Multi-Shot Injection Molding for Decorative Polymeric Components

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Solution Overview

Problem

Conventional methods for producing decorative plastic components with both metallized and non-metallized surface finishes require multiple processing steps, leading to potential corrosion, degradation, and aesthetic issues due to gaps and seams in multi-part assemblies, which compromise durability and corrosion resistance.

Innovation Solution

A method involving multi-shot injection molding to integrate a metal-platable polymer with a polymer resistant to metallization, forming a single component with concealed interface regions, allowing for simultaneous metallization of one surface and maintaining a non-metallized, colored surface finish, thereby eliminating the need for separate processing steps and reducing susceptibility to corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate components are molded and assembled to achieve multiple surface finishes, then manufacturing flexibility is improved, but assembly complexity and corrosion risk increase

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidassembly complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple surface finishes (metallized and non-metallized) into a single integrally molded polymeric component. The multi-shot injection molding process deposits different polymer materials with distinct surface properties onto different regions of the same component, eliminating the need to assemble separate components and thereby reducing assembly complexity while maintaining manufacturing flexibility.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If separate components are assembled to achieve multiple surface finishes, then manufacturing flexibility is improved, but durability and corrosion resistance deteriorate

Engineering Contradiction:

Improvemanufacturing flexibilityVSAvoidcorrosion resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent creates a single integral component with multiple surface finishes through multi-shot injection molding, eliminating seams and joints between separate parts. This integrated structure prevents corrosive agents from penetrating between components, thereby improving corrosion resistance and durability while still allowing different surface finishes to be applied to different regions.

Inventive Principle:

Principle #5Merging (Combining)

3Device complexity

If multi-shot injection molding is used to integrate polymers, then assembly complexity is reduced, but manufacturing precision requirements increase

Engineering Contradiction:

Improveassembly complexityVSAvoidinterface region precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent uses multi-shot injection molding where the first polymer is molded and then the second polymer is deposited onto specific regions of the first polymer while it is still in the mold. This sequential process with concealed interface regions allows for precise control of the boundary between different surface finishes, achieving high manufacturing precision without requiring complex post-assembly operations.

Inventive Principle:

Principle #10Preliminary action

4Ease of manufacture

If conventional multi-step processing is used, then manufacturing simplicity is maintained, but productivity and energy efficiency deteriorate

Engineering Contradiction:

Improveprocess simplicityVSAvoidmanufacturing efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent integrates multiple processing steps (molding of different polymers, surface finish application) into a single multi-shot injection molding operation. By combining these steps that would traditionally be performed separately into one continuous process, the patent improves productivity and energy efficiency while maintaining ease of manufacture through automated in-mold processing.

Inventive Principle:

Principle #5Merging (Combining)

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 method enhances the durability and corrosion resistance of decorative components by eliminating seams and ensuring consistent aesthetics, while simplifying the manufacturing process and reducing material and energy requirements.

Implementation Method 1

multi-shot injection molding of a first resin and a second resin. The first resin forms a first polymer that is metal-platable, while the second resin forms a second polymer that is resistant to metallization

Methodology Applied

Scientific EffectInjection molding:

Implementation Method 2

metallizing one or more regions of the first polymer

Methodology Applied

Scientific EffectMetal plating: Electroplating

Data Source

PatentUS9062386B2Methods of multi-shot injection molding and metal-plated polymeric articles made therefrom

Publication Date: 2015.06.23 RESRG AUTOMOTIVE LLC

AI summary

Molded metallized polymeric components are formed by methods of multi-shot injection molding of a first resin and a second resin, where the first resin forms a first polymer that is metal-platable and the second resin forms a second polymer that is colored and resistant to metallization. Select regions corresponding to the metal-platable polymer surface are metallized. Further, one or more interface regions between the first metal-platable polymer and the second colored polymer can be concealed from a visible direction. Molded decorative polymeric components formed from such methods are also provided.