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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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Mon, 02 Mar 2015 06:21:46 -0800

She's a nurturing big sister who leads by example, and at going-on-17 years old, she's pretty cool about the fact that the highlight of her social life is an expensive puppet show. But then again, Rolfe. Parting line: “I'd like to stay and taste my ...
Mon, 02 Mar 2015 15:15:00 -0800

–Leonard Nimoy as Mr. Spock Better parting line would've been: "Serve God and live." pic.twitter.com/YQ1M51y4oq. — Westboro Baptist (@WBCSaysRepent) February 28, 2015. While it's quite possible (read: absolutely clear) that the Church was picking on ...


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 ...
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Wed, 11 Feb 2015 10:08:35 -0800

In a familiar refrain about Kanye West heard in the days following Sunday's Grammy Awards, New England cornerback Brandon Browner decided to start singing along Tuesday night. Browner called West a “sucka” in the first of a series of tweets expressing ...

Paste Magazine

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Wed, 18 Feb 2015 08:31:57 -0800

The specter of death has a way of easing friction between people, though, so as Dooley prepares to breathe his last, he lets loose with one hell of a parting line before taking his hero's charge through the SSR's upper floor window. “Snafu” starts out ...


Wed, 11 Feb 2015 00:43:44 -0800

His quiet parting line, “Thank you for the light,” is one of the most powerful ones. Brian Baylor also performs well as Nora's husband, creating his own version of the obliviously condescending, over-confident and immature Torvald Helmer. His lines are ...

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Sat, 28 Feb 2015 02:11:08 -0800

The parting line has the element of a door being left slightly ajar, not slammed shut, potentially the thoughts of a group that will sit back and watch developments, maybe let some pressure build, hope for a knee jerk reaction and return to the table ...


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