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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

SecRePac - Strimlare för hushållsförpackningar

Schwartz, Sebastian, Runic, Pierre January 2014 (has links)
SecRePac is a household appliance that simplifies sorting of packaging such as milk, juice and yogurt containers. By shredding the packages SecRePac reduces its volume uptake both in the home and at the recycling station. This leads to minimization of both transports to the recycling stations and truck transport for emptying the containers at the recycling station.The greenhouse effect deteriorates and becomes worse and worse leading to extreme climate changes and natural disasters such as floods as an example. Carbon dioxide emissions are the major reason for this and at least 30 percent of all these emissions come directly from transports. In the EU carbon emissions has decreased in the past few years. But the levels are nevertheless far too high for a sustainable future and the need for ever- new solutions to reverse this negative trend...SecRePac is such a product! SecRePac aims primarily to families where mountains of old empty containers are a familiar sight because it’s boring and there's not enough time in everyday life to go back and forth to the recycling station. Usage of SecRePac saves the user time in everyday life and space at home and you will have more time to spend on other things. Main advantage of SecRePac is that it can minimize unnecessary truck transports significantly, thus making the user a good bet for both himself and our environment.
2

Konstruktionen av en strimlare för kasserat PLA : En maskinkonstruktion

Andreasson, Jens, Fredriksson, Jimmie January 2022 (has links)
Detta examensarbete har ämnat konstruktionen av en strimlare för att sönderdela kasserad PLA-plast från 3d-skrivarna i verkstaden på Mälardalens universitet. Målet med detta arbete var att underlätta återvinning men även möjliggöra återbruk av materialet genom att skapa nytt filament av den sönderdelade plasten som åter kan användas av 3d-skrivarna och därmed minska behovet av att köpa in nytt filament. För att planera detta arbete har projektgruppen använt sig av ett Gantt schema som skapades under arbetets tidiga fas.   Projektgruppens arbete har bestått av att utvärdera befintliga lösningar så som en granulator och strimlare för att sedan välja ut den bäst lämpade maskinen att konstruera för ändamålet. Under arbete utfördes även en fallstudie för att skapa en uppfattning om hur stor kraft som behövs för att sönderdela PLA-plast.   I detta uppdrag har projektgruppen använt sig av utvärderingsmetoden FMEA tillsammans med föreskrifter från arbetsmiljöverket för att konstruera bort eller minimera risker som kan orsaka skada på maskin och användare.   För att verifiera den framtagna konstruktionens hållbarhet har FEM analys använts i ett flertal fall med syftet att undersöka säkerhetsfaktorer och spänningsfördelningar under belastning.   Resultatet av detta arbete presenteras som en CAD modell i formen av en strimlare med tillhörande elektronik. Till största del möter den slutliga konstruktionen de förbestämda kraven specificerade av kunden med ett undantag gällande den önskade vikten som överskreds på grund utav den tunga snäckväxeln som implementerades i konstruktionen för att möta det utmätta kraftbehovet. Arbetet anses har skapat en grund för fortsatt arbete att byggare vidare på och vidareutveckla med nya idéer och lösningar. / This thesis consists of the construction of a shredder to shred discarded PLA-plastic from the 3d-printers in the workshop at Mälardalens University. The aim of this assignment was to ease the recycling process, but also enable the possibility to reuse the shredded plastic to make new filament that can be used by the 3d-printers and thereby decrease the need to purchase new filament.  To plan this project, the project group used a Gantt chart that was created during the project's infancy.   The work has consisted of evaluating existing solutions such as a granulator and a shredder in order to pick the best-suited machine to construct. During the assignment, a case study was also conducted with the aim of creating an understanding of how much force is needed to shred PLA-plastic.   In this assignment, the project group has used the evaluation method FMEA together with regulations from The Swedish Work Environment Authority to remove or minimize risks that can cause damage the machine or harm the user.   To verify the durability of the machine, FEM analysis was implemented in multiple cases with the purpose of examining safety factors and material stress under load.   The result for the work produced is presented as a CAD model in the form of a shredder together with the electronics. For the most part, the finished machine meets the pre-determined requirements except for the desired weight, which was exceeded because of the heavy worm gear that got implemented in the construction to meet the measured power demands. The work is considered to have created a foundation to develop further with innovative ideas and solutions.

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