Annular Ram Pressing for Container Lid Sealing Compound
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Solution Overview
Problem
Existing methods for applying sealing compound to container lids often result in air pockets, which compromise the seal's elasticity, particularly at the transition between the lid base and wall, especially in Press On Twist-Off (PT) lids where the compound must cover a larger area.
Innovation Solution
A method and device using an annular press ram with inner and outer mold parts form an annular gap to press a ring-like structure of plasticized sealing compound onto the lid base and wall, ensuring the compound is pressed radially outward, preventing air pockets by guiding the compound through a narrow gap and applying it inversely from the base to the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sealing compound is pressed radially outward from the lid base onto the lid wall using a conventional press ram, then the sealing compound distribution area is improved, but air pockets form in the critical transition area between lid base and wall
Solution Approach 1:
The patent inverts the conventional pressing direction by pressing the sealing compound axially from the lid base upward onto the lid wall, rather than pressing radially outward from the wall. This inversion prevents air pockets from forming in the critical transition area between lid base and wall, as the compound is forced into the gap from below rather than being pressed against it from the side
Solution Approach 2:
The press ram is divided into two functional parts: an axial pressing section that presses the sealing compound from the lid base upward, and a radial pressing section that presses the compound radially outward onto the lid wall. This segmentation allows the compound to be distributed over a large area while maintaining seal integrity by eliminating air pockets through the axial pressing action
2Strength
If the sealing compound is pressed flat onto the lid base and wall, then the sealing compound adhesion is improved, but air inclusions are trapped in the transition area
Solution Approach 1:
The pressing direction is inverted from conventional radial pressing to axial pressing from the lid base upward. This inversion ensures that the sealing compound is forced into the gap between lid base and wall from below, achieving strong adhesion without trapping air inclusions in the transition area
Solution Approach 2:
The sealing compound is first pressed axially from the lid base to fill the gap and establish adhesion in the critical transition area, before the radial pressing action distributes the compound onto the lid wall. This preliminary axial pressing action ensures air inclusions are eliminated before the compound is spread radially
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 approach reliably prevents air inclusions, improves the distribution and adhesion of the sealing compound, and reduces viscosity through additional shearing, resulting in a consistent and effective seal across the lid's interior surface.
Implementation Method 1
the ring-shaped press ram being pressed between an inner molded part arranged radially inwardly of the press ram and an annular outer molded part arranged radially outside of the press ram and forming an annular gap to the lid base in the direction of the lid base onto the ring-like structure made of plasticized sealing compound
Implementation Method 2
a ring-like structure made of plasticized sealing compound being pressed flat onto the bottom of the lid and on to the bottom of the lid by means of an annular pressing die subsequent cover wall is pressed
Data Source
Figure 1~2
AI summary
The invention relates to a method for pressing a sealing compound on the inside of a lid for containers, wherein a ring-like product of plasticised sealing compound is situated on the lid base, said product being pressed flat onto the lid base and against the lid wall adjoining the lid base by means of an annular ram, wherein the annular ram is pressed in the direction of the lid base onto the ring-like product of plasticised sealing compound between an inner mould part, which is arranged radially inwardly from the ram, and an annular outer mould part, which is arranged radially outwardly from the ram and forms an annular gap to the lid base, wherein the plasticised sealing compound is pressed into the gap and radially outwardly through the annular gap onto the lid base and against the lid wall adjoining the lid base. The invention also relates to a corresponding device.