Preform Orientation via Mechanical Reference Element
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Solution Overview
Problem
Existing systems for orienting plastic material containers, particularly preforms, before blow molding and labeling processes are inefficient due to high costs, complexity, and limited precision, leading to suboptimal orientation and reduced productivity.
Innovation Solution
A conveying system with a closed circuit conveying chain and loading wheel, utilizing pads and cams to define and maintain the angular position of preforms and pads, ensuring accurate orientation from loading to blowing, and maintaining orientation during heating and labeling processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser devices or photocells are used to identify the notch on the neck of preforms, then measurement capability is provided, but the system requires maximum stability and absence of vibrations, acting on fields close to 0.1 mm, and uses complex expensive electronic devices
Solution Approach 1:
The patent replaces complex electronic measurement systems (laser devices, photocells) with a simple mechanical reference system. A reference element with a predetermined angular position is mechanically coupled to the conveying means, providing a stable reference without requiring complex electronics or vibration-free conditions. This mechanical reference system achieves the same orientation function with vastly reduced complexity.
2Manufacturing precision
If complex orientation systems with screwing pads are used, then orientation capability is provided, but the machine becomes very complex and customization costs are high
Solution Approach 1:
The patent extracts the essential orientation function from complex mechanical systems. Instead of using elaborate pad-screwing mechanisms, it isolates the core requirement (angular position reference) and implements it through a simple reference element mounted on the conveying means. This extraction reduces the system to only the necessary components for achieving orientation accuracy.
Solution Approach 2:
The reference element serves multiple functions: it provides the angular position reference, it is coupled to the conveying means, and it works with various preform types. This universal reference system replaces specialized complex orientation mechanisms that would require customization for different applications.
3Manufacturing precision
If orientation is performed only during the final step of conveying, then orientation capability is provided, but very high precision mechanics are required and movements are slow thus reducing productivity
Solution Approach 1:
The patent establishes the angular reference position in advance by mechanically coupling the reference element to the conveying means before the preforms arrive. This preliminary establishment of the reference system eliminates the need for high-precision mechanics during the orientation action itself, allowing faster operations and maintaining productivity while achieving the required precision.
4Manufacturing precision
If final-step orientation systems are used, then orientation capability is provided, but the action range is considerably reduced, limiting the types of neck to be oriented
Solution Approach 1:
The reference element provides a universal angular position reference that works with different preform and container types. The reference system is not limited to specific neck geometries, allowing the same mechanism to handle various container types (detergent containers, garden sprayers, bottles) without requiring customization, thus greatly enhancing adaptability.
Data Source
AI summary
A conveying system for plastic material container preforms for conveying the preforms to a blow molding machine, comprising angular orientation systems for the containers with respect to a predetermined reference system, capable of orienting the preforms from the step of loading onto a conveying line to the step of blowing the containers in a blowing machine. A corresponding method of orienting the containers is further described, which may be implemented in this system.