Fibrous Rod Die Assembly With Steam-Assisted Anti-Blockage Constriction
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Solution Overview
Problem
The production of high-density rods or tubes from fibrous materials is prone to failure due to blockages in the die assembly, particularly at high feed rates and compressive forces required for forming.
Innovation Solution
A method and equipment that involves introducing a treatment fluid at or near the entrance to the die constriction, in a direction not opposed to the fiber movement, to facilitate compression and shaping, using a die with conduits for fluid introduction and a mandrel to form tubular rods, and varying heat transfer through different sections of the die to optimize fiber processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high feed rates and compressive forces are applied to produce high-density rods, then productivity and product density are improved, but blockages within the die assembly occur more frequently
Solution Approach 1:
The patent applies preliminary action by introducing treatment fluid to the fibers before they enter the constriction zone of the die. This pre-treatment softens and plasticizes the fibers in advance, reducing their resistance to compression and preventing blockages before they occur during high-speed forming operations
Solution Approach 2:
The patent changes the physical parameters of the fibers by introducing treatment fluid that alters their mechanical properties. The fluid treatment modifies fiber softness, pliability, and compressibility, enabling high-density formation at high feed rates without blockages by temporarily changing the fibers' resistance characteristics
2Quantity of substance
If high compressive forces are applied to form high-density rods, then product density is improved, but the manufacturing process becomes more prone to blockages
Solution Approach 1:
The treatment fluid changes the physical parameters of the fibers, making them softer and more pliable under compression. This parameter modification allows achieving high fiber density in the final product while maintaining process stability, as the treated fibers compress more uniformly without creating blockages
Solution Approach 2:
The treatment fluid acts as an intermediary substance between the compression force and the fibers. It mediates the compression process by reducing friction and increasing fiber pliability, allowing high compressive forces to be applied reliably to achieve high density without causing blockages
3Force
If treatment fluid is introduced opposite to fiber movement direction, then fiber compression is enhanced, but fiber flow through the die is obstructed
Solution Approach 1:
The patent inverts the conventional approach by introducing the treatment fluid in the same direction as fiber movement rather than opposite to it. This directional inversion allows the fluid to enhance compression through pressure buildup while simultaneously assisting fiber flow, eliminating the contradiction between compression enhancement and flow obstruction
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
Reduces the incidence of blockages and facilitates the formation of high-density rods or tubes by improving fiber flow and shaping, enhancing the manufacturing process efficiency and product quality.
Implementation Method 1
exposing the fibres to a treatment fluid in order to fix the bundle of fibres in a desired form... contacting the fibres in the die with steam at a temperature sufficient to fuse the fibres together
Implementation Method 2
the fibres are composed of a thermoplastics material that can be softened by the application of heat
Implementation Method 3
one or more conduits through which a treatment fluid for curing the bundle of fibres may be introduced into the passage
Data Source
AI summary
A die or die assembly for forming a bundle of fibres into a rod or tube includes a body defining a passage for conducting the bundle fibres through the die from an inlet to an outlet, a constriction in the passage having an entrance shaped to form the fibres of the bundle into a desired configuration as the bundle passes through the die, and one or more conduits through which a treatment fluid e.g. steam, for curing the bundle of fibres may be introduced into the passage, and wherein at last one conduit is arranged to discharge fluid in the immediate vicinity of the entrance to the constriction to facilitate passage of the fibres through the die and reduce the risk of blockage.