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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]


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317 news items


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

When you are developing a 3D CAD model to be molded, you may not spend much time thinking about where its parting line will be, but it's worth noting as the location can affect your part in several ways. On some parts, the location for the parting line ...


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 ...


Wed, 26 Nov 2014 18:03:45 -0800

Once the fighting is over, Batman tries to get Hush back verbally by saying he is a little boy crying, but for me there was a previous line that I thought should have cut Hush more deeply, and would have been a better parting line for Batman to have ...


Wed, 03 Dec 2014 15:03:45 -0800

Vertical parting of moulds enables placement of the gating system, as well as venting of the mould cavities, in the parting line. Other systems or sources of disturbance such as venting and drilling devices are not necessary. Production normally ...
Digital Journal
Mon, 01 Dec 2014 13:56:15 -0800

SelfLube, the leading U.S. manufacturer for precision mold and die components announces a major expansion in manufacturing operations in Coopersville, MI. In 2015 the Company will be adding machines, employees and manufacturing space.
Today's Zaman
Wed, 17 Sep 2014 09:18:45 -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 ...

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.

Consequence of Sound

Consequence of Sound
Thu, 11 Sep 2014 21:01:01 -0700

And how you respond to Goodwin's parting line depends on whether or not you see him as the hero. It's easy to accept him as such: he's young, handsome, and presented as a morally sound individual with big dreams. I, however, do not see Dick Goodwin as ...

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