Device for co-extruding a multi-layer co-extrusion composite, system for producing a multi-layer co-extrusion composite having such a device, and method for operating such a device

Abstract

A device (10) is known for co-extruding a multi-layer co-extrusion composite (100), in particular a co-extruded multi-layer film, comprising a main channel (20) for producing a main layer (22) of the co-extrusion composite (100), at least one co-extrusion channel (30, 30', 40, 40') for producing at least one co-extrusion layer (32, 32', 42, 42') of the co-extrusion composite, said co-extrusion layer being connected to the main layer (22), and a plurality of actuatable setting elements (24, 24', 34, 34') for setting layer thicknesses or layer thickness profiles of the layers of the co-extrusion composite (100). According to the invention, the device (10) has at least one adjusting device (200) for actuating the setting elements (24, 24', 34, 34'), wherein the at least one adjusting device (200) can be moved in order to be positioned at the setting elements (24, 24', 34, 34') such that an actuating device (70) of the adjusting device (200) can be brought into operative connection with a respective setting element (24, 24', 34, 34') for actuating the respective setting element (24, 24', 34, 34').

Description

[0001] Reifenhäuser GmbH & Co. KG September 16, 2024 Machine Factory M / RFH-110-PC FM / CG / cg

[0002] Device for co-extruding a multi-layer co-extrusion composite, system for producing a multi-layer co-extrusion composite with such a device and method for operating such a device

[0003] The invention relates to a device for co-extruding a multi-layer co-extrusion composite, in particular a co-extruded multi-layer film, a system for producing a multi-layer co-extrusion composite and a method for co-extruding a multi-layer co-extrusion composite.

[0004] It is known from the prior art to manipulate cross-sections of material melt channels by manually driven adjusting elements when co-extruding a multi-layer co-extrusion composite in order to be able to produce different single-layer thicknesses or single-layer profiles on individual layers of the multi-layer co-extrusion composite.

[0005] The co-extrusion of a multilayer co-extruded composite is typically achieved using a device also known as a co-extrusion adapter, feedblock, or co-extrusion block. This device is a key component in the co-extrusion process used in the plastics processing industry. It plays a crucial role in the production of multilayer films or coatings, where different plastic materials are combined into a single multilayer structure. The device allows material melts from usually different extruders to be merged into a single strand of material. This strand is then fed through an extrusion die to produce the desired multilayer film or coating.

[0006] The device typically has channels or melt flow paths where the various material streams come into contact with each other. These channels usually contain adjustment elements, also called profilers, which allow the material flows to be controlled and the MEISSNER BOLTE M / RFH-110-PC

[0007] 2

[0008] The layer thickness and the layer thickness profile in the resulting multilayer structure can be influenced.

[0009] The device is therefore a common instrument for the production of multilayer plastic products and enables the targeted control of the layer properties, which is of great importance in various industries, including packaging, construction and the automotive industry.

[0010] In such a device, the described adjustment elements are typically provided for each layer to precisely control the layer thickness and layer thickness profile. These adjustment elements for each layer are typically arranged side by side in a row, along the channel or melt flow path corresponding to each layer.

[0011] The adjustment elements are typically operated from the outside to ensure easy and accessible control. A common method for actuating these elements is by means of screws, which engage in corresponding threaded holes on the adjustment elements. The adjustment elements are usually found on both sides of the device.

[0012] For example, EP 1 621 320 A1 discloses a device for an extrusion plant which is characterized by a central channel and several co-extrusion channels, wherein a plurality of actuating elements are provided in the device which can be controlled from the outside by means of manually actuated adjusting elements in such a way that a cross-sectional manipulation of channels of the device can be achieved with these actuating elements.

[0013] Furthermore, DE 42 03 755 A1 discloses a method for controlling the individual layer thicknesses of several layers of a multilayer plastic film produced by coextrusion. In this method, individual melt streams guided through channels within a device of a coextrusion tool are combined to form a strand of individual layers, and the respective total layer thickness of the individual layers is determined before exiting a die section of the coextrusion tool MEISSNER BOLTE M / RFH-110-PC.

[0014] 3. Furthermore, in this procedure, the determined measurement data is compared with target value specifications, whereby the result, in case of deviation of the target-actual value comparison, is used to change a total channel cross-section of one of the channels for the individual melt flows to generate the layers.

[0015] A disadvantage of the current state of the art is, in particular, the insufficient and often lengthy adjustment options for a layer thickness or layer thickness profile on individual layers of a multi-layer coextrusion composite during extrusion of the multi-layer coextrusion composite, especially due to temperatures prevailing directly at such a device.

[0016] The invention is based on the objective of further developing the prior art of producing multilayer films and simplifying the setting of layer thicknesses and / or layer thickness profiles.

[0017] This task is solved by the subject matter of the independent claims.

[0018] According to a first aspect of the invention, the present problem is solved in particular by a device for co-extruding a multilayer co-extruded composite, especially a co-extruded multilayer film. Such a device comprises a main channel for producing a main layer of the co-extruded composite, and at least one co-extrusion channel for producing at least one co-extruded layer of the co-extruded composite connected to the main layer. For adjusting the respective layer thicknesses and / or layer thickness profiles of the layers of the co-extruded composite, the device comprises a plurality of actuable adjusting elements.The device comprises at least one adjusting device for actuating the adjusting elements, wherein the at least one adjusting device is movable in such a way as to be positioned on the adjusting elements so that an actuating device of the adjusting device can be brought into operative contact with each adjusting element for actuating the respective adjusting element. It is therefore proposed that the device comprises a movable adjusting device which can be brought into contact with each of the adjusting elements to actuate the plurality of adjusting elements. MEISSNER BOLTE M / RFH-110-PC.

[0019] 4

[0020] The ability to precisely position the actuating device enables efficient and accurate adjustment of the setting elements without requiring time-consuming interventions or a multitude of complex mechanisms. This can lead to an increase in the overall efficiency of such a device and to an optimization of production costs.

[0021] This device is typically preceded by an extruder unit for supplying melts of thermoplastic materials for the respective layers.

[0022] The term "layer thickness" here describes a layer thickness that is constant when viewed across its entire width, i.e., perpendicular to its longitudinal extent in the machine direction. A constant layer thickness is defined as a layer thickness that does not deviate by more than 20% from the mean layer thickness. This deviation from the mean layer thickness is particularly relevant for thin layers with a thickness in the range of 1 pm. For thicker layers with a thickness in the range of 10 pm to 800 pm, preferably in the range of 10 pm to 400 pm, and more preferably in the range of 10 pm to 200 pm, a constant layer thickness is defined as a layer thickness that does not deviate by more than 10%, preferably not more than 8%, and more preferably not more than 5% from the mean layer thickness.In contrast, the term "layer thickness profile" describes a profiled layer thickness or layer thickness profile when viewed across its entire width, i.e., perpendicular to its longitudinal extent in the machine direction. This is achieved in particular by a large number of adjustment elements per coextrusion channel, which are arranged side by side across the channel width and are preferably individually operable.

[0023] As previously described, the device can also be referred to as a "co-extrusion adapter." This is typically a component in which different material melts from various extruders are combined as a multi-layered strand, which is then fed to a die section or extrusion die. Within the device MEISSNER BOLTE M / RFH-110-PC

[0024] 5. Preferably in adapter areas where the individual material melts merge, an overall profile of profiled individual layers can be created by adjusting or changing one or more melt channel profiles.

[0025] After passing through the nozzle part or extrusion nozzle and exiting an extrusion nozzle gap, a multi-layer co-extrusion composite is usually present with a desired overall and individual layer distribution.

[0026] The described device is often also referred to as a "feedblock".

[0027] The term “main channel” here refers to a channel arranged within the device for producing the first, often middle, layer of a multi-layer co-extrusion composite.

[0028] In contrast, the term "coextrusion channel" refers to a secondary channel within the device for producing a further layer of a multilayer coextrusion composite, which is arranged next to the main layer.

[0029] The term "adjusting elements" here describes any devices by means of which the cross-sectional areas of material-carrying channels (main channel and / or co-extrusion channels) of a device can be manipulated.

[0030] The adjustment elements are typically located within the device and at least partially within a channel of the device. For example, such an adjustment element can be designed as a sliding element that can be inserted transversely into a material-carrying channel. Alternatively, such an adjustment element can be pivotably arranged around a rotational axis within a material-carrying channel. In particular, the presence of multiple adjustment elements assigned to a channel allows for highly individualized control of the channel cross-sections of a channel within a co-extrusion process, whether with regard to the width and / or height of the respective channel. This also enables the production of profiled individual layers. MEISSNER BOLTE M / RFH-110-PC

[0031] 6 can be generated. In this respect, such adjusting elements are often also referred to as "profilers". For example, several adjusting elements or profilers can be arranged across the entire width of a channel in the device; for example, 3 to 10 or more such adjusting elements can be provided, thereby enabling the production of individually profiled individual layers in the coextrusion composite.

[0032] The term "adjustment device" describes, in this context, devices by means of which an adjustment element arranged within the device can be actuated from outside the device. For this purpose, the adjustment device is movable in such a way as to be positioned on the adjustment elements. The adjustment device further comprises an actuating device that can be brought into operative contact with the adjustment elements.

[0033] In this way, the actuating device can be brought into operative contact with an adjustment element to actuate it. In some embodiments, the adjustment device is designed such that the actuating device can be moved close enough to the desired adjustment elements for actuation. This enables precise adjustment of the adjustment elements depending on the requirements of the production process.

[0034] The proposed adjustment device offers a means of actuating a multitude of adjustment elements with only one actuating device. In devices for extruding a multilayer coextruded composite, where the multitude of actuable adjustment elements for setting the layer thicknesses or layer thickness profiles of the layers of the coextruded composite are distributed on two sides of the device, it is preferred that an adjustment device for actuating the adjustment elements be provided on each side with such adjustment elements. It is preferred that, in this design, the respective adjustment devices are movable in such a way as to be positioned on the respective adjustment elements of their assigned side, so that the actuating device of each adjustment device can be brought into operative contact with each adjustment element for actuation. MEISSNER BOLTE M / RFH-110-PC

[0035] 7

[0036] Unlike known devices where the adjustment elements are manually operated, or where each adjustment element has its own individual actuator, the proposed solution allows the use of a single actuator that can be positioned as needed at the various adjustment elements. This streamlines and simplifies the entire actuation process, resulting in increased efficiency and ease of use. A further advantage of the proposed adjustment device is the reduction in the number of maintenance parts. By using a single actuator instead of many separate ones, maintenance effort and costs can be significantly reduced.Fewer parts mean fewer potential sources of failure and reduced maintenance requirements, which increases the system's uptime and lowers overall operating costs. Calibrating the actuator is also significantly simpler with only a single actuator. Deviations that could occur between multiple actuators are therefore eliminated.

[0037] The adjustment elements used in this device offer a flexible solution for controlling layer thicknesses and profiles in multilayer coextrusion composite production. In the simplest case, these adjustment elements can be screw-operated, with the screws engaging, for example, in corresponding threaded holes on the adjustment elements, allowing for easy handling and precise adjustment. Alternatively, these adjustment elements could also be designed with pneumatic control valves or pistons to enable precise and rapid regulation of material flows between individual layers. This versatility in the actuation of the adjustment elements allows the device to be adapted to the specific requirements of the production process.

[0038] The actuating mechanism of the adjustment device can be electrically, hydraulically, or pneumatically operated, for example. It can be equipped with a torque sensor and / or other measuring device to monitor the actuation process. This allows, for example, the maximum possible positions of the adjustment elements to be recorded, thus preventing damage during operation. This simplicity facilitates the MEISSNER BOLTE M / RFH-110-PC

[0039] 8

[0040] Handling and maintenance of the system are significantly improved and contribute to reducing errors in the production process.

[0041] The ability to connect the actuating device to the respective adjustment element is a key advantage of the adjustment mechanism. The ability to precisely move the adjustment elements for actuation contributes to the quality and consistency of the produced films and minimizes rejects and waste.

[0042] The ability to connect the actuating device to the respective adjustment element in a predefined sequence is an additional advantage of the proposed device. This enables targeted control of pressure changes within the device. For example, the adjustment elements can be actuated first at the edges to prevent unwanted turbulence in different layers. This allows layer thicknesses or layer thickness profiles to be set with exceptional precision and dynamism. This precise process control leads to improved quality of the multilayer films and contributes to production efficiency.

[0043] Preferably, the device comprises a measuring device for measuring layer thicknesses and / or layer thickness profiles, in particular for measuring the layer thicknesses and / or layer thickness profiles of the respective individual layers of the multilayer coextruded composite. Preferably, such a measuring device is configured to measure the layer thicknesses and / or layer thickness profiles after extrusion of the multilayer film, i.e., downstream of a die section. It has been recognized that it is advantageous, in particular, to measure the layer thicknesses or layer thickness profiles of an extruded multilayer coextruded composite.The measurement of a coextruded multilayer film is performed downstream of a die section of the device, as the layer material there has already cooled significantly compared to the still more plasticized layer melt located in the die section. Therefore, the measurement data obtained is not, or only negligibly, distorted by shrinkage or similar factors. The part of the device located upstream of the die is generally also referred to as the coextrusion die. Preferably, the measuring device is coupled with a system controller for controlling the system. MEISSNER BOLTE M / RFH-110-PC is particularly preferred.

[0044] 9. The relative positions of adjustment elements are automatically, preferably iteratively, manipulated by the adjustment device using the system control system, depending on measured layer thicknesses and / or layer thickness profiles. Preferably, the adjustment elements can be precisely set depending on the determined measurement data, so that layer thicknesses or layer thickness profiles can be generated more accurately. In particular, this allows for an advantageous inline comparison between the adjustment elements and the measurement data. This can lead to the present device being operated very effectively and precisely.

[0045] The present device can also be operated very efficiently if the actuation positions of the adjusting elements can be automatically determined by stored recipes for the respective layers of a multi-layer co-extrusion composite. In particular, it is possible to manipulate an extruder unit of the device using a control unit based on available measurement data, preferably measurement data acquired downstream of a die section, and / or depending on the recipes.

[0046] A further strength of the proposed adjustment device lies in its versatility when used with different displacement systems. Typically, devices for co-extruding a multi-layer co-extruded composite have a multitude of adjustment elements arranged in several stacked rows. The adjustment device is preferably designed such that the actuating device can be positioned precisely above each of the adjustment elements. In the case of adjustment elements positioned on multiple sides of the device, it is correspondingly preferred that such an adjustment device be provided on each side with adjustment elements. With this design, the actuating device can preferably be positioned in front of each adjustment element on a given side of the device.

[0047] In various embodiments, the device includes adjusting elements arranged on two sides of the device, enabling the production of multiple coextruded layers of the coextruded composite connected to the main layer. It is also possible to produce at least one further coextruded layer of the coextruded composite connected to the main layer. Such configurations allow for the production of MEISSNER BOLTE M / RFH-110-PC

[0048] 10. In addition to two-layer coextrusion composites, also produce coextrusion composites that have 3 to 9 layers or more layers.

[0049] The adjustment device offers significant advantages that enable a substantial improvement in the entire production process. One of the main advantages lies in the considerable reduction in setup effort and costs, as the adjustment device preferably requires only one actuating device to operate a large number of adjustment elements. It should be noted that in the device described above, with adjustment elements arranged on two sides, there are preferably also two actuating devices. These are arranged such that one actuating element is located on each side, so that preferably all adjustment elements can be operated by a single actuating device.

[0050] In one embodiment of the device, the adjustment mechanism is displaceable in height and width. Preferably, guide elements are provided along which the adjustment mechanism can be displaced. This height and width can also be considered the X and Y axes along which the adjustment mechanism can be displaced. One possible approach to displacing the adjustment mechanism is to provide driven spindles for each direction to adjust the height and width of the device. If actuation of one of the adjustment elements is required, the actuating device is positioned accordingly along a Z-axis in this design.The actuating device can, for example, first be moved to the desired position relative to the X and Y axes and can then be brought into operative contact with the respective adjusting element by moving it along the Z axis.

[0051] Preferably, the adjustability of the mechanism allows the actuating device to be precisely aligned with each individual adjustment element and then brought into the required operative connection to perform the desired actions on the respective adjustment element. MEISSNER BOLTE M / RFH-110-PC

[0052] 11

[0053] The precise three-dimensional control of the adjustment unit along the X, Y and Z axes allows the actuating device to be positioned in a targeted manner for actuation at the adjustment elements in order to adjust the layer thickness and / or the layer thickness profile in the multi-layer co-extrusion composite.

[0054] The adjustment mechanism can be positioned on the device for co-extruding the multilayer co-extruded composite in such a way as to thermally decouple the adjustment mechanism from the device. This design enables more reliable and stable functionality of the actuating device, even under extreme operating conditions. The plastic melts processed on the device can typically reach temperatures of up to 280 degrees Celsius or even higher. To effectively insulate the actuating device from this heat and protect it from damage, the guide elements of the adjustment mechanism could, for example, be designed to create an appropriate distance from the device to minimize heat transfer and ensure safe handling of the adjustment mechanism. The distance between the device and the adjustment mechanism is preferably greater than 4 cm.This thermal decoupling therefore contributes significantly to the longevity and reliability of the entire system.

[0055] In one embodiment, the actuating device for establishing the operative connection is movable between an actuating position and a rest position by means of a pneumatic adjustment. This method enables a quick and reliable connection and disconnection with the adjusting elements, which increases the overall efficiency of the device. In the

[0056] In the resting position, the operating device is positioned such that the

[0057] The adjustment device can be moved without the actuating device coming into unwanted contact with the fixture. In addition to the positions mentioned above, there may be other positions, for example, to...

[0058] To bring the actuating device into a service position in which it can be replaced and / or serviced.

[0059] In one embodiment, the adjusting elements are self-locking. This means that they lock into place under operating pressure in the MEISSNER BOLTE M / RFH-110-PC device.

[0060] 12. Do not adjust without actuation. This ensures that the device settings remain stable and do not change unintentionally, even under high pressures or loads. The self-locking properties of the adjustment elements help maintain the integrity and precise functionality of the device during operation, thus increasing the system's reliability.

[0061] In one embodiment, the adjustment elements are mounted such that they remain in their respective axial positions when each adjustment element is actuated. This means that the adjustment elements maintain a fixed position, independent of the actuation of other elements. This design ensures that the adjustment elements remain precisely and consistently operable. A significant advantage of this design is that the actuating device can always move to a predefined Z-position without having to consider the current position of the adjustment elements. This simplifies the control and handling of the actuating device, as no complicated calculations or corrections are necessary to achieve the desired Z-position. This functionality facilitates precise control for the operators.

[0062] In one embodiment, each of the adjustment elements is assigned a test element that provides information about the respective actuation position of the associated adjustment element. This arrangement makes it possible to monitor and verify the current status and position of each adjustment element without having to measure the coextruded multilayer coextrusion composite.

[0063] This test element can be, for example, a measuring pin. This measuring pin can be marked to determine how far an adjustment element protrudes into its corresponding channel, or what the channel cross-section is ultimately set to. The markings can be designed so that they can be read by an operator. Alternatively, the markings can be machine-readable, allowing them to be detected automatically. This measuring pin can, for example, be attached to the adjustment elements so that it is visible and / or measurable from the outside, depending on the MEISSNER BOLTE M / RFH-110-PC.

[0064] 13

[0065] Adjustment position of the adjusting elements protruding from the device. Alternatively, instead of a measuring pin, the existing channel cross-section can also be measured by the distance of an index bolt relative to a reference plane or surface. Additional measuring tools or instruments may be used as needed.

[0066] The test elements are primarily used to detect the movements and positions of the adjustment elements and to provide feedback on their precise location. This feedback can be monitored in real time to ensure that the adjustment elements are functioning correctly and are in their intended positions. This enables precise control and adjustment of the settings. The availability of feedback on the actuation positions of the adjustment elements facilitates the monitoring, maintenance, and / or control of the system, as deviations or malfunctions can be detected and corrected early.

[0067] In one embodiment, the device has a test unit configured to determine the respective actuation position of an adjustment element by detecting a deviation from a reference position. The reference position can be, for example, a maximum and / or minimum stop of the adjustment element, i.e., a respective end position. To determine the actuation position, the degree of previous actuations and / or the known thread pitch can be used. These values ​​are preferably stored in control software, allowing the profiler setting to be reproduced at a later time. The test unit can, for example, be a device configured to assign a test element to a respective adjustment element.Preferably, the testing unit is a computing device that performs the function of detecting and / or monitoring the respective positions of the adjustment elements by means of a detectable deviation from a reference position. Particularly preferably, the function of the testing unit is implemented as software.

[0068] For verification purposes, one of the maxima can be approached at any time to determine and / or confirm the reference position. In conjunction with preferred torque measurement, automatic detection and verification of the reference position is possible. Alternatively, it can also be set manually. MEISSNER BOLTE M / RFH-110-PC

[0069] 14. To ensure the accuracy of the setting, the referencing step can be repeated at regular intervals, preferably automatically. This allows deviations to be detected and / or corrected early. Preferably, the reference position described above eliminates the need for a design with the described test elements. In one embodiment, the device has a measuring device for measuring layer thicknesses and / or layer thickness profiles of the multilayer coextruded composite. The integration of this measuring device enhances the device's ability to perform precise and accurate measurements of the layer thicknesses or layer thickness profiles of the multilayer coextruded composite.This measuring device preferably enables continuous monitoring and control of the quality and homogeneity of the set layer thicknesses and / or layer thickness profiles of the multilayer coextruded composite, thereby ensuring consistently high product quality. Using the measurement data, deviations from the desired layer thicknesses and / or layer thickness profiles can be detected early, allowing for timely adjustment or correction of the process parameters to ensure optimal product quality. Process parameters include, for example, the actuation positions of the setting elements. However, they can also include other variable parameters of the device, such as processing temperature or operating pressure. The integration of a measuring device for layer thickness and / or layer thickness profile measurement preferably contributes to reducing scrap and rework.

[0070] Preferably, the adjustment elements are controllable based on the measurement data acquired by the measuring device. This enables direct adjustment of the settings based on the measured layer thicknesses and / or layer thickness profiles of the multilayer coextruded composite. Linking the measuring device to the actuation of the adjustment elements allows for automated control and fine-tuning of the process to ensure a precise and uniform layer thickness distribution. Using the acquired measurement data to control the adjustment elements contributes to improved production accuracy and efficiency by enabling the early detection and correction of potential sources of error. This allows for continuous, real-time adjustment of the process parameters to ensure optimal layer thickness and quality of the multilayer coextruded composite. MEISSNER BOLTE M / RFH-110-PC

[0071] 15

[0072] The automated control of the setting elements based on the measuring device data ensures precise and consistent production of the multi-layer coextrusion composite.

[0073] According to a second aspect of the invention, the present problem is solved in particular by a system for producing a coextruded multilayer film with at least one extruder unit for providing material melts from thermoplastic materials. The system according to the invention further comprises a device for coextruding of the type described above. The system according to the invention also comprises a control unit for controlling and / or regulating the system, wherein the control elements are configured so that they can be actuated depending on control signals.

[0074] In one embodiment, the control signals can be automatically generated based on the measured layer thicknesses and / or layer thickness profiles. This preferably means that the control signals are generated based on real-time data from the measuring device in order to adjust the setting elements accordingly and ensure precise control of the multilayer coextrusion composite. This automatic generation of the control signals enables an immediate response to changes in the layer thicknesses or profiles and ensures continuous optimization of the manufacturing process.

[0075] Furthermore, control signals can be generated based on readable or storable recipes. This means that predefined parameters and settings, which can be specified in recipes, can serve as the basis for generating the control signals. The readability or storability of recipes facilitates the adaptation and reuse of specific process parameters and settings, resulting in simplified handling and flexibility in the production of different product variants. A preferred combination of these functions enables optimized and precise control of the production process based on current measurement data and predefined recipes. This leads to improved efficiency, repeatability, and quality of the manufactured multilayer coextruded composite, effectively meeting the requirements of diverse production needs. MEISSNER BOLTE M / RFH-110-PC

[0076] 16

[0077] The formulations for thermoplastic materials are preferably suitable for the individual layers of a co-extruded multilayer film and are preferably automatically adjustable. This means that the settings for the specific thermoplastic materials used in the individual layers of the multilayer film can be automatically adjusted to meet the requirements of the manufacturing process. It is therefore possible to store predefined layer thicknesses and / or layer thickness profiles for individual thermoplastic materials and retrieve them as needed. This allows the device to automatically adapt to a new thermoplastic material when switching to it. Individual layer thicknesses and / or layer thickness profiles can be set to predefined values ​​during the transition to a different material.The automatic adaptability of the recipes enables efficient handling and control of material parameters, including temperature, flow properties and mixing ratios, to achieve the desired properties and quality standards of the individual layers.

[0078] In one embodiment, the system includes an output unit configured to visualize the relative positions of adjustment elements and / or extrusion channel cross-sections within the coextrusion adapter. This is achieved, in particular, by displaying a graphical model that illustrates the specific positions of the adjustment elements and extrusion channel cross-sections within the coextrusion adapter. This visual representation allows operators to intuitively track and monitor the configured settings and the progress of the extrusion process. This representation enables a clear and detailed visualization of the complex structures and interactions within the coextrusion adapter, facilitating effective control and monitoring of the production process.The visual representation of the relative positions of the adjustment elements and extrusion channel cross-sections within the coextrusion adapter contributes to improved process control and optimization, as deviations or anomalies can be quickly detected and corrected. This leads to increased efficiency, precision, and consistency in the production of coextruded products and helps to minimize defects and scrap. MEISSNER BOLTE M / RFH-110-PC.

[0079] 17

[0080] In one embodiment, the system includes an input unit designed for entering and / or reading data, particularly layer thicknesses and / or layer thickness profiles. This input unit enables operators to input or read relevant production parameters and properties into the system to precisely control and monitor the co-extrusion process. The data that can be read in could include, for example, the aforementioned recipes. The input unit facilitates the integration of real-time data and parameters into the production process to enable continuous adjustment of layer thicknesses and / or layer thickness profiles. By entering and reading data on layer thicknesses and / or layer thickness profiles, operators can optimize the system's performance and ensure that the manufactured products meet the required quality standards.

[0081] In one embodiment, the system includes a storage device for storing data relating to recipes for thermoplastic materials for individual layers. This storage device preferably enables the recording and storage of specific recipes used for processing the individual layer thicknesses and / or layer thickness profiles of the coextrusion process. The stored recipes preferably serve as a reference for the precise configuration and adjustment of the thermoplastic materials and support precise and reliable production. Preferably, the storage device has a data interface for the system control to enable seamless integration and communication with the system's control system.This facilitates access to saved recipes during operation and enables automated adjustment and updating of process parameters based on the stored data. Furthermore, the storage device is preferably capable of storing data regarding the relative positions of adjustment elements in relation to recipes for thermoplastic materials for the corresponding individual layers. By storing this information, the specific configurations and settings of the adjustment elements can be precisely documented and managed to ensure reproducible and consistent production of coextruded products.

[0082] In one embodiment, the system control has electrical data interfaces, in particular electronic or digital data interfaces, which are suitable for MEISSNER BOLTE M / RFH-110-PC.

[0083] 18. Communication with the existing control unit and / or storage device can be used. These data interfaces preferably serve as an interface for data exchange and communication between different components of the system to ensure smooth operation and efficient data transmission.

[0084] Electrical data interfaces allow information and commands to be sent and received, for example, to the control unit and storage device. This enables effective control and monitoring of the production process, as well as the management and querying of operational data to monitor and optimize the plant's status and performance. Ideally, electronic or digital data interfaces facilitate the exchange of operational data with other plants or systems, enabling seamless integration and networking within production environments. The transfer of operational data between different plants promotes efficiency, flexibility, and control over the entire production process.

[0085] The problem is solved in a third aspect, in particular, by a method for co-extruding a multi-layer co-extruded composite with a device for co-extruding a multi-layer co-extruded composite, especially a device of the type described above. The method is characterized in particular by the fact that a main layer of the co-extruded composite is produced in a main channel, while at least one co-extruded layer of the co-extruded composite, connected to the main layer, is produced in at least one co-extrusion channel. The layer thickness and / or the layer thickness profile of the layers of the co-extruded composite is adjusted by means of a plurality of actuable adjusting elements, in that the adjusting elements are actuated by means of at least one actuating device.The at least one adjusting device is movable in such a way as to be positioned on the adjusting elements, so that an actuating device of the adjusting device can be brought into operative contact with each adjusting element for actuating the respective adjusting element.

[0086] In one embodiment of the method, a measuring device is arranged after the assembly of the multilayer coextruded composite. This measuring device is a MEISSNER BOLTE M / RFH-110-PC.

[0087] 19. The measuring device records layer thicknesses and / or layer thickness profiles of the multilayer coextruded composite, preferably immediately after the coextrusion process. Alternatively, the measuring device can also be positioned further back in the production direction, so that changes in layer thicknesses and / or layer thickness profiles that may occur shortly after the coextrusion composite is assembled are taken into account. These changes can be measured by the measuring device. The recorded data serves as important feedback for quality control and process control. The system control preferably reacts depending on the recorded layer thicknesses and / or layer thickness profiles by activating the adjustment device to adapt the setting elements. The adjustment device is actuated, in particular, inline to adjust the layer thicknesses and profiles according to the required specifications and quality standards.This enables real-time correction and optimization of the co-extrusion process and contributes to continuous and automated quality control. The combination of a precise measuring device with a responsive and efficient system control allows for automated and precise adjustment of the settings in real time to ensure high product quality and consistency.

[0088] In one embodiment of the method, the layer thicknesses and / or layer thickness profiles of the multilayer film are measured and recorded immediately after exiting a die section of a coextrusion device. Preferably, measurement data is generated that provides precise information about the actual layer thicknesses and / or layer thickness profiles. Based on this recorded measurement data, the adjustment elements for fine-tuning the coextrusion channels of the coextrusion device are manipulated. This manipulation is performed inline, meaning that the adjustments are made continuously during the ongoing production process. The inline manipulation of the adjustment elements is performed in direct response to the measured layer parameters to ensure precise control and optimization of the layer thicknesses and profiles.This design enables real-time control and adjustment of the coextrusion parameters to ensure that the produced layers meet the desired specifications and quality standards. MEISSNER BOLTE M / RFH-110-PC.

[0089] 20

[0090] In one embodiment of the method, the layer thicknesses and / or layer thickness profiles of the multilayer coextruded composite are manipulated by the adjusting elements. The relative positions of these elements within the coextrusion apparatus are adjusted according to the recipes for thermoplastic materials for individual layers stored in the system control. The adjustment of the layer thicknesses and / or layer thickness profiles is preferably carried out taking into account the stored recipes, which contain specific parameters and specifications for the individual layers of the coextruded composite. By precisely controlling the relative positions of the adjusting elements according to the stored recipes, the desired layer thicknesses and / or layer thickness profiles can be achieved in accordance with the defined specifications.The use of the stored formulas ensures consistent and reliable production of multilayer films with the required layer properties and dimensions according to the specific product requirements and standards.

[0091] In one embodiment of the method, the layer thicknesses and / or layer thickness profiles of the multilayer coextrusion composite are manipulated using adjustment elements for fine-tuning the coextrusion channels of the coextrusion device. In this embodiment, the relative positions of the adjustment elements within the coextrusion channels, in particular the absolute gaps of extrusion channel cross-sections, are visualized using an optical output unit, employing a graphical model of the coextrusion device. This optical representation of the relative positions of the adjustment elements, based on a graphical model of the coextrusion device, provides operators with visual feedback on the actual adjustments and settings in the coextrusion channels.

[0092] A preferred method is provided for operating a plant for producing a coextruded multilayer film, wherein the plant is designed according to the type described above. It is further preferred that a device for coextruding a coextruded multilayer film is used, in particular a device of the type described above. MEISSNER BOLTE M / RFH-110-PC

[0093] 21

[0094] It should be noted here that all process steps disclosed in relation to the device and / or plant can also be carried out within the framework of the disclosed process. Accordingly, properties and / or components disclosed within the framework of the process can also be used within the framework of the disclosed device and / or plant.

[0095] Further advantages and aspects of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are explained below with reference to the schematic figures.

[0096] Figures 1 to 4 show the operating mode of a device according to the invention for co-extruding a multi-layer co-extrusion composite in a sectional view transverse to the co-extrusion composite.

[0097] Fig. 5 shows a side view of a device according to the invention for co-extruding a multi-layer co-extrusion composite.

[0098] Fig. 1 shows a cross-sectional view of a device 10 according to the invention for co-extruding a multi-layer co-extruded composite 100, looking across the co-extruded composite 100. The device 10 is shown with a main channel 20. The main channel 20 serves to generate a main layer 22 of the co-extruded composite 100. In this embodiment, a continuous main layer melt stream of a thermoplastic material, supplied by an extruder (not shown), is fed into the device 10 from above, forming the main layer 22. The melt stream is conveyed downwards through the device 10 along the conveying direction 2.

[0099] The main layer 22 is conveyed to actuated adjustment elements 24 and 24', which are arranged on both flat sides of the main layer 22. The adjustment elements 24 and 24' serve, firstly, to adjust the layer thickness of the main layer 22. Secondly, the actuated adjustment elements 24 and 24' serve to adjust the respective layer thickness of a first coextrusion layer 32 and 32'. MEISSNER BOLTE M / RFH-110-PC

[0100] 22

[0101] Not shown is that further adjustment elements are located behind the adjustment elements 24 and 24'. Due to the large number of adjustment elements along the layer width, not only can the layer thickness of the main layer 22 and the first co-extrusion layer 32 and 32' be set, but also a layer thickness profile, i.e., a different layer thickness of the respective layer along its width.

[0102] In the conveying direction 2 after the adjusting elements 24 and 24', in this embodiment, coextrusion channels 30 and 30' are provided on both flat sides of the main layer 22 to produce the coextruded layer 32 and 32' of the coextruded composite 100, each connected to the main layer 20. In other words, a three-layer coextruded composite 100 is present at this point, comprising a main layer 22 in the middle and having the first coextruded layer 32 and 32' on each flat side. In this embodiment, a continuous coextruded layer melt stream, supplied by an extruder (not shown) and made of a thermoplastic material, is conveyed into the device 10 through conveying channels 33, 33', 43, 43'.

[0103] The now three-layer coextrusion composite 100 is conveyed further in conveying direction 2.

[0104] In the conveying direction 2 after the adjusting elements 34 and 34', in this embodiment, a further coextrusion layer 42 and 42' of the coextrusion composite 100, connected to the coextrusion layer 32 and 32', is added on both outer flat sides of the three-layer coextrusion composite 100 in a further coextrusion channel 40 and 40'.

[0105] The three-layer coextrusion composite 100 is conveyed to actuable adjusting elements 34 and 34', which are arranged on both flat sides of the three-layer coextrusion composite 100.

[0106] The adjusting elements 34 and 34' each serve, firstly, to adjust the layer thickness of the first coextrusion layer 32 and 32'. Secondly, the actuated adjusting elements 34 and 34' each serve to adjust the layer thickness of a further coextrusion layer 42 and 42'. MEISSNER BOLTE M / RFH-110-PC

[0107] 23

[0108] Not shown is the fact that further adjustment elements are located behind adjustment elements 34 and 34'. Due to the large number of adjustment elements along the layer width, not only can the layer thickness of the two further coextrusion layers 42 and 42' be set, but also a layer thickness profile.

[0109] In other words, a five-layer coextruded composite 100 is present at this point, comprising a main layer 22 in the middle and having a first coextruded layer 32 and 32' on each flat side of the main layer 22. At this point, the coextruded composite 100 has a further coextruded layer 42 and 42' on each of the outer flat sides of the first coextruded layer 32 and 32'. The five-layer coextruded composite 100 is then extruded through a die (not shown).

[0110] The adjusting elements 24, 24', 34, 34' are each pivotally mounted about an axis 26, 26', 36, 36'. They have a sealing element (not shown), for example, a plastic insert, which prevents the thermoplastic material from being forced behind the adjusting elements 24, 24', 34, 34'. The sealing elements thus seal the area between the conveying channels 30, 30', 40, 40' of the device 10 and the adjusting elements 24, 24', 34, 34'. The adjusting elements 24, 24', 34, 34' each have a cam 28, 28', 38, 38' on the side facing away from the channel, which engages with a rocker arm 29, 29', 39, 39'. The rocker arm 29, 29', 39, 39' can, through a linear movement and engagement with the adjusting element 24, 24', 34, 34', move the adjusting element 24, 24', 34, 34' in the coextrusion channel and thus vary the channel diameter. So that the rocker arm 29, 29', 39...Since the adjusting element 24, 24', 34, 34' can be moved from outside the device 10, the rocker arm 29, 29', 39, 39' has an actuating element 50, 50', 60, 60', which in this embodiment is designed as a rotatable actuating element 50, 50', 60, 60'. By rotating the actuating element 50, 50', 60, 60', the adjusting element 24, 24', 34, 34' can be actuated from the outside by means of the actuating element 50, 50', 60, 60'. In addition to the actuating element 50, 50', 60, 60', the rocker arm 29, 29', 39, 39' also has a measuring pin 52, 52', 62, 62' in this embodiment. This measuring pin 52, 52', 62, 62' is provided with markings which can be used to determine how far the adjusting element 24, 24', 34, 34' is inserted into the corresponding MEISSNER BOLTE M / RFH-110-PC.

[0111] 24

[0112] the coextrusion channel protrudes into it, or which channel cross-section is ultimately set on the coextrusion channel.

[0113] The device 10 further comprises an adjusting device 200 on each side for actuating the adjusting elements 24, 34, wherein the adjusting device 200 is movable to be positioned on the adjusting elements 24, 34, so that an actuating device 70 of the adjusting device 200 can be brought into operative contact with each adjusting element 24, 34 for actuating the respective adjusting element 24, 34. The adjusting device 200 is thus movable between the upper adjusting elements 24 and the lower adjusting elements 34. The adjusting device 200 is also movable between the respective adjusting elements 24 and 34 shown in Figure 5, which are located next to the adjusting elements 24 and 34 shown in Figures 1 to 4. In this embodiment, the adjusting device 200 is attached to guide elements 70, 72, 74, 76, which are designed as guide rails.The actuating device 70 is movable up and down and forward and backward on a slide 80. To actuate an adjustment element 24, 34, the actuating device 70 is movable on the slide 80 to the position of the respective adjustment element 24, 34 in order to actuate the adjustment element 24, 34.

[0114] Figure 1 shows the adjusting device 200 with the actuating device 70 in a starting position, in which it is not in contact with either of the adjusting elements 24 or 34. In Figure 2, the adjusting device 200 has moved from its starting position and is moving towards its assigned target location, the adjusting element 34. In Figure 3, the actuating device 70 of the adjusting device 200 has been moved towards the actuating element 60 of the adjusting element 34, so that the actuating element 60 is operatively connected to the adjusting element 34. In Figure 4, the actuating element 60 has actuated the adjusting element 34 in such a way that the adjusting element 34 no longer projects as far into the coextrusion channel 40, so that the coextrusion layer 42 will be thinner at this point than before.

[0115] The side view in Fig. 5 shows the device 10 for co-extruding a multi-layer co-extruded composite 100 from the side. In this embodiment, eight actuable adjusting elements 24 and 34 are each integrated into a MEISSNER BOLTE M / RFH-110-PC.

[0116] 25

[0117] The adjustment elements 24 and 34 are arranged in two superimposed rows. Measuring pins 52 and 62 are located below each of the adjustment elements 24 and 34. The adjustment device 200 is mounted on the guide elements 70, 72, 74, and 76 and is movable along threaded rods 90 and 92 and guide rods 94 and 96. The carriage 80 carries the actuating device 70. The adjustment device 200 can be moved vertically by means of a first motor 91, in particular a first electric motor, and horizontally by means of a second motor 93, in particular a second electric motor. The actuating device 70 of the adjustment device 200 can be brought into operative contact with the respective adjustment element 24 or 34 by means of a pneumatic cylinder 95 to actuate the adjustment element 24 or 34.The device 10 has a measuring device for measuring layer thicknesses or layer thickness profiles of the multilayer coextrusion composite 100, which is positioned on the slide 80 under the actuating device 70 and is therefore not visible in this illustration.

[0118] MEISSNER BOLTE M / RFH-110-PC

[0119] 26

[0120] Reference numeral list

[0121] 2 Direction of conveyance

[0122] 10 Device

[0123] 20 Main Channel

[0124] 22 Main layer

[0125] 24, 24', 34, 34' Adjustment element

[0126] 26, 26', 36, 36' axle

[0127] 28, 28', 38, 38' Cam

[0128] 29, 29', 39. 39' rocker arm

[0129] 30, 30' Coextrusion Channel

[0130] 40, 40' further coextrusion channel

[0131] 32, 32' first coextrusion layer

[0132] 33, 33', 43, 43' Conveyor channel

[0133] 42, 42' further coextrusion layer

[0134] 50, 50', 60, 60' Actuating element

[0135] 52, 52', 62, 62' Measuring pin

[0136] 70 Actuating device

[0137] 70 72, 74, 76 Guide element MEISSNER BOLTE M / RFH-110-PC

[0138] 27

[0139] 80 sleds

[0140] 90, 92 threaded rods

[0141] 91 first engine

[0142] 93 second engine

[0143] 94, 96 Driving rod

[0144] 95 pneumatic cylinders

[0145] 100 Co-extrusion composite

[0146] 200 Adjustment device

Claims

MEISSNER BOLTE M / RFH-110-PC 28 Claims 1. Device (10) for co-extruding a multi-layer co-extrusion composite (100), in particular a co-extruded multi-layer film, comprising a. a main channel (20) for producing a main layer (22) of the co-extrusion composite (100), b. at least one co-extrusion channel (30, 30', 40, 40') for producing at least one co-extrusion layer (32, 32', 42, 42') of the co-extrusion composite connected with the main layer (22), c.a plurality of actuable adjusting elements (24, 24', 34, 34') for adjusting layer thicknesses or layer thickness profiles of the layers of the coextrusion composite (100), characterized by at least one adjusting device (200) for actuating the adjusting elements (24, 24', 34, 34'), wherein the at least one adjusting device (200) is displaceable in such a way as to be positioned on the adjusting elements (24, 24', 34, 34') so that an actuating device (70) of the adjusting device (200) can be brought into operative connection with each adjusting element (24, 24', 34, 34') for actuating the respective adjusting element (24, 24', 34, 34').

2. Device (10) according to claim 1, characterized in that the adjusting device (200) is displaceable in height and width of the device (10), preferably along guide elements (70, 72, 74, 76).

3. Device (10) according to one of the preceding claims, characterized in that the adjusting device (200) can be adjusted in height and height by means of a first motor (91), in particular by means of a first electric motor. MEISSNER BOLTE M / RFH-110-PC 29 can be displaced in the width of the device (10) by means of a second motor (93), in particular by means of a second electric motor.

4. Device (10) according to one of the preceding claims, characterized in that the actuating device (70) of the adjusting device (200) can be brought into operative contact with the respective adjusting element (24, 24', 34, 34') by means of a pneumatic cylinder (95) for actuating the adjusting element (24, 24', 34, 34').

5. Device (10) according to one of the preceding claims, characterized in that the adjusting elements (24, 24', 34, 34') are mounted in such a way as to remain in their respective axial position when the respective adjusting element (24, 24', 34, 34') is actuated.

6. Device (10) according to one of the preceding claims, characterized in that each of the adjusting elements (24, 24', 34, 34') is assigned a test element (52, 62) which provides information about the respective actuation position of the assigned adjusting element (24, 24', 34, 34').

7. Device (10) according to one of the preceding claims, characterized in that the device has a test unit which is designed to determine the respective actuation position of an adjusting element (24, 24', 34, 34') by means of a detectable deviation from a reference position. MEISSNER BOLTE M / RFH-110-PC 30 8. Device (10) according to one of the preceding claims, characterized in that the device (10) has a measuring device for measuring layer thicknesses or layer thickness profiles of the multilayer coextrusion composite (100).

9. Plant for producing a multilayer coextrusion composite with at least one extruder unit for providing material melts from thermoplastic materials, with a device (10) according to claims 1 to 8, a. with a control unit for controlling and / or regulating the plant, wherein b. the control unit is configured so that the setting elements can be actuated depending on control signals.

10. System according to claim 9, characterized in that a. the control signals can be generated on the basis of measured layer thicknesses and / or layer thickness profiles, and / or that b. the control signals can be generated on the basis of readable or storable recipes.

11. System according to one of claims 9 or 10, characterized in that an input unit for entering and / or reading data, in particular layer thicknesses and / or layer thickness profiles, is provided.

12. Method for co-extruding a multi-layer co-extrusion composite (100) with a device (10) for co-extruding a multi-layer co-extrusion composite, in particular a device (10) according to any one of claims 1 to 9, MEISSNER BOLTE M / RFH-110-PC 31 a. wherein a main layer (22) of the coextruded composite (100) is produced in a main channel (20), and b. wherein at least one coextruded layer (32, 32', 42, 42') of the coextruded composite (100) connected with the main layer (22) is produced in at least one coextrusion channel (30, 30', 40, 40'), and c. wherein a layer thickness or a layer thickness profile of the layers of the coextruded composite (100) is set by means of a plurality of actuable adjusting elements (24, 24', 34, 34'), in which the stem elements (24, 24', 34, 34') are actuated by means of at least one adjusting device (200) for actuating the adjusting elements (24, 24', 34, 34'), and wherein d. which at least one adjusting device (200) is moved to be positioned on an adjusting element (24, 24', 34, 34'), and e. an actuating device (70) of the adjusting device (200) is brought into operative contact with the adjusting element (24, 24', 34, 34'), and f.The setting element (24, 24', 34, 34') is activated.

13. Method according to claim 12, characterized in that a. the at least one adjusting device (200) is relocated to be positioned on a further adjusting element (24, 24', 34, 34'), and b. the actuating device (70) of the adjusting device (200) is brought into operative contact with the further adjusting element (24, 24', 34, 34'), and c. the further adjusting element (24, 24', 34, 34') is actuated.

14. Method according to one of claims 12 and 13, characterized in that a. a measuring device is arranged after the assembly of the multilayer coextrusion composite (100), which detects layer thicknesses and / or layer thickness profiles of the multilayer coextrusion composite (100), and MEISSNER BOLTE M / RFH-110-PC 32 b. a plant control system actuates the adjusting device (200) the adjusting elements (24, 24', 34, 34') depending on the detected layer thicknesses and / or layer thickness profiles, in particular actuated inline.

15. Method according to one of claims 12 to 14 characterized in that a. the layer thicknesses and / or layer thickness profiles on the coextruded multilayer film are manipulated by means of the adjusting elements (24, 24', 34, 34'), wherein b. relative positions of the adjusting elements (24, 24', 34, 34') are manipulated within the recipes for thermoplastic materials for individual layers stored on a plant control system.

16. Method for operating a plant for producing a coextruded multilayer film, in particular a plant according to any one of claims 9 to 11, and / or a. a device (10) for coextruding a coextruded multilayer film, in particular a device (10) according to any one of claims 1 to 7, b. using a method according to any one of claims 12 to 13.

Images