Vehicle Interior Panel Sealed Perforations
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Solution Overview
Problem
The introduction of a liquid foam precursor between layers in vehicle interior panels is problematic when one layer has perforations, as the liquid can flow through and make the foam layer visible from the decorative side, leading to undesirable visual defects.
Innovation Solution
A sealing film is applied continuously along the perforated region and extending into the non-perforated region of the skin layer to prevent the foam precursor from leaking through perforations, ensuring the foam layer remains hidden and maintaining the aesthetic integrity of the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a liquid foam precursor is introduced between layers with perforations, then the foam layer can be formed in place with good adhesive properties, but the liquid foam precursor flows through the perforations making the foam layer visible from the decorative side
Solution Approach 1:
A sealing film is introduced as an intermediary layer between the decorative skin layer and the foam precursor. This sealing film prevents the liquid foam precursor from flowing through the perforations while allowing the foam to expand and adhere to the skin layer, thus maintaining both the ease of manufacture and the visual appearance.
Solution Approach 2:
The sealing film is applied to the skin layer before introducing the foam precursor. This preliminary action seals the perforations in advance, preventing the foam precursor from leaking through during the subsequent foam formation process, thereby ensuring both manufacturing ease and visual precision.
2Ease of manufacture
If a sealing film is applied only at the location of stitching, then it seals the perforations locally, but it requires precise positioning and may not cover the entire perforated region
Solution Approach 1:
The sealing film is applied with varying dimensions: it extends beyond the perforated region into the non-perforated region. This local quality approach ensures complete coverage of all perforations while providing a margin of error in positioning, thus maintaining both ease of manufacture and reliable sealing coverage.
3Ease of manufacture
If the sealing film edges are parallel with the line of stitching, then the application is simple, but it creates wrinkles and thickness variations alongside the stitching
Solution Approach 1:
The sealing film is designed with asymmetric orientation relative to the stitching line. The edges of the sealing film are positioned at angles non-parallel to the stitching line, which prevents the film from wrinkling along the stitching and ensures a smooth surface appearance, thus maintaining both manufacturing simplicity and surface precision.
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 prevents visual defects by keeping the foam layer concealed, simplifies manufacturing, and reduces sensitivity to the positioning of the sealing film, allowing for a single-piece application that covers complex stitching patterns without wrinkles or thickness variations.
Implementation Method 1
The reaction results in volumetric expansion of the mixture and, finally, in a solid polymeric material with tiny gas voids distributed throughout the material—i.e., a foam material
Data Source
AI summary
A vehicle interior panel includes a foam layer formed from a liquid foam precursor between a substrate and a visible decorative skin layer that has perforations formed therethrough. In some cases, the perforations are associated with a line of stitching sewn into and through the skin layer. A sealing film is located beneath the skin layer in the perforated region to prevent the liquid foam precursor from leaking through the perforations during foam formation. The sealing film extends beyond the perforated region and into a non-perforated region, in some cases extending substantially over the entire back side of the skin layer. In this manner, the edges of the sealing film do not cause visual blemishes on the visible surface of the decorative skin layer over time.