Adjustable Guides for Preform Heating and Rotational Alignment
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Solution Overview
Problem
Existing devices for preform heating and processing face challenges in achieving precise rotational alignment and temperature distribution, leading to positioning errors during transfer and subsequent forming processes, particularly for non-circular containers, which are critical for optimal product quality.
Innovation Solution
The device incorporates an adjustable and/or displaceable guide along the transport path to control the rotational positioning of preforms, ensuring a consistent heating profile from the heating section to the output area, using mechanisms like spindle drives and sensors to correct and adjust the guide based on real-time measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the preform is continuously rotated around its longitudinal axis during heating, then uniform heating is achieved, but preferential heating cannot be applied to create anisotropic temperature profile
Solution Approach 1:
The holder is designed to be rotatable about its longitudinal axis, allowing dynamic adjustment of the preform's orientation during the heating process. This enables the system to switch between uniform heating (continuous rotation) and preferential heating (controlled orientation) modes, resolving the contradiction between heating uniformity and profile adaptability
2Temperature
If the preform is guided through the heating section in a specific orientation for preferential heating, then anisotropic temperature profile is achieved, but positioning errors occur during transfer to subsequent processes
Solution Approach 1:
The positive guidance device is positioned upstream of the heating section to pre-establish the correct rotational orientation of the preform before it enters the heating zone. This preliminary positioning action ensures that when the preform is guided through the heating section in a specific orientation, the alignment is maintained through the transfer area, resolving the contradiction between preferential heating and positioning precision
Solution Approach 2:
The system incorporates sensors to detect the actual rotational position of the preform and feeds this information back to the control unit. The control unit then adjusts the guidance device or holder rotation to correct any positioning deviations, ensuring precise alignment is maintained throughout the heating and transfer process
3Manufacturing precision
If the guide is made adjustable and/or displaceable to correct rotational positioning, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The positive guidance device is segmented into multiple independent sections along the transport path, with each section capable of being adjusted or displaced independently. This segmentation allows the system to correct rotational positioning at specific locations without requiring the entire guidance system to be complex, resolving the contradiction between positioning precision and device complexity
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 solution enables precise control of temperature distribution and alignment, reducing positioning errors and ensuring uniformity in the heating profile, thereby improving the quality of non-circular plastic containers produced through processes like stretch blow molding.
Implementation Method 1
The heating devices arranged along the transport path and acting on the preforms passing through the heating section deliver a greater amount of energy to the sides facing the heating devices, thus heating them more intensely
Implementation Method 2
a driver arranged eccentrically to the rotational axis and rotationally coupled to the holder
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
The invention relates to a device (1) for treating preforms (2), comprising a heating arrangement (3) with a transport device (6) for transporting the preforms (2) from an input area (A) to an output area (B) along at least one transport path (T) having a heating section (7). The transport device (6) is designed with a plurality of transport units (8) which are movable in a revolving manner in a transport direction (t), each of which has a holder (8a) which is rotatable about an axis of rotation (r) for receiving a respective preform (2), and a driver (8b) which is arranged eccentrically in a functional plane (F) relative to the axis of rotation (r) and is rotationally coupled to the holder (8a).The device (1) further comprises at least one positive guide device (9) formed along the transport path (T), which is designed to interact with the transport units (8) and thereby determine the respective rotational position of the holder (8a). The positive guide device (9) has a guide (10) arranged in the functional plane (F) along at least one section of the heating section (7) and interacting with the driver (8b). According to the invention, the guide (10) is designed to be adjustable and/or displaceable at least in sections.