Date: Fri, 15 Oct 1993 05:54:44 -1000 From: andrew@tug.com (Andrew Beattie) Message-Id: Organization: /usr/lib/news/organisation Subject: Re: Carrington sritter@umi.com (Sam Ritter x3111) writes: >jeffy@syrinx.umd.edu (Jeffrey C. Burka) writes: >>puc@aber.ac.uk (Paul Crowley) writes: >>>Just to let you know to be very careful when hot-cutting Carrington >>>ripstop. A local paragliding Co. are prevented by legislation from >>>hot-cutting canopies as the heat generates micro-fractures. >>While I can understand this being an issue when you're talking about a >>paraglider and therefore someone's life, is it really important with a >>kite? I've made two kites out of Carrington so far and have hot cut all my >>pieces, including the extensive appliques (the red tracer and blue 3/4 >>tracer that are in the archives). I've not had *any* problems with the >>fabric and both kites have flown in winds well above 20mph. >What would I be looking for?? "Micro fractures" is a new term for me at >least applied to fabric. I can understand what a fracture is when we are >talking about something stiff like framing materials. Before this gets out of hand, may I suggest that a micro-fracturing is the chemical term for taking long stable molecules of stuff like nylon and smashing them up at high temperature into toxic fumes. (ie: the danger is to the people doing the cutting, not the pilot) (I've mailed Paul for confirmation) Andrew -- Work: gaffer@rec.com Phone: +44 793 614 110 Fax: +44 793 614 297 Play: andrew@tug.com Phone: +44 256 464 912 Car: +44 831 527 614 Interested in kite traction? mail kites@tug.com = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Date: Fri, 15 Oct 1993 09:01:01 -1000 From: fataq@cc.usu.edu Message-Id: <1993Oct15.130101.2014@cc.usu.edu> Organization: Utah State University Subject: Re: Carrington In article , andrew@tug.com (Andrew Beattie) writes: > sritter@umi.com (Sam Ritter x3111) writes: >>jeffy@syrinx.umd.edu (Jeffrey C. Burka) writes: >>>puc@aber.ac.uk (Paul Crowley) writes: >>>>Just to let you know to be very careful when hot-cutting Carrington >>>>ripstop. A local paragliding Co. are prevented by legislation from >>>>hot-cutting canopies as the heat generates micro-fractures. Stuff deleted >>What would I be looking for?? "Micro fractures" is a new term for me at >>least applied to fabric. more stuff deleted > > Before this gets out of hand, may I suggest that a micro-fracturing is > the chemical term for taking long stable molecules of stuff like nylon > and smashing them up at high temperature into toxic fumes. (ie: the > danger is to the people doing the cutting, not the pilot) > > (I've mailed Paul for confirmation) > > Andrew > -- Just guessing, but microfracturing probably occurs when the fused synthetic is thick enough to be brittle and crack- this would then contribute to weakening the fabric at the crack in the fused material and possibly be the source of rips in the fabric. Don Fiesinger Geology Dept. Utah State Univ. Logan, UT 84322-4505 FATAQ@cc.usu.edu = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =