Drilling deep holes up to 4m
We offer drilling of deep holes from fi10mm to fi150mm, maximum length: 4000 mm. A deep hole is classified on the basis of a depth to diameter ratio of at least 10:1 (at min fi 10mm). Deep hole drilling is used in many industrial applications, but its origin is derived from the need to drill very accurate and straight barrels, where the ratio of depth to diameter can exceed 20:1 and reach 100:1 (with max fi 150mm and length up to 4000mm ).
Sulfur vulcanization of rubber
Natural rubber is a naturally occurring material. It is made by trees, just like maple syrup. Trees produce latex, which is then processed into a useful natural rubber material. Natural rubber has been known for thousands of years. It was known to ancient civilizations such as the Incas, who used rubber to make balls for ancient sports. At that time, the biggest disadvantage of natural rubber was that it started to melt or stick when the temperature was too high. Natural rubber is a component of the milk sap of many species of dicotyledonous plants. Natural rubber is obtained from latex, an emulsion that exudes from the inner bark of rubber trees. The scientific name of the rubber tree is caoutchouc, which comes from the word caaochu meaning a weeping tree. Natural latex contains 30-35% rubber, 2-3% proteins and lipids, 0.3% resin and 1.5-4% glycosides. Coagulated rubber after separation and drying yields raw rubber. It is an isoprene (2-methyl-L,3-butadiene) polymer, with a molecular weight in the range of 300,000. Synthetic rubber is made from petroleum by-products by polymerizing 1,3-butadiene, chloroprene, isobutene, etc. Synthetic rubber refers to to virtually any man-made rubber material. Synthetic rubber mimics the desirable properties of natural rubber and is used in many of the same applications. There is a wide range of synthetic rubbers available on the market, many of which have unique performance characteristics that natural rubber does not. As mentioned earlier, the rubber at this stage is soft, sticky and thermoplastic. It has low tensile strength and low flexibility. It is easy to understand that, in essence, such rubber is a mixture of polymer chains of various lengths. Most importantly, it has no cross-linking at all and is therefore sticky and thermoplastic.
Food processing by extrusion.
Health and nutrition is the most demanding field in this era and will be in the future as well. Extrusion cooking has advantages over other food processing techniques due to its continuous process and high yield. The food extrusion process ensures the retention of nutrients due to the high temperature and short required residence time of the food in the extruder. The influence of the extrusion process on various food ingredients and the links between them are of constant interest to researchers. The use of extrusion to develop nutritionally balanced or fortified foods makes it necessary to study the nutritional value of extruded products.