Paper-Industry Article for Continuous Perimetric Flange
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Solution Overview
Problem
Existing containers with paper-industry-based outer skeletons face challenges in welding the upper protective film due to wrinkled or discontinuous perimetric flanges, leading to ineffective or weak seals, which complicates packaging of food products in a controlled atmosphere.
Innovation Solution
A paper-industry article is designed to create a continuous, flat perimetric flange without wrinkled zones, allowing for easier welding of the upper protective film by forming a container with a continuous annular frame and wings that define the lateral and bottom walls, facilitating a seamless integration with the thermoplastic inner layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer skeleton is made with traditional paper-industry articles (single sheet or multiple flaps), then the container achieves mechanical stiffness, but the perimetric flange develops wrinkled zones or discontinuities that compromise welding quality
Solution Approach 1:
The paper-industry article is divided into multiple flaps (at least three flaps) that are connected along fold lines, allowing each flap to be independently formed and positioned. This segmentation enables the creation of a continuous perimetric flange without wrinkled zones, as each flap can be precisely controlled during the forming process to ensure proper alignment and contact with the thermoplastic layer for welding.
Solution Approach 2:
The paper-industry article is pre-configured with specific fold lines and flap arrangements before the container forming process. The flaps are designed in advance to meet at predetermined locations, ensuring that when folded and assembled, they form a continuous perimetric flange without gaps or wrinkles, thereby preparing the structure for high-quality welding operations.
2Ease of manufacture
If the perimetric flange is made continuous and flat without wrinkled zones, then welding of the upper protective film becomes easier and more effective, but the complexity of the paper-industry article increases
Solution Approach 1:
Instead of using a single complex continuous sheet, the flange is segmented into multiple flaps that are simpler to manufacture individually. These flaps are connected along fold lines and designed to meet at specific locations, creating a continuous appearance when assembled. This segmentation simplifies the manufacturing of each component while achieving the desired continuous flange structure for easy welding.
Solution Approach 2:
Multiple separate flaps are combined through folding and assembly to form a continuous perimetric flange. The flaps are designed to meet and join at predetermined locations, merging their individual structures into a unified continuous flange that provides the necessary surface for welding the upper protective film, thereby simplifying the welding process despite the multi-flap construction.
3Manufacturing precision
If multiple flaps are used to form the outer skeleton, then a continuous perimetric flange can be achieved, but the number of folding operations and assembly steps increases
Solution Approach 1:
The paper-industry article is pre-configured with all necessary fold lines and flap arrangements before the container forming process begins. The flaps are designed in advance with precise dimensions and fold line positions, allowing them to be quickly folded and assembled into the final configuration. This preliminary preparation reduces the complexity and time required during the actual forming and assembly operations.
Solution Approach 2:
The structure is segmented into flaps that can be independently formed and positioned, allowing for parallel processing and assembly. Each flap can be prepared and folded separately, then quickly assembled into the final container structure. This segmentation enables more efficient assembly compared to manipulating a single large continuous sheet, as multiple operations can be performed simultaneously on different flaps.
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 enables efficient and easy welding of the upper protective film, similar to thermoformed containers without outer skeletons, reducing production costs and equipment size while minimizing waste thermoplastic material and enhancing the mechanical stiffness of the container.
Implementation Method 1
inner layer of thermoplastic material which extends continuously at the bottom wall, the lateral walls and the perimetric flange
Implementation Method 2
the container is sealed at the top with a protective film, which is welded to the inner thermoplastic material
Data Source
AI summary
A paper-industry article for making an outer skeleton (3) of a container (2) which also includes an inner layer (9) of thermoplastic material and which has a bottom wall (6), a plurality of lateral walls (5) and an annular perimetric flange (4), the outer skeleton (3) extending at the perimetric flange (4), at the lateral walls (5), at the bottom wall (6), wherein the paper-industry article (1) includes a continuous annular frame (7) intended to constitute the outer skeleton (3) of the container (2) at the perimetric flange (4) of the container (2), and a plurality of wings (10) which extend starting from the continuous annular frame (7), each of the wings (10) being intended to constitute the outer skeleton (3) at one of the lateral walls (5) of the container (2), and at least one of the wings (10) also being intended to constitute the outer skeleton (3) also at the bottom wall (6) of the container (2).