Month: May 2020

Network Sewers

The spill has come through the network of sewers in the municipality of Culleredo, through a change that was parked in a service area. The vehicle had a leak, which could be a sabotage to manipulate the valve of the tank. The Xunta has activated the territorial plan of contingencies for maritime pollution. A spill of more than 30,000 liters of kerosene has forced to close this Friday the estuary of O Burgo, in A Coruna, to the shellfish, precisely the day that opened a campaign afloat, for which licensed 44 boats. The spill, about 33,000 litres and that has come to the estuary through the network of sewers in the municipality of Culleredo, comes from a truck that was parked in a service area of the AP-9 and occurred during the early morning hours.

About 08: 00 hours the Guardia Civil in this town contacted emergency services to request it to mobilize the media before a major spill of kerosene whose destination was the Alvedro airport. The driver of the truck gave the voice of alarm to check that the truck had a leak and has denounced that the loss could be due to sabotage to manipulate the valve of the tank, which contained 36,000 litres of kerosene, of which around 3,000 remain in the tanker. The Xunta immediately activated the territorial marine pollution contingency plan and has proceeded to the deployment of barriers to enclose the pollution stain and prevent spread by ria. The Minister of the sea, Rosa Quintana, who has visited the area of the spill, announced that the results of the analysis to be carried out next week in the waters of the estuary will determine the date of its reopening to the shellfish. Quintana pointed out that talk of this landfill can give to fret with the seafood campaign in La Coruna Vigo or set a date for its reopening would be to anticipate events, and has emphasized that we must first wait the result of the tests that will be carried out next week and will be announced at mid month.

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Manufacturing Technologies

Final introduction of the 1980s emerged a variety of manufacturing technologies known as Rapid Prototyping and Manufacturing (RP & M). These new technologies can generate physical objects from a computer model created in a CAD system. All these technologies have in common an important fact, the generated object is obtained by adding material, not deleting. This is because they are based on the techniques of manufacturing layered (Layer Manufacturing Technologies). The ability of visualization of three-dimensional designs, the decrease in the time required to produce prototypes, the reduction of costs associated with the Elimination of redesigns in the early stages of design, geometric freedom, parts are some of the advantages offered by these processes. However one of the disadvantages posed by materials of sintered is that the material in powder not sintered during the process can be reused only a limited number of cycles, since during the phase of warming in the camera of sintered, said material it loses properties and is discarded. The material remains at a temperature near the melting for more or less long depending on the size of the piece to build. This makes some fractions of the polymer are decomposing and some additives will degrade.

This material is mixed with Virgin material in a certain proportion however after about 15-20 cycles is discarded, with the consequent economic cost that this entails, and the environmental impact that generates. In order to obtain a more efficient use of the material in order to minimize their consumption and optimize the frequency of replenishment of the Virgin material has been developed a systematic method for determining loss of properties and its potential for reuse. This methodology is based on the determination of the MFI of the material not sintered during the process of SLS. Previous studies claim that the MFI is quick and simple method for measuring the pace of degradation of dust due to the SLS process.

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