Tray Lid Sealing With Bottom-Up Film Cutting Accuracy
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Solution Overview
Problem
Existing tray sealing machines face issues such as inaccurate cutting of lidding films, film sticking to heated knives, maintenance difficulties, and increased downtime due to knife cooling requirements, leading to poor packaging quality and high waste rates.
Innovation Solution
A method and sealing station for applying a lidding film to a packaging tray, involving a clamping process with a heated sealing frame above and cutting from below using a knife mounted on the lower tool section, allowing precise and reliable cutting, reduced maintenance, and improved film positioning relative to the tray.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the knife is mounted on the heated sealing frame for cutting the lid film from above, then the cutting function is integrated with the sealing frame, but the knife heats up causing the lid film to stick to the knife and become dirty
Solution Approach 1:
The cutting function is separated from the sealing frame by providing an independent knife mounted on the lower tool section. This segmentation allows the knife to operate independently from the heated sealing frame, eliminating the harmful thermal effect on the lid film while maintaining the integrated sealing and cutting functions at the system level.
Solution Approach 2:
Instead of cutting the lid film from above as in conventional designs, the knife is positioned below the lid film and cuts upward. This inversion changes the cutting direction so that the knife does not contact the heated sealing frame, preventing the lid film from sticking to the knife while still achieving effective cutting.
2Device complexity
If the knife is mounted on the heated sealing frame, then the structure is simplified, but access to the knife for maintenance becomes difficult
Solution Approach 1:
The knife is segmented from the sealing frame structure and mounted independently on the lower tool section. This segmentation provides clear access paths to the knife from below, allowing maintenance personnel to easily reach and service the knife without disassembling the sealing frame or other components.
Solution Approach 2:
The knife is positioned in a different spatial dimension (below the lid film rather than above) and mounted on the lower tool section rather than the upper sealing frame. This dimensional change creates unobstructed access from the bottom side, facilitating easy maintenance while maintaining structural integration at the system level.
3Ease of operation
If the knife is mounted on the sealing frame from above, then the cutting action is straightforward, but the lid film is often cut inaccurately relative to the packaging tray
Solution Approach 1:
The cutting direction is inverted from above-to-below to below-to-above. By positioning the knife below the lid film and cutting upward, the knife can more accurately follow the contour of the packaging tray, achieving precise cutting relative to the tray geometry while maintaining operational simplicity.
Solution Approach 2:
The knife is specifically positioned and oriented to match the local geometry of the packaging tray. The upward cutting action allows the knife to adapt to the specific contour and dimensions of each tray, achieving high cutting accuracy tailored to local requirements rather than applying a uniform cutting approach.
4Ease of operation
If the knife is moved from top to bottom to cut the film, then the cutting motion is simple, but the lid film may be bent away from the packaging tray when the knife is moved back, impairing packaging quality
Solution Approach 1:
The knife motion is inverted from downward to upward. By cutting from below and moving the knife upward after cutting, the lid film remains supported by the packaging tray throughout the process. The upward retraction prevents the lid film from bending away, maintaining packaging quality while keeping the cutting motion simple.
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 precise cutting of lidding films to packaging trays, reducing waste and maintenance costs, enhancing packaging quality, and increasing production efficiency by minimizing film sticking and knife heating issues.
Implementation Method 1
a heated sealing frame (5) is attached to the tool upper part (3)
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method for applying a lid film (8) to a packaging tray (7) by means of a sealing station (2, 20), wherein the sealing station (2, 20) comprises a packaging tray holder (6) for receiving the packaging tray (7), a tool upper part (3), a tool lower part (4) and a clamping frame (31), wherein a heated, movable sealing frame (5) is attached to the tool upper part (3), comprises the following steps: clamping a clamping area (81) of the lid film (8) between the clamping frame (31) and the tool upper part (3), moving the sealing frame (5) from above onto the lid film (8) to seal a sealing area (82) of the lid film (8) to the packaging tray (7), and cutting the lid film (8) from below with a knife (9).