Cigarette Inner Wrapper Embossing Length Control
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Solution Overview
Problem
The challenge in producing cigarette inner liners is that the length of the material web changes unpredictably due to embossing, making it difficult to position embossings correctly relative to the cutting process, as it depends on various factors such as material, roller wear, embossing depth, and environmental conditions.
Innovation Solution
Varying parameters like embossing pressure and web tension, and using sensors to detect print or embossing marks to adjust these parameters, ensures precise control over the length of the material web and blanks, allowing for consistent positioning of embossings and markings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the material web is embossed to create markings and logos, then the aesthetic quality and branding of the inner liner is improved, but the length of the material web changes unpredictably causing mispositioning relative to cutting marks
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting embossing pressure and web tension during the embossing process. The control system modifies these parameters based on detected web length variations, allowing the embossing depth and pressure to vary along the length of a blank to compensate for unpredictable web shortening and maintain precise positioning relative to cutting marks
Solution Approach 2:
The patent implements feedback control by using sensors to detect the positions of print marks or embossing marks on the material web, comparing detected positions with target positions, and automatically adjusting embossing parameters through a control system. This closed-loop feedback mechanism corrects web length variations in real-time, ensuring consistent positioning precision
2Manufacturing precision
If the embossing depth and pressure are increased to improve marking visibility, then the embossing quality is improved, but the web shortening effect increases making length control more difficult
Solution Approach 1:
The patent resolves this contradiction by dynamically varying embossing parameters along the web length. The control system adjusts embossing pressure and depth based on position, applying higher pressure where needed for visibility while compensating for the resulting web shortening through parameter modulation, thus maintaining both embossing quality and length control
Solution Approach 2:
The patent applies dynamics by making the embossing process adaptive rather than static. The embossing pressure and depth are continuously adjusted during the process based on real-time feedback about web position and detected length variations, allowing the system to optimize embossing quality while compensating for length changes on-the-fly
3Productivity
If the machine speed is increased to improve productivity, then the production output is improved, but the web tension and embossing consistency become more difficult to control
Solution Approach 1:
The patent uses feedback control to maintain manufacturing precision at high speeds. Sensors continuously monitor web position and embossing quality, and the control system automatically adjusts embossing parameters and web tension to compensate for variations introduced by high-speed operation, ensuring consistent results without sacrificing productivity
Solution Approach 2:
The patent applies dynamics by making the embossing system adaptive to speed variations. The control system dynamically adjusts parameters based on actual operating conditions, allowing the system to maintain precision across a range of speeds and enabling higher productivity without compromising quality
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 method allows for precise adjustment of the embossing parameters to maintain the desired length and positioning of embossings, ensuring accurate separation and packaging of cigarette inner liners, even under varying conditions.
Implementation Method 1
the material web is passed through an embossing device with embossing rollers, which are used to apply the embossing(s)
Implementation Method 2
The circumference of the embossing rollers corresponds to the length of a blank, so that exactly one blank is processed during one revolution of the embossing roller
Implementation Method 3
the length of the blank is checked following the embossing device using markings applied to the material web or the blank, in particular print marks or embossing marks
Data Source
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AI summary
The invention relates to a method for producing blanks (14) for an inner wrapper of a cigarette group. The blanks (14) are severed from a continuous material web (27). Before the blanks (14) are severed, the material web (27) is guided through an embossing device (24) and provided with an embossment (22, 23). The invention is characterised in that, in order to control a change in the length of the material web (27) or of a blank (14) to be severed from the material web, which change in length accompanies the embossment (22, 23), at least one parameter that influences the embossment (22, 23) is varied.