Adjustable Stripper Ring for Thin-Wall Core Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing molding apparatuses face challenges in accurately adjusting the position of cores to achieve uniform wall thickness in hollow plastic items with thin walls, leading to deformations due to non-uniform material filling and pressure distribution during the injection process.
Innovation Solution
A component comprising a first body with a face and a second body, or stripper ring, allowing for the adjustment of the core's position through a plurality of elements that displace parallel to an axis, utilizing inclined surfaces for micrometric adjustments without the need for disassembly or insertion of adjustment films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adjustment films are inserted or removed to adjust core position, then manufacturing precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The core support plate is designed with movable adjustment elements (screws or bolts) that allow dynamic positioning of the core. The adjustment elements can be moved along guided paths to change the core's position in real-time, eliminating the need for static adjustment films and enabling continuous fine-tuning of core alignment with the cavity.
Solution Approach 2:
The patent replaces the film-based adjustment mechanism with a mechanical screw or bolt system that provides direct, controlled movement of the core support plate. This mechanical substitution allows for precise, repeatable adjustments through threaded engagement, replacing the less controllable film thickness variation method.
2Manufacturing precision
If adjustment is made at the base of the core, then manufacturing precision is improved, but ease of operation deteriorates due to difficult accessibility
Solution Approach 1:
The adjustment elements are positioned on the outer peripheral surface of the core support plate, which is accessible from the radial direction rather than requiring access to the base of the core. This dimensional shift in adjustment location allows operators to access and adjust core position from the side, improving ergonomics and accessibility while maintaining precision.
3Ease of manufacture
If the core tip is far from alignment elements, then ease of manufacture is improved, but manufacturing precision deteriorates due to decentering under load
Solution Approach 1:
The adjustment elements are positioned to act on the core support plate before the injection molding process begins. The core position is pre-adjusted and locked in place using the movable adjustment elements, ensuring proper centering is established beforehand. This preliminary action prevents decentering that would occur if alignment elements were placed too far from the core tip during the actual molding process.
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
Enables easy and accurate adjustment of core position, minimizing decentering and ensuring uniform wall thickness in molded items, particularly in hollow plastic products like test tubes and syringes, by facilitating accessible and precise positioning without disassembling the apparatus.
Implementation Method 1
the second body has an outer surface comprising a plurality of inclined portions, in particular with respect to said axis X; and wherein each element of said plurality of elements has an outer surface comprising an inclined portion, in particular with respect to said axis X, which is in contact with a respective inclined portion of the second body
Data Source
AI summary
A component (100, 100′) of a molding apparatus (110, 110′) for producing hollow plastic items, in particular test tubes, syringes or tubular bodies, the component (100, 100′) comprising: —a first body (1,1″) having a face (11) defining part of a separation surface of the molding apparatus (110, 110′); —a second body (2, 2′), or stripper ring, inserted in the first body (1, 1′), adapted to be crossed along an axis (X) by a core (3), and in particular to come into contact with the core (3); —a plurality of elements (4, 4′) inserted in the first body (1, 1′), adapted to be displaced parallel to the axis (X); in which the second body (2, 2′) has an outer surface (20) comprising a plurality of inclined portions (21, 21′), in particular with respect to said axis (X); and in which each element (4, 4′) of said plurality of elements (4, 4′) has an outer surface comprising an inclined portion (41, 41′), in particular with respect to said axis (X), which is in contact with a respective inclined portion (21, 21′) of the second body (2, 2′) so that the position of the second body (2, 2′) can be adjusted by means of said plurality of elements (4, 4′).