Cigarette Paper Web Processing Installation
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Solution Overview
Problem
Cigarette paper processing faces challenges with residual stresses and creases due to starch solution application, limiting production speed and causing optical defects, which affect the quality and acceptance of smoking articles.
Innovation Solution
A processing installation and method that includes a gravure printing unit for applying a starch solution, followed by hot air drying, humidification, and subsequent contact drying to smooth out creases without warping, allowing for higher production speeds and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If starch solution or suspension bands are applied to the cigarette paper web for smoldering protection, then smoldering protection is achieved, but residual stresses and creases occur in the paper web
Solution Approach 1:
The patent applies a sizing composition to the entire paper web surface before the starch solution bands are applied. This preliminary sizing treatment creates a uniform base layer that prevents residual stresses and creases from forming during subsequent processing, while still allowing the starch bands to provide smoldering protection. The preliminary action of applying sizing composition beforehand eliminates the harmful effects without compromising the protective function.
2Ease of manufacture
If the paper web is cut after starch solution treatment, then cutting can be performed, but mechanical properties deteriorate and production speed is limited
Solution Approach 1:
The patent applies sizing composition to the entire paper web before the starch solution treatment and cutting operations. This preliminary treatment strengthens the paper web's mechanical properties, allowing it to withstand higher cutting speeds and maintaining integrity during processing. The sizing composition is applied in advance to prevent mechanical deterioration that would otherwise limit production speed.
Solution Approach 2:
The patent changes the physical-chemical parameters of the paper web by applying sizing composition, which modifies the paper's mechanical properties. This parameter change enhances the paper's strength and flexibility, enabling it to be processed at higher speeds through cutting and other operations without deteriorating mechanical properties.
3Reliability
If starch solution bands are applied to the paper web, then smoldering protection is provided, but optical quality deteriorates due to creases
Solution Approach 1:
The patent applies sizing composition to the entire paper web surface before applying the starch solution bands. This preliminary sizing treatment creates a uniform, crease-free base layer that maintains optical quality while still allowing the starch bands to provide smoldering protection. The preliminary action prevents the formation of creases that would otherwise compromise optical appearance.
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 method effectively smooths out creases and maintains paper quality, enabling higher production speeds and improved mechanical properties of cigarette paper without optical impairment.
Implementation Method 1
a first drying station, in particular a hot air dryer follows the printing unit in conveying direction, the dryer being intended to dry the print medium applied to the paper web
Implementation Method 2
a device for humidifying the paper web following the first drying station in order to humidify the paper web which at that stage contains the dried print medium
Implementation Method 3
a second drying station is disposed downstream the humidifying station in conveying direction, by means of which the humidified paper web is to be dried again
Data Source
AI summary
An arrangement for processing a paper web having a low surface area density not exceeding 70 g/m2, in particular a cigarette paper web, that may include in a conveyance direction: an input side, over which the paper web is fed into the arrangement; an output side, over which the paper web leaves the arrangement; a device downstream of the input side, in particular a printing unit, preferably a gravure printing unit, for applying a liquid printing medium to the paper web; a first drying station following the applying station in direction of conveyance, in particular hot-air drying, for drying the printing medium applied to the paper web; a device following the first drying in direction of conveyance for moistening the paper web and a second drying station following the moistening device in direction of conveyance, by which the moistened paper web is dried.