Tobacco Stem Lamination for Small Diameter Cigarettes
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Solution Overview
Problem
Current methods for treating tobacco stems and leaf veins discarded by cigarette making machines result in products with physical features that are not suitable for producing cigarettes with diameters less than 6.5 mm or for hand-rolled cigarettes, leading to energy inefficiencies and waste, as these materials are typically rejected or reused only in reconstituted tobacco.
Innovation Solution
A method involving a moistening step to increase moisture from 35 to 85%, followed by immediate laminating to achieve a thickness of 0.07 to 1.7 mm, and then drying with hot air at lower temperatures to maintain moisture between 20 to 40%, without intermediate mixing steps, allowing the stems and leaf veins to be processed into cut tobacco suitable for smaller diameter cigarettes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If stems and leaf veins are treated by conventional moistening and laminating methods, then their density and structure are improved, but their physical features remain unsuitable for cigarettes with diameters less than 6.5 mm
Solution Approach 1:
The invention changes the physical parameters of stems and leaf veins through controlled moistening (increasing moisture content) followed by laminating at specific distances (0.4-0.8 mm) and drying at controlled temperatures. These parameter changes transform the physical features to match leaf characteristics, enabling use in small diameter cigarettes where previously only reconstituted tobacco could be used.
Solution Approach 2:
The method applies preliminary moistening and laminating treatments to stems and leaf veins before cutting and final processing. This preliminary action prepares the material by softening it through moisture absorption and compressing it to achieve desired density, making subsequent cutting and formulation possible for small diameter cigarette production.
2Device complexity
If stems are rejected or ground for reconstituted tobacco, then processing complexity is reduced, but material value is lost and energy efficiency decreases
Solution Approach 1:
Instead of discarding stems and leaf veins as waste or merely grinding them for reconstituted tobacco, the invention recovers their full value by applying a series of treatments (moistening, laminating, drying, cutting) that transform them into cut tobacco suitable for direct use in small diameter cigarettes. This recovery process eliminates the need for energy-intensive reconstitution while utilizing 100% of the discarded material.
Solution Approach 2:
The invention extracts stems and leaf veins from the waste stream and subjects them to a dedicated treatment process sequence. By separating these materials for specialized processing rather than mixing them with other waste streams, the method enables their transformation into a valuable product form suitable for premium cigarette applications.
3Manufacturing precision
If stems are subjected to extensive treatment to match leaf features, then product quality improves, but processing time and energy consumption increase
Solution Approach 1:
The treatment process is designed as a continuous sequence where moistening, laminating, and drying operations follow each other without interruption. Material moves continuously through the process line, with each stage preparing it for the next, minimizing idle time and maintaining productive action throughout the transformation from stem to cut tobacco.
Solution Approach 2:
The process employs periodic cycles of moistening followed by laminating and drying. These periodic actions allow the material to absorb moisture, be compressed to desired density, and then dried to achieve final physical properties. The cyclic nature of these operations optimizes both quality and processing efficiency.
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 enables the reuse of discarded tobacco stems and leaf veins, achieving physical features comparable to tobacco leaves, enabling their use in cigarettes with diameters less than 6.5 mm and hand-rolled cigarettes, while providing energy savings and maintaining mechanical properties.
Implementation Method 1
a step (2) of moistening said stems and/or leaf veins (1) such that said stems and/or leaf veins (1) have a moisture at the end of said step, which is measured on moisture basis, ranging from 35 to 85% and a volume which is greater than the initial volume thereof before said moistening step (2)
Implementation Method 2
at least one drying step (5) of said previously moistened and laminated stems and/or leaf veins (1), such that said stems and/or leaf veins (1) have a moisture ranging from 20 to 40% at the end of said step
Data Source
Figure 1
AI summary
An improved method for treating, preferably by the expansion treatment, the stems of tobacco and/or leaf veins (1) of tobacco, in particular those discarded by cigarette making machines,providing the sequence of the following steps: - a step (2) of moistening said stems and/or leaf veins (1) such that said stems and/or leaf veins (1) have a moisture at the end of said step, which is measured on moisture basis, ranging from 35 to 85% and a volume which is greater than the initial volume thereof before said moistening step (2), - at least one laminating step (4) of said previously moistened stems and/or leaf veins (1), such that the stems and/or the leaf veins have a thickness ranging from 0.07 to 1.7 mm at the end of the laminating, - at least one drying step (5) of said previously moistened and laminated stems and/or leaf veins (1), such that said stems and/or leaf veins (1) have a moisture ranging from 20 to 40% at the end of said step, and characterized in that : - said at least one laminating step (4) is carried out immediately after said moistening step (2), - said at least one drying step (5) is carried out immediately after said at least one laminating step (4).