Textured Screen-Printed Laminates for Automotive Interiors
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Solution Overview
Problem
Existing methods for creating textured surfaces on automotive interior laminates either require adjusting the chemistry of the surface layers or resort to complex processes, limiting the ability to produce high or low gloss finishes with sufficient texture and stability for thermoforming and molding.
Innovation Solution
A multi-layer laminate with a thin, flexible polymeric base layer and a layer of screen-printed ink material containing a resinous binder, hardener, and fine particulate filler, which forms discrete segments that provide a stable, heat-resistant textured surface capable of maintaining height and hardness during thermoforming and molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the chemistry of the surface layer is adjusted to produce a textured finish, then a low gloss surface can be achieved, but the process becomes complex and limits the ability to produce high gloss finishes with sufficient texture
Solution Approach 1:
The textured surface is created by applying discrete ink segments in a pattern rather than modifying the entire surface layer chemistry. This segmentation allows the base layer to maintain its original chemical composition and gloss properties while the ink segments provide the textured effect.
Solution Approach 2:
An ink material serving as an intermediary layer is applied to the surface to create texture without chemically modifying the base layer. This intermediary approach allows both high and low gloss finishes to maintain their original properties while gaining textured functionality through the screen-printed ink segments.
2Shape
If a textured material is applied to the laminate surface, then a textured decorative finish is achieved, but the texture may not withstand subsequent thermoforming and molding processes
Solution Approach 1:
The ink material formulation parameters are specifically adjusted to achieve optimal balance between texture height and hardness. The ink contains resinous binders, hardeners, and fine particulate fillers in controlled proportions to ensure the texture withstands thermoforming and molding while maintaining decorative quality.
Solution Approach 2:
The ink material is formulated as a composite containing resinous binders, hardeners, and fine particulate fillers. This composite structure provides both the desired textured appearance and the mechanical stability required to withstand subsequent manufacturing processes like thermoforming and molding.
3Shape
If a highly textured surface is produced, then decorative appearance is improved, but the texture height may deform during thermoforming and molding
Solution Approach 1:
The ink formulation parameters are optimized to achieve the right balance between texture height for decorative effect and hardness to prevent deformation. The resinous binder-to-hardener ratio and filler content are controlled to ensure print height maintenance during thermoforming and molding while preserving the textured appearance.
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 solution allows for the creation of both high and low gloss laminates with a more highly textured surface that meets automotive specifications, maintaining print height and hardness through subsequent thermoforming and molding processes, ensuring durability and aesthetic requirements.
Implementation Method 1
The ink material is pressed through a screen onto the polymeric base layer. The screen has open areas that allow passage of the ink material so as to form a print pattern
Implementation Method 2
The print pattern of ink material is then dried and cured on the base layer
Implementation Method 3
The ink material contains a resinous binder, a hardener and a fine particulate filler. The ink segments are dried on the base layer to a height and a hardness sufficient to form a stable, heat-resistant textured surface
Data Source
AI summary
A multi-layer laminate having a textured surface comprises a thin, flexible, thermoformable polymeric base layer, and a layer of spaced part segments of an ink material screen printed in a pattern on a surface of the polymeric base material. The ink material comprises a UV curable screen printing ink which contains a resinous binder, a hardener, and a fine particulate filler. The ink is pressed through a screen having an emulsion with a thickness from about 40 to 50 microns. The ink segments are dried on the base layer by UV curing to a height and a hardness sufficient to form a heat stable textured surface adhered to the base layer. In one embodiment, the printed ink layer has a print height from about 25 to about 50 microns and resists deformation from subsequent thermoforming and/or injection molding. The ink segments meet automotive hardness and abrasion specification requirements.