Linear Element Cover for Nonwoven Web Transport
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Solution Overview
Problem
Existing devices for conveying nonwoven webs at high speeds face challenges in preventing web blowing and ensuring evenness, particularly due to complex mechanisms and high wear at deflection points, especially when using stationary cover strips.
Innovation Solution
A device featuring a transport device with a smooth, family of linear elements arranged above to cover the web, moving in the same direction as the web, which reduces friction and prevents blowing, while allowing air discharge, and is designed with narrow belts or wires spaced to guide the web gently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stationary cover strip is used to cover the web, then the web is protected from blowing and damage, but high relative speeds occur between the cover strip and the moving web causing heavy stress and increased wear
Solution Approach 1:
The cover strip is transformed from a stationary component to a moving component that travels with the web. The cover strip is guided over rollers and moves synchronously with the web transport, eliminating high relative speeds and reducing wear while maintaining web protection throughout the entire transport path.
Solution Approach 2:
The cover strip is divided into multiple sections that can be independently guided and tensioned. This segmentation allows each section to adapt to the web movement independently, reducing stress concentrations and enabling better control of the cover strip tension throughout its path.
2Reliability
If a circulating cover belt is used to cover the web, then the web is protected from smudging and damage, but the mechanical complexity and number of components increase significantly
Solution Approach 1:
The complex circulating belt mechanism is replaced by extracting only the essential protective function. Individual cover strips are used instead of a continuous circulating belt, eliminating the need for complex drive mechanisms, tensioning devices, and support rollers required for circulating belts.
Solution Approach 2:
Instead of using a moving cover belt that circulates around the web (complex solution), the patent uses a stationary web conveyor and applies moving cover strips that travel with the web (simplified solution). This inversion of the movement relationship simplifies the overall mechanism.
3Productivity
If high transport speeds are used for the web, then productivity increases, but the web becomes more susceptible to blowing and damage
Solution Approach 1:
The cover strip moves synchronously with the web at the same high speed, maintaining constant contact and protection throughout the transport path. This dynamic protection system enables high transport speeds without compromising web integrity, as the cover strip remains effectively attached to the web throughout its journey.
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
This configuration effectively prevents web damage and ensures even discharge at high speeds with reduced mechanical complexity and wear, allowing for efficient high-speed transport of nonwoven webs.
Implementation Method 1
the transport device has a rough surface and moves the web or nonwoven fabric lying on it due to frictional forces
Data Source
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AI summary
The device for conveying a carpet roll comprises a transport device (20) that serves as a support for the carpet roll and is driven by a drive in a transport direction (A) at a speed of at least 50 m/min. The transport device (20) has a rough surface and moves the carpet roll resting on it due to frictional forces. A set of linear elements (62) arranged above the transport device (20) serves to cover the carpet roll resting on the transport device (20). The linear elements (62) are smooth, and the carpet roll is moved along an underside of the linear elements (62). The linear elements (62) are arranged side by side but spaced apart from each other in a direction transverse to the transport direction (A).