Scrapless Forming Process

Dow s patented scrapless forming process is identified as the SFP process. An extruder produce a biaxially oriented sheet (Chapter 5). In turn the sheet is slit and cut into square blanks. These blanks are heated and pressed into circular disc with a lip. Immediately or latter after reheating, the disc is thermoformed into a shape such as a cup. 

Scrapless Forming Process" Technical Bulletin, The Dow Chemical Co., Bulletin S-303-74-76, 1976. 

Scrapless Forming Process (91-94) that is being developed by Cincinnati Milacron. An advantage of the latter process is that roimd containers may be made from sqnare blanks cut from sheet without the trim scrap normally associated with sheet forming. 

Anon., STP, Scrapless Forming Process, Dow Chemical Co., Midland, Mich., 1976. 

Scrapless forming process Super-high impact poly(styrene)... 

Figure 11. Coextruded sheet and container formed via scrapless thermoforming process.

---