MOULD OVEN To heat large fmat moulds as part of the sheet pressing - PowerPoint PPT Presentation

MOULD OVEN To heat large fmat moulds as part of the sheet pressing process

Why have we chosen to make an oven and not use a pizza oven? • Pizza ovens are not easily available in all areas of the world • Pizza ovens restrict the size of sheet we can produce

Key features and improvements from the last version (Pizza Oven) • Scalable • Air Circulation (less heating elements required) • Open at both ends • Removable internal structure • Fully insulated • Matches height of press

Construction Virtually prototype the build process of the mould oven before beginning physical construction

• Welded steel frame • Minimizing the welding to make the oven easier to maintain and disassemble at the end of its usage cycle

• Caster wheels on base • Potential improvement from feedback: It may be better for stability to have static base and forklift/pallet truck holes

• 3mm steel sheet to act as base bolted inside the steel frame

• Ceramic brick insulation • Potential improvement from feedback: Is it widely available enough to be sourced in all areas of the world?

• 1mm steel sheet enclosure • Bolted to the outside of the frame • Ceramic insulation is screwed to enclosure from the outside

• Two doors • One at each end allows the mould to pass through the oven in a single linear action

• When closed the doors create an almost fully insulated chamber inside of the oven (There are several small thermal bridges in the base)

• The oven will contain its own fan • At the moment we think the best place is in the bottom but both the direction and shape of fan blade need to be experimented with

• On the base plate there is a frame which stops the internal structure from moving • The fan and frame are secured from the underside of the enclosure

• The internal structure sits on top of the frame • Contains heating elements • Contains rollers and rail to guide mould • External assembly

• A drip tray sits underneath the rollers to protect the heating elements and base from spillage • Can be easily removed for cleaning

• The rollers are made from 22mm stainless steel tube • The roller tube is supported with a bearing with the same diameter as internal diameter of the tube

• A simple control box is secured to the side of the oven • It contains a PID, relay on/ofg switch, fuse and emergency stop

Topic Action Will the top layer of ceramic insulation Test with the real world prototype and add support if needed bricks be supported enough? Are the ceramic bricks widely Before fjnalising the design do some research in to how easily available the ceramic bricks are. available enough to be sourced all Check on: across the world? • Ask on Forums • Check availability on online retailers • What industries are common all across the world What is the benchmark for a successful Faster heating time (without compromising sheet quality) and better energy effjciency that the existing oven and how do you measure it? oven. Measured using energy meter and timer Will the fan motor be efgected by the Research what kind of motors domestic fan ovens use and test with the real world prototype. Adapt if heat? needed Airfmow: How do you test if it is Testing methods: suffjcient enough? • Check airfmow using smoke Would adding an enclosure around the fan • Check airfmow using paper allow you to control the direction of • Measure temperature at various points the heat? • Inspect sheet quality Can/Should the fan have the option to • Virtual analysis turn on/ofg independently of the heating • The fan should always be on to prevent elements from overheating elements? Add rollers to oven door. Test with the real world prototype and add if needed Would a smaller mould have Direct answer: No you could push it from the back side or use a rod with a hook to pull it through, as challenges for rolling it out into the long as there is no more than half the width of the mould between the oven and the press bed sheet press? How would it be protected from rust? Direct answer: Spray paint, heatproof on inside Ventilation Open for suggestion, current idea is one large hood above both press and oven Match components with those used in Direct answer: All ready being done where possible sheet press Add a safety bar to protect elements Test with the real world and add if needed from fan

Immediate actions • Immediate next steps (next two weeks) • Virtual analays on airfmow direction • Research avalablity of ceramic brick • insualtion • Produce price estimation list (With URLS) • Meet with several external oven specialists to review design