Embossed Bonding Film Surface Control for Laminated Glass

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Solution Overview

Problem

Existing films for bonding in laminated glass or light transmitting laminates face challenges in achieving optimal deairing stability and edge sealing characteristics without compromising optical properties, often resulting in interference patterns or bubbles due to embossed surfaces.

Innovation Solution

A film with an embossed surface having specific Sku, Sk, Spk, and Svk values, and a polyvinyl acetal resin with a plasticizer, where the embossed surface has a transferring ratio of 0.70 or more, and can include a wedge shape, ensuring excellent deairing and edge sealing performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If an embossed film for bonding is used in lamination, then deairing property and workability are improved, but interference patterns or bubbles are generated and visibility decreases

Engineering Contradiction:

Improvedeairing propertyVSAvoidinterference pattern and bubble

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The embossed surface is designed with specific local characteristics: Sku value of 5 or less, Sz value of 30 to 90 μm, and controlled Sk, Spk, and Svk values. These localized surface properties enable effective deairing while minimizing interference patterns and bubble formation, resolving the contradiction between deairing performance and optical quality.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If an embossed film for bonding is used in lamination, then workability of overlapping interlayer on glass plate is improved, but dazzle occurs and visibility decreases

Engineering Contradiction:

ImproveworkabilityVSAvoiddazzle

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The embossed surface parameters are precisely controlled: Sku value of 5 or less, Sz value of 30 to 90 μm, and the sum of Sk and Spk values constitutes 50% or more of the total. These parameter modifications maintain excellent workability for overlapping interlayers on glass plates while preventing dazzle and preserving visibility.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If embossed dots are disposed on both surfaces of the film, then deairing property is improved, but interference pattern is generated and visibility decreases

Engineering Contradiction:

Improvedeairing propertyVSAvoidinterference pattern

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

Both surfaces of the film are equipped with embossed dots having specific local qualities: Sku value of 5 or less, Sz value of 30 to 90 μm, and controlled Sk, Spk, and Svk values. This localized surface engineering improves deairing property while minimizing interference patterns and maintaining manufacturing precision.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11597182B2Laminating film and light-transmitting laminate including same

Publication Date: 2023.03.07 MICROWORKS CO LTD

AI summary

The present disclosure relates to a film for bonding including an embossed surface, wherein the embossed surface has a Sku value of 5 or less, wherein the embossed surface has Sk, Spk, and Svk values, and when a total sum of the Sk value, the Spk value, and the Svk value is 100%, a sum of the Sk value and the Spk value is 50% or more, wherein the embossed surface has a Sz value of 30 to 90 μm, and wherein the film includes a polyvinyl acetal resin and a plasticizer.