EFFECTS OF EXTRUSION BLOW MOLDING INTERNAL COOLING ...

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1.3 Fasti System 1.3.1 Recirculating blow pin The purpose of the Fasti system is to internally cool the container. The most important feature of this technique is the continuous removal of hot air while the system simultaneously introduces cold air into the part. This process of cycling the air is achieved by using a recirculating blow pin. The blow pin can be easily engineered for the specific machine and application. The pin consists of a central exhaust pipe, which pulls hot air out of the bottle and a fitting which sends cold air into the bottle around the outside of the exhaust pipe (See Figure 5). In addition, small channels send air around the circumference of the blow pin externally at the cooling sleeve to cool the moil or top flashing. Figure 5. Recirculating Blow Pin Blowing of the bottle becomes a three-stage process with the Fasti system described below and shown in Figure 6. 1. The pre-blow phase uses chilled air through both blow pin channels to inflate the parison inside the mold as quickly as possible, while the blow 8
pin is entering the bottle finish. The high-pressure pre-blow process forms the container, forcing out ambient air between the mold and parison through the mold vents. The bottle is inflated and comes in contact with the water-cooled cavity surfaces, which promotes the cooling of the bottle. 2. The blowing phase is used to do the actual cooling of the bottle with cold air. Upon inflation of the bottle in the pre-blow stage, only a small amount of back-pressure is required to maintain contact with the mold cavity walls. During this stage, air flow through the center channel of the blow pin is reversed, allowing hot air to escape while cold air is blown in through the outer channel. Cold air entering the container forces the cold air out the center channel. This allows the cold air to circulate instead of trapping the hot air inside the container as with a conventional process. 3. Finally, the venting stage where the air pressure is balanced between the container and the outside. At this stage, the container will have cooled sufficiently to maintain its dimensionality. 9
Page 1 and 2: EFFECTS OF EXTRUSION BLOW MOLDING I
Page 3 and 4: Copyright by Kirk Alan Valko 2004
Page 5 and 6: TABLE OF CONTENTS LIST OF TABLES ..
Page 7 and 8: LIST OF TABLES Table 1. Fasti Cost
Page 9 and 10: Figure 24. Assembly Drawing........
Page 11 and 12: 1 - INTRODUCTION AND LITERATURE REV
Page 13 and 14: The process of extrusion blow moldi
Page 15 and 16: and dropped onto the conveyor, the
Page 17: Internal cooling is the process of
Page 21 and 22: 1.3.3 Costs Total cost of the unit
Page 23 and 24: Figure 7. Machine Surround Before F
Page 25 and 26: Table 2. Effect of Decreased Crysta
Page 27 and 28: 1.4.2 Wall thickness In addition to
Page 29 and 30: 2 - EXPERIMENTAL DESIGN AND TEST ME
Page 31 and 32: to determine the connection between
Page 33 and 34: 2.2 Experimental Methods 2.2.1 Samp
Page 35 and 36: Average temperature, checked by the
Page 37 and 38: Table 5. Bottle Body Dimension Tole
Page 39 and 40: D 2659, 1995). Twenty samples from
Page 41 and 42: Figure 15. Compression Data Example
Page 43 and 44: Figure 16. DSC Sample Pan Crimper T
Page 45 and 46: 3 - DATA AND RESULTS 3.1 Cycle time
Page 47 and 48: Table 7. Dimensional Test Result Co
Page 49 and 50: 3.3 Compression Strength Compressio
Page 51 and 52: Table 10. Percent Crystallinity of
Page 53 and 54: Table 12. Percent Crystallinity at
Page 55 and 56: wall thickness. Compression strengt
Page 57 and 58: performance tests. It would be desi
Page 59 and 60: 5.8 Optical Microscopy Optical micr
Page 61 and 62: 51 APPENDIX A Dimensional Results T
Page 63 and 64: 53 Table 15. Dimensional Test Resul
Page 65 and 66: Figure 18. Conventional Wall Thickn
Page 67 and 68: Figure 22. Fasti Wall Thickness 2 0
Page 69 and 70:
Table 18. Compression Test Results
Page 71 and 72:
Bekum Blow Molder Operating Instruc
Page 73 and 74:
a) “SP1”(set point one) tempera
Page 75 and 76:
i) Only one function may be used at
Page 77 and 78:
) Use Screwdriver to turn catch abo
Page 79 and 80:
Figure 25. Detail 01 - Adaptor 69
Page 81 and 82:
Figure 27. Detail 03 - Cooling Slee
Page 83 and 84:
Figure 29. Detail 05 - Tip 73
Page 85 and 86:
APPENDIX E Fasti Setup Experiment E
Page 87 and 88:
Data Analysis Figures 31, 32, and 3
Page 89 and 90:
Figure 31. Main Effects Plot for Fa
Page 91 and 92:
BIBLIOGRAPHY ASTM Standard D2463-95
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EFFECTS OF EXTRUSION BLOW MOLDING INTERNAL COOLING ...

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