Plastic Part Design: What Designers Need to Know About the Science of Color and Appearance
Most engineers and designers come from the metal world. Therefore, many of them make assumptions on the predicted performance of plastic properties based on their metals background.
Unlike metals, the knowledge of color and appearance is extremely important in the case of plastics. Most plastic parts have dual functions— physical performance and aesthetics. Aesthetics are important since very few of the parts need to be painted or otherwise decorated if designed and manufactured with due diligence.
On the other hand, even if we are designing the most aesthetically critical metal components such as exterior automotive parts, we mostly choose the metals and alloys based only on the physical properties, weight, and cost. The aesthetics are left to the paint specialist, who will in most cases find a paint system (primer, paint, and application method) that will meet the cost, durability, and cosmetic requirements. In other words, aesthetics and physical properties are quite independent of each other. A vast majority of metal parts meet their aesthetic and environmental requirements just by getting brushed, plated, chromate conversion coated or anodized.
Plastic parts not only need to meet the short-term color and appearance requirements, but also need to be resistant to long term color shift and fading.
This webinar is in two parts. In part one we discussed the appearance and color factors consisting of:
In part 2 we will discuss the fundamentals of color and appearance, specifications, measurement and tolerances.
The following topics will be discussed:
Observer, pigment and Light
Munsell system color – hue, value, and chroma
Hunter L, a, b system.
Delta E or E
Recommended E for plastics
Same color looking different under different lights
The Visible Spectrum
Common Light Sources
How gloss affects overall appearance
Gloss Level Measurement
How to measure and specify gloss
Specifying and Controlling Custom Colors
Proven techniques for color specification and control
Standardizing Viewing Conditions
Cosmetic Specifications of Injection Molded Parts Publication Number AQ-103
Putting It Altogether
|Title: How Poor Selection of Materials, Design, Tooling, and Design Errors Affect the Aesthetics of Plastic Parts and What Designers Need to Know About the Science of Color and Appearance|
|Date: Wednesday, Nov 20, 2019|
|Time: 11 AM EST|
|Duration: 60 minutes|
|About the Speaker|
Vikram Bhargava Global Engineering Consultant, Author and trainer
Vikram is a fellow of the Society of Plastics Engineers and past chairman of its product design and development division. He has over 40 years of experience in product design, development, manufacturing and management, especially in plastics..