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THERMOFORMING MANUAL and TROUBLE-SHOOTING GUIDE

A Guide to Thermoforming

THERMOFORMING AND TROUBLESHOOTING GUIDE

THERMOFORMING AND TROUBLESHOOTING GUIDE

VACUUM FORMING GUIDE

Courtesy of Leroy M. Boser 574-370-2003

Table of Contents

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
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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