DE102014007121A1 - Container of thermoplastic polymer and method for producing such a container - Google Patents

Abstract

The invention relates to a container made of a thermoplastic polymer having at least one accessory arranged inside the container, which has been connected to a container wall (12) during the molding of the container, the accessory having at least one attachment foot (4) having a contact surface (14). with the container wall (12), wherein the contact surface (14) is in contact with the container wall, the fastening foot has at least one welding stud, the welding stud is integrally formed on the mounting foot (4) or the welding stud has an opening (8) of the mounting foot ( 4), the welding stud is made of a thermoplastic polymer which is compatible with the thermoplastic polymer of the container wall (12), the welding stud is inserted in the container wall (12) and welded to the container wall in the area of the penetration and wherein the welding stud has a Form the anchoring head (11) t, the anchoring head (11) is widened at an end remote from the contact surface of the welding pin or the anchoring head (11) is provided with a circumferential undercut, such that the anchoring head (11) by the thermoplastic polymer of the container wall (12) is embraced ,

Description

The invention relates to a container made of thermoplastic polymer with at least one arranged inside the container accessory which has been connected to a container wall during the formation of the container.

The invention further relates to a method for producing such a container.

A container of the aforementioned type is for example from the US 8,608,011 known.

A generic container and a method for its production is also known from EP 2 328 739 B1 known.

From the DE 10 2010 032 279 A Applicant is aware of a method of riveting an accessory to a plastic fuel container during manufacture of the container. On the DE 10 2010 032 279 is hereby incorporated by reference, also for the purpose of disclosure. This document relates to a method of riveting an accessory to a plastic fuel container, wherein rivet attachment occurs at the time of manufacture of the container by extrusion blow molding of a split tubular preform or two thermoplastic sheet-like extruded preforms using a multi-part mold after or during formation of two complementary shells wherein the accessory is provided or provided with at least one opening, wherein the method is characterized in particular by the fact that the riveting is carried out by means of at least one prefabricated rivet pin made of thermoplastic material, which was obtained in a separate manufacturing process and permitting the opening of the accessory with the container wall is welded.

This method as well as from the US 8,608,011 B2 Known methods of attaching an accessory to the wall of a container obtained by extrusion blow molding differ from that of, for example, US Pat EP 1 773 570 B1 Known method that provided for attachment of the accessory rivet or the purpose intended rivet pin was not formed from the molten material of the container wall. In the method according to EP 1 773 570 B1 is intended to melt at least a portion of the plastic from which the wall of the container consists, and to press a portion of the molten plastic through the opening of the accessory, without being detached from the rest of the exiting plastic and the projecting molten plastic a corresponding shape to give a self-forming Kunststoffniet.

This method has the disadvantage that the formation of the rivet head during the introduction of the accessory into the fuel tank is relatively expensive to accomplish. In addition, a check on whether the rivet head rivet head is complete and correct, hindsight difficult.

In the US 8,608,011 B2 For example, in a similar method of manufacturing a fuel tank, it is proposed to provide the accessory to be introduced into the fuel tank with a plurality of mounting feet, each integrally welded to welding pins, the welding pins consisting of a plastic compatible with the wall of the fuel tank for weldability. These welding pins have either a cylindrical or elliptical cross-section and form a welded connection with the preform or with the container wall when joining the accessory with the mounting feet against the wall of the preform. The weld studs have a height that is about 30 to 70% of the thickness of the outer wall of the fuel tank and protrude from the contact surface of the mounting feet of the accessory accordingly.

A large number of welding studs on the respective mounting foot can be used to achieve an intimate welding of the mounting foot to the container wall.

In the manufacture of the container according to US 8,608,011 B2 is provided to make the welding of the mounting foot with the container wall so that the introduction of impact-induced deformation forces in the container wall in the region of the weld can not lead to a violation of the container wall. That is why in the US 8,608,011 B2 proposed to form the welding pin with a relatively low shear capacity, so that the welding pin initially yield and destroyed upon initiation of appropriate deformation forces in the container wall. For this reason, in the US 8,608,011 B2 proposed to make the welding pin starting from the contact surface of the mounting foot with decreasing cross-section or tapered or tapered. This has, among other things, the advantage that the penetration of the welding pin into the warm plastic wall of the preform is facilitated in the formation of the container.

The Applicant has found that the tensile strength and shear strength of the in US 8,608,011 B2 suggested attachment of the accessory may not be sufficient, especially if relatively large accessories are to be attached to the container wall. The connection according to US 8,608,011 B2 Although it is advantageous if shear stress occurs, the tensile strength of such a connection, that is, the load capacity in the longitudinal direction of the welding pins, may not be sufficient.

This problem also arises in the rivet fastening method DE 10 2010 032 279 A ,

The Applicant has found that this problem can not be taken into account by the fact that the immersion depth of the rivet pin or the welding pin in the container wall or in the preform which forms the container wall is increased. This is impractical and desirable for a variety of reasons since, for example, when forming the container from a multilayered polymer having a barrier layer for hydrocarbons, there is a risk that the weld pin will break the barrier layer of the container wall.

In the EP 2 328 739 B1 Therefore, in order to increase the tensile strength of the connection of the accessory on the one hand, it is proposed to connect the accessory to the container wall both according to the aforementioned "in situ riveting method" and to equip the accessory with corresponding welding pins.

In this way, although the tensile strength of the welded joint is increased, but results for the formation of the riveted from the molten plastic container wall, the above-described problem that a subsequent check whether the rivet head of the rivet fastening is completely and correctly formed relatively difficult and that under certain circumstances, a deformation of the rivet head with an additional tool is required. In addition, it is relatively difficult to influence the flow behavior of the molten plastic of the container wall through the opening of the accessory.

The invention is therefore based on the object to provide a container and a method for producing the container, wherein the container is improved in terms of stability of the connection of the accessory and the method is improved in terms of practicality and process reliability.

The object is achieved by a container having the features of claim 1 and by a method having the features of claim 8. Advantageous embodiments of the invention will become apparent from the dependent claims.

According to one aspect of the present invention, there is provided a thermoplastic polymer container having at least one accessory disposed within the container which has been joined to a container wall during formation of the container, the accessory comprising at least one mounting foot having a contact surface with the container wall wherein the contact surface is in contact with the container wall, the fastening foot has at least one welding pin protruding from the contact surface, the welding pin is integrally formed on the fastening foot or the welding pin passes through an opening of the fastening foot, the welding pin consists of a thermoplastic polymer, which is compatible with the thermoplastic polymer of the container wall, the welding pin is inserted into the container wall and is welded to the container wall in the region of the penetration and wherein the welding pin forms an anchoring head and the anchoring head is spread at an end remote from the contact surface of the welding pin or the anchoring head is provided with a circumferential undercut, such that the anchoring head is embraced by the thermoplastic polymer of the container wall.

Surprisingly, it has been found that such a connection of the accessory unites both the advantages of a welded joint and the advantages of a positive connection of the accessory with the container wall in it. Due to the fact that in the joining direction, the leading end of the welding pin is formed as a common anchoring head, both a welding of the plastic of the welding pin is achieved with the plastic of the container wall, in the sense that a mutual penetration of the molecules of the polymers is achieved as well as a positive anchoring, since the anchoring head of the welding pin is also embraced form-fitting after cooling and solidification of the compound, resulting in a high pull-out resistance for the welding pin.

Such a connection can also be designed in an advantageous manner so that the welding pin shear off when corresponding shear forces are exceeded, this can be ensured in particular by the fact that the relevant welding pin is formed at the root or in the root area with the contact surface with a relatively small cross-section who defined a Shearing possible when exceeding certain shear forces.

In the context of the invention, one or more welding pins can be provided on the mounting foot. Preferably, a plurality of welding pins is provided.

The weld pin may be an integral part of the mounting foot or, as mentioned above, inserted or injected into an opening of the mounting foot.

The container wall of the container is preferably made of a thermoplastic polymer based on HDPE. The container wall can for example consist of a multilayered polymer with at least one barrier layer for hydrocarbons.

For the purposes of the present invention, an accessory is to be understood as meaning valves, delivery units, surge installations, level sensors, ventilation lines or the like.

The attachment foot of the accessory may be made of a polyolefin or a polyamide. In particular, the accessory and / or the mounting foot may consist of a POM, a PA, a HDPE or an ABS.

The welding pin is preferably made of a HDPE, which is welded to the HDPE of the container wall.

The welding pin can, for example, as a prefabricated rivet pin in the sense of DE 10 2010 032 279 A the applicant, to which express reference is made in this regard for the purpose of disclosure.

The mounting foot may be formed as an integral part of the accessory or as a so-called "crown", which is locked with the accessory, which thus forms a receptacle for the relevant accessory.

In a preferred variant of the container according to the invention, the welding pin is designed as a rivet pin, which is inserted into the opening of the Befungsigungsfußes, wherein the rivet pin has a widened rivet head, which abuts against the side facing away from the contact surface of the opening, as such in the DE 10 2010 032 279 A is described.

The rivet pin may for example have been used captive in the opening or used. The rivet pin may have been obtained, for example, in a separate manufacturing process. Separate in this sense means that the rivet pin on the accessory was already provided during the manufacture of the accessory or before its provision for assembly and not just with the shape of the container.

It is particularly advantageous if the foot element has a plurality of welding pins, for example three or more.

In a particularly preferred embodiment of the invention, the anchoring head is conically widened or conically undercut.

Alternatively, the anchoring head may be formed as a so-called mushroom head, whose leading end has a radius and is rounded, or convex.

• a) Extrudieren eines schlauchförmigen Vorformlings aus einem thermoplastischen Poylmer sowie Teilen des Vorformlings in wenigstens zwei Bahnen oder
• b) Extrudieren zweier bahnförmiger Vorformlinge,
• c) Einbringen der Vorformlinge in ein geöffnetes Blasformwerkzeug mit zwei jeweils eine Kavität aufweisenden Außenformen und einem zwischen die Außenformen verbringbaren Zubehörträgern,
• d) Anordnen wenigstens eines Zubehörteils auf den Zubehörträger, wobei das Zubehörteil wenigstens ein Befestigungsfuß aufweist, der eine Kontaktfläche aufweist, der Befestigungsfuß wenigstens einen Schweißzapfen aufweist, der aus der Kontaktfläche hervorsteht, der Schweißzapfen an seinem von der Kontaktfläche abstehenden Ende einen verbreiterten oder hinterschnittenen Verankerungskopf aufweist und der Schweißzapfen aus einem mit dem Polymer der Vorformlinge kompatiblen Polymer besteht,
• e) Anlegen der Vorformlinge an die durch die Kavitäten definierte Kontur des Blasformwerkzeugs,
• f) Fügen des Zubehörteils an ein schalenförmiges Zwischenerzeugnis derart, dass der Schweißzapfen in dem betreffenden warmplastischen Vorformling eindringt und
• g) Fügen der schalenförmigen Zwischenerzeugnisse zu einem Behälter.

A further aspect of the invention relates to a method for producing a container, preferably a method for producing the container described above, comprising the following method steps:

• a) extruding a tubular preform from a thermoplastic polymer and dividing the preform in at least two webs or
• b) extruding two sheet-like preforms,
• c) introducing the preforms into an open blow molding tool having two outer molds, each having a cavity, and an accessory carrier that can be moved between the outer molds,
• d) arranging at least one accessory on the accessory carrier, the accessory having at least one attachment foot having a contact surface, the attachment foot having at least one welding stud protruding from the contact surface, the welding stud having a widened or undercut anchoring head at its end projecting from the contact surface and the welding pin consists of a polymer compatible with the polymer of the preforms,
• e) applying the preforms to the contour of the blow molding tool defined by the cavities,
• f) attaching the accessory to a cup-shaped intermediate product such that the welding pin penetrates into the relevant hot-plastic preform and
• g) adding the cup-shaped intermediate products to a container.

The process steps a) to g) are preferably carried out in the order in which they are mentioned, however, step d) can take place at any time between step a) and e). Intermediate steps are possible.

Both the container and the method according to the invention have the advantage that by virtue of the formation of the leading end of the welding pin, either conically widening and / or undercut and / or mushroom-shaped, a secure positive anchoring of the respective welding pin in the container wall with simultaneous Welding is achieved. Contrary to initial fears, the material displaced by the widened anchoring head when it penetrates into the container wall immediately overflows the anchoring head again, so that the desired effect occurs. In addition, the joining forces required for this purpose, contrary to an original other assumption, are within reasonable limits.

The joining of the accessory or of the attachment feet of the accessory can be done both statically and dynamically in the method. Under a static joining in this sense, it is understood that the joining takes place taking advantage of the closing movement of the tool, wherein the accessory remains stationary on the accessory carrier. A dynamic joining in this sense is to be understood that the accessory is arranged by means of appropriate actuators adjustable or movable on the accessory carrier, for example, after a complete or partial closing of the tool, the accessory can be actively moved in the direction of the container wall. Combinations of these variants are also within the scope of the invention.

The joining or welding is preferably carried out by utilizing the heat of extrusion of the preforms, that is in the partially molded into shell-shaped intermediate products preforms in still warm plastic or hot plastic state of the preforms.

In a variant of the method according to the invention it is provided that the welding pin is used as not integrally formed with the mounting foot rivet pin in an opening of the mounting foot, such as, for example, in the DE 10 2010 032 279 A is described.

The welding pin can be pressed into the preform, for example, by means of a punch arranged on the accessory carrier or an abutment. If the introduction of the welding pin by means of a punch, this is preferably active or dynamic, when using an abutment this can be done passively in the sense of a static joining.

Conveniently, the welding pin is captively inserted into the opening of the accessory, for example, this can be caught as a rivet pin with the integrally molded rivet head on the one hand and with the widened anchoring head on the other hand in the corresponding opening of the accessory. This may have been snapped into the opening with elastic deformation of the material of the rivet pin or welding pin. For this purpose, it can be provided, for example, that the welding pin is slotted, and that lengthwise, so that it can be inserted under appropriate deformation in the opening.

Alternatively, the welding pin may have been injected into the opening of the accessory or into the opening of the attachment foot of the accessory. In this case, it is advantageous if the fastening foot consists of a polymer which can not be welded to the preform. Preferably, the mounting foot is made by injection molding a first thermoplastic polymer and the rivet pin of a second thermoplastic polymer is injected into the opening of the mounting foot, wherein the first thermoplastic polymer is not compatible with the second thermoplastic polymer.

For this purpose, for example, the accessory or the mounting foot may have been inserted as an insert in an injection mold.

The container according to the invention as well as the method according to the invention also include the use and provision of a fastening foot with integrally formed welding pins. In this case, the mounting foot is advantageously formed of a thermoplastic polymer that is compatible with the polymer of the container. Compatible in this sense means weldable.

The invention will be explained below with reference to an embodiment shown in the drawings.

Show it:

1 : an exploded view of an accessory according to the invention,

2 : a view of the attachment foot of the accessory,

3 : the detailed view III in 1 with a first variant of the welding pin / Nietstifts according to the invention and

4 : A view of a second variant of a welding pin / Nietstifts according to the invention.

For the sake of simplicity, the method for producing the container according to the invention will first be explained below. The container itself is not shown in the drawings. This may be formed, for example, as a fuel tank for a motor vehicle, but alternatively, this may be formed as a urea container, wiper water tank or other operating fluid container for a motor vehicle.

The process according to the invention first provides for the continuous extrusion of two thermoplastic thermoplastic sheet-like preforms extruded between the opened halves of a three-part blow molding tool, first between each blow mold half and a tool divider / sealing frame disposed between the blow mold halves. In a further method step, the blow mold halves are closed against the tool divider arranged between them with the preforms being interposed. Superimposed on this closing movement of the blow mold halves is a movement of a machine base frame of the blow molding machine under the extrusion head. The mold cavity of the blow molding tool is closed, wherein the tool divider arranged between the blow mold halves seals the cavity of the blow molding tool. The preforms are then placed in the cavities of the blow mold halves using vacuum and / or overpressure and formed into shell-shaped intermediate products.

In a further method step, the blow mold halves are opened again. An accessory carrier equipped in the meantime with an accessory is placed between the blow mold halves, then the blow mold halves are closed again, during or after the closing of the blow mold halves the accessory is joined to the still warm plastic cupped intermediate products.

Alternatively, the method may be performed without using a tool splitter. The accessory carrier may be formed, for example, as a center tool. In this case, an initial or first closing of the blow mold halves takes place against the accessory carrier as a center tool, wherein the accessory is thereby joined against the molded in the cavities cup-shaped intermediate products.

Such an accessory is for example in 1 shown in an exploded view. The accessory is as an operating bleeder valve 1 formed, this includes a valve housing 2 with a nipple 3 For connection to a vent line and a mounting foot 4 as so-called "crown", with the valve body 2 about locking tongues 5 which engage in corresponding recesses 6 dive in, be clipped / locked.

The mounting foot 4 the service bleed valve is equipped with three mounting ears 7 provided, each with an opening 8th exhibit. The opening 8th is designed as a countersunk, circular hole and takes a rivet pin 9 as a welding pin, a countersunk head 10 with one of the depression of the opening 8th has corresponding contour.

The rivet pin 9 is made of a thermoplastic polymer and was preformed by injection molding and into the opening 8th of the mounting foot pressed or injected. The mounting foot 8th may for example consist of a POM, whereas the rivet pin 9 can consist of a HDPE.

The rivet pin 9 is at the in 3 shown variant of the connection of the mounting foot 4 with the with 12 designated container wall with a cylindrical cross-section shaft 13 provided, the circular in cross-section opening 8th in the mounting foot 4 interspersed.

The leading end of the rivet pin 9 which is in the container wall 12 is immersed and anchored in this is as a conical anchoring head 11 formed, which completely into the container wall 12 is embedded and the polymer of the container wall 12 is encompassed. The anchoring head 11 is from a contact surface 14 of the mounting foot 4 starting in the direction of the container wall 12 widened, so that this form-fitting of the polymer of the container wall 12 is encompassed. In addition, the rivet pin 9 in the area of its enclosure through the container wall 12 with the container wall 12 welded.

In the 3 The connection shown is achieved in that when joining the accessory, in the present case of the operating vent valve 1 , to the container wall 12 the mounting foot 4 with the rivet pin arranged therein 9 so with the container wall 12 is brought into contact with that of the contact surface 14 protruding anchoring head 11 of the rivet pin 9 in the still warm plastic polymer of the container wall 12 dips, is welded with this and is surrounded by it. This is the rivet pin 9 held for example with a punch, not shown, or with an abutment, not shown, on the accessory carrier in a deployed position.

The length of the rivet pin 9 is chosen so that the projection of the rivet pin 9 over the contact surface 14 about 30 to 70% of the thickness of the container wall 12 equivalent.

As mentioned above, the rivet pin 9 in the manufacture of the mounting foot 4 be injected into this, for example, the mounting foot 4 have been used for this purpose as an insert in an injection molding tool.

The rivet pin 9 preferably consists of a HDPE (high-density polyethylene). The container wall 12 , which may be formed, for example, as a multilayer extrudate consists at least predominantly of HDPE or comprises at least some layers of HDPE and is therefore with the rivet pin 9 weldable. In this case, the mounting foot 4 from one not with the container wall 12 Compatible polymer exist. Basically, it is possible that the mounting foot 4 also made of a metal or other material, which with the container wall 12 is not weldable.

For reasons of simplicity, the multi-layeredness of the container wall 12 not shown. From the inside to the outside, the container wall 12 For example, an HDPE inner layer, a recycled layer, two primer layers, an EVOH barrier layer, and a HDPE outer layer.

When using a mounting foot 4 made of HDPE, the rivet pin 9 integral with the mounting foot 4 be educated. It will be apparent to those skilled in the art that in this case the stem 13 and the anchoring head 11 directly to the contact surface 14 attach and stand out from the mounting foot.

An alternative embodiment of the rivet pin 9 is in 4 shown. Instead of a conical anchoring head is the rivet pin 9 with a countersunk head 10 , an adjoining cylindrical shaft 13 and at its far end with a mushroom head 15 provided, of the countersunk head 10 leaving end has a radius and convex, wherein the mushroom head 15 a larger diameter than the shaft 13 so that this as well as the conical relative to the shaft 13 widened anchoring head 11 in the direction of penetration into the container wall 12 forms an undercut, a positive anchoring with the polymer of the container wall 12 forms.

In the illustrated embodiment, the operating vent valve 1 with a removable and lockable mounting foot 4 Mistake. Basically, the mounting foot and the service bleed valve 1 be designed as an accessory also in one piece.

The with rivet pins 9 equipped operating bleed valve 1 or with rivet pins 9 equipped mounting foot 4 is at the molding of the container over the openings 8th passing rivet pins 9 with the container wall 12 welded, with the rivet pins 9 by means of one or more suitable tools in the openings 8th be held or pushed out of these and in the still warm plastic or melt-hot inner layer of the container wall 12 be driven so that the anchoring head 11 and the shaft 13 the rivet pins 9 with the container wall 12 merge and so that after curing the container wall 12 an intimate connection between the rivet pins 9 and the container wall 12 arises.

LIST OF REFERENCE NUMBERS

1

Operating vent valve

2

valve housing

3

nipple

4

Mounting foot

5

locking tongues

6

recess

7

mounting ears

8th

opening

9

Nietstift

10

countersunk

11

anchoring head

12

container wall

13

shaft

14

contact area

15

mushroom head

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 8608011 [0003]
• EP 2328739 B1 [0004, 0014]
• DE 102010032279 A [0005, 0012, 0027, 0029, 0039]
• DE 102010032279 [0005]
• US 8608011 B2 [0006, 0008, 0010, 0010, 0010, 0011, 0011]
• EP 1773570 B1 [0006, 0006]

Claims (13)

Container of thermoplastic polymer with at least one inside the container arranged accessory which with a container wall ( 12 ) was connected during the molding of the container, wherein the accessory at least one mounting foot ( 4 ) having a contact surface ( 14 ) with the container wall ( 12 ), wherein the contact surface ( 14 ) with the container wall ( 12 ) is in contact, the mounting foot ( 4 ) has at least one welding stud, which from the contact surface ( 14 protruding), the welding pin in one piece to the mounting foot ( 4 ) or the welding pin has an opening ( 8th ) of the mounting foot ( 4 ), the welding pin is made of a thermoplastic polymer, which with the thermoplastic polymer of the container wall ( 12 ) is compatible, the welding pin in the container wall ( 12 ) is inserted and with the container wall ( 12 ) is welded in the region of the penetration, wherein the welding pin has an anchoring head ( 11 ) and the anchoring head ( 11 ) at one of the contact surface ( 14 ) widened end of the welding pin or the anchoring head ( 11 ) is provided with a circumferential undercut, such that the anchoring head ( 11 ) of the thermoplastic polymer of the container wall ( 12 ) is embraced. Container according to claim 1, characterized in that the mounting foot ( 4 ) is formed as a component locked with the accessory. Container according to one of claims 1 or 2, characterized in that the welding pin as a riveting pin ( 9 ) formed in the opening ( 8th ) of the mounting foot ( 4 ), wherein the rivet pin ( 9 ) a widened rivet head ( 10 ), which against the contact surface ( 14 ) facing away from the opening ( 8th ) is present. Container according to claim 3, characterized in that the rivet pin ( 9 ) captive in the opening ( 8th ) is used. Container according to one of claims 1 to 4, characterized in that the mounting foot ( 4 ) has a plurality of welding pins. Container according to one of claims 1 to 5, characterized in that the anchoring head ( 11 ) is conically widened or conically undercut. Container according to one of claims 1 to 5, characterized in that the anchoring head ( 11 ) as mushroom head ( 15 ) is formed, whose leading end has a radius and whose leading end has a larger diameter than a shaft 13 of the welding pin. A process for producing a container, preferably according to one of claims 1 to 7, comprising the following process steps: a) extruding a tubular preform from a thermoplastic polymer and dividing the preform into at least two webs or b) extruding two sheet-like preforms, c) introducing the preforms in an open blow molding tool with two outer cavities each having a cavity and an accessory carrier which can be moved between the outer mold d) arranging at least one accessory on the accessory carrier, the accessory comprising at least one attachment foot ( 4 ) having a contact surface ( 14 ), the mounting foot ( 4 ) has at least one welding pin, which consists of the contact surface ( 14 protruding, the welding pin at its from the contact surface ( 14 ) projecting end a widened or undercut anchoring head ( 11 e) applying the preforms to the defined by the cavities contour of the blow mold, f) joining the accessory to a cup-shaped intermediate product such that the welding pin in the relevant hot-plastic preform penetrates and g) adding the cup-shaped intermediate products to a container. A method according to claim 8, characterized in that the welding pin as not integral with the mounting foot ( 4 ) trained rivet pin ( 9 ) in an opening ( 8th ) of the mounting foot ( 4 ) is used. Method according to one of claims 8 to 10, characterized in that the welding pin is pressed by means of a arranged in the accessory carrier punch or abutment in the preform. Method according to one of claims 9 or 10, characterized in that the welding pin captive in the opening ( 8th ) of the mounting foot ( 4 ) is used. Method according to one of claims 8 to 11, characterized in that the mounting foot ( 4 ) consists of a polymer which can not be welded to the preform. Method according to one of claims 9 to 12, characterized in that the mounting foot ( 4 ) is produced by injection molding a first thermoplastic polymer and that the rivet pin ( 9 ) of a second thermoplastic polymer in the opening ( 8th ) of the mounting foot, wherein the first thermoplastic polymer is incompatible with the second thermoplastic polymer.

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