Measures for pelletizing polypropylene size grain (Ⅱ)
Improvement measures for producing size grain in the pelletizing process of polypropylene
1. Suitable knife pressure and cooling water temperature:
The size of the knife pressure directly determines the quality of the particle size, the knife pressure is too large to make the cutter closer to the template, which aggravates the wear of the tool, and even produces a broken knife, and the knife pressure is too small and easy to produce the phenomenon of winding and pad knife.
The cooling water temperature is too low, the particle cooling speed is accelerated, which is easy to cause the mold hole blockage, and the temperature is too high, the cooling time is slightly longer, which may cause the situation of trailing and connecting the particles.
2. Timely change the PH value of the granulator and cooling water:
Chemical action, the acid and base of cooling water will have a certain corrosion effect on the blade of the pelletizer. In order to extend the service cycle of the tool, reduce corrosion, and avoid the sudden fracture of the tool during long-term use, the monitoring of the tool should be strengthened and the blade should be replaced in time. An appropriate weak base can also be added to the cooling water to make the PH more neutral and reduce the possibility of corrosion.
3. Carefully check the pelletizing hot oil tank:
The hot oil system often has problems such as deterioration and system fluctuation, which will affect the heating effect of the template, and the heating effect directly affects the temperature. It is more important to ensure the sealing of the filling tank, which can ensure the quality of the hot oil and the heating effect of the template, and can effectively inhibit the appearance of small and medium-sized particles caused by the problem of the template.
4. Strengthen daily monitoring and management:
In order to realize the appearance quality control of polypropylene particles, the inspection of particle type is strengthened in the production process. In the granulation sampling, the operator needs to carefully check the particles, if the particle size is uneven, timely notify the process and equipment personnel to check, adjust or replace the tool. At the same time, the particle size was checked. In order to strengthen the inspection work, once the particle size is found, the cutting tool and other process parameters should be adjusted in time.
5. Other:
Prevent mold hole clogging: timely cleaning, scraping mold inspection, timely replacement of template, control cylinder temperature, improve stirring intensity. Before driving, the template temperature should be properly increased to ensure that the opening rate of the die hole can effectively prevent unnecessary plugging of the die hole; Check the oil quality regularly and replace, clean up impurities in time; Control of formwork heating temperature and tool oil pressure; Use appropriate clearance values between the template and the tool, etc.
For different materials, SHJ knife have various solutions, if any request, please contact us, mailbox baikun@shungji.com.
