Thermoforming Receptacle Label Positioning Mechanism
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Solution Overview
Problem
Existing devices for manufacturing receptacles with decorative wrap-around labels via thermoforming often have complex mechanisms and result in receptacles with unwanted shoulders at the lower edge of the label, leading to aesthetic issues and potential weaknesses in the thermoplastic material.
Innovation Solution
A device with a moving end-wall that transitions between a positioning high level and a thermoforming low level, utilizing a tongue-and-groove system with fins and notches to position the label correctly, eliminating the need for retractable members and simplifying the mechanism, allowing the thermoplastic material to form a ribbed surface without weaknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If retractable members or moving end-wall portions are used to position wrap-around labels, then label positioning precision is improved, but device complexity increases
Solution Approach 1:
The invention extracts and eliminates the complex retractable members and moving end-wall portions from the device. Instead, it uses a fixed end-wall with a simple abutment feature that positions the wrap-around label during insertion, thereby maintaining labeling precision while dramatically reducing mechanism complexity.
Solution Approach 2:
The device allows the wrap-around label to self-position against the abutment on the end-wall during the insertion process. The label's own insertion motion accomplishes the positioning function that previously required complex retractable mechanisms, achieving self-service positioning.
2Manufacturing precision
If retractable members are used to form stop abutments for wrap-around labels, then label positioning is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention removes the retractable members that created high manufacturing precision requirements. The fixed abutment on the end-wall can be manufactured with standard tolerances, eliminating the need for high-precision manufacturing while maintaining effective label positioning.
3Ease of operation
If shoulders are formed at the lower edge of wrap-around labels, then label positioning is simplified, but receptacle aesthetic quality and structural strength deteriorate
Solution Approach 1:
The invention uses a dynamic insertion process where the end-wall moves to accommodate the wrap-around label, allowing the label to be positioned and secured without forming a static shoulder. This dynamic approach maintains both positioning simplicity and structural integrity.
Solution Approach 2:
Instead of forming a shoulder to position the label, the invention inverts the approach by using an abutment that the label naturally contacts during insertion. This reverses the traditional method and eliminates the harmful shoulder while maintaining positioning effectiveness.
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 enables the production of receptacles without shoulders at the lower edge of the label, enhancing their appearance and structural integrity by forming ribs that reinforce the material, while maintaining a simple and efficient mechanism.
Implementation Method 1
Device and method for manufacturing receptacles provided with decorative wrap-around labels by thermoforming
Implementation Method 2
a piston mounted to move in the wrap-around label insertion chamber to push a decorative wrap-around label into the thermoforming chamber through said axial opening
Data Source
AI summary
The device includes a mold block having at least one thermoforming chamber (28) having an inside surface (29), an axial opening (28A) through which a decorative wrap-around label (38) can be inserted into the chamber, and a moving end-wall (40) opposite from the opening. The end-wall is suitable for moving in an end segment (28A) of the chamber (28) between a positioning high level and at least one thermoforming low level, and the device has at least one tongue-and-groove set comprising a fin (42) on the end-wall (40) that is engaged in a notch (44) in the inside surface of the end segment (28B).