Modular Cavity Inserts for Preform Mold Ejection
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Solution Overview
Problem
Existing molding systems face challenges in forming and efficiently removing preforms, particularly the neck region, which requires complex mold inserts and ejection mechanisms, limiting modularity and versatility.
Innovation Solution
A modular mold assembly with a cavity plate and cavity inserts featuring a taper and mounting face, where at least two-thirds of the molding cavity extends beyond the plate, and a cooling channel system for efficient cooling and ejection, allowing for more versatile and efficient molding of tubular articles like preforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If split mold inserts are used to form the neck region, then the neck region can be formed with engaging features and anti-pilferage assembly, but the device complexity increases and modularity decreases
Solution Approach 1:
The mold assembly is divided into modular components: a cavity plate that can be selectively removed, cavity inserts mounted to the cavity plate, and core inserts mounted to the core plate. This segmentation allows the neck region forming capabilities to be isolated in removable cavity inserts, reducing overall system complexity while maintaining versatility.
Solution Approach 2:
The cavity plate serves multiple functions: it provides a mounting surface for various cavity inserts, enables selective removal for access to different mold components, and facilitates the formation of diverse preform designs. This multi-functionality reduces the need for separate specialized components.
2Ease of operation
If complex ejection mechanisms are used to remove preforms, then preform removal is achieved, but the device complexity increases and manufacturing efficiency decreases
Solution Approach 1:
The core inserts are designed with self-ejecting features that utilize the molding process itself and simple mechanical movements to automatically release and eject preforms. The cavity plate removal provides direct access to preforms for removal without requiring complex ejection mechanisms.
Solution Approach 2:
Instead of using complex mechanisms to push preforms out, the design allows the cavity plate to be removed from the mold assembly, providing direct access to preforms on the core inserts. This inversion of the ejection approach simplifies the overall ejection system.
3Area of stationary object
If cavity inserts are mounted within the cavity plate, then the molding cavity is defined, but the molding surface area is limited by the plate size
Solution Approach 1:
The cavity inserts are separate, removable components that can be mounted to the cavity plate. This segmentation allows different cavity insert configurations to be used with the same cavity plate, effectively increasing the variety of molding surfaces and preform designs that can be achieved without increasing the plate size.
Solution Approach 2:
The cavity plate can be selectively removed and reconfigured with different cavity inserts, allowing the molding system to dynamically adapt to different preform design requirements. This dynamic reconfigurability increases versatility without requiring a larger stationary plate.
4Temperature
If cooling channels are integrated into the cavity plate, then cooling efficiency is improved, but the plate depth and overall mold complexity increase
Solution Approach 1:
The cooling channels are integrated within the cavity plate structure, with cooling channels in the cavity plate positioned to work in conjunction with cooling channels in the cavity inserts. This nested arrangement provides efficient cooling without requiring excessive plate depth, as the cooling function is distributed across multiple nested components.
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
Enhances the modularity and efficiency of molding processes by facilitating the formation and removal of preforms, particularly the neck region, with improved cooling and ejection mechanisms, enabling the production of diverse preform designs.
Implementation Method 1
The so-injected material is then cooled to a temperature sufficient to enable removal of the so-formed molded article from the molding cavity
Implementation Method 2
a cooling channel which has a depth that is at least 15% of the plate depth
Data Source
AI summary
A cavity plate assembly (400) for a preform mold (100), which includes a cavity plate (410) having an array of seats (412) and a corresponding array of cavity inserts (440) mounted to a front face (CVF) of the cavity plate (410) and in communication with a respective seat (412). Each cavity insert (440) includes a body (441) with a mounting face (441a) and a spigot (443) projecting from the mounting face (441a) and received in a respective seat (412) of the cavity plate (410) such that the mounting (441a) face abuts the front face (CVF) of the cavity plate (410). Each cavity insert (440) also includes a molding surface (448) along its length, at least two thirds of which extends beyond the cavity plate (410).