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
• utside of the frame
• Ceramic insulation

is screwed to enclosure from the

• utside

• Two doors
• One at each end

allows the mould to pass through the

• ven 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 bricks be supported enough? Test with the real world prototype and add support if needed Are the ceramic bricks widely available enough to be sourced all across the world? Before fjnalising the design do some research in to how easily available the ceramic bricks are. Check on:

• Ask on Forums
• Check availability on online retailers
• What industries are common all across the world

What is the benchmark for a successful

• ven and how do you measure it?

Faster heating time (without compromising sheet quality) and better energy effjciency that the existing

• ven. Measured using energy meter and timer

Will the fan motor be efgected by the heat? Research what kind of motors domestic fan ovens use and test with the real world prototype. Adapt if needed Airfmow: How do you test if it is suffjcient enough? Would adding an enclosure around the fan allow you to control the direction of the heat? Can/Should the fan have the option to turn on/ofg independently of the heating elements? Testing methods:

• Check airfmow using smoke
• Check airfmow using paper
• Measure temperature at various points
• Inspect sheet quality
• Virtual analysis
• The fan should always be on to prevent elements from overheating

Add rollers to oven door. Test with the real world prototype and add if needed Would a smaller mould have challenges for rolling it out into the sheet press? Direct answer: No you could push it from the back side or use a rod with a hook to pull it through, as long as there is no more than half the width of the mould between the oven and the press bed 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 sheet press Direct answer: All ready being done where possible Add a safety bar to protect elements from fan Test with the real world and add if needed

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