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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]

References[edit]



Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Parting_line — Please support Wikipedia.
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Updated - Mold Making Casting Complex Parts w/ parting line)

When mass casting a part without a flat side, you must create a two-part mold. We create a two-part silicone rubber mold with a clean parting line and then c...

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How to create a parting line

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5 news items

 
Zimbio
Wed, 29 Oct 2014 11:56:15 -0700

The Blind Man's parting line, "I was gonna make espresso" was not in the script, but was ad-libbed by Gene Hackman during shooting. This is the reason for the immediate fade to black in the movie, as the crew reportedly erupted into fits of laughter. 16.
 
PR Web (press release)
Sat, 25 Oct 2014 21:43:07 -0700

Coopersville, MI (PRWEB) October 28, 2014. SelfLube the leading U.S. manufacturer of precision mold and die components, will be displaying its product line of wear plates, wear strips, gibs, bushings, parting line locks and many others, at the Fabtech ...

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.

Metro.us

Metro.us
Wed, 08 Oct 2014 15:18:39 -0700

Andrew Lincoln certainly made it seem that Rick will be a force to be reckoned with when he delivered his parting line: "They're screwing with the wrong people." Beth Back in Action: The last trace we saw of Beth (Emily Kinney) was when Daryl (Norman ...

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 ...
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