THERMOFORMING AND TROUBLESHOOTING GUIDE
Courtesy of Leroy M. Boser 574-370-2003
PREFACE……………………………………………………………………………………..1
DESCRIPTION OF VACUUM FORMING…………………………………………….1
VACUUM FORMING TECHNIQUES …………………………………………………..1
1. DRAPE FORMING – BOTTOM (Figure 1.) ……………………………………….1
2. DRAPE FORMING – TOP …………………………………………………………….4
3. PLUG ASSIST – BOTTOM (Figure 2.)…………………………………………….4
4. PLUG ASSIST – TOP …………………………………………………………………..6
5. SNAP BACK – TOP See figure 3. ……………………………………………………7
6. SNAP BACK – BOTTOM See figure 3……………………………………………..9
7. BILLOW FORMING – FEMALE (BOTTOM) See figure 4. ………………….10
<a title="The Thermoforming Guide" data-cke-saved-href="https://fyb3e2bclzn3p7wmo4d0xgw1-wpengine.netdna-ssl.com/wp-content/uploads/sites/2/2017/10/VACUUM-FORMING-MANUAL1.pdf%20target=" href="https://fyb3e2bclzn3p7wmo4d0xgw1-wpengine.netdna-ssl.com/wp-content/uploads/sites/2/2017/10/VACUUM-FORMING-MANUAL1.pdf%20target=" _blank"="" rel="noopener" style="box-sizing: border-box; background-color: transparent; color: rgb(66, 139, 202); text-decoration-line: none;">8. BILLOW FORMING – FEMALE (TOP)…………………………………………..12
9. BILLOW FORMING – MALE (BOTTOM)……………………………………….12
10. BILLOW FORMING – MALE (TOP) ……………………………………………13
11. ZERO GRAVITY ……………………………………………………………………..13
12. PREBLOW PLUG ASSIST FORMING………………………………………….15
13. TWIN SHEET FORMING (Figure 4.1) ……………………………………. …15
14. MATCHED-MOLD THERMOFORMING (Figure 4.2)…………………….18
15. FREE FORMING OR BUBBLE FORMING……………………………………18
16. HAND FORMING……………………………………………………………………20
DRAW RATIOS……………………………………………………………………………21
IMPORTANT CONCERNS IN VACUUM FORMING……………………………26
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