Driven Pressure Roller Synchronization for Battery Separator Films
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Solution Overview
Problem
In the production of battery separator films, pressure rollers used in longitudinal stretching systems often cause film defects due to uneven pressure and slipping issues, especially when dealing with oily films, leading to scratches and other surface damages.
Innovation Solution
A pressure roller arrangement with a driven pressure roller, where the rotational speed of the pressure roller is synchronized with the deflection or process roller, using either a direct drive mechanism or compressible contact sections to ensure consistent contact and prevent slipping, thereby maintaining film integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pressure roller presses the film against the deflection roller, then the film is evenly pressed and placed on the roller surface, but the oily film causes the pressure roller to slip and creates scratches on the film surface
Solution Approach 1:
The patent introduces a driven pressure roller that rotates in synchronization with the deflection roller as an intermediary solution. This driven roller acts as a mediator between the film and the deflection roller, preventing direct slipping contact while maintaining even pressure application. The synchronous rotation ensures the pressure roller surface moves with the film rather than against it, eliminating scratches caused by relative motion.
Solution Approach 2:
The patent changes the operational parameter of the pressure roller from stationary to rotating at synchronous speed with the deflection roller. This parameter change transforms the pressure roller from a static pressing element to a dynamically synchronized component, matching the film's motion and eliminating the harmful relative motion that causes surface scratches while maintaining even pressure distribution.
2Device complexity
If the pressure roller is kept stationary, then the structure is simple, but the oily film causes slipping and film defects
Solution Approach 1:
The driven pressure roller serves as an intermediary between the simple stationary structure and the reliable film processing requirement. By introducing the drive mechanism that synchronizes the pressure roller rotation with the deflection roller, the system maintains structural simplicity while achieving reliable film processing through coordinated motion that prevents slipping and defects.
Solution Approach 2:
The pressure roller is designed to rotate synchronously with the deflection roller, allowing it to self-adjust to the film's motion. This synchronous rotation enables the pressure roller to automatically match the film's speed and direction, preventing slipping and ensuring consistent pressure application without requiring complex external control systems.
3Reliability
If higher pressure is applied to prevent slipping, then the pressure roller maintains contact with the film, but the film properties are negatively influenced
Solution Approach 1:
The pressure roller is pre-configured to rotate at synchronous speed with the deflection roller before the film enters the pressure zone. This preliminary synchronized motion ensures that when the film contacts the pressure roller, there is no relative motion or slipping, eliminating the need for excessive pressure while maintaining stable contact and protecting film properties.
Solution Approach 2:
The patent changes the pressure parameter from high static pressure to dynamic synchronized pressure. By rotating the pressure roller at the same speed as the deflection roller, the system maintains reliable contact stability through motion coordination rather than force, thereby preserving film properties while ensuring consistent pressure application.
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 solution ensures that the film is evenly pressed and rotated in sync with the deflection roller, reducing the risk of surface damage and maintaining film quality by synchronizing the rotational speeds of the rollers, thus preventing slipping and ensuring consistent pressure application.
Implementation Method 1
The at least one contact and/or drive section (27) with a larger diameter than the roller diameter in the actual nip roller film pressure region has or have, at least in the unloaded state, a larger diameter than the actual roller diameter in the nip roller film pressure region
Implementation Method 2
The at least one contact and/or drive section (27) are provided with or consist of a material which is compressible under pressure
Implementation Method 3
the shell rotational speed of the pressure or nip roller is set in rotation by the frictional connection with the roller shell of the deflection or process roller
Data Source
AI summary
An improved pressure roller arrangement, in particular for a stretching system, and a corresponding method for operating such a pressure roller arrangement are distinguished, inter alia, by the following features:the pressure roller arrangement further comprises a drive device,the drive device comprises or consists of a direct drive (39) or an indirect drive.