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A parting line, or seam in moldmaking is the place where two or more parts of the mold meet.[1] Parting lines occur due to minute inherent gaps between two mating faces of halves of the die. The material filling into these gaps is generally called molding flash or simply flashing. Parting lines generally show up as a raised line around the product (witness mark) on commodity products such as toys.

Many applications (seals, tight running molded parts) that require precision for shape control, call for removal of flashes. Secondary operations are thus employed, in addition to high precision molding dies to remove these flashes. Many molders will repair or even replace the mold tooling so that the flash is reduced to an acceptable tolerance or eliminated altogether. Secondary operations to remove parting line flash include hand trimming, vibratory tumbling, media blasting and cryogenic deflashing.[2]

Flashes are known to improve sealing between mating faces in some instances (Fuel tank seals, hydraulic power steering gear, etc.), and thus flashes are permitted to some extent in special cases.

In engineering drawing, parting line is often abbrivated as PL. ASME's Y14.8 standard specifies a symbol for parting line.[3]


Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Parting_line — Please support Wikipedia.
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309 news items


Sun, 24 Aug 2014 22:31:12 -0700

First of all, the location of the parting line determines the direction of mold opening and, consequently, the direction in which features must be drafted for easy ejection. Second, it affects where any vestiges left by the mating surfaces of the mold ...

The Indian Express

The Indian Express
Sun, 04 Jan 2015 11:06:02 -0800

It was the last place you would have expected him to be. Only four days ago, he had left the cricket world gaping in shock after abruptly bidding adieu to the Test format apparently with nothing more than the parting line from Warner Bros, “That's all ...
Digital Journal
Mon, 12 Jan 2015 19:33:45 -0800

... repair, improvement and preventative maintenance encompassing CNC EDM technology, CNC machining technology, CADKEY design software, customized preventative mold maintenance programs and in-hour parting line repair utilizing CNC orbital ...


Wed, 03 Dec 2014 04:50:48 -0800

That shift, along with Malvolio's parting line forecasting revenge, encompasses the darker bite that underlies the humor of the entire play. Despite Claverie's scene-stealing performance, Allegra doesn't allow the subplot of Malvolio's gulling by Sir ...

The Age

Sat, 20 Dec 2014 16:38:10 -0800

And this is one of the reasons Castle has decided to share her secret. With the baldness edging across her parting line, it's becoming more difficult to camouflage and the inevitable questions will surface again, just as they did in 2010. "It's not ...

Wall Street Journal (blog)

Wall Street Journal (blog)
Tue, 11 Nov 2014 14:52:30 -0800

Will you clear up, in the next season, Tom's parting line “I was locked up for 4 months and never once told her about us.” That is definitely a story we are going to explore. Will we see more of Paul Reubens's character? I love Paul. Paul loves the show.
Today's Zaman
Wed, 17 Sep 2014 09:26:41 -0700

A parting line was running through the Muslim majority. As for the goal of secular Young Turk revolutionaries, it consisted of destroying the ancient regime, and those who were not fitting in the definition of “new” were doomed to destruction, exactly ...
The Republican - masslive.com
Wed, 08 Oct 2014 12:26:23 -0700

Not in the real world known as the private sector. But, of course, they would no be able to do that. In this economy pay raises are almost unheard of. They need a reality check or psychiatric help. I agree with POORboy14's parting line times 25,000 ...

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