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PP/PE three-layer co-extruded lithium battery separator castiPP/PE three-layer co-extruded lithium battery separator casting and stretching production lineng and stretching production line

Schematic diagram of the new dry-process lithium battery separator technology:

Regarding the new process for stretching lithium battery separators:
Key points of the new process:
The online heat treatment of the materials is carried out without the need for the oven step in the old process. After extrusion and compounding, it can directly enter the stretching machine.
Spool diameter:
In the new process, the spool diameter can reach 1000mm (for four layers), and it can be increased to 32 layers. In the old process, the spool diameter was only 550mm (for four layers), and it could only reach 20 layers.
Comparison Table of New and Old Processes:
| Oven pre-treatment | Unwinding diameter | Total number of floors | Spool length | Production line length | Product quality | |
| Old process | Required | 550 | 20 | 1 times | 27 meters | Generally |
| New process | Not necessary. | 1000 | 32 | 3.5 times | 55 meters | High |




PP/PE three-layer co-extruded lithium battery separator castiPP/PE three-layer co-extruded lithium battery separator casting and stretching production lineng and stretching production line

Schematic diagram of the new dry-process lithium battery separator technology:

Regarding the new process for stretching lithium battery separators:
Key points of the new process:
The online heat treatment of the materials is carried out without the need for the oven step in the old process. After extrusion and compounding, it can directly enter the stretching machine.
Spool diameter:
In the new process, the spool diameter can reach 1000mm (for four layers), and it can be increased to 32 layers. In the old process, the spool diameter was only 550mm (for four layers), and it could only reach 20 layers.
Comparison Table of New and Old Processes:
| Oven pre-treatment | Unwinding diameter | Total number of floors | Spool length | Production line length | Product quality | |
| Old process | Required | 550 | 20 | 1 times | 27 meters | Generally |
| New process | Not necessary. | 1000 | 32 | 3.5 times | 55 meters | High |









