Angled Push-in Unit for Thermoforming Packaging Troughs
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Solution Overview
Problem
Existing thermoforming methods for producing packaging troughs are limited in creating complex shapes and recesses, especially with thicker films, leading to unsatisfactory contact quality and requiring additional processing steps, which can cause stress-whitening and affect the package's stability and aesthetics.
Innovation Solution
A method involving a forming station with a push-in unit that extends from the male die part at an angle relative to the vertical direction to support the film web during thermoforming, allowing for improved shape quality and the creation of reclosure recesses or notches without additional processing steps, using compressed air or mechanical actuators for extension and potentially separate heating for the push-in unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermoforming methods are used with thicker films (700 μm or more), then the film can be processed, but the contact quality between the film and the inner wall of the mold cavity in the area of lateral recesses is unsatisfactory
Solution Approach 1:
The male die part is segmented into a main body and an extendable push-in unit that can protrude separately to access recess areas. This segmentation allows the forming tool to reach into lateral recesses of the mold cavity and establish proper contact with thick films in those areas, resolving the contact quality issue while maintaining the ability to form complex shapes.
Solution Approach 2:
The push-in unit is designed to be dynamically extendable and retractable during the thermoforming cycle. It protrudes into the recess area during forming to ensure contact quality, then retracts to allow ejection. This dynamic adjustment enables the system to adapt to different film thicknesses and recess geometries, improving manufacturing precision for complex shapes.
2Ease of manufacture
If recesses and notches are formed by pressing-in in a separate processing step after thermoforming, then reclosure elements can be created, but stress-whitening occurs and additional processing time is required
Solution Approach 1:
The push-in unit integrates the reclosure element forming function directly into the thermoforming process. By extending the male die part with this unit, recesses and notches are created during the same cycle as the main forming operation, eliminating the need for separate pressing-in steps and avoiding stress-whitening caused by post-forming mechanical deformation.
Solution Approach 2:
The reclosure elements (recesses and notches) are formed preliminarily during the thermoforming process itself, before the film cools and solidifies. The push-in unit creates these features while the material is still thermoplastic and formable, preventing the stress-whitening that occurs when cold, rigid film is deformed in subsequent operations.
3Manufacturing precision
If the push-in unit is extended from the male die part, then contact quality in recess areas is improved, but the device complexity increases
Solution Approach 1:
The push-in unit serves multiple functions: it improves contact quality in recess areas, forms reclosure elements (recesses and notches), and can be adjusted for different film thicknesses. By integrating these functions into a single extendable component on the male die part, the invention achieves manufacturing precision improvements without proportionally increasing 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
Enables the production of packaging troughs with complex shapes and reclosure features efficiently, eliminating the need for additional processing steps and improving contact quality, especially with thicker films, by supporting the film web during thermoforming.
Implementation Method 1
a forming station (1) for producing a packaging trough (3) by thermoforming
Implementation Method 2
using compressed air or mechanical actuators for extension
Data Source
AI summary
A forming station for producing a packaging trough by thermoforming at least an area of a film web positioned between a forming tool upper part and a forming tool lower part of the forming station. A male die part of the forming tool upper part may be moved in a vertical direction and inserted into a forming space of a female die part of the forming tool lower part. The packaging trough is produced by deforming the film web between the male die part and an inner wall of the forming space of the female die part. In an inserted condition of the male die part within the female die art, a push-in unit is extended from the male die part towards the inner wall of the forming space at an angular orientation relative to the vertical direction.