Fem punkter til opmærksomhed i PVC -rørproduktion

2021-05-11

I produktionsprocessen,sidenPVC er enslagsvarmefølsomt materiale, selvom der tilføjes varmestabilisator, kan det kun øge nedbrydningstemperaturen og forlænge den stabile tid uden nedbrydning, hvilket kræver streng kontrol af PVC -støbningstemperatur. IsærtilRPVC,sidendets behandlingstemperatur er ofte meget tæt på nedbrydningstemperaturenresulterer i nedbrydningpå grund af forkert temperaturregulering. Derfor bør ekstruderingstemperaturen bestemmes i henhold til formlen, ekstruderegenskaber, matricestruktur, skruehastighed, temperaturmålepunktsposition, termometerfejl, temperaturmålingspunktdybde osv.



JEG.Temperaturregulering er en vigtig faktor ved ekstruderingsdrift. Kontrolfaktorer for ekstruderingomfattetønde temperatur, diameter temperatur og dør temperatur. Lav temperatur, dårlig blødgøring, kedeligt rørudseende, dårlige mekaniske egenskaberogproduktkvalitet, alledisse kan ikke opfylde kravene. If the temperature is too high, the material will decompose ogthe product will change color.


IJEG.With the increase of screw speed, the extrusion quantity will increase, so as to increase the output. However, it is easy to produce poor plasticization, which will lead to rough inner wall ogdecrease of strength. Feller dette problem, the head pressure should be adjusted to achieve the best output ogquality. The temperature control of screw affects the conveying speed, plasticizing ogmelting quality of materials. The extrusion pipe needs cooling water, ogreducing the screw temperature is conducive to improaf plastificeringskvaliteten. Temperaturen på skruen gennem kølevandet er omkring 50 ~ 70.


IIJEG.Derinde-extrusion operation, it is very important to adjust the traction speed. After the material is extruded, melted ogplasticized, it is continuously pulled out of the die head oginto the setting device, cooling device ogtraction device. The traction speed should match the extrusion speed. Generally, in normal production, the pulling speed should be 1% ~ 10% faster than the extrusion speed of the pipe.


IV.Compressed air can blow up the pipe to keep it round. The pressure should be enough. If the pressure is too low, the pipe is not round, if the pressure is too high, the spindle cools down, the inner wall of the pipe sprækkes ogis not smooth, ogthe quality of the pipe drops. At the same time, the pressure needs to be stable. If the pressure fluctuates, it is easy to produce sprækkei røret.



V.Different sizing ogcooling methods are used to extrude different plastic products. The cooling medium can be air, water or other liquid, ogthe temperature needs to be controlled. The temperature is mainly related to the production efficiency ogthe internal stress of the product.


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