DE102019127017A1 - Process for making a preform - Google Patents

Abstract

The invention relates to a method for producing a preform which comprises at least two layers, the preform being suitable and intended for producing a container which has an outer container and an inner container, the container being suitable and intended for storing a particularly medical or pharmaceutical fluid The method comprises the following method steps: a) introducing a mold core into a first mold cavity, so that a first cavity is formed; b) injecting a first plastic into the first cavity, whereby a first layer is formed, the first mold cavity is designed such that the first layer comprises at least one projection; c) introducing the mold core into a second mold cavity, so that a second cavity is formed; d) injecting a second plastic into the second cavity, whereby a second layer is formed, wherein the first and the second Plastic does not enter into a cohesive connection and the first plastic has a higher elasticity than the second plastic, the at least one projection of the first layer being partially surrounded by the second layer, with at least one recess device being provided which rests against the at least one projection, see above that the second layer has at least one recess into which the at least one projection of the first layer protrudes; e) cooling the preform; f) removing the preform from the mold.

Description

The present invention relates to a multicomponent injection molding process for producing a preform which comprises at least two layers, the preform being suitable and intended for producing a container which has an outer container and an inner container.

Such containers with an inner container or inner bag are known, for example, for use with cosmetics. The inner bag can be subjected to an internal pressure by a dispenser device, the inner container usually has a higher elasticity than the outer container and is accordingly deformed or compressed as a result of the application of pressure. Thus, a predetermined amount of the medium can be conveyed out of the inner bag. The deformation of the inner bag creates an undesirable negative pressure between the inner bag and the outer bag. Such a negative pressure affects the emptying process of the inner bag. A greater negative pressure d would be required to deliver the fluid. H. stronger pumping is necessary. On the one hand, this is uncomfortable for the user and, on the other hand, higher pressures can influence the permeability of the inner container or place unnecessary mechanical stress on the inner container. It is therefore necessary to provide pressure equalization openings in the outer container, which allow ventilation of the area between the inner container and the outer container.

Such containers are produced by the manufacturer in various forms, for example by a coextrusion blow molding process, and then supplied to the appropriate filling company. Since the filling companies usually want different shapes of the containers, the manufacturer of the containers must be able to produce a variety of shapes. Furthermore, the storage, the packaging and the transport must be adapted to the different shapes in each case.

The object of the present invention is therefore to overcome the disadvantages mentioned at the beginning.

1. a) Einbringen eines Formkerns in einen ersten Formhohlraum, so dass eine erste Kavität gebildet wird;
2. b) Einspritzen eines ersten Kunststoffs in die erste Kavität, wodurch eine erste Schicht gebildet wird, wobei der erste Formholraum derart ausgebildet ist, dass die erste Schicht zumindest einen, vorzugsweise nach außen ragenden, Vorsprung umfasst;
3. c) Einbringen des Formkerns, auf welchem vorteilhafterweise die erste Schicht angeordnet ist, in einen zweiten Formhohlraum, so dass eine zweite Kavität gebildet wird;
4. d) Einspritzen eines zweiten Kunststoffs in die zweite Kavität, wodurch eine zweite Schicht gebildet wird, wobei der erste und der zweite Kunststoff keine stoffschlüssige Verbindung eingehen und der erste Kunststoff eine höhere Elastizität als der zweite Kunststoff aufweist, wobei der zumindest eine Vorsprung der ersten Schicht abschnittsweise von der zweiten Schicht umgeben ist, wobei zumindest eine Ausspareinrichtung vorgesehen ist, welche an dem zumindest einen Vorsprung anliegt, so dass die zweite Schicht zumindest eine Aussparung aufweist, in welche der zumindest eine Vorsprung der ersten Schicht hineinragt;
5. e) Abkühlen des Vorformlings;
6. f) Entformen des Vorformlings.

The object is achieved by a method for producing a preform which comprises at least two layers, the preform being suitable and intended for producing a container which has an outer container and an inner container, the container being suitable for storing a particularly medical or pharmaceutical fluid and is determined, the method comprising the following method steps:

1. a) introducing a mold core into a first mold cavity, so that a first cavity is formed;
2. b) injecting a first plastic into the first cavity, whereby a first layer is formed, wherein the first mold cavity is designed such that the first layer comprises at least one, preferably outwardly protruding, projection;
3. c) introducing the mold core, on which the first layer is advantageously arranged, into a second mold cavity, so that a second cavity is formed;
4. d) Injection of a second plastic into the second cavity, whereby a second layer is formed, wherein the first and second plastic do not enter into a material connection and the first plastic has a higher elasticity than the second plastic, the at least one projection of the first layer is partially surrounded by the second layer, at least one recess device being provided which rests against the at least one projection, so that the second layer has at least one recess into which the at least one projection of the first layer protrudes;
5. e) cooling the preform;
6. f) Demolding the preform.

Accordingly, the method according to the invention is essentially a multi-component injection molding method. However, further process steps that cannot be assigned to an injection molding process would also be conceivable.

The method according to the invention thus only produces preforms by the manufacturer. These preforms can then be transported to the filling company. The respective filling companies can shape the preforms into the individually desired containers.

The injection molding process according to the invention makes it possible in principle to design the preform as desired, but it is advantageous that the actual configuration of the preforms is limited. When designing the preforms, it is only necessary to take into account that the preform is suitable for shaping the container desired by the filling company. Advantageously, factors of the container, such as the desired size, the desired wall thickness, etc., are to be taken into account when designing the preform.

The production, storage, packaging and transport of preforms is therefore much easier than with containers that have already been completely shaped.

The preform is advantageously suitable and intended for storing a medical or pharmaceutical fluid. Such fluids are preferably liquids for application to humans or animals, for example eye drops, nose drops, ear drops or the like. The design of the container according to the invention has particularly great advantages for such fluids. In this way, the inner container or inner bag can be adapted with regard to the requirements of the fluid. Such requirements are, for example, sterility. A certain reaction of the fluid with a certain plastic is also often undesirable. However, the outer container does not have to be manufactured with regard to such conditions. This can be designed on the basis of different conditions, such as stability, feel, appearance, etc.

By storing the fluid in such an inner container, the fluid is particularly protected. Precise dosing is possible, even with fluids with high viscosities, and only a small amount that cannot be used remains in the container. Furthermore, with such dispenser containers, the fluid can be carried out regardless of the orientation of the container. So a 360 ° application is possible. This is particularly advantageous when used with eye drops.

A preferred method of forming the container is a blow molding method or a stretch blow molding method. The preform is advantageously heated in sections and formed into the desired container within a mold by the application of pressure. It can be advantageous if the forming process is integrated into the filling process. The heating necessary for the reshaping can advantageously already ensure the required sterility. A complex additional sterilization of the already produced container would therefore no longer be necessary. Of course, however, further sterilization processes can also take place after the shaping into the container.

The first layer advantageously has a projection and the second layer only has a recess into which the projection protrudes.

According to a preferred embodiment, the preform has an elongated cylindrical or tubular lower section which can be shaped into a bottom section and a central section of the container. This can advantageously be done by a blow molding process or a stretch blow molding process. The preform preferably comprises an upper section which corresponds to an upper section of the container. This upper section is preferably open at the top and rimmed, or includes the mouth of the preform or the container. The upper section advantageously comprises at least one fastening device for fastening a dispensing device. Such a fastening device can be a thread, for example. A fastening device would be conceivable in the form of at least one projection which is arranged on the upper section and protrudes outward in the radial direction. A projection can be provided, which is arranged around the circumference of the upper section. It would also be conceivable that several projections are arranged along the circumference of the upper section. A snap, crimp, bayonet or clip connection of the upper section with the dispensing device can be realized by such a projection or by such projections.

The upper section of the preform is preferably designed in such a way that it corresponds to the upper section of the container. In the deformation process, for example the blow molding process, this upper section is preferably no longer deformed.

According to a further preferred embodiment, the recess is arranged at least in sections in the upper section of the preform. The recess preferably serves as a pressure equalization opening in the container. In a first state of the container, the projection is arranged in the pressure equalization opening or the recess and thus closes it. A first state can, for example, be a state before a first application. The closure of the outer container can prevent foreign substances from entering the outer container through the cutout.

Since there is no material connection between the first layer and the second layer, or the inner container and the outer container, the projection, or a region of the inner container that includes the projection, can be displaced relative to the outer container due to the action of a force. Such a force can take place, for example, by applying pressure to the inner container. Such pressurization results in a compression of the inner container, as a result of which the projection, or a region of the inner container which includes the projection, is correspondingly displaced inward. The force can also be mechanical The action of force or contact by the dispensing device, for example by arranging this on the container, be. After the projection has been moved out of the recess, appropriate ventilation of the space between the inner container and the outer container can be made possible.

According to a further embodiment, the preform comprises more than two layers. The additional layers can advantageously also be configured as coatings. Such coatings can advantageously be produced by means of the injection molding process. However, it would also be conceivable that such coatings are applied using other methods. Such processes can be, for example, spray processes or the like.

The inner surface of the inner container can preferably represent or have a coating. This can be adapted to the fluid stored in the inner container. For example, antibacterial or oxygen-impermeable coatings are conceivable. Such coatings can reduce or even eliminate the use of preservatives. The surfaces of the inner bag can be adapted to properly store medical or pharmaceutical products such as salt water rinses. The surface of the inner container can also be adapted to store essential oils.

According to a further preferred embodiment, the first mold cavity is formed by a first tool die. The second mold cavity is preferably formed by a second tool die. The first and second tool dies preferably consist of at least three parts. A first and a second part of the tool matrices can preferably be displaced in the lateral direction and form a first section of the respective mold cavity. A third part of the tool matrices preferably forms a second or front section of the respective mold cavity. An injection nozzle for the first or the second plastic is preferably provided in the third part of the tool matrices.

Alternatively, of course, the first and the second tool die can consist of one part in which the mold cavity and the injection nozzles are arranged.

In order to enable the projection to be formed, a corresponding recess is advantageously provided in an inner wall of the first tool die. This recess enables an increased application of material, which forms the projection.

According to a further preferred embodiment, the mold core is essentially cylindrical. The mold core is preferably introduced centrally into the first or the second mold cavity. The mold core is preferably arranged on a closing device by means of which the first or the second cavity can be closed. A first distance between a lateral surface of the mold core and an inner wall surface of the first mold cavity preferably defines a wall thickness of the first layer. It is advantageous that a second distance between the first layer, which is preferably arranged on the mold core, and an inner wall of the second mold cavity defines the wall thickness of the second layer.

According to a further preferred embodiment, the first layer and / or the second layer have along a longitudinal direction ( X ) the preform has varying wall thicknesses. The first layer advantageously has a smaller wall thickness in a central region of the lower section than in a lower region of the lower section. A container formed from such an advantageous preform accordingly has a greater wall thickness in the bottom section than in the middle section. If a negative pressure is now applied to the inner container, such a configuration ensures a controlled, fold-bar-like contraction. The more stable bottom area of the inner container is not or only slightly deformed by the negative pressure. The less stable side walls of the central area, on the other hand, deform when the negative pressure is applied. The bottom area pushes up and the inner container contracts like a girder. Such a contraction ensures a very small residual amount of fluid remaining in the inner container.

Furthermore, it would be conceivable to increase or decrease the wall thickness of the side walls in certain areas in order to achieve controlled contraction.

An advantageous variation of the wall thickness of the first layer can be made possible, for example, by varying a diameter of the mold core. The first distance between the outer surface of the mold core and the inner wall surface of the first mold cavity is accordingly varied. An advantageous variation of the wall thickness of the first or second layer can for example also take place by varying the inner wall surface of the first or second mold cavity, so that the first or second distance can be varied.

It has proven to be advantageous that the first cavity of the first layer is designed in such a way that in the upper section of the preform the first layer along the longitudinal direction ( X ) protrudes above the second layer. With such an arrangement, the first layer can advantageously be fixed relative to the second layer by a further device. In a forming process, for example the blow molding process, such a further device is a receiving device which holds the upper section of the preform. In the case of the upper section of the container, which is preferably not deformed by the forming process, the first layer is secured by the dispensing device, which can thus be identified as a further device.

According to a further preferred embodiment, the recess device is a cylindrical pin which is arranged in the second tool die. The recess device is preferably arranged movably in the second tool die. Accordingly, after the mold core, on which the first layer has already been applied, has been introduced into the second tool die, the recess device can be moved towards the projection so that it rests against the projection or encloses it in sections.

The recess device prevents the material from being applied to the projection in sections and thus creating a recess in the second layer in which the projection is arranged.

It would of course be conceivable for the first layer to have several projections and to have several recess devices in the second tool die, so that several recesses in which the corresponding projections are arranged can be provided in the preform

According to a further advantageous embodiment, the first and the second plastic material are each a thermoplastic plastic. The first and the second plastic material are preferably different materials. The first plastic material is preferably Surlyn, LLDPE or LDPE. The second plastic material is advantageously PET or PETG.

The plastic material to be injected is preferably plasticized in a plasticizing unit. Such a plasticizing unit includes, among other things, a plasticizing cylinder with a screw and heating elements. The plasticized plastic material is then preferably supplied to the corresponding cavity via a sprue channel.

According to an advantageous concept of the invention, the first plastic material is injected into the first cavity and / or the second plastic material is injected into the second cavity via a respective hot runner. The sprue system leading from the plasticizing unit to the respective injection nozzle is thereby advantageously thermally insulated from the molding tool. In other sprue systems, the plastic material solidifies in the sprue system. The so-called sprue must then be separated from the molded part. This requires additional tools. Furthermore, the additional plastic material must be disposed of. When using a hot runner, the sprue system is kept at a correspondingly high temperature so that the sprue does not solidify.

In the injection phase, the plasticized respective plastic material is injected into the respective cavity under high pressure via the respective injection nozzle. The pressure is preferably between a value of approx. 1 MPa and approx. 200 MPa. The plasticized plastic material preferably has a temperature between 100 ° C. and 400 ° C. during injection. The elements forming the cavity, however, have a lower temperature, preferably between 80.degree. C. and 120.degree. On contact with the comparatively cold wall areas of the cavity, the plastic solidifies, when the solidification point of the respective material is reached. In order to ensure that the plastic material is distributed as homogeneously as possible in the cavity, the plastic material must be introduced into the cavity quickly. The injection speed is preferably between 5 ccm / s and 40 ccm / s.

After the cavity has been completely filled, the plastic material cools down to a temperature of approx. 80 ° C and 120 ° C. The associated thermal contraction of the material results in volume shrinkage. Due to this volume shrinkage, the corresponding layer is removed from the respective mold cavity and can thus be removed from it.

After the first layer has been removed from the first mold cavity, it remains on the mold core and is transferred into the second mold cavity. For this purpose, a transfer device is advantageously provided on which the mold core or the terminating device is arranged. Such a transfer device can be, for example, a turntable.

After removal from the mold from the second mold cavity, the preform is removed from the mold core. For this purpose, the mold core can advantageously be cooled accordingly. The material of the mold core is preferably selected in such a way that it shrinks accordingly when it cools down, whereby the preform can be demolded from the mold core.

Accordingly, it is advantageous that a corresponding cooling system is provided in the mold core as well as in the first and the second die. Such a cooling system can conduct a cooling medium, for example water, through the mold core and the tool matrices.

Steps e) and f) can preferably also take place simultaneously. It is also conceivable for the preform to be cooled further even after it has been removed from the second mold cavity or from the mold core.

After complete cooling, the preform is fed to an appropriate storage device. After appropriate packaging, the preforms can be fed to the filling company.

The object is also achieved by a preform produced by a method according to one of the preceding embodiments.

The preform can be equipped with all the features already described above in the context of the method individually or in combination with one another and vice versa.

1. a) Bereitstellen eines Vorformlings, hergestellt nach einem der vorhergehenden Ausführungsformen;
2. b) Erhitzen des Vorformlings mittels einer Heizvorrichtung;
3. c) Einbringen des erhitzten Vorformlings in eine Blasform;
4. d) Druckbeaufschlagung des Vorformlings mittels eines Druckmediums, wodurch sich der Vorformling entsprechend der Blasform verformt;
5. e) Abkühlen und Entnehmen des Behältnisses;
6. f) Befüllen des Behältnisses mit einem Fluid;
7. g) Montage einer Ausgabeeinrichtung.

The object is also achieved by a method for producing a container which is suitable and intended for storing a medical and / or pharmaceutical fluid, the container having an inner container and an outer container,

1. a) providing a preform produced according to one of the preceding embodiments;
2. b) heating the preform by means of a heating device;
3. c) placing the heated preform in a blow mold;
4. d) applying pressure to the preform by means of a pressure medium, as a result of which the preform is deformed in accordance with the blow mold;
5. e) cooling and removing the container;
6. f) filling the container with a fluid;
7. g) Assembly of an output device.

The method for producing a container can be equipped with all the features already described above in the context of the method for producing a preform individually or in combination with one another and vice versa.

The preform can preferably be heated by means of a heating oven, an IR radiation device or the like. Since the upper section of the preform should preferably not be deformed, it is advantageous if this section is not or only slightly heated. Furthermore, it can be advantageous that areas of the first and second layers adjoining the upper section are not or only slightly deformed. For this purpose, the heating can be controlled accordingly. A section of the first layer which comprises the at least one projection and a section of the second layer which comprises the recess are advantageously not deformed.

The blow mold preferably comprises a receiving device in which the upper section of the preform is held during the expansion.

The blow mold is usually designed in two parts and represents the negative shape of the container.

Preferably the process is a stretch blow molding process. Accordingly, after the blow mold has been closed around the preform, a stretching rod is inserted from above into the mouth of the preform so that it is mechanically stretched in length.

This is followed by the application of pressure to the preform, as a result of which it is pressed into the blow mold and deformed accordingly.

One or more sterilization processes can preferably be carried out before the fluid is filled.

The object is also achieved by a container produced by a method according to one of the preceding embodiments.

Further advantages, objectives and properties of the present invention are explained with reference to the following description of the attached figures. Components of the same type can have the same reference symbols in the various embodiments.

• 1 Schematische Ansicht der ersten Werkzeugmatrize;
• 2a Schematische Ansicht der zweiten Werkzeugmatrize;
• 2b Schematische Ansicht der zweiten Werkzeugmatrize;
• 3 Schnittansicht des Vorformlings nach einer Ausführungsform;
• 4 Schnittansicht des Behältnisses nach einer Ausführungsform;
• 5 Schnittansicht des Behältnisses nach einer Ausführungsform;
• 6 Schnittansicht des Behältnisses nach einer Ausführungsform;
• 7 Schnittansicht des Behältnisses nach einer Ausführungsform;
• 8 Schnittansicht des Behältnisses nach einer Ausführungsform;
• 9 Schnittansicht des Behältnisses nach einer Ausführungsform;

In the figures show:

• 1 Schematic view of the first tool die;
• 2a Schematic view of the second tool die;
• 2 B Schematic view of the second tool die;
• 3 Sectional view of the preform according to one embodiment;
• 4th Sectional view of the container according to one embodiment;
• 5 Sectional view of the container according to one embodiment;
• 6th Sectional view of the container according to one embodiment;
• 7th Sectional view of the container according to one embodiment;
• 8th Sectional view of the container according to one embodiment;
• 9 Sectional view of the container according to one embodiment;

1. a) Einbringen eines Formkerns 101 in einen ersten Formhohlraum 102, so dass eine erste Kavität 103 gebildet wird;
2. b) Einspritzen eines ersten Kunststoffs in die erste Kavität 103, wodurch eine erste Schicht 2 gebildet wird, wobei der erste Formholraum 102 derart ausgebildet ist, dass die erste Schicht 2 zumindest einen Vorsprung 4 umfasst;
3. c) Einbringen des Formkerns 101 in einen zweiten Formhohlraum 104, so dass eine zweite Kavität 105 gebildet wird;
4. d) Einspritzen eines zweiten Kunststoffs in die zweite Kavität 105, wodurch eine zweite Schicht 3 gebildet wird, wobei der erste und der zweite Kunststoff keine stoffschlüssige Verbindung eingehen und der erste Kunststoff eine höhere Elastizität als der zweite Kunststoff aufweist, wobei der zumindest eine Vorsprung 4 der ersten Schicht 2 abschnittsweise von der zweiten Schicht 3 umgeben ist, wobei zumindest eine Ausspareinrichtung 106 vorgesehen ist, welche an dem zumindest einen Vorsprung 4 anliegt, so dass die zweite Schicht 3 zumindest eine Aussparung 5 aufweist, in welche der zumindest eine Vorsprung 4 der ersten Schicht 2 hineinragt;
5. e) Abkühlen des Vorformlings 1;
6. f) Entformen des Vorformlings 1.

In the 1 , 2a , 2 B a method for producing a preform can be seen 1 which at least two layers 3 , 4th comprises, wherein the preform 1 is suitable and intended for the production of a container 200 , which is an outer container 201 and an inner container 202 having, the container 200 is suitable and intended for the storage of a particularly medical or pharmaceutical fluid, the method comprising the following method steps:

1. a) Introducing a mold core 101 into a first mold cavity 102 so that a first cavity 103 is formed;
2. b) Injection of a first plastic into the first cavity 103 , creating a first layer 2 is formed, the first mold cavity 102 is designed such that the first layer 2 at least a head start 4th includes;
3. c) Introducing the mold core 101 into a second mold cavity 104 so that a second cavity 105 is formed;
4. d) Injection of a second plastic into the second cavity 105 , creating a second layer 3 is formed, wherein the first and the second plastic do not enter into a material connection and the first plastic has a higher elasticity than the second plastic, the at least one projection 4th the first layer 2 in sections from the second layer 3 is surrounded, with at least one recess device 106 is provided which on the at least one projection 4th rests so that the second layer 3 at least one recess 5 has, in which the at least one projection 4th the first layer 2 protrudes;
5. e) cooling the preform 1 ;
6. f) Demolding the preform 1 .

In the 1 , 2a and 2 B is also a corresponding injection molding tool 100 recognizable which a first tool die ( 107 ) and a second tool die ( 108 ) includes. The first mold cavity ( 102 ) is supported by a first tool die ( 107 ) and the second mold cavity ( 104 ) by a second ( 108 ).

The tool matrices 107 , 108 each consist of at least three parts 107a , 107b , 107c , 108a , 108b , 108c . A first 107a , 108a and a second part 107b , 108b of the tool matrices 107 , 108 are displaceable in the lateral direction Y '. This is also indicated by the arrows 117 in the 1 , 2a and 2 B evident. The first 107a , 108a and the second part 107b , 108b each form a first section 102a , 104a of the respective mold cavity 102 , 104 . The third part 107c , 108c of the tool matrices 107 , 108 forms a second section 102b , 104b of the respective mold cavity ( 102 , 104 ) from which along the lengthwise direction X ' seen below the first section 102a , 104a connects.

The third part 107c the first tool die 107 includes an injector 109 for the first plastic. The third part 108c the second tool die 108 includes an injector 110 for the second plastic.

The mold core 101 is a male tool and is essentially cylindrical and extends along the longitudinal direction X ' . This is where the mold core 101 centrically in the first or second mold cavity 102 , 104 brought in. The mold core 101 is at a graduation facility 111 arranged. The final facility 111 has a protruding area which extends in the lateral direction Y 'over the mold core 101 protrudes. The protruding area is dimensioned in such a way that it forms the respective cavity 103 , 105 of the tool matrices 107 , 108 covers and completes when the mandrel 101 in the mold cavities 102 , 104 is arranged. The final facility 111 in such a closed state lies on tool matrices 107 , 108 on.

The mold core 101 has a lateral surface 113 . This jacket surface 113 can be parallel to the longitudinal direction X ' extend. Furthermore, the mold core 101 a diameter 118 on. That diameter 118 can remain constant along the longitudinal direction. This creates a constant first distance 112 between the lateral surface 113 of the mold core 101 and an inner wall surface 114 of the first mold cavity ( 102 ) Are defined. This first distance 112 defines a wall thickness 9 the first layer 2 . It would also be conceivable that the diameter 118 along the longitudinal direction X ' varies. This allows a varying wall thickness 9 the first layer 2 along the longitudinal direction X of the preform 1 will be realized. A second distance 115 between the first layer 2 and an inner wall 116 of the second mold cavity 104 then defines the wall thickness 10 the second layer 3 .

The first mold cavity 102 has at least one enlarged region 102c, or a recess, in which increased material deposition is possible, so that the projection 4th can be formed.

After injecting the first plastic, the first layer is created 2 from the first mold cavity 102 demolded, preferably along the demolding direction 119 . The mold core 101 is introduced with the first layer into the second mold cavity. A transfer device can be provided for this purpose (not shown in the figures).

The second tool die 108 has a recess device 106 in the form of a cylindrical pin. After inserting the mold core 101 with the first layer 2 into the second mold cavity 104 is the recess device 106 , or the pin on the projection 4th on. For this purpose, the pin can be immovable in the second tool die 108 be arranged. The concern is made by a closing movement of the first 108a and second part 108b against the direction of the arrow 117 . The pin can also be mounted on the tool die by means of a spring mounting 108 be arranged. This results in a gentle abutment against the projection 4th guaranteed. It would also be conceivable that the recess device 106 , or the pin by means of an actuator after the first layer has been applied 2 into the second mold cavity 104 to the ledge 4th is relocated. The actuator can be an electric actuator, a hydraulic actuator or another actuator driven.

By the concern of the recess device 106 the second plastic is prevented from completely enclosing the projection. It becomes only a partial inclusion of the protrusion 4th desirable to the functionality of the protrusion 4th as an openable closure of the pressure equalization opening 206 to guarantee.

The recess device 106 is in the 2a shown. In 2 B is the recess device 106 covered.

After injecting the second plastic, the preform becomes 1 cooled and out of the second mold cavity 104 demolded, preferably along the demolding direction 119 . The cooling of the preform 1 can be done by a cooling system which is integrated in the mold core. The cooling can take place cumulatively or alternatively by contacting the preform with a cold gas. Furthermore, the preform 1 from the mandrel 101 demoulded and fed to further processes such as the packaging process. The demolding can be done by a gripper arm or similar mechanical devices.

The preform is in the 3 shown. The preform 1 has an elongated cylindrical lower portion 6th on which to a to a floor section 208 and a middle section 209 of the container 200 is malleable. The corresponding container 200 is in the 4th and 5 shown. The preform also includes 1 an upper section 7th , which is an upper section 203 of the container 200 corresponds to. The upper section 7th , 203 is also designed to be circular-cylindrical. In the forming process, the upper section is preferably used 7th of the preform is not deformed. The upper section 7th , 203 comprises at least one fastening device 8th , 204 for attaching a dispensing device 205 . In the figures, the fastening device is in the form of a radial direction R. extending projection configured. However, the invention is not restricted to such an embodiment.

The recess 5 is in the upper section 7th of the preform 1 arranged. This recess 5 serves as a pressure equalization opening 206 in the container 200 .

It would be conceivable that the first layer 2 and / or the second layer 3 of the preform 1 along a longitudinal direction X of the preform 1 varying wall thicknesses 9 , 10 exhibit. This could be the first layer 2 in a middle area 6a of the lower section 6th a smaller wall thickness 9 than in a lower range 6b of the lower section 6th . This could result in the from the preform 1 shaped container 200 a constriction-like contraction can be realized when the pressure is applied accordingly.

In the 5 to 9 are embodiments of the container 200 shown. The container 200 has an outer container 201 and an inner container 202 in which the fluid is received. Furthermore, the container has an upper section 203 , a floor section 208 and a central section 209 on.

Basically, the shape of the container 200 can be designed in any way and adapted to the respective requirements. The base of the container 200 forming hollow body can for example be circular, elliptical, square, rectangular or a polygon. Likewise, the side walls of the central section 209 can be designed as desired. For example, a straight, waisted or bulbous shape of the side walls would be conceivable.

Between the middle section 209 and the top section 103 is a transition section 211 intended. In this transition section 211 the diameter of the container increases along the longitudinal direction X , so from the upper section 203 towards the middle section 209 . The preform also has accordingly 1 a transition section 12th between the top section 7th and the lower section 6th on.

The upper section 203 is cylindrical and surrounds the mouth of the container 200 . In the 4th and 5 has the upper section 203 a flange-like fastening device 204 on. Along the longitudinal direction X below the fastening device 204 is another all-round lead 210 arranged. This head start 210 can be used as a support surface for the dispensing device 205 serve. Along the longitudinal direction X is between the flange-like formed fastening device 204 and the lead 210 the pressure equalization opening 206 arranged. The container 200 is shown in a first state in which the projection 207 in the pressure equalization opening 206 is arranged and thus closes it. The projection 2017 is oriented essentially outwardly along the radial direction. A lateral outer surface of the projection 2017 ends flush with an outer surface of the outer container.

The first layer 2 of the preform 1 as well as the inner container 202 of the container 200 have a protruding section 11 on, which is opposite to the longitudinal direction X over the second layer 3 , or the outer container protrudes. This overhang section 11 can be used to fix the first layer 2 , or the inner container are used.

In the embodiments according to 6th to 9 the overhang section is used 11 for transferring to the second activated state of the container 200 . The overhang section 11 is at its upper end with a flange 213 designed. The flange 213 occurs when arranging the dispensing device 205 with a contact surface of the dispensing device 205a in contact. This is when arranging the dispensing device 205 the transition area 211 along the longitudinal direction X moved down. This in turn creates an area 214 of the inner container 202 , which the lead 207 includes and thus the projection 207 along the longitudinal direction X shifted downwards. In this activated state, an inwardly protruding flange engages around 215 the delivery facility 205 the fastening device 204 , whereby the dispenser 2015 on the container 200 is fixed. According to this embodiment, too, it is advantageous that the region which the projection 207 and an area which includes the pressure compensation opening 206 were not deformed in the blow molding process.

According to these embodiments, the pressure equalization opening 206 , or recess 5 in the preform 1 section by section in the upper section 7th , 203 and in sections in the transition section 12th , 211 arranged. The lead 207 is accordingly designed to be essentially conical. A first boundary edge 216 the pressure equalization opening 206 , or recess 5 runs essentially parallel to the longitudinal direction X . A second boundary line 216 the pressure equalization opening 206 , or recess 5 runs at an angle oblique to that parallel to the longitudinal direction X . The area 214 of the inner container 202 comprehensive the lead 207 can be substantially undulating along the longitudinal direction X bulge down. Thus, the inner container comes loose 202 in the adjoining middle section 209 not from the outer container 201 .

The delivery facility 205 covers the pressure compensation opening 206 partially. This prevents foreign bodies or dirt from entering the outer container 201 can enter. The pressure equalization can be achieved through adequate ventilation between the dispensing device 205 and the outer container 202 respectively. This is indicated by arrows in the 9 shown.

All features disclosed in the application documents are claimed as essential to the invention, provided that they are new to the state of the art, individually or in combination.

List of reference symbols

1

Preform

2

first layer

3

second layer

4th

head Start

5

Recess

6th

lower section

6a

middle area of the lower section

6b

lower part of the lower section

7th

upper section

8th

Fastening device

9

Wall thickness of the first layer

10

Wall thickness of the second layer

11

Overhang section

12th

Transition section

100

Injection molding device

101

Mold core

102

first mold cavity

102a

first portion of the first mold cavity

102b

second portion of the first mold cavity

103

first cavity

104

second mold cavity

104a

first portion of the second mold cavity

104b

second portion of the second mold cavity

105

second cavity

106

Recess device

107

first tool die

107a

first part of the first tool die

107b

second part of the first tool die

107c

third part of the first tool die

108

second tool die

108a

first part of the second tool die

108b

second part of the second tool die

108c

third part of the second tool die

109

Injection nozzle for the first plastic

110

Injection nozzle for second plastic

111

Closing facility

112

distance

113

Lateral surface of the mold core

114

Inner wall surface of the first mold cavity

115

second distance

116

Inner wall of the second mold cavity

117

Arrows

118

Diameter of the mandrel

119

Demolding direction

200

container

201

Outer container

202

Inner container

203

upper section

204

Fastening device

205

Dispensing device

205a

Contact surface of the delivery device

206

Pressure equalization opening

207

head Start

208

Floor section

209

Middle section

210

head Start

211

Transition section

212

Overhang section

213

flange

214

Area of the inner container including the projection

215

inwardly protruding flange of the dispensing device

216

first boundary edge

217

second boundary edge

X

Longitudinal direction of the preform and the container

R.

radial direction of the preform and the container

X '

Longitudinal direction of the injection molding tool

Y '

lateral direction of the injection molding tool

Claims (10)

Method for producing a preform (1) which comprises at least two layers (3, 4), the preform (1) being suitable and intended for producing a container (200) which has an outer container (201) and an inner container (202) wherein the container (200) is suitable and intended for storing a particularly medical or pharmaceutical fluid, the method comprising the following method steps: a) introducing a mold core (101) into a first mold cavity (102), so that a first cavity (103) is formed; b) injecting a first plastic into the first cavity (103), whereby a first layer (2) is formed, the first mold cavity (102) being designed in such a way that the first layer (2) comprises at least one projection (4); c) introducing the mold core (101) into a second mold cavity (104) so that a second cavity (105) is formed; d) Injection of a second plastic into the second cavity (105), whereby a second layer (3) is formed, wherein the first and the second plastic do not enter into a cohesive connection and the first plastic has a higher elasticity than the second plastic, wherein the at least one projection (4) of the first layer (2) is partially surrounded by the second layer (3) is, wherein at least one recess device (106) is provided which rests against the at least one projection (4) so that the second layer (3) has at least one recess (5) into which the at least one projection (4) of the first Layer (2) protrudes; e) cooling the preform (1); f) Demolding the preform (1). Procedure according to Claim 1 characterized in that the preform (1) has an elongated cylindrical lower section (6) which can be shaped into a bottom section (208) and a central section (209) of the container (200), the preform (1) having an upper one Section (7) which corresponds to an upper section (203) of the container (200), wherein the upper section (7, 203) comprises at least one fastening device (8, 204) for fastening a dispensing device (205). Procedure according to Claim 2 characterized in that the recess (5) is arranged at least in sections in the upper section (7) of the preform (1), the recess (5) serving as a pressure compensation opening (206) in the container (200), in a first state of the container (200), the projection (207) is arranged in the pressure compensation opening (206) and thus closes it. Method according to one of the preceding claims, characterized in that the first mold cavity (102) is formed by a first tool die (107), the second mold cavity (104) being formed by a second tool die (108), the first (107) and the second tool die (108) consist of at least three parts (107a, 107b, 107c, 108a, 108b, 108c), a first (107a, 108a) and a second part (107b, 108b) of the tool dies (107, 108) in are displaceable in the lateral direction and form a first section (102a, 104a) of the respective mold cavity (102, 104), a third part (107c, 108c) of the tool matrices (107, 108) forming a second section (102b, 104b) of the respective mold cavity (102, 104), an injection nozzle (109, 110) being provided for the first and the second plastic in the third part (107c, 108c) of the tool matrices (107, 108). Method according to one of the preceding claims, characterized in that the mold core (101) is essentially cylindrical and is introduced centrally into the first or second mold cavity (102, 104), the mold core (101) being arranged on a terminating device (111) , by means of which the first (103) and the second cavity (105) can be closed, wherein a first distance (112) between a lateral surface (113) of the mold core (101) and an inner wall surface (114) of the first mold cavity (102) defines a wall thickness (9) of the first layer (2), a second distance (115) between the first layer (2) and an inner wall (116) of the second mold cavity (104) defining the wall thickness (10) of the second layer (3) Are defined. Method according to one of the preceding claims, characterized in that the first layer (2) and / or the second layer (3) have wall thicknesses (9, 10) that vary along a longitudinal direction (X) of the preform (1), the first layer ( 2) has a smaller wall thickness (9) in a central area (6a) of the lower section (6) than in a lower area (6b) of the lower section (6). Method according to one of the preceding claims, characterized in that the recess device (106) is a cylindrical pin which is arranged in the second tool die (108), the recess device (106) being movably arranged in the second tool die (108). The method according to any one of the preceding claims, characterized in that the first and the second plastic material are each a thermoplastic plastic, the first and the second plastic material are different materials, the first plastic material is Surlyn, LLDPE or LDPE, the second plastic material PET or PETG, the first plastic material being injected into the first cavity (103) and / or the second plastic material being injected into the second cavity (105) via a respective hot runner. Preform produced by a method according to one of the preceding claims. A method for producing a container (200) which is suitable and intended for storing a medical and / or pharmaceutical fluid, the container (200) having an inner container (201) and an outer container (202), a) providing a preform (1 ) manufactured according to one of the preceding Claims 1 to 8th ; b) heating the preform (1) by means of a heating device; c) introducing the heated preform (1) into a blow mold; d) applying pressure to the preform (1) by means of a pressure medium, whereby the preform (1) is deformed in accordance with the blow mold; e) cooling and removing the container (200); f) filling the container (200) with a fluid; g) assembly of an output device (205).

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