Extrusion Mouthpiece with Movable Core Support for Internal Channels
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Solution Overview
Problem
Existing mouthpieces for producing formed bodies with internal channels fail to ensure a single-piece formation, as cores can move during the extrusion process, leading to incomplete or flawed products.
Innovation Solution
A mouthpiece design featuring a first core retaining plate for axial and lateral fixation of cores upstream and a second core retaining plate that is loosely arranged downstream to secure cores radially during the initial extrusion phase, allowing for unimpeded flow and subsequent removal to prevent interference, combined with conical cores and tapered molding compound passage openings to optimize flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cores are rigidly fixed throughout the extrusion path, then core position stability is improved, but the molding compound flow is impeded and single-piece formation is compromised
Solution Approach 1:
The mouthpiece is divided into two distinct core retaining plates: a first core retaining plate that provides stable radial support throughout extrusion, and a second core retaining plate that is loosely arranged to allow molding compound flow. This segmentation enables different sections to fulfill different functions - the first plate ensures core position stability while the second plate prevents flow interference, resolving the contradiction between stability and flow quality.
Solution Approach 2:
The second core retaining plate is designed to be dynamically removable - it is loosely arranged and can be pushed away in the flow direction by the extruding molding compound. This dynamic characteristic allows the plate to provide initial radial support during startup, then automatically retreat to avoid impeding the molding compound flow, thereby maintaining both core stability during critical phases and uninterrupted flow during production.
2Reliability
If a second core retaining plate is added to secure cores radially, then core position reliability is improved, but device complexity increases
Solution Approach 1:
The second core retaining plate is designed as a temporary, disposable component that is pushed away by the molding compound during extrusion and then removed and reused for the next extrusion process. This approach allows the system to benefit from enhanced core reliability during the critical startup phase without permanently increasing structural complexity, as the plate is simply relocated and reused rather than being integrated as a permanent fixture.
3Stability of the object's composition
If cores are held firmly throughout the extrusion path, then core stability is improved, but the molding compound cannot flow unimpeded
Solution Approach 1:
The second core retaining plate transitions from a stationary support element to a dynamically removable component. During the startup phase, it provides radial support to stabilize cores. Once extrusion begins, the molding compound pushes the plate away in the flow direction, automatically converting it from a support structure to a non-obstructive element, thus maintaining both core stability during initialization and uninterrupted flow during production.
Solution Approach 2:
The core support function is segmented between two plates: the first core retaining plate provides continuous radial support, while the second core retaining plate provides temporary radial support during startup and then retreats. This segmentation allows the system to achieve core stability when needed without continuously impeding the molding compound flow.
Data Source
AI summary
A mouthpiece (10) for extruding a molding compound into a formed body which has internal channels, comprises: a mouthpiece frame (14) with a frame opening (16); a first core retaining plate (22) which is fastened in the area of an upstream end of the frame opening (16) when viewed in the flow direction (15) of the molding compound; and a plurality of longitudinal cores (28) which are axially and laterally held by an upstream end section (26) on the first core retaining plate (22). It is proposed that, furthermore, it comprises a second core retaining plate (36) which is loosely arranged downstream of the first core retaining plate (22) relative to the mouthpiece frame (14) in the flow direction (15), and in which the areas (32) of the cores (28) farther from the upstream end section (26) are arranged to be radially fixed but axially loose.