Perpendicular Draw Lines in Asymmetric Laminated Glass

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Solution Overview

Problem

Conventional windshield manufacturing methods result in optical distortions due to parallel draw lines, which are minimized by aligning them, but perpendicularly arranged draw lines are known to cause severe distortions, rendering the windshield unusable.

Innovation Solution

A glass article design featuring a first outermost pane with a thickness of 1.6 to 2.5 mm and a second outermost pane with a thickness of 0.45 to 0.80 mm, both with draw lines oriented substantially perpendicularly to each other, bonded via a transparent interlayer, enhancing optical qualities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If draw lines of the first and second outermost panes are aligned parallel to minimize distortion, then optical quality is improved, but the design flexibility and manufacturing options are limited

Engineering Contradiction:

Improveoptical qualityVSAvoiddraw line arrangement flexibility

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The patent inverts the conventional approach by arranging draw lines perpendicularly instead of parallel. This counterintuitive solution, when combined with asymmetric thickness distribution (first pane 1.6-2.5mm, second pane 0.45-0.80mm), unexpectedly improves optical quality while providing manufacturing flexibility.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the thickness parameter of the glass panes to resolve the contradiction. By making the first outermost pane significantly thicker (1.6-2.5mm) than the second outermost pane (0.45-0.80mm), the system achieves superior optical quality with perpendicular draw lines, transforming a previously harmful configuration into a beneficial one.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If draw lines are arranged perpendicularly to increase design flexibility, then manufacturing options are expanded, but severe optical distortions occur rendering the windshield unusable

Engineering Contradiction:

Improvedraw line arrangement flexibilityVSAvoidoptical quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite glass article with asymmetric thickness distribution and perpendicular draw line orientation. This composite structure, combining different thicknesses and perpendicular orientations, produces unexpected synergistic effects that eliminate the harmful distortions typically associated with perpendicular draw lines.

Inventive Principle:

Principle #40Composite materials

3Productivity

If conventional float glass process is used to produce glass panes, then manufacturing efficiency is maintained, but optical distortions known as draw lines are introduced

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidoptical distortion

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent converts the harmful draw lines produced by the float glass process into a beneficial feature. By deliberately arranging draw lines perpendicularly and using asymmetric thickness, the previously harmful optical distortions are transformed into a configuration that delivers superior optical quality and enhanced manufacturing flexibility.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 glass article achieves excellent optical and strength properties, with reduced point light distortion, contrary to expectations, demonstrating superior optical performance.

Implementation Method 1

The first outermost pane is bonded to the second outermost pane via the transparent interlayer

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentEP3575271B1Glass article having perpendicular draw lines

Publication Date: 2020.12.16 AGC AUTOMOTIVE AMERICAS CO

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AI summary

A glass article has substantially perpendicular draw lines and includes a first outermost pane having a thickness of from 1.1 to 4.0 mm. The glass article also includes a second outermost pane disposed opposite the first outermost pane and having a thickness of from 0.3 to 1.05 mm. The glass article further includes a transparent interlayer disposed between the first and second outermost panes. Each of the first outermost pane and the second outermost pane independently has a length and includes draw lines that extend along the length. The first outermost pane is bonded to the second outermost pane via the transparent interlayer such that the draw lines of the first outermost pane are disposed substantially perpendicularly to the draw lines of the second outermost pane.