Perforated Entangling Drum Structure for Uniform Water Drainage
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Solution Overview
Problem
Existing perforated rotary drums used in water jet textile production have issues with uniformity of water and air aspiration, leading to inefficiencies and defects in non-woven fabrics, particularly due to the rigidity and size of the drums, which cause sticking of textile materials and frequent maintenance needs.
Innovation Solution
A rotary drum design with a surface featuring recessed parts machined on the outer side face, allowing for a controlled ratio of perforations and solid parts, providing improved drainage and reducing material sticking, while maintaining the ability to easily remove and replace outer sleeves without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick rigid perforated drums are used as support, then structural strength and stability are improved, but the open surface area is reduced to 30-60% causing non-uniform aspiration and drainage
Solution Approach 1:
The drum surface is segmented into alternating circumferential bands of solid parts and perforated parts, creating a periodic structure that optimizes both structural support and drainage functionality. This segmentation allows the drum to maintain strength while maximizing open surface area for water aspiration.
Solution Approach 2:
Different regions of the drum surface are given different properties: solid bands provide structural strength and stability, while perforated bands provide drainage and aspiration functions. This local differentiation resolves the contradiction between needing strength and needing maximum open area.
2Ease of manufacture
If drums with 30-60% open surface are used, then manufacturing simplicity is improved, but water drainage uniformity and jet efficacy are worsened
Solution Approach 1:
The drum is divided into discrete solid bands and perforated bands, each with standardized dimensions. This segmentation simplifies manufacturing while ensuring uniform drainage patterns across the drum surface, as the periodic structure creates consistent aspiration zones.
Solution Approach 2:
The invention optimizes specific parameters including the width ratio of solid to perforated bands, the diameter and distribution of perforations, and the overall open surface area percentage. These parameter adjustments achieve both manufacturing feasibility and drainage uniformity.
3Productivity
If coarse-mesh metal fabric is interposed between drum and sleeve, then water drainage is improved, but material sticking increases requiring frequent cleaning
Solution Approach 1:
The invention removes the coarse-mesh metal fabric intermediary layer that caused sticking problems. Instead, it directly optimizes the drum surface geometry with properly designed perforated bands that achieve effective drainage without the sticking issues introduced by fabric intermediaries.
Solution Approach 2:
The drum incorporates directly-formed porous structures through the perforated bands, eliminating the need for fabric intermediaries. The controlled porosity of the drum itself provides drainage functionality without causing material sticking, as the rigid perforated structure does not create the same adhesion problems as flexible fabrics.
4Manufacturing precision
If high water pressure is used for water jets, then non-woven fabric quality is improved, but fibre sticking to the drum increases
Solution Approach 1:
The invention optimizes the geometry parameters of the perforated bands including hole size, distribution, and band width ratios. These parameter optimizations enable the drum to handle high water pressures effectively for quality fabric production while the optimized geometry prevents fibre sticking by reducing turbulence and dead zones where fibres could accumulate.
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
The drum design ensures uniform water drainage and improved quality of non-wovens, preventing material sticking and defects, even at high water pressures, with easy removal of outer sleeves and no impressions from the drum.
Implementation Method 1
vacuum aspiration of air inside the drum, facing the injectors that supply the water jets
Implementation Method 2
the cohesion and intertwining of the elementary fibres with one another are achieved by the action of a plurality of high-pressure water jets passing through a fabric or cloth moving over a perforated support
Data Source
AI summary
The invention relates to a drum wherein the lateral surface thereof is provided with perforations that are separated by full parts from recessed parts and which are present on the full parts with an outer lateral surface. Application: in an entanglement machine for a nonwoven, using water jets.