Surface Homogeneity of Injection Molded Parts

In this paper we are presenting a novel method for color inhomogeneity evaluation. We proved that this method has a higher than 95 % linear correlation coefficient if results are correlated with human visual evaluations.We applied this evaluation method to analyze the homogenization in the injection molding process, therefore we measured the homogenization properties of various solid phase masterbatches on injection molded parts. We tested the effects of the processing parameters of injection molding and analyzed various dynamic and static mixers as well. We have also measured the influence of the mold surface texture on the sensation of inhomogeneities on the part surface.We have carried out our tests on an injection grade ABS material using various masterbatches. The method was based on the digitization of the molded flat specimens. The images of these specimens were evaluated with an own developed formula using the CIELAB color space resulting high correlation with human visual inspections

The Effect of Masterbatch Recipes on the Homogenization Properties of Injection Molded Parts

Appearance is a key factor in most injection molding applications. Unfortunately, there is no widespread method to objectively test visual appearance, such as color inhomogeneity of the parts or other surface defects. We developed an evaluation method to characterize the color inhomogeneity of injection molded parts. First, we examined manufacturing conditions and masterbatch recipes and then the individual effects of the components and their interactions on homogeneity

Fish and other species were perished for soiling and economy clearing in Tisza river at latest decades

Water pollution and remediation options for multi-source contaminations in freshwaters are happening sometimes, particularly in River Tisza after the cyanide and heavy metals spills of Romanian origin in 2000. The eco-toxicological effects, degradation and bioaccumulation rates of heavy metals have been followed in the next two years. Here the aim was to follow the bioremediation program and present the renewed economy of River Tisza. High concentration of arsenic, lead, mercury and cadmium was measured in the periphython and sediments samples both of the Rivers Tisza and Szamos. International rehabilitation program was planned and accomplished. Here we demonstrate the renewed economy of Tisza with living flora and fauna after 20 years, and the birth of day of May-fly again

Tapasztalataink a szelektív LDL-aferezis kezeléssel

L

Successful plasmapheresis treatment of severe hypertriglyceridemia during late pregnancy

During pregnancy, physiologic hormonal changes provoke a significant increase in triglyceride levels. Genetic abnormalities of triglyceride metabolism and secondary factors may multiply the risk of severe lipid abnormalities. Although severe gestational hypertriglyceridemia can be a life-threatening condition for both mother and fetus, its optimal treatment has not been fully clarified. A 33-year-old woman at 37 weeks of her second pregnancy was admitted to our clinic. Her triglyceride level was 57.8 mmol/L. Abdominal pain, nausea, vomiting or any other complaints were not reported. She kept a fat-restricted diet, however her triglyceride level remained 41 mmol/L. Therefore we decided to perform plasmapheresis with a replacement of human albumin as a colloidal solution. Complications did not occur during the treatment. Plasmapheresis reduced her triglyceride level by 54.1% (to 18.8 mmol/L), and the patient delivered a healthy female neonate at 40 weeks. In case of significantly increased values, plasmapheresis is a fast, effective and safe method for decreasing triglyceride level even in the third trimester