Card Tape Forming Unit Perpendicular Web Guides
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Solution Overview
Problem
Existing sliver-forming units for cards face challenges in guiding fiber fleeces effectively during merging at high production speeds, leading to fibers piling up or splitting off from the intended direction, resulting in inefficient transfer to funnel-shaped guide elements.
Innovation Solution
A sliver-forming unit with two transverse slivers, guide funnels, and pressure rollers, where web guides are arranged perpendicular to the direction of movement to ensure fiber fleece guidance to the funnel, and fleece belt guides are designed to match the deflection radius and incline to prevent piling and pinching, with delimiting profiles on transverse belts to minimize fiber friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transverse belts are used to bring fiber fleece together at high production speeds, then productivity is improved, but the fiber fleece cannot be properly guided and fibers pile up or split off
Solution Approach 1:
Web guides are introduced as intermediary elements between the transverse belts and the guide funnel. These web guides actively mediate the fiber fleece flow, guiding it perpendicular to the transverse belt movement direction and ensuring reliable transfer to the funnel, thereby resolving the guidance problem at high speeds
Solution Approach 2:
The web guides redirect the fiber fleece from moving only in the transverse belt direction to also moving perpendicular to it. This dimensional change in fiber flow direction enables proper guidance into the funnel while maintaining high production speeds
2Reliability
If web guides are arranged perpendicular to the direction of movement, then fiber guidance is improved, but device complexity increases
Solution Approach 1:
The web guides serve multiple functions simultaneously: they guide the fiber fleece perpendicular to the transverse belts, transfer it to the guide funnel, and prevent fibers from piling up or splitting off. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
3Manufacturing precision
If fleece belt guides are designed to match deflection radius, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The fleece belt guides are designed with specific geometric parameters (concentric adaptation to deflection radius, increasing distance from transverse belts) that optimize fiber guidance. By carefully selecting and adjusting these parameters, high guidance precision is achieved while avoiding excessive structural complexity
Data Source
Figure 1
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AI summary
The present invention relates to a tape forming unit (16) for a carding machine (1) with two transverse belts (20) for joining the nonwoven fabric, with at least one guide funnel (24) and a pair of pressure rollers (26), wherein the transverse belts (20) have opposite directions of movement and are arranged at a distance (C) from each other at their deflection points to the passage of the joined nonwoven fabric (18). Between the transverse belts (20) are nonwoven fabric guides (27, 28) for guiding the nonwoven fabric (18) to the guide funnel (24), wherein the nonwoven fabric guides (27, 28) provide guidance of the nonwoven fabric (18) to the guide funnel (24) perpendicular to the direction of movement of the transverse belts (20) and to the direction of movement (23) of the fiber nonwoven fabric (17).