This thesis is concerned with the appropriate design of manufacturing technology for plastic program disc including the design of plastic printing technology. At the beginning of this thesis was made an analysis of requirements for manufactured device including selection of the most appropriate technology for its manufacturing – plastic injection. In the theoretical part are described all skills needed for designing and construction of the injection mould. Partial theoretical parts are concerned with the issue of plastic materials, tools and engines for injection, and of plastic printing technology. Practical part is concerned with description of design of each single system inside the injection mould including calculation. On the basis of these calculations was selected the appropriate injection engine. The end of the practical part is concerned with the selection of the appropriate engine for printing on the plastic device which is manufactured by the technology of plastic injection. For construction of the injection mould were applied normalities of the Hasco Company and the 3D CAD system Solidworks. The conclusion of this thesis achieves the technical- economical evaluation for manufacturing of designed plastic device.

The diploma thesis Rationalization technology of production tools is divided into two parts. The first part is focused on injection molding of plastic materials and analysis current status of production injection tools. The second part contains proposal of rationalization steps in the production process and evaluation of rationalization.

The outcome of my thesis is airy relief in the form of a spreaded Kyjov´s women's folk costumes. It is made up of embroidery and lace, which gets their original lightness without underlying substance.The white color, I have used, strenghts this feeling. All parts are printed by the ABS plastic. I follow the transformation of hand-made embroidery on the machine-made one with this. 3D printing is another entirely fictitious step for me. Just as the embroidery machine adjusts stitches according to their outline, as well as 3D printer has its own structure of applying material.

Study developed during the Master's degree studies of Mechanical Engineering deals with the use of recycled plastic in the injection molding and its influence on the mechanical properties of the mold. Examined product is used in the automotive industry as a connector body. The housing is manufactured from a plastic material, polyamide. The annual production volume of 3 000 000 pieces. According to tests specified in standard USCAR2 regrind influence on mechanical properties and dimensions was evaluated. After the technical evaluation of the project, research was also judged from economic point of view. In this task, savings with the different content of the recycled material during production was calculated. The final chapters justify change of properties and they are proposing the use of recycled materials in practice.

Background: Circular economy has received an increasing amount of attention and a move towards a circular economy recently became a top priority within the EU. The food industry contributes to a large amount of the anthropogenic greenhouse gas emissions. In spite of this few studies have explored circular economy in regard to grocery store companies. The lack of prior research in the area serves as a motivation to carry out this study.  Purpose: The purpose of this study is to describe and analyze how grocery store companies have developed their communication to influence their customers’ behaviors and influence the relationship they have with them. Research question: How has the communication regarding a circular economy developed within grocery store companies during 2014-2020? Method: A content analysis of Swedish grocery store companies’ annual reports and sustainability reports between the years 2014-2020 has been conducted. Qualitative coding was mainly used, but some quantitative elements occur. The coding emanated from the two themes plastic and food waste. Results and conclusion: This study shows that the grocery store companies’ circular communication have congregated as a result of changes in the social expectations. The companies have concretized the idea of a circular economy and have introduced their own initiatives to reach it. / Bakgrund: Cirkulär ekonomi är ett begrepp som blivit alltmer uppmärksammat. En övergång till cirkulär ekonomi är numera en av EU:s främsta prioriteringar. Matindustrin bidrar till en stor del av de antropogena utsläppen av växthusgaser. Trots detta finns det få studier som kopplar samman ämnena cirkulär ekonomi och dagligvaruhandel. Bristen på tidigare forskning motiverade att denna studie genomfördes. Syfte: Syftet med studien är att beskriva och analysera hur företag inom dagligvaruhandeln har utvecklat sin kommunikation om cirkulär ekonomi för att påverka sina kunders beteende och relationen de har med dem.  Frågeställning: Hur har kommunikationen kring cirkulär ekonomi utformats inom dagligvaruhandeln mellan åren 2014–2020? Metod: I denna undersökning har en innehållsanalys av aktörerna i den svenska dagligvaruhandelns års- och hållbarhetsrapporter mellan åren 2014–2020 genomförts. Främst användes kvalitativ kodning, men vissa kvantitativa inslag förekommer. Kodningen utgick ifrån begreppen plast och matavfall. Resultat och slutsats: Resultatet av denna studie visar att företagen inom dagligvaruhandeln utformat och ökat sin cirkulära kommunikation på liknande sätt som en följd av förändringar i samhällets förväntningar. Företagen har konkretiserat begreppet cirkulär ekonomi och presenterat egna initiativ för att uppnå det.

The city is a place of accumulation, production and reproduction of production resources and consumption of goods, but waste typically accumulates outside it. It falls out of our horizon physically and mentally. The waste we produce changes the landscape and transforms the processes on earth without most of us visiting the "places of transformation". The project works with the idea of redirecting the final phase of the production chain back to the place of consumption by producing elements of public space from municipal waste. The presentation of waste leads to an awareness of its amount and degree of consumption. At the same time, waste becomes something much more ambivalent, possibly useful or even beautiful.

Diploma thesis entitled Do you know what a fish will do when it runs up a hill? concerns the topic of industrial fishing. Formally, it is an installation that contains two parts. The first part is an oval object on which are attached mechanical fish, which form a moving flock. Using engines, they interact with each other and the viewer accompanied by the song. The second part includes three separate mechanical fish, which create a direct dialogue with the viewer. The installation is located in a white cube. The result is to give the impression that the fish are alive and, with the help of a human voice, get closer to the viewer. Title Do you know what a fish does when it runs up a hill? based on a child's joke. This sentence is characteristic of the topic, in that it is all nonsense. The fish do not run, do not move on land and do not even talk. An attempt at this joke to humanize fish is quickly over when you know the answer. Just clapping tells us how foreign this different world is.

During 2021–2022 a new school was constructed in Älmhult, Sweden, using a precast concrete framework. The sandwich walls for the building were produced by the precast manufacturer Torps Byggelement in Alvesta, Sweden. To connect the concrete layer a kind of sandwich connector made of glass fiber reinforced polymer (GFRP) was used that the manufacturer had no previous experience with. This graduation thesis was conducted to compare this GFRP connector system with a traditional system made of stainless steel. The two systems were designed for an identical reference sandwich wall and the two resulting walls were compared with regards to thermal properties, manufacturing process and costs for the manufacturer. The thermal properties were evaluated by modelling in a finite element analysis program that calculated equivalent thermal transmittance. Manufacturing was compared through an interview with employees at the precast manufacturer. Finally, costs were compared by summarizing the cost of components needed from each connector system. The results of the study showed a decrease of 6,7 percent in thermal transmittance when the GFRP connectors were used instead of stainless steel connectors. The thermal bridging effect of GFRP connectors was negligible. In terms of manufacturing, the GFRP connector that was studied was considered by the manufacturer to be preferable to the other system in some regards and equal in others. The total cost of components was considerably higher with GFRP connectors but increased value because of reduced thermal transmittance, reduced labour costs during manufacturing and possible reduction in isolation waste should be considered.

Plastic, including microplastic, is a common product in the society today and is starting to be more common in oceans where it can stay for a long time. Microplastic is defined usually in the size range five millimeter and smaller and together with the important Chao Phraya river in Bangkok, Thailand, the main subject of this paper is described. More clearly, the aim of this paper is to provide a first-hand quantification of microplastics flowing into the Chao Phraya River. Samples were taken at upstream, middle and downstream locations in the river with a pump-system and were then analyzed in a lab. The result showed an increasing load of microplastic entering the river from Bangkok, for example the result for size range five to one millimeter showed a six times increase of microplastic between the upstream and downstream point. / Plast, däribland mikroplaster, är en vanlig förekommande produkt i samhället idag och börjar bli allt vanligare i hav där det också kan stanna ett långt tag efter att det hamnat där. Mikroplaster definieras oftast med storleks intervallet fem millimeter och mindre och tillsammans med den viktiga floden Chao Phraya i Bangkok, Thailand, är huvudämnet för denna studie beskriven. Mer tydligt, målet för denna studie är att förse en första kvantifiering av mikroplaster som flödar in till Chao Phraya floden. Prover togs på platser som var uppströms, i mitten och nedströms på floden och sedan analyserades dessa prover i ett laboratorium. Resultatet som framkom visade på ökande belastning av mikroplaster i floden från Bangkok, exempelvis visade resultatet för storleks intervallet fem till en millimeter på en sex gånger ökning av mikroplaster mellan uppströms platsen och nedströms platsen. Ökningen som troligen kommer från innerstaden kan bero på olika faktorer såsom väder, stadens avfallshantering och användningen av engångsprodukter som är av plastmaterial. Således påvisar detta vikten av, bland annat, en fungerande avfallshantering.

Syftet med detta arbete är att jämföra tre kassar av samma typ som är tillverkade i olika material och undersöka vilken variant som är mest resurseffektiv ur ett livscykelperspektiv. En kasse tillverkad av återvunnen plast, en tillverkad av nyplast och en kasse tillverkad av konventionell bomull. Detta i och med att Sveriges regering har beslutat att införa en skatt på plastkassar som säljs i dagligvaruhandeln. Ett beslut fattat baserat på ett direktiv från EU att år 2025 ska varje person använda max 40 stycken plastkassar per år. För att undersöka detta utfördes en förenklad livscykelanalys samt att flera studier, från olika länder, som använt livscykelanalyser för att undersöka samma fråga analyserades. I den förenklade livscykelanalysen jämförs också bomullskassen med en bomullskasse som återvinns till 100%, båda tillverkade av konventionell bomull, för att se vad effekten blir av att återvinna material. Alla tidigare studier kom fram till olika svar där mängden gånger man behöver använda en bomullskasse för att den ska vara likvärdig en plastkasse, avsedd för engångsbruk, varierade mellan ungefär 50–150 gånger. Livscykelanalysen som utförs i arbetet och analyseringen av de olika studierna visar att en plastkasse kräver mindre resurser än en kasse tillverkad av bomull, men det visar också att det kan vara svårt att utföra korrekta livscykelanalyser utifrån realistiska scenarion. Så vad som kan se ut som rättvist ur perspektiv baserat på siffror kanske inte är rättvist ur ett realistiskt perspektiv. För att spara på de resurser som finns tillgängliga är det viktigt att inte förbruka resurser i onödan. Använd därför, oavsett material, en kasse så många gånger som möjligt och när det inte längre går att använda, återvinn den då så den kan hjälpa till och bidra till att det krävs mindre resurser för att få fram nästa produkt. / The purpose of this report is to investigate three similar bags made from different materials to see what is the most resource-efficient from a life cycle perspective. One bag made of recycled plastic, one made of new plastic and one bag made of conventional cotton. This is because the Swedish government has decided to introduce a tax on plastic bags sold in the grocery trade. This decision is based on a directive from the EU that in 2025 each person should use a maximum of 40 plastic bags per year. To investigate this, a simplified life cycle assessment was performed and several studies, from different countries, that used life cycle analyzes to investigate the same question were analyzed. In the simplified life cycle assessment, the cotton bag is also compared with a cotton bag that is recycled to 100%, both made from conventional cotton, to see what the effect will be if materials are recycled. All previous studies had different answers where the amount of times a cotton bag needs to be used to make it equivalent to a one-time plastic box, varied between about 50-150 times. Both the LCA that was performed and the analysis of the different studies shows that a plastic bag requires less resources than a bag made of cotton, but it also shows that it can be difficult to perform an accurate life cycle assessment based on realistic scenarios. So, what may look fair from a perspective based on numbers may not be fair from a realistic perspective. In order to not deplete the resources that are available, it is important not to consume resources unnecessarily. Therefore, regardless of material, use a bag as many times as possible and when it can no longer be used, then recycle it so it can help and contribute to the use of less resources for the next product.