Two-Shot Dispenser Part Moulding for Strong Impact Seams
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Solution Overview
Problem
Dispenser parts made from multiple plastic materials often suffer from distortion and weak seams, particularly at side edges, which can lead to cracking under impact forces, necessitating replacement.
Innovation Solution
A method involving two-component injection moulding where the first part is moulded in a single mould and then rotated for the second injection step, with raised contact surfaces or projections along the seam to enhance strength, using compatible resin materials and controlled temperatures to ensure a homogenous, strong seam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two components are injection moulded separately and then joined, then the dispenser part can be made from different plastic materials with different properties, but the seam becomes weak and prone to distortion and cracking
Solution Approach 1:
The patent merges two separate injection moulding processes into a single integrated tool that can mould both components in one operation. The tool includes first and second injection moulding means with respective cavities that form two components joined by a seam. This combining approach maintains seam strength while enabling different plastic materials to be used, resolving the contradiction between material versatility and seam strength.
2Ease of manufacture
If components are joined end-to-end with local reinforcements, then assembly is simplified, but the seam lacks sufficient strength to withstand impact forces
Solution Approach 1:
The patent applies local quality by providing specific reinforcement features at the seam location where strength is needed, rather than uniformly reinforcing the entire component. The reinforcement means are localized to the seam region to provide impact resistance while maintaining assembly simplicity elsewhere in the dispenser part.
3Ease of operation
If a transparent section is added to check consumable level, then product monitoring is improved, but the seam in that region becomes a weak point for cracking
Solution Approach 1:
The patent applies local quality by providing targeted reinforcement at the seam regions, particularly at side edges where cracking is most likely to occur. This localized reinforcement allows transparent sections to be included for level checking while preventing the seam from becoming a weak point, as the reinforcement means specifically strengthen vulnerable areas without affecting the transparent monitoring 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
The method produces dispenser parts with seams that match or exceed the impact strength of the individual components, preventing cracking along the seam and ensuring durability under impact.
Implementation Method 1
a first injection moulding step to form at least a first part
Implementation Method 2
the mould is then moved or rotated to a second position in which the second injection step and the subsequent cooling is performed
Data Source
Figure 1a~2
Figure 3~4d
Figure 5~6
AI summary
The invention relates to a method for manufacturing a dispenser part (20), such as a dispenser or a part of a dispenser, comprising at least two component parts (17, 18) joined by a seam (21) extending from a first side edge to a second side edge of the dispenser part. The method involves using a single mould and producing the dispenser part using a two component injection moulding process. The invention further relates to a dispenser or a dispenser part including at least two component parts joined by a seam achieved by the method, and a component part used in such a dispenser or dispenser part.