Adjustable Counter-Stretching Rod for Blow Molding Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing blow molding technologies face challenges in maintaining preform alignment within the mold due to variations in preform length, leading to offsetting issues during the shaping process, which cannot be adequately addressed by existing counter-stretching rod systems designed for a single preform size.
Innovation Solution
A modular mold design featuring a removable cylinder and crosspiece system allows for easy adaptation to preforms of different lengths, ensuring the counter-stretching rod can maintain preform alignment by adjusting its length and position relative to the mold bottom, preventing offsetting during blow molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-length counter-stretching rod is used in the mold, then preform alignment is maintained for a specific preform size, but the mold cannot accommodate preforms of different lengths
Solution Approach 1:
The counter-stretching rod is made adjustable in length through a telescopic mechanism with nested segments that can extend and retract. This dynamic structure allows the rod to adapt its length to match different preform sizes while maintaining precise alignment control during the blow molding process
Solution Approach 2:
The counter-stretching rod is divided into multiple telescopic segments that can extend and retract independently. This segmentation allows the rod to adjust its overall length by extending or retracting the nested segments, enabling accommodation of various preform lengths while maintaining structural integrity and alignment precision
2Adaptability or versatility
If the counter-stretching rod is made telescopic to accommodate different preform lengths, then adaptability improves, but device complexity increases
Solution Approach 1:
The telescopic mechanism employs dynamic segments that can extend and retract along guide rails, allowing the counter-stretching rod to adapt its length. This dynamic design provides versatility for different preform sizes while using straightforward mechanical components that minimize overall system complexity
Solution Approach 2:
The counter-stretching rod utilizes a nested telescopic structure where smaller segments are housed within larger segments, similar to nested dolls. This nesting approach allows multiple length configurations within a compact space, achieving adaptability without proportionally increasing the device's external complexity
3Adaptability or versatility
If the counter-stretching rod is extended to accommodate longer preforms, then longer preforms can be processed, but the rod may penetrate the preform bottom causing defects
Solution Approach 1:
The counter-stretching rod features dynamic length adjustment through telescopic segments that can extend to accommodate longer preforms or retract for shorter ones. This dynamic control ensures the rod tip maintains appropriate distance from the preform bottom, preventing penetration defects while processing various preform lengths
Solution Approach 2:
The system changes the physical parameter of the counter-stretching rod's length dynamically based on the preform size being processed. By adjusting the rod length parameter to match the specific preform dimensions, the system prevents excessive extension that would cause bottom penetration while maintaining the capability to process different preform lengths
Data Source
AI summary
Disclosed is a mold for manufacturing a container from a preform, the mold including: a side wall, a mold bottom having a through-passage in the center thereof, a cylinder including a body and a counter stretch molding rod that is mounted so as to be slidable relative to the body between an extended position in which the counter stretch molding rod projects relative to the mold bottom and a retracted position, a stand on which the mold bottom is mounted, this stand including a lower stage, an upper stage and a spacer detachably inserted between the upper stage and the lower stage and defining the cavity in part.