Asymmetric Hold-Down Device for Thermoforming Heating Area Expansion
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Solution Overview
Problem
Conventional thermoforming packaging machines face limitations in heating area expansion due to lateral transport chains, leading to cold/warm zones and ripple formation during deep drawing, which affects sealing processes, and require customized heating plates and punching units for different packaging formats, resulting in increased construction costs and complexity.
Innovation Solution
A work station with a height-adjustable lower tool part and an upper tool part featuring a radiator and a punching device, where the hold-down device is positioned further away from the outer edge of the punch body, allowing for a wider heating plate and standardized punching unit arrangement, enabling optimal heating and forming of the film web and preventing flap collapse during sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the heating plate width is increased to expand the heating area, then the heating coverage is improved, but the lateral conveyor chains collide with the heating plate
Solution Approach 1:
The hold-down device is positioned asymmetrically offset towards the outer edge region of the punch body rather than being centered. This asymmetric positioning creates space between the heating plate and the lateral conveyor chain, allowing the heating plate to extend wider without collision while maintaining proper film support during punching.
2Adaptability or versatility
If customized heating plates are created for different packaging formats, then the adaptability is improved, but the construction costs and time expenditure increase
Solution Approach 1:
The punching unit is designed with a standardized configuration where the hold-down device can be positioned at different offset distances from the punch body edge. This standardized yet adjustable design allows the same punching unit to work with heating plates of various widths for different packaging formats, eliminating the need to create entirely new customized heating plates and punching units for each format.
3Stability of the object's composition
If the hold-down device is positioned centrally above the punch, then the structural symmetry is improved, but the tabs tilt downward during sealing preventing proper evacuation and gassing
Solution Approach 1:
The hold-down device is positioned asymmetrically offset towards the outer edge region of the punch body. This asymmetric positioning causes the film to be held down in a specific location that prevents the tab from tilting downward during sealing. The offset position ensures proper film support and alignment, allowing the tab to remain in the correct position for effective evacuation and gassing processes.
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 allows for broader heating of the packaging format, preventing wave formation and enabling standardized equipment use across various designs, while ensuring flaps remain aligned for efficient sealing and evacuation processes.
Implementation Method 1
A section of the bottom film web is heated, for example, with a heating plate in the forming station
Implementation Method 2
punching units are provided, for example, in the forming station or preheating station, between one of the lateral conveyor chains and the heating plate of the forming station
Data Source
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AI summary
The invention relates to a thermoforming packaging machine (1) comprising at least one workstation (A) for heating a bottom film (U) for a forming operation and lateral transport chains (10, 10a) configured to grip the bottom film (U) laterally at the entrance to the thermoforming packaging machine (1) and to transport the bottom film (U) intermittently through the workstation (A) in a working direction (R), wherein the workstation (A) has a height-adjustable lower tool part (14), a upper tool part (15) positioned above it with at least one heating element (16) for heating the bottom film (U), and a punching device (18) with at least one punching unit (19) for producing a perforation (L) in an edge strip area (26) of the bottom film (U), wherein the punching unit (19) has at least one punch (20) provided on the lower tool part (14) and at least one hold-down device cooperating with the punch (20). (21)which is provided on the upper part of the tool (15), and wherein the punch (20) has a punch body (29) with an outer edge region (31) facing the lateral transport chain (10, 10a) and with an inner edge region (32) facing the heating element (16), wherein the hold-down device (21) is arranged at least partially between one of the lateral transport chains (10, 10a) and the heating element (16), wherein the hold-down device (21) is positioned further towards the outer edge region (31) of the punch body (29) than towards the inner edge region (32) of the punch body (29).