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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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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 cast the part with Repro.

SOLIDWORKS - Mold Tools Part 2 - Split Line and Parting Line

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 creating parting surfaces. Quick Tip...

How to mold a pattern with two parting lines

E7 SolidWorks finding a complex parting line

Exercise 7 - Explores how to create a silhouette parting line off a complex (non-planar) part.

Mold Making with Silicone: 2 piece mold with alginate parting line

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 molding process since it is VERY...

SolidWorks 2013 Tutorial | Parting Line Draft

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Exercise 5 - Explores SolidWorks Mold tools when used with a non-planar parting line.

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Ideal for smaller projects (less than 12" x 12"), this is the easiest process for creating parts, patterns, tools, & molds. We demonstrate creating a silicone rubber mold and then the casting...

SolidWorks Tutorial -18(Parting Line Command)

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431 news items

The Hindu

The Hindu
Fri, 01 May 2015 03:39:02 -0700

Hindi film fans, meanwhile, are doing dubsmash videos with dialogues of Sonam Kapoor from Ayesha, Kareena Kapoor in Jab We Met, Alia Bhatt in 2 States; Amrish Puri's parting line to Kajol in Dilwale Dulhaniya Le Jayenge: 'Ja Simran ja, jee le apni ...
Comic Book Resources
Thu, 30 Apr 2015 13:51:44 -0700

Cowles racks up some classic sound effects and gives readers the best parting line they could hope for from Benjamin J. Grimm. A four-page tale, drawn in Pascal Campion's whimsical style that would be as well-suited for a Golden Book as it is for this ...

New York Observer

New York Observer
Tue, 28 Apr 2015 14:56:15 -0700

and that turns out to be his parting line.” As faerie tradition, mainly rooted in British Celtic folklore, tells it, it's also customary to leave offerings to show your desire to interact. “Glitter and sugar are their drugs of choice,” said Ms. Stover ...

Plastics Technology

Plastics Technology
Tue, 28 Apr 2015 07:26:15 -0700

“We're cutting IBM cycle times by around half, so we need fast-cooling aluminum molds. But aluminum tends to be soft, which leads to parting-line wear and visual defects in bottles. Unfortunately, pharma customers are used to perfect parting lines from ...


Mon, 27 Apr 2015 07:52:40 -0700

THE GOOD WIFE said goodbye to Archie Panjabi as Kalinda Sharma during the episode “Deconstruction” and it was like a sneak attack. We had been tied up in the devastation of Alicia as she withdrew from the State's Attorney race and then the almost ...


Thu, 23 Apr 2015 08:15:27 -0700

(Newser) – Robert Downey Jr. thought he was doing an interview to promote Avengers: Age of Ultron, and for almost four minutes, he was. But when Krishnan Guru-Murthy of Britain's Channel 4 started getting personal yesterday, RDJ wasn't happy—and ...


Mon, 27 Apr 2015 11:11:15 -0700

Arm yourself with a pintail comb (or just use the end of a pencil) to create a perfectly straight parting line. 2. Slide a straightening or smoothing serum from your mid-lengths to ends to combat flyaways and gain some control. 3. Pull hair low and ...

Business Insider

Business Insider
Mon, 06 Apr 2015 06:17:59 -0700

Almost 11 months after “Mad Men” paused it's final season, the show finally returned last night with the first of its final episodes. After Don Draper (Jon Hamm) and his actress-wife Megan (Jessica Paré) decided to end their marriage in the last ...

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