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Zach Fredin
melt-blowing
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26965761
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26965761
authored
5 years ago
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Zach Fredin
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design and prototyping of a FabLab-able polypropylene melt blowing setup for distributed manufacture of filter media
## literature
dimensional analysis of process and discussion of nozzle types (1988): https://pubs.acs.org/doi/pdf/10.1021/ie00084a021
Exxon patent showing slot-style melt blowing nozzle: https://patents.google.com/patent/US3849241A/en?oq=3%2c849%2c241
## challenges
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primary air
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hundreds of SCFM, 200+ C, ??? psig
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tooling
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process control
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various temperatures
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air flow
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feedstock extrusion
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safety
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200 C + pipes and tooling: burn hazard
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Mach 0.5+ air: loud!
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fibers: Class III/Div 1 explosion hazard?
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feedstock
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recycled? pelletized virgin PP?
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heat + extrude + pump?
UTenn study on melt blowing: https://onlinelibrary.wiley.com/doi/epdf/10.1002/pen.760302202
good discussion of primary air system requirements: http://jmppnet.com/journals/jmpp/Vol_3_No_1_June_2015/9.pdf
## literature
-
dimensional analysis of process and discussion of nozzle types (1988): https://pubs.acs.org/doi/pdf/10.1021/ie00084a021
-
Exxon patent showing slot-style melt blowing nozzle: https://patents.google.com/patent/US3849241A/en?oq=3%2c849%2c241
-
UTenn study on melt blowing: https://onlinelibrary.wiley.com/doi/epdf/10.1002/pen.760302202
-
good discussion of primary air system requirements: http://jmppnet.com/journals/jmpp/Vol_3_No_1_June_2015/9.pdf
## melt blowing videos
video of a polypropylene filter melt blowing line in action: https://www.youtube.com/watch?v=cGQ4piMNQ_E
fast construction of a melt blowing line for covid-19 masks: https://www.youtube.com/watch?v=p9lchhBE7cE
a smaller line with a built-in rotary mask die cutter: https://www.youtube.com/watch?v=KgWHNQo7j1k
pilot-scale melt blowing machine making a mess: https://www.youtube.com/watch?v=SOFfpGnMjOc
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video of a polypropylene filter melt blowing line in action: https://www.youtube.com/watch?v=cGQ4piMNQ_E
-
fast construction of a melt blowing line for covid-19 masks: https://www.youtube.com/watch?v=p9lchhBE7cE
-
a smaller line with a built-in rotary mask die cutter: https://www.youtube.com/watch?v=KgWHNQo7j1k
-
pilot-scale melt blowing machine making a mess: https://www.youtube.com/watch?v=SOFfpGnMjOc
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