Blow Molding Preform Temperature Adjustment Rod
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Solution Overview
Problem
The hot parison type blow molding apparatus faces challenges in achieving uniform temperature distribution among preforms due to short molding cycle times, leading to inconsistent thickness and quality in resin containers, particularly under high cycle conditions where temperature adjustment treatments are insufficient.
Innovation Solution
A blow molding apparatus with an injection molding part, a temperature adjustment part using a temperature adjustment rod to contact the inner surface of the preform within a temperature adjustment mold, and a blow molding part that stretches the body portion of the preform to optimize temperature conditions, ensuring uniformity and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the molding cycle time is significantly shortened to improve productivity, then the number of molded products taken per cycle increases, but the time for temperature adjustment treatment of preforms is insufficient, leading to non-uniform temperature distribution and inconsistent quality
Solution Approach 1:
The temperature adjustment process is segmented into multiple heating zones along the preform, with each zone independently controlled by separate heating elements. This allows different portions of the preform to receive tailored heating, ensuring uniform temperature distribution even under high-speed cycling conditions where total adjustment time is limited.
Solution Approach 2:
The heating elements are pre-positioned and pre-heated before the preform arrives at the temperature adjustment station. When the preform enters the adjustment zone, the heating elements are already at optimal temperature, eliminating warm-up time and enabling immediate effective temperature adjustment, thus maintaining quality consistency despite reduced cycle times.
2Productivity
If the number of rows of lip mold is increased to improve productivity, then the number of molded products per cycle increases, but the apparatus complexity and device size increase
Solution Approach 1:
The temperature adjustment apparatus is designed with universal heating elements and control mechanisms that can serve multiple preform positions simultaneously. The same heating system architecture is reused across different rows and positions, allowing the apparatus to handle increased production volumes without proportionally increasing system complexity.
Solution Approach 2:
The heating elements are arranged in a nested configuration where multiple heating zones are positioned concentrically or in layered arrangements around the preform path. This compact nesting allows multiple heating functions to be integrated into a confined space, increasing productivity capacity without proportionally expanding the overall apparatus footprint or structural complexity.
3Productivity
If the molding cycle time is shortened, then productivity improves, but the thickness distribution and appearance quality of resin containers deteriorate
Solution Approach 1:
Different sections of the preform are subjected to different heating intensities and durations based on their specific thermal requirements. The heating elements are positioned and controlled to provide localized temperature optimization, ensuring that each portion of the preform reaches the optimal temperature for blow molding, thereby achieving uniform wall thickness and high appearance quality even under shortened cycle times.
Solution Approach 2:
The heating system dynamically adjusts temperature parameters (heating power, heating duration, heating zone activation) based on real-time detection of preform temperature and position. This parameter optimization ensures that the preform achieves the precise temperature required for high-quality molding within the compressed cycle time, maintaining consistent thickness distribution and surface appearance across all produced containers.
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
The solution allows for effective temperature adjustment and stretching of preforms in a short time, resulting in resin containers with improved thickness distribution and appearance, enhancing productivity and quality consistency.
Implementation Method 1
performing a temperature adjustment treatment to the preform by bringing the temperature adjustment rod into contact with an inner surface of the preform
Implementation Method 2
a blow molding part configured to blow-mold the preform to form a resin container
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A temperature adjustment part 40 is configured to stretch a preform 10 by moving a temperature adjustment rod 42 toward a bottom surface portion (lower body portion) 12c side of a body portion 12 by a predetermined distance D1, after inserting the temperature adjustment rod 42 into the preform 10 to bring the temperature adjustment rod 42 into contact with an inner surface of the body portion 12 of the preform 10 other than a boundary portion between the body portion 12 and a neck portion 11.