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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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Learn how to use mold tools for SOLIDWORKS from this 3 part series. This video describes how to create split lines and parting lines in preparation to creati...

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See how to create a parting line for plastic injection molds using the Solid Edge Mold Tooling application.

How to make a parting line

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Here's a novel mold process for those of you making 2 piece molds. This process delivers great, tight seams. Platsil 7325 is a great silicone to use for this...

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Updated - Simple Silicone Rubber Molds (no parting line)

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NX8 - 10 isocline parting line

Design Through Manufacturing co.,ltd. (DTM Thailand) www.dtm-thailand.com www.facebook.com/dtmth.

FOUNDRY WORK molding irregular parting line Part 6 video A tubalcain

Tubalcain shows how to make sand mold using a pattern with an irregular parting line. This is part A of a two part video. irregular parting part 6 video A.

proe creo mold cavity tutorial make parting line for cover plastic part

proe creo mold cavity tutorial make parting line for cover plastic part made by: hoi hoang viet-mechvn.org.

253858 videos foundNext > 

35 news items

Design ENGINEERING

Design ENGINEERING
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 ...
 
New Hampshire Public Radio
Thu, 18 Sep 2014 11:45:00 -0700

We spoke to the Currier Museum of Art's Senior Educator, Jane Oneail about the M.C. Escher retrospective that opens September 20th on the show today and in the process of prepping for that interview we discovered a few things about M.C. Escher that you ...
 
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 ...
 
Cihan News Agency
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 ...

Modern Times Magazine

Modern Times Magazine
Mon, 15 Sep 2014 14:33:45 -0700

Even Rhett's parting line to Scarlett in the scene that ends the movie: “Frankly, my dear, I don't give a damn!” has permeated the pop-culture zeitgeist; it was voted the number one movie line of all time by the American Film Institute in 2005. One ...

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 ...

Core77.com (blog)

Core77.com (blog)
Wed, 10 Sep 2014 10:22:41 -0700

It all seemed so obvious to us, if you make that part out of plastic rather than metal it will break, or that button shouldn't be there or it is accidentally going to get pressed every other time, or the parting line here is going to bite into the user ...

Flickering Myth (blog)

Flickering Myth (blog)
Thu, 11 Sep 2014 10:20:18 -0700

... and to have no moral lesson to teach its young audience, the 1939 film introduced symbolism that has become inextricably linked with the story, by casting Dorothy's family and neighbours as the iconic friends and enemies she makes in Oz. Her ...
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