Tear-off Tape Helical Winding for Nonwoven Web Severing
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Solution Overview
Problem
Existing methods for winding nonwoven webs struggle with effectively severing and anchoring heavy, tear-resistant materials, often requiring mechanical or hydraulic cutting mechanisms, which can be inefficient and unreliable, especially when additives interfere with adhesion.
Innovation Solution
A method involving a tear-off tape placed crosswise to the machine direction, anchored to the winding core using a mechanical anchoring device, which enables helical winding and precise tearing of the nonwoven web, even with heavy materials, by utilizing an actuator to engage the tape with the core and initiate rotational winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical or hydraulic cutting mechanisms are used to sever heavy nonwoven webs, then the material can be cut, but the system becomes complex and unreliable when additives interfere with adhesion
Solution Approach 1:
The patent replaces complex mechanical or hydraulic cutting mechanisms with a simple tear-off tape system. The tear-off tape, when wound helically around the winding core, creates a tearing action that severs the nonwoven web without requiring complex cutting equipment. This substitution eliminates the reliability issues associated with additives interfering with adhesion in mechanical systems.
Solution Approach 2:
The tear-off tape acts as an intermediary element between the winding core and the nonwoven web. Instead of directly cutting the web with complex mechanisms, the tape is anchored to the core and used to tear the web through a winding action. This intermediary approach simplifies the system while maintaining effective severing of heavy materials.
2Productivity
If conventional cutting methods are used, then material severing is attempted, but the process becomes inefficient and unreliable for thick, tear-resistant materials
Solution Approach 1:
Instead of using complex cutting mechanisms to sever the web, the patent inverts the approach by using a simple tape winding action to create the severing effect. The tear-off tape is wound helically around the core, and the rotational motion of the core causes the tape to tear through the web, achieving efficient and reliable severing of thick, tear-resistant materials.
Solution Approach 2:
The patent changes the parameter of the severing mechanism from complex mechanical cutting to simple tape winding. By altering the method from direct cutting to helical winding with a tear-off tape, the system achieves improved productivity and reliability when handling thick, tear-resistant nonwoven materials.
3Manufacturing precision
If a tear-off tape system is implemented, then severing precision is improved, but the anchoring mechanism must be reliable for continuous production
Solution Approach 1:
The anchoring device is designed to be self-servicing, automatically anchoring the tear-off tape to the winding core without requiring complex external mechanisms. The actuator engages the tape with the core and initiates rotational winding, which inherently anchors the tape through the winding action itself, ensuring reliability for continuous production while maintaining simplicity.
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 solution allows for reliable and precise severing and anchoring of thick, tear-resistant nonwoven webs, avoiding the limitations of conventional cutting methods and ensuring continuous production without mechanical or hydraulic cutting mechanisms.
Implementation Method 1
an actuator associated with the winding roller for enabling a device carried by the winding core for anchoring the tear-off tape
Implementation Method 2
the rotation of the latter causes the helical winding of the tear-off tape and a consequent tearing or severing of the web-like material along a line that lies helically around the winding core
Data Source
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AI summary
A device is described for forming reels of web-like material around winding cores (10; 10X). To facilitate the tearing of the web-like material on completion of the winding process, one end of a tear-off tape (S) is attached to the winding core by means of an anchoring device (21). The tape is drawn from a crosswise guide 17 and wound in a helix around the winding core, thereby tearing off the web-like material.