Talk:Extrusion

message: The big addition to this article from a few months ago sure seems like a text dump from some book or another. --jpgordon∇∆∇∆ 02:33, 4 September 2005 (UTC)
thread_title:  the big addition... 

message: I think that plastics extrusion should be merged into this article. And it should either be referred to as "Polymer Extrusion" or "Plastic Extrusion", but not "Plastics Extrusion". --PrecisionEx 17:41, 15 September 2006 (UTC)
thread_title: Organization

message: I just removed an external link that i considered to be spam. Wikipedia is an encyclopedia, not a free source of advertising, not a link directory. Wikipedia is not for spam! Please do not link to external sites if they offer ABSOLUTELY NO educational value, or if your intentions are clearly only for promotional value of the linked site. This does not mean that you cannot link to 'commercial' sites, only that the linked site must contain relevant educational content that complements the article and contributes knowledge. You are encouraged to add content to wikipedia articles, but please read Wikipedia's tutorials and generally accepted practices in regards to editing articles. If you feel that the link was unfairly removed, please feel free to discuss it here. Thank you, --AnTony 04:25, 18 September 2006 (UTC)
replies: text: I just added a few links to sites that i consider to be relevant, content rich, and generally good sources of information. These sites being; Society of Plastics Engineers, eFunda - Extrusion, and Strictly-extrusion. --AnTony 05:05, 18 September 2006 (UTC)
replies: text: I can't even view Strictly-Extrusion without JavaScript, and WP isn't a directory to business associations like Society of Plastics Engineers, so removed them. Femto 15:52, 2 November 2006 (UTC)
thread_title: External Link Spam

message: The second paragraph of the Food section looks much like copy-and-pasted. There is a "course" mentioned that has obviously nothing to do with this article. --217.234.80.76 11:37, 12 May 2007 (UTC)
replies: text: Removed , thanks for pointing it outrefref. Femto 16:18, 12 May 2007 (UTC)

text: Right now there is an expansion template in the section. I know nothing about that application, but do you think it could still use more expansion? Wizard191 (talk) 15:03, 10 April 2009 (UTC)
replies: text: Definite need for more expansion. This technique is ever-growing in the food industry, but the public is hardly aware the process even exists. There is some resistance to this technique given its novelty, but in limited circles. I'm working on making this section more neutral and better-balanced presently. For example, I've toned down the buzzword-wizardry that was getting intermixed with the 'food benefits' of the process. E.g.: How does "starch gelatinization" stand as a remote benefit for a consumer? It doesn't. It's really only beneficial to manufacturers. I moved such terms up out of the benefit list. Ideally this food section should eventually have its own page. Koyae (talk) 14:48, 23 April 2011 (UTC)
thread_title:  Food section 

message: I removed the following because there isn't enough context. If someone can put it into context that would be great.
Extrusion is also a very important unit operation in shaping a catalyst. The shape of a catalyst is directly related to its working conditions. A high specific surface can be obtained by extrusion.
--Wizard191 (talk) 02:18, 6 May 2008 (UTC)
thread_title:  Catalysis 

message: "Painted" road markings are often done with extruded two- or three-component compounds. Thermoplastics are also common.
This is a low-pressure, high-flow process with very good contour and thickness control. Extrusion has more or less completely replaced the older "sliding mold" method. Benefits are much better economy, higher speed, and general appearance.
I don't think that this is actually a form of extrusion. I think it is closer to emulating something like a 2 part epoxy setup you might buy at your local hardware store.
--Wizard191 (talk) 02:31, 6 May 2008 (UTC)
thread_title:  Road marking compound 

message: I don't think so. To me there's plenty more important things that could (but for brevity purposes shouldn't be) be listed in the introduction such as the different types of extrusion processes (direct, indirect, hydrostatic). Wizard191 (talk) 01:19, 28 October 2009 (UTC)
thread_title:  Should hollow dies be introduced into the lead? 

message: This is WP:original research, so isn't suitable for the main article unless someone wants to find references, but I was looking into this for work, and found that the setup cost for a hollow aluminum shape with a 4 inch circumscribing circle was $1200.  With a minimum 200 lb lot charge of $800, the total was $2000 + tax.  Non-hollow shapes are cheaper.
The "generic" material is 6063 alloy, T5 heat treated.  Stronger 6061 is also common, but increases die cost and wear.  Of course, lots of other alloys can be used.  Almost-pure 1100 aluminum is soft and forms very well.
Production costs start at $4.00/lb (at 200 lb) and go down quite rapidly to $2.50/lb (at 1000 lb) with increasing quantities.  Aluminum is 2.7 kg/L, or 1.2 lb/in²/ft.
When considering the difficulty of an extrusion, remember that long thin parts of the die, corresponding to deep narrow grooves in the extrusion, are fragile and hard to support.  A long thin aluminum fin is easy to make; it's two in close proximity that is hard.
A screw channel in the extrusion (called a "screw boss" in the industry) is typically 5/6 complete and 1/6 open, and the larger the screw, the easier it is to make.  (E.g. #8 screws are preferable to #6.) 
Another thing that is difficult is thin walls.  Generally, 1 mm is the absolute minimum, and 1.5 mm the practical minimum.
The most important difficulty metric is the so-called "factor", the ratio of the perimeter of the shape (including interior surfaces, for hollow extrusions) to the diameter of the circumscribing circle.  Obviously, the minimum possible is π, for a round rod.  Generally, a factor below 20 is easy to make, 35–40 is difficult, and greater than 50, although still possible, is challenging.  ("55 is a pain in the ass.")
Within these limits, the die cost does not depend on the complexity of the shape.  An elaborately curved or ridged shape is the
same cost as a simple rod.  (Features below 1 mm in size are quite possible, as long as their aspect ratio is limited.)
Remember that die is usually cut slightly undersized, so the first parts made are somewhat thinner; as it wears the thickness of the parts increases.  Typically, it might be 0.05 mm undersized on all sides (0.1 mm thinner than designed) initially, growing to 0.05 mm oversized before the die is replaced.
In the aluminum extrusion business, standard custom is that the extruder keeps the die (they are specific to a particular brand of extrusion press, anyway), but is responsible for replacing it if necessary.
Useful references:
* http://www.jobshop.com/techinfo/papers/alumextpaper2.shtml
* 
* http://www.alexandriaextrusion.com/aec/engineering/technicalguides.cfm (particularly the "Designing with aluminum extrusions" and "Standard dimensional tolerances" articles.)
* http://www.alexandriaextrusion.com/aec/resources/solutions/aluminum_extrusion_tooling_advantages.cfm (reference on costs)
71.41.210.146 (talk) 20:31, 12 March 2010 (UTC)
thread_title:  Aluminum extrusion is surprisingly cheap! 

message: Aluminium solar Panels are widely use in Solar PV Modules  —Preceding unsigned comment added by Manishgade3 (talk • contribs) 12:38, 18 August 2010 (UTC)
thread_title:  Aluminium Solar Panels Profiles 

message: Current text is:
"A horizontal hydraulic press for hot aluminum extrusion (loose dies and scrap visible in foreground)"
But what is seen are not loose dies, but die holders (rings) and bolsters (support tooling). A loose die would be placed in the rings and backed up with bolsters.  — Preceding unsigned comment added by 194.178.102.226 (talk) 12:46, 18 September 2013 (UTC)
thread_title:  Picture description 

message: If anyone wants it for illustration purposes, the Sapa Group created Animation of aluminium extrusion process. 71.41.210.146 (talk) 08:23, 2 September 2015 (UTC)
thread_title:  CC BY-SA 3.0 licensed aluminum extrusion video 

message: We currently have "Joseph Bramah patented the first extrusion process for making lead pipe. It involved preheating the metal and then forcing it through a die via a hand-driven plunger." So far, so good. But i'm a bit wary of what follows: "The process was not further developed until 1820 when Thomas Burr constructed the first hydraulic powered press", since Joseph Bramah also invented the hydraulic press, and this Thomas Burr does not have his article here in WP. --Jerome Potts (talk) 22:40, 13 May 2016 (UTC)
thread_title:  History 

message: currently little more than a dictdef, so may be best WP:SPINOUT from the parent. Widefox; talk 00:53, 31 May 2018 (UTC)
thread_title:  Proposed merge with [[Reactive extrusion]]