Molding Tool for Seamless Decorative Foil Integration
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Solution Overview
Problem
Current methods for producing molded parts with multiple adjoining decorative areas for motor vehicle interiors require multiple processing steps, edge trimming, and additional tools, leading to inefficiencies and visual imperfections in the transition between decorative areas.
Innovation Solution
A molding tool with a core and slide mechanism that allows for the integration and rear molding of decorative films without additional edge processing, using a slide that separates sub-areas and positions decorative films for thermoplastic injection, creating a seamless connection between decorative areas during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate parts with different surface structures are prefabricated and connected together, then different decorative areas can be achieved, but several processing steps and transport processes are required leading to considerable expenditure of time and manufacturing technology
Solution Approach 1:
The patent combines multiple decorative areas into a single molding process by integrating different decorative foils (fabric, leather, plastic) into one mold cavity. The mold allows simultaneous formation of multiple decorative regions without requiring separate processing steps for each decorative area, thereby eliminating transport processes and reducing manufacturing time while maintaining versatility of decorative options.
Solution Approach 2:
The patent applies preliminary action by pre-positioning multiple decorative foils into the mold cavity before the actual molding process. The foils are arranged and secured in their respective positions beforehand, allowing the thermoplastic material to be injected and bonded to the pre-positioned decorative elements in a single operation, thus eliminating subsequent assembly steps.
2Manufacturing precision
If edge area of decorative element is trimmed separately before final completion, then perfect fit and visual design can be achieved, but additional processing steps and tools are required
Solution Approach 1:
The patent merges the edge trimming function into the main molding process by designing the mold cavity to automatically define and trim the edges of decorative elements during the molding operation itself. The mold walls act as the trimming boundary, eliminating the need for separate trimming tools and operations while maintaining precise edge definition.
Solution Approach 2:
The molding process performs self-service by automatically trimming and defining the edges of decorative elements through the mold cavity geometry. The thermoplastic material is injected in a way that naturally bonds to the decorative foils and is trimmed by the mold walls, allowing the process to define its own boundaries without external intervention or additional tools.
3Device complexity
If punching tool is directly engaged in molding tool, then tool changing is avoided, but risk of damage to molding tool increases
Solution Approach 1:
The patent extracts the punching function from a separate punching tool and integrates it into the molding tool itself by designing the mold cavity with built-in punching or trimming capabilities. The mold includes features such as punching pins or trimming edges that are part of the molding tool structure, allowing the decorative elements to be punched or trimmed during the molding process without requiring external punching tools, thus avoiding tool changing while protecting the molding tool from damage.
4Ease of manufacture
If adjacent parts of outer skin overlap in sealing manner, then common support structure can be used, but strong visual delimitation between surfaces occurs at transition area
Solution Approach 1:
The patent applies local quality by using different material properties and bonding methods in different regions of the mold. The thermoplastic material is injected to create different bonding characteristics at the transition areas between decorative foils, allowing the edges to be trimmed and bonded seamlessly. The local application of heat, pressure, and material flow control creates smooth transitions without visible delimitation lines, while the overall structure maintains a common support framework.
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
This method eliminates the need for edge trimming and additional processing steps, achieving a clean, precise, and visually perfect transition between decorative areas, reducing manufacturing time and complexity while ensuring a flawless finish.
Implementation Method 1
The method provides for the edge area of the decorative element to be formed from a thermoplastic material that is injected into the molding tool and bonds to the decorative foil in the area of the edge area of the decorative element
Data Source
Figure 1
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AI summary
The method involves overmolding a decorative foil (9) in a cavity with a thermoplastic material, at a core side in a closed molding tool (1). Separation between a decorative area and another cavity is compensated. Another decorative foil (16) is subsequently overmolded in the latter cavity with a thermoplastic material. The materials are bonded with each other. A composite molded part is formed with different conjoined decorative areas. The foils are made of fabric, plastic foil, decorative material, rug material, leather or imitation leather. An independent claim is also included for a molding tool comprising a core and a matrix.