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Profile Extrusion Lines Measuring Instrument
- Jun 09, 2017 -

Profile Extrusion Lines Measuring instrument

(1) during work must wear work clothes, is strictly prohibited to carry any work-related debris, so as not to fall into the ingredients when the barrels. (2) do the preparatory work before the operation, all kinds of additives should be open package inspection, raw material code must be neat, orderly, condemnation. (3) for all types of raw materials, color, size, mobility (feel), the amount of the standard must be very clear. (4) different materials to use different precision measuring instruments. Dosage (such as stabilizers, impact modifiers, titanium dioxide, calcium carbonate, etc.) can be measured with an electronic scale with a precision of 10 g; small amounts (eg, processing aids, lubricants, masterbatches, Agent, etc.) must be measured with an electronic scale with a precision of 1 g. Metering deviation: CaCO3 ≤ 50 g, UV-531, antioxidant ≤ 0. 1 g, other materials ≤ 5 g. (5) strictly in accordance with the development of a good program operation, to prevent omissions or repeated measurement. (6) ingredients should be gently, not the material leaked to the ground or raised dust, pollute the environment. (7) electronic scales and other measuring instruments must be regularly checked, maintenance and inspection, found that the problem should be promptly handled or replaced. After the work must be cleaned up the adhesion of the material on the material, so as not to affect the accuracy of measuring instruments. (8) should be from time to time to review the quality of ingredients for the measurement of substandard raw materials should be treated as waste, can not be mixed with the already weighing raw materials.

(9) Each batch of ingredients to have a detailed record, including raw material grades, origin, ingredients, operators and so on. Especially the new plant into the raw materials, must be detailed records in order to verify its performance. (10) ingredients work is completed, all kinds of raw materials must be sealed and processed, and check the weighing dose and the remaining dose is consistent with the total amount of additives to prevent leakage or repeated ingredients phenomenon.

1. Mixing process on the one hand is the uniform dispersion of additives, on the other hand is to make the resin semi-gelation, gelation: PVC resin that is fine particles, uniform particle size changes, the formation of loose powder material. 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 feeding has an optimal value, if the amount of feeding too much, the material somersault resistance greatly affect the heating rate, resulting in lower speed, to the mix of adverse. The amount of less than the amount of internal shear heat is not reached, a long time to directly affect the mixing material 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, and the cold mix temperature is generally lower than 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. 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 slightly longer conducive to the uniform dispersion of materials. Generally in 7-8 minutes. But also by the mixing machine in the amount of feeding and feeding order.