How to identify the proportion of nozzle material in plastic?
The melt index is detected by a melt flow rate analyzer. If the nozzle is added, the melt index will generally increase
This result has two conclusions: 1, with large ratio of feed back. 2, the molding process causes the plastic cracking phenomenon to be more serious. The following is a screenshot of the performance of the material. It is important to note that the same plastic has different data downstream of different test conditions, so it is necessary to refer to the test conditions on the physical chart.
It can be analyzed according to the melting point value (MFI/MI) of plastic material. Generally not to exceed the raw material index 30% judgment. Example: GE C1200 raw material MI value is 19., the judgment basis is: 19+19*30%=24.7, if the test result is more than 24.7 numerical value many, basically can judge the plastic performance not to be able to satisfy the request.
Generally within 15% is allowed; if the nozzle is too much will cause the following phenomenon: product strength decreased, brittle, easy to crack; cause accelerated aging
