Coextrusion Adapter Edge Layer Displacement
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Solution Overview
Problem
Coextrusion adapters face challenges in efficiently and flexibly removing unwanted layers from the edge area during the production of multilayer films, especially when dealing with different viscosities and layer structures, leading to material wastage and reduced reusability of expensive or difficult-to-recycle materials.
Innovation Solution
The coextrusion adapter features receiving bores in the side walls of the central channel for displacement elements or closure elements, allowing for selective displacement of layers from the edge area, with adjustable displacement noses and closure elements that can be easily swapped during production changes, ensuring flexible layer management and minimizing material loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If edge strips are cut off during multilayer film production, then uniform layer thickness is achieved in the central region, but material is wasted and reprocessability is impaired
Solution Approach 1:
The patent segments the extrusion process into distinct zones: a central region for producing uniform multilayer film and edge regions for controlled layer displacement. This segmentation allows the edge strips to be selectively removed with specific layers while preserving the quality of the central region, reducing material waste of expensive or difficult-to-recycle materials.
Solution Approach 2:
The invention applies different quality requirements to different regions of the extruded product. The central region maintains full multilayer structure for high-quality film production, while the edge regions are designed for layer displacement to eliminate unwanted layers. This local differentiation optimizes both product quality and material efficiency.
2Reliability
If separate melt channels are used for edge regions, then edge encapsulation is achieved, but device complexity increases and flexibility is reduced
Solution Approach 1:
The patent merges the edge region functionality into the existing central channel structure by using adjustable separating elements that can be positioned within the central channel. This eliminates the need for separate melt channels while achieving the same edge encapsulation effect, thereby reducing device complexity and increasing flexibility for different layer configurations.
Solution Approach 2:
The invention introduces dynamically adjustable separating elements that can be repositioned along the central channel to adapt to different layer sequences and product requirements. This dynamic capability provides the flexibility of multiple channels without the permanent structural complexity, allowing optimization for various multilayer configurations.
3Manufacturing precision
If adjustable separating elements are used in the central channel, then symmetrical composites with edge encapsulation can be produced, but flexibility for selective layer displacement is limited
Solution Approach 1:
The patent enhances the functionality of adjustable separating elements by making them movable along the central channel and capable of selective positioning. This allows the separating elements to adapt to different layer sequences, asymmetrical composites, and varying edge encapsulation requirements, significantly increasing versatility while maintaining manufacturing precision.
Solution Approach 2:
The adjustable separating elements are designed to perform multiple functions: creating edge encapsulation for symmetrical composites, enabling selective layer displacement for asymmetrical composites, and adapting to different layer sequences. This multi-functionality eliminates the need for different device configurations for different product types.
4Adaptability or versatility
If displacement elements with receiving bores are used, then selective layer displacement from edge area is enabled, but device complexity increases
Solution Approach 1:
The patent segments the displacement function into modular displacement elements with receiving bores that can be independently positioned and adjusted. This modular segmentation allows selective layer displacement while keeping the overall device complexity manageable through standardized, interchangeable components.
Solution Approach 2:
The receiving bores act as intermediaries between the displacement elements and the melt flow, providing a controlled interface for layer displacement. This intermediary structure simplifies the interaction between the mechanical displacement elements and the viscous melt, reducing the overall system complexity.
Data Source
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AI summary
The invention relates to a coextrusion adapter comprising a central channel (10) with an inlet-side end (100) and an outlet-side end (101), as well as bottom and top walls (102, 103) limiting the height of the central channel (10) and side walls (104, 105) limiting the width of the central channel (10), further comprising at least one coextrusion channel (11, 12, 13) with an inlet end (110, 120, 130) and an outlet end (112, 122, 132), wherein the outlet end (112, 122, 132) opens into the central channel (10) downstream of the inlet-side end (100) in the region of the bottom and/or top wall (102, 103) and each outlet end (112, 122, 132) of the at least one coextrusion channel (11, 12, 13) adjustment devices are provided which consist of a plurality of adjustment elements (6) which together extend over the width of the discharge end (112, 122, 132) and are adjustable independently of one another by means of actuators (7) in such a manner thatthat the clear width of the respective width section of the outlet end (112, 122, 132) is variable, wherein adjacent to the outlet end (112, 122, 132) at least one of the side walls (104, 105) has a receiving bore (90) into which a displacement element (9) projecting beyond the side wall (104, 105) into the central channel (10) can be inserted.