WO2019219279A1

WO2019219279A1 - Fluid-tight connection of a container made of thermoplastic material with a closure part or functional part made of a thermoplastic material, and corresponding container

Info

Publication number: WO2019219279A1
Application number: PCT/EP2019/057517
Authority: WO
Inventors: Florian MÜLLER; Oliver UNTERLECHNER; Oliver Hoch
Original assignee: Alpla Werke Alwin Lehner Gmbh & Co. Kg
Priority date: 2018-05-15
Filing date: 2019-03-26
Publication date: 2019-11-21
Also published as: EP3793809A1; AR114904A1; CH714981A1

Abstract

The invention relates to a method for the fluid-tight connection of a container (1) which is formed from a thermoplastic tube extruded in one or more layers at least in some regions or which is blow-moulded from a preform injection-moulded and/or impact-extruded in one or more layers at least in some regions, the container having a closure part or a functional part (11) made of a thermoplastic material. The closure part or the functional part (11) forms a first joining partner and the plastic container (1) forms a second joining partner. A connection region between the plastic container (1) and the closure part of the functional part (11) is formed in or on the neck (3) of the plastic container (1). The container neck (3) is free from structures for firmly connecting the closure part or the functional part (11) to the container neck (3). The connection between the first and the second joining partner is created with the aid of radiated laser energy (L). A first joining partner acted on firstly by the radiated laser energy (L) is at least partially transparent to the radiated laser energy (L). The radiated laser energy (L) is at least partially absorbed at least in the connection region, in which the first and the second joining partners lie against each other under the application of force. A non-releasable integrally bonded connection between the two joining partners is created with the aid of the radiated laser energy (L) by melting and subsequently solidifying the first joining partner and/or the second joining partner in the connection region. The plastic of the first joining partner and the plastic of the second joining partner are compatible with one another at least in the connection region. A container (1) produced by the method and having a closure part or having a functional part (11) is also described.

Description

Fluid-tight connection of a container made of thermoplastic material with a closure part or functional part made of thermoplastic material and related container

The invention relates to a method for fluid-tight connection of a container made of a thermoplastic plastic container with a closure part or with a functional part of a thermoplastic material according to the preamble of Pa tentanspruchs 1. The invention also relates to a drive according to the invention Ver produced plastic container with a Closure or with a functional part.

Various techniques are known in the prior art for joining components made of thermoplastic materials. These include various types of positive connections, frictional connections, compounds by deformation, such as compression joints. Rivets, connections by mechanical means, e.g. Screw ben, and cohesive connections, such as welded joints or adhesive compounds. Also laminations are known to bind plastic parts together ver. Apart from the mechanical strength, which must have such plastic-plastic compounds, in compounds of plastic containers with closures or with functional parts, such as, pouring, etc., often also to the requirement that the compounds in particular tight against fluids, ie gases and Liquids, and free-flowing goods such as powder should be.

The usual in the past containers made of white or stained, glass or ceramic are increasingly dissolves abge of plastic containers. In particular, for the packaging of fluid substances, such as beverages, flowable Febensmitteln such as ketchup, sugo, pesto, sauces, mustard, mayonnaise and the like, household products, toiletries, cosmetics, etc., now mainly plastic containers are used. The low weight and the lower costs certainly play a significant role in this substitution. The use of recyclable plastic materials, the use of bioplastics and the Overall, more favorable overall energy balance in their production also contribute to promoting the acceptance of plastic containers, in particular of plastic bottles, in the consumer.

For cost-effective production of a large part of the plastic containers used today, essentially two methods have been established, namely the stretch blow molding process and the extrusion blow molding process. In the stretch blow molding method, a preform of usually elongated, tube-like Ge is first prepared casting in an injection molding, which is closed at its one longitudinal end with a bottom and at the other longitudinal end has a neck portion. The preparation of the preforms can be done time Lich and / or spatially separated from the subsequent blowing process. In an alternative process, the produced preform is further processed without intermediate cooling immediately after its production. This can be done in the so-called injection blow molding with the help of a single mechanical system on which the pre molded form, is inflated to a container of the desired Lorm and demolded. In blow molding, the preform can also be stretched axially by means of a stretching mandrel. Stretch blown plastic containers are identifiable at a customarily arranged in the Bo denbereich of the container injection point, which form the output of the injection molded preform originates.

In the extrusion blow molding process, a portion of a single or multilayer extrudier th plastic tube is inserted into a Lormkavität a blow mold and inflated by a supplied with pressure medium, usually air, to the desired container. Extrusion blown containers are identifiable at the usually located in the bottom region of the container squeezing seam, which results from the squeezing of the extruded plastic tube used in the blow mold.

As raw materials for the extrusion of the plastic tube used for the extrusion blow molding process thermoplastic materials, in particular polyolefins, such as polyethylene, polypropylene, and their derivatives or copolymers are used. The thermoplastics or parts thereof may be one or more layers ausgebil det and / or colored. Condition for the usable plastics is their suitability for the extrusion blow molding of the plastic container. Depending on the nature of the substance to be poured, the plastic containers are often provided with under different pourers or similar functional parts. The pourer is to allow, for example, a spill-free pouring, a dosage simpli chen or allow a planar spreading of the substance contained in the container. In addition to the adaptation to the respective substance, the use of a pourer also has the advantage that the same type of plastic container can be equipped with egg nem different pourer depending on the wishes of the bottler. The spout can be equipped with devices that allow the container to be closed. Example, as may be hinged to the top of the pourer, a pivotable cover part. Alternatively, means may be provided on the spout or on the container neck, which allow a positive connection, for example with a screw cap. The means may be, for example, male threaded sections or slotted guides for a Bajo nice closure and the like, which cooperate with correspondingly formed formschlüssi gene elements on the closure part. The spout and / or the closing part usually consist of a pourable in an injection molding process thermoplastic polymer, such as a polyolefin, in particular polypropylene. The formation of the means for the positive connection with a closure part requires special designs of the injection mold for the functional part and / or the United closing part and / or the blow mold for the plastic container. The resulting additional costs lead to the desire for a simpler and less expensive Formge environment of plastic components and thus for an alternative method for creating a fluid-tight connection of a thermoplastic plastic container with a closure or with a functional part made of a thermoplastic material.

The object of the present invention is therefore a method for fluid-tight connec the one consisting of a thermoplastic plastic container with a United or bereitzustel len with a functional part of a thermoplastic plastic, which allows the plastic container and / or the functional parts and / or make the fasteners with simpler geometries. The inventive solution of the above-described objects consists in a method for fluid-tight connection of a thermoplastic container be stationary container with a closure part or with a functional part made of a thermoplastic material and in a resulting plastic container with the features of the independent claims. Further developments and / or vorteilhaf te embodiments of the invention are the subject of the dependent claims.

The invention proposes a method for the fluid-tight connection of a least one area partially mono- or multi-layer extruded thermoplastic hose or one of an at least partially one or more layers gespritz th and / or flow-molded preform blow-molded container with a closure member or with a functional part made of a thermoplastic material. In this case, the closure part or the functional part form a first joining partner and the container neck a second joining partner. A connection region between the two joining partners, namely the plastic container and the closure part or the functional part, is formed in or on the container neck of the plastic container. The container neck is formed free of structuring for the fixed connection of the closure part or the functional part to the container neck. The connection between the first and the second joint partner is created with the aid of irradiated fiber energy. In this case, a joining partner which is first acted upon by a blasted fiber energy is at least partially transparent to the incident fiber energy. The irradiated fiber energy is at least partially absorbed in the connection region in which the first and the second joining partners abut each other under the action of force. With the help of the radiated chamfer renergie an insoluble cohesive connection between the two joining partners is made by melting the first joining partner and / or the second joining partner in the connection area and subsequent solidification of the molten plastic. The plastic of the first joining partner and the plastic of the second joining part ners are compatible with each other in the connection area.

In contrast to the known form-fitting or frictional connection types between the container neck and a closure part or a functional part, example, a spout, the two joining part ner are materially connected together in a fiber welding process in the proposed method. The compa The quality of the two plastics, namely the plastic of the first joining partner and the plastic of the second joining partner, enables a secure, ie mechanically loadable and fluid-tight welded connection. The compatibility can be characterized by who, that a mixing length d is so long that entanglements can form. Here, the mixing length is greater than or equal to the so-called critical length l _c , from which entanglements occur in polymers (d> l _c ). For the critical length we have: l _c = b * (M _c / (6 * MO)) ^0.5

With

l _c critical length

b Kuhn segment length

M _{c is the} critical molecular mass from which entanglements occur

MO molecular weight of the monomer

More specifically, the blending length d can be defined according to the Helfand formula, as follows: d = b / (6 * c) ^(0.5)

With

d intermingling length

b Kuhn segment length

c Llory-Huggins parameter can be defined c according to Hansen, as follows: c = (D ² ) * l00 / (4 * R * T)

With

D Hansen distance (HSP)

R ideal gas constant

T temperature

2

where D can be defined according to Hansen, as follows D ² = 4 * (Dϋi + Dϋ ₂ ) ² + (DRi - DR ₂ ) ² + (DHi + DH ₂ ) ²

With

Dϋ dispensiv part of the Hansen solubility parameter for the first joining partner Dϋ ₂ dispensiv part of the Hansen solubility parameter for the second joining partner DR polar part of the Hansen solubility parameter for the first joining partner DR ₂ polar part of the Hansen solubility parameter for the second joining partner DH proportion of hydrogen bonding for the first joint partner

DH ₂ fraction of hydrogen bonding for second joining partners

Due to the compatibility of the two plastics, the polymers can ideally form co-continuous phases at their interface and thus entanglements of molecular chains by interdiffusion. Due to the compatibility of the two plastics, at least in the connection region, any structuring for fixing the closure part or the functional part can be dispensed with in the container neck. Structuring for fixing can beipielsweise threads or portions thereof, snap elements, Kulissenfüh ments or bayonet elements. In its simplest embodiment, the container neck is similar to a hollow cylinder in the region of its receptacle for the closure part or the functional part. The same applies to the serving for connection portions of the United closure part or the functional part. In its simplest embodiment, at least the region of the closure part or the functional part facing the container neck is planar, that is to say free from projections and / or recesses. Since the proposed method is directed to the connection of a closure part or a functional part to a container neck GE, there are no special requirements for the further embodiment of the plastic container. Thus, the term "plastic container" bottles, tubes and the like term plastic articles comprising a closure part or a functional part aufwei sen. The product to be stocked in the plastic container, called contents, can be filled after the joining of the closure part or the functional part of the container neck who the. This can be done through an opening in the closure part or in the functional part. In tubes, the contents can be filled in a the closing part or in the functional part gegenüberlie ing opening, said end is sealed fluid-tight after filling usually by gluing or welding. Also, the filling material can be filled before the joining of the closure part or of the functional part to the container neck. the. In particular, in the case of liquid filling material in conjunction with plastic containers with a closed bottom, the plastic container can already be brought into its final shape by means of the liquid filling material in the blow mold and in this case remain in the plastic container. During laser welding, a common melt is formed in the connection region of the two mutually adjacent joining partners due to the absorption of a blasted laser energy, into which both joining partners are forced, and which leads to the cohesive connection on cooling. The compound is fluid-tight and insoluble or separable only by the use of force. The common melt may mean that both joining partners have been liquefied in the bond area at their interfaces. Ideally, none of the joining partners has been heated above its ceiling temperature or its decomposition temperature. For amorphous thermoplastics, the glass transition temperature should have been exceeded. In semicrystalline thermoplastics, the crystallite melting temperature has been exceeded. By the proposed method, the blow mold and the injection mold or extrusion mold can be made simpler. The plastic container can be made with we niger material use. The demolding of the closure part or of the functional part by the injection molding or extrusion molding process can also be carried out in a simplified manner. As a result, the components can be manufactured more cheaply. The fact that the closure part or the functional part can not survive or only slightly beyond the mouth edge of the plastic container, there are also new Ge staltungsmöglichkeiten for the container.

It is understood that the first joining partner and the second joining partner, which are generally both flat, overlap each other to produce the connection. The stoffschlüs sige connection generated between the first joining partner and the second joint partner is insoluble or separable only by the use of force. Either the first or the second joint partner consists of a thermoplastic material which at least partially absorbs the incident fiber energy. In general, the joining partner will at least partially absorb the fiber energy, which is secondarily acted upon by the fiber energy. In this way, the partial absorption beyond the connec tion range can also be done in adjacent areas of the first or second joining partner. The at least partial absorption of the incident fiber energy is thus not limited to the connection region. In the connection area, an additive can be are ordered, which supports the energy input into the two joining partners by at least partially absorbing the irradiated laser energy. As a result, the at least partial absorption of the irradiated laser energy can be better limited to the connection region. As a rule, both joining partners for the irradiated laser energy are at least partially transparent. The additive and / or the plastic may have filling substances which at least partially absorb the wavelength of the irradiated laser light. The additive may be applied to or in one of the joining partners or also on or in both joining partners, in particular in the connection region, or be embedded in the synthetic material, at least in the connection region. Also, the plastic as sol Ches already be at least partially absorbent to the radiated laser energy, so that can be dispensed additive to the addition of absorbent fillers and / or absorbent Ad. Furthermore, a laser energy at least partially absorbing the irradiated laser energy may additionally be combined with an additive in the connec tion area. With appropriate selection of the additive, absorption may be assisted by partial reflection on the fillers. By arranging the additive in the connection region between the first and the second joining partner, the laser energy can be introduced directly where it is needed to form the common melt. Basically, if necessary, the punctiform introduction of the laser energy is possible. Accordingly, no large-scale Erwärmun conditions of joining partners are necessary, which could damage them. The inventive drive Ver borrowed in known laser welding for flat components and requires only minor modifications in the apparatus design.

According to a modified embodiment of the invention, the closure part or the functional part can only partially consist of a plastic which at least partially absorbs the incident laser energy. For example, the closure part or the functional part has a section which consists of a plastic which is transparent to the incident laser energy. At this section can connect a plastic that absorbs at least partially the incident laser energy. This plastic can be applied, for example, in a 2K injection molding. The absorbent plastic differs from the transparent plastic in that it fillers and / or an additive were admixed, which absorb the laser energy at least partially absorb. The additive can be arranged in the connection region at least on that of the joining partners, which is achieved by the irradiated laser energy after the least partial irradiation of the other joining partner. Thus, for example, the first, respectively the second joining partner is largely continuous for the wavelength of the laser light is used, which is at least partially absorbed at the second, respectively the first joining partner. The energy consumption via the additive on the one hand and the heat radiation on the other hand is sufficient to produce a material bond, supported by the frictional connection between the two joining partners. The additive can also be provided on or in the second, respectively first joint partner, which is only exposed to the laser energy after the straightening of the first, respectively the second joining partner. The additive can be applied as a coating or applied as a second component Kunststoffkom during the manufacture of the component by overspraying. Be the layers can also be done by inkjet printing, pad printing, flexographic printing or the like. As coating materials are used, which consist of soot contain soot and / or contain substances that absorb at least partially the laser energy. Instead Russ can also be used a Multipurpose lamination.

In a process variant of the invention, the additive is embedded at least in the plastic of the connection region of the first and / or the second joining partner. The joining partners formed in this way can be produced, for example, in a special 2K plastic injection molding process. Finally, it can also be provided that the laser energy-absorbing additive is distributed substantially uniformly, at least over the connecting region of the second joining partner, preferably embedded therein.

In a variant of this fiber welding method, the closure part or the functional part is preassembled on the container neck of the plastic container such that a circumferential sealing skirt protruding from the closure part or the functional part overlaps an outer wall of the container neck of the plastic container at least regionally. Here, the outer wall and the protruding circumferential sealing skirt form the connection area. The peripheral sealing skirt is at least partially transparent to the one radiated fiber energy, while the adjacent container neck of the plastic container, on which the sealing skirt under force, which is generated by bias, is applied, at least in the connection region with respect to the irradiated laser energy absorbing.

In an alternative variant of the laser welding method, the closure part or the functional part is pre-mounted on the container neck of the plastic container such that a protruding circumferential sealing skirt protrudes through a container mouth into the interior of the container neck of the plastic container and under force, which is generated by voltage before, abuts against an inner wall of the container neck. Here, the inner wall and the projecting circumferential sealing skirt form the connection area. The container neck of the plastic container is at least partially transparent to the incident laser energy while the sealing skirt is absorbent at least in the adjacent connection region with respect to the irradiated laser energy. In particular, in connection with the EBM method, the container neck can be made burr-free on its Innenwan. This desired freedom from burrs can be assisted by calibrating the inner wall of the container neck by means of a calibration mandrel.

The fabric bond produced with the aid of a blasted laser energy in the connection region between the first and the second joining partner leads to a circumferential laser weld having an axial extent of 0.005 mm to 0.8 mm, preferably 0.1 mm to 0.2 mm ,

In an alternative method variant of the laser welding, a radially erstreckender, circumferential flange of the closure part or the functional part is pressed at least currency end of the introduction of the laser energy under force against a ring around current orifice surface, which bounds a container mouth to the container neck of the plastic container. Here, the radially extending, circumferential flange and the annular circumferential orifice surface form the connection region. The resting on the muzzle surface flange is at least partially transparent to the radiated laser energy, while at least the mouth surface and, where appropriate, the axially adjoining portion of the container neck is formed at least partially absorbing against the incident laser energy. According to a further embodiment of the invention, the first, respectively the second joining partner in the connecting region has an annular circumferential rib which predetermines a setting path of the first and / or the second joining partner, and which is melted during the irradiation of the fiber energy. By this rib, the irradiation energy of the fiber can be reduced compared to a full-surface melting. The melted rib can form the melt into which the joining partners can be pressed ge. After the melt has cooled, a fluid-tight, non-detachable connection of the two joining partners can be formed. It is not absolutely necessary for the joining part, on which the rib is not formed, to likewise be melted in the connection area, usually heating above the glass transition temperature in order to produce a sufficiently good connection between the joining partners. In one embodiment, a ring-shaped circumferential rib protruding from the underside of the radially encircling flange of the closure part or of the functional part may be formed on one of the mouth surface of the container neck. For the cohesive connection, the closure part or the functional part are aligned with respect to the neck region of the plastic container in such a way that the annular circumferential rib rests approximately in the middle of the radial extent of the mouth surface. Since the introduced fiber energy can only be sufficient to melt the rib and not additionally the surface on which the rib builds up, in the present case the closing part or the functional part is pressed into the melt formed by the melted rib, until Alternatively, the rib may also be formed on the mouth surface of the container neck instead of on the underside of the radially encircling flange. In a further embodiment, the annular circumferential rib may be formed on a side of the sealing skirt of the closure part or of the joining part facing the container neck. Here, the rib may be formed on an outer wall of the sealing skirt when the sealing skirt is to be arranged in the container neck or on an inner wall of the sealing skirt when the sealing skirt is to be slipped over the container neck. Alternatively, the rib may also be formed on the container neck instead of on the sealing skirt. In particular, when the sealing skirt is to be slipped over the container neck is it may be better from manufacturing considerations, to arrange the rib on an outer wall of the container neck.

According to a further exemplary embodiment of the invention, the annularly circulating de rib has a cross section which tapers to its projecting end. The rib has a height between about 0.05 mm and about 1.0 mm and a maximum width between 0.1 mm and 1.0 mm. The height may be between about 0.05 mm and about 0.5 mm with a diameter of the container mouth of less than 50 mm and between about 0.1 mm and about 1.0 mm with a diameter of the container mouth between 50 mm and about 100 mm his. The maximum width may be between about 0.1 mm to about 0.5 mm with a diameter of the container mouth of less than 50 mm and between about 0.2 mm to about 1 mm with a diameter of the container mouth between 50 mm and about 100 mm ,

According to a further exemplary embodiment of the invention, the laser energy is radiated in a region of a cone having a half opening angle of less than approximately 20 °, preferably less than approximately 7 ° and particularly preferably less than approximately 2 °, the central axis of the cone being perpendicular in the connection region is on an outer wall of the joining part, which is acted upon by the laser energy first. Thus, a plastic container and a closure part or functional part miteinader be joined, the shape of which snaht curved along the weld. Ideally, the laser energy is introduced in the connection region perpendicular to an outer wall of the joining part, as this the laser energy requirement is the lowest.

According to a further embodiment of the invention, the force of the art is chosen such that a surface pressure of the first and second joining part in the connec tion range between about 5 MPa and about 35 MPa is formed. Preferably, the surface pressure may be selected from about 15 MPa to about 30 MPa, and more preferably from about 20 MPa to about 27 MPa. The force can be used to push the joining partners in the melt. In connection with the rib, which is melted by the laser energy and forms a melt, can be pressed by the Flächenpres solution, the one joining part relative to the other joining part to the setting path in the melt. According to a further embodiment of the invention, a circumferential laser weld seam is generated with the aid of the laser beam th beam laser in the connecting region between the first and the second joining part, which has an extension between about 0.01 mm and about 0.8 mm, preferably between about 0.05 mm and about 0.2 mm, which is measured transversely to the circumferential line of the laser weld in a plane perpendicular to Einstrahlrich direction of the laser energy.

According to a further exemplary embodiment of the invention, alignment guides can also be arranged on the container neck at the two joining partners for the positionally accurate positioning of the closure part or the functional part. These may include one or more notches and ridges or the like which may interact with each other during pre-assembly.

According to a further embodiment of the invention, the Verbindungsbe are rich both of the one or more layers produced in a blown plastic container and the connection region of the closure part or the functional part made of a plastic whose main component, ie 70% and more, is polar plastic material from the group consisting of PET, PET-G, PET-X, PVC, PEN, PA, PC, PU, PMMA, POM, copolymers of the listed plastics, bioplastics such as PEF or PPF, filled plastics and / or mixtures of The closure part or the functional part can also be produced in a 2K injection molding process and comprise different plastics.

According to a further embodiment of the invention, the Verbindungsbe are rich both of the one or more layers produced in a blown plastic container and the connecting portion of the closure part or the functional part made of a plastic whose main component, ie 70% or more, is non-polar plastic, from the group consisting of HDPE, PP, PS, LDPE, LLDPE, PTFE, PS, copolymers of the cited plastics, bioplastics such as PLA, filled plastics and / or mixtures of said plastics is selected. According to a further embodiment of the invention, the first, respectively the second joining partner in the connection area on a ring element, which is made of polar plastic material, when the first, respectively the second joining partner of non-polar plastic and the second, respectively the first joint partner of polar Plastic is made. For example, a plastic container, which is made of PET, with a closing element Ver or functional element, which is made of PP, be connected fluid-tight by the closure element made of PP has a ring member in the connection area, which is made of PET and thus with the plastic container made of PET compatible and therefore good weldability. It is not necessary for the non-polar plastic of the closure element and the polar plastic of the ring element to bond to one another in a material-locking manner. Rather, it may be sufficient that the ring element is designed such that it is fixed by an encapsulation in the United locking part or the functional part in the axial and radial directions. For example, the ring element may have recesses or openings into which the umsprit Zende plastic can penetrate. Also, primers can be used to create adhesion of PP and PET.

For the creation of the cohesive, possibly supported by a frictional connection between the two joining partners, a laser with a wavelength of 800 nm to 1200 nm or from 1800 nm to 2400 nm is used as the source for the incident laser energy to the joining partner the laser energy impinges first, to be able to penetrate at least partially, while the other joining partner, the laser energy at least partially absorbed. Lasers of these wavelengths provide the desired energy, which is required for the creation of the cohesive connection. For example, the laser is a diode laser. Diode lasers have low purchase and maintenance costs, are durable and powerful.

In a variant of the method for connecting rotationally symmetrical joining partners, the laser energy can be radiated substantially simultaneously over 360 °. This can be achieved for example by means of a special laser optics. If required, the irradiated laser energy can be selectively focused on selected angular ranges within 360 ° with the aid of shielding diaphragms. Furthermore, for the purpose of connecting rotationally symmetrical joining partners, they can be rotated to radiate the laser energy. moved radially and / or translatorily past a laser. As a rule, we are punctiform at the laser energy here. By choosing the speed, a uniform quality of connection over the circumference is generally achieved. Ideally, the first joining partner and the second joining partner are coaxially aligned tet and the laser energy is introduced perpendicular to the two joining partners.

According to a further embodiment of the invention, a plastic container made of at least partially single or multilayer extruded thermoplastic tube or made of at least partially single or multi-layered ge sprayed and / or flow-molded preform in a blow molding. It has a container body and an adjoining container neck, which is fluidly connected to a closure part or with a functional part made of a thermoplastic material. The plastic container is formed at least in the connection region with the closure part or the functional part substantially free of structuring for the firm connection of the closure part or the functional part. The fluid-tight connection between the container neck of the plastic container and the United locking part or the functional part is a created by means of fiber energy stoffschlüs sige compound. Both the plastic of the plastic container and the plastic of the closure part or the functional part in the connection area are compatible with each other. Ideally, the plastic container with the closure part or the func onsteil is prepared according to the method described above.

By the container neck and the closure part or the functional part by fiber welding sen interconnected, can be dispensed with in their preparation on the formation of form-fitting cooperating fasteners, such as threaded deabschnitte and threads or slide guides and engaging projections. Thus, for example, the container neck of the plastic container can be formed free of projecting or rebounding structures, at least in the later connection region. The same applies to the connecting portions of the closure part or the functional part. As a result, the blow mold and the injection mold or extrusion mold can be formed in simpler geometries. Thus, the cost of producing the molds is reduced. In addition, the plastic container and the closure part or functional part can be designed simpler. This too can become one lead to reduced use of materials, as can be dispensed with material accumulation to achieve a ge stalterischen effect. By way of example, the configuration of threads or thread segments in closure parts or functional parts is to be mentioned, which are arranged on an inner wall of closure parts or of functional parts. The inner wall opposite the outer wall is smooth for design reasons. Thus, the threads or thread segments represent an accumulation of material, which can be dispensed with by the proposed embodiment of plastic container and closure part or functional part. The demolding of the closure part or of the functional part by the injection molding or extrusion molding process can also be carried out in a simplified manner. As a result, the components can be manufactured more cheaply.

For the purposes of this invention, by the term "plastic container" also tubes to summarizes. According to a further embodiment, the plastic container is designed as a tube with a tube body having a first and second end, wherein the tube body at the first end has a Tubenfalz which is fluid-tightly closed, and at the second end a circumferential substantially cylindrical have formed return to which the closure is steep or the functional part fluid-tight permanently connected. At the substantially cylindrically shaped return jump, which serves as a receptacle for the closure element or functional element and at the same time can serve as a centering, may be arranged on the outer wall and the rib running around, which serves to produce the common melt, in which can set the closure element or the functional element. The product to be pre-loading is filled through the first opening in the tube body, before this first end is closed by forming a Tubenfalzes by gluing or welding. The tube body can be moved by an extrusion blow or by an injection molding process.

An alignment aid may be provided on the container neck or on a container mouth extending radially extending mouth edge, which is designed for a positionally accurate Ausrich tion of the closure part or the functional part and cooperates with a corre sponding positioning means on the closure part or on the functional part. As a result, in the pre-assembly, the positioning and rotational orientation of the closure part or the functional part with respect to the container neck can be simplified. According to a further embodiment of the invention, a fluid-tight seal between the container neck and the closure part or the functional part is arranged outside the connec tion area toward the interior of the plastic container body. This fluid-tight seal can serve to prevent any smuts that might develop during the welding process from entering and precipitating inside the container body. This fluid-tight waterproofing device can be formed, for example, as a cylindrically, conically or convexly formed sealing apron, which protrudes from the closure part or the functional part. In general, the two contact zones will be configured tion to the other joining partner according to their function, so that the interior of the plastic container body adjacent first contact zone can develop a sealing effect, however, the environment of the plastic container adjacent second contact zone is usually ausgebil det as a rib , which is melted by the introduced fiber energy. Also, the first contact zone may be arranged on the first joining partner and the second contact zone on the second joining partner, or vice versa.

In a further embodiment of the invention, the closure part or the radio tion part has a radially extending, circumferential flange, which rests on a Be container mouth bordering the mouth area and forms a fluid-tight form-fitting connection area with the container neck.

According to a further embodiment of the invention, both the one or more layers in a blow molding produced plastic container and the United closing part or the functional part at least in the connection area of a synthetic material are made, the main component, ie 70% or more, is polar plastic, from the group consisting of PET, PET-G, PET-X, PVC, PEN, PA, PC, PU, PMMA, POM, copolymers of the cited plastics, bioplastics such as PEF or PPF, filled plastics and / or mixtures of said plastics , is selected.

According to a further embodiment of the invention, both the one or more layers in a blowing process produced plastic container as well as the United closing part or the functional part at least in the connection region of a plastic made, the main component, ie 70% or more, is nonpolar plastic, from the group consisting of HDPE, PP, PS, LDPE, LLDPE, PTFE, PS, copolymers of plastics led, bioplastics such as PLA, filled plastics and / or Mixtures of said plastics, is selected

The functional part may be a pouring attachment and comprise an integrally formed closure part. In this case, the pouring attachment and the closure part can also be in one piece.

It will be clear to a person skilled in the art that features directed to the method, where appropriate, can also be related to the device, and vice versa.

Further advantages and features of the invention will become apparent from the following description Be of embodiments with reference to the schematic drawing calculations. It shows in non-mass sticks faithful representation:

Figure 1 is an axial section of a plastic container with a functional part.

FIG. 2 is an enlarged axial section of a connecting region; FIG. and

Fig. 3 to Fig. 9 axial sections of variants of two pre-assembled joining partners.

The method for fluid-tight connection of a container made of a thermoplastic plastic container with a closure part or with a functional part of a thermoplastic material is explained below using the example of a provided with a pouring plastic container. A plastic container, which was inflated from a single- or multi-layer extruded tube or from at least partially single or multilayer sprayed and / or flow-pressed preform of a thermoplastic plastic in a subsequent blowing process is provided in Fig. 1 throughout the reference numeral 1 , The plastic container 1 has a direction indicated by the reference numeral 2 container body 2, to which a container neck 3 connects. At the container neck 3, for example, a rotationally symmetrical container mouth 4 is provided. A mounted on or in the container neck 3 pouring tower carries the reference numeral 11. For reasons of clarity was waived unterschiedli che hatching of the plastic container 1 shown in the axial section and the Ausgiessauf rate 11. The pouring attachment 11 has an annular, circumferential, plate-shaped flange 13, which is provided with a pouring opening 12 and which is supported on a mouth area 6 bordering the container opening 4 in the neck section 3. From the pouring opening 12 of the pouring attachment 11 is recloseable and therefore equipped with a closure member 18, which is formed for example as a flap closure (flip top) and is articulated via a hinge joint 19 on the plate-shaped flange 13. From the plate-shaped flange 13, a sealing skirt 14 extends into the container neck 3. The sealing skirt 14 may be cylindrical, conical or convex and is located on an inner wall 7 of the container neck 3 in the receiving area for the sealing apron 14. The sealing skirt 14 may be compared to an inner diameter of the Behäl terhalses 3 have an excess, so that its outer wall 15 relative to the inside wall 7 of the container neck 3 has a bias. With an inner diameter of up to 50 mm, this over a largest outer diameter of the sealing skirt 14 measured excess, for example, 0.05 mm to about 0.5 mm. For inner diameters of the container neck 3 in the receiving area of> 50 mm, the excess may be, for example, 0.2 mm to 0.6 mm. Although the figure 1 is only a schematic representation, it is still apparent that the container neck 3 is free of Strukturierun conditions for firm connection between the container neck 3 and the pouring attachment 11, such as threaded sections, snap connections, bayonet connections, etc.

The plastic container 1 in the present exemplary embodiment is an extrusion-blown plastic container. In the extrusion blow molding process, a portion of a single or multilayer extruded plastic tube is inserted from a ther moplastic plastic into a mold cavity of a blow mold and inflated by a supplied with pressure medium, usually air, to the desired container. Extrusion blown containers are identifiable at the usually located in the bottom region of the container squeezing seam, which results from the squeezing of the extruded plastic tube used in the blow mold. Preforms, from which containers are produced by stretch blow molding, are usually produced in injection molding and usually have an injection point in the bottom region, which is also visible on the blown bottle. Thermoplastic materials are used as raw materials for the extrusion of the plastic hose used for the extrusion blow molding process or for the injection molding of the preforms. The thermoplastics or parts thereof may be one or more layers and / or colored.

To create a mechanically strong connection between the container neck 3 of the plastic container 1 and the pouring 11, which is free of residues, for example, microparticles, adhesive residue and the like, quickly feasible and easy to integrate into the process, which offers from the prior art known laser welding process. In Fig. 1, a laser is indicated by the reference numeral 31. The laser 31 has, for example, a wavelength of 800 nm to 1200 nm. For example, it is a diode laser. With the aid of a special optical system 32, the laser energy L irradiated by the laser 31 can be directed simultaneously over 360 ° onto the connecting regions of the container neck 3 and the sealing skirt 14 of the pouring attachment 11.

Ideally, the laser light is perpendicular to an outer wall 5 of the Behälterhal ses 3 and thus also substantially perpendicular to the outer wall 15 of the sealing apron 14 of the pouring 11 directed. If necessary, the irradiated laser energy can be selectively focused on selected angular ranges with the aid of diaphragms. The container neck 3 with the pouring attachment 11 inserted can also be moved rotationally and / or translationally past the laser source in a speed which is favorable for the method. The plastic of the container neck 3 and the plastic of the pouring attachment 11 are compatible with one another in the connection region. The joining part which is first acted upon by the laser energy, that is to say in the present case the container neck 3, is at least partially transparent to the incident laser energy. The irradiated laser energy is at least partially absorbed in the connection region. This leads to a melting of the two joining partners in their connection area.

By melting the outer wall 15 of the pouring attachment 11 and / or In nenwandung 7 of the container neck 3, after the cooling of the melt a coherent compound is generated, which is mechanically resilient and fluid-tight. As can be seen from Fig. 1, and the outer wall 5 of the container neck 3 is free of Strukturierun gene, such as threaded sections, thread grooves, slide guides and the like. On such pre-or recessed structuring can be omitted, since the Outlet attachment 11 by laser welding sen with the container neck 3 is connected.

This simplifies the production of the plastic container, the external appearance of the plastic container He can be improved and adapted to customer Erfor conditions.

Fig. 2 shows schematically the conditions in the preparation of a laser welding sverbindung between a first joining partner, namely the container neck 3, and a second Fu partner, namely the sealing skirt 14 of the pouring 11th For reasons of clarity, the two joining partners are shown with a distance from each other. However, it should be expressly noted that the two joining partners at least in their joining region, which is acted upon by laser energy, with force applied to each other. In the present embodiment, the inner wall 7 of the neck portion 3 and the outer wall 15 of the sealing skirt 14 are in the connecting region under a voltage of about 20 to 27 MPa ago. Ideally, the prestressed connection is also the sealing zone of the first and second joining partners. In order to produce a non-detachable and fluid-tight cohesive connection between the first and the second joining partner, the area of the prestressing need not have been fully loaded with laser energy. Rather, a section-wise irradiation of laser energy is sufficient to produce a fluid-tight cohesive connec tion, wherein the sections may also be punctiform or linear or flat. The created cohesive connection leads to a weld seam, which may have an axial extent of about 0.005 mm to about 0.8 mm.

A first section of a first joining partner, for example the container neck 3 of the plastic bottle 1, is subjected to the laser energy L. The laser energy L is ideally perpendicular to the first joining partner, but can also in a region of a cone with half an opening angle of less than about 20 ° irradiated who the, with a central axis of the cone in the connection region perpendicular to an off senwandung of the joining part, the is acted upon by the laser energy first. The container neck 3 is at least partially transparent to the irradiated laser energy L at least in a first section in which the laser welding is to be created. After passing through the container neck 3, the irradiated laser energy L to a second portion of a second joining partner, in the present exemplary embodiment on the outer wall 15 of the sealing skirt 14 of the pouring attachment 11. The laser energy L is at least partially absorbed by means of an additive 21 arranged there. Here, the second portion of the second joining partner, respectively, the outer wall 15 of the sealing skirt 14, the sealing skirt 14 or the second joint partner itself, respectively the pouring 11, at least partially made of a plastic that absorbs the irradiated laser energy L at least partially absorbs , The additive 21 is a substance which absorbs the irradiated laser energy L as well as possible and converts it into heat. The additive 21 may be made of soot be, Russ and / or substances containing at least partially absorb the laser energy ren. The additive 21 may be applied as a coating or partially or even completely embedded in the plastic material. In general, the additive 21 is arranged on the wall of the second joining partner, which faces the first joining partner to be irradiated. It is understood that in addition, the Innenwan tion 7 of the container neck 3 may be provided in the connection area with an additive to support a larger energy input there as well.

The irradiated laser energy L radiates through the first joining partner, the container neck 3, without significant heating. In the second joining partner, namely the sealing skirt 14 of the pouring attachment 11, the laser energy is converted into heat energy and the art melted material. Due to heat conduction processes, the irradiated first transparent joining partner 3 is also plasticized in the connection region. Due to the preload voltage and the resulting from the expansion of the plastic melt inner joint pressure, there is a cohesive connection of the two joining partners. The plastic of the pouring attachment 11 and the plastic of the container neck 3 are compatible with each other. The main component of the plastic in the present Ausfüh tion example, ie 70% and more, is nonpolar plastic selected from the group best starting HDPE, PP, PS, LDPE, LLDPE, PTFE, PS, copolymers of the listed art materials, bioplastics such as PLA, filled plastics and / or mixtures of said plastics. The main component of the plastic, ie 70% or more, can also be polar plastic selected from the group consisting of PET, PET-G, PET-X, PVC, PEN, PA, PC, PU, PMMA, POM, copolymers of the cited Art- Substances, bioplastics such as PEF or PPF, filled plastics and / or mixtures of said plastics.

In Fig. 4 to Fig. 9 different embodiments of the inventive method are shown schematically. The method variants are again explained using the example of the fluid-tight connection of a functional part designed as a pouring attachment or spray attachment on or in a container neck of a plastic container. The same elements carry the same reference numerals in the figures. The respective joining partners are shown in the preassembled state before they are laser-welded together. On different hatching of the joining partners shown in section was again omitted for reasons of clarity. Likewise, the joining partners are each shown with a small distance from each other, so that de ren boundaries are better visible. However, it is understood that the two joining partners abut each other at least in the connection area under force.

The force can be applied from the outside pressure or result from a bias voltage of one joining partner to the other.

FIG. 3 essentially shows a method variant which has already been explained with reference to FIG. 1. The first joining partner is formed by the container neck 3. The second joining partner is formed by a sealing skirt 14, which protrudes from a plate-shaped flange 13 of the pouring attachment 11 into the interior of the container neck 3. A spray opening of the pouring attachment 11 bears the reference numeral 12. With regard to the oversize and the prestressing for producing the fiber-bonded joint, reference is therefore made to the fi gure description for FIG. 1. The fiber fusion is carried out analogously to the embodiment explained with reference to FIG. 1 by a lateral loading of the joining partners with fiber energy F.

Fig. 4 shows an alternative arrangement of the two joining partners. In this case, the first joining partner is formed by the sealing skirt 14, which protrudes from the plate-shaped flange 13 of the pouring attachment 11. The plate-shaped flange 13 rests on the mouth of the container 4 bordering mouth surface 6. The sealing skirt 14 is at least in the connection region under a bias on the outer wall 5 of the Behäl terhalses 3, which forms the second joining partner in this process variant. The Server welding is carried out analogously to the Ausführungsbei game explained with reference to FIG. 1 by a lateral loading of the joining partner with laser energy L. Here, the first joining partner, in this case the sealing skirt 14 of the pouring attachment 11, at least partially transparent to the radiated laser energy during the second joining partner, namely the container neck 3 at least in the connection region, the laser energy absorbed at least partially. The absorption of the irradiated laser energy L can in turn be supported by an additive which can be applied to the outer wall 5 of the container neck 3 or embedded in the plastic material of the container neck 3 Tet.

In the embodiment shown in Fig. 5, in turn, the container neck 3 forms the first joining partner, while the second joining partner is gebil det of a sealing skirt 14 which projects from a plate-shaped flange 13 of the pouring 11 into the interior of the container neck 3. The plate-shaped flange 13 is inserted into the container mouth 4 and held in the preassembled state only by the exerted as a result of an excess of the outer wall 15 of the sealing skirt against the inner wall 7 of the container neck 3 bias. With an inner diameter of up to 50 mm, the excess measured over a largest outer diameter of the sealing skirt 14 can be, for example, 0.05 mm to about 0.5 mm. For inner diameters of the Behäl terhalses 3 in the receiving area of> 50 mm, the excess may be, for example, 0.2 mm to 0.6 mm. The outer wall 15 of the sealing skirt 14 and the inner wall 7 of the container neck 3 in the receiving area for the sealing skirt 14 form a fluid-tight sealing zone after welding by irradiated laser energy L, ie a sealed sealing zone with respect to gases and liquids, but also to free-flowing solids such as powder or powder In contrast to the embodiments of Figures 1, 3 and 4, the Behältermün extension 4 bounding Mündungsfäche 6 is freely accessible.

Fig. 6 differs from the previously described embodiments in that the two joining partners are pre-assembled for axial laser welding. In this case, the pouring attachment 11, which forms the first joining partner which is at least partially transparent to the incident laser energy L, is placed on the container neck 3, which forms the second joining partner, such that a plate-shaped flange 13 of the delivery device casting attachment 11 rests on the annular circumferential, the container mouth 4 bordering mouth surface 6. A sealing skirt 14 protrudes from the plate-shaped flange 13 into the interior of the container neck 3. On the sealing skirt 14, a circumferential sealing bead 14 is arranged outside a connection region of the Ausgiessaufsat ZES 11 to the container neck 3 and towards the interior of the container body the container neck 3 and the pouring cap 11 from each other fluid-tight seals. In this way it can be ensured that any spillage arising during the welding process can not get into the container interior and precipitate there. In the case of axial laser welding, the laser energy L is irradiated approximately perpendicularly to the radial extension of the plate-shaped flange 13 and to the radial profile of the mouth surface 6 , The two joining partners, namely the flange 13 and the mouth surface 6 on the container neck 3, are pressed together for the laser welding operation. The contact pressure of the flange 13 against the muzzle surface 6 is selected from about 5 MPa to about 35 MPa, preferably from about 15 MPa to about 30 MPa, and more preferably from about 20 MPa to about 27 MPa.

The resting on the mouth surface 6 flange 13 is at least partially transparent to the incident laser energy L, while at least the mouth surface 6 and the axially adjoining portion of the container neck 3 are formed at least partially absorbing against the incident laser energy L. The Absorpti on the irradiated laser energy L can in turn be supported by an additive which can be applied to the mouth surface 6 or embedded there in the plastic material of the container neck 3.

As can be seen from the enlarged view in FIG. 7, the radially encircling flange 13 of the pouring attachment 11 can be formed with a ring-shaped circumferential rib 20 projecting from its underside 17 facing the mouth surface 6 in the preassembled state. For the cohesive connection between the first joining partner, namely the flange 13 of the pouring attachment 11, and the second joining partner bil Denden orifice surface 6, the two joining partners are aligned on the container neck 3, that the annular circumferential rib 20 approximately centrally of the radial extent of the mouth surface 6 rests. Under central in the sense of the invention is also still a deviation of the contact area of the rib 20 of 20% in both directions of extension the mouth area 6 considered. The annular circumferential rib 20 may have a tapered to its projecting free end, for example, approximately triangular, cross-section. It has an axial height h of about 0.1 mm to about 0.5 mm and a diameter of the container mouth of up to 50 mm measured on the underside of the flange maximum radial width b of about 0.05 mm to about 0th , 5 mm up. With a diameter of the container mouth of greater than 50 mm, the rib 20 has a measured at the bottom 17 of the flange maximum radial width b of about 0.2 mm to about 1 mm. The annular circumferential rib 20 can facilitate the fiber welding of the two joining partners and increase the strength of the cohesive Ver bond even further. In addition, the circumferential rib 20 can represent a limita- tion for a Setzweg, since reduced by irradiation of the fiber energy F only the rib 20 and a portion of the mouth surface 6 are melted, which forms the common melt, and the pouring head 11 is displaced into the common melt until its bottom 17 rests flat on the mouth surface 6.

FIG. 8 shows the pouring attachment 11 already known from FIG. 3, which is positioned opposite the container neck 3 in the direction of rotation. For this purpose, the sealing skirt 14 has a arranged on the outer wall 15 of the sealing skirt 14 nose 22, which engages in a korres pondierende groove 23. For this purpose, the groove 23 extends from the mouth surface 6 in the axial direction on the inner wall 7 of the container neck 3. This avoids that, prior to the welding process, the pouring attachment 11 is displaced relative to the container neck 3 in a relatively rotational manner.

Figure 9 shows a plastic container which is augebil det as a tube 25 with a tube body 26. To the tube body 26 includes a tube shoulder 27, which has a cylindrical in wesentli return 28. An outer wall 29 of the recess 28 has a circumferential rib 20 which bears against an inner wall 30 of the pouring attachment 11 under prestress. By the radiated fiber energy F, the rib 20 and a voltage applied to the rib 20 portion of the inner wall 30 is melted, so that after cooling the common melt results in a fluid-tight cohesive Ver bond. A free end 33 of the pouring attachment 11 rests against an outer side 34 of the tube shoulder 27, although this is not absolutely necessary. As a rule, the tube shoulder 27 will project beyond an outer wall 34 of the pouring attachment 11. The mouth surface 6 of the container mouth 4 is hereby spaced from the pouring attachment.

The invention has been explained using the example of the cohesive connection of a functional part designed as a pouring attachment. It is understood that instead of the radio tion part also a closure part can be laser welded to the container neck. The pouring attachment or the closure part are usually made of a polyolefin, for example polypropylene, or comprise at least in the connection region of the two joining partners a polyolefin, for example polypropylene.

The fiber welding of such components can be done without residue and can therefore be of interest especially in the Febensmittelindustrie or in the pharmaceutical industry. The above description of specific embodiments is only to explain the invention and is not to be regarded as limiting. On the contrary, the invention is defined by the claims and the equivalents to those skilled in the art and encompassed by the general inventive idea.

Claims

claims

1. A method for fluid-tightly connecting a one or more extruded at least partially thermoplastic multilayer thermoplastic tube or blown from a at least partially single or multi-layer injection molded and / or flow-molded preform blow-molded container with a container neck with a closure part or with a functional part of a thermoplasti plastic, wherein the closure part or the functional part of a first Fu partner and the container neck form a second joining partner and a connec tion area between the plastic container and the closure part or the functional part is formed in or on the container neck of the plastic container, characterized that the container neck is formed free of structurings for fes th connection of the closure part or the functional part to the container neck, that the connection between the first and the second joining partner by means of irradiated La Serenergie is created that one of the irradiated laser energy first acted on joining partner is at least partially transparent to the incident laser energy that the irradiated La serenergie is at least partially absorbed in the connection region in which the first and the second joining partners abut each other under force, and an insoluble cohesive connection between the two joining partners by melting the first joining partner and / or the second joining partner in the connection area and subsequent solidification is created, wherein the first and the second joint partners each consist of plastics, the binding area at least in the United are compatible with each other.

2. The method according to claim 1, characterized in that either the first or the second joining partner has a thermoplastic material which at least partially absorbs the irradiated laser energy.

3. The method according to claim 1 or 2, characterized in that in the connec tion area a the irradiated laser energy at least partially absorbing additive is arranged.

4. The method according to claim 3, characterized in that the additive is arranged at least on or in the first, respectively second joining partner, which is achieved by the irradiated laser energy after irradiating the second, respectively first joining partner.

5. The method according to claim 3 or 4, characterized in that the additive is applied as a coating.

6. The method according to claim 5, characterized in that the coating materials used are materials that consist of soot, contain soot and / or contain substances that at least partially absorb the laser energy.

7. The method according to any one of claims 3 to 6, characterized in that the additive is embedded in the plastic at least in the connecting region between the first and the second joining partner.

8. The method according to any one of the preceding claims, characterized in that the closure part or the functional part is preassembled material container on the container neck of the art that one of the closure part or the radio tion part projecting circumferential sealing skirt an outer wall of the Behäl terhalses the plastic container at least partially engages, wherein the outer wall and the projecting circumferential sealing skirt form the Verbindungsbe rich.

9. The method according to any one of claims 1 to 7, characterized in that the closure part or the functional part is preassembled such on the container neck of the Kunststoffbehäl ters that from the closure part or the functional part projecting circumferential sealing skirt through a container mouth into the interior of the Container neck of the plastic container protrudes and under force, which is generated by bias, abuts an inner wall of the container neck, where form the connec tion area in the inner wall and the projecting circumferential sealing skirt.

10. The method according to any one of claims 1 to 7, characterized in that a radially extending, circumferential flange of the closure part or the functional part is pressed at least during the introduction of the laser energy by applying force against an annular circumferential orifice surface, the termündung a Behäl the container neck of the plastic container bounded, wherein the radially extending, circumferential flange and the annular circumferential Mün training area form the connection area.

11. The method according to any one of the preceding claims, characterized in that the first, respectively the second joining partner in the connection region has a ring-shaped circumferential rib, which predetermines a set path of the first and / or the second joining partner, and the energy during the irradiation of the laser is melted.

12. The method according to claim 11, characterized in that the annular umlau fende rib has a tapering to its projecting free end cross section, wherein the rib has a height between about 0.05 mm and about 1.0 mm and a maximum width between about 0.1 mm to about 1.0 mm.

13. The method according to any one of the preceding claims, characterized in that the laser energy is irradiated in a region of a cone with a half opening angle of less than about 20 °, preferably less than about 7 ° and particularly preferably be less than about 2 °, wherein the central axis of the cone in the connection region is perpendicular to an outer wall of the joining part, which is acted upon by the laser energy first.

14. The method according to any one of the preceding claims, characterized in that the force is selected such that a surface pressure of the first and the second joining part in the connection region between about 5 MPa and about 35 MPa is formed.

15. The method according to any one of the preceding claims, characterized in that with the aid of the irradiated laser energy in the connecting region between the first and the second joining partner a circumferential laser welding seam he testifies that an extension between about 0.005 mm and about 0.8 mm, be Preferably between about 0.1 mm and about 0.2 mm, the transverse to the Umfangsli never the laser weld in a plane perpendicular to the direction of irradiation of the laser energy is measured.

16. The method according to any one of the preceding claims, characterized in that the connecting region of both the one or more layers in a blow molding plastic container produced as well as the connecting portion of the United locking part or the functional part are made of a plastic, the sen main component, ie 70% and more, is polar plastic, from the group consisting of PET, PET-G, PET-X, PVC, PEN, PA, PC, PU, PMMA, POM, copolymers of the cited plastics, bioplastics such as PEF or PPF , filled plastics and / or mixtures of said plastics, ge is selected.

17. The method according to any one of claims 1 to 15, characterized in that the connection region of both the one or more layers produced in a blow molding plastic container and the connecting portion of the United locking part or the functional part are made of a plastic, sen's main component, ie 70% or more, non-polar plastic is selected from the group consisting of HDPE, PP, PS, LDPE, LLDPE, PTFE, PS, copolymers of plastics led, bioplastics such as PLA, filled plastics and / or mixtures of said plastics becomes.

18. The method according to any one of the preceding claims, characterized in that a laser with a wavelength of 800 nm to 1200 nm or from 1800 nm to 2400 nm is used as a source for the irradiated laser energy.

19. The method according to claim 18, characterized in that a diode laser is used as the laser.

20. The method according to any one of the preceding claims, characterized in that for the connection of rotationally symmetrical joining partners, the laser energy is radiated substantially simultaneously over 360 °.

21. The method according to any one of the preceding claims, characterized in that the irradiated laser energy is selectively concentrated by means of shielding screens on selected angular ranges within 360 °.

22. The method according to any one of the preceding claims, characterized in that for the connection of rotationally symmetrical joining partners they are moved to irradiate the laser energy rotationally and / or translationally past a laser.

23. Plastic container, which is produced from a thermoplastic material tube extruded in one or more layers at least partially or from a single-layer or multi-layer injection-molded and / or flow-molded preform in a blow molding process and has a container body and a container neck adjoining thereto, the fluid-tight with a closure verbun or with a functional part of a thermoplastic plastic verbun is, characterized in that the plastic container at least in Ver connection area with the closure part or the functional part free of structuring rierungen for firm connection of the closure part or the functional part is forms and the fluid-tight connection between the container neck of the plastic material container and the closure part or the functional part is a created by means of laser energy cohesive connection, wherein both the plastic of the Kunststoffbehälte Rs and the plastic of the closure part or the radio tion part at least in the connection area are compatible with each other.

24. Plastic container according to claim 23, characterized in that the plastic container is formed as a tube with a tube body having a first and second end, wherein the tube body at the first end has a Tu benfalz, which is closed fluid-tight, and at the second end one Has circumferential substantially cylindrically formed recess on which the closure part or the functional part is connected in a fluid-tight non-detachable manner.

25. Plastic container according to claim 23 or 24, characterized in that the container neck or on a container mouth bounding radially erstre ckenden mouth edge an alignment aid is provided, which is designed for a positionally accurate alignment of the closure part or the functional part and with egg nem with the alignment aid corresponding positioning on the closure part or on the functional part cooperates.

26. Plastic container according to one of claims 23 to 25, characterized in that outside the connection region in the direction of the interior of the container body, a fluid-tight seal between the container neck and the United locking part or the functional part is arranged.

27. Plastic container according to one of claims 23 to 26, characterized in that both the one or more layers produced in a blow molding plastic container and the closure part or the functional part are made at least in the connection area of a plastic whose main component, ie 70% and more, is polar plastic, selected from the group consisting of PET, PET-G, PET-X, PVC, PEN, PA, PC, PU, PMMA, POM, copolymers of the led plastics, bioplastics such as PEF or PPF filled Plastics and / or mixtures of the plastics mentioned, is selected.

28. Plastic container according to one of claims 23 to 26, characterized in that both the one or more layers produced in a blow molding plastic container as well as the closure part or the functional part at least in the United binding area are made of a plastic whose main component, al so 70% or more, non-polar plastic is selected from the group consisting of HDPE, PP, PS, LDPE, LLDPE, PTFE, PS, copolymers of the cited plastics, bio-plastics such as PLA, filled plastics and / or mixtures of the plastics mentioned is.

29. Plastic container according to one of claims 23 to 28, characterized in that the functional part is a pouring attachment and an integrally formed Verschlus includes steep.