Talk:Blow molding

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I agree - we need to combine "Blow Molding" and "Blow Moulding."

I prefer the spelling without the "U"! : )

Seing as there isn't a separate Wikipedia page for UK and US spelling, shouldn't this page show both, as Moulding is widely used elsewhere in Europe and around the world. —Preceding unsigned comment added by (talk) 11:32, 29 January 2008 (UTC)

Blow molding for under water toy[edit]

The part you wish to make can be needle blown. Where the blow air is passed through a needle to inflate the parison. After the part is removed from the mold the needle hole is very small and easy to plug with many types of adhesives. —Preceding unsigned comment added by (talk) 04:43, 11 July 2008 (UTC)

Since I know nothing (yet) about plastic manufacturing, I have a question. I want to make a small cheap toy that would be submerged all the time in water but it needs to float. Is blow molding or foam the way to go? I like the look of plastic over foam but I don't want it to leak. It won't be like a bottle with an opening. Must be sealed but hollow.

You can make it with blow molding process and seal it.

My company makes a dishwasher safe blow molded case, we glue a little plug in it. We have a history of decoys which float on water, we just heat the blow tube (the opening in the mold through which the air is induced) until it melts then apply pressure from a cooled piece of aluminium. Another option would be to roto-mold it, this would probably be the easiest, albeit a lengthier cycle time. Resins are poured into the mold, the mold clamped shut and rotated in an oven until the resin sets up and voila, a sealed, hollow part.

If you want it to be "Soft" as in bendable or flexable have it made with LDPE which isn't mentioned in the article. After the mold is closes and a needle enters the part for a set amount of time and blows air into the part the needle withdraws and a small set of in-mold pinchers pinch the needle hole close before the plastic is fully cooled so the part is water tight. Haack909 (talk) 00:45, 18 March 2009 (UTC)

Injection and stretch molding sections[edit]

The section on injection molding is a bit confusing, and seems to refer to a specific process in places, e.g. "There are three sets of core rods, which allow concurrent preform injection, blow molding and ejection". Also, the stretch molding section refers to injection molding as well. --Slashme 08:44, 14 August 2007 (UTC)

Disadvantages of blow moulding[edit]

With every other variation of plastic component production, there's information on the disadvantages of the technique. This page needs one too. —Preceding unsigned comment added by (talk) 17:42, 29 November 2007 (UTC)

Excessive capitalization[edit]

There is too much capitalization on headers that do not have proper nouns. Would someone bother to do them per WP:HEAD? I don't have enough time to do so. PotentialDanger (talk) 04:12, 5 June 2009 (UTC)

The last editor capitalized the headers, so I just reverted it. Wizard191 (talk) 21:07, 5 June 2009 (UTC)

Equipment for blow molding[edit]

The "Equipment for blow molding" section reads like it is copied directly from a machine manufacturer's sales brochure -- more so in its latter subsections that list very specific features of particular machines. Mercifully, the exact makes and model names are not quoted, but is there any real point in reciting all this? I'm tempted to essentially delete the entire section. –Henning Makholm (talk) 01:13, 11 April 2010 (UTC)

You are right, the whole section was a copyvio and I've removed it. Wizard191 (talk) 18:17, 13 April 2010 (UTC)

Copyvio note[edit]

I have commented out a large part of the "extrusion blow molding" section because it's a copyvio of A lot of the information is important, but it needs to be rewritten so that it's no longer a copyvio. Wizard191 (talk) 15:21, 31 May 2010 (UTC)

Copyright problem removed[edit]

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Update to page[edit]

I updated the page to improve clarity, add correct terminology and correct false information. I have 40 years experience in the field working for many machinery manufacturers and processes. — Preceding unsigned comment added by David Sage (talkcontribs) 12:04, 20 September 2013 (UTC)

Continuous film?[edit]

There should be a section on blow molding of continuous films. Anyone with experience with this?Hermanoere (talk) 23:12, 18 November 2013 (UTC)

Citation dead link[edit]

Citation #6 is a dead link (as of 1/7/15) and should be removed/replaced or the information re-cited: — Preceding unsigned comment added by (talk) 20:16, 7 January 2015 (UTC)