Centering Pin Alignment for Narrow Flange Thermoforming
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Solution Overview
Problem
Thermoforming packaging machines face challenges in producing packaging with a narrow flange width due to positioning and cutting tolerances, requiring adjustable stations and separate measurement systems.
Innovation Solution
Centering holes are formed in the lower film, allowing a centering pin to align the film, reducing feed tolerances and enabling precise positioning of packaging trays, thus allowing for the production of packaging with a narrower flange without the need for adjustable workstations or separate detection systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flange width is reduced to minimize material usage and improve packaging efficiency, then the packaging efficiency and material usage improve, but the positioning and cutting tolerances cannot be accommodated
Solution Approach 1:
The patent introduces a centering pin as an intermediary element that mediates between the conveyor system and the packaging cavity. The centering pin engages with centering holes in the bottom film to provide precise positioning reference, enabling narrow flange design while maintaining manufacturing precision through mechanical alignment rather than relying solely on conveyor positioning accuracy
Solution Approach 2:
The patent replaces the conventional optical/measuring systems with a simple mechanical centering mechanism. Instead of using sensors and electronic control to detect and compensate for positioning errors, the invention uses a purely mechanical centering pin and hole system that passively provides accurate positioning through physical engagement, simplifying the overall system while achieving the desired precision
2Manufacturing precision
If adjustable sealing and cutting stations with separate measuring systems are used to achieve precise positioning, then the manufacturing precision improves, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex adjustable sealing and cutting stations with their separate measuring systems. By removing these complicated subsystems and replacing them with the simple centering pin mechanism integrated into the existing conveyor, the invention achieves positioning precision without the added device complexity of adjustable stations and electronic measurement systems
Solution Approach 2:
The centering mechanism is designed to be self-aligning and self-positioning. The centering pin automatically finds its reference point in the centering hole, providing self-service positioning without requiring external measurement systems, sensors, or complex control mechanisms to detect and correct positioning errors
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 method enhances the precision and reproducibility of packaging production by compensating for conveyor inaccuracies and reducing the flange width, while being cost-effective and easy to implement.
Implementation Method 1
In the forming station, packaging cavities are formed in the bottom film by thermoforming
Implementation Method 2
In the sealing station, the filled packaging cavities are sealed by bonding a top film to the bottom film
Data Source
Figure 1~3
Figure 4A~4C
AI summary
A bottom film (17) is conveyed at a controlled rate along a transport direction (T) by means of a conveyor (13) to a forming station (5), then to an insertion section (7), further to a sealing station (9), and again to a cutting station (11). Packaging cavities are formed in the bottom film (17) by deep drawing in the forming station (5). The packaging cavities are filled with products (23) in the insertion section (7). The filled packaging cavities are sealed in the sealing station (11) by bonding a top film (25) to the bottom film (17). The filled packaging cavities are cut from the film assembly in the cutting station (11). Centering holes (33) are formed in the bottom film (17) in a defined relative position to the packaging cavities, and the bottom film (17) is aligned by the engagement of at least one centering pin (41) in the centering holes (33).