Glass Ribbon Edge Separation via Scoring and Stabilizing Rollers
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Solution Overview
Problem
Existing glass manufacturing methods face challenges in separating edge portions from a glass ribbon without inducing excessive bending stress, which can lead to vibrations, warping, and twisting, resulting in defects in the glass ribbon.
Innovation Solution
A glass manufacturing apparatus comprising a forming body and an edge separation assembly that includes a scoring device to create a score in the glass ribbon, a separation roller to apply a force and separate the edge portion, and stabilizing rollers to maintain the glass ribbon's position during the scoring process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If edge portions are separated using traditional handling apparatus by bending the glass ribbon, then edge portions can be removed from the glass ribbon, but excessive bending stress and uneven bending stress are generated causing vibrations, warping, and twisting that propagate defects into the glass ribbon
Solution Approach 1:
The scoring device creates a score line in the glass ribbon at the desired separation location before the separation process. This preliminary action defines the exact separation path, ensuring that when the edge portion is later removed, it separates cleanly along the pre-scored line without causing warping or twisting that would propagate defects into the main glass ribbon body.
Solution Approach 2:
The edge separation assembly extracts the problematic edge portions from the glass ribbon through a controlled process. The separation roller applies force to bend the glass ribbon along the pre-scored line, and the guide roller directs the separated edge portion away from the main ribbon, effectively removing the edge portions without allowing stress-induced defects to propagate into the central glass ribbon.
2Productivity
If edge portions are separated after glass sheet formation, then downstream finishing processes can handle edge removal, but defects caused by bending stress have already been frozen into the glass ribbon during formation
Solution Approach 1:
The edge separation assembly performs edge portion removal as a preliminary action during the glass ribbon formation process itself, before the glass sheet is completely formed and defects can be frozen in. By scoring and separating edge portions in real-time during ribbon drawing, the system prevents stress-induced defects from propagating into the final product while maintaining continuous production efficiency.
Solution Approach 2:
The scoring device acts as an intermediary element that facilitates clean separation. By creating a score line that penetrates through the glass ribbon thickness, it provides a predetermined weak plane that allows edge portions to be removed with minimal stress application, preventing the propagation of vibrations and warping that would otherwise contaminate the main glass ribbon during the formation process.
3Manufacturing precision
If a scoring device is introduced to create scores in the glass ribbon, then edge portions can be separated more cleanly, but the device complexity increases with additional components
Solution Approach 1:
The edge separation assembly integrates multiple functions into a compact unit: the scoring device creates the separation line, the separation roller applies bending force along the score, and the guide roller directs the separated edge portion. This multi-functional integration achieves clean separation while minimizing overall device complexity by combining these operations in a single coordinated assembly rather than separate steps.
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 apparatus effectively reduces bending stress and defects in the glass ribbon by separating edge portions before they reach the downstream finishing processes, ensuring a more stable and uniform glass sheet production.
Implementation Method 1
a scoring device positioned below the forming body and configured to form a first score in the glass ribbon along a length of the glass ribbon in the draw direction
Implementation Method 2
a separation roller positioned downstream of the scoring device and configured to apply a force to an edge portion of the glass ribbon outboard of the first score and separate the edge portion from a central portion of the glass ribbon
Implementation Method 3
a pair of stabilizing rollers positioned proximate the separation roller and arranged to pinch a central portion of the glass ribbon inboard of the first score between the pair of stabilizing rollers
Data Source
AI summary
A glass manufacturing apparatus including a forming apparatus, the forming apparatus including an edge separation assembly. The edge separation assembly includes a scoring device with a scoring tool coupled thereto, a backing roller, a pair of stabilizing rollers configured to pinch a central portion of the glass ribbon therebetween, and a separation roller configured to apply a separation force against an edge portion of the glass ribbon to separate the edge portion from the central portion. The edge separation apparatus may further include a first plurality of guide rollers arranged to direct the separated edge portion away from the central portion and a second plurality of guide rollers configured to guide the central portion. The forming apparatus further includes a cross-cut assembly configured to separate a glass sheet from the central portion.