Gastight Film Packaging with Pre-cutting to Prevent Edge Warping
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Solution Overview
Problem
Existing methods for gastight packaging using vacuum-sealed film often result in sharp, jagged edges and warping due to cutting the film while it is still heated, and can damage the tray's peripheral rim during the process.
Innovation Solution
Cutting the film to size before applying it to the tray, allowing for a secure, gastight seal and deep-drawing operation, while using a device with a cutting tool and sealing tool that can operate independently to prevent damage to the tray and ensure smooth edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the film is cut after heat-sealing while still heated, then the film is soft and easy to cut, but the cut edges become jagged and warped
Solution Approach 1:
The film is cut to the size of the peripheral rim before being applied to the tray, while the film is still in its cold, hardened state. This preliminary cutting action prevents the film from being jagged or warped after heat-sealing, as the cutting occurs when the film has structural integrity and resistance to deformation.
2Productivity
If the film is cut after heat-sealing, then the cutting can be done in one step with tray shifting, but the tray peripheral rim is damaged
Solution Approach 1:
The film is cut to size before being applied to the tray, using a cutting device that operates independently of the tray shifting mechanism. This preliminary cutting separates the cutting operation from the heat-sealing operation, allowing the tray rim to remain intact while still achieving efficient one-step processing through coordinated timing.
3Manufacturing precision
If the film is cut in the cold state, then smooth edges are achieved, but the film must be handled separately before application
Solution Approach 1:
The cutting device is spatially assigned to the sealing tool, combining the cutting and heat-sealing operations into a single integrated assembly. This merging allows the film to be cut to size and then immediately heat-sealed without separate handling steps, maintaining smooth edges while reducing process complexity through operational integration.
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 prevents edge warping and damage to the tray, achieving a secure, gastight seal with smooth edges and maintaining the tray's rim integrity, while ensuring the packaged items remain fresh by preventing gas and liquid escape.
Implementation Method 1
the deep-drawable film is heat-sealed onto the peripheral rim
Implementation Method 2
using a vacuum, the object being placed in a tray and a deep-drawable film being attached to the tray for sealing
Implementation Method 3
the film is able to be expanded easily in this state
Data Source
AI summary
In the case of a method for the gastight packaging of objects using a film material fitting tightly on the objects using a vacuum, the object being placed in a tray and a deep-drawable film being attached to the tray for sealing, it is provided that a tray having at least one peripheral rim is used to form the packaging, the deep-drawable film is cut to the size of the peripheral rim, and that the deep-drawable film is subsequently and/or simultaneously applied to the peripheral rim in a gastight manner.A device preferably for carrying out this method has at least one cutting device for the deep-drawable film.