Tear-Open Lid Punching Layout for Reverse Curl Production
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Solution Overview
Problem
In the production of tear-off lids, the punching or cutting pad is suboptimally produced on the outside of the lid ring when a 'reverse curl' is formed, and it is desirable to produce it on the inside to improve the manufacturing process.
Innovation Solution
The method involves positioning the die on the side that will form the inner side of the lid during later use and moving the cutting punch from the side that will form the outer side, allowing the punched pad to be conveyed by compressed air to a conveyor, with options for magnetic or vacuum conveyor belts, to achieve the production of the cutting pad on the outside of the lid with minimal changes to the method sequence and system concept.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the punching tool is configured to produce the cutting pad on the outside of the lid ring, then the manufacturing process is simpler and requires fewer modifications to existing systems, but the manufacturing quality is suboptimal when a reverse curl is formed
Solution Approach 1:
The patent applies inversion by reversing the conventional punching configuration: instead of placing the die on the outside and punch on the inside (which produces pad on outside), the die is placed on the inside and punch on the outside, enabling the punched pad to be produced on the outside surface while maintaining optimal manufacturing quality for reverse curl configurations
Solution Approach 2:
The patent introduces a pneumatic conveyor system that uses compressed air to transport the punched pad through the die to a collection conveyor. This pneumatic mechanism enables efficient removal of the pad from the tool area without complex mechanical systems, resolving the contradiction by maintaining simplicity while improving manufacturing quality
2Reliability
If a magnetic conveyor belt is used to convey the punched pad, then the handling and removal is more reliable, but the device complexity increases
Solution Approach 1:
The patent employs pneumatic conveyance using compressed air to transport the punched pad through the die to a collection conveyor. This pneumatic system provides reliable handling and removal of the pad without requiring complex magnetic conveyor belts, thus maintaining device simplicity while ensuring operational reliability
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 allows the production of tear-off lids with the cutting pad on the outside, enhancing the manufacturing efficiency by minimizing modifications to existing systems and ensuring reliable handling and removal of the punched pad with reduced energy consumption and space requirements.
Implementation Method 1
the punched pad can be conveyed by compressed air through the die to a conveyor (33) by means of which it is removed from the tool area
Implementation Method 2
especially if a magnetic or vacuum conveyor belt is used as a conveyor for removing the punched pad from the tool area
Implementation Method 3
especially if a magnetic or vacuum conveyor belt is used as a conveyor for removing the punched pad from the tool area
Data Source
AI summary
A method for manufacturing a tear-off lid (27). A lid blank (9) is punched with a punching tool (1, 5) having a die (6) and a cutting punch (2, 3) to form a lid ring (8) with a central removal opening (17) surrounded by a sealing flange (18). The edge of the removal opening (17) is then formed by drawing to a collar (20) projecting from the sealing flange (18) on the intended inside of the lid (underside), the collar (20) is rolled up at its free end and a tear-off foil (24) is sealed or glued onto the sealing flange (18) on the intended outside of the lid (upper side).In accordance with the invention, the die (6) is arranged on the inner side (bottom) of the lid and the cutting punch (2, 3) is moved into the die (6) from the outer side (top) of the lid while punching out a punched pad (16) and the punched pad (16) is conveyed by compressed air through the die (6) to a conveyor (33) by means of which it is removed from the tool area.It has been shown that by this measure the known and established processes and devices for the production of tear-off lids can be modified with very little effort in such a way that during the punching of the lid blank (9) the punching or cutting pad is produced on the intended inner side (underside) of the produced lid ring (8), which is desirable when producing lids with “re-verse curl”.