Multi-Row Coaxial Melt-Blown Plant With Removable Spinneret Cassette
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Solution Overview
Problem
Multi-row coaxial melt-blown type plants face challenges in assembly and disassembly, require numerous components, are not compact, and are limited to producing a single row of nonwoven fabric, leading to high costs and maintenance issues due to the need for precise alignment of multiple plates and tubes under high processing temperatures.
Innovation Solution
A multi-row coaxial melt-blown type plant design featuring a distributor with a housing for the spinneret and a jig that allows easy assembly and disassembly, reduces the number of components, and enables production of multiple rows of polymeric filaments using a single device, incorporating a transfer device for efficient fluid and gas distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple plates and tubes are used to maintain coaxiality, then the reliability of the plant is improved, but the device complexity increases and assembly becomes more difficult
Solution Approach 1:
The patent combines multiple functions into a single integrated spinneret structure that houses all tubes and maintains their coaxiality through internal positioning features, eliminating the need for separate alignment plates and reducing the overall number of components while maintaining reliability
Solution Approach 2:
The spinneret structure nests multiple tubes within a single housing component, with each tube positioned coaxially through internal features of the spinneret body, creating a compact nested arrangement that simplifies assembly while maintaining precise alignment
2Manufacturing precision
If multiple plates and tubes are used to ensure precise alignment, then the manufacturing precision is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The alignment features are merged into the spinneret structure itself during a single manufacturing process, eliminating the need for separate alignment operations with multiple plates and reducing assembly complexity while maintaining high precision
Solution Approach 2:
The spinneret is pre-manufactured with built-in alignment features and positioning structures that automatically ensure coaxiality during assembly, performing the alignment function in advance during the spinneret fabrication process rather than during plant assembly
3Reliability
If numerous components are used, then the reliability is improved, but the ease of repair deteriorates
Solution Approach 1:
The plant is segmented into modular units with the spinneret as a self-contained module that can be easily removed and replaced, allowing maintenance of individual components without disassembling the entire structure and simplifying repair operations while maintaining operational reliability
4Productivity
If a single device produces multiple rows, then the productivity is improved, but the device complexity increases
Solution Approach 1:
The spinneret is designed as a universal component with multiple tube housings and distribution channels that can simultaneously produce multiple rows of filaments, allowing a single device to perform multiple production functions and increase productivity without proportionally increasing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Facilitates easy assembly and maintenance, reduces component count, allows production of multiple rows, enhances fabric quality, and lowers operational and conversion costs while maintaining coaxiality and reducing axial losses.
Implementation Method 1
The acceleration conduits include, or may consist of, tubes having a substantially tubular cylindrical and/or, at least in part, conical shape and defining diameters usually between 0.6 and 1 mm, and including, or not, at least one inner converging section adapted to allow the acceleration of the first polymeric fluid in transit inside them.
Implementation Method 2
the tubes transiting coaxially inside the holes in such a way as to allow the diffusion of polymeric fluid and, at the same time, the diffusion of air or gas from at least part of the holes
Implementation Method 3
an outer jig, or outer air plate, usually of divergent shape, from which the polymeric filament emerges, pushed downwards from the air
Data Source
Figure 1~2
Figure 3~4
Figure 5a
AI summary
A multi-row coaxial melt-blown type plant (1) is provided comprising a support (2) including one or more first conduits (20) configured to convey polymeric fluid parallel to a dispensing direction (2a) and at least one second conduit (21) configured to convey air or gas, a cassette (3) removably constrained to the support (2) and including a plurality of acceleration conduits (30) extending parallel to the dispensing direction (2a) comprising tubes (10) in fluid passage connection with one or more first conduits (20) and configured to distribute the polymeric fluid, first holes (31) extending parallel to the dispensing direction (2a), centered and spaced with respect to the acceleration conduits (30) along the dispensing direction (2a) and configured to house each part of a respective tube (10), second holes (32) extending parallel to the dispensing direction (2a) and adapted to allow the passage of air or gas, and a slit (33) extending transversely to the dispensing direction (2a) between the acceleration conduits (30) and the first holes (31) in fluid passage connection with the second holes (32), wherein the support (2) comprises a housing (22) configured to contain the cassette (3) and the slit (33) extends in the cassette (3) from side to side so as to be in fluid passage connection with the second conduit (21) and configured to convey air or gas from the second conduit (21) to the second holes (32).