Segmented Rubber Rollers for Paper Web Extensibility
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Solution Overview
Problem
Existing methods for producing paper webs struggle to achieve high longitudinal and transverse extensibility without costly refining processes and face maintenance challenges due to high wear rates of rubber rollers, limiting production rates and machine dimensions.
Innovation Solution
An apparatus using a cylindrical metal roll with circumferential or spiral incisions and a rubber belt system, where the roll and belt operate at different velocities to achieve compaction and extensibility, allowing for high longitudinal and transverse extensibility without the need for high-density refining, and featuring a replaceable rubber belt for reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a rubber roller is used to compact the paper web at high production rates, then longitudinal and transverse extensibility are improved, but the wear rate of the rubber roller increases and maintenance becomes difficult
Solution Approach 1:
The rubber roller is segmented into a series of smaller rubber rollers arranged in sequence. Each smaller roller undergoes compression cycles at a lower frequency, reducing wear and extending service life while collectively providing the necessary compaction to achieve high extensibility (20% longitudinal, 15% transverse) of the paper web
Solution Approach 2:
The single-point compression by one large roller is transformed into distributed compression across multiple rollers arranged in series. This dimensional reorganization of the compaction process allows the same total compaction effect to be achieved with reduced stress on individual roller components
2Duration of action of stationary object
If the diameter of the rubber roller is increased to reduce compression cycles per minute, then roller life is improved, but machine dimensions become excessive and replacement becomes impractical
Solution Approach 1:
Instead of using one large-diameter roller (2500 mm or more), the system segments the compression function across multiple smaller rollers. Each roller has a practical diameter that allows for easy replacement in standard paper mills, while the series arrangement achieves the equivalent of reduced compression frequency
Solution Approach 2:
The system transforms the static solution of one large roller into a dynamic series of smaller rollers that can be independently replaced. This allows maintenance without shutting down the entire production line, improving operational flexibility
3Manufacturing precision
If costly refining methods are used to achieve high transverse extensibility, then transverse extensibility is improved, but production cost and energy consumption increase
Solution Approach 1:
The chemical and high-energy refining processes are replaced with a mechanical compaction system using rubber rollers. The elastic deformation and recovery of the paper web through the rubber roller nip provides transverse extensibility (15%) without the need for costly high-density refining or complex processing plants
Solution Approach 2:
The physical state and mechanical properties of the paper web are temporarily altered during passage through the rubber rollers. The elastic compression and subsequent recovery of the web fibers provide the desired extensibility through physical parameter changes rather than chemical refining
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 apparatus achieves paper webs with up to 20% longitudinal and 15% transverse extensibility, supports high production rates, and simplifies maintenance by allowing easy replacement and treatment of the rubber belt, enabling operation in standard papermaking plants with reduced downtime and costs.
Implementation Method 1
a rubber belt of a certain thickness maintained adhering to the heated roll along a certain portion of its surface
Implementation Method 2
it is subjected in the portion immediately downstream of the contact generating line to a longitudinal compaction linked to the water quantity contained, to the thickness of the rubber belt, and to the ratio of the diameter of the upstream transmission roller to the diameter of the heated roll
Implementation Method 3
at their contact generating line the rubber belt undergoes a sudden deviation and then a sudden variation in concavity
Data Source
AI summary
An apparatus for producing a web of fibrous material includes a roll having incisions with a depth of 0.01-2.00 mm, a width of 0.01-2.00 mm, and a pitch 0.01-10.00 mm, and rotated at a peripheral velocity v1 equal to the velocity of an upstream apparatus unit; a belt stretched between transmission rollers that advances at a velocity v2 less than v1, wherein v1/v2 lies between 1.05 and 1.40; a presser roller rotating at a peripheral velocity v2, associated with a presser system acting to press the belt against the metal roll with a pressure of 1-200 kg per centimeter; and a system that feeds a sheet of pliable fibrous material between the belt and the roll, the belt having a longitudinal elongation of no more than 5%, dimensional stability along its entire length, a thickness of 1-10 cm, and a hardness 24-70° Shore A.