Two-Step Injection Molding for Integral Plastic Faucet Members
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Solution Overview
Problem
Conventional methods for fabricating faucet members are inefficient, costly, and prone to quality issues due to complex processes, high material costs, and low structural strength, with copper casting being time-consuming and labor-intensive, and plastic injection molding facing mold-release problems and low bonding strength.
Innovation Solution
A two-step plastic injection molding process where a first part is molded and then positioned in a mold for a second injection to form a wrapped and bonded second part, creating a structurally strong integral faucet member with reduced labor and material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If copper casting process is used to fabricate faucet member, then product strength and durability are improved, but processing time increases excessively and production efficiency decreases
Solution Approach 1:
The patent replaces expensive copper material with plastic material for fabricating the faucet member. The plastic material, while having different properties than copper, provides sufficient strength for the application while enabling much faster production through injection molding processes, thus resolving the contradiction between strength and productivity.
Solution Approach 2:
The patent changes the material parameter from copper to plastic, which fundamentally alters the manufacturing process from casting and machining to injection molding. This parameter change enables mass production with higher efficiency while maintaining adequate product strength for faucet applications.
2Duration of action of stationary object
If copper casting process is used to fabricate faucet member, then product durability is improved, but manufacturing cost increases due to expensive material and machining
Solution Approach 1:
The patent substitutes expensive copper material with cheaper plastic material, directly reducing material costs. The injection molding process also eliminates expensive machining operations, further reducing manufacturing costs while producing durable faucet members suitable for their intended service life.
Solution Approach 2:
The patent replaces the mechanical casting and machining system with an injection molding system. This substitution eliminates complex machining steps, reduces tooling costs, and lowers overall manufacturing expenses while maintaining product durability through the inherent strength of properly designed plastic components.
3Productivity
If plastic injection molding is used to fabricate integral faucet member, then production efficiency is improved, but mold-release problem occurs in molding flow passage
Solution Approach 1:
The patent divides the faucet member into two separate parts: a first part containing the complex flow passage molded separately, and a second part containing the outer housing. This segmentation allows the first part to be molded without the mold-release problems that would occur if the entire assembly with internal passages were molded as one piece, while still achieving high production efficiency through subsequent bonding.
Solution Approach 2:
The patent employs a nested structure where the first part (with flow passage) is positioned within and bonded to the second part (outer housing). The first part is essentially nested inside the cavity formed by the second part, allowing complex internal geometries to be molded separately without mold-release issues while maintaining the appearance of an integral component.
4Ease of operation
If manual assembly with binder is used to join injection molded parts, then flexibility in assembly is improved, but bonding strength decreases and assembly quality cannot be guaranteed
Solution Approach 1:
The patent designs the bonding process to be self-aligning and self-securing. The first part is positioned in a predetermined location within the second part, and the bonding material automatically fills and secures the joint without requiring manual manipulation or skill-dependent operations. This ensures consistent bonding strength and assembly quality while maintaining the flexibility of the two-part construction.
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 process simplifies production, enhances product quality and structural strength, reduces transportation costs, and eliminates manual assembly uncertainties, resulting in improved efficiency and longer product life.
Implementation Method 1
a first plastic injection is used to mold a first part at a middle connecting part of a faucet member... a second plastic injection is used to mold a second part at two sides of the faucet member
Implementation Method 2
The second part may be properly integrally wrapped around and bonded to the first part in the second plastic injection molding
Data Source
AI summary
A process for fabricating an integral plastic faucet member and a finished product thereof are provided. The process mainly includes two injection steps. A first plastic injection is used to mold a first part at a middle connecting part of a faucet member. The first part is then placed into a mold for a second plastic injection so as to mold a second part at two sides of the faucet member. The second part is properly wrapped around and bonded to the first part. Meanwhile, desired holes are reserved to serve as water inlets, water outlets, and valve seats. Through such a two-injection process, the conventional complicated and time-consuming copper casting process is simplified, which improves the production efficiency and product quality, lows the cost and defective ratio. Meanwhile, the product weight is also reduced, which greatly reduces the transportation cost.