Two-Component Injection Molding Dual Gating for Tip Penetration
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Solution Overview
Problem
Existing two-component injection-molding techniques struggle to produce injection-molded parts where both material components are visible on the outer side, particularly in products like interdental brushes, as the second material component often fails to penetrate the narrow tip areas, leading to softness and bending issues.
Innovation Solution
The method involves injecting the first material component into a partial region of the mold cavity through a first gating point and the second material component through a second gating point, allowing the second material component to displace the first component into peripheral regions and remain visible in certain areas, while also forming a core within the first material component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first material component is injected into the entire mold cavity and the second material component is injected to form a core, then the second material component forms an inner core structure, but the second material component cannot penetrate into narrow tip areas and remains completely hidden within the first material component
Solution Approach 1:
The mold cavity is divided into multiple gating regions, with the first gating point positioned to allow the second material component to penetrate into narrow tip areas while the second gating point forms the core structure. This segmentation enables precise control over material distribution and visibility of both components.
Solution Approach 2:
Different regions of the mold cavity are assigned different material components based on local requirements. The second material component is strategically introduced at the first gating point to ensure penetration into narrow tip areas where core support is needed, while remaining visible in specific regions, and forming a core structure through the second gating point.
2Strength
If the second material component is injected to form a complete core, then structural stability is improved, but the second material component remains completely hidden within the first material component and cannot be visible in certain regions
Solution Approach 1:
The gating system is segmented into two separate gating points: the first gating point allows the second material component to be visible in specific regions and penetrate narrow tip areas, while the second gating point forms the core structure. This enables both visibility and structural stability to be achieved simultaneously.
Solution Approach 2:
The problem is solved by introducing a spatial dimension through multiple gating points positioned at different locations and orientations. This allows the second material component to fulfill multiple functions (visibility, tip penetration, core formation) that cannot be achieved from a single gating point.
3Ease of manufacture
If the first material component is displaced into peripheral regions by the second material component, then the second material component forms a core structure, but the second material component fails to penetrate narrow tip areas and remains hidden
Solution Approach 1:
The gating system is divided into two separate gating points: the first gating point is specifically positioned to enable the second material component to penetrate narrow tip areas, while the second gating point facilitates core structure formation through displacement of the first material component into peripheral regions.
Solution Approach 2:
The second material component is introduced at the first gating point before or during the displacement process, ensuring that narrow tip areas are filled with the appropriate material before the main core formation process occurs. This preliminary action ensures reliable material penetration in critical tip regions.
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 approach ensures that both material components are visible on the outer side of the injection-molded part, providing enhanced stability and functionality, such as in interdental cleaners, where the second material component forms a core to prevent bending and the first material component forms a soft cleaning area.
Implementation Method 1
a first material component is injected into a mold cavity of an injection mold and is displaced into peripheral regions of the mold cavity by injecting a second material component
Implementation Method 2
Due to the cooling down of the first material component on the outer wall, the second material component only flows in the core region of the mold
Data Source
AI summary
A method for producing injection-molded parts by a two-component injection-molding technique in which a first material component is injected into a mold cavity and is displaced into peripheral regions of the mold cavity by injecting a second material component. The first material component is injected into a partial region of the mold cavity at a first gating point and the second material component is injected into the mold cavity at a second gating point and, as a result, the first material component is acted upon by the second material component and displaced in the direction of the regions of the mold to be filled with the first material component. The first material component is thereby displaced into regions of the mold at the wall, and the second material component is introduced in those regions of the mold as a core material and completely into other regions of the mold.