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A parting line 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]


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7 news items

Herald Scotland
Tue, 21 Oct 2014 19:03:45 -0700

As the pale parting-line in hair. Across the heath. And thoughtful men. Contrast its days of Now and Then,. And delve, and measure, and compare;. Loading article content. Visioning on the vacant air. Helmed legionaries, who proudly rear. The Eagle, as ...

Wall Street Journal (blog)

Wall Street Journal (blog)
Fri, 17 Oct 2014 16:25:44 -0700

All week leading up to Thursday night's episode of “How To Get Away With Murder,” ABC beat the promotional drum by promising fans, “your jaw will hit the floor with Viola Davis's last nine words.” In fact, her character's parting line lived up to the hype.

The New Indian Express

The New Indian Express
Sat, 18 Oct 2014 17:33:45 -0700

It came down from the Germans, the word Blitzkrieg. Twice in a row, Chennai got a glimpse of the Shah Rukh Khan blitzkrieg—close to 50 interviews and more than 7 press conferences—promoting along with his team members, Deepika Padukone, Abhishek ...


Tue, 23 Sep 2014 10:15:00 -0700

He got a redemption arc last season that did not hinge whatsoever on Abbie reciprocating his feelings, which was great, and even makes his parting line seem less like creeping than like an apology. (And really, "You remind me that I am human" is a ...


Mon, 29 Sep 2014 07:26:15 -0700

Since this is for a two-part mold, you will need to consider where the parting line is, with this one having a center line between the front and the back. Once that's done, you'll need to either use your 3D printer to print out the original, or arrange ...
Wed, 08 Oct 2014 16:36:55 -0700

Logan Airport is not one of those airports but officials are still keeping a close eye on everyone flying in and out seven -- parting line here tonight with more on the steps there today. He had a heat -- nick not being one of the five airports chosen ...

Hot Rod Magazine (blog)

Hot Rod Magazine (blog)
Thu, 25 Sep 2014 17:56:53 -0700

The alloys are much stronger than a simple weld of two materials, because there isn't a single parting line where one material changes into the other, it's a much more gradual blending. The result is the ability to make things like a mount for optics ...

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