Deep-drawn Paper Lid Embossing Wrinkle Prevention
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Solution Overview
Problem
Existing paper or cardboard lids for containers often suffer from wrinkles, leaks, and poor sealing due to vertical folds, requiring complex and expensive production measures, and they are typically made from multiple parts, making them costly and inefficient.
Innovation Solution
A deep-drawn lid made from renewable fibrous materials with a circumferential, downward-pointing edge and embossings that act as latching lugs, providing a smooth, wrinkle-free seal and stability, and a bead on the inner surface for improved stability and stacking, manufactured using a deep-drawing process that avoids wrinkles and kinks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paper or cardboard lids are manufactured using deep-pressing process, then the lids can be produced from renewable raw materials, but vertical wrinkles form in the edge area resulting in poor sealing
Solution Approach 1:
The patent changes the forming process parameters by using deep-drawing instead of deep-pressing, and introduces a specific embossing pattern with radial and circumferential elements that prevent wrinkle formation while maintaining sealing quality. The embossing geometry and distribution are optimized to control material flow during forming.
Solution Approach 2:
The patent uses composite paperboard material with specific fiber orientation and layer structure that combines the benefits of renewable raw materials with improved formability and wrinkle resistance during the deep-drawing process.
2Strength
If paper or cardboard lids are made from multiple parts, then the lids can achieve sufficient structural strength, but the production becomes complex and expensive
Solution Approach 1:
The patent merges multiple functional elements (lid body, sealing rim, reinforcement structures) into a single integrated paperboard component formed by deep-drawing, eliminating the need for separate parts and assembly operations while maintaining structural strength.
Solution Approach 2:
The patent segments the lid structure into functional zones (central lid area, circumferential sealing rim, embossed reinforcement patterns) that are integrated into one piece, allowing each zone to perform its specific function without requiring separate components.
3Manufacturing precision
If embossings are added to paper lids to prevent wrinkles, then sealing quality improves, but the manufacturing process becomes more complex
Solution Approach 1:
The embossing pattern is pre-formed into the paperboard material before the deep-drawing process, so that the wrinkle-preventing structure is already in place during forming, eliminating the need for additional post-forming operations.
Solution Approach 2:
The embossing step is merged with the deep-drawing process by using the same forming tooling to create both the lid shape and the embossed wrinkle-prevention pattern in a single operation.
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
The solution ensures a tight seal, improved stability, and cost-effective production of lids that can be easily stacked and centered, preventing deformation and sticking, while being environmentally friendly and suitable for various container shapes.
Implementation Method 1
When deep-drawing such a fibrous material, no creases or folds are created that would cause leaks. At most, defined embossing, which can also be in the form of longitudinal ridges, is foreseeable. Deep drawing in relation to the present invention refers to a classic deep-drawing process in which the material is drawn into a mold by means of negative pressure, or whether positive pressure, punches, or the like are used.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The lid (1) has a circulating downwardly directed edge (3) attached to a conic inner lid surface (2), where the lid is made of a paper or a paper-like material using a modified process or a deep-drawn process. Edge embossments (4, 5) extend horizontally or vertically and function as detents. The lid exhibits a round-, oval-, angular- or rounded off shape, where a height of the lid lies within a range of 8-20 mm. The embossments vertically or radially extend and are provided at transitions between the lid surface and a dome. The dome is formed as a stack assistance. An independent claim is also included for a method for manufacturing a lid.