Rubber Calender Detachment Table for Casing Cracks and Edge Defects
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Solution Overview
Problem
Recent rubber compounds used in tire casing manufacturing are less malleable, leading to appearance defects such as irregular thickness and width of lateral edges, as well as cohesion defects like cracks and fissures, which complicate storage and handling.
Innovation Solution
A calender with a separating table and scraper downstream of the profiling gap, equipped with hoops and pressing means to improve edge regularity and cohesion, and a detachment table with a scraper to prevent tension-induced defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recent rubber compounds are used for profiling, then the tire casing material properties are improved, but appearance defects and cohesion defects occur
Solution Approach 1:
A detachment table is introduced as an intermediary element between the profiling gap and the collection system. This detachment table with scraper prevents the molded mixture from adhering to the lower roller, eliminating tension and cohesion defects while allowing the use of improved rubber compounds without compromising appearance quality
2Reliability
If recent rubber compounds are used for profiling, then the tire casing material properties are improved, but cohesion defects like cracks and fissures occur
Solution Approach 1:
The detachment table acts as a mediator that interrupts the continuous contact between the molded mixture and the lower roller. By providing a separation surface with scraper, it eliminates the tensile stresses that cause cracks and fissures, thereby maintaining compositional stability while using advanced rubber compounds
3Device complexity
If the mixture is profiled without detachment means, then the profiling process is simpler, but the profiled mixture adheres to the lower roller causing defects
Solution Approach 1:
The detachment table with scraper is positioned downstream of the profiling gap to provide a separation function. This simple addition prevents the molded mixture from adhering to the lower roller, ensuring regular lateral edges without significantly complicating the overall profiling process
Data Source
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Figure 5~5A
AI summary
The invention relates to a calender (110) for profiling a rubber mixture for the manufacture of tyre covers, the calender (110) comprising three rotary rolls, the intermediate roll (114) and the lower roll (116) being separated by a second distance (d1) in the vertical plane (PV1), which second distance (d1) defines the height of a second profiling nip (124), wherein the calender (110) is characterised in that it comprises a table (170), for detaching the profiled mixture, which is positioned downstream of the second profiling nip (124) and prevents the cohesion defects that result in cracks and fissures in the profiled member exiting the calender.