound will first be described, which is to be done with reference to FIGS. 1 (FIGS. 1a, 1b) and FIGS. 2 (FIGS. 2a, 2b). FIGS. 3b and 3a schematically show a sealing cover according to the prior art and a production method using the molded compound method for the production of the sealing cover according to FIG. 3b. From the manufacturing process, the state of the engagement of a stamp 40 is shown, which has already deformed the compound layer C according to FIG. 1a, as is illustrated schematically according to FIG. 1b, only in relation to the shape of the cover in the edge region. This lid is then applied to the glass container by an axial push as it moves away from it Glass container can be loosened by a screwing movement and can be attached again. This is illustrated in FIG. 3b (press twist).

First of all, it should be said that the axial sections, which are shown in the figures, show the edge region of a closure cover, which also has a panel region (not shown here in depth) and a narrow transition region provided between these regions, which is referred to as panel edge region 3a , The edge region R is the one that has the closing task and the sealing task with reference to the container 90 to be closed. The panel area hides the opening of the container, which is usually designed as a wide-necked vessel, which is illustrated in part in FIG. 3b and is otherwise not shown in detail. In addition, it should be noted that a stamp movement and an insertion movement of the compound generally take place axially from above, that is to say the apron region of the lid protrudes upwards and the panel region lying horizontally is fed to the corresponding method steps. In use, however, the lid is then reversed, with its apron area oriented axially downward. In order to be able to better compare the process, the process steps and the associated compound layers, the axial stamp formations are also shown engaging from below in the figures, although in practical use they intervene axially from above, with the cover lid inverted, in the process stages. Insofar as the reference symbols from FIG. 4 are not repeated regularly, the same components and sections of the closure cover are used. As far as the prior art is described in Figures 1 and 2, the same reference numerals are used, only with an asterisk. The compound here is uniform C.

A first method according to FIGS. 1 is the introduction of a toroidal compound C through a nozzle into the edge region of a sealing cover 1 (shown schematically), radially outside and, in the illustration shown, axially slightly below a circumferential groove 2 * during a rotary movement ω1. This radial introduction is predetermined by applying the toroidal compound raw structure C (preform) to the side wall 4 *. In reality, the insertion is reversed, with an insertion from above axially, with the cover mirror 3 * lying flat, so that the raw structure C is arranged axially slightly above the groove 2 *. In the following, however, the orientation that is shown will always be described, with the comment given here and before that the manufacturing process is axially reversed. In a second step according to FIG. 1b, a plunger 40 * is introduced in the direction P1 from the bottom axially (real from the top axially) into the edge region R of the closure cover 1 *, shown here as raised, lowered axially in the direction P1, by applying a compressive force , The shape of the compound C is changed and displaced in the radial inward direction and in the radial inward direction r1 and in the axial downward direction z1. This creates a layer C * of a compound, which extends radially inward also over the inner edge of the circumferential groove 2 ^* , not yet shown here, but with increasing pressure due to the stamp thus formed, which also causes the compound to move inward over the inner edge of the groove. The finished cover, after the stamp 40 ^* has been removed, has a sealing and closure layer provided by molded compound, which in the axial region effects the interaction with the inclined cam sections, which are not shown here, but can be seen in FIG. 3b. On the face side, the position placed in the circumferential groove 2 * ensures sealing, as shown in FIG. 3b in relation to the face side of the upper section of the glass container 90.

A second alternative way of introducing compound is illustrated in FIGS. Here, a raw form of compound C is injected radially further inwards, on an inner edge of the ring groove 2 *, through a nozzle, while the cover rotates at the rotational speed ω1. Here, too, the axial orientation is shown in reverse, the raw form C is introduced into the groove 2 * from above. During the rotation ω1 or during another rotation ω2 which is carried out later, the compound shifts essentially within the groove 2 * in the direction r2, with a substantially radial direction of displacement or also with a slight axial component, in order to form a sealing layer C "which is suitable, as shown in Figure 3b, to cooperate sealingly with the end face of the container 90. By a second application of a toroidal compound material at the radially outer end of the annular groove, after the second step shown in Figure 2b, by rotating the closure cover 1 * as well, the apron area 4 * can also be provided with a sealing layer, as corresponds to the sealing layer in FIG. 1 b.

The deformation according to FIGS. 1a, 1b illustrates FIG. 3a with reference to a real geometry of a closure cover 1 in the edge region R.

There are three areas, Area2 and Area3, which are formed during the stamp movement 40 *. The same areas are illustrated in FIG. 3b. with reference to the sealing cap in the attached state on the glass container 90. Area lies freely within the inner edge of the glass container. Area2 provides the axial sealing function and Area3 provides the mechanical holding function on the cams of the glass container. A lower curling section 5 * adjoins the apron area 4 *.

Area2 extends both radially and axially. Area3 essentially only extends axially. The area extends essentially only radially. All areas 1, 2 and 3 mentioned are designed from the same compound, in the same process, which corresponds to that of Figure 1b. For this purpose, the stamp 40 has suitable contours, some of which are provided with radial grooves, which allow the compound to penetrate into the inner region, which area is designated. In all three areas extensive structures are formed from compound, for different purposes. Due to the contact with food in the area, the compound must be food-compatible, but because of the presence in Area2 and Area3, it also requires the entire functionally required extension in the edge area of the sealing cover. This compound is labeled C.

An example of a cover according to FIG. 4 works with the same geometries of the metallic shell of the closure cover, the edge region R being shown separately. The cover mirror 3 forms the panel area, which will not be explained further here. The panel edge area 3a leads over to the edge area R, or the edge area also includes an edge section of the panel, as can be seen in FIG. 3b with the area. The apron section 4 extends essentially axially, is slightly geometrically contoured and ends in a lower one

Roll-in section 5, which ends in the illustration in FIG. 4 with a sharp lower edge, but can be provided in accordance with FIG. 3a or 3b with a roll-in 5 (or 5 *) which is provided at the axially lower end of the area 3.

Between the panel edge area 3a and the apron section 4 is the

Circumferential groove 2 is provided, which is designated schematically. In the following figures, different geometries of this circumferential groove 2 are named 20 and 21 respectively. A look into the inside of the cover according to the left-hand illustration of FIG. 4 shows two geometrically different and differently shaped compound layers A and B, which are introduced into the cover according to the methods to be described. These compound layers A, B are located in the edge region R and have a sealing function and a closing function there. They form a sealing and sealing zone 10, the individual sections 10D and 10V of which are different Functions is assigned. Zone 10D is used for sealing, on the end face on the top of the container 90, as illustrated in FIG. 3b. This layer of compound A extends essentially radially, but has a thickness in the axial direction. The essentially axially extending position of the compound B is the closure region 10V. This location extends in Area3. It serves for closing with the radially outwardly pointing cam on the upper section of the container 90.

Several manufacturing processes are explained in different pairs of figures. FIGS. 5a, 5b, and FIGS. 7a, 7b show the same method, only with two different forms of circumferential grooves 20, 21 on a closure cover 1 according to FIG. 4 in the edge region R. FIGS. 9 and 11 are in the same way for an identical method, further exemplary embodiments, the two different geometries of the circumferential grooves 20, 21 forming the distinction, with the respective consequence of a different design of the compound layers A and B. In FIGS. 16, a new type of circumferential groove 22 is used, with one Method similar to that of Figures 9 and 11.

Not all of the method steps are shown in the pairs of figures mentioned, but only two method steps in each case, which make it possible to distinguish the methods described from the prior art.

According to FIG. 5a, a preform of a compound A is first placed on the radially inner end of the groove 21 in accordance with the procedure of FIG. 2, which is done by turning the sealing cap 1 (cap). This lies with its apron 4 pointing upwards on a support. Already during the rotation, or separately thereafter with a step of separate rotation, the deformation of the toroidally injected compound B of the preform into the shape according to FIG. 5a is generated. It practically occupies the complete groove geometry 21. The groove geometry 21 is designed in such a way that in axial section it has a rounded bottom section 21a and a slope section 21b which is inclined with respect to the horizontal and with respect to the axial. The rounded bottom has a radius of curvature which is very narrow and the orientation of the curvature is perpendicular to the circumferential direction and to the axial direction. The slope portion 21b is provided radially inside the curve portion 21a. This shape is mapped onto the compound layer A distributed by a rotation ω1 or ω2. In a later process step, which follows the one mentioned in FIG. 5a, a toroidal shape of another compound B, which is located radially further outside, is introduced again, in accordance with FIG. 1. In a stamp forming process in accordance with FIG. 5b this shape is changed to the shape of compound B shown, the compound making a flowing movement and being essentially axially changed and flattened. The result is a compound layer B, essentially in area 3, but also extending in area 2, which overlaps there in area 2 with the compound layer A introduced first. The overlap takes place in the area of the groove 21.

The stamp geometry of the stamp 40 with a radially outer edge 41 limits the flow movement of the compound layer B in the radial direction, so that it is not far, but only a little in the area 2, when the movement and pressing by the stamp 40 ends.

After the stamp 40 has been removed, the compound layer geometry is defined, a radially inner first layer which was introduced first and is the compound layer A, and a radially further outer layer as the compound layer B which extends essentially axially and the apron area 4 covered in area3. Both layers have different functions, the former sealing function and the second layer a mechanical holding function.

The "three areas" (areas or sections), area radially inside the outer edge zone 3a of the cover mirror 3, area2 as the sealing area 10D and area3 on the apron 4 in the closure area 10V are as described at the beginning. The finished sealing cover according to FIG. 5b shows that the area has hardly any sealant, possibly a very small amount is formed at the edge area, but practically without a sealing covering, compared to the sealing end section of FIG. 3b, which extends far inwards. Both layers A and B have no constant thickness along their respective main extension direction, so the compound layer A in the radial direction is already through the wedge-shaped groove with the two sections 21, 21b, and the axial layer B, which is due to the shape and geometry results in the ring recess 46 of the punch 40, which runs essentially perpendicular to the end face, as described above and, during the pressing process, is in contact with the first sealing layer A. Between the two courses, the end face and the inner wall of the recess 46, there is a substantially annular, relatively sharp kink, with which a lock, also referred to as an edge, is used to block a significant, clearer formation of the compound B in the radial direction. Compound B also has an axial

Main direction a different thickness (measured in the radial direction). Both main directions of extension are much larger than the secondary direction of extension belonging to the same position in the sense of the respective thickness: the radial Thickness in the axial compound layer B, and the axial thickness in the radial compound layer A.

It should also be mentioned that the punch 40 has a fuselage section 40a which is considerably wider than the end section, which is narrower and has the locking edge 41 on the edge. Between these two differently dimensioned sections 40a and the end edge of the punch 40, a surface 45 runs radially on the inside, which essentially changes continuously in the slope, for a change in the thickness of the punch 40.

The different areas of the stamp have the different functions that were described. The ring recess 46 is used for the change in the sense of a deformation and displacement of the preform of the compound B applied radially further out; the front side is only used for planting and its edge serves to prevent further spreading.

The compound layer structure according to FIGS. 7a, 7b can be applied in a comparable sequence of processes, only here the circumferential groove 20 is provided with a flat bottom which runs essentially horizontally. The correspondingly illustrated structure on the first compound layer A introduced by the lining method according to FIGS. 2 is essentially flat, ring-shaped and covers the essential section of the area 2. In a later process step, the stamp 40 forms the second compound layer B after insertion, here also extending essentially axially with an overlap area which lies in the channel 20 of the area 2. The radial inward flow movement of the deforming compound of layer B is limited by the radially outer, upper edge 41 of the stamp 40.

The stamp 40 has on its outside a recess 46 which runs in an annular shape and determines the shape of the compound layer B. On its inside, the stamp is provided with its continuously extending surface 45, which leads from a narrow end region to a thicker body region 40a of the stamp. The narrow end region, on the outer edge of which the edge 41 is also formed, is narrower than the circumferential groove 20, both in FIG. 7b and in the other geometry of the circumferential groove 21 according to FIG. 5b. A radial inner edge 43 of the end face of the stamp 40 is designed without grooves and without a rounding, since it no longer has to be suitable for allowing the compound displaced radially inward to the area to pass through. Rather, this flow of compound B is already influenced by the Edge 41 is braked, blocked or prevented in its radial inward movement, so that the inner edge 43 of the end face of the stamp can be freely designed, but preferably rests on the compound of layer A in a sealing manner, without radial grooves, grooves or other flow zones for displacement the compound layer B are provided on the end face of the punch 40, which extends beyond the inner end of the groove 20.

In the edge area R, a zone 10 is provided as the sealing and sealing area, which has two sections, an essentially axially extending zone 10V and an essentially radially extending zone 10D. This adjoins the panel edge area 3a radially on the inside, which surrounds the panel area 3. In the

Sealing zone 10D, which corresponds to area 2, lies compound A according to FIGS. 5a and 7a. In both versions, the area in the edge of the panel is without a sealant layer. The area3 essentially corresponds to the sealing zone 10V of the sealing and sealing zone 10.

When the compound A according to FIGS. 5a, 7a and the subsequent figures relating to the lining process section, which is preferably in the form of injection, is introduced and shaped, without mechanical re-forming by means of a further ring stamp. The ring die 40 also does not cause any flow movement radially inwards or flow flow radially outwards, based on the first compound of layer A, rather the ring stamp 40 is only concerned with a deformation of the essentially axially extending layer of compound B, which in FIG Figures 5b, 7b is illustrated. In this subsection of the method, too, the introduction is preferably carried out by injecting a compound radially further outward, as can be seen from the ratio of FIGS. 1a, 2a from pairs of figures 1 and 2, applied to pairs of figures 5 and 7.

In FIGS. 5b and 7b, the second introduced layer of compound B does not extend any further than into the sealing zone of area 2, also designated 10D, after the flow movement caused by ring stamp 40 has ended. According to FIGS. 7b and 5b, the compound layer B extends only with its thickness in the groove area 20, 21, where the two compound layers overlap. The compound layer B extends into the area 2 a short axial distance and radially with its thickness, ie only slightly.

The thickness extensions of the first layer of compound A and the second layer of compound B are not constant, particularly recognizable in FIG. 5b, but also in 7b in the overlap area near the flow-blocking edge 41 of the stamp 40 as a circumferential boundary line.

Viewed the other way around, the compound A introduced first does not extend any further radially outward as a layer than the circumferential groove 21, that is to say not into the area 3, but rather narrowly limited to the area 2 as the sealing zone 10D of the sealing and sealing zone 10. The orientation in FIG essentially axially and essentially radially can be described as L-shaped according to FIGS. 5b and 7b, based on the axial section. In three dimensions, this corresponds to a cylindrical shape of compound B and an essentially flat ring shape of compound A. Minor deviations from this basic geometry can be found in the further exemplary embodiments in which the overlap zone is more clearly and directly arranged in the groove 20 or 21.

The pair of figures 9 shows a first introduction of a compound B after

Stamping method according to FIGS. 1. The stamp 40 is specially designed on the face side here and has an axially projecting web geometry 42 which extends into the circumferential groove 21 in the area 2 when the stamp has reached its uppermost axial position with respect to the compound B at the end of the deforming forming movement (in real production, the axial end position). The closure cover 1 is still the same, only the compound layer B lies radially in the circumferential groove to a certain extent and extends axially further into the area 2 than is shown, for example, in FIG. 5b. The flow movement radially inward is limited by the web 42 on the punch. The other intermediate steps of the method, in particular the injection of the compound near the apron 4, is as described above.

The web 42 is formed without sharp edges and rounded. The entire end face of the stamp 40 opposite the fuselage 40a has a continuously running surface. As a result, the inside of the sheet is not damaged on the one hand, and on the other hand, a gentle shape of the L-shaped leg is formed

Compound layer B, to which a layer A is placed according to the following figure.

An enlarged detail of the overlap area with stamp engagement 40 is shown in FIG. 17, enlarged from FIG. 7b. The groove which runs in a wedge shape there, with bevel 21b and radius of curvature 21a, takes up the first compound layer A. The second compound layer B has an overlap area D that extends in area 2. The engagement of the stamp shows that the locking edge 41 a further radial expansion inward during the flow and shape movement of the compound layer B prevented. The edge 41 merges into a strip-shaped, almost planar end section and leads into an inner section that slopes downward to the inner edge 43, which can run sharply or rounded. The stamp 40 is narrower with its end ring surface than in its fuselage section 40a. Its recess 46 pointing radially outwards reflects the shape and flow movement of the compound layer B.

From the enlargement of the detail it can be seen that the exclusion zone does not necessarily have to be an exact line, but can extend on a certain, also curved, annular surface piece. The entire front surface of the stamp 40 is not necessary for this blocking, as the wedge-shaped opening, which also runs as a ring, between the lower surface of the layer A and the front surface of the stamp 40 shows radially outside the inner edge 43.

This is followed by a method step to obtain the shape according to FIG. 9b, with which, in accordance with FIG. 2a, a preform of a compound is applied radially further inward during a rotary movement, here in the intermediate region between area and Area2, and its position and shape is changed by rotary movement ω1. Given the shape of the compound B in the circumferential groove 21, there is a complementary shape for the top layer of the compound A, which is clearly visible, forms an essentially horizontal overlap zone, and with a lower surface, pointing towards the inside of the lid, which is from the compound A is formed as a higher-quality compound. The area is still practically free of compound after it is only moved radially outwards by the rotary movement ω2.

Both compounds overlap in the groove area 21, no compound is provided radially within the area, and Area3 is only provided with compound B without any extension of the position of compound A.

FIGS. 11 are designed in the same way as the order in which the first introduced compound B is stamped and a compound layer A is formed by a rotational movement. The difference from FIGS. 9 is the shape of the circumferential groove 20, between the panel transition region 3a and the vertical apron 4. Here too, a circumferential, upstanding web 42 on the end face of the stamp 40 limits the flow movement radially inward by the flat Touches the bottom of the circumferential groove 20 in its axially uppermost position (in reality the axially lowest position). The complement and the remaining filling of the groove forms the second compound layer applied in the manner of the lining with the compound A. Also in this Training, the compounds extend essentially perpendicular to each other, with a given deviation in the overlap area from their main direction of extension, i.e. the compound B also extends slightly radially, while the compound A also changes in the thickness direction in such a way that one changes from an axial one Extent can speak. However, the main direction of extension in the axial direction for the compound layer B and in the radial direction for the compound layer A does not change this.

The stamp 40 is designed as described above with a soft inner surface 45, but the radially outer edge 41 'is not as strong and sharp as in FIGS. 5b, 7b. The upward-projecting ring web 42 takes on its task, so that the outer edge 41 ′ can be designed to be softer and clearly rounded.

In the embodiment according to FIGS. 16 and 20, the groove 20 has an initially flat bottom, according to the example in FIG. 4, in which a circumferential intermediate groove 20a is introduced. This intermediate groove can be introduced as a circumferential bead before the compound is introduced into the cover shell made of sheet metal. A combination groove 22 is formed, consisting of two mutually directed but concentric individual grooves 20, 20a, a so-called "double ring channel", on both sides of the intermediate groove 20a, which is of shallow depth and smaller width.

The intermediate groove takes on the task of limiting a flow movement of the first compound layer B introduced by the molded compound method, which essentially extends axially, at least solely in the "Area3" and clearly also into the "Area2", but radially delimited by the circumferential groove 20a.

The circumferential groove 20a is formed with a height (depth) which is less than the height (depth) of the circumferential groove 20, with reference to the distance between the lid level 3 and the flat bottom geometry of the circumferential groove 20. This allows the compound layer A 2 clearly extend into the "area 2" and extend beyond the circumferential barrier, in the manner of the lining according to FIGS. 2, to form the overlap zone with the compound layer B lying radially further outward in the groove 20. Here, too, the entire area with compound A occupied, which cooperates with the end face of the vessel rim in the closed state according to FIG. 3b. A comparison of the different pairs of figures and the different process results, using the two compound layers introduced one after the other, shows that the overlap zone in the area of the groove 20 or 21 is designed differently, which is due to the basic distinction between the axial extension and the radial extension of the respective compound layer , relative to their thickness extension perpendicular to them, does not change anything. The compound layer B extends more or less into the area 2 as the sealing zone 10D, but in the event of a greater extension into this area 2 it is in any case covered by the compound layer A, so that the sealing action with the vessel is always formed by the higher-quality compound A. This higher position does not extend radially beyond the extent of the circumferential groove. The farthest extent is according to FIG. 5b, the least extent is according to FIG. 9b or 16b, but sufficient enough to take over the sealing function by touching the edge of the vessel.

The area is practically free of compound. No compound is pressed radially into this area during application. This can prevent this area of the compound from coming into contact with food. It can also be avoided that the high-quality compound A of the compound layer A extends too far radially outwards and is thus involved in the closing task or such functions of the PT-type closure cover. The costs incurred for this compound can therefore be reduced if the chemical or physical design is of higher quality. The physical property of Compound B can be changed by causing this compound to be excessively bloated for the suitability of the closing function. The chemical and physical properties can be tailored precisely to the intended functional purpose. The same compound no longer has to perform several functions in order to be able to carry out its required properties in its entire radial and axial extent at the point required in each case. Rather, the different physical properties and chemical properties can be limited and limited to the area of the edge area R, and here the sealing and sealing zone 10, as 10D, 10V.

It should also be added that the compound preform, which is not shown in the pairs of figures 5, 7, 9 and 16, is ring-shaped, corresponding to the embodiment according to FIG. 1a. Instead, the exemplary embodiments are designed with compound B in the same form, which is shown as toroidal form C in FIG. 1a. This form is not found in the figures from FIG. 5, because it is already there due to the intervention of the stamp 40 are each shown deformed and shifted. The preforms are in the same shape as an annularly injected preform on the apron section 4, which is then deformed cylindrically by the recess 46, with an optionally radially inwardly projecting upper section according to FIGS. 9b, 11b and 16b.

The shaping stamp 40 is readily apparent in the engagement position in FIGS. 5b, 7b, 9a, 11a and 16a. It is designated by 40 and has a body 40a, below the lower end of the closure cap 1 (the lower rolled section 5}, and an end section which tapers sharply and is reduced to an area at the end which is narrower than the circumferential groove 20 , 21. Is a cylindrical

Edge recess is designated 46. It picks up the preform (the toroidal shape) of the compound B after its injection state and displaces and deforms it to form the cylindrical layer, which extends essentially only axially. Opposite the recess 46, a continuously extending surface 45 is provided, which connects the fuselage with the much narrower front end.

The formation of the end section can prevent compound B from shifting substantially in the radial direction. It is limited to a maximum possible, but not necessarily occurring displacement, which is significantly less than the axial displacement, which can be seen to the maximum extent in FIG. 9b. There the displacement in the radial direction is approximately 20% to 30% of the displacement in the axial direction. The minimal radial displacement is illustrated in FIGS. 5b and 7b, caused by a relatively sharp edge 41 at the radially outer end of the end face, which sharp edge is at an angle of between 90 ° to 120 °, as illustrated in FIG. 17.

The flow barrier through a protruding circumferential web 42 is arranged directly on the end face, for contacting interaction with the bottom of the groove 20 or 21, the radially outer edge 41 ′ then being more rounded than in the absence of the end web of the punch 40 according to FIG Figures 5b, 7b.

The radially inner end face 43 of the die 40 can be designed relatively freely. In any case, the flow of compound B does not reach this end, so that it cannot subsequently penetrate into the area which is to be kept free of compound. It also cannot penetrate to the actual sealing surface, which is formed by compound A, so that radial flow is also blocked in a substantial section of Area2. The lower (actually "upper") remaining section of the ring stamp, which is not shown in the figures, is known from the prior art and therefore need not be explained in more detail. It has a holding section and a drive mechanism to raise and lower the punch depending on the

Operating condition. The stamp can be actuated mechanically, e.g. done hydraulically or pneumatically. The stamp is actuated practically from above, although in the exemplary embodiments it is shown actuating from the bottom upwards in relation to the cover in its closed position.

In the intermediate figures not yet described, pairs of figures 6, 8, 10, 12, 14 and 15, a second stamp forming is also added, but the starting method steps are based on the exemplary embodiments which are shown on the same sheet and described above. A separate description is given below only for the pairs of figures 13 and 14, with reference to the use of the combination groove 22 (in short: combination groove) in a different radial locking direction than in the already described FIGS. 16.

The additional punch 50 which is used according to FIG. 6a serves to axially equalize the compound layer A that was first applied and shifted and deformed by rotation. In the illustrated wedge-shaped groove 21 with inclined surface 21b and radius of curvature 21a, a significantly flatter lower one results compared to FIG. 5a Surface when the first compound layer already introduced is reshaped with pressure through the end face 50b of the stamp 50. For this purpose, the stamp 50 itself has a lower (in reality upper) fuselage 50a, an outer surface 50c, essentially axially aligned as a cylinder and provided at a distance from the apron 4, and an inner, axially recessed strip shape 50d on the forehead which adjoins the inner end of the leveling surface 50b (in the region of the groove 21). The stamp 50 is designed to be substantially wider in the radial direction than the deformation stamp 40 for the second compound layer introduced according to FIG. 6b. This process step is identical to that of FIG. 5b.

The additional deformation of the first compound layer A results in improved adhesion in the circumferential groove, specifically in the region 21a. This section of the compound is then freed of any bubbles that may have formed, or the number of bubbles present is greatly reduced, which indirectly also contributes to the adhesion. Due to the stamping and the uniformity of the downward-facing (real upward-facing) surface, the connection and the overlap according to FIG. 6b, which starts from the end section of the axial compound layer B lying here, with better adhesion to the first sealant A be applied and adhere better here by the pressure of the stamp 40.

The lining process as the first process step is supplemented by a stamp pressurization process, as was previously only described for the second layer introduced. The advantages achieved have been described. The use of the second stamp 50 can also be used in a correspondingly modified form for those processes in which the compound A lying radially further inward is not introduced first, but secondly after the compound layer B lying radially further out and is then shaped. Such an embodiment can be found in the pairs of figures 10 and 12 to be described later.

Compared to the pair of figures 6, FIGS. 8a and 8b are designed differently in the same way as the difference between the pair of figures 7 and the pair of figures 5. The shape of the circumferential groove 20 is flat, compared to the wedge shape 21 according to FIG. 6. In addition, FIG. 8a to the further

Deformation stamp 50 also shows the strip area a2, in which the improved adhesion and the reduced proportion of bubbles is obtained. The transition between the leveling strip 50b, which applies pressure on the face side, and the inner strip 50d, which is set back in relation thereto, lies in the region 3a, in the transition between the cover mirror and the circumferential groove 20.

The method according to the pair of figures 10 also works with a double stamp forming.

In these FIGS. 10a, 10b, the method according to the pair of figures 9 is used, with the same first stamp 40 during the introduction of the compound B, which was introduced here first, in the compound layer B, which is essentially cylindrical. This is followed by a method step as it corresponds to FIG. 9b and is not shown separately in FIG. 10. This process step is followed by the process step represented in FIG. 10b of a further leveling of the compound layer lying radially further inwards, which is designed as layer A with the end face 51b of a further punch 51 on its lower surface and has a smaller axial extent. The axial Extension (thickness) is reduced on the outside, in order to even out at least the lower surface, in the direction of a substantially horizontal plane. In this case, a recess 51c is used on the radially outer side of the plunger 51 in such a way that this recess no longer influences the previously formed outer compound layer B, but at most is still there, but without any noticeable pressurization. The resulting overlap area is designed to be more flat with its underside compared to FIG. 9b and has better adhesion in the transition area between the two compound layers A, B, which can be seen from the different color design and has a slightly wavy and circumferential cross section. A radially outermost edge line a1 of the compound A located radially further inward is also made more uniform, for the outer edge 51d of the stamping tool 51. Despite the pressurization, the radially inner edge 51e in the transition area 3a between the two areas 1, 2 ensures that the leveled Compound A is not displaced into Area 1.

With the subsequent leveling according to FIG. 10b, the formation of a tip is also avoided in such a way that fraying of the radially outer edge line (at 51 d with reference to compound A) of the compound introduced second can be avoided or reversed. When leveling, the first Compound A is still flowable in order to be able to yield under the pressure load and to reduce bubbles and improve adhesion.

The figure 12 also illustrates an equalization of the radially outer edge line of the compound A lying radially further inward, here along the line a1 in FIG. 12b. Proceeding from the method according to the pair of figures 11, the further punch 51 is used to level the compound layer A, whereby at least three effects are achieved which have already been mentioned. Better adhesion in the overlap region a3 than a wavy line in cross section, which extends circumferentially, and in which bubbles are also expelled when pressure is exerted by the punch 51. In the same area, the adhesion between the two compound layers A and B also improves. Avoiding fraying along the circumferential line a1 is a further effect of the leveling with the stamp 51. The method step of FIG. 11b must also be interposed in the case of the pair of figures 12a, 12b able to bring the compound in position A and to shape and shift it by a rotational movement. The result obtained is that of FIG. 11b, which is leveled according to FIG. 12b, with the end face 51b of the stamp 51. The radially outer recess 51c of the plunger 51 is more clearly exposed compared to FIG. 10b without touching the essentially cylindrical compound layer B during the post-forming.

The pair of figures 15 is based on the manufacturing process of the pair of figures 16. Here, too, there is post-deformation in the sense of leveling with a second stamp 51. Here too, FIG. 16b is to be added as an intermediate step between the method steps of FIGS. 15a and 15b. Otherwise, the manufacturing method according to FIG. 16 can be transferred to the exemplary embodiment of FIGS. The groove 22 is designed here as a combination groove, in accordance with the description of FIG. 16a. The effects of better adhesion in the overlap area a3 and the avoidance of lump formation along the edge line a1 of the compound A lying radially further inward are also achieved here with the stamp post-deformation. The position A is level and in the axial direction is evened over the comparative example in FIG. 16b, in which no additional leveling step was used.

A separate description of a method is to be given for FIGS. 13a to 14b.

The shape of the circumferential groove 22 is as explained with reference to FIG. 16a. A combination groove 22 is provided which, with the inner circumferential bead 20a, at least impedes a preform introduced by the lining method according to FIG. 2a during its deformation by rotation in its further spreading movement. Depending on the amount of compound A introduced, depending on the size of the speed and depending on the depth of the bead 20a, there is a more or less strong blocking effect, but this need not be complete, as shown in the illustration in FIG. 13a. There remains a residual space in the circumferential channel 20 for receiving the second compound to be introduced later, so that a clear blocking effect can be seen, but the circumferential bead 20a does not completely block the radial outward displacement of the compound A. Excessive radial expansion of the first compound during radial displacement by centrifugal force (from the rotation according to FIG. 2b) is hindered.

FIG. 13b shows a subsequent method step, or the stage at which several intermediate method steps are completed in accordance with the

Figures 1a, 1b and an introduction of the punch 40, which causes the first deformation of the compound B in the substantially cylindrical position. It can be seen that the interface between the two compound layers A, B in the overlap region has a different curvature than, for example, in the embodiment according to FIG. 15b with the same combination groove 22.

The axial thickness of the inner compound layer A tapers towards the groove base 20 in FIG. 13b. In Figure 15b, the axial thickness of the compound layer A tapers to the exposed sealing surface and to the edge line a1.

All the stamps 50 described have a fuselage section 50a and are cut axially and shown in the cutout. In the remaining area they are designed in the same way as stamps with a drive and a holder are usually designed. The same applies to the punches 51, which also have a fuselage section 51a and a leveling surface 51b.

FIGS. 14a and 14b have a differently shaped overlap zone of the two compound layers according to FIG. 14b, here essentially running obliquely with a conical surface that runs past the inner, smaller peripheral bead 20a and has an angle of essentially 45 ° with respect to the horizontal , It results from the shape of a channel 55 of the first deforming plunger 52 according to FIG. 14a, the end edge web 54 of which is designed in such a way that its end faces radially outside the smaller peripheral bead 20a to the bottom of the

Main groove 20 arrives and has a blocking effect here on the further radial expansion of the compound layer A introduced first. It has been applied, as illustrated in FIG. 2a, but does not necessarily have to be deformed by rotation, but it can.

An additional post-deformation after a rotation shift forms the lower surface of this first introduced compound layer A almost flat, which is defined by the bottom shape of the recess 55. A better linear adhesion is achieved in area a3. Bubbles that have formed are also reduced by the additional deformation step with the stamp 52a. This stamp 52a has a fuselage section 52a opposite the circumferential recess 55, a continuously extending inner wall surface 56 and an outer recess 53, which comes to lie opposite the apron 4, in the illustrated engagement state of the axial pressure application.

The second compound layer B subsequently introduced according to FIG. 14b corresponds to the introduction according to FIGS. 1a, 1b, with a displacement and deformation of the compound to the extent shown and adjacent to the inclined surface of the first Compound layer A, as it left the recess 55 with its edge web 54 after the punch 52 had been moved out.

The deforming stamp 40 corresponds to that of FIG. 13b, or also approximately those stamps of FIGS. 7b, 8b, only with a somewhat wider end face between the two circumferential edges 41, 43.

FIG. 18 illustrates an enlarged detail from FIG. 13b described above. Here, the combination groove 22 is shown more clearly and the upward tapering thickness of the radially further inward

Compound layer A, to which compound layer B borders in an overlapping manner in boundary region D as the boundary surface.

When the plunger 40 engages in the area of its forehead formation 42 'and its outer peripheral edge 41b, a tapering of the compound layer B tapers inwards. This tip ends at the protruding ring elevation with its highest point 42', which defines a boundary line in a line, beyond which the compound B cannot get beyond its deformation and displacement, that is to say is blocked with regard to its radial inward movement. In a corresponding application and effect, the web-shaped design 42 according to FIG. 11 a was also designed in such a way that a lock for an inward deformation of the compound layer B results.

The end face of the punch 40, which is essentially wedge-shaped in cross section, has this blocking zone with its highest line 42 ', touching the compound A lying radially further inward. The radially inner edge line 43 of the punch 40 is then not required for blocking purposes of the compound flow.

* A V ♦

Claims

Expectations:

1. A method for forming a sealing and sealing zone (10; 10V, 10D) provided with a compound (A, B) in a sealing lid (cap; 1) made of essentially metallic material, two insertion processes for two compound layers being used in succession for Introducing a first compound (A) and introducing a second compound (B), which two compounds are preferably not the same; - Both compound layers (A, B) extend into different geometrical areas (Area2, Area3) of the sealing cover in its edge area (R) with sealing and sealing zone (10D, 10V).

2. The method according to claim 1, wherein the first introduction method is a lining method, with an injection of the first compound (A) into a circumferential path, (i) without mechanical post-forming by means of a ring stamp having an effect radially inwards; and / or (ii) with a rotation of the closure cover and a resulting displacement effect on the injected compound (A) radially outward.

3. The method according to claim 1 or claim 2, wherein the second introduction method is a molding method in which an introduced, in particular injected on a circumferential path, second compound (B) is initially placed during introduction and then at least with a stamp (40) is deformed in a sealing zone (10V) of the sealing and sealing zone (10) of the cover.

4. The method according to claim 3, wherein the second introduction method as a molding method first places the introduced second compound (B) during introduction and, as a result, also deforms with a stamp (40) into a section of the sealing zone (10D) of the cover, but deforms it not further.

5. The method according to claim 3 or 4, wherein during the deforming displacement of the second compound (B) an annular barrier acts so that a radially inward flow movement of the second compound (B) is limited to not further than in a sealing zone ( Area2) to extend after completion of the flow movement caused by a ring stamp (40).

6. The method according to claim 5, wherein the annular lock on the ring stamp (40) is arranged on the end face, in particular as a circumferential edge (41) or - from an end face of the ring stamp - ring elevation (42, 42 ').

7. The method according to claim 5, wherein the annular lock on the closure cover (1) is arranged as an annular groove (20a) in a circumferential groove (20) which is located outside the radially outer edge (3a) of a cover mirror (panel; 3) , to form a combination groove (22; 20a, 20).

8. The method according to claim 1, wherein the sealing zone (10D) and the closure zone (10V) are provided for sealing to a vessel edge and for mechanically rotating unscrewing of at least threaded segments on the vessel edge and correspondingly geometrically on the closure lid (1) in its edge region (R). are located, which has: • an edge (3a) of a cover mirror (3); • a substantially axially extending skirt (4); • a circumferential groove (2; 21, 20, 20a, 22) radially outside the mirror edge (3a).

9. The method according to claim 7 or 1, wherein the two compound layers (A, B) overlap, in particular in the region of a circumferential groove (20, 21; 22) in the edge region (R).

10. The method according to claim 1 or claim 2, second alternative, wherein with a further punch (50,51), the introduced and radially displaced first compound (A) is pressurized in order to equalize its axial extent.

11. The method according to claim 10, wherein a radially outermost edge line (a1) of the radially further inner first compound (A) is made uniform during the pressurization.

12. The method according to claim 10 or 11, wherein in a strip area (a2, a3), near the outer edge (a1) of the radially further inward first compound (A), one under the pressure load by the further stamp (50,51) Adhesion and / or a reduction in bubbles of the still flowable first compound (A) is favored.

13. The method according to claim 1, wherein a further punch (52) has a circumferential recess (55) on its end face, for channel formation in a pressure-exerting state, for limiting a radial extension and for pressing on the still flowable first compound (A), before the second compound (B) is introduced.

14. Lid for closing a container, preferably as a PT lid, for closing with axial pressure (P closure), and for opening with a rotating action (T opening), the lid having an edge area (10V) for at least the mechanical one Hold radially outside of a circumferential groove or a circumferential channel (21, 20; 2) and the cover is provided with two compound layers (A, B), with (a) the two layers overlapping in the region of the circumferential groove (20,21) , wherein the radially further placed compound (B) does not extend radially inward over a radially innermost end of the circumferential groove; or (b) the radially innermost compound layer (A) does not extend further radially outward than a radially outer end of the groove (20, 21); or (c) one of the two compound layers (A, B) extends substantially axially and the other of the two layers extends essentially radially, each of the two layers having a non-constant thickness along its main extent.

15. Lid according to claim 14, alternative (c), wherein the "substantial extension" of each layer is a main direction of extension and this main extension of a respective layer is substantially larger than another, orthogonal to the same layer.

16. Lid according to claim 14, which has any combination of feature groups (a) to (c).

17. The lid of claim 14, wherein the groove (20) has a bottom surface that is substantially horizontal or flat.

18. Lid according to claim 14, wherein the groove (21) is a bottom surface which is provided with a rounded bottom portion, which has an annular zone with a - in a circumferential direction - orthogonally oriented radius of curvature (21a) and radially within the rounded bottom portion inclined portion (21b).

19. Lid according to claim 14, wherein the two compounds (A, B) in the two layers differ from one another in their chemical and / or physical properties.

20. Annular form stamp (40) for deformation and displacement of a compound preform in an essentially cylindrical compound layer of a closure zone (10V), a sealing and closure zone (10) of a closure lid in its edge region (R), with which change as deformation and displacement of the compound preform as a compound (B) applied to a skirt area (4, Area3) of a closure cover (1) substantially only in the axial direction and in the radial direction at most to an extent that is significantly less than the extent of the axial change in the preform of the compound, the ring punch (40) having (i) a body section (40a) and an axially adjoining front section (41, 42, 43), which front section is (substantially) narrower than the body section ; wherein (ii) the ring stamp (40) radially on the outside an - axially extending - circumferential recess (46) for receiving and changing the position and shape of the preform of the applied compound (B) in the apron area (4, Area3) of the closure cover (1) having; (iii) the end section is designed as a lock (41, 42, 42 ') in order to block a flow of the compound (B) of the compound preform radially inward beyond a radially inner end (43) of the end section during the change.

21. Stamp according to claim 20, wherein the lock is designed as a radially outer, sharp peripheral edge (41).

22. Stamp according to claim 20, wherein the lock is designed as a ring web (42) arranged on an end face of the end section or a substantially wedge-shaped protruding ring elevation (42 ').

23. Stamp according to claim 20, wherein the ring stamp (40) widens from the end section (41, 42, 43) along at least the axial extent of the annular circumferential recess (46), essentially continuously (45) to the fuselage section.

24. The method according to claim 13, wherein an edge web (54) of the recess (55) cooperates with an annular groove (20a) in a wider circumferential groove (20) to limit a radial extent of the first compound (A).

25. The method according to claim 13, wherein an annular lock on the closure cover (1) is arranged as an annular groove (20a) in a circumferential groove (20) which is located outside the radially outer edge (3a) of a cover mirror (panel; 3) , to form a combination groove (22; 20a, 20), the annular groove at least preventing the radial expansion of the first compound (A) during radial displacement.

26. The closure lid (1) for a method according to claim 1, wherein a sealing zone (10D) and a closure zone (10V) are provided for sealing to a vessel edge or for mechanically rotating unscrewing at least thread segments on a vessel edge (90) and the zones are correspondingly geometrically located on the closure cover (1) in its edge region (R), the closure cover having an edge (3a) of a cover mirror (3); a substantially axially extending skirt (4,5); s a circumferential groove (20) radially outside the edge (3a) of the cover mirror; wherein an annular lock is arranged in the circumferential groove (20) as an annular groove (20a), which is located outside the radially outer edge (3a) of the cover mirror (3), to form a combination groove (22; 20a, 20).

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