In the spun-melt nonwoven production line, the function of the melt filter is to use the pores of the filter screen or filter element to filter out impurities in the melt, provide clean melt for normal spinning, and protect the system. The spinning pump is safe and extends the service life of the spinning components. Spunmelt nonwoven production lines generally use double slide type or double plunger type melt filters. The melt filters of these two structures are non-stop filters with two filter devices. Normally, there are two They are used in parallel at the same time, but only one of them can be used in a short period of time to meet production requirements. Therefore, when the filter needs to be replaced, it can be replaced one by one. When the new filter is put back into the working position, another filter can be replaced.
The basis for switching the filter element of the melt filter is the pressure drop (pressure difference) of the melt filter. When the pressure before filtering is 3Mpa higher than the pressure after filtering (or according to design requirements), it is necessary to replace the two filters that have been put into operation. Generally, the filter in the upper position is replaced first. The steps to replace the double slide or double plunger melt filter are as follows:
1. Start the hydraulic screen changing system, prepare the spare filter, and use the operating device (handle or button) Exit the plunger (or slide plate, numbered A) at the upper position. The movement speed should be smooth and slow. Pay attention to the changes in pressure before and after filtering (it can also change according to the operating tone of the screw extruder), and adjust appropriately. operating speed.
2. When the plunger (or slide) exits to the marked position, it can exit quickly. After removing and cleaning the old filter, install the new filter in time and push the plunger (or slide) in. Before the plunger (or slide) reaches the marked position, you can quickly and continuously Advance. Before approaching the marked position, operate carefully and slowly until the plunger (or slide) is fully in the working position.
3. After A enters the working position, it needs to heat up for a period of time to reach the rated passing capacity. This time can be controlled at about 2 minutes, that is, it must be replaced after 2 minutes. filter below.
4. Use the same method to replace the other filter (numbered B). Due to the structural limitations of the filter, the difficulty of replacing the A and B filters is different. of.
5. When the screen replacement process fails and the production system is shut down, the downtime should be used to replace the filter in time to resume operation quickly. Generally, the skateboard type The filter is less difficult to operate than the plunger filter.
6. Stop the work of the hydraulic system, dispose of the waste filter, and clean up the site. </p
