PVC processing in color, in addition to the components of the native color impact, but also by the influence of processing rheological behavior.
Roughly divided into the following phenomena:
1, the color of the overall smooth slightly darker or lighter, no fluctuations in processing current.
The probability is that the stabilizer, GCC, resin and other raw materials of titanium dioxide color slightly fluctuating. Need to pay attention to the product batch problem.2, color fluctuations, suddenly yellow and suddenly white, accompanied by fluctuations in processing current.
Mainly due to material fluctuations or lubrication abnormalities.
Feeding fluctuations and lubrication abnormalities, can be observed from the host under the mouth and vacuum port parts. Under the material fluctuations, under the mouth of the material when more or less, the vacuum port material is also fluctuations. Lubrication abnormality mainly look at the vacuum port and the export model embryo observation, the vacuum port is in a completely unplasticized or completely plasticized, the embryo has no luster.
Causes of material fluctuations are viscous varieties, such as titanium dioxide, PCC certain varieties, add a larger amount, there will be material fluctuations.GCC material stability is higher, certain ores or equipment prepared by the fine powder, may also cause material fluctuations. Resin particles are finer, can also cause underfeed fluctuations.
Lubrication abnormalities can fluctuate from lubrication abnormalities mainly between stabilizer batches. Usually there is a lack of lubrication or excessive lubrication, and the overall rheological properties are marginal.
Solution:
1, find the cause, such as do not have professional conditions, seek professional partners to help.
2, with the help of professional equipment, such as rheometer test.
3, the product in addition to its own value, but also technical service support, future growth and other attributes.