Laminated Glass Interlayer Film Structure for Stable Roll Storage
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Solution Overview
Problem
Interlayer films for laminated glass can experience issues such as the winding core falling off the roll body during storage and the formation of creases due to uneven tension and thickness differences, particularly in wedge-like films.
Innovation Solution
The interlayer film is designed with a configuration that includes a first resin layer with a glass transition temperature below 15°C and a second resin layer with a temperature of 15°C or more, alternating layers in the thickness direction, and specific thickness ratios to maintain uniform tension and prevent core detachment and crease formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the interlayer film is stored vertically as a roll body, then storage space utilization is improved, but the winding core falls off the roll body
Solution Approach 1:
The patent applies preliminary action by forming a groove in the winding core before the interlayer film is wound around it. This groove structure is pre-designed to receive and retain the end of the interlayer film, preventing the winding core from falling off during vertical storage. The preventive structure is built in advance rather than reacting to the problem after it occurs.
2Adaptability or versatility
If the interlayer film has a wedge-like shape with thickness variation, then adaptability to different applications is improved, but creases form due to uneven tension during storage
Solution Approach 1:
The patent applies local quality by creating a specific groove structure at a particular location on the winding core (the end portion that receives the interlayer film). This localized structural modification addresses the tension distribution issue specifically where the film contacts the core, without affecting the overall wedge-like shape and thickness variation needed for application adaptability.
Solution Approach 2:
The patent changes the geometric parameter of the winding core by introducing a groove with specific dimensions (depth, width, and position). This parameter modification alters how the interlayer film is held and distributed during winding, preventing crease formation while preserving the wedge-like thickness profile of the film for its intended applications.
3Ease of operation
If the tension during winding is insufficient, then ease of winding operation is improved, but the winding core falls off the roll body
Solution Approach 1:
The patent applies self-service by designing the winding core with a groove that automatically retains the interlayer film end without requiring additional external forces or complex mechanisms. The groove structure itself provides the retention function, making the system self-sufficient and eliminating the need for high winding tension to prevent core detachment.
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 enhances the film's flexibility and prevents core detachment and crease formation, ensuring stable storage and improved sound insulation properties while maintaining handleability and reducing optical strain.
Implementation Method 1
a first resin layer having a glass transition temperature of less than 15° C.
Implementation Method 2
a second resin layer having a glass transition temperature of 15° C. or more
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of preventing a winding core from falling off a roll body of the interlayer film. The interlayer film for laminated glass according to the present invention includes one end and the other end being on an opposite side of the one end, the one end having a thickness of 1.05 mm or less, a first resin layer having a glass transition temperature of less than 15° C., a second resin layer having a glass transition temperature of 15° C. or more, and a region where a total number of laminated layers of the first resin layer and the second resin layer in a thickness direction is five or more, and in the region where the total number of laminated layers is five or more, the region has Y1/Z being 1.01 or more when a thickness by one layer of surface layers is denoted by Y1 μm and a thickness by one layer of layers neighboring the surface layers is denoted by Z μm.