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Belovac Vacuum Forming Machine (view source)
Revision as of 07:56, 26 November 2018
, 07:56, 26 November 2018no edit summary
This device can handle any thermoformable plastic up to 3/8" thick.
This device can handle any thermoformable plastic up to 3/8" thick.
Depending on which platen/frame that is used, the machine can accept ??? plastic sheets.
Depending on which platen/frame that is used, the machine can accept 3 sizes of plastic sheets. ?x?, ?x? and ?x? cm.
The "buck," or form, may be any sturdy shape that can tolerate a bit of heat. Wood, metal, and polyester resin work well. Avoid shapes with hollows underneath because they have a tendency to collapse. Shapes with undercuts, or shapes taller than they are wide, will be very difficult to remove from the formed plastic. Paint, shellac, or epoxy resin can cause the hot plastic to stick.
The "buck," or form, may be any sturdy shape that can tolerate a bit of heat. Wood, MDF, metal, and polyester resin work well.
Avoid shapes with hollows underneath because they have a tendency to collapse. Shapes with undercuts, or shapes taller than they are wide, will be very difficult to remove from the formed plastic. Paint, shellac, or epoxy resin can cause the hot plastic to stick.
The oven must be used only for vacuum forming. Please do not attempt to use this machine to dry materials or anything other than its intended purpose.
The oven must be used only for vacuum forming. Please do not attempt to use this machine to dry materials or anything other than its intended purpose.
This vacuum forming machine...
This vacuum forming machine...
===Troubleshooting===
===Troubleshooting===
How long does it take to heat the plastic sheet?
* This depends on which material and thickness is specified.
How do I know when the plastic is ready to form?
* Generally speaking it is necessary with any new material to establish the correct heating cycle. Plastic is ready to form when it becomes soft and pliable especially nearer to the clamping frame. This is known as glass transition temperature (Tg). Once you have established the time you can set the heater timer for accurate and repeated heating cycles.
Why is the plastic webbing on the mold?
* Material is too hot.
* Insufficient vacuum.
* Excess of material. Use reducing windows.
* Poor mold design.
Why can't I achieve good definition on the finished part?
* Material too cold
* Mold too cold.
* Insufficient vacuum.
* Insufficient vacuum holes in the mold
Why Is the plastic thinning over the mold when formed?
* Sheet cooled whilst forming.
* Mold design with insufficient draft angles.
* Too thin plastic gauge.
* Pre-stretch required.
* Plug assist required.
Why does the plastic bubble and pit when heated?
* Material is Hygroscopic which needs to be pre-dried prior to forming.
* Overheating.
* Mold or plastic sheet too dusty
Why does the plastic stick to the mould when I try to release?
* Mold not fixed on baseboard.
* Insufficient draft.
* Mold undercuts.
===Maintenance and Repairs===
===Maintenance and Repairs===