Plastic Screw Cap Separate Injection Molding Ultrasonic Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional screw closures for large containers, such as 5-gallon containers, are difficult to manufacture due to the need for complex and expensive injection molding tools that require cavities open in opposite directions with undercut configurations, making production costly and complicated.
Innovation Solution
The outer shell and removal sleeve are produced separately by injection molding and then fixedly connected via welding or gluing, allowing for the use of standard molding tools and avoiding the need for complex molds, with energy direction means like triangular ribs aiding in the welding process for a strong and sealed connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer shell and removal sleeve are produced as a single integrated component using conventional injection molding, then the closure structure is complete and functional, but the manufacturing process becomes complex and expensive due to requirements for multi-directional cavities and undercut configurations
Solution Approach 1:
The closure is divided into two separate components: an outer shell and an removal sleeve. Each component can be manufactured independently using standard injection molding tools, avoiding the need for complex multi-cavity molds. The components are then joined together through ultrasonic welding or adhesive bonding, simplifying the overall manufacturing process while maintaining structural integrity.
Solution Approach 2:
The removal sleeve is designed to be inserted into and nested within the outer shell. This nested configuration allows both components to be produced separately using simple molds, then assembled together. The inner sleeve fits concentrically within the outer shell, creating a compact two-part structure that avoids the complexity of integrated molding.
2Ease of manufacture
If the closure components are produced separately and then joined together, then manufacturing costs are reduced and production is simplified, but the joint connection must withstand high forces and torque
Solution Approach 1:
The mechanical assembly process of joining separate components is replaced with ultrasonic welding or adhesive bonding. These joining methods create strong molecular-level bonds between the outer shell and removal sleeve, providing joint strength comparable to or exceeding traditional mechanical fastening methods, while maintaining the benefits of separate component manufacturing.
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 simplifies the production process, reduces costs, and enables the creation of closures that can withstand high forces and torque, while maintaining a secure and efficient mechanism for removing liquids from large containers.
Implementation Method 1
fixedly and tightly connected together by welding
Implementation Method 2
energy direction means like triangular ribs aiding in the welding process
Data Source
AI summary
A plastic screw cap (100) for large containers, comprises a cylindrical outer jacket (1) having a first internal thread (2) of larger diameter and a head plate (3), which at least partially closes the outer jacket (1) at an axial end, wherein the head plate has an opening (4), which accommodates a removal sleeve (20) having an approximately cylindrical inner jacket having a second internal thread (12) of smaller diameter, which inner jacket protrudes into the interior of the outer jacket, wherein the head plate (3) and the removal sleeve (20) are integrally joined to each other. In order to provide caps of the same functionality that can be produced more simply, the outer jacket (1), according to the invention, together with the head plate (3) on the one hand and the removal sleeve (20) together with the internal thread (2) on the other hand are produced separately from each other by injection molding and are joined to each other fixedly and tightly by welding in order to form the complete screw cap (100).