Multi-Stage Plastic Decoration for Complex Geometries

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Solution Overview

Problem

Existing methods for decorating plastic parts, such as IMD and hot stamping, are limited by geometry restrictions, preventing reliable decoration of complex or difficult shapes, especially those with small edge or corner radii and deep decoration depths.

Innovation Solution

A method involving a plastic intermediate product with a first decorative ply, followed by hot stamping with a second decorative ply on a second stamping film, allowing decoration of complex geometries with seamless transitions and deeper decoration depths, including edges and corners with radii smaller than 0.3 mm, and cylindrical surfaces with up to 10° conicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If IMD method is used to decorate plastic parts, then surface decoration quality is improved, but geometry restrictions worsen (cannot decorate complex shapes with small radii)

Engineering Contradiction:

Improvesurface decoration qualityVSAvoidgeometry adaptability

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The decoration process is divided into two independent stages: first IMD for areas requiring high precision, then hot stamping for complex geometry areas. This segmentation allows each method to be applied where it is most effective, resolving the contradiction between decoration quality and geometry adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different decoration methods are applied to different regions of the plastic part based on local geometric characteristics. The first decorative ply is applied to regions suitable for IMD, while the second decorative ply is applied to regions with complex geometry using hot stamping, optimizing both quality and adaptability locally.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If hot stamping is used to decorate shaped parts, then geometry adaptability is improved, but decoration quality worsens (cannot achieve seamless transitions and deep decoration)

Engineering Contradiction:

Improvegeometry adaptabilityVSAvoiddecoration quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The part surface is segmented into zones where hot stamping is applied first to complex geometry areas, followed by IMD on areas requiring higher decoration quality. This sequential application resolves the quality limitation of hot stamping while maintaining its geometry adaptability advantage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Hot stamping is applied locally to regions with complex geometry where it excels, while IMD is applied locally to regions where high decoration quality is critical. This local optimization allows the composite method to overcome the quality limitations of hot stamping alone.

Inventive Principle:

Principle #3Local quality

3Productivity

If single decorative ply is applied, then production efficiency is improved, but decoration depth capability worsens (cannot achieve deep decoration on complex geometries)

Engineering Contradiction:

Improveproduction efficiencyVSAvoiddecoration depth

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The decoration is segmented into two plies applied in sequence: the first decorative ply handles areas requiring deep decoration, while the second decorative ply completes the decoration on remaining areas. This segmentation enables deep decoration capability while maintaining production efficiency through a streamlined two-step process.

Inventive Principle:

Principle #1Segmentation

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

Enables high-quality decoration of previously difficult-to-decorate shapes with seamless transitions, overcoming geometry limitations and achieving uniform optical effects, while maintaining the thickness and appearance of the injection-molded part.

Implementation Method 1

a decoration, in particular at least a part of at least one decorative ply, is transferred from a carrier ply to a surface to be stamped by means of a heated stamp or a wheel which exerts pressure on the carrier ply over a particular period of time

Methodology Applied

Scientific EffectHeat transfer: Conduction (thermal)

Implementation Method 2

the film is back injection molded with a molten plastic, wherein the decorative ply bonds to the molten plastic under pressure and temperature to form a secure join

Methodology Applied

Scientific EffectPressure bonding: Pressure Increase

Data Source

PatentUS11628605B2Method for producing a shaped plastic part having a decorated surface

Publication Date: 2023.04.18 LEONHARD KURZ STIFTUNG & CO KG

AI summary

A method for producing a shaped plastic part having a decorated surface, having the steps of:providing a plastic intermediate product having an injection-molded part and at least a first decorative ply of a first stamping filmproviding a second stamping film with a second decorative ply,hot stamping the second stamping film onto the plastic intermediate product and/or onto the injection-molded part.A shaped plastic part including an injection-molded part with at least a first and a second region of surface, a first decorative ply and a second decorative ply, wherein the first decorative ply is arranged at least in the first region of surface and the second decorative ply is arranged at least in the second region of surface.