How To Thermoforming Polystyrene Plastic Sheets

Importantly here is that the nature of the orientation of a polymer is affected by the rate of cooling of the plastic against the mold surface.

How to thermoforming polystyrene plastic sheets. Most thermoforming companies recycle their scrap and waste plastic either by compressing in a baling machine or by feeding into a granulator grinder and producing ground flake for sale to reprocessing companies or re use in their own facility. Many plastic sheet materials can be shaped by thermoforming. Simply put our plastic part is now oriented. Sheet temperature is one of the most critical elements of the thermoforming process.

Prototypes packaging soap and candle molds scale models theater props abs thermoform plastic sheets due to its low cost and superior physical properties abs acrylonitrile butadine styrene is one of the most popular thermoform plastics used for vacuum forming. The level of orientation is a function of the extent of stretching needed to push the part into various corners of the part 3. While it is the most basic method of thermoforming it s also quick and affordable. Polystyrene is a thermoplastic that s solid at room temperature but will begin to melt at 210 c.

Vacuum forming is used for large plastic pieces that don t need high levels of detail or sharp corners or edges. Styrene is also nontoxic and odorless with excellent forming properties. Recommended uses for styrene thermoform plastic sheets. Styrene plastic is a go to machinable plastic when high impact resistance and machinability are needed at a cost effective price point.

It is sheet temperature that dictates the process the end result being not just a better product but also decreased cycle time less scrap less floor space and reduced energy and labor costs. Styrene is commonly used in prototypes as it is dimensionally stable and easy to fabricate paint and glue. Essentially drape forming bottom is clamping a piece of sheet plastic in some type of clamping mechanism putting this material into a heating oven heating the plastic sheet up to a desired temperature retracting it from the oven draping it over a mold trapping the sheet just inside the clamping mechanism over the edge of the mold flange and applying a vacuum to the mold chamber. Then to achieve the ideal shape and design we use one of three methods to complete the thermoforming process.

Some plastics like hdpe and pp have narrower processing windows and lower melt strength which make them more difficult but not impossible to thermoform. This gives polystyrene almost the same amount of versatility as polyethylene. To do this large sheets of hips are heated and fitted over a custom tool. When we stretch a plastic in the forming press we orient the molecules.