the purpose of mixing: mixing PVC

1, the purpose of mixing: mixing PVC and additives according to the requirements of the formula after accurate measurement, in the high-speed mixer by hot mixing
cold mix to achieve a high degree of semi-gel, good fluidity, uniform and dense Dry mix.
2, mixing equipment: raw material conveying and storage part, measuring part, cassette conveyor, hot mixed cold mixed pot, dry mix storage and transportation part,
power fan and central control part.
3, the mixing process:
PVC storage tank PVC scale ultramarine
wheat flour mill machines made in China with ce approved
Auxiliary tank hot mixing cold mixing tank screening machine
Excipient scale accessories complex scale dry mixing tank
Micro-material tank micro-scale weighing the middle warehouse
Extruder hopper
4, mixing process: mixing process on the one hand is the uniform dispersion of additives, on the other hand is to make semi-gel resin, gel:
PVC resin that is fine particles, uniform particle size changes, Forming loose powder. Its process control points, feed capacity, cooling water temperature,
mixing temperature and time are key factors in controlling the quality and yield of dry mixes.
A, the amount of feeding and heating rate have a certain relationship, that is, the heat of the material in the hot mix is ​​only mixing the blade shear and material
produced between the heat production. So the amount of material has an optimal value, if the amount of feeding too much material to somersault resistance greatly affect
the heating rate, resulting in lower speed, to bring a negative mix. The amount of material less internal shear heat can not reach a long time to directly affect the mixing efficiency. The experimental control of about 70% for the best.
B, mixing temperature: the impact of mixing temperature of dry powder performance of one of the main factors. The hot mix temperature is generally about 120 ° C.
The cold mix temperature is generally below 40 ° C. The moisture content of the raw materials must meet the requirements of the quality products and should be
exhausted to remove moisture from the material.wfj 15 30 60 80 super micro mill flour mill machine
C, cooling water temperature: cold mixed cylinder cooling water temperature is usually controlled at 13 ~ 15 ℃.
D, mixing time: material experience compaction, homogenization and other processes need to have a certain time to complete.
Mixing time by the mixing temperature, the time is longer to facilitate the uniform dispersion of materials. Usually in 7-8 minutes.
But also by the mixing machine in the amount of feeding and feeding order. Mixing process is a direct impact on the degree of gelation of materials,
mixing effect is not good, set even the best extrusion process can not meet the requirements.