Makeready Sheet for Die-Cutting Pressure Control
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Solution Overview
Problem
Existing flatbed die-cutting and embossing machines face inefficiencies in adjusting punching force distribution, leading to uneven pressure and increased setup times due to the need for manual adjustment of die-cutting tools, which results in low productivity.
Innovation Solution
A method to determine machine-dependent and order-dependent makeready requirements by subdividing the die-cutting surface into partial areas and recording the thickness of overlay strips and papers, using a scanner or manual entry, to calculate a makeready requirement profile, which can be used to create a makeready sheet for consistent pressure distribution and reduced setup times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of die-cutting knives with shimming is performed to achieve even pressure distribution, then die-cutting quality is improved, but setup time increases significantly
Solution Approach 1:
The system performs preliminary measurement of the actual pressure distribution using sensors before the die-cutting process. Based on these measurements, a makeready sheet with compensating overlays is pre-calculated and prepared, eliminating the need for time-consuming manual shimming adjustments during setup
Solution Approach 2:
The patent replaces the manual mechanical shimming process with an automated system that uses sensors to measure pressure distribution and calculates the required compensating overlays. This substitution of manual mechanical adjustment with automated measurement and calculation significantly reduces setup time while maintaining die-cutting quality
2Force
If punching force is adjusted globally across the entire platen surface, then overall pressure is improved, but local pressure distribution remains uneven
Solution Approach 1:
The patent divides the platen surface into multiple local measurement areas with sensors that independently measure pressure distribution in each region. The system then calculates and applies location-specific compensating overlays, ensuring that each local area receives the appropriate pressure correction rather than applying a uniform global adjustment
Solution Approach 2:
The system segments the platen surface into discrete measurement and control zones, each equipped with sensors and corresponding compensating overlays. This segmentation allows independent analysis and correction of pressure distribution in each zone, achieving uniform local pressure distribution across the entire surface
3Manufacturing precision
If die-cutting knives are individually shimed to compensate for pressure variations, then cutting accuracy is improved, but machine productivity decreases
Solution Approach 1:
The system performs all necessary pressure measurements and calculations for the makeready sheet preparation in advance, before production begins. The pre-calculated compensating overlays are prepared once and can be quickly applied, eliminating the need for repeated individual knife shimming adjustments during production runs
Solution Approach 2:
The patent creates a digital model or map of the pressure distribution across the platen surface based on sensor measurements. This digital copy is then used to calculate the optimal compensating overlay configuration, replacing the need for physical trial-and-error adjustment of each individual knife
Data Source
Figure 1a
Figure 1b
Figure 2~3
AI summary
The method involves dividing the total area of a contoured overlay sheet by a uniform grid into several partial surfaces. The position and thickness of side dressing tires and side dressing papers on a test strip are determined. The position and thickness determination process is repeated for majority of punching and/or embossing stations (2). The mean value of the thickness of the side dressing tires and side dressing papers in respective partial surface is obtained for determining side dressing demand profile. Independent claims are included for the following: (1) method for determining order-dependant side dressing demands of punching and/or embossing tool; (2) computer; and (3) method of creating contoured overlay sheet for punching and/or embossing station of flat-bed sheet punching and/or embossing machine.