Diffractive Mold Insert for Curved Plastic Molding
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Solution Overview
Problem
Current methods for producing plastic molded parts with optical effects, such as diffractive lenses, are limited in their ability to integrate diffractive microstructures into curved surfaces without modifying the component's shape and require significant changes to existing injection molding tools, restricting design flexibility and increasing costs.
Innovation Solution
A method involving a mold insert with a diffractive surface relief that can be inserted into an injection mold to form a partial area of the cavity, allowing for the production of plastic molded parts with diffractive optical elements that can serve decorative, security, or other optical functions, without necessitating changes to the component's shape or existing tools, using a mold insert with a diffractive microstructure and macrostructure that can be easily integrated into curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If diffractive microstructures are integrated into curved surfaces by modifying the component shape, then optical effects can be achieved, but design flexibility is restricted and manufacturing complexity increases
Solution Approach 1:
The injection mold is divided into separate components: the main mold body and a detachable mold insert containing the diffractive microstructure. This segmentation allows the mold insert to be independently manufactured and replaced, enabling integration of diffractive structures without modifying the entire mold or component shape, thus maintaining design flexibility while facilitating ease of manufacture.
Solution Approach 2:
A mold insert serves as an intermediary element that bridges the main mold body and the diffractive microstructure. The insert can be easily inserted into and removed from the injection mold, allowing for flexible integration and replacement of diffractive structures without affecting the overall mold design or component geometry.
2Manufacturing precision
If existing injection molding tools are significantly modified to produce diffractive optical elements, then optical effects can be achieved, but manufacturing costs increase
Solution Approach 1:
The diffractive microstructure is isolated in a separate mold insert rather than being integrated into the main mold body. This allows the insert to be manufactured with high precision using specialized techniques while the main mold remains unchanged, reducing overall manufacturing costs and simplifying tooling modifications.
Solution Approach 2:
The mold insert can be manufactured as a relatively simple, replaceable component compared to modifying the entire injection mold. If the diffractive structure needs to be changed or updated, only the insert needs to be replaced rather than reworking the entire mold, reducing long-term manufacturing costs and increasing adaptability.
3Illumination intensity
If diffractive surface relief covers the entire surface area, then optical effects are maximized, but other functional areas and decorative options are reduced
Solution Approach 1:
The diffractive microstructure is applied locally to specific areas of the mold insert rather than covering the entire surface. This allows different regions of the molded component to have different properties: areas with the diffractive insert receive the optical effect, while other areas remain smooth or receive different treatments for decorative or functional purposes, maximizing both optical effectiveness and design versatility.
Solution Approach 2:
The mold insert itself can be segmented to contain diffractive structures only in specific zones, allowing the injection mold to produce components with localized optical effects. This segmentation enables combination of diffractive elements with other features such as decorative surfaces, structural elements, or additional functional coatings in different areas of the same component.
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 the production of plastic molded parts with diffractive surface reliefs that offer design flexibility, stability, and cost-effective integration of optical effects into existing components, allowing for various applications including lighting devices and backlit switches, without compromising the component's shape or stability.
Implementation Method 1
a mold insert with a diffractive surface relief is provided, the mold insert is inserted into one mold half of an injection mold
Data Source
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AI summary
Method for producing a plastics moulding (1), wherein in the method a mould insert (3) having a diffractive surface relief (32) is provided, the mould insert (3) is inserted into a mould half of an injection mould (5), said mould half, together with at least one further mould half, forming a cavity for producing the plastics moulding (1), wherein the mould insert (3) is inserted into the injection mould (5) such that the diffractive surface relief (32) forms a subregion of the surface, formed by the mould half (5), of the cavity, and the plastics moulding (1) is moulded by injection-moulding by means of the injection mould (5). The invention furthermore relates to a mould insert and to an injection mould for such a method, and also to a plastics moulding produced in such a way.