Food Packaging Tub With Thickened Zones for Glue-Free Stabilization
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Solution Overview
Problem
Current manufacturing processes for food packaging trays require a stabilization step using quick-setting glue, which complicates the process, increases costs, and leads to soiling and maintenance issues.
Innovation Solution
A tray design with adhesion zones surrounded by thicker portions of the side wall, allowing the outer shell to be folded without glue, and a method involving a thermoforming mold with retaining means to maintain the pre-assembled configuration, followed by heat activation of the adhesive coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quick-setting glue is applied to stabilize the blank in pre-assembled configuration, then the outer shell can be formed without coming out of the mold, but the manufacturing process becomes more complex and costs increase
Solution Approach 1:
The blank is designed with pre-formed thicker portions at the locations where adhesion zones will be positioned. These thicker portions are created during the folding process itself, before the thermoforming step, eliminating the need for subsequent glue application to achieve stabilization.
Solution Approach 2:
The invention removes the quick-setting glue step entirely from the manufacturing process. The stabilization function previously achieved by glue is extracted and replaced by the structural design of thicker portions in the blank that inherently provide the necessary stability during thermoforming.
2Reliability
If quick-setting glue is applied to stabilize the blank, then the outer shell maintains its shape, but manufacturing costs increase due to additional glue material and processing
Solution Approach 1:
The invention eliminates the quick-setting glue material and associated processing costs by designing the blank with thicker portions that provide inherent shape stability. This extraction of the glue requirement directly reduces manufacturing costs while maintaining the necessary shape stability during thermoforming.
Solution Approach 2:
The invention changes the physical parameter of the blank by creating thicker portions with increased material density and structural rigidity at specific locations. This parameter change provides the necessary mechanical stability without requiring additional chemical adhesives, thereby reducing manufacturing costs.
3Reliability
If quick-setting glue is applied to stabilize the blank, then the outer shell remains in position, but soiling phenomena occur requiring frequent cleaning and maintenance
Solution Approach 1:
The invention removes the quick-setting glue application step that causes soiling and contamination. By using thicker portions of the blank itself to provide stability, the harmful byproducts of glue application are eliminated, reducing cleaning and maintenance requirements.
Solution Approach 2:
The invention converts the blank's own material structure into the stabilizing mechanism. Instead of using an external adhesive that creates soiling, the thicker portions of the blank material itself provide the necessary position stability, turning the blank's structural properties into a beneficial feature that eliminates contamination issues.
4Reliability
If quick-setting glue is applied to stabilize the blank, then the outer shell configuration is maintained, but manufacturing rates are reduced due to frequent cleaning operations
Solution Approach 1:
The invention extracts the problematic glue application and cleaning steps from the manufacturing process. By using thicker portions of the blank for stabilization, the production line no longer requires frequent stoppages for cleaning, thereby maintaining higher manufacturing rates while still ensuring configuration stability.
Solution Approach 2:
The thicker portions are formed as part of the preliminary blank preparation and folding process, before the thermoforming step. This preliminary structuring eliminates the need for subsequent cleaning operations that would slow down production, allowing continuous manufacturing at higher rates.
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
Eliminates the need for quick-setting glue, simplifies the manufacturing process, reduces costs, and minimizes soiling, while ensuring secure bonding of the inner and outer shells.
Implementation Method 1
By locally heating the plastic film at the areas in contact with the thermo-adhesive coating, the adhesive power of said coating is activated
Implementation Method 2
the adhesive power of said coating is activated, which allows the plastic film to adhere to the outer shell
Implementation Method 3
heating and shaping the plastic film so as to form an internal envelope internally covering the external shell
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
The invention relates to a tub (10, 10'), in particular for packaging a food product, comprising: - an external shell (11) having at least one bottom wall (111) and at least one side wall (112), - an internal lining (12) formed of a plastics film internally covering the external shell (11), being in at least partial contact with said at least one side wall (112), the internal lining (12) being secured to said at least one side wall (112) in a plurality of adhesion zones (14) disposed on an internal face of said at least one side wall (112), characterized in that each of the adhesion zones (14) is entirely surrounded by a thicker portion of said at least one side wall (112).