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Design of a new toilet cistern for the replacement market
2006 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis was performed at Caroma (Industries Limited), Adelaide, Australia. Caroma is the leading manufacturers of toilets and bathroom accessories in Australia. One of their most popular products is the plastic toilet cistern, a cheaper alternative to the vitreous china cistern. Caromas plastic cisterns are very common in Australian homes and public bathrooms. All of their cisterns are manufactured at Caromas manufacturing plant in Norwood, Adelaide, where they also produce other plastic components such as valves and toilet seats. This project will be emphasizing on the styling of a new cistern and its design and it will consist of a tank, a lid, a connection plate and dual flush button setup. The main aim of this thesis is to present the product development and design of a new plastic cistern intended for the replacement market. The new cistern shall be big enough to cover the footprint of plastic cistern out on the market, Caromas own brands and other producers. Caroma has got more then 10 different models of plastic cisterns and they all got different footprints (the footprint is the wall area that the cistern covers). Some of the models are up to 30 years old and need to be replaced because of malfunction but also because of their old-fashioned styling. The old models are often very big and have got a big footprint. If a cistern has to be replaced the new cistern shall cover the footprint so that no marks, left by the old cistern, are visible on the wall and no further renovation is necessary. In order to optimize the required footprint, plastic cisterns were measured and charted. The product development started with brainstorming and an ITK, Identity Tool Kit. The ITK is used to get a general idea about what style was wanted. Three concepts were generated and presented to Marketing in Sydney. A concept was chosen by using systematic concept selection and after having had input from marketing. The result of the project is a new plastic cistern that covers the required footprint and has a style that goes well with contemporary bathroom design as well as with older. It has a slim shape and looks proportional. The cistern has also got a shelf feature that allows placing objects on top. The button setup is designed as a rocker and adds a new type of button to the Caroma product range. The new cistern design is presented with rendered CAD pictures and a full-scale prototype. A physical model is from a marketing point of view more convincing. It gives not only a visual experience but also a tactile. When designing the new cistern, manufacturability has been taken into consideration. Knowledge about the processes and manufacturing techniques has improved the design utilizing the properties instead of consider them as limitations. This project will hopefully give Caroma inspiration to start manufacturing a new plastic cistern design.

Place, publisher, year, edition, pages
Keyword [en]
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48402ISRN: LTU-EX--06/165--SELocal ID: 5da6ecf4-8391-47f0-af83-042f393856d0OAI: diva2:1021744
Subject / course
Student thesis, at least 30 credits
Educational program
Ergonomic Design & Production Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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