EP3856497A1

EP3856497A1 - Contour-forming welding tool for pulse welding and contour-forming pulse welding method for a medical pack formed as a bag

Info

Publication number: EP3856497A1
Application number: EP19770109.7A
Authority: EP
Inventors: Joern WITTORF; Gerald Wegner; Tobias LENHARDT
Original assignee: Fresenius Kabi Deutschland GmbH
Current assignee: Fresenius Kabi Deutschland GmbH
Priority date: 2018-09-25
Filing date: 2019-09-24
Publication date: 2021-08-04
Also published as: CN112770894A; CL2021000682A1; CN112770894B; AU2019348469A1; WO2020064675A1; US11498284B2; US20210299971A1; ZA202100793B

Abstract

The invention relates to a welding tool and to a method for pulse welding of plastic films for medical packs formed as bags. In general, the invention provides that the film material which is plastified during welding and thus free-flowing is specifically displaced into a deepened, edge-side inner region of the sealing surface by increasing the sealing surface area. The film material accumulated in the recess leads to an increase in the film thickness in the inner region (25i) of the weld seam (6, 7, 8). As a result, the mechanical stability of the medical pack formed as a bag can be improved.

Description

Contour-forming welding tool for pulse welding as well as contour-forming pulse welding process for a medical packaging designed as a bag

description

Field of the Invention

The invention relates to a welding tool for pulse welding plastic films for medical packaging designed as a bag. The invention also relates to

Pulse welding process with the mentioned welding tool for pulse welding. The invention further relates to a medical packaging designed as a bag, which is produced by the method according to the invention.

Background of the Invention

Medical bags consisting of a welded film are known. For example, polyolefin films are used to manufacture such medical packaging.

The published patent application EP 0 911 141 A2 (Fresenius Medical Care Deutschland GmbH) shows a device and a device

Process for welding foils for the manufacture of medical packaging. According to the teaching of this document, the welding jaws comprise a heated area and an adjacent cooled area. The welding jaws are pressed onto the film during the welding process. Due to the adjacent cooled area, the welding jaws always rest on an area of non-plasticized film during this welding process, so that the welding jaws are held apart by the film itself. This prevents the material of the weld seam from being displaced to the sides. The result is that the foils in the area of the weld seams have essentially the same material thickness as that

Total thickness of the adjacent superimposed foils.

It is also known to be used as a pouch

trained medical packaging a port for

Withdrawing or feeding liquids into the

To weld weld seam. A port is a connection system for removing or supplying liquids. Such a port can be provided, for example, by a hose section or by an injection molded component. For this purpose, such a port can be a so-called

Include welding boats. A welding boat is shown, for example, in the patent EP 1 605 891 B1 (Fresenius Kabi Deutschland GmbH).

Object of the invention

The invention has for its object a welding tool and a welding method and one with a

To provide medical packaging produced according to the welding method, which allow higher shape tolerances of the materials used, but at the same time the positive packaging properties are retained or even improved. In particular, the stability of the packaging in drop tests is to be improved.

Summary of the invention

The object of the invention is achieved by a welding tool, by a method for welding a film and by a medical packaging designed as a bag according to one of the independent claims. Preferred embodiments of the invention are the subject of the dependent claims, the description and the

Take drawings.

In general, the invention provides for the film material, which is plasticized by heating and thus flowable, to be displaced or displaced in a targeted manner by increasing the sealing surface into an inner, edge-side depression of the sealing surface. The displaced film material is piled up or collected there, so to speak. After the film material has solidified, this results in a thickening or reinforcement of the film in the area of the inner weld seam. The contour of the film is increased there in a cross section. That displaced

Foil material can also have shape and / or dimensional tolerances

compensate. In particular, the film material can also be displaced laterally along the weld seam by the elevation.

The invention provides a welding tool for pulse welding a plastic film of a, preferably medical, packaging. The welding tool comprises a welding jaw with a sealing strip which extends along the welding jaw and can be pressed onto the film. The sealing strip comprises a heatable sealing surface to form a weld seam in order to plasticize the plastic material of the film adjacent to the sealing surface. The welding tool is particularly characterized in that the sealing surface has an elevation and an inner, edge-side depression.

The invention is described in detail by a

Welding tool for pulse welding a plastic film of a, preferably medical, packaging, comprising

a welding jaw with a sealing strip which extends along the welding jaw and can be pressed onto the film,

the sealing bar for the formation of a weld seam comprises a heatable sealing surface in order to plasticize at least the plastic surface of the film adjacent to the sealing surface, and has an adjacent inner clamping area and an adjacent outer clamping area for clamping the film during welding of the film,

characterized in that the sealing surface has an elevation, preferably arranged in a central region of the sealing surface, in particular for displacing plasticized plastic material of the film, an edge-side inner region of the sealing surface adjacent to the inner clamping region being recessed at least in sections with respect to both inner clamping area and is arranged opposite the elevation. The central region of the sealing surface is preferably located between the inner region of the sealing surface and an outer region of the sealing surface.

Due to the elevation and the inner, edge-side depression in the sealing surface, the plasticized plastic material of the film can be specifically shifted into the inner, edge-side area of the weld seam produced and accumulated there. This will make the film thickness in this area

reinforced. The plastic material can in particular also be moved laterally along the weld seam. The

Elevation and / or the depression can be provided by profiling the sealing surface. The

For example, at least one increase

sectionally convex structure or by some kind of step. The deepening, which is also called

deepened inner area can be provided, for example, by an at least sectionally concave structure or by a kind of step. The sealing strip has on the edge side of the sealing surface the adjacent inner clamping area and the adjacent outer clamping area for clamping the film during welding of the film. This will during the

Welding a cavity is formed in the welding tool.

The inner clamping region and the outer clamping region are preferably provided during the welding at a temperature which is below a

The plasticizing temperature of the film to be welded lies. As a result, the plastic material plasticized in the area of the sealing surface cannot or can not substantially in the

Flow of the clamping area. A quasi completely closed cavity is thereby formed.

A free, directed material flow is made possible in particular by the combination of the clamping area and the profiling, in particular configured by the elevation and the depression. The material flow takes place, in particular, transversely (transversely) to the weld seam into the depression around the

Strengthen film thickness and the inner area of the weld seam, and optionally laterally (along the weld seam), e.g. Compensate manufacturing tolerances of the components (film, port, ...).

The welding tool comprises at least one, preferably two, welding jaws which can be pressed onto a film or

are. The welding jaw extends along the

Longitudinal axis of the welding jaw the sealing surface. The sealing surface can be heated in such a way as to heat and melt a plastic material of the film to be welded which is adjacent to the sealing surface.

The elevation is a structural elevation that protrudes from the surface of the sealing surface. In a In one embodiment, the elevation is provided by a plateau which protrudes from the surface of the sealing surface. The plateau can be made completely or in sections flat, inclined and / or curved, in particular in a cross-sectional view.

The increase, especially the plateau, is in one

Embodiment of the invention provided as a strip-shaped contour on the sealing surface. In particular, the increase takes up 20% to 60%, preferably 30% to 50%, of the width of the sealing surface. In particular, the plateau is provided with a width between 1.5 and 2.5 mm, preferably between 1.8 and 2.2 mm. In particular, the elevation is provided with a height between 10 and 100 μm, preferably between 20 and 60 μm. The corresponding values then result for the area of the weld seam which is reduced in thickness. In particular, the area of the weld seam which is reduced in thickness takes up 20% to 60%, preferably 30% to 50%, of the width of the weld seam. In particular, the area of the weld seam with a reduced thickness is between 1.5 and 2.5 mm, preferably between 1.8 and 2.2 mm,

produced .

The recessed inner area of the sealing surface, in particular the recess, is in one embodiment of the invention as a strip-shaped contour in the sealing surface

provided. In particular, the deepened inner takes

Range 30 to 70%, preferably 40 to 60%, of the width of the weld. In particular, the deepened inner

Area with a width between 2 and 3 mm, preferably between 2.4 and 2.8 mm, provided. In particular, the recessed inner region is provided with a depth between 10 and 100 μm, preferably between 20 and 60 μm. The corresponding values then result for the inner area of the weld seam which is enlarged in thickness. Especially The area of the weld seam which is increased in thickness takes up 30 to 70%, preferably 40 to 60%, of the width of the weld seam. In particular, the area of the weld seam which is increased in thickness is between 2 and 3 mm wide,

preferably between 2.4 and 2.8 mm.

According to the invention, the inner region on the edge is the

Sealing surface recessed in relation to the elevation and in relation to the inner clamping area. The inner area of the

Sealing surface is in particular that area of the

Sealing surface, which creates the inner edge area of the weld seam. The inner area of the weld is the area that is adjacent to the interior of the bag.

This enables a weld seam to be produced which has a greater thickness on its inside. When welding two foils, the thickness of the inner weld seam is at least in sections greater than the sum of the two individual foil thicknesses. Such a weld seam is thus made more stable. Such a filled bag demonstrates

Pressurizing a higher strength.

In particular, an edge-side, outer area of the sealing surface can also be arranged recessed with respect to the elevation and with respect to the outer clamping area. The outer area of the sealing surface is in particular that area of the

Sealing surface, which creates the outer edge area of the weld seam. The outer area of the weld seam is the area that connects to the exterior or the surroundings of the

Bag adjoins. This allows a weld to be made, both on the inside and on the inside

Outside has an increased thickness and is therefore more stable overall.

In one configuration, the edge-side, adjacent to the outer clamping area is the outer area of the sealing surface arranged higher than the inner area of the sealing surface adjoining the inner clamping area. In this

The weld seam formed is thicker on the inside than on the outside. The outer area of the sealing surface on the edge, in particular essentially, can be at the same level as the adjacent outer clamping area. This allows the outer edge

Welded area are produced with a thickness which corresponds essentially to the sum of the film thickness.

In one embodiment, the outer area of the sealing surface extends over a width of 5% - 30%, preferably 10% - 20%, of the width of the sealing surface. In particular, the outer area of the sealing surface is provided with a width between 0.2 and 1.5 mm, preferably between 0.5 and 1.0 mm. The corresponding values then result for the outer area of the weld seam. In one embodiment, the outer area of the weld seam extends over a width of 5% to 30%, preferably 10% to 20%

Width of the weld. In particular, the outer area of the weld seam is provided with a width between 0.2 and 1.2 mm, preferably between 0.4 and 0.9 mm.

The plateau lies in the middle area of the sealing surface. The plateau can be arranged approximately centrally in the sealing surface, for example. It is preferably not arranged symmetrically in the sealing strip. In one embodiment, the plateau is offset in the direction of the outer region of the

Sealing surface arranged. In cross-section, the longitudinal axis of the elevation is preferably also offset laterally outwards with respect to the longitudinal axis of the heating conductor. In

The increase ends in a direction towards the inside

Embodiment in the area of the heating conductor and extends in the direction of the outside beyond the heating conductor. Thereby sufficient heat input can be guaranteed in this area of the sealing surface.

The plateau or the elevation preferably borders on the inside of the recessed inner region of the sealing surface and in the process, preferably directly, transitions into the recessed region, in particular without an intermediate step.

In particular, in combination with the outer area of the sealing surface, which is at the same height as the outer clamping area of the sealing bar, and the inner area of the sealing surface, which is recessed relative to the elevation and the outer clamping area of the sealing bar, the increase represents a Asymmetrical step in an upper side of the sealing bar. Because the increase has a greater height in the direction of the inner sealing surface than in the direction of the outer sealing surface.

The increase in the sealing surface serves to move the softened plastic material. This is shifted in particular into the adjacent inner, recessed area of the sealing surface. A displacement volume VV can thus be assigned to the increase in the cavity formed. Analogously, the deepening or the deepened, inner area of the

Sealing surface can be assigned a recording volume AV. According to one embodiment, the displacement volume VV of the increase is larger than the absorption volume AV of the recessed inner region. This allows a sufficient amount of material to fill the recessed inner area and of

any existing defects in the film and / or a port are provided. Preferably, 1.1 AV <VV <1.5 AV.

The recessed inner area represents a depression. The inner area of the sealing surface is preferred Embodiment of the invention arranged not only in sections but completely recessed with respect to the elevation and the inner clamping area. Preferably, the

recessed, inner region of the sealing surface configured as a trench that extends along the sealing surface.

In one embodiment, the recessed, inner area of the sealing surface starts on the outside in the area of the heating conductor and extends towards the inside beyond the heating conductor (in a cross-sectional view). This ensures sufficient heat input into this inner area of the sealing surface. This also ensures that the inner end of the weld seam is in the recessed and thus in the reinforced area. The longitudinal axis of the recessed inner region of the sealing surface is preferably offset laterally inwards relative to the longitudinal axis of the heating conductor.

In a further embodiment, the recessed, inner region of the sealing surface has a section in sections

Depth decreases in the direction of the inner clamping area and merges, preferably directly, into the inner clamping area. In an alternative or supplementary embodiment, the recessed, inner region of the sealing surface has a decreasing depth in sections in the direction of the elevation and, preferably directly, merges into the elevation.

According to a further embodiment of the invention, the welding tool comprises a membrane which bulges when heated and which comprises at least the sealing surface.

Under a bulge when heated, a bulge becomes

Seal surface understood in the unloaded state, i.e. if this is not due to a counterforce caused, for example, by the material of the weld seam that cannot be displaced is present is retained.

The membrane bulges during a welding process

in particular when material flows in the weld seam and in particular can compensate cavities due to manufacturing-related shape tolerances.

The block, the part of which the membrane is preferably, is made according to one embodiment of the invention from a material with low thermal expansion, in particular from an iron-nickel alloy.

Preferably, at least the part of the block which comprises the sealing strip or the membrane consists of a material with a coefficient of thermal expansion at 20-300 ° C. of less than 10, preferably less than 5, and particularly preferably less than 2 * 10 ^_6 / K.

Furthermore, the welding tool according to one embodiment of the invention comprises a heat sink, which in particular includes

Liquid is cooled. There is a on the heat sink

electrical heating conductor attached. An upper part with the sealing strip, which extends along the heating conductor, is preferably placed on the heat sink.

In particular, the heat sink comprises a projection which projects into the block with the sealing strip or with the membrane and / or on which the heating conductor is placed. The heating conductor is arranged directly adjacent to the sealing strip or to the membrane and is preferably in direct contact with the sealing strip or with the membrane.

There is electrical insulation between the

Heating conductor and the sealing strip or membrane available. In particular, it is provided that the sealing strip or the membrane, preferably the entire underside of the block, with an insulating coating, in particular with an electrically insulating oxide layer and / or ceramic layer, such as a metal or semimetal layer,

in particular silicon oxide layer. The insulating layer preferably has a thickness of less than 50 μm, particularly preferably less than 10 μm. In particular, it is a layer deposited by means of a plasma process.

In a further embodiment of the invention, the welding tool comprises an upper part with at least one recess. This is for receiving the weld-in section,

for example the welding boat, a port

educated. The welding tool is designed in such a way that the sealing surface in the area of the weld-in section is warmer or more heatable than in one

adjacent area of the sealing surface, in which two opposing foils are welded together.

When the heating conductor is in operation, the sealing surface in the area of the weld-in section of a port is therefore heated up more, in particular at least temporarily by at least 20 ° C. Since in the area of the port, in particular in its weld-in section, the welding jaw and thus the sealing surface are not directly and only separated from the other by the two foils

Sealing surface of the opposite welding jaw

is higher in this area

Energy input is advantageous in order to plastify the material in this area at about the same speed. This enables a one-step manufacturing process. The port can be welded into the weld at the same time as the weld is being made. Various technical solutions are provided to achieve this.

According to one embodiment, the cross section of the heating conductor itself can be tapered in the area of the recess, so that it becomes hotter in the area in which the welding boat is to be connected to the film.

According to a further embodiment, the welding jaw, in particular the sealing bar or the membrane of the

Welding jaw, be formed somewhat thinner in the area of the recesses for the port, so that an improved one

There is heat transfer from the heating conductor to the sealing surface.

According to a further embodiment, the following is provided: In order to heat the sealing surface more strongly in the port area, the thickness of an insulating layer, in particular one

Silicone layer, via which the heating conductor is connected to a heat sink, is selected to be somewhat larger in this area. The heating conductor in the area of the recesses for the port is cooled less well, which results in a higher temperature during heating.

The invention further relates to the use of the welding tool described above for producing a

Bags trained medical packaging.

The welding tool described above can preferably also be used in the method described below. The above-mentioned features of the welding tool can therefore also be features of the welding method described below. The features of the welding process mentioned below can also be features of the welding tool described above. In general, the invention also relates to a method for

Welding a plastic film. In particular, the invention relates to a pulse welding method for welding the film of a medical packaging. Pulse welding is part of the manufacturing process of a pharmaceutical product. Therefore, the aforementioned method of filling can also be described as a method of manufacturing a pharmaceutical product.

The present invention is described in detail by a pulse welding method using a welding tool

Pulse welding a plastic film in a, preferably medical, packaging. In particular, the welding tool described above is used in the method. Here, a welding jaw of the welding tool with a heatable sealing surface is used to form a

Press the weld seam onto the film so that

a cavity is formed in the welding tool during the welding process, in that the film is on the edge of the

Sealing surface during the welding process by a cooler one compared to the sealing surface, which extends to the edge of the sealing surface, preferably the inner and / or outer surface

Clamping area is pinched and

plasticized plastic material of the film by an increase in the sealing area, preferably arranged in a central area, preferably at least transversely to the sealing area, into an inner section which is recessed at least in sections and adjoins the clamping area

Area of the sealing surface is shifted so that the

Film thickness in the inner area of the edge

Weld is enlarged. Preferably the inner one

The area of the sealing surface is at least partially recessed, both in relation to the inner clamping area and in relation to the elevation. In particular through the combination of the clamping area and the contour of the sealing surface, in particular the elevation and the depression, at least one is free, transverse (transverse to the weld seam) and optionally lateral (along the

Weld seam) directed material flow enables. As a result, the film thickness in the inner area of the weld seam can be increased, and thus the film in this inner area

Area to be reinforced. On the other hand, too

Manufacturing tolerances of the components (film, port, ...)

be balanced, especially without generating an uncontrolled material expulsion. In particular, all components are fully welded as long as the

All tolerance deviations less than that

Is the displacement of the increase.

The clamping area is cooler or cooler so that it is provided with a temperature that is below the

The plasticizing temperature of the film to be welded lies. In particular, the temperature of the clamping area during welding is a maximum of about 20 ° C. above room temperature. For this purpose, the welding jaw of the welding tool is preferably continuously cooled with a fluid, for example water, by means of a heat sink, and the sealing surface is heated in pulses for a limited time by means of the heating conductor.

The film thickness is the thickness of the film (s) with which the film (s) is or will be provided for welding. The film thickness in the outer area of the edge

In one embodiment, the weld seam is retained, preferably essentially, if it deviates from the thickness of the film (s) with which the film (s) was provided by at most ± 10%. When welding, a welding jaw with a heatable sealing surface is pressed onto the film, the film

is clamped on the edge side of the sealing surface during the welding process in a clamping area of the welding jaw.

In one embodiment, at least one weld-in section of a port is also welded into the weld seam, preferably simultaneously. The welding section of the port is preferably provided by a welding boat. The weld-in section can also be provided by a type of pipe or hose section. The sealing surface is preferably heated more strongly in the region in which the port is also welded in than in an adjacent region of the sealing surface in which two foils are welded together.

During the welding process, preferably both the sealing surface and one of the edges of the sealing surface

Sealing area adjoining the clamping area by a

Surface pressure exerted a force on the film.

In particular, the clamping jaw is pressed on so strongly that, at least at the beginning of the welding process, a force of 0.05 to 5, preferably 0.1 to 1 N / mm ² , averaged over the sealing surface and the clamping area, results.

By clamping the film in the clamping area, the film is a spacer for the during the welding process

Welding jaws. In the clamping area, the tool is held apart by the foils, so that it is within the

Weld seam, for example between two opposite sealing surfaces or between the sealing surface and the

Welding boat of the port, forms a closed cavity, which can be found comparable in an injection molding process. As a result, the plasticized, in particular molten plastic material is not pressed in any significant way next to the weld.

The sealing surface is first heated during a welding process, so that the plastic material adjacent to the sealing surface is plasticized in order to form a material connection. The heating is then switched off and, as soon as the plastic material has solidified, the welding jaw is lifted off. Plasticizing the plastic material is understood to mean heating that the plastic at least begins to melt into a liquid one

State to pass so that he is a cohesive

Can enter into a connection.

According to one embodiment of the invention, when the sealing surface is heated, a higher one becomes in the area of the sealing surface

Surface pressure exerted than in the clamping area. This can support the displacement or flow of the plasticized film material.

According to this embodiment of the invention, therefore, no surface pressure is applied during the welding process

Substantially the same force per area both over the

Clamping area as well as exerted over the sealing surface, but a higher force per surface is exerted in the area of the sealing surface. The force in the area of the sealing surface is preferably at least temporarily and at least in sections 1.5 times higher than in the adjacent clamping area.

On the one hand, this further ensures that a closed cavity is formed in the area of the weld seam.

At the same time, it builds up within the other

closed cavity due to the greater surface pressure in a molten material, so that the molten material can flow if necessary

Volume is present. Such a volume is present in particular through the depression in the inner region of the sealing surface. Such a volume can also be present, for example, due to manufacturing-related tolerances. Such tolerances can in particular on the outside of the

There are weld-in boats of a port. These are thus filled up in an improved manner by the material of the film to be welded. It can be done in a simple way

Welding processes are provided, which is higher

Allows manufacturing tolerances.

By liquefying the plastic material, the surface pressure is converted into a pressure in the cavity, which allows the molten material to flow into the cavities, in particular transversely (transverse to the weld seam length) and optionally laterally (in the direction of the weld seam length).

With the invention e.g. Slides are connected together. There can also be welding sections, for example welding boats, of a port between two foils

are welded, the foils changing into a molten state and integrally with the

Connect the welding section. Possible sink marks can be filled in, in particular, by the greater force per area in the area of the sealing area, that is to say in the area of the weld seam that forms.

The sealing surface is in particular designed as a heatable line or strip-shaped surface, which during a

Welding cycle is temporarily heated. The warming of the

Sealing surface can be done in particular with a resistance heated heating conductor. In order to weld the weld-in section, preferably the weld-in boat, of a port, the sealing surface together with the adjacent clamping area can have a recess. The shape of the recess is adapted to the shape of the welded-in section of a port. In one embodiment of the invention, their shape is tapered at the edges

Welding boat adapted. The welding boat is a welding section formed in a ship shape and can therefore also be referred to in short as a ship-shaped welding section.

According to one embodiment of the invention, the higher force per surface in the area of the sealing surface is achieved by a bulging membrane which encompasses the sealing surface.

exercised.

A membrane is preferably thin-walled

trained section of the welding jaw, in particular an upper part of the welding jaw, understood.

The membrane is preferably fixed at the edge. As soon as the membrane is heated during a welding cycle, it expands and, at least when there is no opposing force, bulges forward, that is, in the direction of the film on which pressure is exerted. The underside of the membrane preferably lies, in particular on a heating wire. It is only possible to bulge forward.

The force per surface in the area of the sealing surface and thus the pressure within the surface can be easily measured

closed cavity in which the weld seam is

located or formed, be increased.

The method according to the invention is in particular a

Pulse welding process. In one embodiment, the Cycle time, i.e. the time from placing the welding tool, heating the sealing surface, cooling and lifting the

Welding tool, less than 10, preferably less than 8 and particularly preferably less than 5 seconds.

The membrane is in particular designed in such a way that it bulges in the unloaded state, that is to say without counterforce through an adjacent film, at least 10 μm, preferably at least 15 μm, in the direction of the film.

The membrane is preferably part of the upper part of a

Welding jaw and is preferably in one piece with one

adjacent area of the upper part is formed.

The upper part is preferably designed as a block, which comprises the membrane. The membrane is provided by thinning the block in the area of the membrane.

During a welding process, only the sealing surface, which is part of the membrane, but not the adjacent clamping area, is heated in such a way that the film in contact

is plasticized. Because of this, the block does not expand or at least less, so that the membrane in the

Transition area to the block is clamped and bulges, since the block does not follow the expansion of the membrane.

In a further embodiment of the invention, a welding jaw with a sealing surface is used which has at least one elevation, preferably a plateau, protruding from a surface of the sealing surface and a depression.

The sealing surface, the height of which in the outer edge-side area can match the height of the outer clamping area, can therefore have a thickened area in the form of a plateau and a thinned area in the form of a depression. The elevation, preferably the plateau, is preferably designed as a plate-shaped contour or elevation which extends in the central region along the main direction of extent of the sealing surface. The middle of the

Sealing surface arranged increase lies between the inner region of the sealing surface, which is in the direction of the

Bag interior connects, and the outer area of the

Sealing surface that joins in the direction of the area surrounding the bag.

Due to the plateau, the surface pressure in the

Area of the sealing surface increased. Furthermore, material that is in the molten state can be set in motion by the plateau and possible cavities, such as e.g. the depression, fill up.

The membrane has to bulge sufficiently, but also not to be so thin that the risk of

Tear, in one embodiment of the invention there is a thickness of 100-1500 gm, preferably 300-600 gm.

According to one embodiment of the invention, a multilayer film, in particular a multilayer polyolefin film, such as a polypropylene or polyethylene film, is welded. Such multilayer films have improved properties with regard to their tear strength. It has been found that multilayer films in particular can also be securely connected by the method according to the invention.

The film used for the process preferably has a thickness of 100 to 500 gm, particularly preferably 150 to 300 gm. Regardless of whether a single-layer or multi-layer film is used, it is provided according to one embodiment of the invention that the entire film during the

Welding process is plasticized. In particular, all layers of a multilayer film can be plasticized during the welding process. All the material in the

Converted area of the weld into a molten state, with the lateral clamping of the film in the clamping area a closed volume in the area

Weld seam is generated. It doesn't have to be one

Mix the layers of the film. However, the invention can also relate to the use of a multilayer film which has a thin layer of a material which melts at a lower temperature and which is known as

Adhesive layer serves. With this configuration, the entire material does not have to be plasticized in the area of the weld seam.

The invention further relates to a bag

trained medical packaging, which can be produced in particular using the previously described method and in particular using the previously described tool. The above-mentioned features of the welding tool and / or of the welding method can therefore also be found in the features of those described below as bags

reflect trained medical packaging.

The bag comprises foils welded together. According to the invention, the bag comprises at least one weld seam, which at least in sections is opposite one

adjacent adjacent area has thinned or reduced in area. The neighboring area is divided on the one hand by an inner area on the edge

Weld seam provided. This edge-side, inner area of the weld seam is the area of the weld seam that connects to the Interior of the bag adjoins. In the case of a filled bag, this area of the weld seam borders, for example, on the liquid contained in the bag. The

edge-side, inner region of the weld seam a thickness which, preferably at least in sections, is greater than a thickness of the film provided in the event that a film and a port are welded together. In the event that two foils are welded together, the weld seam has a thickness which is greater than a total thickness of the two foils provided.

In one embodiment, the invention can be described by a medical packaging designed as a bag, which comprises foils welded together,

wherein the bag comprises at least one weld seam, which at least in sections opposite one

neighboring area of the weld seam has a reduced thickness,

wherein the neighboring area is provided by an inner edge region of the weld seam and by an outer edge region of the weld seam, and

the inner edge region of the weld seam has a thickness Di which is at least in sections greater than a total thickness of the foils welded to one another, the total thickness being the sum of the individual thicknesses D

Is slides, where

the thickness Di of the weld seam in the inner region at the edge is at least in sections 2D <Di <2.5 D and a thickness Dp of the weld seam in the area of reduced thickness is at least in sections 0.5 2D <Dp <2D and a thickness D _E of Weld seam in the outer area is at least in sections 0.8 2D <D _E <1.2 2D.

In one embodiment, the neighboring area can also be through an edge-side, outer area of the weld seam to be provided. The outer area of the weld describes the area that is adjacent to the external environment. The edge-side, outer region preferably has

Weld seam a thickness which essentially corresponds to a thickness of the film or an overall thickness of the films.

The thickness of the film describes the film thickness with which the film was provided. The total thickness describes the sum of the film thicknesses of the two films provided, which are welded together.

The thickness of the weld seam corresponds, preferably in

Essentially, the thickness of the film if it deviates by at most ± 10%. The thickness of the weld seam corresponds, preferably essentially, to the total thickness of the two foils if it deviates by at most ± 10%.

This thinned area is designed in particular as an impression of the elevation described above, for example the plateau described at the beginning. In this area, the weld is due to the pressure generated by the increase, e.g. through the plateau, reduced in thickness.

The thinned or reduced area extends in particular over a width of 20% - 60%,

preferably from 30% - 50%, the width of the weld. The thinned area can, for example, extend in a strip shape along a region of the weld seam. In particular, it can form a strip along a central region of the weld seam.

In particular, the thickness Dp of the weld seam in the area of reduced thickness, preferably at least in sections, is smaller than a sum of the individual thicknesses D of the foils. In one embodiment of the invention, the Thickness Dp of the weld seam in the area of reduced thickness, preferably at least in sections, 0.5 2D <Dp <2D, preferably 0.6 2D <D _p <0.9 2D, particularly preferably 0.7 2D <D _p <0.8 2D. If two foils of different foil thickness Dl and D2 should be welded together, 2D is replaced by the sum Dl + D2.

The thickened area is in particular designed as an impression of the depression described above. In this area, the weld seam is increased in thickness due to the material displaced by the increase. The area which is thickened or increased in thickness extends in particular over a width of 30% -70%, preferably 40% -60%, of the width of the weld seam. The raised area can, for example, extend in a strip shape along a region of the weld seam. In particular, it can form a strip along an inner, preferably edge-side, region of the weld seam. In one embodiment of the invention, the area reduced in thickness and the area enlarged in thickness run parallel to one another.

In particular, the thickness Di of the weld seam in the

thickened inner area, preferably at least

in sections, is greater than a sum of the individual thicknesses D of the foils. In one embodiment of the invention, the thickness Di of the weld seam in the reinforced region is at least in sections 2D <Di <2.5 D, preferably 1.1 2D <

Di <1.5 2D, particularly preferably 1.1 2D <Di <1.25 2D. If two films of different film thickness Dl and D2

Should be welded together, 2D is replaced by the sum Dl + D2.

In one embodiment, it generally applies that Di> D _p and that Di> D _E and, if appropriate, that D _E > D _P. In one embodiment of the weld seam, the reinforced, inner region of the weld seam is wider than the region with reduced thickness and / or wider than the outer region of the weld seam. In particular, the area reduced in thickness is wider than the outer area of the weld seam.

Furthermore, the weld seam can comprise at least one welded-in port. In particular, the weld seam can comprise a port with a welding boat.

The weld seam is preferably between 1 and 10 mm,

particularly preferably between 3 and 7 mm wide.

A sealing strip which produces the weld seam is preferably between 5 and 15, particularly preferably between 6 and 12 mm, wide.

A pharmaceutical product is also within the scope of the invention. It comprises an embodiment of a medical packaging designed as a bag, as described above. The bag is medical

Filled liquid, which preferably contains an active ingredient. A medical fluid is, for example, an intravenous fluid. Examples of one too

administering liquid are a saline solution, a glucose solution, a nutrient solution for the parenteral

Nutrition, an emulsion or the like. The active ingredients can be dissolved and / or dispersed in the liquid

available. The packaging is preferably filled via the port. After filling, the packaging is closed in a fluid-tight manner, for example by putting a cap on the port. In addition, the packaging can be sterilized after sealing, preferably autoclaved.

Brief description of the drawings The subject matter of the invention is to be explained in more detail below with reference to an exemplary embodiment with reference to the drawings in FIGS. 1 to 17.

Fig. 1 is a schematic view of a medical packaging according to the invention, which is designed as a bag.

Fig. 2 is a sectional view of the welding tool.

3 is a detailed view of FIG. 2.

3a and 3b are detailed views of FIG. 3, in which the design of the heating conductor and the limit of the clamping area are shown.

Fig. 4 is a perspective view of a welding jaw with the bag in place and the top part partially removed.

Fig. 5 is a detailed perspective view of a

Welding jaw with the upper part completely removed.

6 is an inside perspective view of the top of a welding jaw.

7 is a detailed perspective view of the area of a recess for the welding boat of a port in a welding jaw.

Fig. 7a is a perspective view of the port area of a bag which is the same as that shown in Fig. 7

Welding tool is made.

8 shows an alternative embodiment of a

Welding jaw, which is used for the welds, at where two foils are directly connected to each other (without a port weld-in boat).

Fig. 8a is a detailed view of the sealing bar of the welding jaw shown in Fig. 8.

Fig. 9 is a sectional view of the area of the sealing surface of the sealing bar shown in Fig. 8a.

FIG. 9a is a schematic sectional view SF / F of the area of a weld seam (see FIG. 1 in this regard) which is produced with the welding tool shown in FIGS. 8, 8a and 9.

FIG. 10 is an enlarged detail view of FIG. 2.

10a and 10b are detailed views of FIG. 10, in which the details of the sealing bar are shown.

FIG. 10c shows the enlarged detailed view from FIG. 10 with microscopic sectional views of the weld seam.

11 is the section SP / F of a weld seam in the area of the weld-in boat of a port (see FIG. 1), which is produced, for example, with the welding tool shown in FIG. 4.

FIG. 11a shows a detailed view of the port area of a bag which is produced with the welding tool shown in FIG. 11.

The steps of an exemplary embodiment of the method according to the invention are to be explained with reference to the flowchart according to FIG. 12. Detailed descriptions of the drawings

Fig. 1 shows a medical designed as a bag 1

Packaging as it can be made according to the invention.

In this exemplary embodiment, the bag 1 comprises two ports 2, 3, in which one port 2 is provided for supplying and another port 3 for removing liquid. The invention can also relate to bags 1 which comprise only one port 2 or 3 or a plurality of ports 2, 3 (not shown here). For example, a bag 1 can have one to four ports 2, 3. The bag 1 can, for example, with a

Be filled with saline. Such bags 1 can

especially with one that already contains active ingredients

Liquid, for example solution, can be pre-filled.

The ports 2, 3 are welded in and each include a weld-in section 5. The examples shown here show the weld-in section 5 each in the form of a weld-in boat 5 (see also FIGS. 4,

8 and 14). The welded sections 5 can also be in the form of a pipe or hose section.

The welding boats 5 are also welded into the edge of the bag during the welding of the weld 6, which is also referred to as a transverse weld seam, and are therefore covered by the film 9 from which the bag 1 is made.

The bag 1 consists, for example, of a multilayer film based on polyolefin, in particular the bag 1 consists of a polyethylene or polypropylene film. In addition to the transverse weld 6, the bag 1 is also designated by the edge-side welds, also known as longitudinal welds

Welds 7 and closed by the upper cross weld 8. In the area of the upper cross weld 8, the bag 1 here also comprises a hanger 4.

The cross section of a weld 6, 7, 8, in the two foils

9 directly welded together (without welded-in port 5) is marked with SF / F. In contrast, the cross section of a weld seam 6, in which a welding boat 5 of a port 2, 3 is also welded into the film edge, is marked with SP / F. How the welds 6, 7, 8 are formed is explained with reference to the following drawings.

2 shows a schematic sectional view of parts of the welding tool by means of which the foils 9 are welded to one another or the foils 9 are welded to the port 2, 3. In addition to the welding jaws 10a and 10b, the welding tool also includes the mechanism (not shown here) for moving the

Welding jaws 10a, 10b, a coolant supply and one

Control electronics, among other things to control the

Heating conductor 13.

To e.g. to weld two foils 9 together, the welding jaws 10a and 10b are used to form a weld seam 6,

7, 8 pressed onto the foils 9. Each welding jaw 10a, 10b comprises a heat sink 12a and 12b and an upper part 11a, 11b. The heat sinks 12a and 12b protrude into the respective upper part 11a and 11b. The upper parts 11a and 11b mentioned each comprise a sealing surface 17 and are pressed onto the foils 9.

The lower part 28a, 28b of the respective welding jaw 10a, 10b each comprises a cooling channel 29a, 29b, which extends along the cooling body 12a, 12b and over which the Cooling body 12a, 12b is continuously cooled by passing cooling liquid through it. The upper part 11a / 11b rests on the lower part 28a / 28b and is cooled by the lower part 28a / 28b.

FIG. 3 is a detailed view of FIG. 2, in which it can be seen that a heat conductor 13 is arranged on each of the heat sinks 12a, 12b. A membrane 15 is heated via the heating conductor 13 in order to close the plastic material of the foils 9

Plasticizing.

The welding process is carried out in pulse mode. The heat sink 12a, 12b is continuously with a

Liquid cooled and the heating conductor 13 heated in pulses for a limited time.

If an electric current now flows through the heating conductor 13, the membrane 15, which rests on the foils 9, heats up to a temperature of preferably 180 ° C. to 350 ° C. and plastifies the foils 9 in the region of the

Weld 6. The foils 9 are plasticized or softened in such a way that to form the weld seams 6, 7 and 8, the foils 9 glue to one another and / or the foils 9 to the weld-in section 5 of a port 2, 3.

If necessary, the surface of the

Soften the welding section 5 a little.

The boundaries 20 of the weld seam 6 illustrated here are indicated by the dashed lines. The weld seam 6 is wider than the heat conductor 13. The heat conductor 13 is preferably between 10 and 30%, particularly preferably between 15 and 25%, narrower than the weld seam 6. The heat conductor 13 is preferably between 3 and 6 mm wide. The clamping region 16 extends at the edge of the boundary 20 of the weld 6. The surface of the welding jaw 10, 10a / 10b jumps at the edge of the Clamping area 16 back, since the sealing surface 17 and

Clamping areas 16 are designed as a sealing strip 32 protruding from the surface of the welding jaw (see also FIGS. 8 and 8a).

The membrane 15 is preferably formed in one piece with the remaining upper part 11, 11a, 11b. The area of the membrane 15 comprises the sealing surface 17 of the respective welding jaw 10,

10a, 10b, 10c. The membrane 15 preferably has a thickness of only 250-600 gm and is delimited on the edge by a solid block, which together forms the respective upper part 11a,

11b form. Due to its small thickness, the membrane 15 can heat up quickly when the heating conductor 13 is switched on and, after the heating conductor 13 has been switched off, cool down again quickly due to the permanent cooling. This enables one

dynamic process. In particular, the adjacent clamping area 16 (see also below in the text) cannot heat up significantly as a result.

The membrane 15 is clamped during the heating and, if necessary due to the thermal expansion, can bulge slightly forward, ie in the direction of the film 9. As a result, a greater force per area and thus an additional pressure is exerted on the weld 6. This allows the

positive connection can be improved. This also leads to the depression 38 in the inner region 33 i

Filled sealing surface 17 and any shape and / or

Dimensional tolerances can be compensated by material flowing into these areas due to the additional pressure.

Because of the cooling, the clamping area 16 of the respective welding jaw 10a, 10b adjoining the boundary 20 of the weld seam 6 is so cold that the material in this area is not plasticized. The welding jaws 10a, 10b thus rest on the foils 9 and, due to their being in contact with the adjacent one

Clamping area 16, in which the plastic material cannot liquefy and therefore cannot be displaced, is kept at a distance such that the plasticized material is not pressed out in the area of the weld 6. During a welding process, a closed cavity in which the weld seam 6 is then formed is provided within the welding jaws 10a, 10b.

An insulating layer 14 is arranged between a heating conductor 13 and a heat sink 12a, 12b. For example, the heating conductors 13 with an insulating layer 14, in particular a silicone layer, are placed on the heat sinks 12a, 12b.

On the opposite side, the heating conductor 13 is in direct contact with the membrane 15 in order to ensure rapid heating of the membrane 15. At the same time, the membrane 15 can only curve forward when heated due to the presence of the heating conductor 13, ie in the direction of the film 9. The heating conductor 13 and / or the membrane 15 are provided with a thin insulating layer (not shown). This prevents the membrane 15 lying against the heating conductor 13 from short-circuiting the heating conductor 13. For this purpose, the side of the membrane 15 resting on the heating conductor 13 can e.g. with an insulating oxide layer or a layer or film of polymids (not

shown).

The side walls of the heat sink 12, 12a, 12b are each spaced apart by a gap 35 from the opposite side wall of a recess in the upper part 11a, 11b.

3a is a detailed view of area A of FIG. 3 according to an embodiment of the welding tool. The heating conductor 13 ends in this area. The heating conductor 13 is here by means of an insulating layer 14, for example a silicone layer, placed on the heat sink 12 / 12a.

The insulating layer 14 preferably establishes a material connection between the heating conductor 13 and the heat sink 12 / 12a. The insulating layer 14 acts as a thermal insulating layer. It can also act as an electrical insulation layer, so that in particular further electrical insulation of the

Heat sink 12 / 12a can be dispensed with.

The heat sink 12 / 12a is also continuously cooled during the welding process. Especially due to the

Insulating layer 14 heats the heating conductor 13, which is operated in the pulse mode, so strongly during a welding cycle that the membrane 15 is heated in the boundaries 20 of the weld seam 6 such that the plastic material of the

adjacent film 9 plasticized.

3b is a detailed view of area B of FIG. 3 according to an embodiment of the welding tool. In the area in which the membrane 15 heats up such that the

Plastic material is plasticized, the membrane 15 forms the sealing surface 17. The sealing surface 17 extends to the boundary 20 of the weld 6. The membrane 15 ends in a rounded transition region 30 and merges into the upper part 11a / 11b designed as a block. In this exemplary embodiment, the clamping area 16 adjoining the boundary 20 of the weld 6 begins approximately with the transition area 30.

The outer boundary 31 of the clamping area 16 is marked with a line. In this area, the sealing strip 32, which is formed from the sealing surface 17 and the clamping area 16, protrudes from the upper part 11a / 11b. FIG. 4 is a partially cut-away three-dimensional view of a welding jaw 10 on which a bag 1 is placed. For welding, as shown in FIG. 2, the bag 1 or the foils 9 with the one to be formed

Weld 6 clamped by a welding tool. The second welding jaw 10 of the welding tool is not shown here. The second welding jaw can be configured in exactly the same way as the welding jaw 10 seen here.

The upper part 11 of the welding jaw 10 and the bag 1 are hidden on the half shown on the left. Of the

Heat sink 12 protrudes into the upper part 11 and carries the heating conductor 13. The heat sink 12 is here with a

Liquid, especially with water, cooled.

The welding jaw 10 shown here is designed to also weld the port 2, 3 into the weld 6 in a welding process. For this purpose, the welding jaw 10 comprises at least one recess 19, which serves to receive the welding boat 5 of the port 2, 3. Furthermore, at least one holder 18 is provided for fixing the upper part of a port 2, 3. in the

In the area of the recess 19 for the welding boat 5, the heating conductor 13 also follows the contour of the welding boat 5.

The upper part 11 of the welding jaw 10 comprises the sealing strip 32. The sealing strip 32 provides the sealing surface 17 and the clamping area 16. For this purpose, the sealing strip 32 protrudes from the upper part 11. It represents a kind of step or elevation in the upper side of the upper part 11. The lateral limits of the sealing strip 32 are defined by the limits 31 of the clamping area 16 (see also FIG. 3b).

The sealing surface 17 that can be heated by the heating conductor 13 is provided in particular by the membrane 15. During a welding process, the sealing surface 17 heats up, whereby the plastic material of the films 9 is plasticized.

For a welding process, the heating conductor 13 is heated for a few seconds, preferably for less than 3 seconds. The current I (see also FIG. 5) flows through the heating conductor 13 in the form of a metal strip, as a result of which the heating conductor 13 heats up, despite the continuous cooling via the heat sink 12 / 12a / 12b.

The heating is then switched off and the material cools down quickly, in particular due to the heat sink 12. The cooling time until the opening of the welding jaws 10a, 10b is preferably less than 3 seconds.

The clamping area 16 of the welding jaw 10 adjoining the sealing surface 17 serves as a support on the film 9 of the bag 1 during the welding process and is permanently cooled.

5 is a perspective view of the welding jaw 10 with the upper part 11 completely removed.

The heat sink 12 comprises a base body or block 21 with the coolant connections 22, from which the upper part of the heat sink 12, which carries the heating conductor 13, protrudes. The recesses 19 each serve to receive one

Weld-in boat 5 of a port 2, 3. The upper parts of a port 2, 3 are carried by the holder 18.

The heat sink 12 is preferably made of a material with good thermal conductivity, in particular aluminum or copper or an aluminum or copper alloy.

The heating conductor 13 can be a copper strip. The heating conductor 13 can, for example, also be a Metal strips of an iron-nickel alloy, preferably with a coefficient of thermal expansion less than 5 * 10 ^_6 / K, particularly preferably less than 2 * 10 ⁶ / K (at 20 ° C to 300 ° C).

FIG. 6 is a perspective interior view of the upper part 11 of a welding jaw 10. In this illustration, in particular the membrane 15 can be seen, the opposite side of which forms the sealing surface 17. The upper part 11 has a trench, into which the heat sink 12 projects (see also FIG. 5). The upper part 11 is designed here as a solid block, in which the membrane 15 is clamped. The upper part 11 and the membrane 15 are preferably made in one piece.

The upper part 11 is preferably made of a metal with low thermal expansion, in particular of an iron-nickel alloy. The thermal linear expansion coefficient of the material in a preferred embodiment of the invention at 20 ° C to 300 ° C is less than 5 * 10 ⁶ / K, particularly preferably less than 2 * 10 ⁶ / K.

FIG. 7 is a perspective detailed view of the area of the upper part 11a, 11b, in which a recess 19 for the welding boat 5 of a port 2, 3 is present. The recess 19 is formed as a trench-shaped depression which runs transversely to the sealing strip 32 and through which the

Sealing surface 17 extends to the film 9 with the

Welding boat 5 of a port 2, 3 to weld.

In order to illustrate the basic structure in this area, the sealing strip 32 or the sealing surface 17 is shown here without a plateau 23 and also without a depression 38 in the inner area 33i. In the illustrated example of the recess 19, two spaced apart ribs 24 protrude from the sealing surface 17. However, the ribs 24 are optional and end here essentially in the area in which the recess 19 merges again into a plane which forms the sealing surface 17 in the area in which two foils 9 are welded to one another.

The sealing surface 17, the limits 20 of those to be manufactured

Weld 9 as well as the clamping area 16 and its limits 31 are illustrated here only in the plane of the sealing surface 32.

For the sake of illustration, the features listed are not shown in the recess 19. Further details of the sealing surface 17, such as the edge-side, inner region 33i of the sealing surface 17, the, preferably central, plateau 23 of the sealing surface 17 and the edge-side, outer region 33a of the sealing surface 17 have not been entered for reasons of illustration.

7a is a detailed view of the bag 1 in the area of a port 2, 3, of which the welding boat 5 is shown here. In this embodiment of a bag 1, the port 2, 3 was welded in with the tool previously shown in FIG. 7. The weld seam 6 is illustrated, which covers both the area in which two foils 9

Lie one above the other, and also runs over the welding boat 5. In this example, two impressions 27 are present in the area of the welding boat 5. These essentially correspond to the optional ribs 24 of the sealing strip 32 or the sealing surface 17. The two impressions 27 here run essentially parallel to the weld seam 6 and end in the region of the two pointed ends of the

Weld-in boat 5. The area of the weld 6 adjacent to this consists only of the foils 9 welded to one another.

FIG. 8 shows a perspective view of a further embodiment of a welding jaw 10c, which has no recesses 19 for receiving a welding boat 5 of a port 2, 3.

The welding jaw 10c shown here thus includes one

Sealing strip 32 without recesses 19 and serves in particular to form the weld seams 7 and 8 shown in FIG. 1. The basic structure of this welding jaw 10c essentially corresponds to the structure of the one described above

Welding jaws 10, 10a and 10b. The sealing strip 32 protrudes from the upper part 11 of the welding jaw, which is designed here in particular as a block.

8a is a schematic detailed view of area A of FIG. 8, showing sealing strip 32.

The sealing strip 32 is delimited by the boundaries 31 of the clamping areas 16, 16i, 16e. The boundaries 20 of the weld 6, 7, 8 define the extent of the sealing surface 17 (see also FIGS. 3, 3a and 3b). The boundaries 20 of the weld 6, 7, 8 are defined by the clamping areas 16, 16i, 16e.

The inner clamping area 16i delimits or defines an edge-side, inner area 33i of the sealing surface 17. The edge-side, inner area 33i of the sealing surface 17 generates the edge-side inner area 25i of the weld 6, 7, 8 during welding. The inner area 25i borders the edge Weld seam 6, 7, 8 on the interior of the bag 1.

The outer clamping region 16e delimits or defines an edge-side, outer region 33e of the sealing surface 17. The edge-side, outer region 33e of the sealing surface 17 generates the edge-side outer region 25e of the weld 6, 7, 8 during welding. The edge region is bordered by the outer region 25e Weld 6, 7, 8 to the external environment or the

Bag exterior 1. Within the sealing surface 17 shown here, a plateau 23 and a depression 38 additionally extend over the sealing strip 32 in the inner region 33i of the sealing surface 17, the design and function of which are described below.

Fig. 9 is a sectional view taken along that in Fig. 8a

drawn in, dashed line in area B of

Sealing strip 32. The cut is made in a plane perpendicular to the main direction of extent of the sealing strip 32.

The cross section of an upper side section of the sealing strip 32 or the membrane 15 is shown, over which the sealing surface 17 and the clamping regions 16e and 16i extend. The two outer limits 31 of the clamping areas 16e and 16i are not shown here.

In this exemplary embodiment, the sealing surface 17 or the membrane 15 in the region of the sealing surface 17 is not completely flat over the entire width. The sealing surface 17 comprises a plateau 23 and one, preferably on the

Plateau 23 adjoining depression 38. Plateau 23 provides an essentially central region of sealing surface 17. The recess 38, on the other hand, provides an inner region 33i of the sealing surface 17 on the edge.

The boundaries 20 of the weld seam 6, through which the edge of the sealing surface 17 is also defined, run in such a way that the plateau 23 and the depression 38 lie within the weld seam 6.

The plateau 23 is designed in this embodiment in particular as a plate-shaped plane. The plateau 23 extends like a web or strip along the

Main direction of extent of the sealing surface 17. The plateau 23 protrudes over the outer clamping area 16e and the inner one

Clamping area 16i of sealing strip 32. It is designed as a kind of step or elevation in the top of the sealing strip 32, in particular the sealing surface 17 and / or the membrane 15.

Adjacent to the plateau 23, the sealing surface 17 also comprises the areas 33i and 33e.

The area 33e is the edge-side, outer area of the

Sealing surface 17. This is the region 33e of the sealing surface 17, which produces or provides the outer (external) region 25e of the weld seam 6, 7, 8. This is the area 25e of the

Weld 6, 7, 8, which is adjacent to the outside of the bag 1. In this exemplary embodiment, the edge-side, outer region 33e of the sealing surface 17 lies at a height or essentially at a height with the adjoining outer one

Clamping area 16e and in particular also with the inner

Clamping area 16i.

Said region 33i is the inner region of sealing surface 17 on the edge. This is region 33i of sealing surface 17, which produces or provides the inner region 25i of weld 6, 7, 8. This is the area 25i

Weld 6, 7, 8, which is adjacent to the interior of the bag 1. The recess 38 is arranged in the inner region 33i of the sealing surface 17. The inner region is preferably formed by the depression 38. The recess 38 or the inner region 33i of the sealing surface 17 is arranged recessed both in relation to the inner clamping region 16i and in relation to the plateau 23. The recess 38 or the inner region 33i of the sealing surface 17 is here also recessed both in relation to the outer region 33e the

Sealing surface 17 and also with respect to the outer clamping area 16e. The recess 38 or the recessed inner region 33i of the sealing surface 17 is designed in the exemplary embodiment in particular as a type of trench. The depression 38 extends along the main direction of extent of the sealing surface 17. The depression 38 has in the direction of the inner one

Clamping area 16i has a decreasing depth and merges, preferably directly, into the inner clamping area 16i. The depression 38 also has a decreasing depth in the direction of the plateau 23 and merges, preferably directly, into the plateau 23 arranged in the central region of the sealing surface 17. The dotted horizontal line illustrates the height profile of the sealing strip 32 or the sealing surface 17, in particular the plateau 23 and the depression 38, with respect to the inner clamping area 16i and the outer clamping area 16e.

The plateau 23 thus represents an asymmetrical step in the top of the sealing strip 32. The plateau 23 has a greater height in the direction of the recess 38 than in the direction of the outer region 33e sealing surface 17.

In the area of the plateau 23, an additional pressure is exerted on the film 9 during the welding process. Due to the plateau 23, the pressure per surface is greater in this region of the sealing surface 17 than in the adjacent outer region 33e and the inner region 33i of the sealing surface 17.

On the one hand, the plateau 23 presses the film 9 more strongly in the area of the weld 6, 7, 8. The melted, molten plastic material can thereby flow into possible cavities that may be present due to shape and / or dimensional tolerances. It is essential, however, that the melted, molten plastic material can flow into the adjacent recess 38. The plateau 23 pushes the molten material due to the higher Pressure into the recess 38. Material is introduced into the recess 38 in a targeted manner. After the material has cooled and solidified, this leads to a targeted thickening of the film 9 in the inner region 25i of the weld seam 6, 7, 8 at the edge. The increased film thickness in the inner region 25i of the weld seam 6, 7, 8 enables the mechanical Properties of the bag produced, in particular in the case of dynamic loading, such as, for example, a fall of the bag onto a hard surface, can be significantly improved. The inner area 25i of the weld seam 6, 7, 8 represents the force input area when falling. Due to the increased film thickness in this area, the bag is more stable.

The cross section of a weld seam 6, 7, 8 produced in this way is shown schematically in FIG. 9a.

9a shows the sectional view of a weld 6, 7, 8 of a bag 1, which is the same as that in FIGS. 8, 8a and 10

shown welding tool was manufactured in the

Area in which two foils 9 are welded together (see section SF / F in FIG. 1). On the side shown here on the left, the weld seam 6, 7, 8 borders on the enclosed interior of the bag 1. On the side shown here on the right, the weld seam 6, 7, 8 borders on the external space or the surroundings of the bag 1. The two foils 9 are not welded to the left and right of the boundaries 20 of the weld seam 7.

The contour or the profile of the weld 7 is an impression of the contour or the profile of the

Sealing surface 17. The dotted horizontal line illustrates the height profile of the weld seam 6, 7, 8, in particular of the central region 26 of reduced thickness and of the inner region 25i, 39 of increased thickness on the edge, in relation to the outer region 25e of the weld seam 6, 7, 8th. In the middle part of the weld 7 there is a thinned area 26, on the one hand the outer, non-thinned neighboring area 25e and the inner thickened

Adjacent area 25i. The thinned area 26 represents the impression of the plateau 23. In contrast, the thickened area 25i (shown here on the left) represents the impression of the depression 38. The one on the interior of the bag 1

The adjacent weld area 25i and the weld area 25e (shown here on the right) adjacent to the (external) environment of the bag 1 have a greater thickness than the thinned area 26. The greater thickness Di of the weld seam 6, 7, 8 in the inner space adjacent to the interior Area 25i has proven to be extremely beneficial to the stability of the

Weld 6, 7, 8 proven.

In the outer region 25e of the weld 6, 7, 8, the welded film has a thickness D _E which essentially corresponds to the sum of the two individual film thicknesses.

In the direction of its inside, the weld 6, 7, 8 merges into an area 26 of reduced thickness Dp. The thickness in this area 26 is smaller than the sum of the two individual film thicknesses. This reduced thickness Dp results from the material displacement through the plateau 23 of the sealing surface 17. A reduced thickness in this central area is important for the mechanical stability of the bag 1 or the weld seam 6,

7. 8 rather uncritical. The forces apply to pressure loads or dynamic loads, e.g. in the drop test, mainly on the edges at the welds 6, 7, 8.

In particular, the forces act on the inner region 25i of the weld 6, 7, 8.

Further in the direction of the inside of the weld 6, 7, 8, the area 26 of reduced thickness extends into the inner edges on the edge Area 25i of the weld 6, 7, 8 over. The inner region 25i of the weld seam 6, 7, 8 has a greater thickness Di than the two regions 26 and 25e with Di> D _E and Di> D _p , in particular at the edge of the bag interior. The thickness Di of the weld 6, 7, 8 in this thickened or reinforced

Area 25i is larger than the sum of the two individual film thicknesses D.

The thickness Di of the weld 6, 7, 8 in the reinforced region 25i is preferably at least in sections 2D <Di <2.5 D, preferably 1.1 2D <Di <1.5 2D, particularly preferably 1.1 2D <Di < 1.25 2D. The width of the reinforced inner region 25i preferably substantially corresponds to the width of the depression 38 (see below for this).

The thickness Dp of the weld 6, 7, 8 in the region 26 of reduced thickness is preferably at least in sections 0.5 2D <D _p <2D, preferably 0.6 2D <D _p <0.9 2D, particularly

preferably 0.7 2D <D _p <0.8 2D. The width of the region 26 of reduced thickness or thickness preferably corresponds to

Essentially the width of the plateau 23 (see

hereinafter).

The thickness DE of the weld seam 6.7 in the outer 25e is preferably at least in sections 0.8 2D <D _E <1.2 2D, preferably 0.9 2D <DE <1.1 2D, particularly preferably 2D «DE.

The width of the outer region 25i preferably substantially corresponds to the width of the outer region 33e of the

Sealing surface 17 (see below for this).

10 is an enlarged detail view of FIG. 2. FIG.

10a and FIG. 10b are again detailed views of the left and right sides from FIG. 10. Further details of the profiled sealing surface 17 are explained on the basis of these representations. The sealing strip 32 delimited by the outer boundary 31 of the clamping regions 16 is preferably between 5 and 15 mm, particularly preferably between 6 and 12 mm, wide.

In a preferred embodiment, the plateau 23 has a height of more than 10 gm and / or less than 100 gm, preferably less than 60 gm (relative to the clamping area 16e), and / or a width of 1.5 mm to 2.5 mm, preferably 1.8 mm to 2.2 mm.

This eliminates the risk of larger quantities

molten plastic in the adjacent clamping area

16 are pushed in. The adjacent chilled

Clamping area 16 is closed anyway due to the film 9 lying thereon.

Because the membrane 15 is very thin overall, it is elastic and can in turn avoid pressure in the volume formed by the molten plastic.

The plateau 32 is in a central area of the sealing surface

17 between the edge-side inner area 33i and the edge-side outer area 33e of the sealing surface 17

arranged. The plateau 23 or its longitudinal axis is not positioned centrally in the sealing surface 17 but laterally offset to the outside.

The plateau 23 is narrower than the entire width of the

Sealing surface 17. The width of the sealing surface 17 is in particular 3 mm to 6 mm. The plateau 23 is preferably also narrower than the heating conductor 13, in particular 0.2 to 0.8 mm narrower. The boundaries 34 of the heating conductor 13 are marked with a dashed line. The heating conductor 13 itself is narrower than the welding seam 6, 7, 8, since the membrane 15 also adjoins to the side so closely to the heating conductor 13 heated that the material of the film 9 is plasticized up to the limit 20 of the weld 6.

In a view of the sealing strip 32, the plateau 23 and / or the depression 38 are positioned overlapping with the heating conductor 13. As a result, sufficient heat can be introduced into these two areas to produce their welds 6,

7, 8 are guaranteed. Up to 90% of the width of the plateau 23 is preferably in the region of the heating element 13.

Preferably up to 40% of the width of the depression 38 lies in the area of the heating element 13.

In contrast, in this embodiment, the outer region 33e of the sealing surface 17 on the edge lies completely outside the heating conductor 13. Nevertheless, a sufficiently high one can still be used

Heat input can be provided. The edge-side outer region 33e of the sealing surface 17 has a smaller width than the edge-side inner region 33i of the sealing surface 17. The edge-side outer region 33e also has the

Sealing surface 17 has a smaller width than the plateau 23 of the sealing surface 17. The edge-side outer region 33e of the sealing surface 17 preferably has a width of 0.5 mm to 1 mm.

The plateau 23 has a decreasing height towards the outside of the sealing surface 17 and merges, preferably uniformly, into the outer region 33e of the sealing surface 17. The plateau 23 preferably also has a decreasing height in the direction of the inside of the sealing surface 17 and merges, preferably uniformly, into the inner region 33i of the sealing surface 17. The plateau 23 preferably has a height of 35 gm to 60 gm in sections or at least in sections.

In a preferred embodiment of the invention, the amount of the (maximum) depth of the recess 38 is less than that Amount of the (maximum) height of the plateau 23 (relative to the two clamping areas 16i and 16e). Preferably, the

Indentation 38, at least in sections, has a depth of 30 gm to 50 gm. The height difference between the highest point of plateau 23 and the lowest point of indentation 38 thus lies in a range of 70 gm to 110 gm. The width of indentation 38 here preferably corresponds to Essentially the width of the plateau 23.

Towards the inside of the sealing surface 17, the depth of the depression 38 decreases, preferably uniformly, and then merges into the inner clamping area 16i. The inner clamping area 16i defines the inner limit of the weld seam. The inner one

The clamping area 16i can be somewhat reduced in height. This allows air to escape. On the other hand, this results in a transition from the top of the inner region 25i which is not or less sharply defined

Weld 6.7 to the top of the unwelded

Foil section (see also Fig. 10c).

Based on its height, width and length, the arithmetic displacement volume VV can be assigned to the plateau 23. Correspondingly, a mathematical receiving volume AV can also be assigned to the recess 38. In one embodiment, the displacement volume VV of the plateau 23 is selected to be larger than the receiving volume AV of the recess 38. Preferably, 1.1 AV <VV <1.5 AV. In an approximation, the displacement volume VV of the plateau 23 and the receiving volume AV of the depression 38 can be determined by calculating the areas of VV and AV in the cross section of the weld 6, 7, 8 (as illustrated in FIG. 10).

FIG. 10c shows again the enlarged detailed view from FIG. 10 with microscopic sectional views

different sections of the weld 6, 7, 8. As an example, two foils 9 with a thickness D of 195 gm were used here. The weld seam 6, 7, 8 has a thickness D _E of about 390 gm in the outer region 25e of the weld seam 6, 7, 8 and thus corresponds to the sum of the individual thicknesses of the film 9. The thickness Dp in the region 26 of reduced thickness

Weld 6, 7, 8 to about 280 pm to about 295 pm

decreased. As a result of the recess 38, the thickness Di in the inner region 25i of the weld seam 6, 7, 8 on the edge has increased to approximately 450 μm to approximately 500 μm. It generally applies here that Di> Dp and that Di> D _E and that D _E > D _P.

FIG. 11 is the section SP / F of a weld seam 6 in the region of the weld-in boat 5 of a port 3 (see FIG. 1), which was produced, for example, with the welding tool shown in FIG. 4. On the side shown here on the right, the weld seam 6 borders on the enclosed interior of the bag 1. On the side shown here on the left, the weld seam 6 borders on the external space or the surroundings of the bag 1.

The weld seam 6 has within its limits 20 a thinned area 26, which is present due to the impression of the plateau 23, and a reinforced area 39, which is present due to the profile of the depression 38.

The thinned area 26 lies essentially centrally in the weld seam 6. Adjacent to the thinned area 26 is a neighboring area 25i in which the film 9 is reinforced or thickened, and a neighboring area 25e in which the film 9 is essentially not thinned , available. In these areas 25i and 25e too, the film 9 is welded to the port 2, 3 or its welding boat 5, or

connected. The greater thickness in the inner edge area 25i the weld 6 has been found to be advantageous for the

Overall stability of the weld 6 has been demonstrated.

FIG. 11 a now shows a detailed view of the port area of a bag 1, which was produced, for example, with the welding tool shown in FIG. 11. The weld seam 6 extends here over the edge of the bag 1 and over the port 2, 3 or its weld-in section 5.

12 is a flowchart of the process steps of a

Embodiment of an inventive

Welding process.

The welding process is as non-continuous

Pulse process, especially with permanent cooling, executed.

First, the film 9 is fed between the welding jaws 10, 10a, 10b, 10c of the welding tool.

The two welding jaws 10, 10a, 10b, 10c are then pressed together or closed. The closed state is first defined by the abutment of the plateaus 23.

The plateaus serve as a kind of spacer. In this state, the clamping areas 16 of the upper and lower welding jaws 10, 10a, 10b, 10c preferably do not yet come to a stop.

The respective heating conductor 13 is heated. The sealing surfaces 17 are heated by the heating conductor 13. The heating is such that the foils 9 are plasticized in the area of the sealing surfaces 17. The plateaus 23 can be immersed in the now flowable film material. The welding jaws 10, 10a, 10b, 10c thereby close completely. The clamping areas 16 are now separated from each other by the foils 9. The Clamping areas 16 are so cool or cooled that the

Films 9 are not plasticized there. This creates a more closed space.

By immersing the plateaus 23 in the plasticized films 9, liquid film material is specifically displaced. The film material is displaced into the depressions 38 and in particular also laterally along the weld seam 6, 7, 8. The film material displaced into the depressions 38 leads to a targeted increase in the film thickness in the inner region 25i of the weld 6, 7, 8 at the edge. The film material, in particular laterally displaced, can also have any shape and / or dimensional tolerances in the films 9 and / or equalize in ports 5 or fill them up. In contrast, the film thickness is essentially retained in the outer edge region 25e of the weld 6, 7, 8.

The membrane 15 of the welding jaws 10, 10a, 10b, 10c can bulge and exert additional pressure on the welding seam 6, 7, 8. According to another embodiment of the invention, the heating conductor 13 can also be heated before the welding jaws 10, 10a, 10b, 10c are pressed together.

Then the power supply to the heating conductor 13 is switched off and the weld 6 cools, among other things, due to the

preferably continuously running coolant supply, so that the welding tool can be opened when the

Material of the films 9 has sufficiently solidified again.

Seen overall, the method according to the invention can be carried out using a combination of seam welding and injection molding

be compared. By clamping the film 9, a closed area is formed in which the material is molten during the welding process. By adapting the contour of the sealing surface 17 of the welding jaw in this area, it is possible to specifically change the contour of the weld 9 or the contour of the foils 9 in the area of the welds 6, 7, 8

Weld 6, 7, 8 can be increased significantly. In addition, the

Susceptibility of a pulse welding process for welding plastic foils to shape and size tolerances, in particular to shape and size tolerances

ports to be welded in can be significantly reduced.

Reference character list

1 bag

2 port

3 port

4 hangers

5 welding section or welding boat

6 weld seam (cross weld seam)

7 weld seam (longitudinal weld seam)

8 weld seam (cross weld seam with hanger)

9 slide

10, 10a, 10b, 10c welding jaw

11, 11a, 11b upper part

12, 12a, 12b heat sink

13 heating conductors

14 insulating layer

15 membrane

16 clamping area

16i Inner clamping area

16e Outer clamping area l7 sealing surface

18 holders

19 recess

20 Limit of the weld seam

21 block

22 Coolant connection

23 plateau

24 rib

25 Neighboring area to the thinned area

25i inner edge area of the weld seam (adjacent to the interior of the bag)

25e edge-side, outer area of the weld seam (adjacent to the external environment of the bag)

26 Reduced or thinned area in the weld seam

27 Imprint of the rib in the weld seam 28a, 28b lower part

29a, 29b cooling channel

30 transition region (of the membrane)

31 Limit of the clamping range

32 sealing strip

33 Outer area of the sealing surface

33i Inner area of the sealing surface on the edge

33e Edge-side, outer area of the sealing surface

34 Limit of the heating conductor

35 Gap between the heat sink and the upper part

36 transition from plateau to depression (or inner area of the weld seam)

37 transition plateau - outer area of the weld)

38 deepening

39 Increased or strengthened area in the

Weld

Claims

Expectations :

1. welding tool for pulse welding a film (9) made of plastic of a medical packaging (1), comprising a welding jaw (10) with a sealing bar (32) which extends along the welding jaw (10) and can be pressed onto the film (9),

wherein the sealing strip (32) for forming a weld seam (6, 7, 8) comprises a heatable sealing surface (17) in order to at least to the sealing surface (17)

adjacent plastic material to the film (9)

Plasticizing, and having an adjacent inner clamping area (16i) and an adjacent outer clamping area (16e) for clamping the film (9) during the welding of the film (9) on the edge side of the sealing surface (17),

characterized in that the sealing surface (17) has an elevation (23) arranged in a central region, an edge-side, on the inner

Clamping area (16i) adjacent inner area (33i) of the sealing surface (17) is at least partially recessed both with respect to the inner clamping area (16i) and with respect to the elevation (23).

2. Welding tool according to the preceding claim, characterized in that the elevation (23) is provided by a plateau (23) which protrudes from a surface of the sealing surface (17), and / or that the recessed inner region (33i) is provided as a trench.

3. Welding tool according to one of the preceding claims, characterized in that an edge-side, on the outer clamping region (16e) adjacent, outer region (33e) of the sealing surface (17) deepens both with respect to the outer clamping area (16e) as well as opposite

Elevation (23) is arranged or that an edge-side, outer region (33e) adjoining the outer clamping region (16e) of the sealing surface (17) is recessed with respect to the elevation (23) and is essentially level with the outer clamping region (16e) is.

4. Welding tool according to one of the preceding claims, characterized in that the edge-side outer region (33e) adjoining the outer clamping region (16e) of the sealing surface (17) is higher than the inner region (33i) adjoining the inner clamping region (16i). the sealing surface (17) is arranged.

5. Welding tool according to one of the preceding claims, characterized in that a longitudinal axis of the elevation (23) with respect to a longitudinal axis of a heating conductor (13) is arranged laterally offset to the outside.

6. Welding tool according to one of the preceding claims, characterized in that the elevation (23) ends on the inside in the region of a heating conductor (13) and extends on the outside beyond the heating conductor (13), preferably wherein the elevation ( 23) on its inside adjoins the recessed, inner region (33i) of the sealing surface (17) and preferably merges directly into the recessed region (33i).

7. Welding tool according to one of the preceding claims, characterized in that the recessed, inner

Area (33i) of the sealing surface (17) to the outside in the area of the heating conductor (13) starts and towards

Extends beyond the heating conductor (13) on the inside and / or that a longitudinal axis of the recessed, inner region (33i) of the sealing surface (17) is opposite a Longitudinal axis of the heat conductor (13) is laterally offset inwards.

8. Welding tool according to one of the preceding claims, characterized in that the recessed, inner

Area (33i) of the sealing surface (17) has a decreasing depth in sections in the direction of the inner clamping area (16i) and, preferably directly, merges into the inner clamping area (16i) and / or has a decreasing depth in sections in the direction of the elevation (23) and, preferably directly, passes into the elevation (23).

9. Welding tool according to one of the preceding claims, characterized in that the increase (23)

Has displacement volume VV and the recessed inner region (33i) has a receiving volume AV, the displacement volume VV of the elevation (23) being greater than the receiving volume AV of the recessed inner region

(33i).

10. Welding tool according to one of the preceding claims, characterized in that the upper part (11) of the

Welding tool has at least one recess (19) which is designed to receive a weld-in section (5) of a port (3, 4).

11. Use of a welding tool according to one of the

The preceding claims for producing a medical packaging designed as a bag (1).

12. Pulse welding process with a welding tool for

Pulse welding a plastic film (9) of a medical packaging, in particular according to one of the preceding claims, wherein a welding jaw (10) of the welding tool with a heatable sealing surface (17) to form a

Weld seam (6, 7, 8) is pressed onto the film (9) in such a way that

a cavity is formed in the welding tool during welding, in that the film (9) on the edge side towards the sealing surface (17) during the welding process is cooled by a cooler surface compared to the sealing surface (17),

is clamped on the edge side on the sealing surface (17) extending inner and outer clamping area (16, 16i, 16e) and

plasticized plastic material of the film (9) is displaced by an elevation (23) of the sealing strip (17) into an inner area (33i) of the sealing surface (17), which is recessed at least in sections and borders on the clamping area (16), so that a

Film thickness in an edge-side inner area (25i) of the weld seam (6, 7, 8) is increased, the inner area (33i) of the sealing surface (17) being recessed at least in sections both with respect to the inner clamping area (16i) and with respect to the elevation ( 23) is arranged.

13. pulse welding method according to the preceding claim,

characterized in that the welding jaw (10) of the welding tool is continuously cooled with a fluid by means of a heat sink (12a, 12b) and the

Sealing surface (17) is heated in pulses for a limited time by means of a heating conductor (13).

14. Pulse welding process according to one of the preceding

Claims, characterized in that at least one port (3, 4) is also welded into the weld seam (6).

15. pulse welding method according to the preceding claim, characterized in that the sealing surface (17) in the area in which the port (3, 4) is welded is heated more than in an adjacent area of the sealing area (17) in which two Films (9) are welded together.

16. Pulse welding process according to one of the preceding

Claims, characterized in that the packaging is filled with a medical liquid, preferably containing an active ingredient, preferably via the port (3, 4) and sealed after filling, and in particular is sterilized, preferably autoclaved, after sealing.

17. Medical packaging designed as a bag (1), which comprises foils (9) welded together,

in particular producible with a method and / or with a welding tool according to one of the preceding claims,

the bag (1) having at least one weld seam (6,

7, 8) which, at least in sections, comprises a neighboring area (25, 25i,

25e) the weld seam (6, 7, 8) has a reduced area (26),

wherein the neighboring area (25) by a

edge-side, inner area (25i) of the weld seam (6,

7, 8) and by an edge-side, outer region (25e) of the weld seam (6, 7, 8) and

the inner edge area (25i) of the weld seam (6, 7, 8) has a thickness Di which is at least

is greater in sections than a total thickness of the foils (9) welded together, the

Total thickness is the sum of the individual thicknesses D of the foils, where at least the thickness Di of the weld seam (7, 8) in the inner region (25i) on the edge

in sections 2D <Di <2.5 D and

a thickness Dp of the weld seam (7,8) in the region (26) of reduced thickness is at least in sections 0.5 2D <Dp <2D and

a thickness D _{E of} the weld seam (7, 8) in the outer region (25e) is at least in sections 0.8 2D <D _E <1.2 2D.

18. A medical packaging designed as a bag (1) according to one of the two preceding claims, characterized

characterized in that the reduced-thickness region (26) stripes along a region of the

The weld seam (6, 7, 8) extends and / or the area (25i) with an increased thickness extends in a strip shape along a region of the weld seam (6, 7, 8).

19. The medical packaging designed as a bag (1) according to one of the preceding claims, characterized in that a thickness Di of the weld seam (6, 7, 8) in the inner region (25i) is at least in sections greater than a thickness Dp of the weld seam ( 6, 7, 8) in the region (26) of reduced thickness and greater than a thickness D _{E of} the weld seam (6, 7, 8) in the outer region (25e).

20. A medical packaging designed as a bag (1) according to one of the preceding claims, characterized in that a thickness D _{E of} the weld seam (6, 7, 8) in the outer region (25e) is at least in sections greater than a thickness Dp of the weld seam (6, 7, 8) in the area (26) of reduced thickness.

21. A medical packaging designed as a bag (1) according to one of the preceding claims, characterized in that a thickness Di of the weld seam (6, 7, 8) in the thickened, inner region (25i) at least

is greater than a sum of the

individual thicknesses D of the foils (9) and / or

that a thickness Dp of the weld seam (6, 7, 8) in the region (26) of reduced thickness is at least in sections smaller than a sum of the individual thicknesses D of the foils (9) and / or

that a thickness D _{E of} the weld seam (6, 7, 8) in the outer region (25e) at least in sections in

Essentially corresponds to a sum of the individual thicknesses D of the foils (9).

22. A medical packaging designed as a bag (1) according to one of the preceding claims, characterized in that a thickness Di of the weld seam (7,8) in the reinforced area (25i) at least in sections 1.1 2D <Di <1.5 2D , preferably 1.1 2D <Di <1.25 2D, and / or

that a thickness Dp of the weld seam (7,8) in the region (26) of reduced thickness is at least in sections 0.6 2D <D _p <0.9 2D, preferably 0.7 2D <D _p <0.8 2D, and /or

that the thickness D _{E of} the weld seam (7, 8) in the outer region (25e) is at least in sections 0.9 2D <D _E <1.1 2D, preferably 2D «D _E.

23. A medical packaging designed as a bag (1) according to one of the preceding claims, characterized by at least one in the weld seam (6) via one

Welded-in section (5) welded-in port (2, 3), in particular wherein the edge-side, inner region (25i) of the weld seam (6, 7, 8) has a thickness which is at least in sections greater than a thickness of the welded film (9).

24. Pharmaceutical product comprising a medical packaging designed as a bag (1) according to one of the preceding claims, wherein the bag (1) is filled with a medical liquid, preferably containing an active ingredient.