Friction Disc Grooves for False Twist Texturing
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Solution Overview
Problem
Friction disks made of hard materials for false twist devices cause excessive abrasion and stress on threads, leading to a shortened lifespan and the 'glacing effect' where the surface becomes smeared, while soft material disks are gentler but have a shorter service life.
Innovation Solution
Incorporating recesses, such as grooves, on the friction surface of the disk to reduce the contact area and distribute abrasion, thereby reducing the risk of surface smearing and end breaks, and using a material like oxide ceramic for durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If friction discs made of hard material such as ceramic or metal are used, then service life is extended (over seven years), but thread abrasion and stress increase, leading to the glacing effect where the surface becomes smeared and smoothed
Solution Approach 1:
The friction surface is segmented by introducing circumferential grooves that divide the continuous surface into multiple separate friction zones. This segmentation prevents the accumulation and smearing of abrasion deposits across the entire surface, thereby reducing the glacing effect while maintaining the durability of hard materials.
Solution Approach 2:
The grooves create local variations in the friction surface, concentrating abrasion deposits into specific groove areas rather than distributing them uniformly. This local concentration prevents the overall smearing of the friction surface, maintaining effective friction contact areas while allowing controlled deposit accumulation in groove regions.
2Object-affected harmful factors
If friction discs made of soft material such as polyurethane are used, then thread gentleness is improved, but service life is reduced to around 8 to 9 months
Solution Approach 1:
The invention combines hard friction disc material with a groove structure that mimics the beneficial effects of soft materials. The hard material provides durability while the groove configuration reduces abrasion-induced smearing, achieving a composite effect that delivers both thread gentleness and extended service life.
3Object-affected harmful factors
If the friction surface area is reduced by adding grooves, then the risk of glacing effect is reduced, but the actual friction area decreases from 9 mm to 6 mm with two grooves
Solution Approach 1:
By segmenting the friction surface into multiple zones separated by grooves, the invention maintains sufficient total friction area while preventing the harmful accumulation of abrasion deposits. The segmented structure ensures that each friction zone remains effective without contributing to overall surface smearing.
Solution Approach 2:
The grooves act as receptacles that capture and contain abrasion deposits, effectively discarding them from the active friction surfaces. This prevents the deposits from spreading and smearing the friction areas, maintaining their effectiveness despite the reduced total friction surface area.
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 grooved friction disk maintains a consistent thread tension and reduces end breaks, offering a longer service life comparable to hard material disks while being gentler on threads, suitable for high texturing speeds and microfilaments.
Implementation Method 1
the thread runs over the friction surface of the friction disk... produce a false twist on the multifilament threads by friction
Data Source
Figure 1~2
AI summary
Friction discs made from a hard material such as ceramic or metal as a rule generate wear and thus damage the threads more than, for example, soft friction discs made from polyurethane which undergo wear by the threads. Whilst friction discs made of hard material can be used as a rule for more than seven years, friction discs made from polyurethane must be changed after just 8 to 9 months. According to the invention, friction discs (1) thus have at least one friction area reducing groove on the friction surface (4) thereof.